License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 21:07:57 +07:00
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// SPDX-License-Identifier: GPL-2.0
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2008-01-25 04:13:08 +07:00
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <linux/bio.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/page-flags.h>
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/swap.h>
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#include <linux/writeback.h>
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#include <linux/pagevec.h>
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2011-05-21 02:50:29 +07:00
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#include <linux/prefetch.h>
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2011-05-26 23:01:56 +07:00
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#include <linux/cleancache.h>
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2008-01-25 04:13:08 +07:00
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#include "extent_io.h"
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#include "extent_map.h"
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2008-08-20 19:51:49 +07:00
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#include "ctree.h"
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#include "btrfs_inode.h"
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2011-07-22 20:41:52 +07:00
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#include "volumes.h"
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2011-11-09 19:44:05 +07:00
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#include "check-integrity.h"
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2012-03-13 20:38:00 +07:00
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#include "locking.h"
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2012-06-05 01:03:51 +07:00
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#include "rcu-string.h"
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2013-09-22 11:54:23 +07:00
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#include "backref.h"
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2008-01-25 04:13:08 +07:00
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static struct kmem_cache *extent_state_cache;
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static struct kmem_cache *extent_buffer_cache;
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2013-05-18 05:30:14 +07:00
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static struct bio_set *btrfs_bioset;
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2008-01-25 04:13:08 +07:00
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2014-07-07 02:09:59 +07:00
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static inline bool extent_state_in_tree(const struct extent_state *state)
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{
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return !RB_EMPTY_NODE(&state->rb_node);
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}
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2013-04-22 23:12:31 +07:00
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#ifdef CONFIG_BTRFS_DEBUG
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2008-01-25 04:13:08 +07:00
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static LIST_HEAD(buffers);
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static LIST_HEAD(states);
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2008-09-08 22:18:08 +07:00
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2009-01-06 09:25:51 +07:00
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static DEFINE_SPINLOCK(leak_lock);
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2013-04-22 23:12:31 +07:00
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static inline
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void btrfs_leak_debug_add(struct list_head *new, struct list_head *head)
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{
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unsigned long flags;
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spin_lock_irqsave(&leak_lock, flags);
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list_add(new, head);
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spin_unlock_irqrestore(&leak_lock, flags);
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}
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static inline
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void btrfs_leak_debug_del(struct list_head *entry)
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{
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unsigned long flags;
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spin_lock_irqsave(&leak_lock, flags);
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list_del(entry);
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spin_unlock_irqrestore(&leak_lock, flags);
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}
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static inline
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void btrfs_leak_debug_check(void)
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{
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struct extent_state *state;
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struct extent_buffer *eb;
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while (!list_empty(&states)) {
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state = list_entry(states.next, struct extent_state, leak_list);
|
2015-01-15 01:52:13 +07:00
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pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n",
|
2014-07-07 02:09:59 +07:00
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state->start, state->end, state->state,
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extent_state_in_tree(state),
|
2017-03-03 15:55:19 +07:00
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refcount_read(&state->refs));
|
2013-04-22 23:12:31 +07:00
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list_del(&state->leak_list);
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kmem_cache_free(extent_state_cache, state);
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}
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while (!list_empty(&buffers)) {
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eb = list_entry(buffers.next, struct extent_buffer, leak_list);
|
2016-09-20 21:05:01 +07:00
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pr_err("BTRFS: buffer leak start %llu len %lu refs %d\n",
|
2013-08-20 18:20:07 +07:00
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eb->start, eb->len, atomic_read(&eb->refs));
|
2013-04-22 23:12:31 +07:00
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list_del(&eb->leak_list);
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kmem_cache_free(extent_buffer_cache, eb);
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}
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}
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2013-04-30 22:22:23 +07:00
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2013-12-13 22:02:44 +07:00
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#define btrfs_debug_check_extent_io_range(tree, start, end) \
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__btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end))
|
2013-04-30 22:22:23 +07:00
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static inline void __btrfs_debug_check_extent_io_range(const char *caller,
|
2013-12-13 22:02:44 +07:00
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struct extent_io_tree *tree, u64 start, u64 end)
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2013-04-30 22:22:23 +07:00
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{
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2017-05-05 22:57:13 +07:00
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if (tree->ops && tree->ops->check_extent_io_range)
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tree->ops->check_extent_io_range(tree->private_data, caller,
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start, end);
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2013-04-30 22:22:23 +07:00
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}
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2013-04-22 23:12:31 +07:00
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#else
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#define btrfs_leak_debug_add(new, head) do {} while (0)
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#define btrfs_leak_debug_del(entry) do {} while (0)
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#define btrfs_leak_debug_check() do {} while (0)
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2013-04-30 22:22:23 +07:00
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#define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0)
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2008-09-08 22:18:08 +07:00
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#endif
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2008-01-25 04:13:08 +07:00
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#define BUFFER_LRU_MAX 64
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struct tree_entry {
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u64 start;
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u64 end;
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struct rb_node rb_node;
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};
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struct extent_page_data {
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struct bio *bio;
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struct extent_io_tree *tree;
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get_extent_t *get_extent;
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2008-11-07 10:02:51 +07:00
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/* tells writepage not to lock the state bits for this range
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* it still does the unlocking
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*/
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2009-04-21 02:50:09 +07:00
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unsigned int extent_locked:1;
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2016-11-01 20:40:10 +07:00
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/* tells the submit_bio code to use REQ_SYNC */
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2009-04-21 02:50:09 +07:00
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unsigned int sync_io:1;
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2008-01-25 04:13:08 +07:00
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};
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2015-10-12 13:53:37 +07:00
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static void add_extent_changeset(struct extent_state *state, unsigned bits,
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struct extent_changeset *changeset,
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int set)
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{
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int ret;
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if (!changeset)
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return;
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if (set && (state->state & bits) == bits)
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return;
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2015-10-12 14:35:38 +07:00
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if (!set && (state->state & bits) == 0)
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return;
|
2015-10-12 13:53:37 +07:00
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changeset->bytes_changed += state->end - state->start + 1;
|
2017-02-13 19:42:29 +07:00
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ret = ulist_add(&changeset->range_changed, state->start, state->end,
|
2015-10-12 13:53:37 +07:00
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GFP_ATOMIC);
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/* ENOMEM */
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BUG_ON(ret < 0);
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}
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2012-03-13 20:38:00 +07:00
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static noinline void flush_write_bio(void *data);
|
2011-10-04 10:22:32 +07:00
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static inline struct btrfs_fs_info *
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tree_fs_info(struct extent_io_tree *tree)
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{
|
2017-05-05 22:57:13 +07:00
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if (tree->ops)
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return tree->ops->tree_fs_info(tree->private_data);
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return NULL;
|
2011-10-04 10:22:32 +07:00
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}
|
2012-03-13 20:38:00 +07:00
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2008-01-25 04:13:08 +07:00
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int __init extent_io_init(void)
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{
|
2012-09-07 16:00:48 +07:00
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extent_state_cache = kmem_cache_create("btrfs_extent_state",
|
2009-04-13 20:33:09 +07:00
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sizeof(struct extent_state), 0,
|
2016-06-24 01:17:08 +07:00
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SLAB_MEM_SPREAD, NULL);
|
2008-01-25 04:13:08 +07:00
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if (!extent_state_cache)
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return -ENOMEM;
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|
2012-09-07 16:00:48 +07:00
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extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer",
|
2009-04-13 20:33:09 +07:00
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sizeof(struct extent_buffer), 0,
|
2016-06-24 01:17:08 +07:00
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SLAB_MEM_SPREAD, NULL);
|
2008-01-25 04:13:08 +07:00
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if (!extent_buffer_cache)
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goto free_state_cache;
|
2013-05-18 05:30:14 +07:00
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|
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|
|
btrfs_bioset = bioset_create(BIO_POOL_SIZE,
|
2017-06-18 11:38:57 +07:00
|
|
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offsetof(struct btrfs_io_bio, bio),
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BIOSET_NEED_BVECS);
|
2013-05-18 05:30:14 +07:00
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if (!btrfs_bioset)
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goto free_buffer_cache;
|
2013-09-20 10:37:07 +07:00
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if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE))
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goto free_bioset;
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|
2008-01-25 04:13:08 +07:00
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return 0;
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2013-09-20 10:37:07 +07:00
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free_bioset:
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bioset_free(btrfs_bioset);
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btrfs_bioset = NULL;
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2013-05-18 05:30:14 +07:00
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free_buffer_cache:
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kmem_cache_destroy(extent_buffer_cache);
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extent_buffer_cache = NULL;
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2008-01-25 04:13:08 +07:00
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free_state_cache:
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kmem_cache_destroy(extent_state_cache);
|
2013-05-18 05:30:14 +07:00
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extent_state_cache = NULL;
|
2008-01-25 04:13:08 +07:00
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return -ENOMEM;
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}
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void extent_io_exit(void)
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{
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2013-04-22 23:12:31 +07:00
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btrfs_leak_debug_check();
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2012-09-26 08:33:07 +07:00
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/*
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* Make sure all delayed rcu free are flushed before we
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* destroy caches.
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*/
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rcu_barrier();
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2016-01-29 20:36:35 +07:00
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kmem_cache_destroy(extent_state_cache);
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kmem_cache_destroy(extent_buffer_cache);
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2013-05-18 05:30:14 +07:00
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if (btrfs_bioset)
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bioset_free(btrfs_bioset);
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2008-01-25 04:13:08 +07:00
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}
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void extent_io_tree_init(struct extent_io_tree *tree,
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2017-05-05 22:57:13 +07:00
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void *private_data)
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2008-01-25 04:13:08 +07:00
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{
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2010-02-24 02:43:04 +07:00
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tree->state = RB_ROOT;
|
2008-01-25 04:13:08 +07:00
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tree->ops = NULL;
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tree->dirty_bytes = 0;
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2008-01-29 21:59:12 +07:00
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spin_lock_init(&tree->lock);
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2017-05-05 22:57:13 +07:00
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tree->private_data = private_data;
|
2008-01-25 04:13:08 +07:00
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}
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2008-12-02 21:54:17 +07:00
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static struct extent_state *alloc_extent_state(gfp_t mask)
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2008-01-25 04:13:08 +07:00
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{
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struct extent_state *state;
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|
|
|
2017-01-09 21:39:02 +07:00
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/*
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* The given mask might be not appropriate for the slab allocator,
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* drop the unsupported bits
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*/
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mask &= ~(__GFP_DMA32|__GFP_HIGHMEM);
|
2008-01-25 04:13:08 +07:00
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state = kmem_cache_alloc(extent_state_cache, mask);
|
2008-04-01 22:21:40 +07:00
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if (!state)
|
2008-01-25 04:13:08 +07:00
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return state;
|
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|
|
state->state = 0;
|
2016-02-11 19:24:13 +07:00
|
|
|
state->failrec = NULL;
|
2014-07-07 02:09:59 +07:00
|
|
|
RB_CLEAR_NODE(&state->rb_node);
|
2013-04-22 23:12:31 +07:00
|
|
|
btrfs_leak_debug_add(&state->leak_list, &states);
|
2017-03-03 15:55:19 +07:00
|
|
|
refcount_set(&state->refs, 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
init_waitqueue_head(&state->wq);
|
2012-03-01 20:56:26 +07:00
|
|
|
trace_alloc_extent_state(state, mask, _RET_IP_);
|
2008-01-25 04:13:08 +07:00
|
|
|
return state;
|
|
|
|
}
|
|
|
|
|
2010-05-26 07:56:50 +07:00
|
|
|
void free_extent_state(struct extent_state *state)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
if (!state)
|
|
|
|
return;
|
2017-03-03 15:55:19 +07:00
|
|
|
if (refcount_dec_and_test(&state->refs)) {
|
2014-07-07 02:09:59 +07:00
|
|
|
WARN_ON(extent_state_in_tree(state));
|
2013-04-22 23:12:31 +07:00
|
|
|
btrfs_leak_debug_del(&state->leak_list);
|
2012-03-01 20:56:26 +07:00
|
|
|
trace_free_extent_state(state, _RET_IP_);
|
2008-01-25 04:13:08 +07:00
|
|
|
kmem_cache_free(extent_state_cache, state);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-02-12 22:05:53 +07:00
|
|
|
static struct rb_node *tree_insert(struct rb_root *root,
|
|
|
|
struct rb_node *search_start,
|
|
|
|
u64 offset,
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node *node,
|
|
|
|
struct rb_node ***p_in,
|
|
|
|
struct rb_node **parent_in)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2014-02-12 22:05:53 +07:00
|
|
|
struct rb_node **p;
|
2009-01-06 09:25:51 +07:00
|
|
|
struct rb_node *parent = NULL;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct tree_entry *entry;
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
if (p_in && parent_in) {
|
|
|
|
p = *p_in;
|
|
|
|
parent = *parent_in;
|
|
|
|
goto do_insert;
|
|
|
|
}
|
|
|
|
|
2014-02-12 22:05:53 +07:00
|
|
|
p = search_start ? &search_start : &root->rb_node;
|
2009-01-06 09:25:51 +07:00
|
|
|
while (*p) {
|
2008-01-25 04:13:08 +07:00
|
|
|
parent = *p;
|
|
|
|
entry = rb_entry(parent, struct tree_entry, rb_node);
|
|
|
|
|
|
|
|
if (offset < entry->start)
|
|
|
|
p = &(*p)->rb_left;
|
|
|
|
else if (offset > entry->end)
|
|
|
|
p = &(*p)->rb_right;
|
|
|
|
else
|
|
|
|
return parent;
|
|
|
|
}
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
do_insert:
|
2008-01-25 04:13:08 +07:00
|
|
|
rb_link_node(node, parent, p);
|
|
|
|
rb_insert_color(node, root);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2008-02-02 02:51:59 +07:00
|
|
|
static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset,
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node **prev_ret,
|
|
|
|
struct rb_node **next_ret,
|
|
|
|
struct rb_node ***p_ret,
|
|
|
|
struct rb_node **parent_ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2008-02-02 02:51:59 +07:00
|
|
|
struct rb_root *root = &tree->state;
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node **n = &root->rb_node;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct rb_node *prev = NULL;
|
|
|
|
struct rb_node *orig_prev = NULL;
|
|
|
|
struct tree_entry *entry;
|
|
|
|
struct tree_entry *prev_entry = NULL;
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
while (*n) {
|
|
|
|
prev = *n;
|
|
|
|
entry = rb_entry(prev, struct tree_entry, rb_node);
|
2008-01-25 04:13:08 +07:00
|
|
|
prev_entry = entry;
|
|
|
|
|
|
|
|
if (offset < entry->start)
|
2013-11-26 22:41:47 +07:00
|
|
|
n = &(*n)->rb_left;
|
2008-01-25 04:13:08 +07:00
|
|
|
else if (offset > entry->end)
|
2013-11-26 22:41:47 +07:00
|
|
|
n = &(*n)->rb_right;
|
2009-01-06 09:25:51 +07:00
|
|
|
else
|
2013-11-26 22:41:47 +07:00
|
|
|
return *n;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
if (p_ret)
|
|
|
|
*p_ret = n;
|
|
|
|
if (parent_ret)
|
|
|
|
*parent_ret = prev;
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
if (prev_ret) {
|
|
|
|
orig_prev = prev;
|
2009-01-06 09:25:51 +07:00
|
|
|
while (prev && offset > prev_entry->end) {
|
2008-01-25 04:13:08 +07:00
|
|
|
prev = rb_next(prev);
|
|
|
|
prev_entry = rb_entry(prev, struct tree_entry, rb_node);
|
|
|
|
}
|
|
|
|
*prev_ret = prev;
|
|
|
|
prev = orig_prev;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (next_ret) {
|
|
|
|
prev_entry = rb_entry(prev, struct tree_entry, rb_node);
|
2009-01-06 09:25:51 +07:00
|
|
|
while (prev && offset < prev_entry->start) {
|
2008-01-25 04:13:08 +07:00
|
|
|
prev = rb_prev(prev);
|
|
|
|
prev_entry = rb_entry(prev, struct tree_entry, rb_node);
|
|
|
|
}
|
|
|
|
*next_ret = prev;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
static inline struct rb_node *
|
|
|
|
tree_search_for_insert(struct extent_io_tree *tree,
|
|
|
|
u64 offset,
|
|
|
|
struct rb_node ***p_ret,
|
|
|
|
struct rb_node **parent_ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2008-01-29 21:59:12 +07:00
|
|
|
struct rb_node *prev = NULL;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct rb_node *ret;
|
2008-01-29 21:59:12 +07:00
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret);
|
2009-01-06 09:25:51 +07:00
|
|
|
if (!ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
return prev;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-11-26 22:41:47 +07:00
|
|
|
static inline struct rb_node *tree_search(struct extent_io_tree *tree,
|
|
|
|
u64 offset)
|
|
|
|
{
|
|
|
|
return tree_search_for_insert(tree, offset, NULL, NULL);
|
|
|
|
}
|
|
|
|
|
2009-09-12 03:12:44 +07:00
|
|
|
static void merge_cb(struct extent_io_tree *tree, struct extent_state *new,
|
|
|
|
struct extent_state *other)
|
|
|
|
{
|
|
|
|
if (tree->ops && tree->ops->merge_extent_hook)
|
2017-05-05 22:57:13 +07:00
|
|
|
tree->ops->merge_extent_hook(tree->private_data, new, other);
|
2009-09-12 03:12:44 +07:00
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* utility function to look for merge candidates inside a given range.
|
|
|
|
* Any extents with matching state are merged together into a single
|
|
|
|
* extent in the tree. Extents with EXTENT_IO in their state field
|
|
|
|
* are not merged because the end_io handlers need to be able to do
|
|
|
|
* operations on them without sleeping (or doing allocations/splits).
|
|
|
|
*
|
|
|
|
* This should be called with the tree lock held.
|
|
|
|
*/
|
2011-07-21 23:56:09 +07:00
|
|
|
static void merge_state(struct extent_io_tree *tree,
|
|
|
|
struct extent_state *state)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_state *other;
|
|
|
|
struct rb_node *other_node;
|
|
|
|
|
2008-09-26 21:05:38 +07:00
|
|
|
if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY))
|
2011-07-21 23:56:09 +07:00
|
|
|
return;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
other_node = rb_prev(&state->rb_node);
|
|
|
|
if (other_node) {
|
|
|
|
other = rb_entry(other_node, struct extent_state, rb_node);
|
|
|
|
if (other->end == state->start - 1 &&
|
|
|
|
other->state == state->state) {
|
2009-09-12 03:12:44 +07:00
|
|
|
merge_cb(tree, state, other);
|
2008-01-25 04:13:08 +07:00
|
|
|
state->start = other->start;
|
|
|
|
rb_erase(&other->rb_node, &tree->state);
|
2014-07-07 02:09:59 +07:00
|
|
|
RB_CLEAR_NODE(&other->rb_node);
|
2008-01-25 04:13:08 +07:00
|
|
|
free_extent_state(other);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
other_node = rb_next(&state->rb_node);
|
|
|
|
if (other_node) {
|
|
|
|
other = rb_entry(other_node, struct extent_state, rb_node);
|
|
|
|
if (other->start == state->end + 1 &&
|
|
|
|
other->state == state->state) {
|
2009-09-12 03:12:44 +07:00
|
|
|
merge_cb(tree, state, other);
|
2011-06-21 01:53:48 +07:00
|
|
|
state->end = other->end;
|
|
|
|
rb_erase(&other->rb_node, &tree->state);
|
2014-07-07 02:09:59 +07:00
|
|
|
RB_CLEAR_NODE(&other->rb_node);
|
2011-06-21 01:53:48 +07:00
|
|
|
free_extent_state(other);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-07-21 23:56:09 +07:00
|
|
|
static void set_state_cb(struct extent_io_tree *tree,
|
2015-01-15 01:52:13 +07:00
|
|
|
struct extent_state *state, unsigned *bits)
|
2008-01-30 03:55:23 +07:00
|
|
|
{
|
2011-07-21 23:56:09 +07:00
|
|
|
if (tree->ops && tree->ops->set_bit_hook)
|
2017-05-05 22:57:13 +07:00
|
|
|
tree->ops->set_bit_hook(tree->private_data, state, bits);
|
2008-01-30 03:55:23 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void clear_state_cb(struct extent_io_tree *tree,
|
2015-01-15 01:52:13 +07:00
|
|
|
struct extent_state *state, unsigned *bits)
|
2008-01-30 03:55:23 +07:00
|
|
|
{
|
2009-09-12 03:12:44 +07:00
|
|
|
if (tree->ops && tree->ops->clear_bit_hook)
|
2017-05-05 22:57:13 +07:00
|
|
|
tree->ops->clear_bit_hook(tree->private_data, state, bits);
|
2008-01-30 03:55:23 +07:00
|
|
|
}
|
|
|
|
|
2011-07-14 10:19:08 +07:00
|
|
|
static void set_state_bits(struct extent_io_tree *tree,
|
2015-10-12 13:53:37 +07:00
|
|
|
struct extent_state *state, unsigned *bits,
|
|
|
|
struct extent_changeset *changeset);
|
2011-07-14 10:19:08 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* insert an extent_state struct into the tree. 'bits' are set on the
|
|
|
|
* struct before it is inserted.
|
|
|
|
*
|
|
|
|
* This may return -EEXIST if the extent is already there, in which case the
|
|
|
|
* state struct is freed.
|
|
|
|
*
|
|
|
|
* The tree lock is not taken internally. This is a utility function and
|
|
|
|
* probably isn't what you want to call (see set/clear_extent_bit).
|
|
|
|
*/
|
|
|
|
static int insert_state(struct extent_io_tree *tree,
|
|
|
|
struct extent_state *state, u64 start, u64 end,
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node ***p,
|
|
|
|
struct rb_node **parent,
|
2015-10-12 13:53:37 +07:00
|
|
|
unsigned *bits, struct extent_changeset *changeset)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
|
2012-11-03 17:58:34 +07:00
|
|
|
if (end < start)
|
2013-12-20 23:37:06 +07:00
|
|
|
WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n",
|
2013-08-20 18:20:07 +07:00
|
|
|
end, start);
|
2008-01-25 04:13:08 +07:00
|
|
|
state->start = start;
|
|
|
|
state->end = end;
|
2009-09-12 03:12:44 +07:00
|
|
|
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, state, bits, changeset);
|
2011-07-14 10:19:08 +07:00
|
|
|
|
2014-02-12 22:05:53 +07:00
|
|
|
node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (node) {
|
|
|
|
struct extent_state *found;
|
|
|
|
found = rb_entry(node, struct extent_state, rb_node);
|
2016-09-20 21:05:01 +07:00
|
|
|
pr_err("BTRFS: found node %llu %llu on insert of %llu %llu\n",
|
2013-08-20 18:20:07 +07:00
|
|
|
found->start, found->end, start, end);
|
2008-01-25 04:13:08 +07:00
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
merge_state(tree, state);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-07-21 23:56:09 +07:00
|
|
|
static void split_cb(struct extent_io_tree *tree, struct extent_state *orig,
|
2009-09-12 03:12:44 +07:00
|
|
|
u64 split)
|
|
|
|
{
|
|
|
|
if (tree->ops && tree->ops->split_extent_hook)
|
2017-05-05 22:57:13 +07:00
|
|
|
tree->ops->split_extent_hook(tree->private_data, orig, split);
|
2009-09-12 03:12:44 +07:00
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* split a given extent state struct in two, inserting the preallocated
|
|
|
|
* struct 'prealloc' as the newly created second half. 'split' indicates an
|
|
|
|
* offset inside 'orig' where it should be split.
|
|
|
|
*
|
|
|
|
* Before calling,
|
|
|
|
* the tree has 'orig' at [orig->start, orig->end]. After calling, there
|
|
|
|
* are two extent state structs in the tree:
|
|
|
|
* prealloc: [orig->start, split - 1]
|
|
|
|
* orig: [ split, orig->end ]
|
|
|
|
*
|
|
|
|
* The tree locks are not taken by this function. They need to be held
|
|
|
|
* by the caller.
|
|
|
|
*/
|
|
|
|
static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
|
|
|
|
struct extent_state *prealloc, u64 split)
|
|
|
|
{
|
|
|
|
struct rb_node *node;
|
2009-09-12 03:12:44 +07:00
|
|
|
|
|
|
|
split_cb(tree, orig, split);
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc->start = orig->start;
|
|
|
|
prealloc->end = split - 1;
|
|
|
|
prealloc->state = orig->state;
|
|
|
|
orig->start = split;
|
|
|
|
|
2014-02-12 22:05:53 +07:00
|
|
|
node = tree_insert(&tree->state, &orig->rb_node, prealloc->end,
|
|
|
|
&prealloc->rb_node, NULL, NULL);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (node) {
|
|
|
|
free_extent_state(prealloc);
|
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-03-12 15:39:48 +07:00
|
|
|
static struct extent_state *next_state(struct extent_state *state)
|
|
|
|
{
|
|
|
|
struct rb_node *next = rb_next(&state->rb_node);
|
|
|
|
if (next)
|
|
|
|
return rb_entry(next, struct extent_state, rb_node);
|
|
|
|
else
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* utility function to clear some bits in an extent state struct.
|
2012-04-06 13:35:18 +07:00
|
|
|
* it will optionally wake up any one waiting on this state (wake == 1).
|
2008-01-25 04:13:08 +07:00
|
|
|
*
|
|
|
|
* If no bits are set on the state struct after clearing things, the
|
|
|
|
* struct is freed and removed from the tree
|
|
|
|
*/
|
2012-03-12 15:39:48 +07:00
|
|
|
static struct extent_state *clear_state_bit(struct extent_io_tree *tree,
|
|
|
|
struct extent_state *state,
|
2015-10-12 14:35:38 +07:00
|
|
|
unsigned *bits, int wake,
|
|
|
|
struct extent_changeset *changeset)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2012-03-12 15:39:48 +07:00
|
|
|
struct extent_state *next;
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2010-05-16 21:48:47 +07:00
|
|
|
if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) {
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 range = state->end - state->start + 1;
|
|
|
|
WARN_ON(range > tree->dirty_bytes);
|
|
|
|
tree->dirty_bytes -= range;
|
|
|
|
}
|
2008-01-30 03:55:23 +07:00
|
|
|
clear_state_cb(tree, state, bits);
|
2015-10-12 14:35:38 +07:00
|
|
|
add_extent_changeset(state, bits_to_clear, changeset, 0);
|
2009-10-09 00:34:05 +07:00
|
|
|
state->state &= ~bits_to_clear;
|
2008-01-25 04:13:08 +07:00
|
|
|
if (wake)
|
|
|
|
wake_up(&state->wq);
|
2010-05-16 21:48:47 +07:00
|
|
|
if (state->state == 0) {
|
2012-03-12 15:39:48 +07:00
|
|
|
next = next_state(state);
|
2014-07-07 02:09:59 +07:00
|
|
|
if (extent_state_in_tree(state)) {
|
2008-01-25 04:13:08 +07:00
|
|
|
rb_erase(&state->rb_node, &tree->state);
|
2014-07-07 02:09:59 +07:00
|
|
|
RB_CLEAR_NODE(&state->rb_node);
|
2008-01-25 04:13:08 +07:00
|
|
|
free_extent_state(state);
|
|
|
|
} else {
|
|
|
|
WARN_ON(1);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
merge_state(tree, state);
|
2012-03-12 15:39:48 +07:00
|
|
|
next = next_state(state);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2012-03-12 15:39:48 +07:00
|
|
|
return next;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2011-04-20 13:44:57 +07:00
|
|
|
static struct extent_state *
|
|
|
|
alloc_extent_state_atomic(struct extent_state *prealloc)
|
|
|
|
{
|
|
|
|
if (!prealloc)
|
|
|
|
prealloc = alloc_extent_state(GFP_ATOMIC);
|
|
|
|
|
|
|
|
return prealloc;
|
|
|
|
}
|
|
|
|
|
2013-04-26 03:41:01 +07:00
|
|
|
static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
|
2011-10-04 10:22:32 +07:00
|
|
|
{
|
2016-09-20 21:05:00 +07:00
|
|
|
btrfs_panic(tree_fs_info(tree), err,
|
|
|
|
"Locking error: Extent tree was modified by another thread while locked.");
|
2011-10-04 10:22:32 +07:00
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* clear some bits on a range in the tree. This may require splitting
|
|
|
|
* or inserting elements in the tree, so the gfp mask is used to
|
|
|
|
* indicate which allocations or sleeping are allowed.
|
|
|
|
*
|
|
|
|
* pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove
|
|
|
|
* the given range from the tree regardless of state (ie for truncate).
|
|
|
|
*
|
|
|
|
* the range [start, end] is inclusive.
|
|
|
|
*
|
2012-03-01 20:56:29 +07:00
|
|
|
* This takes the tree lock, and returns 0 on success and < 0 on error.
|
2008-01-25 04:13:08 +07:00
|
|
|
*/
|
2015-10-12 14:35:38 +07:00
|
|
|
static int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
|
|
unsigned bits, int wake, int delete,
|
|
|
|
struct extent_state **cached_state,
|
|
|
|
gfp_t mask, struct extent_changeset *changeset)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state;
|
2009-09-03 02:04:12 +07:00
|
|
|
struct extent_state *cached;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct extent_state *prealloc = NULL;
|
|
|
|
struct rb_node *node;
|
2009-05-27 20:16:03 +07:00
|
|
|
u64 last_end;
|
2008-01-25 04:13:08 +07:00
|
|
|
int err;
|
2010-02-04 02:33:23 +07:00
|
|
|
int clear = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-12-13 22:02:44 +07:00
|
|
|
btrfs_debug_check_extent_io_range(tree, start, end);
|
2013-04-30 22:22:23 +07:00
|
|
|
|
2013-06-22 03:37:03 +07:00
|
|
|
if (bits & EXTENT_DELALLOC)
|
|
|
|
bits |= EXTENT_NORESERVE;
|
|
|
|
|
2010-05-16 21:48:47 +07:00
|
|
|
if (delete)
|
|
|
|
bits |= ~EXTENT_CTLBITS;
|
|
|
|
bits |= EXTENT_FIRST_DELALLOC;
|
|
|
|
|
2010-02-04 02:33:23 +07:00
|
|
|
if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY))
|
|
|
|
clear = 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
again:
|
2015-11-07 07:28:21 +07:00
|
|
|
if (!prealloc && gfpflags_allow_blocking(mask)) {
|
2014-11-03 21:12:57 +07:00
|
|
|
/*
|
|
|
|
* Don't care for allocation failure here because we might end
|
|
|
|
* up not needing the pre-allocated extent state at all, which
|
|
|
|
* is the case if we only have in the tree extent states that
|
|
|
|
* cover our input range and don't cover too any other range.
|
|
|
|
* If we end up needing a new extent state we allocate it later.
|
|
|
|
*/
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = alloc_extent_state(mask);
|
|
|
|
}
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2009-09-03 02:04:12 +07:00
|
|
|
if (cached_state) {
|
|
|
|
cached = *cached_state;
|
2010-02-04 02:33:23 +07:00
|
|
|
|
|
|
|
if (clear) {
|
|
|
|
*cached_state = NULL;
|
|
|
|
cached_state = NULL;
|
|
|
|
}
|
|
|
|
|
2014-07-07 02:09:59 +07:00
|
|
|
if (cached && extent_state_in_tree(cached) &&
|
|
|
|
cached->start <= start && cached->end > start) {
|
2010-02-04 02:33:23 +07:00
|
|
|
if (clear)
|
2017-03-03 15:55:19 +07:00
|
|
|
refcount_dec(&cached->refs);
|
2009-09-03 02:04:12 +07:00
|
|
|
state = cached;
|
2009-09-24 06:51:09 +07:00
|
|
|
goto hit_next;
|
2009-09-03 02:04:12 +07:00
|
|
|
}
|
2010-02-04 02:33:23 +07:00
|
|
|
if (clear)
|
|
|
|
free_extent_state(cached);
|
2009-09-03 02:04:12 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* this search will find the extents that end after
|
|
|
|
* our range starts
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, start);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!node)
|
|
|
|
goto out;
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
2009-09-03 02:04:12 +07:00
|
|
|
hit_next:
|
2008-01-25 04:13:08 +07:00
|
|
|
if (state->start > end)
|
|
|
|
goto out;
|
|
|
|
WARN_ON(state->end < start);
|
2009-05-27 20:16:03 +07:00
|
|
|
last_end = state->end;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2012-02-16 17:34:37 +07:00
|
|
|
/* the state doesn't have the wanted bits, go ahead */
|
2012-03-12 15:39:48 +07:00
|
|
|
if (!(state->state & bits)) {
|
|
|
|
state = next_state(state);
|
2012-02-16 17:34:37 +07:00
|
|
|
goto next;
|
2012-03-12 15:39:48 +07:00
|
|
|
}
|
2012-02-16 17:34:37 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state | or
|
|
|
|
* | ------------- state -------------- |
|
|
|
|
*
|
|
|
|
* We need to split the extent we found, and may flip
|
|
|
|
* bits on second half.
|
|
|
|
*
|
|
|
|
* If the extent we found extends past our range, we
|
|
|
|
* just split and search again. It'll get split again
|
|
|
|
* the next time though.
|
|
|
|
*
|
|
|
|
* If the extent we found is inside our range, we clear
|
|
|
|
* the desired bit on it.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (state->start < start) {
|
2011-04-20 13:44:57 +07:00
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2008-01-25 04:13:08 +07:00
|
|
|
err = split_state(tree, state, prealloc, start);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
if (state->end <= end) {
|
2015-10-12 14:35:38 +07:00
|
|
|
state = clear_state_bit(tree, state, &bits, wake,
|
|
|
|
changeset);
|
2012-05-10 17:10:39 +07:00
|
|
|
goto next;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
* We need to split the extent, and clear the bit
|
|
|
|
* on the first half
|
|
|
|
*/
|
|
|
|
if (state->start <= end && state->end > end) {
|
2011-04-20 13:44:57 +07:00
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2008-01-25 04:13:08 +07:00
|
|
|
err = split_state(tree, state, prealloc, end + 1);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
if (wake)
|
|
|
|
wake_up(&state->wq);
|
2009-09-24 06:51:09 +07:00
|
|
|
|
2015-10-12 14:35:38 +07:00
|
|
|
clear_state_bit(tree, prealloc, &bits, wake, changeset);
|
2009-09-12 03:12:44 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
2009-09-24 06:51:09 +07:00
|
|
|
|
2015-10-12 14:35:38 +07:00
|
|
|
state = clear_state_bit(tree, state, &bits, wake, changeset);
|
2012-02-16 17:34:37 +07:00
|
|
|
next:
|
2009-05-27 20:16:03 +07:00
|
|
|
if (last_end == (u64)-1)
|
|
|
|
goto out;
|
|
|
|
start = last_end + 1;
|
2012-03-12 15:39:48 +07:00
|
|
|
if (start <= end && state && !need_resched())
|
2012-02-16 17:34:36 +07:00
|
|
|
goto hit_next;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
search_again:
|
|
|
|
if (start > end)
|
|
|
|
goto out;
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2015-11-07 07:28:21 +07:00
|
|
|
if (gfpflags_allow_blocking(mask))
|
2008-01-25 04:13:08 +07:00
|
|
|
cond_resched();
|
|
|
|
goto again;
|
2016-04-27 06:02:15 +07:00
|
|
|
|
|
|
|
out:
|
|
|
|
spin_unlock(&tree->lock);
|
|
|
|
if (prealloc)
|
|
|
|
free_extent_state(prealloc);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2012-03-01 20:56:26 +07:00
|
|
|
static void wait_on_state(struct extent_io_tree *tree,
|
|
|
|
struct extent_state *state)
|
2008-12-02 18:36:10 +07:00
|
|
|
__releases(tree->lock)
|
|
|
|
__acquires(tree->lock)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE);
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
schedule();
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
finish_wait(&state->wq, &wait);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* waits for one or more bits to clear on a range in the state tree.
|
|
|
|
* The range [start, end] is inclusive.
|
|
|
|
* The tree lock is taken by this function
|
|
|
|
*/
|
2013-04-29 20:38:46 +07:00
|
|
|
static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
|
|
unsigned long bits)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state;
|
|
|
|
struct rb_node *node;
|
|
|
|
|
2013-12-13 22:02:44 +07:00
|
|
|
btrfs_debug_check_extent_io_range(tree, start, end);
|
2013-04-30 22:22:23 +07:00
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
again:
|
|
|
|
while (1) {
|
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, start);
|
2014-03-31 20:53:25 +07:00
|
|
|
process_node:
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!node)
|
|
|
|
break;
|
|
|
|
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
|
|
|
|
if (state->start > end)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (state->state & bits) {
|
|
|
|
start = state->start;
|
2017-03-03 15:55:19 +07:00
|
|
|
refcount_inc(&state->refs);
|
2008-01-25 04:13:08 +07:00
|
|
|
wait_on_state(tree, state);
|
|
|
|
free_extent_state(state);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
start = state->end + 1;
|
|
|
|
|
|
|
|
if (start > end)
|
|
|
|
break;
|
|
|
|
|
2014-03-31 20:53:25 +07:00
|
|
|
if (!cond_resched_lock(&tree->lock)) {
|
|
|
|
node = rb_next(node);
|
|
|
|
goto process_node;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2011-07-21 23:56:09 +07:00
|
|
|
static void set_state_bits(struct extent_io_tree *tree,
|
2008-01-25 04:13:08 +07:00
|
|
|
struct extent_state *state,
|
2015-10-12 13:53:37 +07:00
|
|
|
unsigned *bits, struct extent_changeset *changeset)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits_to_set = *bits & ~EXTENT_CTLBITS;
|
2009-09-12 03:12:44 +07:00
|
|
|
|
2011-07-21 23:56:09 +07:00
|
|
|
set_state_cb(tree, state, bits);
|
2010-05-16 21:48:47 +07:00
|
|
|
if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 range = state->end - state->start + 1;
|
|
|
|
tree->dirty_bytes += range;
|
|
|
|
}
|
2015-10-12 13:53:37 +07:00
|
|
|
add_extent_changeset(state, bits_to_set, changeset, 1);
|
2010-05-16 21:48:47 +07:00
|
|
|
state->state |= bits_to_set;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2014-10-13 18:28:38 +07:00
|
|
|
static void cache_state_if_flags(struct extent_state *state,
|
|
|
|
struct extent_state **cached_ptr,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned flags)
|
2009-09-03 02:04:12 +07:00
|
|
|
{
|
|
|
|
if (cached_ptr && !(*cached_ptr)) {
|
2014-10-13 18:28:38 +07:00
|
|
|
if (!flags || (state->state & flags)) {
|
2009-09-03 02:04:12 +07:00
|
|
|
*cached_ptr = state;
|
2017-03-03 15:55:19 +07:00
|
|
|
refcount_inc(&state->refs);
|
2009-09-03 02:04:12 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-10-13 18:28:38 +07:00
|
|
|
static void cache_state(struct extent_state *state,
|
|
|
|
struct extent_state **cached_ptr)
|
|
|
|
{
|
|
|
|
return cache_state_if_flags(state, cached_ptr,
|
|
|
|
EXTENT_IOBITS | EXTENT_BOUNDARY);
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
2009-09-03 00:24:36 +07:00
|
|
|
* set some bits on a range in the tree. This may require allocations or
|
|
|
|
* sleeping, so the gfp mask is used to indicate what is allowed.
|
2008-01-25 04:13:08 +07:00
|
|
|
*
|
2009-09-03 00:24:36 +07:00
|
|
|
* If any of the exclusive bits are set, this will fail with -EEXIST if some
|
|
|
|
* part of the range already has the desired bits set. The start of the
|
|
|
|
* existing range is returned in failed_start in this case.
|
2008-01-25 04:13:08 +07:00
|
|
|
*
|
2009-09-03 00:24:36 +07:00
|
|
|
* [start, end] is inclusive This takes the tree lock.
|
2008-01-25 04:13:08 +07:00
|
|
|
*/
|
2009-09-03 00:24:36 +07:00
|
|
|
|
2012-03-01 20:57:19 +07:00
|
|
|
static int __must_check
|
|
|
|
__set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits, unsigned exclusive_bits,
|
2013-04-29 20:38:46 +07:00
|
|
|
u64 *failed_start, struct extent_state **cached_state,
|
2015-10-12 13:53:37 +07:00
|
|
|
gfp_t mask, struct extent_changeset *changeset)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state;
|
|
|
|
struct extent_state *prealloc = NULL;
|
|
|
|
struct rb_node *node;
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node **p;
|
|
|
|
struct rb_node *parent;
|
2008-01-25 04:13:08 +07:00
|
|
|
int err = 0;
|
|
|
|
u64 last_start;
|
|
|
|
u64 last_end;
|
2009-09-24 06:51:09 +07:00
|
|
|
|
2013-12-13 22:02:44 +07:00
|
|
|
btrfs_debug_check_extent_io_range(tree, start, end);
|
2013-04-30 22:22:23 +07:00
|
|
|
|
2010-05-16 21:48:47 +07:00
|
|
|
bits |= EXTENT_FIRST_DELALLOC;
|
2008-01-25 04:13:08 +07:00
|
|
|
again:
|
2015-11-07 07:28:21 +07:00
|
|
|
if (!prealloc && gfpflags_allow_blocking(mask)) {
|
2016-04-27 06:03:45 +07:00
|
|
|
/*
|
|
|
|
* Don't care for allocation failure here because we might end
|
|
|
|
* up not needing the pre-allocated extent state at all, which
|
|
|
|
* is the case if we only have in the tree extent states that
|
|
|
|
* cover our input range and don't cover too any other range.
|
|
|
|
* If we end up needing a new extent state we allocate it later.
|
|
|
|
*/
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = alloc_extent_state(mask);
|
|
|
|
}
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2009-09-03 02:22:30 +07:00
|
|
|
if (cached_state && *cached_state) {
|
|
|
|
state = *cached_state;
|
2011-06-21 01:53:48 +07:00
|
|
|
if (state->start <= start && state->end > start &&
|
2014-07-07 02:09:59 +07:00
|
|
|
extent_state_in_tree(state)) {
|
2009-09-03 02:22:30 +07:00
|
|
|
node = &state->rb_node;
|
|
|
|
goto hit_next;
|
|
|
|
}
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2013-11-26 22:41:47 +07:00
|
|
|
node = tree_search_for_insert(tree, start, &p, &parent);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!node) {
|
2011-04-20 13:44:57 +07:00
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2013-11-26 22:41:47 +07:00
|
|
|
err = insert_state(tree, prealloc, start, end,
|
2015-10-12 13:53:37 +07:00
|
|
|
&p, &parent, &bits, changeset);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
|
|
|
|
2013-11-26 22:01:34 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
2009-08-05 23:57:59 +07:00
|
|
|
hit_next:
|
2008-01-25 04:13:08 +07:00
|
|
|
last_start = state->start;
|
|
|
|
last_end = state->end;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
*
|
|
|
|
* Just lock what we found and keep going
|
|
|
|
*/
|
|
|
|
if (state->start == start && state->end <= end) {
|
2009-09-03 00:24:36 +07:00
|
|
|
if (state->state & exclusive_bits) {
|
2008-01-25 04:13:08 +07:00
|
|
|
*failed_start = state->start;
|
|
|
|
err = -EEXIST;
|
|
|
|
goto out;
|
|
|
|
}
|
2009-09-24 06:51:09 +07:00
|
|
|
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, state, &bits, changeset);
|
2009-09-03 02:04:12 +07:00
|
|
|
cache_state(state, cached_state);
|
2008-01-25 04:13:08 +07:00
|
|
|
merge_state(tree, state);
|
2009-05-27 20:16:03 +07:00
|
|
|
if (last_end == (u64)-1)
|
|
|
|
goto out;
|
|
|
|
start = last_end + 1;
|
2012-05-10 17:10:39 +07:00
|
|
|
state = next_state(state);
|
|
|
|
if (start < end && state && state->start == start &&
|
|
|
|
!need_resched())
|
|
|
|
goto hit_next;
|
2008-01-25 04:13:08 +07:00
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
* or
|
|
|
|
* | ------------- state -------------- |
|
|
|
|
*
|
|
|
|
* We need to split the extent we found, and may flip bits on
|
|
|
|
* second half.
|
|
|
|
*
|
|
|
|
* If the extent we found extends past our
|
|
|
|
* range, we just split and search again. It'll get split
|
|
|
|
* again the next time though.
|
|
|
|
*
|
|
|
|
* If the extent we found is inside our range, we set the
|
|
|
|
* desired bit on it.
|
|
|
|
*/
|
|
|
|
if (state->start < start) {
|
2009-09-03 00:24:36 +07:00
|
|
|
if (state->state & exclusive_bits) {
|
2008-01-25 04:13:08 +07:00
|
|
|
*failed_start = start;
|
|
|
|
err = -EEXIST;
|
|
|
|
goto out;
|
|
|
|
}
|
2011-04-20 13:44:57 +07:00
|
|
|
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2008-01-25 04:13:08 +07:00
|
|
|
err = split_state(tree, state, prealloc, start);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
if (state->end <= end) {
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, state, &bits, changeset);
|
2009-09-03 02:04:12 +07:00
|
|
|
cache_state(state, cached_state);
|
2008-01-25 04:13:08 +07:00
|
|
|
merge_state(tree, state);
|
2009-05-27 20:16:03 +07:00
|
|
|
if (last_end == (u64)-1)
|
|
|
|
goto out;
|
|
|
|
start = last_end + 1;
|
2012-05-10 17:10:39 +07:00
|
|
|
state = next_state(state);
|
|
|
|
if (start < end && state && state->start == start &&
|
|
|
|
!need_resched())
|
|
|
|
goto hit_next;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state | or | state |
|
|
|
|
*
|
|
|
|
* There's a hole, we need to insert something in it and
|
|
|
|
* ignore the extent we found.
|
|
|
|
*/
|
|
|
|
if (state->start > start) {
|
|
|
|
u64 this_end;
|
|
|
|
if (end < last_start)
|
|
|
|
this_end = end;
|
|
|
|
else
|
2009-01-06 09:25:51 +07:00
|
|
|
this_end = last_start - 1;
|
2011-04-20 13:44:57 +07:00
|
|
|
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2011-04-20 13:45:49 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Avoid to free 'prealloc' if it can be merged with
|
|
|
|
* the later extent.
|
|
|
|
*/
|
2008-01-25 04:13:08 +07:00
|
|
|
err = insert_state(tree, prealloc, start, this_end,
|
2015-10-12 13:53:37 +07:00
|
|
|
NULL, NULL, &bits, changeset);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
|
|
|
|
2009-09-12 03:12:44 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
|
|
|
prealloc = NULL;
|
2008-01-25 04:13:08 +07:00
|
|
|
start = this_end + 1;
|
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
* We need to split the extent, and set the bit
|
|
|
|
* on the first half
|
|
|
|
*/
|
|
|
|
if (state->start <= end && state->end > end) {
|
2009-09-03 00:24:36 +07:00
|
|
|
if (state->state & exclusive_bits) {
|
2008-01-25 04:13:08 +07:00
|
|
|
*failed_start = start;
|
|
|
|
err = -EEXIST;
|
|
|
|
goto out;
|
|
|
|
}
|
2011-04-20 13:44:57 +07:00
|
|
|
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
|
|
|
BUG_ON(!prealloc);
|
2008-01-25 04:13:08 +07:00
|
|
|
err = split_state(tree, state, prealloc, end + 1);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, prealloc, &bits, changeset);
|
2009-09-03 02:04:12 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
2008-01-25 04:13:08 +07:00
|
|
|
merge_state(tree, prealloc);
|
|
|
|
prealloc = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2016-04-27 06:02:15 +07:00
|
|
|
search_again:
|
|
|
|
if (start > end)
|
|
|
|
goto out;
|
|
|
|
spin_unlock(&tree->lock);
|
|
|
|
if (gfpflags_allow_blocking(mask))
|
|
|
|
cond_resched();
|
|
|
|
goto again;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (prealloc)
|
|
|
|
free_extent_state(prealloc);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2013-04-29 20:38:46 +07:00
|
|
|
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits, u64 * failed_start,
|
2013-04-29 20:38:46 +07:00
|
|
|
struct extent_state **cached_state, gfp_t mask)
|
2012-03-01 20:57:19 +07:00
|
|
|
{
|
|
|
|
return __set_extent_bit(tree, start, end, bits, 0, failed_start,
|
2015-10-12 13:53:37 +07:00
|
|
|
cached_state, mask, NULL);
|
2012-03-01 20:57:19 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2011-09-27 00:56:12 +07:00
|
|
|
/**
|
2012-07-11 14:26:19 +07:00
|
|
|
* convert_extent_bit - convert all bits in a given range from one bit to
|
|
|
|
* another
|
2011-09-27 00:56:12 +07:00
|
|
|
* @tree: the io tree to search
|
|
|
|
* @start: the start offset in bytes
|
|
|
|
* @end: the end offset in bytes (inclusive)
|
|
|
|
* @bits: the bits to set in this range
|
|
|
|
* @clear_bits: the bits to clear in this range
|
2012-09-28 04:07:30 +07:00
|
|
|
* @cached_state: state that we're going to cache
|
2011-09-27 00:56:12 +07:00
|
|
|
*
|
|
|
|
* This will go through and set bits for the given range. If any states exist
|
|
|
|
* already in this range they are set with the given bit and cleared of the
|
|
|
|
* clear_bits. This is only meant to be used by things that are mergeable, ie
|
|
|
|
* converting from say DELALLOC to DIRTY. This is not meant to be used with
|
|
|
|
* boundary bits like LOCK.
|
2016-04-27 04:54:39 +07:00
|
|
|
*
|
|
|
|
* All allocations are done with GFP_NOFS.
|
2011-09-27 00:56:12 +07:00
|
|
|
*/
|
|
|
|
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits, unsigned clear_bits,
|
2016-04-27 04:54:39 +07:00
|
|
|
struct extent_state **cached_state)
|
2011-09-27 00:56:12 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state;
|
|
|
|
struct extent_state *prealloc = NULL;
|
|
|
|
struct rb_node *node;
|
2013-11-26 22:41:47 +07:00
|
|
|
struct rb_node **p;
|
|
|
|
struct rb_node *parent;
|
2011-09-27 00:56:12 +07:00
|
|
|
int err = 0;
|
|
|
|
u64 last_start;
|
|
|
|
u64 last_end;
|
2014-10-13 18:28:39 +07:00
|
|
|
bool first_iteration = true;
|
2011-09-27 00:56:12 +07:00
|
|
|
|
2013-12-13 22:02:44 +07:00
|
|
|
btrfs_debug_check_extent_io_range(tree, start, end);
|
2013-04-30 22:22:23 +07:00
|
|
|
|
2011-09-27 00:56:12 +07:00
|
|
|
again:
|
2016-04-27 04:54:39 +07:00
|
|
|
if (!prealloc) {
|
2014-10-13 18:28:39 +07:00
|
|
|
/*
|
|
|
|
* Best effort, don't worry if extent state allocation fails
|
|
|
|
* here for the first iteration. We might have a cached state
|
|
|
|
* that matches exactly the target range, in which case no
|
|
|
|
* extent state allocations are needed. We'll only know this
|
|
|
|
* after locking the tree.
|
|
|
|
*/
|
2016-04-27 04:54:39 +07:00
|
|
|
prealloc = alloc_extent_state(GFP_NOFS);
|
2014-10-13 18:28:39 +07:00
|
|
|
if (!prealloc && !first_iteration)
|
2011-09-27 00:56:12 +07:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock(&tree->lock);
|
2012-09-28 04:07:30 +07:00
|
|
|
if (cached_state && *cached_state) {
|
|
|
|
state = *cached_state;
|
|
|
|
if (state->start <= start && state->end > start &&
|
2014-07-07 02:09:59 +07:00
|
|
|
extent_state_in_tree(state)) {
|
2012-09-28 04:07:30 +07:00
|
|
|
node = &state->rb_node;
|
|
|
|
goto hit_next;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-09-27 00:56:12 +07:00
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2013-11-26 22:41:47 +07:00
|
|
|
node = tree_search_for_insert(tree, start, &p, &parent);
|
2011-09-27 00:56:12 +07:00
|
|
|
if (!node) {
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
2011-12-08 08:08:40 +07:00
|
|
|
if (!prealloc) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2013-11-26 22:41:47 +07:00
|
|
|
err = insert_state(tree, prealloc, start, end,
|
2015-10-12 13:53:37 +07:00
|
|
|
&p, &parent, &bits, NULL);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
2013-11-26 22:01:34 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
|
|
|
prealloc = NULL;
|
2011-09-27 00:56:12 +07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
hit_next:
|
|
|
|
last_start = state->start;
|
|
|
|
last_end = state->end;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
*
|
|
|
|
* Just lock what we found and keep going
|
|
|
|
*/
|
|
|
|
if (state->start == start && state->end <= end) {
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, state, &bits, NULL);
|
2012-09-28 04:07:30 +07:00
|
|
|
cache_state(state, cached_state);
|
2015-10-12 14:35:38 +07:00
|
|
|
state = clear_state_bit(tree, state, &clear_bits, 0, NULL);
|
2011-09-27 00:56:12 +07:00
|
|
|
if (last_end == (u64)-1)
|
|
|
|
goto out;
|
|
|
|
start = last_end + 1;
|
2012-05-10 17:10:39 +07:00
|
|
|
if (start < end && state && state->start == start &&
|
|
|
|
!need_resched())
|
|
|
|
goto hit_next;
|
2011-09-27 00:56:12 +07:00
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
* or
|
|
|
|
* | ------------- state -------------- |
|
|
|
|
*
|
|
|
|
* We need to split the extent we found, and may flip bits on
|
|
|
|
* second half.
|
|
|
|
*
|
|
|
|
* If the extent we found extends past our
|
|
|
|
* range, we just split and search again. It'll get split
|
|
|
|
* again the next time though.
|
|
|
|
*
|
|
|
|
* If the extent we found is inside our range, we set the
|
|
|
|
* desired bit on it.
|
|
|
|
*/
|
|
|
|
if (state->start < start) {
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
2011-12-08 08:08:40 +07:00
|
|
|
if (!prealloc) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2011-09-27 00:56:12 +07:00
|
|
|
err = split_state(tree, state, prealloc, start);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
2011-09-27 00:56:12 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
if (state->end <= end) {
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, state, &bits, NULL);
|
2012-09-28 04:07:30 +07:00
|
|
|
cache_state(state, cached_state);
|
2015-10-12 14:35:38 +07:00
|
|
|
state = clear_state_bit(tree, state, &clear_bits, 0,
|
|
|
|
NULL);
|
2011-09-27 00:56:12 +07:00
|
|
|
if (last_end == (u64)-1)
|
|
|
|
goto out;
|
|
|
|
start = last_end + 1;
|
2012-05-10 17:10:39 +07:00
|
|
|
if (start < end && state && state->start == start &&
|
|
|
|
!need_resched())
|
|
|
|
goto hit_next;
|
2011-09-27 00:56:12 +07:00
|
|
|
}
|
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state | or | state |
|
|
|
|
*
|
|
|
|
* There's a hole, we need to insert something in it and
|
|
|
|
* ignore the extent we found.
|
|
|
|
*/
|
|
|
|
if (state->start > start) {
|
|
|
|
u64 this_end;
|
|
|
|
if (end < last_start)
|
|
|
|
this_end = end;
|
|
|
|
else
|
|
|
|
this_end = last_start - 1;
|
|
|
|
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
2011-12-08 08:08:40 +07:00
|
|
|
if (!prealloc) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2011-09-27 00:56:12 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Avoid to free 'prealloc' if it can be merged with
|
|
|
|
* the later extent.
|
|
|
|
*/
|
|
|
|
err = insert_state(tree, prealloc, start, this_end,
|
2015-10-12 13:53:37 +07:00
|
|
|
NULL, NULL, &bits, NULL);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
2012-09-28 04:07:30 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
2011-09-27 00:56:12 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
start = this_end + 1;
|
|
|
|
goto search_again;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* | ---- desired range ---- |
|
|
|
|
* | state |
|
|
|
|
* We need to split the extent, and set the bit
|
|
|
|
* on the first half
|
|
|
|
*/
|
|
|
|
if (state->start <= end && state->end > end) {
|
|
|
|
prealloc = alloc_extent_state_atomic(prealloc);
|
2011-12-08 08:08:40 +07:00
|
|
|
if (!prealloc) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2011-09-27 00:56:12 +07:00
|
|
|
|
|
|
|
err = split_state(tree, state, prealloc, end + 1);
|
2011-10-04 10:22:32 +07:00
|
|
|
if (err)
|
|
|
|
extent_io_tree_panic(tree, err);
|
2011-09-27 00:56:12 +07:00
|
|
|
|
2015-10-12 13:53:37 +07:00
|
|
|
set_state_bits(tree, prealloc, &bits, NULL);
|
2012-09-28 04:07:30 +07:00
|
|
|
cache_state(prealloc, cached_state);
|
2015-10-12 14:35:38 +07:00
|
|
|
clear_state_bit(tree, prealloc, &clear_bits, 0, NULL);
|
2011-09-27 00:56:12 +07:00
|
|
|
prealloc = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
search_again:
|
|
|
|
if (start > end)
|
|
|
|
goto out;
|
|
|
|
spin_unlock(&tree->lock);
|
2016-04-27 04:54:39 +07:00
|
|
|
cond_resched();
|
2014-10-13 18:28:39 +07:00
|
|
|
first_iteration = false;
|
2011-09-27 00:56:12 +07:00
|
|
|
goto again;
|
|
|
|
|
|
|
|
out:
|
|
|
|
spin_unlock(&tree->lock);
|
|
|
|
if (prealloc)
|
|
|
|
free_extent_state(prealloc);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/* wrappers around set/clear extent bit */
|
2015-10-12 13:53:37 +07:00
|
|
|
int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
2016-04-27 04:54:39 +07:00
|
|
|
unsigned bits, struct extent_changeset *changeset)
|
2015-10-12 13:53:37 +07:00
|
|
|
{
|
|
|
|
/*
|
|
|
|
* We don't support EXTENT_LOCKED yet, as current changeset will
|
|
|
|
* record any bits changed, so for EXTENT_LOCKED case, it will
|
|
|
|
* either fail with -EEXIST or changeset will record the whole
|
|
|
|
* range.
|
|
|
|
*/
|
|
|
|
BUG_ON(bits & EXTENT_LOCKED);
|
|
|
|
|
2016-04-27 04:54:39 +07:00
|
|
|
return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL, GFP_NOFS,
|
2015-10-12 13:53:37 +07:00
|
|
|
changeset);
|
|
|
|
}
|
|
|
|
|
2015-10-12 14:35:38 +07:00
|
|
|
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
|
|
unsigned bits, int wake, int delete,
|
|
|
|
struct extent_state **cached, gfp_t mask)
|
|
|
|
{
|
|
|
|
return __clear_extent_bit(tree, start, end, bits, wake, delete,
|
|
|
|
cached, mask, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
2016-04-27 04:54:39 +07:00
|
|
|
unsigned bits, struct extent_changeset *changeset)
|
2015-10-12 14:35:38 +07:00
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Don't support EXTENT_LOCKED case, same reason as
|
|
|
|
* set_record_extent_bits().
|
|
|
|
*/
|
|
|
|
BUG_ON(bits & EXTENT_LOCKED);
|
|
|
|
|
2016-04-27 04:54:39 +07:00
|
|
|
return __clear_extent_bit(tree, start, end, bits, 0, 0, NULL, GFP_NOFS,
|
2015-10-12 14:35:38 +07:00
|
|
|
changeset);
|
|
|
|
}
|
|
|
|
|
2008-09-30 02:18:18 +07:00
|
|
|
/*
|
|
|
|
* either insert or lock state struct between start and end use mask to tell
|
|
|
|
* us if waiting is desired.
|
|
|
|
*/
|
2009-09-03 00:24:36 +07:00
|
|
|
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
2015-12-03 20:30:40 +07:00
|
|
|
struct extent_state **cached_state)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
int err;
|
|
|
|
u64 failed_start;
|
2015-01-15 01:52:13 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
while (1) {
|
2015-12-03 20:30:40 +07:00
|
|
|
err = __set_extent_bit(tree, start, end, EXTENT_LOCKED,
|
2012-03-01 20:57:19 +07:00
|
|
|
EXTENT_LOCKED, &failed_start,
|
2015-10-12 13:53:37 +07:00
|
|
|
cached_state, GFP_NOFS, NULL);
|
2012-03-01 20:57:19 +07:00
|
|
|
if (err == -EEXIST) {
|
2008-01-25 04:13:08 +07:00
|
|
|
wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED);
|
|
|
|
start = failed_start;
|
2012-03-01 20:57:19 +07:00
|
|
|
} else
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
WARN_ON(start > end);
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2012-03-01 20:57:19 +07:00
|
|
|
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
|
Btrfs: nuke fs wide allocation mutex V2
This patch removes the giant fs_info->alloc_mutex and replaces it with a bunch
of little locks.
There is now a pinned_mutex, which is used when messing with the pinned_extents
extent io tree, and the extent_ins_mutex which is used with the pending_del and
extent_ins extent io trees.
The locking for the extent tree stuff was inspired by a patch that Yan Zheng
wrote to fix a race condition, I cleaned it up some and changed the locking
around a little bit, but the idea remains the same. Basically instead of
holding the extent_ins_mutex throughout the processing of an extent on the
extent_ins or pending_del trees, we just hold it while we're searching and when
we clear the bits on those trees, and lock the extent for the duration of the
operations on the extent.
Also to keep from getting hung up waiting to lock an extent, I've added a
try_lock_extent so if we cannot lock the extent, move on to the next one in the
tree and we'll come back to that one. I have tested this heavily and it does
not appear to break anything. This has to be applied on top of my
find_free_extent redo patch.
I tested this patch on top of Yan's space reblancing code and it worked fine.
The only thing that has changed since the last version is I pulled out all my
debugging stuff, apparently I forgot to run guilt refresh before I sent the
last patch out. Thank you,
Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-10-30 01:49:05 +07:00
|
|
|
{
|
|
|
|
int err;
|
|
|
|
u64 failed_start;
|
|
|
|
|
2012-03-01 20:57:19 +07:00
|
|
|
err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED,
|
2015-10-12 13:53:37 +07:00
|
|
|
&failed_start, NULL, GFP_NOFS, NULL);
|
2008-10-31 01:19:50 +07:00
|
|
|
if (err == -EEXIST) {
|
|
|
|
if (failed_start > start)
|
|
|
|
clear_extent_bit(tree, start, failed_start - 1,
|
2012-03-01 20:57:19 +07:00
|
|
|
EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS);
|
Btrfs: nuke fs wide allocation mutex V2
This patch removes the giant fs_info->alloc_mutex and replaces it with a bunch
of little locks.
There is now a pinned_mutex, which is used when messing with the pinned_extents
extent io tree, and the extent_ins_mutex which is used with the pending_del and
extent_ins extent io trees.
The locking for the extent tree stuff was inspired by a patch that Yan Zheng
wrote to fix a race condition, I cleaned it up some and changed the locking
around a little bit, but the idea remains the same. Basically instead of
holding the extent_ins_mutex throughout the processing of an extent on the
extent_ins or pending_del trees, we just hold it while we're searching and when
we clear the bits on those trees, and lock the extent for the duration of the
operations on the extent.
Also to keep from getting hung up waiting to lock an extent, I've added a
try_lock_extent so if we cannot lock the extent, move on to the next one in the
tree and we'll come back to that one. I have tested this heavily and it does
not appear to break anything. This has to be applied on top of my
find_free_extent redo patch.
I tested this patch on top of Yan's space reblancing code and it worked fine.
The only thing that has changed since the last version is I pulled out all my
debugging stuff, apparently I forgot to run guilt refresh before I sent the
last patch out. Thank you,
Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-10-30 01:49:05 +07:00
|
|
|
return 0;
|
2008-10-31 01:19:50 +07:00
|
|
|
}
|
Btrfs: nuke fs wide allocation mutex V2
This patch removes the giant fs_info->alloc_mutex and replaces it with a bunch
of little locks.
There is now a pinned_mutex, which is used when messing with the pinned_extents
extent io tree, and the extent_ins_mutex which is used with the pending_del and
extent_ins extent io trees.
The locking for the extent tree stuff was inspired by a patch that Yan Zheng
wrote to fix a race condition, I cleaned it up some and changed the locking
around a little bit, but the idea remains the same. Basically instead of
holding the extent_ins_mutex throughout the processing of an extent on the
extent_ins or pending_del trees, we just hold it while we're searching and when
we clear the bits on those trees, and lock the extent for the duration of the
operations on the extent.
Also to keep from getting hung up waiting to lock an extent, I've added a
try_lock_extent so if we cannot lock the extent, move on to the next one in the
tree and we'll come back to that one. I have tested this heavily and it does
not appear to break anything. This has to be applied on top of my
find_free_extent redo patch.
I tested this patch on top of Yan's space reblancing code and it worked fine.
The only thing that has changed since the last version is I pulled out all my
debugging stuff, apparently I forgot to run guilt refresh before I sent the
last patch out. Thank you,
Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-10-30 01:49:05 +07:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2015-12-03 19:08:59 +07:00
|
|
|
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
|
2013-03-27 00:07:00 +07:00
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long index = start >> PAGE_SHIFT;
|
|
|
|
unsigned long end_index = end >> PAGE_SHIFT;
|
2013-03-27 00:07:00 +07:00
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
while (index <= end_index) {
|
|
|
|
page = find_get_page(inode->i_mapping, index);
|
|
|
|
BUG_ON(!page); /* Pages should be in the extent_io_tree */
|
|
|
|
clear_page_dirty_for_io(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
2013-03-27 00:07:00 +07:00
|
|
|
index++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-12-03 19:08:59 +07:00
|
|
|
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end)
|
2013-03-27 00:07:00 +07:00
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long index = start >> PAGE_SHIFT;
|
|
|
|
unsigned long end_index = end >> PAGE_SHIFT;
|
2013-03-27 00:07:00 +07:00
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
while (index <= end_index) {
|
|
|
|
page = find_get_page(inode->i_mapping, index);
|
|
|
|
BUG_ON(!page); /* Pages should be in the extent_io_tree */
|
|
|
|
__set_page_dirty_nobuffers(page);
|
2015-02-12 06:26:55 +07:00
|
|
|
account_page_redirty(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
2013-03-27 00:07:00 +07:00
|
|
|
index++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* helper function to set both pages and extents in the tree writeback
|
|
|
|
*/
|
2015-12-03 19:08:59 +07:00
|
|
|
static void set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2017-05-05 22:57:13 +07:00
|
|
|
tree->ops->set_range_writeback(tree->private_data, start, end);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2008-09-30 02:18:18 +07:00
|
|
|
/* find the first state struct with 'bits' set after 'start', and
|
|
|
|
* return it. tree->lock must be held. NULL will returned if
|
|
|
|
* nothing was found after 'start'
|
|
|
|
*/
|
2013-04-26 03:41:01 +07:00
|
|
|
static struct extent_state *
|
|
|
|
find_first_extent_bit_state(struct extent_io_tree *tree,
|
2015-01-15 01:52:13 +07:00
|
|
|
u64 start, unsigned bits)
|
2008-02-19 00:12:38 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
struct extent_state *state;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
|
|
|
node = tree_search(tree, start);
|
2009-01-06 09:25:51 +07:00
|
|
|
if (!node)
|
2008-02-19 00:12:38 +07:00
|
|
|
goto out;
|
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (1) {
|
2008-02-19 00:12:38 +07:00
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
2009-01-06 09:25:51 +07:00
|
|
|
if (state->end >= start && (state->state & bits))
|
2008-02-19 00:12:38 +07:00
|
|
|
return state;
|
2009-01-06 09:25:51 +07:00
|
|
|
|
2008-02-19 00:12:38 +07:00
|
|
|
node = rb_next(node);
|
|
|
|
if (!node)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2011-07-14 10:19:45 +07:00
|
|
|
/*
|
|
|
|
* find the first offset in the io tree with 'bits' set. zero is
|
|
|
|
* returned if we find something, and *start_ret and *end_ret are
|
|
|
|
* set to reflect the state struct that was found.
|
|
|
|
*
|
2012-04-06 13:35:47 +07:00
|
|
|
* If nothing was found, 1 is returned. If found something, return 0.
|
2011-07-14 10:19:45 +07:00
|
|
|
*/
|
|
|
|
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
|
2015-01-15 01:52:13 +07:00
|
|
|
u64 *start_ret, u64 *end_ret, unsigned bits,
|
2012-09-28 04:07:30 +07:00
|
|
|
struct extent_state **cached_state)
|
2011-07-14 10:19:45 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state;
|
2012-09-28 04:07:30 +07:00
|
|
|
struct rb_node *n;
|
2011-07-14 10:19:45 +07:00
|
|
|
int ret = 1;
|
|
|
|
|
|
|
|
spin_lock(&tree->lock);
|
2012-09-28 04:07:30 +07:00
|
|
|
if (cached_state && *cached_state) {
|
|
|
|
state = *cached_state;
|
2014-07-07 02:09:59 +07:00
|
|
|
if (state->end == start - 1 && extent_state_in_tree(state)) {
|
2012-09-28 04:07:30 +07:00
|
|
|
n = rb_next(&state->rb_node);
|
|
|
|
while (n) {
|
|
|
|
state = rb_entry(n, struct extent_state,
|
|
|
|
rb_node);
|
|
|
|
if (state->state & bits)
|
|
|
|
goto got_it;
|
|
|
|
n = rb_next(n);
|
|
|
|
}
|
|
|
|
free_extent_state(*cached_state);
|
|
|
|
*cached_state = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
free_extent_state(*cached_state);
|
|
|
|
*cached_state = NULL;
|
|
|
|
}
|
|
|
|
|
2011-07-14 10:19:45 +07:00
|
|
|
state = find_first_extent_bit_state(tree, start, bits);
|
2012-09-28 04:07:30 +07:00
|
|
|
got_it:
|
2011-07-14 10:19:45 +07:00
|
|
|
if (state) {
|
2014-10-13 18:28:38 +07:00
|
|
|
cache_state_if_flags(state, cached_state, 0);
|
2011-07-14 10:19:45 +07:00
|
|
|
*start_ret = state->start;
|
|
|
|
*end_ret = state->end;
|
|
|
|
ret = 0;
|
|
|
|
}
|
2012-09-28 04:07:30 +07:00
|
|
|
out:
|
2011-07-14 10:19:45 +07:00
|
|
|
spin_unlock(&tree->lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-09-30 02:18:18 +07:00
|
|
|
/*
|
|
|
|
* find a contiguous range of bytes in the file marked as delalloc, not
|
|
|
|
* more than 'max_bytes'. start and end are used to return the range,
|
|
|
|
*
|
|
|
|
* 1 is returned if we find something, 0 if nothing was in the tree
|
|
|
|
*/
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
static noinline u64 find_delalloc_range(struct extent_io_tree *tree,
|
2010-02-03 04:19:11 +07:00
|
|
|
u64 *start, u64 *end, u64 max_bytes,
|
|
|
|
struct extent_state **cached_state)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
struct extent_state *state;
|
|
|
|
u64 cur_start = *start;
|
|
|
|
u64 found = 0;
|
|
|
|
u64 total_bytes = 0;
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, cur_start);
|
2008-04-01 22:21:40 +07:00
|
|
|
if (!node) {
|
2008-04-17 22:29:12 +07:00
|
|
|
if (!found)
|
|
|
|
*end = (u64)-1;
|
2008-01-25 04:13:08 +07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (1) {
|
2008-01-25 04:13:08 +07:00
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
2008-09-26 21:05:38 +07:00
|
|
|
if (found && (state->start != cur_start ||
|
|
|
|
(state->state & EXTENT_BOUNDARY))) {
|
2008-01-25 04:13:08 +07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!(state->state & EXTENT_DELALLOC)) {
|
|
|
|
if (!found)
|
|
|
|
*end = state->end;
|
|
|
|
goto out;
|
|
|
|
}
|
2010-02-03 04:19:11 +07:00
|
|
|
if (!found) {
|
2008-01-25 04:13:08 +07:00
|
|
|
*start = state->start;
|
2010-02-03 04:19:11 +07:00
|
|
|
*cached_state = state;
|
2017-03-03 15:55:19 +07:00
|
|
|
refcount_inc(&state->refs);
|
2010-02-03 04:19:11 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
found++;
|
|
|
|
*end = state->end;
|
|
|
|
cur_start = state->end + 1;
|
|
|
|
node = rb_next(node);
|
|
|
|
total_bytes += state->end - state->start + 1;
|
2013-10-08 09:11:09 +07:00
|
|
|
if (total_bytes >= max_bytes)
|
2013-08-31 01:38:49 +07:00
|
|
|
break;
|
|
|
|
if (!node)
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
return found;
|
|
|
|
}
|
|
|
|
|
2017-02-10 22:41:05 +07:00
|
|
|
static int __process_pages_contig(struct address_space *mapping,
|
|
|
|
struct page *locked_page,
|
|
|
|
pgoff_t start_index, pgoff_t end_index,
|
|
|
|
unsigned long page_ops, pgoff_t *index_ret);
|
|
|
|
|
2012-03-01 20:56:26 +07:00
|
|
|
static noinline void __unlock_for_delalloc(struct inode *inode,
|
|
|
|
struct page *locked_page,
|
|
|
|
u64 start, u64 end)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long index = start >> PAGE_SHIFT;
|
|
|
|
unsigned long end_index = end >> PAGE_SHIFT;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2017-02-10 22:42:14 +07:00
|
|
|
ASSERT(locked_page);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (index == locked_page->index && end_index == index)
|
2012-03-01 20:56:26 +07:00
|
|
|
return;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2017-02-10 22:42:14 +07:00
|
|
|
__process_pages_contig(inode->i_mapping, locked_page, index, end_index,
|
|
|
|
PAGE_UNLOCK, NULL);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static noinline int lock_delalloc_pages(struct inode *inode,
|
|
|
|
struct page *locked_page,
|
|
|
|
u64 delalloc_start,
|
|
|
|
u64 delalloc_end)
|
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long index = delalloc_start >> PAGE_SHIFT;
|
2017-02-10 22:42:14 +07:00
|
|
|
unsigned long index_ret = index;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long end_index = delalloc_end >> PAGE_SHIFT;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
int ret;
|
|
|
|
|
2017-02-10 22:42:14 +07:00
|
|
|
ASSERT(locked_page);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (index == locked_page->index && index == end_index)
|
|
|
|
return 0;
|
|
|
|
|
2017-02-10 22:42:14 +07:00
|
|
|
ret = __process_pages_contig(inode->i_mapping, locked_page, index,
|
|
|
|
end_index, PAGE_LOCK, &index_ret);
|
|
|
|
if (ret == -EAGAIN)
|
|
|
|
__unlock_for_delalloc(inode, locked_page, delalloc_start,
|
|
|
|
(u64)index_ret << PAGE_SHIFT);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* find a contiguous range of bytes in the file marked as delalloc, not
|
|
|
|
* more than 'max_bytes'. start and end are used to return the range,
|
|
|
|
*
|
|
|
|
* 1 is returned if we find something, 0 if nothing was in the tree
|
|
|
|
*/
|
2013-10-09 23:00:56 +07:00
|
|
|
STATIC u64 find_lock_delalloc_range(struct inode *inode,
|
|
|
|
struct extent_io_tree *tree,
|
|
|
|
struct page *locked_page, u64 *start,
|
|
|
|
u64 *end, u64 max_bytes)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
{
|
|
|
|
u64 delalloc_start;
|
|
|
|
u64 delalloc_end;
|
|
|
|
u64 found;
|
2009-09-03 02:22:30 +07:00
|
|
|
struct extent_state *cached_state = NULL;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
int ret;
|
|
|
|
int loops = 0;
|
|
|
|
|
|
|
|
again:
|
|
|
|
/* step one, find a bunch of delalloc bytes starting at start */
|
|
|
|
delalloc_start = *start;
|
|
|
|
delalloc_end = 0;
|
|
|
|
found = find_delalloc_range(tree, &delalloc_start, &delalloc_end,
|
2010-02-03 04:19:11 +07:00
|
|
|
max_bytes, &cached_state);
|
2008-10-31 23:46:39 +07:00
|
|
|
if (!found || delalloc_end <= *start) {
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
*start = delalloc_start;
|
|
|
|
*end = delalloc_end;
|
2010-02-03 04:19:11 +07:00
|
|
|
free_extent_state(cached_state);
|
Btrfs: fix crash of compressed writes
The crash[1] is found by xfstests/generic/208 with "-o compress",
it's not reproduced everytime, but it does panic.
The bug is quite interesting, it's actually introduced by a recent commit
(573aecafca1cf7a974231b759197a1aebcf39c2a,
Btrfs: actually limit the size of delalloc range).
Btrfs implements delay allocation, so during writeback, we
(1) get a page A and lock it
(2) search the state tree for delalloc bytes and lock all pages within the range
(3) process the delalloc range, including find disk space and create
ordered extent and so on.
(4) submit the page A.
It runs well in normal cases, but if we're in a racy case, eg.
buffered compressed writes and aio-dio writes,
sometimes we may fail to lock all pages in the 'delalloc' range,
in which case, we need to fall back to search the state tree again with
a smaller range limit(max_bytes = PAGE_CACHE_SIZE - offset).
The mentioned commit has a side effect, that is, in the fallback case,
we can find delalloc bytes before the index of the page we already have locked,
so we're in the case of (delalloc_end <= *start) and return with (found > 0).
This ends with not locking delalloc pages but making ->writepage still
process them, and the crash happens.
This fixes it by just thinking that we find nothing and returning to caller
as the caller knows how to deal with it properly.
[1]:
------------[ cut here ]------------
kernel BUG at mm/page-writeback.c:2170!
[...]
CPU: 2 PID: 11755 Comm: btrfs-delalloc- Tainted: G O 3.11.0+ #8
[...]
RIP: 0010:[<ffffffff810f5093>] [<ffffffff810f5093>] clear_page_dirty_for_io+0x1e/0x83
[...]
[ 4934.248731] Stack:
[ 4934.248731] ffff8801477e5dc8 ffffea00049b9f00 ffff8801869f9ce8 ffffffffa02b841a
[ 4934.248731] 0000000000000000 0000000000000000 0000000000000fff 0000000000000620
[ 4934.248731] ffff88018db59c78 ffffea0005da8d40 ffffffffa02ff860 00000001810016c0
[ 4934.248731] Call Trace:
[ 4934.248731] [<ffffffffa02b841a>] extent_range_clear_dirty_for_io+0xcf/0xf5 [btrfs]
[ 4934.248731] [<ffffffffa02a8889>] compress_file_range+0x1dc/0x4cb [btrfs]
[ 4934.248731] [<ffffffff8104f7af>] ? detach_if_pending+0x22/0x4b
[ 4934.248731] [<ffffffffa02a8bad>] async_cow_start+0x35/0x53 [btrfs]
[ 4934.248731] [<ffffffffa02c694b>] worker_loop+0x14b/0x48c [btrfs]
[ 4934.248731] [<ffffffffa02c6800>] ? btrfs_queue_worker+0x25c/0x25c [btrfs]
[ 4934.248731] [<ffffffff810608f5>] kthread+0x8d/0x95
[ 4934.248731] [<ffffffff81060868>] ? kthread_freezable_should_stop+0x43/0x43
[ 4934.248731] [<ffffffff814fe09c>] ret_from_fork+0x7c/0xb0
[ 4934.248731] [<ffffffff81060868>] ? kthread_freezable_should_stop+0x43/0x43
[ 4934.248731] Code: ff 85 c0 0f 94 c0 0f b6 c0 59 5b 5d c3 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb e8 2c de 00 00 49 89 c4 48 8b 03 a8 01 75 02 <0f> 0b 4d 85 e4 74 52 49 8b 84 24 80 00 00 00 f6 40 20 01 75 44
[ 4934.248731] RIP [<ffffffff810f5093>] clear_page_dirty_for_io+0x1e/0x83
[ 4934.248731] RSP <ffff8801869f9c48>
[ 4934.280307] ---[ end trace 36f06d3f8750236a ]---
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-10-01 22:49:49 +07:00
|
|
|
return 0;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
}
|
|
|
|
|
2008-10-31 23:46:39 +07:00
|
|
|
/*
|
|
|
|
* start comes from the offset of locked_page. We have to lock
|
|
|
|
* pages in order, so we can't process delalloc bytes before
|
|
|
|
* locked_page
|
|
|
|
*/
|
2009-01-06 09:25:51 +07:00
|
|
|
if (delalloc_start < *start)
|
2008-10-31 23:46:39 +07:00
|
|
|
delalloc_start = *start;
|
|
|
|
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
/*
|
|
|
|
* make sure to limit the number of pages we try to lock down
|
|
|
|
*/
|
2013-10-08 09:11:09 +07:00
|
|
|
if (delalloc_end + 1 - delalloc_start > max_bytes)
|
|
|
|
delalloc_end = delalloc_start + max_bytes - 1;
|
2009-01-06 09:25:51 +07:00
|
|
|
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
/* step two, lock all the pages after the page that has start */
|
|
|
|
ret = lock_delalloc_pages(inode, locked_page,
|
|
|
|
delalloc_start, delalloc_end);
|
|
|
|
if (ret == -EAGAIN) {
|
|
|
|
/* some of the pages are gone, lets avoid looping by
|
|
|
|
* shortening the size of the delalloc range we're searching
|
|
|
|
*/
|
2009-09-03 02:22:30 +07:00
|
|
|
free_extent_state(cached_state);
|
2014-05-21 19:49:54 +07:00
|
|
|
cached_state = NULL;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (!loops) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
max_bytes = PAGE_SIZE;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
loops = 1;
|
|
|
|
goto again;
|
|
|
|
} else {
|
|
|
|
found = 0;
|
|
|
|
goto out_failed;
|
|
|
|
}
|
|
|
|
}
|
2012-03-12 22:03:00 +07:00
|
|
|
BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
|
|
|
/* step three, lock the state bits for the whole range */
|
2015-12-03 20:30:40 +07:00
|
|
|
lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
|
|
|
/* then test to make sure it is all still delalloc */
|
|
|
|
ret = test_range_bit(tree, delalloc_start, delalloc_end,
|
2009-09-03 02:22:30 +07:00
|
|
|
EXTENT_DELALLOC, 1, cached_state);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (!ret) {
|
2009-09-03 02:22:30 +07:00
|
|
|
unlock_extent_cached(tree, delalloc_start, delalloc_end,
|
|
|
|
&cached_state, GFP_NOFS);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
__unlock_for_delalloc(inode, locked_page,
|
|
|
|
delalloc_start, delalloc_end);
|
|
|
|
cond_resched();
|
|
|
|
goto again;
|
|
|
|
}
|
2009-09-03 02:22:30 +07:00
|
|
|
free_extent_state(cached_state);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
*start = delalloc_start;
|
|
|
|
*end = delalloc_end;
|
|
|
|
out_failed:
|
|
|
|
return found;
|
|
|
|
}
|
|
|
|
|
2017-02-10 22:41:05 +07:00
|
|
|
static int __process_pages_contig(struct address_space *mapping,
|
|
|
|
struct page *locked_page,
|
|
|
|
pgoff_t start_index, pgoff_t end_index,
|
|
|
|
unsigned long page_ops, pgoff_t *index_ret)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
{
|
2017-02-03 08:49:22 +07:00
|
|
|
unsigned long nr_pages = end_index - start_index + 1;
|
2017-02-10 22:41:05 +07:00
|
|
|
unsigned long pages_locked = 0;
|
2017-02-03 08:49:22 +07:00
|
|
|
pgoff_t index = start_index;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
struct page *pages[16];
|
2017-02-03 08:49:22 +07:00
|
|
|
unsigned ret;
|
2017-02-10 22:41:05 +07:00
|
|
|
int err = 0;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
int i;
|
2008-11-07 10:02:51 +07:00
|
|
|
|
2017-02-10 22:41:05 +07:00
|
|
|
if (page_ops & PAGE_LOCK) {
|
|
|
|
ASSERT(page_ops == PAGE_LOCK);
|
|
|
|
ASSERT(index_ret && *index_ret == start_index);
|
|
|
|
}
|
|
|
|
|
2014-10-07 04:14:22 +07:00
|
|
|
if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0)
|
2017-02-03 08:49:22 +07:00
|
|
|
mapping_set_error(mapping, -EIO);
|
2014-10-07 04:14:22 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (nr_pages > 0) {
|
2017-02-03 08:49:22 +07:00
|
|
|
ret = find_get_pages_contig(mapping, index,
|
2008-11-11 21:34:41 +07:00
|
|
|
min_t(unsigned long,
|
|
|
|
nr_pages, ARRAY_SIZE(pages)), pages);
|
2017-02-10 22:41:05 +07:00
|
|
|
if (ret == 0) {
|
|
|
|
/*
|
|
|
|
* Only if we're going to lock these pages,
|
|
|
|
* can we find nothing at @index.
|
|
|
|
*/
|
|
|
|
ASSERT(page_ops & PAGE_LOCK);
|
2017-03-07 09:20:56 +07:00
|
|
|
err = -EAGAIN;
|
|
|
|
goto out;
|
2017-02-10 22:41:05 +07:00
|
|
|
}
|
2009-09-03 03:53:46 +07:00
|
|
|
|
2017-02-10 22:41:05 +07:00
|
|
|
for (i = 0; i < ret; i++) {
|
2013-07-29 22:20:47 +07:00
|
|
|
if (page_ops & PAGE_SET_PRIVATE2)
|
2009-09-03 03:53:46 +07:00
|
|
|
SetPagePrivate2(pages[i]);
|
|
|
|
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (pages[i] == locked_page) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(pages[i]);
|
2017-02-10 22:41:05 +07:00
|
|
|
pages_locked++;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
continue;
|
|
|
|
}
|
2013-07-29 22:20:47 +07:00
|
|
|
if (page_ops & PAGE_CLEAR_DIRTY)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
clear_page_dirty_for_io(pages[i]);
|
2013-07-29 22:20:47 +07:00
|
|
|
if (page_ops & PAGE_SET_WRITEBACK)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
set_page_writeback(pages[i]);
|
2014-10-07 04:14:22 +07:00
|
|
|
if (page_ops & PAGE_SET_ERROR)
|
|
|
|
SetPageError(pages[i]);
|
2013-07-29 22:20:47 +07:00
|
|
|
if (page_ops & PAGE_END_WRITEBACK)
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
end_page_writeback(pages[i]);
|
2013-07-29 22:20:47 +07:00
|
|
|
if (page_ops & PAGE_UNLOCK)
|
2008-11-07 10:02:51 +07:00
|
|
|
unlock_page(pages[i]);
|
2017-02-10 22:41:05 +07:00
|
|
|
if (page_ops & PAGE_LOCK) {
|
|
|
|
lock_page(pages[i]);
|
|
|
|
if (!PageDirty(pages[i]) ||
|
|
|
|
pages[i]->mapping != mapping) {
|
|
|
|
unlock_page(pages[i]);
|
|
|
|
put_page(pages[i]);
|
|
|
|
err = -EAGAIN;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(pages[i]);
|
2017-02-10 22:41:05 +07:00
|
|
|
pages_locked++;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
}
|
|
|
|
nr_pages -= ret;
|
|
|
|
index += ret;
|
|
|
|
cond_resched();
|
|
|
|
}
|
2017-02-10 22:41:05 +07:00
|
|
|
out:
|
|
|
|
if (err && index_ret)
|
|
|
|
*index_ret = start_index + pages_locked - 1;
|
|
|
|
return err;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
}
|
|
|
|
|
2017-02-03 08:49:22 +07:00
|
|
|
void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
|
|
|
|
u64 delalloc_end, struct page *locked_page,
|
|
|
|
unsigned clear_bits,
|
|
|
|
unsigned long page_ops)
|
|
|
|
{
|
|
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, clear_bits, 1, 0,
|
|
|
|
NULL, GFP_NOFS);
|
|
|
|
|
|
|
|
__process_pages_contig(inode->i_mapping, locked_page,
|
|
|
|
start >> PAGE_SHIFT, end >> PAGE_SHIFT,
|
2017-02-10 22:41:05 +07:00
|
|
|
page_ops, NULL);
|
2017-02-03 08:49:22 +07:00
|
|
|
}
|
|
|
|
|
2008-09-30 02:18:18 +07:00
|
|
|
/*
|
|
|
|
* count the number of bytes in the tree that have a given bit(s)
|
|
|
|
* set. This can be fairly slow, except for EXTENT_DIRTY which is
|
|
|
|
* cached. The total number found is returned.
|
|
|
|
*/
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 count_range_bits(struct extent_io_tree *tree,
|
|
|
|
u64 *start, u64 search_end, u64 max_bytes,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits, int contig)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
struct extent_state *state;
|
|
|
|
u64 cur_start = *start;
|
|
|
|
u64 total_bytes = 0;
|
2011-02-24 04:23:20 +07:00
|
|
|
u64 last = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
int found = 0;
|
|
|
|
|
2013-10-31 12:00:08 +07:00
|
|
|
if (WARN_ON(search_end <= cur_start))
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (cur_start == 0 && bits == EXTENT_DIRTY) {
|
|
|
|
total_bytes = tree->dirty_bytes;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, cur_start);
|
2009-01-06 09:25:51 +07:00
|
|
|
if (!node)
|
2008-01-25 04:13:08 +07:00
|
|
|
goto out;
|
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (1) {
|
2008-01-25 04:13:08 +07:00
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
if (state->start > search_end)
|
|
|
|
break;
|
2011-02-24 04:23:20 +07:00
|
|
|
if (contig && found && state->start > last + 1)
|
|
|
|
break;
|
|
|
|
if (state->end >= cur_start && (state->state & bits) == bits) {
|
2008-01-25 04:13:08 +07:00
|
|
|
total_bytes += min(search_end, state->end) + 1 -
|
|
|
|
max(cur_start, state->start);
|
|
|
|
if (total_bytes >= max_bytes)
|
|
|
|
break;
|
|
|
|
if (!found) {
|
2011-05-04 22:11:17 +07:00
|
|
|
*start = max(cur_start, state->start);
|
2008-01-25 04:13:08 +07:00
|
|
|
found = 1;
|
|
|
|
}
|
2011-02-24 04:23:20 +07:00
|
|
|
last = state->end;
|
|
|
|
} else if (contig && found) {
|
|
|
|
break;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
node = rb_next(node);
|
|
|
|
if (!node)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
return total_bytes;
|
|
|
|
}
|
2008-12-02 21:54:17 +07:00
|
|
|
|
2008-09-30 02:18:18 +07:00
|
|
|
/*
|
|
|
|
* set the private field for a given byte offset in the tree. If there isn't
|
|
|
|
* an extent_state there already, this does nothing.
|
|
|
|
*/
|
2016-02-23 04:53:20 +07:00
|
|
|
static noinline int set_state_failrec(struct extent_io_tree *tree, u64 start,
|
2016-02-11 19:24:13 +07:00
|
|
|
struct io_failure_record *failrec)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
struct extent_state *state;
|
|
|
|
int ret = 0;
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, start);
|
2008-04-01 22:21:40 +07:00
|
|
|
if (!node) {
|
2008-01-25 04:13:08 +07:00
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
if (state->start != start) {
|
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
2016-02-11 19:24:13 +07:00
|
|
|
state->failrec = failrec;
|
2008-01-25 04:13:08 +07:00
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2016-02-23 04:53:20 +07:00
|
|
|
static noinline int get_state_failrec(struct extent_io_tree *tree, u64 start,
|
2016-02-11 19:24:13 +07:00
|
|
|
struct io_failure_record **failrec)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct rb_node *node;
|
|
|
|
struct extent_state *state;
|
|
|
|
int ret = 0;
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* this search will find all the extents that end after
|
|
|
|
* our range starts.
|
|
|
|
*/
|
2008-02-02 02:51:59 +07:00
|
|
|
node = tree_search(tree, start);
|
2008-04-01 22:21:40 +07:00
|
|
|
if (!node) {
|
2008-01-25 04:13:08 +07:00
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
if (state->start != start) {
|
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
2016-02-11 19:24:13 +07:00
|
|
|
*failrec = state->failrec;
|
2008-01-25 04:13:08 +07:00
|
|
|
out:
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* searches a range in the state tree for a given mask.
|
2008-01-29 21:59:12 +07:00
|
|
|
* If 'filled' == 1, this returns 1 only if every extent in the tree
|
2008-01-25 04:13:08 +07:00
|
|
|
* has the bits set. Otherwise, 1 is returned if any bit in the
|
|
|
|
* range is found set.
|
|
|
|
*/
|
|
|
|
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
2015-01-15 01:52:13 +07:00
|
|
|
unsigned bits, int filled, struct extent_state *cached)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_state *state = NULL;
|
|
|
|
struct rb_node *node;
|
|
|
|
int bitset = 0;
|
|
|
|
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_lock(&tree->lock);
|
2014-07-07 02:09:59 +07:00
|
|
|
if (cached && extent_state_in_tree(cached) && cached->start <= start &&
|
2011-06-21 01:53:48 +07:00
|
|
|
cached->end > start)
|
2009-09-03 02:22:30 +07:00
|
|
|
node = &cached->rb_node;
|
|
|
|
else
|
|
|
|
node = tree_search(tree, start);
|
2008-01-25 04:13:08 +07:00
|
|
|
while (node && start <= end) {
|
|
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
|
|
|
|
|
|
if (filled && state->start > start) {
|
|
|
|
bitset = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (state->start > end)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (state->state & bits) {
|
|
|
|
bitset = 1;
|
|
|
|
if (!filled)
|
|
|
|
break;
|
|
|
|
} else if (filled) {
|
|
|
|
bitset = 0;
|
|
|
|
break;
|
|
|
|
}
|
2009-09-24 07:23:16 +07:00
|
|
|
|
|
|
|
if (state->end == (u64)-1)
|
|
|
|
break;
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
start = state->end + 1;
|
|
|
|
if (start > end)
|
|
|
|
break;
|
|
|
|
node = rb_next(node);
|
|
|
|
if (!node) {
|
|
|
|
if (filled)
|
|
|
|
bitset = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2008-12-18 02:51:42 +07:00
|
|
|
spin_unlock(&tree->lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
return bitset;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* helper function to set a given page up to date if all the
|
|
|
|
* extents in the tree for that page are up to date
|
|
|
|
*/
|
2012-03-01 20:56:26 +07:00
|
|
|
static void check_page_uptodate(struct extent_io_tree *tree, struct page *page)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 end = start + PAGE_SIZE - 1;
|
2009-09-03 02:22:30 +07:00
|
|
|
if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL))
|
2008-01-25 04:13:08 +07:00
|
|
|
SetPageUptodate(page);
|
|
|
|
}
|
|
|
|
|
2017-05-05 22:57:15 +07:00
|
|
|
int free_io_failure(struct extent_io_tree *failure_tree,
|
|
|
|
struct extent_io_tree *io_tree,
|
|
|
|
struct io_failure_record *rec)
|
2011-07-22 20:41:52 +07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
int err = 0;
|
|
|
|
|
2016-02-11 19:24:13 +07:00
|
|
|
set_state_failrec(failure_tree, rec->start, NULL);
|
2011-07-22 20:41:52 +07:00
|
|
|
ret = clear_extent_bits(failure_tree, rec->start,
|
|
|
|
rec->start + rec->len - 1,
|
2016-04-27 04:54:39 +07:00
|
|
|
EXTENT_LOCKED | EXTENT_DIRTY);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (ret)
|
|
|
|
err = ret;
|
|
|
|
|
2017-05-05 22:57:15 +07:00
|
|
|
ret = clear_extent_bits(io_tree, rec->start,
|
2013-01-30 06:40:14 +07:00
|
|
|
rec->start + rec->len - 1,
|
2016-04-27 04:54:39 +07:00
|
|
|
EXTENT_DAMAGED);
|
2013-01-30 06:40:14 +07:00
|
|
|
if (ret && !err)
|
|
|
|
err = ret;
|
2011-07-22 20:41:52 +07:00
|
|
|
|
|
|
|
kfree(rec);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this bypasses the standard btrfs submit functions deliberately, as
|
|
|
|
* the standard behavior is to write all copies in a raid setup. here we only
|
|
|
|
* want to write the one bad copy. so we do the mapping for ourselves and issue
|
|
|
|
* submit_bio directly.
|
2012-11-05 21:46:42 +07:00
|
|
|
* to avoid any synchronization issues, wait for the data after writing, which
|
2011-07-22 20:41:52 +07:00
|
|
|
* actually prevents the read that triggered the error from finishing.
|
|
|
|
* currently, there can be no more than two copies of every data bit. thus,
|
|
|
|
* exactly one rewrite is required.
|
|
|
|
*/
|
2017-05-05 22:57:14 +07:00
|
|
|
int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
|
|
|
|
u64 length, u64 logical, struct page *page,
|
|
|
|
unsigned int pg_offset, int mirror_num)
|
2011-07-22 20:41:52 +07:00
|
|
|
{
|
|
|
|
struct bio *bio;
|
|
|
|
struct btrfs_device *dev;
|
|
|
|
u64 map_length = 0;
|
|
|
|
u64 sector;
|
|
|
|
struct btrfs_bio *bbio = NULL;
|
|
|
|
int ret;
|
|
|
|
|
2013-11-04 00:06:39 +07:00
|
|
|
ASSERT(!(fs_info->sb->s_flags & MS_RDONLY));
|
2011-07-22 20:41:52 +07:00
|
|
|
BUG_ON(!mirror_num);
|
|
|
|
|
2017-06-12 22:29:41 +07:00
|
|
|
bio = btrfs_io_bio_alloc(1);
|
2013-10-12 05:44:27 +07:00
|
|
|
bio->bi_iter.bi_size = 0;
|
2011-07-22 20:41:52 +07:00
|
|
|
map_length = length;
|
|
|
|
|
2016-05-28 04:21:27 +07:00
|
|
|
/*
|
|
|
|
* Avoid races with device replace and make sure our bbio has devices
|
|
|
|
* associated to its stripes that don't go away while we are doing the
|
|
|
|
* read repair operation.
|
|
|
|
*/
|
|
|
|
btrfs_bio_counter_inc_blocked(fs_info);
|
2017-07-19 14:48:42 +07:00
|
|
|
if (btrfs_is_parity_mirror(fs_info, logical, length)) {
|
2017-03-30 00:53:58 +07:00
|
|
|
/*
|
|
|
|
* Note that we don't use BTRFS_MAP_WRITE because it's supposed
|
|
|
|
* to update all raid stripes, but here we just want to correct
|
|
|
|
* bad stripe, thus BTRFS_MAP_READ is abused to only get the bad
|
|
|
|
* stripe's dev and sector.
|
|
|
|
*/
|
|
|
|
ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical,
|
|
|
|
&map_length, &bbio, 0);
|
|
|
|
if (ret) {
|
|
|
|
btrfs_bio_counter_dec(fs_info);
|
|
|
|
bio_put(bio);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
ASSERT(bbio->mirror_num == 1);
|
|
|
|
} else {
|
|
|
|
ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
|
|
|
|
&map_length, &bbio, mirror_num);
|
|
|
|
if (ret) {
|
|
|
|
btrfs_bio_counter_dec(fs_info);
|
|
|
|
bio_put(bio);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
BUG_ON(mirror_num != bbio->mirror_num);
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
2017-03-30 00:53:58 +07:00
|
|
|
|
|
|
|
sector = bbio->stripes[bbio->mirror_num - 1].physical >> 9;
|
2013-10-12 05:44:27 +07:00
|
|
|
bio->bi_iter.bi_sector = sector;
|
2017-03-30 00:53:58 +07:00
|
|
|
dev = bbio->stripes[bbio->mirror_num - 1].dev;
|
2015-01-20 14:11:34 +07:00
|
|
|
btrfs_put_bbio(bbio);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (!dev || !dev->bdev || !dev->writeable) {
|
2016-05-28 04:21:27 +07:00
|
|
|
btrfs_bio_counter_dec(fs_info);
|
2011-07-22 20:41:52 +07:00
|
|
|
bio_put(bio);
|
|
|
|
return -EIO;
|
|
|
|
}
|
2017-08-24 00:10:32 +07:00
|
|
|
bio_set_dev(bio, dev->bdev);
|
2016-11-01 20:40:10 +07:00
|
|
|
bio->bi_opf = REQ_OP_WRITE | REQ_SYNC;
|
2014-09-12 17:44:00 +07:00
|
|
|
bio_add_page(bio, page, length, pg_offset);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2016-06-06 02:31:41 +07:00
|
|
|
if (btrfsic_submit_bio_wait(bio)) {
|
2011-07-22 20:41:52 +07:00
|
|
|
/* try to remap that extent elsewhere? */
|
2016-05-28 04:21:27 +07:00
|
|
|
btrfs_bio_counter_dec(fs_info);
|
2011-07-22 20:41:52 +07:00
|
|
|
bio_put(bio);
|
2012-05-25 21:06:08 +07:00
|
|
|
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
|
2011-07-22 20:41:52 +07:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
2015-10-08 15:43:10 +07:00
|
|
|
btrfs_info_rl_in_rcu(fs_info,
|
|
|
|
"read error corrected: ino %llu off %llu (dev %s sector %llu)",
|
2017-05-05 22:57:14 +07:00
|
|
|
ino, start,
|
2014-09-12 17:44:01 +07:00
|
|
|
rcu_str_deref(dev->name), sector);
|
2016-05-28 04:21:27 +07:00
|
|
|
btrfs_bio_counter_dec(fs_info);
|
2011-07-22 20:41:52 +07:00
|
|
|
bio_put(bio);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-06-23 05:54:24 +07:00
|
|
|
int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
|
|
|
|
struct extent_buffer *eb, int mirror_num)
|
2012-03-27 08:57:36 +07:00
|
|
|
{
|
|
|
|
u64 start = eb->start;
|
|
|
|
unsigned long i, num_pages = num_extent_pages(eb->start, eb->len);
|
2012-04-13 02:55:15 +07:00
|
|
|
int ret = 0;
|
2012-03-27 08:57:36 +07:00
|
|
|
|
2017-07-17 14:45:34 +07:00
|
|
|
if (sb_rdonly(fs_info->sb))
|
2013-11-04 00:06:39 +07:00
|
|
|
return -EROFS;
|
|
|
|
|
2012-03-27 08:57:36 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
struct page *p = eb->pages[i];
|
2014-09-12 17:44:01 +07:00
|
|
|
|
2017-05-05 22:57:14 +07:00
|
|
|
ret = repair_io_failure(fs_info, 0, start, PAGE_SIZE, start, p,
|
2014-09-12 17:44:01 +07:00
|
|
|
start - page_offset(p), mirror_num);
|
2012-03-27 08:57:36 +07:00
|
|
|
if (ret)
|
|
|
|
break;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
start += PAGE_SIZE;
|
2012-03-27 08:57:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-07-22 20:41:52 +07:00
|
|
|
/*
|
|
|
|
* each time an IO finishes, we do a fast check in the IO failure tree
|
|
|
|
* to see if we need to process or clean up an io_failure_record
|
|
|
|
*/
|
2017-05-05 22:57:15 +07:00
|
|
|
int clean_io_failure(struct btrfs_fs_info *fs_info,
|
|
|
|
struct extent_io_tree *failure_tree,
|
|
|
|
struct extent_io_tree *io_tree, u64 start,
|
|
|
|
struct page *page, u64 ino, unsigned int pg_offset)
|
2011-07-22 20:41:52 +07:00
|
|
|
{
|
|
|
|
u64 private;
|
|
|
|
struct io_failure_record *failrec;
|
|
|
|
struct extent_state *state;
|
|
|
|
int num_copies;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
private = 0;
|
2017-05-05 22:57:15 +07:00
|
|
|
ret = count_range_bits(failure_tree, &private, (u64)-1, 1,
|
|
|
|
EXTENT_DIRTY, 0);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (!ret)
|
|
|
|
return 0;
|
|
|
|
|
2017-05-05 22:57:15 +07:00
|
|
|
ret = get_state_failrec(failure_tree, start, &failrec);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (ret)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
BUG_ON(!failrec->this_mirror);
|
|
|
|
|
|
|
|
if (failrec->in_validation) {
|
|
|
|
/* there was no real error, just free the record */
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"clean_io_failure: freeing dummy error at %llu",
|
|
|
|
failrec->start);
|
2011-07-22 20:41:52 +07:00
|
|
|
goto out;
|
|
|
|
}
|
2017-07-17 14:45:34 +07:00
|
|
|
if (sb_rdonly(fs_info->sb))
|
2013-11-04 00:06:39 +07:00
|
|
|
goto out;
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2017-05-05 22:57:15 +07:00
|
|
|
spin_lock(&io_tree->lock);
|
|
|
|
state = find_first_extent_bit_state(io_tree,
|
2011-07-22 20:41:52 +07:00
|
|
|
failrec->start,
|
|
|
|
EXTENT_LOCKED);
|
2017-05-05 22:57:15 +07:00
|
|
|
spin_unlock(&io_tree->lock);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2013-07-25 18:22:35 +07:00
|
|
|
if (state && state->start <= failrec->start &&
|
|
|
|
state->end >= failrec->start + failrec->len - 1) {
|
2012-11-05 21:46:42 +07:00
|
|
|
num_copies = btrfs_num_copies(fs_info, failrec->logical,
|
|
|
|
failrec->len);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (num_copies > 1) {
|
2017-05-05 22:57:15 +07:00
|
|
|
repair_io_failure(fs_info, ino, start, failrec->len,
|
|
|
|
failrec->logical, page, pg_offset,
|
|
|
|
failrec->failed_mirror);
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
2017-05-05 22:57:15 +07:00
|
|
|
free_io_failure(failure_tree, io_tree, failrec);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2014-09-12 17:43:58 +07:00
|
|
|
return 0;
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
|
|
|
|
Btrfs: cleanup the read failure record after write or when the inode is freeing
After the data is written successfully, we should cleanup the read failure record
in that range because
- If we set data COW for the file, the range that the failure record pointed to is
mapped to a new place, so it is invalid.
- If we set no data COW for the file, and if there is no error during writting,
the corrupted data is corrected, so the failure record can be removed. And if
some errors happen on the mirrors, we also needn't worry about it because the
failure record will be recreated if we read the same place again.
Sometimes, we may fail to correct the data, so the failure records will be left
in the tree, we need free them when we free the inode or the memory leak happens.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-12 17:44:04 +07:00
|
|
|
/*
|
|
|
|
* Can be called when
|
|
|
|
* - hold extent lock
|
|
|
|
* - under ordered extent
|
|
|
|
* - the inode is freeing
|
|
|
|
*/
|
2017-02-20 18:50:57 +07:00
|
|
|
void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end)
|
Btrfs: cleanup the read failure record after write or when the inode is freeing
After the data is written successfully, we should cleanup the read failure record
in that range because
- If we set data COW for the file, the range that the failure record pointed to is
mapped to a new place, so it is invalid.
- If we set no data COW for the file, and if there is no error during writting,
the corrupted data is corrected, so the failure record can be removed. And if
some errors happen on the mirrors, we also needn't worry about it because the
failure record will be recreated if we read the same place again.
Sometimes, we may fail to correct the data, so the failure records will be left
in the tree, we need free them when we free the inode or the memory leak happens.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-12 17:44:04 +07:00
|
|
|
{
|
2017-02-20 18:50:57 +07:00
|
|
|
struct extent_io_tree *failure_tree = &inode->io_failure_tree;
|
Btrfs: cleanup the read failure record after write or when the inode is freeing
After the data is written successfully, we should cleanup the read failure record
in that range because
- If we set data COW for the file, the range that the failure record pointed to is
mapped to a new place, so it is invalid.
- If we set no data COW for the file, and if there is no error during writting,
the corrupted data is corrected, so the failure record can be removed. And if
some errors happen on the mirrors, we also needn't worry about it because the
failure record will be recreated if we read the same place again.
Sometimes, we may fail to correct the data, so the failure records will be left
in the tree, we need free them when we free the inode or the memory leak happens.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-12 17:44:04 +07:00
|
|
|
struct io_failure_record *failrec;
|
|
|
|
struct extent_state *state, *next;
|
|
|
|
|
|
|
|
if (RB_EMPTY_ROOT(&failure_tree->state))
|
|
|
|
return;
|
|
|
|
|
|
|
|
spin_lock(&failure_tree->lock);
|
|
|
|
state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY);
|
|
|
|
while (state) {
|
|
|
|
if (state->start > end)
|
|
|
|
break;
|
|
|
|
|
|
|
|
ASSERT(state->end <= end);
|
|
|
|
|
|
|
|
next = next_state(state);
|
|
|
|
|
2016-02-11 19:24:13 +07:00
|
|
|
failrec = state->failrec;
|
Btrfs: cleanup the read failure record after write or when the inode is freeing
After the data is written successfully, we should cleanup the read failure record
in that range because
- If we set data COW for the file, the range that the failure record pointed to is
mapped to a new place, so it is invalid.
- If we set no data COW for the file, and if there is no error during writting,
the corrupted data is corrected, so the failure record can be removed. And if
some errors happen on the mirrors, we also needn't worry about it because the
failure record will be recreated if we read the same place again.
Sometimes, we may fail to correct the data, so the failure records will be left
in the tree, we need free them when we free the inode or the memory leak happens.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-12 17:44:04 +07:00
|
|
|
free_extent_state(state);
|
|
|
|
kfree(failrec);
|
|
|
|
|
|
|
|
state = next;
|
|
|
|
}
|
|
|
|
spin_unlock(&failure_tree->lock);
|
|
|
|
}
|
|
|
|
|
2014-09-12 17:43:59 +07:00
|
|
|
int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
|
2016-02-11 19:24:13 +07:00
|
|
|
struct io_failure_record **failrec_ret)
|
2011-07-22 20:41:52 +07:00
|
|
|
{
|
2016-09-20 21:05:02 +07:00
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
2014-09-12 17:43:59 +07:00
|
|
|
struct io_failure_record *failrec;
|
2011-07-22 20:41:52 +07:00
|
|
|
struct extent_map *em;
|
|
|
|
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
|
|
|
|
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
|
|
|
|
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
|
|
|
|
int ret;
|
|
|
|
u64 logical;
|
|
|
|
|
2016-02-11 19:24:13 +07:00
|
|
|
ret = get_state_failrec(failure_tree, start, &failrec);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (ret) {
|
|
|
|
failrec = kzalloc(sizeof(*failrec), GFP_NOFS);
|
|
|
|
if (!failrec)
|
|
|
|
return -ENOMEM;
|
2014-09-12 17:43:59 +07:00
|
|
|
|
2011-07-22 20:41:52 +07:00
|
|
|
failrec->start = start;
|
|
|
|
failrec->len = end - start + 1;
|
|
|
|
failrec->this_mirror = 0;
|
|
|
|
failrec->bio_flags = 0;
|
|
|
|
failrec->in_validation = 0;
|
|
|
|
|
|
|
|
read_lock(&em_tree->lock);
|
|
|
|
em = lookup_extent_mapping(em_tree, start, failrec->len);
|
|
|
|
if (!em) {
|
|
|
|
read_unlock(&em_tree->lock);
|
|
|
|
kfree(failrec);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
2013-11-25 10:22:07 +07:00
|
|
|
if (em->start > start || em->start + em->len <= start) {
|
2011-07-22 20:41:52 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
em = NULL;
|
|
|
|
}
|
|
|
|
read_unlock(&em_tree->lock);
|
2012-10-01 16:07:15 +07:00
|
|
|
if (!em) {
|
2011-07-22 20:41:52 +07:00
|
|
|
kfree(failrec);
|
|
|
|
return -EIO;
|
|
|
|
}
|
2014-09-12 17:43:59 +07:00
|
|
|
|
2011-07-22 20:41:52 +07:00
|
|
|
logical = start - em->start;
|
|
|
|
logical = em->block_start + logical;
|
|
|
|
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
|
|
|
|
logical = em->block_start;
|
|
|
|
failrec->bio_flags = EXTENT_BIO_COMPRESSED;
|
|
|
|
extent_set_compress_type(&failrec->bio_flags,
|
|
|
|
em->compress_type);
|
|
|
|
}
|
2014-09-12 17:43:59 +07:00
|
|
|
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu",
|
|
|
|
logical, start, failrec->len);
|
2014-09-12 17:43:59 +07:00
|
|
|
|
2011-07-22 20:41:52 +07:00
|
|
|
failrec->logical = logical;
|
|
|
|
free_extent_map(em);
|
|
|
|
|
|
|
|
/* set the bits in the private failure tree */
|
|
|
|
ret = set_extent_bits(failure_tree, start, end,
|
2016-04-27 04:54:39 +07:00
|
|
|
EXTENT_LOCKED | EXTENT_DIRTY);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (ret >= 0)
|
2016-02-11 19:24:13 +07:00
|
|
|
ret = set_state_failrec(failure_tree, start, failrec);
|
2011-07-22 20:41:52 +07:00
|
|
|
/* set the bits in the inode's tree */
|
|
|
|
if (ret >= 0)
|
2016-04-27 04:54:39 +07:00
|
|
|
ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (ret < 0) {
|
|
|
|
kfree(failrec);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
} else {
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d",
|
|
|
|
failrec->logical, failrec->start, failrec->len,
|
|
|
|
failrec->in_validation);
|
2011-07-22 20:41:52 +07:00
|
|
|
/*
|
|
|
|
* when data can be on disk more than twice, add to failrec here
|
|
|
|
* (e.g. with a list for failed_mirror) to make
|
|
|
|
* clean_io_failure() clean all those errors at once.
|
|
|
|
*/
|
|
|
|
}
|
2014-09-12 17:43:59 +07:00
|
|
|
|
|
|
|
*failrec_ret = failrec;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-07-14 05:00:50 +07:00
|
|
|
bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
|
2014-09-12 17:43:59 +07:00
|
|
|
struct io_failure_record *failrec, int failed_mirror)
|
|
|
|
{
|
2016-09-20 21:05:02 +07:00
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
2014-09-12 17:43:59 +07:00
|
|
|
int num_copies;
|
|
|
|
|
2016-09-20 21:05:02 +07:00
|
|
|
num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len);
|
2011-07-22 20:41:52 +07:00
|
|
|
if (num_copies == 1) {
|
|
|
|
/*
|
|
|
|
* we only have a single copy of the data, so don't bother with
|
|
|
|
* all the retry and error correction code that follows. no
|
|
|
|
* matter what the error is, it is very likely to persist.
|
|
|
|
*/
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d",
|
|
|
|
num_copies, failrec->this_mirror, failed_mirror);
|
2017-07-14 05:00:50 +07:00
|
|
|
return false;
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* there are two premises:
|
|
|
|
* a) deliver good data to the caller
|
|
|
|
* b) correct the bad sectors on disk
|
|
|
|
*/
|
|
|
|
if (failed_bio->bi_vcnt > 1) {
|
|
|
|
/*
|
|
|
|
* to fulfill b), we need to know the exact failing sectors, as
|
|
|
|
* we don't want to rewrite any more than the failed ones. thus,
|
|
|
|
* we need separate read requests for the failed bio
|
|
|
|
*
|
|
|
|
* if the following BUG_ON triggers, our validation request got
|
|
|
|
* merged. we need separate requests for our algorithm to work.
|
|
|
|
*/
|
|
|
|
BUG_ON(failrec->in_validation);
|
|
|
|
failrec->in_validation = 1;
|
|
|
|
failrec->this_mirror = failed_mirror;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* we're ready to fulfill a) and b) alongside. get a good copy
|
|
|
|
* of the failed sector and if we succeed, we have setup
|
|
|
|
* everything for repair_io_failure to do the rest for us.
|
|
|
|
*/
|
|
|
|
if (failrec->in_validation) {
|
|
|
|
BUG_ON(failrec->this_mirror != failed_mirror);
|
|
|
|
failrec->in_validation = 0;
|
|
|
|
failrec->this_mirror = 0;
|
|
|
|
}
|
|
|
|
failrec->failed_mirror = failed_mirror;
|
|
|
|
failrec->this_mirror++;
|
|
|
|
if (failrec->this_mirror == failed_mirror)
|
|
|
|
failrec->this_mirror++;
|
|
|
|
}
|
|
|
|
|
2013-07-25 18:22:34 +07:00
|
|
|
if (failrec->this_mirror > num_copies) {
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d",
|
|
|
|
num_copies, failrec->this_mirror, failed_mirror);
|
2017-07-14 05:00:50 +07:00
|
|
|
return false;
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
|
|
|
|
2017-07-14 05:00:50 +07:00
|
|
|
return true;
|
2014-09-12 17:43:59 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
|
|
|
|
struct io_failure_record *failrec,
|
|
|
|
struct page *page, int pg_offset, int icsum,
|
2014-09-12 17:44:03 +07:00
|
|
|
bio_end_io_t *endio_func, void *data)
|
2014-09-12 17:43:59 +07:00
|
|
|
{
|
2016-06-23 05:54:23 +07:00
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
2014-09-12 17:43:59 +07:00
|
|
|
struct bio *bio;
|
|
|
|
struct btrfs_io_bio *btrfs_failed_bio;
|
|
|
|
struct btrfs_io_bio *btrfs_bio;
|
|
|
|
|
2017-06-12 22:29:41 +07:00
|
|
|
bio = btrfs_io_bio_alloc(1);
|
2014-09-12 17:43:59 +07:00
|
|
|
bio->bi_end_io = endio_func;
|
2013-10-12 05:44:27 +07:00
|
|
|
bio->bi_iter.bi_sector = failrec->logical >> 9;
|
2017-08-24 00:10:32 +07:00
|
|
|
bio_set_dev(bio, fs_info->fs_devices->latest_bdev);
|
2013-10-12 05:44:27 +07:00
|
|
|
bio->bi_iter.bi_size = 0;
|
2014-09-12 17:44:03 +07:00
|
|
|
bio->bi_private = data;
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2013-07-25 18:22:34 +07:00
|
|
|
btrfs_failed_bio = btrfs_io_bio(failed_bio);
|
|
|
|
if (btrfs_failed_bio->csum) {
|
|
|
|
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
|
|
|
|
|
|
btrfs_bio = btrfs_io_bio(bio);
|
|
|
|
btrfs_bio->csum = btrfs_bio->csum_inline;
|
2014-09-12 17:43:59 +07:00
|
|
|
icsum *= csum_size;
|
|
|
|
memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum,
|
2013-07-25 18:22:34 +07:00
|
|
|
csum_size);
|
|
|
|
}
|
|
|
|
|
2014-09-12 17:43:59 +07:00
|
|
|
bio_add_page(bio, page, failrec->len, pg_offset);
|
|
|
|
|
|
|
|
return bio;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this is a generic handler for readpage errors (default
|
|
|
|
* readpage_io_failed_hook). if other copies exist, read those and write back
|
|
|
|
* good data to the failed position. does not investigate in remapping the
|
|
|
|
* failed extent elsewhere, hoping the device will be smart enough to do this as
|
|
|
|
* needed
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
|
|
|
|
struct page *page, u64 start, u64 end,
|
|
|
|
int failed_mirror)
|
|
|
|
{
|
|
|
|
struct io_failure_record *failrec;
|
|
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
|
2017-05-05 22:57:15 +07:00
|
|
|
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
|
2014-09-12 17:43:59 +07:00
|
|
|
struct bio *bio;
|
2016-11-01 20:40:10 +07:00
|
|
|
int read_mode = 0;
|
2017-06-03 14:38:06 +07:00
|
|
|
blk_status_t status;
|
2014-09-12 17:43:59 +07:00
|
|
|
int ret;
|
|
|
|
|
2016-06-06 02:31:51 +07:00
|
|
|
BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
|
2014-09-12 17:43:59 +07:00
|
|
|
|
|
|
|
ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2017-07-14 05:00:50 +07:00
|
|
|
if (!btrfs_check_repairable(inode, failed_bio, failrec,
|
|
|
|
failed_mirror)) {
|
2017-05-05 22:57:15 +07:00
|
|
|
free_io_failure(failure_tree, tree, failrec);
|
2014-09-12 17:43:59 +07:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (failed_bio->bi_vcnt > 1)
|
2016-11-01 20:40:10 +07:00
|
|
|
read_mode |= REQ_FAILFAST_DEV;
|
2014-09-12 17:43:59 +07:00
|
|
|
|
|
|
|
phy_offset >>= inode->i_sb->s_blocksize_bits;
|
|
|
|
bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page,
|
|
|
|
start - page_offset(page),
|
2014-09-12 17:44:03 +07:00
|
|
|
(int)phy_offset, failed_bio->bi_end_io,
|
|
|
|
NULL);
|
2016-06-06 02:31:51 +07:00
|
|
|
bio_set_op_attrs(bio, REQ_OP_READ, read_mode);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(btrfs_sb(inode->i_sb),
|
|
|
|
"Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d",
|
|
|
|
read_mode, failrec->this_mirror, failrec->in_validation);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2017-07-06 06:41:23 +07:00
|
|
|
status = tree->ops->submit_bio_hook(tree->private_data, bio, failrec->this_mirror,
|
2012-02-16 08:11:40 +07:00
|
|
|
failrec->bio_flags, 0);
|
2017-06-03 14:38:06 +07:00
|
|
|
if (status) {
|
2017-05-05 22:57:15 +07:00
|
|
|
free_io_failure(failure_tree, tree, failrec);
|
2014-09-12 17:43:57 +07:00
|
|
|
bio_put(bio);
|
2017-06-03 14:38:06 +07:00
|
|
|
ret = blk_status_to_errno(status);
|
2014-09-12 17:43:57 +07:00
|
|
|
}
|
|
|
|
|
2012-02-16 08:11:40 +07:00
|
|
|
return ret;
|
2011-07-22 20:41:52 +07:00
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/* lots and lots of room for performance fixes in the end_bio funcs */
|
|
|
|
|
2015-12-03 19:08:59 +07:00
|
|
|
void end_extent_writepage(struct page *page, int err, u64 start, u64 end)
|
2012-02-15 22:23:57 +07:00
|
|
|
{
|
|
|
|
int uptodate = (err == 0);
|
|
|
|
struct extent_io_tree *tree;
|
2014-06-12 12:39:58 +07:00
|
|
|
int ret = 0;
|
2012-02-15 22:23:57 +07:00
|
|
|
|
|
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
|
|
|
2017-02-17 21:18:32 +07:00
|
|
|
if (tree->ops && tree->ops->writepage_end_io_hook)
|
|
|
|
tree->ops->writepage_end_io_hook(page, start, end, NULL,
|
|
|
|
uptodate);
|
2012-02-15 22:23:57 +07:00
|
|
|
|
|
|
|
if (!uptodate) {
|
|
|
|
ClearPageUptodate(page);
|
|
|
|
SetPageError(page);
|
2017-05-10 00:14:01 +07:00
|
|
|
ret = err < 0 ? err : -EIO;
|
2014-05-12 11:47:36 +07:00
|
|
|
mapping_set_error(page->mapping, ret);
|
2012-02-15 22:23:57 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* after a writepage IO is done, we need to:
|
|
|
|
* clear the uptodate bits on error
|
|
|
|
* clear the writeback bits in the extent tree for this IO
|
|
|
|
* end_page_writeback if the page has no more pending IO
|
|
|
|
*
|
|
|
|
* Scheduling is not allowed, so the extent state tree is expected
|
|
|
|
* to have one and only one object corresponding to this IO.
|
|
|
|
*/
|
2015-07-20 20:29:37 +07:00
|
|
|
static void end_bio_extent_writepage(struct bio *bio)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2017-06-03 14:38:06 +07:00
|
|
|
int error = blk_status_to_errno(bio->bi_status);
|
2013-11-08 03:20:26 +07:00
|
|
|
struct bio_vec *bvec;
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 start;
|
|
|
|
u64 end;
|
2013-11-08 03:20:26 +07:00
|
|
|
int i;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2017-07-13 23:10:07 +07:00
|
|
|
ASSERT(!bio_flagged(bio, BIO_CLONED));
|
2013-11-08 03:20:26 +07:00
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
2008-01-25 04:13:08 +07:00
|
|
|
struct page *page = bvec->bv_page;
|
2016-06-23 05:54:23 +07:00
|
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
2008-08-20 19:51:49 +07:00
|
|
|
|
2013-05-15 22:38:55 +07:00
|
|
|
/* We always issue full-page reads, but if some block
|
|
|
|
* in a page fails to read, blk_update_request() will
|
|
|
|
* advance bv_offset and adjust bv_len to compensate.
|
|
|
|
* Print a warning for nonzero offsets, and an error
|
|
|
|
* if they don't add up to a full page. */
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) {
|
|
|
|
if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE)
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_err(fs_info,
|
2013-12-20 23:37:06 +07:00
|
|
|
"partial page write in btrfs with offset %u and length %u",
|
|
|
|
bvec->bv_offset, bvec->bv_len);
|
|
|
|
else
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_info(fs_info,
|
2016-09-20 21:05:00 +07:00
|
|
|
"incomplete page write in btrfs with offset %u and length %u",
|
2013-12-20 23:37:06 +07:00
|
|
|
bvec->bv_offset, bvec->bv_len);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-05-15 22:38:55 +07:00
|
|
|
start = page_offset(page);
|
|
|
|
end = start + bvec->bv_offset + bvec->bv_len - 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2017-06-03 14:38:06 +07:00
|
|
|
end_extent_writepage(page, error, start, end);
|
2013-05-15 22:38:55 +07:00
|
|
|
end_page_writeback(page);
|
2013-11-08 03:20:26 +07:00
|
|
|
}
|
2008-09-24 22:48:04 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
bio_put(bio);
|
|
|
|
}
|
|
|
|
|
2013-07-25 18:22:35 +07:00
|
|
|
static void
|
|
|
|
endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len,
|
|
|
|
int uptodate)
|
|
|
|
{
|
|
|
|
struct extent_state *cached = NULL;
|
|
|
|
u64 end = start + len - 1;
|
|
|
|
|
|
|
|
if (uptodate && tree->track_uptodate)
|
|
|
|
set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC);
|
|
|
|
unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* after a readpage IO is done, we need to:
|
|
|
|
* clear the uptodate bits on error
|
|
|
|
* set the uptodate bits if things worked
|
|
|
|
* set the page up to date if all extents in the tree are uptodate
|
|
|
|
* clear the lock bit in the extent tree
|
|
|
|
* unlock the page if there are no other extents locked for it
|
|
|
|
*
|
|
|
|
* Scheduling is not allowed, so the extent state tree is expected
|
|
|
|
* to have one and only one object corresponding to this IO.
|
|
|
|
*/
|
2015-07-20 20:29:37 +07:00
|
|
|
static void end_bio_extent_readpage(struct bio *bio)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2013-11-08 03:20:26 +07:00
|
|
|
struct bio_vec *bvec;
|
2017-06-03 14:38:06 +07:00
|
|
|
int uptodate = !bio->bi_status;
|
2013-07-25 18:22:34 +07:00
|
|
|
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
|
2017-05-05 22:57:15 +07:00
|
|
|
struct extent_io_tree *tree, *failure_tree;
|
2013-07-25 18:22:34 +07:00
|
|
|
u64 offset = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 start;
|
|
|
|
u64 end;
|
2013-07-25 18:22:34 +07:00
|
|
|
u64 len;
|
2013-07-25 18:22:35 +07:00
|
|
|
u64 extent_start = 0;
|
|
|
|
u64 extent_len = 0;
|
2012-04-16 20:42:26 +07:00
|
|
|
int mirror;
|
2008-01-25 04:13:08 +07:00
|
|
|
int ret;
|
2013-11-08 03:20:26 +07:00
|
|
|
int i;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2017-07-13 23:10:07 +07:00
|
|
|
ASSERT(!bio_flagged(bio, BIO_CLONED));
|
2013-11-08 03:20:26 +07:00
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
2008-01-25 04:13:08 +07:00
|
|
|
struct page *page = bvec->bv_page;
|
2013-06-18 04:14:39 +07:00
|
|
|
struct inode *inode = page->mapping->host;
|
2016-09-20 21:05:02 +07:00
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
2011-04-06 17:02:20 +07:00
|
|
|
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_debug(fs_info,
|
|
|
|
"end_bio_extent_readpage: bi_sector=%llu, err=%d, mirror=%u",
|
2017-06-03 14:38:06 +07:00
|
|
|
(u64)bio->bi_iter.bi_sector, bio->bi_status,
|
2016-09-20 21:05:02 +07:00
|
|
|
io_bio->mirror_num);
|
2013-06-18 04:14:39 +07:00
|
|
|
tree = &BTRFS_I(inode)->io_tree;
|
2017-05-05 22:57:15 +07:00
|
|
|
failure_tree = &BTRFS_I(inode)->io_failure_tree;
|
2008-08-20 19:51:49 +07:00
|
|
|
|
2013-05-15 22:38:55 +07:00
|
|
|
/* We always issue full-page reads, but if some block
|
|
|
|
* in a page fails to read, blk_update_request() will
|
|
|
|
* advance bv_offset and adjust bv_len to compensate.
|
|
|
|
* Print a warning for nonzero offsets, and an error
|
|
|
|
* if they don't add up to a full page. */
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) {
|
|
|
|
if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE)
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_err(fs_info,
|
|
|
|
"partial page read in btrfs with offset %u and length %u",
|
2013-12-20 23:37:06 +07:00
|
|
|
bvec->bv_offset, bvec->bv_len);
|
|
|
|
else
|
2016-09-20 21:05:02 +07:00
|
|
|
btrfs_info(fs_info,
|
|
|
|
"incomplete page read in btrfs with offset %u and length %u",
|
2013-12-20 23:37:06 +07:00
|
|
|
bvec->bv_offset, bvec->bv_len);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-05-15 22:38:55 +07:00
|
|
|
start = page_offset(page);
|
|
|
|
end = start + bvec->bv_offset + bvec->bv_len - 1;
|
2013-07-25 18:22:34 +07:00
|
|
|
len = bvec->bv_len;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-05-18 05:30:14 +07:00
|
|
|
mirror = io_bio->mirror_num;
|
2017-02-17 21:59:35 +07:00
|
|
|
if (likely(uptodate && tree->ops)) {
|
2013-07-25 18:22:34 +07:00
|
|
|
ret = tree->ops->readpage_end_io_hook(io_bio, offset,
|
|
|
|
page, start, end,
|
|
|
|
mirror);
|
2012-08-27 21:30:03 +07:00
|
|
|
if (ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
uptodate = 0;
|
2012-08-27 21:30:03 +07:00
|
|
|
else
|
2017-05-05 22:57:15 +07:00
|
|
|
clean_io_failure(BTRFS_I(inode)->root->fs_info,
|
|
|
|
failure_tree, tree, start,
|
|
|
|
page,
|
|
|
|
btrfs_ino(BTRFS_I(inode)), 0);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2012-03-27 08:57:36 +07:00
|
|
|
|
2013-07-25 18:22:33 +07:00
|
|
|
if (likely(uptodate))
|
|
|
|
goto readpage_ok;
|
|
|
|
|
2017-02-17 22:24:29 +07:00
|
|
|
if (tree->ops) {
|
2012-04-16 20:42:26 +07:00
|
|
|
ret = tree->ops->readpage_io_failed_hook(page, mirror);
|
2017-03-25 05:04:50 +07:00
|
|
|
if (ret == -EAGAIN) {
|
|
|
|
/*
|
|
|
|
* Data inode's readpage_io_failed_hook() always
|
|
|
|
* returns -EAGAIN.
|
|
|
|
*
|
|
|
|
* The generic bio_readpage_error handles errors
|
|
|
|
* the following way: If possible, new read
|
|
|
|
* requests are created and submitted and will
|
|
|
|
* end up in end_bio_extent_readpage as well (if
|
|
|
|
* we're lucky, not in the !uptodate case). In
|
|
|
|
* that case it returns 0 and we just go on with
|
|
|
|
* the next page in our bio. If it can't handle
|
|
|
|
* the error it will return -EIO and we remain
|
|
|
|
* responsible for that page.
|
|
|
|
*/
|
|
|
|
ret = bio_readpage_error(bio, offset, page,
|
|
|
|
start, end, mirror);
|
|
|
|
if (ret == 0) {
|
2017-06-03 14:38:06 +07:00
|
|
|
uptodate = !bio->bi_status;
|
2017-03-25 05:04:50 +07:00
|
|
|
offset += len;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-12-01 21:30:36 +07:00
|
|
|
/*
|
2017-03-25 05:04:50 +07:00
|
|
|
* metadata's readpage_io_failed_hook() always returns
|
|
|
|
* -EIO and fixes nothing. -EIO is also returned if
|
|
|
|
* data inode error could not be fixed.
|
2011-12-01 21:30:36 +07:00
|
|
|
*/
|
2017-03-25 05:04:50 +07:00
|
|
|
ASSERT(ret == -EIO);
|
2008-04-10 03:28:12 +07:00
|
|
|
}
|
2013-07-25 18:22:33 +07:00
|
|
|
readpage_ok:
|
2013-07-25 18:22:35 +07:00
|
|
|
if (likely(uptodate)) {
|
2013-06-18 04:14:39 +07:00
|
|
|
loff_t i_size = i_size_read(inode);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
pgoff_t end_index = i_size >> PAGE_SHIFT;
|
2014-08-19 22:32:22 +07:00
|
|
|
unsigned off;
|
2013-06-18 04:14:39 +07:00
|
|
|
|
|
|
|
/* Zero out the end if this page straddles i_size */
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
off = i_size & (PAGE_SIZE-1);
|
2014-08-19 22:32:22 +07:00
|
|
|
if (page->index == end_index && off)
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
zero_user_segment(page, off, PAGE_SIZE);
|
2013-05-15 22:38:55 +07:00
|
|
|
SetPageUptodate(page);
|
2008-01-29 21:59:12 +07:00
|
|
|
} else {
|
2013-05-15 22:38:55 +07:00
|
|
|
ClearPageUptodate(page);
|
|
|
|
SetPageError(page);
|
2008-01-29 21:59:12 +07:00
|
|
|
}
|
2013-05-15 22:38:55 +07:00
|
|
|
unlock_page(page);
|
2013-07-25 18:22:34 +07:00
|
|
|
offset += len;
|
2013-07-25 18:22:35 +07:00
|
|
|
|
|
|
|
if (unlikely(!uptodate)) {
|
|
|
|
if (extent_len) {
|
|
|
|
endio_readpage_release_extent(tree,
|
|
|
|
extent_start,
|
|
|
|
extent_len, 1);
|
|
|
|
extent_start = 0;
|
|
|
|
extent_len = 0;
|
|
|
|
}
|
|
|
|
endio_readpage_release_extent(tree, start,
|
|
|
|
end - start + 1, 0);
|
|
|
|
} else if (!extent_len) {
|
|
|
|
extent_start = start;
|
|
|
|
extent_len = end + 1 - start;
|
|
|
|
} else if (extent_start + extent_len == start) {
|
|
|
|
extent_len += end + 1 - start;
|
|
|
|
} else {
|
|
|
|
endio_readpage_release_extent(tree, extent_start,
|
|
|
|
extent_len, uptodate);
|
|
|
|
extent_start = start;
|
|
|
|
extent_len = end + 1 - start;
|
|
|
|
}
|
2013-11-08 03:20:26 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-07-25 18:22:35 +07:00
|
|
|
if (extent_len)
|
|
|
|
endio_readpage_release_extent(tree, extent_start, extent_len,
|
|
|
|
uptodate);
|
2013-07-25 18:22:34 +07:00
|
|
|
if (io_bio->end_io)
|
2017-06-03 14:38:06 +07:00
|
|
|
io_bio->end_io(io_bio, blk_status_to_errno(bio->bi_status));
|
2008-01-25 04:13:08 +07:00
|
|
|
bio_put(bio);
|
|
|
|
}
|
|
|
|
|
2013-05-18 05:30:14 +07:00
|
|
|
/*
|
2017-06-12 22:29:39 +07:00
|
|
|
* Initialize the members up to but not including 'bio'. Use after allocating a
|
|
|
|
* new bio by bio_alloc_bioset as it does not initialize the bytes outside of
|
|
|
|
* 'bio' because use of __GFP_ZERO is not supported.
|
2013-05-18 05:30:14 +07:00
|
|
|
*/
|
2017-06-12 22:29:39 +07:00
|
|
|
static inline void btrfs_io_bio_init(struct btrfs_io_bio *btrfs_bio)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2017-06-12 22:29:39 +07:00
|
|
|
memset(btrfs_bio, 0, offsetof(struct btrfs_io_bio, bio));
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2013-05-18 05:30:14 +07:00
|
|
|
/*
|
2017-06-02 22:26:26 +07:00
|
|
|
* The following helpers allocate a bio. As it's backed by a bioset, it'll
|
|
|
|
* never fail. We're returning a bio right now but you can call btrfs_io_bio
|
|
|
|
* for the appropriate container_of magic
|
2013-05-18 05:30:14 +07:00
|
|
|
*/
|
2017-06-02 23:35:36 +07:00
|
|
|
struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct bio *bio;
|
|
|
|
|
2017-06-02 22:55:44 +07:00
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, btrfs_bioset);
|
2017-08-24 00:10:32 +07:00
|
|
|
bio_set_dev(bio, bdev);
|
2017-06-02 23:35:36 +07:00
|
|
|
bio->bi_iter.bi_sector = first_byte >> 9;
|
2017-06-12 22:29:39 +07:00
|
|
|
btrfs_io_bio_init(btrfs_io_bio(bio));
|
2008-01-25 04:13:08 +07:00
|
|
|
return bio;
|
|
|
|
}
|
|
|
|
|
2017-06-02 22:48:13 +07:00
|
|
|
struct bio *btrfs_bio_clone(struct bio *bio)
|
2013-05-18 05:30:14 +07:00
|
|
|
{
|
2014-09-12 17:43:54 +07:00
|
|
|
struct btrfs_io_bio *btrfs_bio;
|
|
|
|
struct bio *new;
|
2013-05-18 05:30:14 +07:00
|
|
|
|
2017-06-02 22:26:26 +07:00
|
|
|
/* Bio allocation backed by a bioset does not fail */
|
2017-06-02 22:48:13 +07:00
|
|
|
new = bio_clone_fast(bio, GFP_NOFS, btrfs_bioset);
|
2017-06-02 22:26:26 +07:00
|
|
|
btrfs_bio = btrfs_io_bio(new);
|
2017-06-12 22:29:39 +07:00
|
|
|
btrfs_io_bio_init(btrfs_bio);
|
2017-06-02 22:26:26 +07:00
|
|
|
btrfs_bio->iter = bio->bi_iter;
|
2014-09-12 17:43:54 +07:00
|
|
|
return new;
|
|
|
|
}
|
2013-05-18 05:30:14 +07:00
|
|
|
|
2017-06-12 22:29:41 +07:00
|
|
|
struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs)
|
2013-05-18 05:30:14 +07:00
|
|
|
{
|
2013-07-25 18:22:34 +07:00
|
|
|
struct bio *bio;
|
|
|
|
|
2017-06-02 22:26:26 +07:00
|
|
|
/* Bio allocation backed by a bioset does not fail */
|
2017-06-12 22:29:41 +07:00
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, nr_iovecs, btrfs_bioset);
|
2017-06-12 22:29:39 +07:00
|
|
|
btrfs_io_bio_init(btrfs_io_bio(bio));
|
2013-07-25 18:22:34 +07:00
|
|
|
return bio;
|
2013-05-18 05:30:14 +07:00
|
|
|
}
|
|
|
|
|
2017-05-17 00:57:14 +07:00
|
|
|
struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size)
|
2017-05-16 07:43:31 +07:00
|
|
|
{
|
|
|
|
struct bio *bio;
|
|
|
|
struct btrfs_io_bio *btrfs_bio;
|
|
|
|
|
|
|
|
/* this will never fail when it's backed by a bioset */
|
2017-05-17 00:57:14 +07:00
|
|
|
bio = bio_clone_fast(orig, GFP_NOFS, btrfs_bioset);
|
2017-05-16 07:43:31 +07:00
|
|
|
ASSERT(bio);
|
|
|
|
|
|
|
|
btrfs_bio = btrfs_io_bio(bio);
|
2017-06-12 22:29:39 +07:00
|
|
|
btrfs_io_bio_init(btrfs_bio);
|
2017-05-16 07:43:31 +07:00
|
|
|
|
|
|
|
bio_trim(bio, offset >> 9, size >> 9);
|
2017-05-16 05:33:27 +07:00
|
|
|
btrfs_bio->iter = bio->bi_iter;
|
2017-05-16 07:43:31 +07:00
|
|
|
return bio;
|
|
|
|
}
|
2013-05-18 05:30:14 +07:00
|
|
|
|
2016-06-06 02:31:51 +07:00
|
|
|
static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
|
|
|
|
unsigned long bio_flags)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2017-06-03 14:38:06 +07:00
|
|
|
blk_status_t ret = 0;
|
2008-01-29 21:59:12 +07:00
|
|
|
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
|
|
|
|
struct page *page = bvec->bv_page;
|
|
|
|
struct extent_io_tree *tree = bio->bi_private;
|
|
|
|
u64 start;
|
|
|
|
|
2012-12-21 16:17:45 +07:00
|
|
|
start = page_offset(page) + bvec->bv_offset;
|
2008-01-29 21:59:12 +07:00
|
|
|
|
2008-08-20 19:51:49 +07:00
|
|
|
bio->bi_private = NULL;
|
2008-01-25 04:13:08 +07:00
|
|
|
bio_get(bio);
|
|
|
|
|
2017-02-17 21:59:35 +07:00
|
|
|
if (tree->ops)
|
2017-05-05 22:57:13 +07:00
|
|
|
ret = tree->ops->submit_bio_hook(tree->private_data, bio,
|
2010-05-25 20:48:28 +07:00
|
|
|
mirror_num, bio_flags, start);
|
2008-03-25 02:01:56 +07:00
|
|
|
else
|
2016-06-06 02:31:41 +07:00
|
|
|
btrfsic_submit_bio(bio);
|
2011-07-22 20:41:52 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
bio_put(bio);
|
2017-06-03 14:38:06 +07:00
|
|
|
return blk_status_to_errno(ret);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2016-06-06 02:31:51 +07:00
|
|
|
static int merge_bio(struct extent_io_tree *tree, struct page *page,
|
2011-10-04 10:23:13 +07:00
|
|
|
unsigned long offset, size_t size, struct bio *bio,
|
|
|
|
unsigned long bio_flags)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
2017-02-17 21:59:35 +07:00
|
|
|
if (tree->ops)
|
2016-06-06 02:31:54 +07:00
|
|
|
ret = tree->ops->merge_bio_hook(page, offset, size, bio,
|
2011-10-04 10:23:13 +07:00
|
|
|
bio_flags);
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2017-06-07 00:14:26 +07:00
|
|
|
/*
|
|
|
|
* @opf: bio REQ_OP_* and REQ_* flags as one value
|
|
|
|
*/
|
|
|
|
static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
|
2015-07-03 03:57:22 +07:00
|
|
|
struct writeback_control *wbc,
|
2017-10-04 22:30:11 +07:00
|
|
|
struct page *page, u64 offset,
|
2017-10-04 22:10:34 +07:00
|
|
|
size_t size, unsigned long pg_offset,
|
2008-01-25 04:13:08 +07:00
|
|
|
struct block_device *bdev,
|
|
|
|
struct bio **bio_ret,
|
2008-04-10 03:28:12 +07:00
|
|
|
bio_end_io_t end_io_func,
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
int mirror_num,
|
|
|
|
unsigned long prev_bio_flags,
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
unsigned long bio_flags,
|
|
|
|
bool force_bio_submit)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
struct bio *bio;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
int contig = 0;
|
|
|
|
int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t page_size = min_t(size_t, size, PAGE_SIZE);
|
2017-10-04 22:30:11 +07:00
|
|
|
sector_t sector = offset >> 9;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
if (bio_ret && *bio_ret) {
|
|
|
|
bio = *bio_ret;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (old_compressed)
|
2013-10-12 05:44:27 +07:00
|
|
|
contig = bio->bi_iter.bi_sector == sector;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
else
|
2012-09-26 05:05:12 +07:00
|
|
|
contig = bio_end_sector(bio) == sector;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
|
|
|
if (prev_bio_flags != bio_flags || !contig ||
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
force_bio_submit ||
|
2017-10-04 22:10:34 +07:00
|
|
|
merge_bio(tree, page, pg_offset, page_size, bio, bio_flags) ||
|
|
|
|
bio_add_page(bio, page, page_size, pg_offset) < page_size) {
|
2016-06-06 02:31:51 +07:00
|
|
|
ret = submit_one_bio(bio, mirror_num, prev_bio_flags);
|
2015-01-05 23:01:03 +07:00
|
|
|
if (ret < 0) {
|
|
|
|
*bio_ret = NULL;
|
2012-03-12 22:03:00 +07:00
|
|
|
return ret;
|
2015-01-05 23:01:03 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
bio = NULL;
|
|
|
|
} else {
|
2015-07-03 03:57:22 +07:00
|
|
|
if (wbc)
|
|
|
|
wbc_account_io(wbc, page, page_size);
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2017-10-04 22:30:11 +07:00
|
|
|
bio = btrfs_bio_alloc(bdev, offset);
|
2017-10-04 22:10:34 +07:00
|
|
|
bio_add_page(bio, page, page_size, pg_offset);
|
2008-01-25 04:13:08 +07:00
|
|
|
bio->bi_end_io = end_io_func;
|
|
|
|
bio->bi_private = tree;
|
2017-06-28 00:51:28 +07:00
|
|
|
bio->bi_write_hint = page->mapping->host->i_write_hint;
|
2017-06-07 00:14:26 +07:00
|
|
|
bio->bi_opf = opf;
|
2015-07-03 03:57:22 +07:00
|
|
|
if (wbc) {
|
|
|
|
wbc_init_bio(wbc, bio);
|
|
|
|
wbc_account_io(wbc, page, page_size);
|
|
|
|
}
|
2008-01-29 21:59:12 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
if (bio_ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
*bio_ret = bio;
|
2009-01-06 09:25:51 +07:00
|
|
|
else
|
2016-06-06 02:31:51 +07:00
|
|
|
ret = submit_one_bio(bio, mirror_num, bio_flags);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-04-26 03:41:01 +07:00
|
|
|
static void attach_extent_buffer_page(struct extent_buffer *eb,
|
|
|
|
struct page *page)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
if (!PagePrivate(page)) {
|
|
|
|
SetPagePrivate(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
get_page(page);
|
2012-03-08 04:20:05 +07:00
|
|
|
set_page_private(page, (unsigned long)eb);
|
|
|
|
} else {
|
|
|
|
WARN_ON(page->private != (unsigned long)eb);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-03-08 04:20:05 +07:00
|
|
|
void set_page_extent_mapped(struct page *page)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2012-03-08 04:20:05 +07:00
|
|
|
if (!PagePrivate(page)) {
|
|
|
|
SetPagePrivate(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
get_page(page);
|
2012-03-08 04:20:05 +07:00
|
|
|
set_page_private(page, EXTENT_PAGE_PRIVATE);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2013-07-25 18:22:37 +07:00
|
|
|
static struct extent_map *
|
|
|
|
__get_extent_map(struct inode *inode, struct page *page, size_t pg_offset,
|
|
|
|
u64 start, u64 len, get_extent_t *get_extent,
|
|
|
|
struct extent_map **em_cached)
|
|
|
|
{
|
|
|
|
struct extent_map *em;
|
|
|
|
|
|
|
|
if (em_cached && *em_cached) {
|
|
|
|
em = *em_cached;
|
2014-02-25 21:15:12 +07:00
|
|
|
if (extent_map_in_tree(em) && start >= em->start &&
|
2013-07-25 18:22:37 +07:00
|
|
|
start < extent_map_end(em)) {
|
2017-03-03 15:55:12 +07:00
|
|
|
refcount_inc(&em->refs);
|
2013-07-25 18:22:37 +07:00
|
|
|
return em;
|
|
|
|
}
|
|
|
|
|
|
|
|
free_extent_map(em);
|
|
|
|
*em_cached = NULL;
|
|
|
|
}
|
|
|
|
|
2017-02-20 18:51:06 +07:00
|
|
|
em = get_extent(BTRFS_I(inode), page, pg_offset, start, len, 0);
|
2013-07-25 18:22:37 +07:00
|
|
|
if (em_cached && !IS_ERR_OR_NULL(em)) {
|
|
|
|
BUG_ON(*em_cached);
|
2017-03-03 15:55:12 +07:00
|
|
|
refcount_inc(&em->refs);
|
2013-07-25 18:22:37 +07:00
|
|
|
*em_cached = em;
|
|
|
|
}
|
|
|
|
return em;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* basic readpage implementation. Locked extent state structs are inserted
|
|
|
|
* into the tree that are removed when the IO is done (by the end_io
|
|
|
|
* handlers)
|
2012-03-12 22:03:00 +07:00
|
|
|
* XXX JDM: This needs looking at to ensure proper page locking
|
2016-07-12 00:39:07 +07:00
|
|
|
* return 0 on success, otherwise return error
|
2008-01-25 04:13:08 +07:00
|
|
|
*/
|
2013-07-25 18:22:36 +07:00
|
|
|
static int __do_readpage(struct extent_io_tree *tree,
|
|
|
|
struct page *page,
|
|
|
|
get_extent_t *get_extent,
|
2013-07-25 18:22:37 +07:00
|
|
|
struct extent_map **em_cached,
|
2013-07-25 18:22:36 +07:00
|
|
|
struct bio **bio, int mirror_num,
|
2017-06-07 00:03:49 +07:00
|
|
|
unsigned long *bio_flags, unsigned int read_flags,
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
u64 *prev_em_start)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct inode *inode = page->mapping->host;
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 page_end = start + PAGE_SIZE - 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 end;
|
|
|
|
u64 cur = start;
|
|
|
|
u64 extent_offset;
|
|
|
|
u64 last_byte = i_size_read(inode);
|
|
|
|
u64 block_start;
|
|
|
|
u64 cur_end;
|
|
|
|
struct extent_map *em;
|
|
|
|
struct block_device *bdev;
|
2016-07-12 00:39:07 +07:00
|
|
|
int ret = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
int nr = 0;
|
2011-04-19 19:29:38 +07:00
|
|
|
size_t pg_offset = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t iosize;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
size_t disk_io_size;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t blocksize = inode->i_sb->s_blocksize;
|
2016-01-28 02:17:20 +07:00
|
|
|
unsigned long this_bio_flag = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
set_page_extent_mapped(page);
|
|
|
|
|
2013-07-25 18:22:36 +07:00
|
|
|
end = page_end;
|
2011-05-26 23:01:56 +07:00
|
|
|
if (!PageUptodate(page)) {
|
|
|
|
if (cleancache_get_page(page) == 0) {
|
|
|
|
BUG_ON(blocksize != PAGE_SIZE);
|
2013-07-25 18:22:36 +07:00
|
|
|
unlock_extent(tree, start, end);
|
2011-05-26 23:01:56 +07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
if (page->index == last_byte >> PAGE_SHIFT) {
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
char *userpage;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t zero_offset = last_byte & (PAGE_SIZE - 1);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
|
|
|
if (zero_offset) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
iosize = PAGE_SIZE - zero_offset;
|
2011-11-25 22:14:28 +07:00
|
|
|
userpage = kmap_atomic(page);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
memset(userpage + zero_offset, 0, iosize);
|
|
|
|
flush_dcache_page(page);
|
2011-11-25 22:14:28 +07:00
|
|
|
kunmap_atomic(userpage);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
}
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
while (cur <= end) {
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
bool force_bio_submit = false;
|
2017-10-04 22:30:11 +07:00
|
|
|
u64 offset;
|
2013-02-11 23:33:00 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
if (cur >= last_byte) {
|
|
|
|
char *userpage;
|
2011-04-06 17:02:20 +07:00
|
|
|
struct extent_state *cached = NULL;
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
iosize = PAGE_SIZE - pg_offset;
|
2011-11-25 22:14:28 +07:00
|
|
|
userpage = kmap_atomic(page);
|
2011-04-19 19:29:38 +07:00
|
|
|
memset(userpage + pg_offset, 0, iosize);
|
2008-01-25 04:13:08 +07:00
|
|
|
flush_dcache_page(page);
|
2011-11-25 22:14:28 +07:00
|
|
|
kunmap_atomic(userpage);
|
2008-01-25 04:13:08 +07:00
|
|
|
set_extent_uptodate(tree, cur, cur + iosize - 1,
|
2011-04-06 17:02:20 +07:00
|
|
|
&cached, GFP_NOFS);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent_cached(tree, cur,
|
|
|
|
cur + iosize - 1,
|
|
|
|
&cached, GFP_NOFS);
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
}
|
2013-07-25 18:22:37 +07:00
|
|
|
em = __get_extent_map(inode, page, pg_offset, cur,
|
|
|
|
end - cur + 1, get_extent, em_cached);
|
2011-04-19 23:00:01 +07:00
|
|
|
if (IS_ERR_OR_NULL(em)) {
|
2008-01-25 04:13:08 +07:00
|
|
|
SetPageError(page);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent(tree, cur, end);
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
extent_offset = cur - em->start;
|
|
|
|
BUG_ON(extent_map_end(em) <= cur);
|
|
|
|
BUG_ON(end < cur);
|
|
|
|
|
2010-12-17 13:21:50 +07:00
|
|
|
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
|
2013-08-07 01:42:50 +07:00
|
|
|
this_bio_flag |= EXTENT_BIO_COMPRESSED;
|
2010-12-17 13:21:50 +07:00
|
|
|
extent_set_compress_type(&this_bio_flag,
|
|
|
|
em->compress_type);
|
|
|
|
}
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
iosize = min(extent_map_end(em) - cur, end - cur + 1);
|
|
|
|
cur_end = min(extent_map_end(em) - 1, end);
|
2013-02-26 15:10:22 +07:00
|
|
|
iosize = ALIGN(iosize, blocksize);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
if (this_bio_flag & EXTENT_BIO_COMPRESSED) {
|
|
|
|
disk_io_size = em->block_len;
|
2017-10-04 22:30:11 +07:00
|
|
|
offset = em->block_start;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
} else {
|
2017-10-04 22:30:11 +07:00
|
|
|
offset = em->block_start + extent_offset;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
disk_io_size = iosize;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
bdev = em->bdev;
|
|
|
|
block_start = em->block_start;
|
2008-10-31 01:25:28 +07:00
|
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
|
|
block_start = EXTENT_MAP_HOLE;
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If we have a file range that points to a compressed extent
|
|
|
|
* and it's followed by a consecutive file range that points to
|
|
|
|
* to the same compressed extent (possibly with a different
|
|
|
|
* offset and/or length, so it either points to the whole extent
|
|
|
|
* or only part of it), we must make sure we do not submit a
|
|
|
|
* single bio to populate the pages for the 2 ranges because
|
|
|
|
* this makes the compressed extent read zero out the pages
|
|
|
|
* belonging to the 2nd range. Imagine the following scenario:
|
|
|
|
*
|
|
|
|
* File layout
|
|
|
|
* [0 - 8K] [8K - 24K]
|
|
|
|
* | |
|
|
|
|
* | |
|
|
|
|
* points to extent X, points to extent X,
|
|
|
|
* offset 4K, length of 8K offset 0, length 16K
|
|
|
|
*
|
|
|
|
* [extent X, compressed length = 4K uncompressed length = 16K]
|
|
|
|
*
|
|
|
|
* If the bio to read the compressed extent covers both ranges,
|
|
|
|
* it will decompress extent X into the pages belonging to the
|
|
|
|
* first range and then it will stop, zeroing out the remaining
|
|
|
|
* pages that belong to the other range that points to extent X.
|
|
|
|
* So here we make sure we submit 2 bios, one for the first
|
|
|
|
* range and another one for the third range. Both will target
|
|
|
|
* the same physical extent from disk, but we can't currently
|
|
|
|
* make the compressed bio endio callback populate the pages
|
|
|
|
* for both ranges because each compressed bio is tightly
|
|
|
|
* coupled with a single extent map, and each range can have
|
|
|
|
* an extent map with a different offset value relative to the
|
|
|
|
* uncompressed data of our extent and different lengths. This
|
|
|
|
* is a corner case so we prioritize correctness over
|
|
|
|
* non-optimal behavior (submitting 2 bios for the same extent).
|
|
|
|
*/
|
|
|
|
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) &&
|
|
|
|
prev_em_start && *prev_em_start != (u64)-1 &&
|
|
|
|
*prev_em_start != em->orig_start)
|
|
|
|
force_bio_submit = true;
|
|
|
|
|
|
|
|
if (prev_em_start)
|
|
|
|
*prev_em_start = em->orig_start;
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
em = NULL;
|
|
|
|
|
|
|
|
/* we've found a hole, just zero and go on */
|
|
|
|
if (block_start == EXTENT_MAP_HOLE) {
|
|
|
|
char *userpage;
|
2011-04-06 17:02:20 +07:00
|
|
|
struct extent_state *cached = NULL;
|
|
|
|
|
2011-11-25 22:14:28 +07:00
|
|
|
userpage = kmap_atomic(page);
|
2011-04-19 19:29:38 +07:00
|
|
|
memset(userpage + pg_offset, 0, iosize);
|
2008-01-25 04:13:08 +07:00
|
|
|
flush_dcache_page(page);
|
2011-11-25 22:14:28 +07:00
|
|
|
kunmap_atomic(userpage);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
set_extent_uptodate(tree, cur, cur + iosize - 1,
|
2011-04-06 17:02:20 +07:00
|
|
|
&cached, GFP_NOFS);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent_cached(tree, cur,
|
|
|
|
cur + iosize - 1,
|
|
|
|
&cached, GFP_NOFS);
|
2008-01-25 04:13:08 +07:00
|
|
|
cur = cur + iosize;
|
2011-04-19 19:29:38 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-25 04:13:08 +07:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
/* the get_extent function already copied into the page */
|
2009-09-03 02:22:30 +07:00
|
|
|
if (test_range_bit(tree, cur, cur_end,
|
|
|
|
EXTENT_UPTODATE, 1, NULL)) {
|
2008-09-06 03:09:51 +07:00
|
|
|
check_page_uptodate(tree, page);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent(tree, cur, cur + iosize - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
cur = cur + iosize;
|
2011-04-19 19:29:38 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-25 04:13:08 +07:00
|
|
|
continue;
|
|
|
|
}
|
2008-01-29 21:59:12 +07:00
|
|
|
/* we have an inline extent but it didn't get marked up
|
|
|
|
* to date. Error out
|
|
|
|
*/
|
|
|
|
if (block_start == EXTENT_MAP_INLINE) {
|
|
|
|
SetPageError(page);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent(tree, cur, cur + iosize - 1);
|
2008-01-29 21:59:12 +07:00
|
|
|
cur = cur + iosize;
|
2011-04-19 19:29:38 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-29 21:59:12 +07:00
|
|
|
continue;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2017-06-07 00:14:26 +07:00
|
|
|
ret = submit_extent_page(REQ_OP_READ | read_flags, tree, NULL,
|
2017-10-04 22:30:11 +07:00
|
|
|
page, offset, disk_io_size,
|
|
|
|
pg_offset, bdev, bio,
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
end_bio_extent_readpage, mirror_num,
|
|
|
|
*bio_flags,
|
Btrfs: fix read corruption of compressed and shared extents
If a file has a range pointing to a compressed extent, followed by
another range that points to the same compressed extent and a read
operation attempts to read both ranges (either completely or part of
them), the pages that correspond to the second range are incorrectly
filled with zeroes.
Consider the following example:
File layout
[0 - 8K] [8K - 24K]
| |
| |
points to extent X, points to extent X,
offset 4K, length of 8K offset 0, length 16K
[extent X, compressed length = 4K uncompressed length = 16K]
If a readpages() call spans the 2 ranges, a single bio to read the extent
is submitted - extent_io.c:submit_extent_page() would only create a new
bio to cover the second range pointing to the extent if the extent it
points to had a different logical address than the extent associated with
the first range. This has a consequence of the compressed read end io
handler (compression.c:end_compressed_bio_read()) finish once the extent
is decompressed into the pages covering the first range, leaving the
remaining pages (belonging to the second range) filled with zeroes (done
by compression.c:btrfs_clear_biovec_end()).
So fix this by submitting the current bio whenever we find a range
pointing to a compressed extent that was preceded by a range with a
different extent map. This is the simplest solution for this corner
case. Making the end io callback populate both ranges (or more, if we
have multiple pointing to the same extent) is a much more complex
solution since each bio is tightly coupled with a single extent map and
the extent maps associated to the ranges pointing to the shared extent
can have different offsets and lengths.
The following test case for fstests triggers the issue:
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_need_to_be_root
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner
rm -f $seqres.full
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
-c "pwrite -S 0xbb 4K 8K" \
-c "pwrite -S 0xcc 12K 4K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
$SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
-c "pwrite -S 0xbb 12K 8K" \
-c "pwrite -S 0xcc 20K 4K" \
$SCRATCH_MNT/bar | _filter_xfs_io
$CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File digests before unmounting filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
# Evicting the inode or clearing the page cache before reading
# again the file would also trigger the bug - reads were returning
# all bytes in the range corresponding to the second reference to
# the extent with a value of 0, but the correct data was persisted
# (it was a bug exclusively in the read path). The issue happened
# only if the same readpages() call targeted pages belonging to the
# first and second ranges that point to the same compressed extent.
_scratch_remount
echo "File digests after mounting filesystem again:"
# Must match the same digests we got before.
md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/bar | _filter_scratch
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo<quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
2015-09-14 15:09:31 +07:00
|
|
|
this_bio_flag,
|
|
|
|
force_bio_submit);
|
2013-02-11 23:33:00 +07:00
|
|
|
if (!ret) {
|
|
|
|
nr++;
|
|
|
|
*bio_flags = this_bio_flag;
|
|
|
|
} else {
|
2008-01-25 04:13:08 +07:00
|
|
|
SetPageError(page);
|
2016-01-28 02:17:20 +07:00
|
|
|
unlock_extent(tree, cur, cur + iosize - 1);
|
2016-07-12 00:39:07 +07:00
|
|
|
goto out;
|
2012-10-06 03:40:32 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
cur = cur + iosize;
|
2011-04-19 19:29:38 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2011-05-26 23:01:56 +07:00
|
|
|
out:
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!nr) {
|
|
|
|
if (!PageError(page))
|
|
|
|
SetPageUptodate(page);
|
|
|
|
unlock_page(page);
|
|
|
|
}
|
2016-07-12 00:39:07 +07:00
|
|
|
return ret;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2013-07-25 18:22:36 +07:00
|
|
|
static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
|
|
|
|
struct page *pages[], int nr_pages,
|
|
|
|
u64 start, u64 end,
|
|
|
|
get_extent_t *get_extent,
|
2013-07-25 18:22:37 +07:00
|
|
|
struct extent_map **em_cached,
|
2013-07-25 18:22:36 +07:00
|
|
|
struct bio **bio, int mirror_num,
|
2016-06-06 02:31:51 +07:00
|
|
|
unsigned long *bio_flags,
|
2015-09-28 15:56:26 +07:00
|
|
|
u64 *prev_em_start)
|
2013-07-25 18:22:36 +07:00
|
|
|
{
|
|
|
|
struct inode *inode;
|
|
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
int index;
|
|
|
|
|
|
|
|
inode = pages[0]->mapping->host;
|
|
|
|
while (1) {
|
|
|
|
lock_extent(tree, start, end);
|
2017-02-20 18:50:49 +07:00
|
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start,
|
2013-07-25 18:22:36 +07:00
|
|
|
end - start + 1);
|
|
|
|
if (!ordered)
|
|
|
|
break;
|
|
|
|
unlock_extent(tree, start, end);
|
|
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
|
|
btrfs_put_ordered_extent(ordered);
|
|
|
|
}
|
|
|
|
|
|
|
|
for (index = 0; index < nr_pages; index++) {
|
2013-07-25 18:22:37 +07:00
|
|
|
__do_readpage(tree, pages[index], get_extent, em_cached, bio,
|
2016-06-06 02:31:51 +07:00
|
|
|
mirror_num, bio_flags, 0, prev_em_start);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(pages[index]);
|
2013-07-25 18:22:36 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __extent_readpages(struct extent_io_tree *tree,
|
|
|
|
struct page *pages[],
|
|
|
|
int nr_pages, get_extent_t *get_extent,
|
2013-07-25 18:22:37 +07:00
|
|
|
struct extent_map **em_cached,
|
2013-07-25 18:22:36 +07:00
|
|
|
struct bio **bio, int mirror_num,
|
2016-06-06 02:31:51 +07:00
|
|
|
unsigned long *bio_flags,
|
2015-09-28 15:56:26 +07:00
|
|
|
u64 *prev_em_start)
|
2013-07-25 18:22:36 +07:00
|
|
|
{
|
2013-08-14 23:12:25 +07:00
|
|
|
u64 start = 0;
|
2013-07-25 18:22:36 +07:00
|
|
|
u64 end = 0;
|
|
|
|
u64 page_start;
|
|
|
|
int index;
|
2013-08-14 23:12:25 +07:00
|
|
|
int first_index = 0;
|
2013-07-25 18:22:36 +07:00
|
|
|
|
|
|
|
for (index = 0; index < nr_pages; index++) {
|
|
|
|
page_start = page_offset(pages[index]);
|
|
|
|
if (!end) {
|
|
|
|
start = page_start;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
end = start + PAGE_SIZE - 1;
|
2013-07-25 18:22:36 +07:00
|
|
|
first_index = index;
|
|
|
|
} else if (end + 1 == page_start) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
end += PAGE_SIZE;
|
2013-07-25 18:22:36 +07:00
|
|
|
} else {
|
|
|
|
__do_contiguous_readpages(tree, &pages[first_index],
|
|
|
|
index - first_index, start,
|
2013-07-25 18:22:37 +07:00
|
|
|
end, get_extent, em_cached,
|
|
|
|
bio, mirror_num, bio_flags,
|
2016-06-06 02:31:51 +07:00
|
|
|
prev_em_start);
|
2013-07-25 18:22:36 +07:00
|
|
|
start = page_start;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
end = start + PAGE_SIZE - 1;
|
2013-07-25 18:22:36 +07:00
|
|
|
first_index = index;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (end)
|
|
|
|
__do_contiguous_readpages(tree, &pages[first_index],
|
|
|
|
index - first_index, start,
|
2013-07-25 18:22:37 +07:00
|
|
|
end, get_extent, em_cached, bio,
|
2016-06-06 02:31:51 +07:00
|
|
|
mirror_num, bio_flags,
|
2015-09-28 15:56:26 +07:00
|
|
|
prev_em_start);
|
2013-07-25 18:22:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int __extent_read_full_page(struct extent_io_tree *tree,
|
|
|
|
struct page *page,
|
|
|
|
get_extent_t *get_extent,
|
|
|
|
struct bio **bio, int mirror_num,
|
2017-06-07 00:03:49 +07:00
|
|
|
unsigned long *bio_flags,
|
|
|
|
unsigned int read_flags)
|
2013-07-25 18:22:36 +07:00
|
|
|
{
|
|
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 end = start + PAGE_SIZE - 1;
|
2013-07-25 18:22:36 +07:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
lock_extent(tree, start, end);
|
2017-02-20 18:50:49 +07:00
|
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
PAGE_SIZE);
|
2013-07-25 18:22:36 +07:00
|
|
|
if (!ordered)
|
|
|
|
break;
|
|
|
|
unlock_extent(tree, start, end);
|
|
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
|
|
btrfs_put_ordered_extent(ordered);
|
|
|
|
}
|
|
|
|
|
2013-07-25 18:22:37 +07:00
|
|
|
ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num,
|
2016-06-06 02:31:51 +07:00
|
|
|
bio_flags, read_flags, NULL);
|
2013-07-25 18:22:36 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
|
2011-06-14 01:02:58 +07:00
|
|
|
get_extent_t *get_extent, int mirror_num)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct bio *bio = NULL;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
unsigned long bio_flags = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
int ret;
|
|
|
|
|
2011-06-14 01:02:58 +07:00
|
|
|
ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num,
|
2016-06-06 02:31:51 +07:00
|
|
|
&bio_flags, 0);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (bio)
|
2016-06-06 02:31:51 +07:00
|
|
|
ret = submit_one_bio(bio, mirror_num, bio_flags);
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2017-02-11 01:33:41 +07:00
|
|
|
static void update_nr_written(struct writeback_control *wbc,
|
2016-03-08 07:56:21 +07:00
|
|
|
unsigned long nr_written)
|
2009-04-21 02:50:09 +07:00
|
|
|
{
|
|
|
|
wbc->nr_to_write -= nr_written;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
2014-05-22 03:35:51 +07:00
|
|
|
* helper for __extent_writepage, doing all of the delayed allocation setup.
|
|
|
|
*
|
|
|
|
* This returns 1 if our fill_delalloc function did all the work required
|
|
|
|
* to write the page (copy into inline extent). In this case the IO has
|
|
|
|
* been started and the page is already unlocked.
|
|
|
|
*
|
|
|
|
* This returns 0 if all went well (page still locked)
|
|
|
|
* This returns < 0 if there were errors (page still locked)
|
2008-01-25 04:13:08 +07:00
|
|
|
*/
|
2014-05-22 03:35:51 +07:00
|
|
|
static noinline_for_stack int writepage_delalloc(struct inode *inode,
|
|
|
|
struct page *page, struct writeback_control *wbc,
|
|
|
|
struct extent_page_data *epd,
|
|
|
|
u64 delalloc_start,
|
|
|
|
unsigned long *nr_written)
|
|
|
|
{
|
|
|
|
struct extent_io_tree *tree = epd->tree;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 page_end = delalloc_start + PAGE_SIZE - 1;
|
2014-05-22 03:35:51 +07:00
|
|
|
u64 nr_delalloc;
|
|
|
|
u64 delalloc_to_write = 0;
|
|
|
|
u64 delalloc_end = 0;
|
|
|
|
int ret;
|
|
|
|
int page_started = 0;
|
|
|
|
|
|
|
|
if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
while (delalloc_end < page_end) {
|
|
|
|
nr_delalloc = find_lock_delalloc_range(inode, tree,
|
|
|
|
page,
|
|
|
|
&delalloc_start,
|
|
|
|
&delalloc_end,
|
2015-02-12 03:08:59 +07:00
|
|
|
BTRFS_MAX_EXTENT_SIZE);
|
2014-05-22 03:35:51 +07:00
|
|
|
if (nr_delalloc == 0) {
|
|
|
|
delalloc_start = delalloc_end + 1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
ret = tree->ops->fill_delalloc(inode, page,
|
|
|
|
delalloc_start,
|
|
|
|
delalloc_end,
|
|
|
|
&page_started,
|
|
|
|
nr_written);
|
|
|
|
/* File system has been set read-only */
|
|
|
|
if (ret) {
|
|
|
|
SetPageError(page);
|
|
|
|
/* fill_delalloc should be return < 0 for error
|
|
|
|
* but just in case, we use > 0 here meaning the
|
|
|
|
* IO is started, so we don't want to return > 0
|
|
|
|
* unless things are going well.
|
|
|
|
*/
|
|
|
|
ret = ret < 0 ? ret : -EIO;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
/*
|
2016-04-01 19:29:48 +07:00
|
|
|
* delalloc_end is already one less than the total length, so
|
|
|
|
* we don't subtract one from PAGE_SIZE
|
2014-05-22 03:35:51 +07:00
|
|
|
*/
|
|
|
|
delalloc_to_write += (delalloc_end - delalloc_start +
|
2016-04-01 19:29:48 +07:00
|
|
|
PAGE_SIZE) >> PAGE_SHIFT;
|
2014-05-22 03:35:51 +07:00
|
|
|
delalloc_start = delalloc_end + 1;
|
|
|
|
}
|
|
|
|
if (wbc->nr_to_write < delalloc_to_write) {
|
|
|
|
int thresh = 8192;
|
|
|
|
|
|
|
|
if (delalloc_to_write < thresh * 2)
|
|
|
|
thresh = delalloc_to_write;
|
|
|
|
wbc->nr_to_write = min_t(u64, delalloc_to_write,
|
|
|
|
thresh);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* did the fill delalloc function already unlock and start
|
|
|
|
* the IO?
|
|
|
|
*/
|
|
|
|
if (page_started) {
|
|
|
|
/*
|
|
|
|
* we've unlocked the page, so we can't update
|
|
|
|
* the mapping's writeback index, just update
|
|
|
|
* nr_to_write.
|
|
|
|
*/
|
|
|
|
wbc->nr_to_write -= *nr_written;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
done:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* helper for __extent_writepage. This calls the writepage start hooks,
|
|
|
|
* and does the loop to map the page into extents and bios.
|
|
|
|
*
|
|
|
|
* We return 1 if the IO is started and the page is unlocked,
|
|
|
|
* 0 if all went well (page still locked)
|
|
|
|
* < 0 if there were errors (page still locked)
|
|
|
|
*/
|
|
|
|
static noinline_for_stack int __extent_writepage_io(struct inode *inode,
|
|
|
|
struct page *page,
|
|
|
|
struct writeback_control *wbc,
|
|
|
|
struct extent_page_data *epd,
|
|
|
|
loff_t i_size,
|
|
|
|
unsigned long nr_written,
|
2017-06-07 00:03:49 +07:00
|
|
|
unsigned int write_flags, int *nr_ret)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_io_tree *tree = epd->tree;
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 page_end = start + PAGE_SIZE - 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
u64 end;
|
|
|
|
u64 cur = start;
|
|
|
|
u64 extent_offset;
|
|
|
|
u64 block_start;
|
|
|
|
u64 iosize;
|
|
|
|
struct extent_map *em;
|
|
|
|
struct block_device *bdev;
|
2008-07-18 23:01:11 +07:00
|
|
|
size_t pg_offset = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t blocksize;
|
2014-05-22 03:35:51 +07:00
|
|
|
int ret = 0;
|
|
|
|
int nr = 0;
|
|
|
|
bool compressed;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2008-07-17 23:53:51 +07:00
|
|
|
if (tree->ops && tree->ops->writepage_start_hook) {
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
ret = tree->ops->writepage_start_hook(page, start,
|
|
|
|
page_end);
|
2012-02-15 22:23:57 +07:00
|
|
|
if (ret) {
|
|
|
|
/* Fixup worker will requeue */
|
|
|
|
if (ret == -EBUSY)
|
|
|
|
wbc->pages_skipped++;
|
|
|
|
else
|
|
|
|
redirty_page_for_writepage(wbc, page);
|
2014-05-22 03:35:51 +07:00
|
|
|
|
2017-02-11 01:33:41 +07:00
|
|
|
update_nr_written(wbc, nr_written);
|
2008-07-17 23:53:51 +07:00
|
|
|
unlock_page(page);
|
2017-01-26 08:15:54 +07:00
|
|
|
return 1;
|
2008-07-17 23:53:51 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
/*
|
|
|
|
* we don't want to touch the inode after unlocking the page,
|
|
|
|
* so we update the mapping writeback index now
|
|
|
|
*/
|
2017-02-11 01:33:41 +07:00
|
|
|
update_nr_written(wbc, nr_written + 1);
|
2008-11-07 10:02:51 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
end = page_end;
|
2014-05-22 03:35:51 +07:00
|
|
|
if (i_size <= start) {
|
2008-07-17 23:53:50 +07:00
|
|
|
if (tree->ops && tree->ops->writepage_end_io_hook)
|
|
|
|
tree->ops->writepage_end_io_hook(page, start,
|
|
|
|
page_end, NULL, 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
blocksize = inode->i_sb->s_blocksize;
|
|
|
|
|
|
|
|
while (cur <= end) {
|
2014-05-22 03:35:51 +07:00
|
|
|
u64 em_end;
|
2017-10-04 22:30:11 +07:00
|
|
|
u64 offset;
|
2016-05-04 16:46:10 +07:00
|
|
|
|
2014-05-22 03:35:51 +07:00
|
|
|
if (cur >= i_size) {
|
2008-07-17 23:53:50 +07:00
|
|
|
if (tree->ops && tree->ops->writepage_end_io_hook)
|
|
|
|
tree->ops->writepage_end_io_hook(page, cur,
|
|
|
|
page_end, NULL, 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
}
|
2017-02-20 18:51:06 +07:00
|
|
|
em = epd->get_extent(BTRFS_I(inode), page, pg_offset, cur,
|
2008-01-25 04:13:08 +07:00
|
|
|
end - cur + 1, 1);
|
2011-04-19 23:00:01 +07:00
|
|
|
if (IS_ERR_OR_NULL(em)) {
|
2008-01-25 04:13:08 +07:00
|
|
|
SetPageError(page);
|
2014-05-09 23:17:40 +07:00
|
|
|
ret = PTR_ERR_OR_ZERO(em);
|
2008-01-25 04:13:08 +07:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
extent_offset = cur - em->start;
|
2014-05-22 03:35:51 +07:00
|
|
|
em_end = extent_map_end(em);
|
|
|
|
BUG_ON(em_end <= cur);
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(end < cur);
|
2014-05-22 03:35:51 +07:00
|
|
|
iosize = min(em_end - cur, end - cur + 1);
|
2013-02-26 15:10:22 +07:00
|
|
|
iosize = ALIGN(iosize, blocksize);
|
2017-10-04 22:30:11 +07:00
|
|
|
offset = em->block_start + extent_offset;
|
2008-01-25 04:13:08 +07:00
|
|
|
bdev = em->bdev;
|
|
|
|
block_start = em->block_start;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
2008-01-25 04:13:08 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
em = NULL;
|
|
|
|
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
/*
|
|
|
|
* compressed and inline extents are written through other
|
|
|
|
* paths in the FS
|
|
|
|
*/
|
|
|
|
if (compressed || block_start == EXTENT_MAP_HOLE ||
|
2008-01-25 04:13:08 +07:00
|
|
|
block_start == EXTENT_MAP_INLINE) {
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
/*
|
|
|
|
* end_io notification does not happen here for
|
|
|
|
* compressed extents
|
|
|
|
*/
|
|
|
|
if (!compressed && tree->ops &&
|
|
|
|
tree->ops->writepage_end_io_hook)
|
2008-07-17 23:53:50 +07:00
|
|
|
tree->ops->writepage_end_io_hook(page, cur,
|
|
|
|
cur + iosize - 1,
|
|
|
|
NULL, 1);
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
else if (compressed) {
|
|
|
|
/* we don't want to end_page_writeback on
|
|
|
|
* a compressed extent. this happens
|
|
|
|
* elsewhere
|
|
|
|
*/
|
|
|
|
nr++;
|
|
|
|
}
|
|
|
|
|
|
|
|
cur += iosize;
|
2008-07-18 23:01:11 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-25 04:13:08 +07:00
|
|
|
continue;
|
|
|
|
}
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
|
2016-05-04 16:46:10 +07:00
|
|
|
set_range_writeback(tree, cur, cur + iosize - 1);
|
|
|
|
if (!PageWriteback(page)) {
|
|
|
|
btrfs_err(BTRFS_I(inode)->root->fs_info,
|
|
|
|
"page %lu not writeback, cur %llu end %llu",
|
|
|
|
page->index, cur, end);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2008-07-18 23:01:11 +07:00
|
|
|
|
2017-06-07 00:14:26 +07:00
|
|
|
ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc,
|
2017-10-04 22:30:11 +07:00
|
|
|
page, offset, iosize, pg_offset,
|
2017-02-11 01:29:38 +07:00
|
|
|
bdev, &epd->bio,
|
2016-05-04 16:46:10 +07:00
|
|
|
end_bio_extent_writepage,
|
|
|
|
0, 0, 0, false);
|
Btrfs: add another missing end_page_writeback on submit_extent_page failure
If btrfs_bio_alloc fails in submit_extent_page, submit_extent_page returns
without clearing the writeback bit of the failed page.
__extent_writepage_io, that is a caller of submit_extent_page,
does not clear the remaining writeback bit anywhere.
As a result, this will cause the hang at filemap_fdatawait_range,
because it waits the writeback bit to be cleared from the failed page.
So, we have to call end_page_writeback to clear the writeback bit.
For reproducing the hang, we inject a fault like
if (should_failtest()) { // I define should_failtest()
bio = NULL;
}
else {
bio = btrfs_bio_alloc(...);
}
in submit_extent_page.
We should also check whether page has the bit before end_page_writeback,
to avoid the conflict against the other end_page_writeback in bio_endio.
Thus, we add PageWriteback checks not only in __extent_writepage_io,
but also in write_one_eb too, because it misses the check.
Signed-off-by: Takafumi Kubota <takafumi.kubota1012@sslab.ics.keio.ac.jp>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-02-09 15:24:33 +07:00
|
|
|
if (ret) {
|
2016-05-04 16:46:10 +07:00
|
|
|
SetPageError(page);
|
Btrfs: add another missing end_page_writeback on submit_extent_page failure
If btrfs_bio_alloc fails in submit_extent_page, submit_extent_page returns
without clearing the writeback bit of the failed page.
__extent_writepage_io, that is a caller of submit_extent_page,
does not clear the remaining writeback bit anywhere.
As a result, this will cause the hang at filemap_fdatawait_range,
because it waits the writeback bit to be cleared from the failed page.
So, we have to call end_page_writeback to clear the writeback bit.
For reproducing the hang, we inject a fault like
if (should_failtest()) { // I define should_failtest()
bio = NULL;
}
else {
bio = btrfs_bio_alloc(...);
}
in submit_extent_page.
We should also check whether page has the bit before end_page_writeback,
to avoid the conflict against the other end_page_writeback in bio_endio.
Thus, we add PageWriteback checks not only in __extent_writepage_io,
but also in write_one_eb too, because it misses the check.
Signed-off-by: Takafumi Kubota <takafumi.kubota1012@sslab.ics.keio.ac.jp>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-02-09 15:24:33 +07:00
|
|
|
if (PageWriteback(page))
|
|
|
|
end_page_writeback(page);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
cur = cur + iosize;
|
2008-07-18 23:01:11 +07:00
|
|
|
pg_offset += iosize;
|
2008-01-25 04:13:08 +07:00
|
|
|
nr++;
|
|
|
|
}
|
2014-05-22 03:35:51 +07:00
|
|
|
done:
|
|
|
|
*nr_ret = nr;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the writepage semantics are similar to regular writepage. extent
|
|
|
|
* records are inserted to lock ranges in the tree, and as dirty areas
|
|
|
|
* are found, they are marked writeback. Then the lock bits are removed
|
|
|
|
* and the end_io handler clears the writeback ranges
|
|
|
|
*/
|
|
|
|
static int __extent_writepage(struct page *page, struct writeback_control *wbc,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
struct extent_page_data *epd = data;
|
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 page_end = start + PAGE_SIZE - 1;
|
2014-05-22 03:35:51 +07:00
|
|
|
int ret;
|
|
|
|
int nr = 0;
|
|
|
|
size_t pg_offset = 0;
|
|
|
|
loff_t i_size = i_size_read(inode);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long end_index = i_size >> PAGE_SHIFT;
|
2017-06-07 00:03:49 +07:00
|
|
|
unsigned int write_flags = 0;
|
2014-05-22 03:35:51 +07:00
|
|
|
unsigned long nr_written = 0;
|
|
|
|
|
2017-08-25 07:19:48 +07:00
|
|
|
write_flags = wbc_to_write_flags(wbc);
|
2014-05-22 03:35:51 +07:00
|
|
|
|
|
|
|
trace___extent_writepage(page, inode, wbc);
|
|
|
|
|
|
|
|
WARN_ON(!PageLocked(page));
|
|
|
|
|
|
|
|
ClearPageError(page);
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
pg_offset = i_size & (PAGE_SIZE - 1);
|
2014-05-22 03:35:51 +07:00
|
|
|
if (page->index > end_index ||
|
|
|
|
(page->index == end_index && !pg_offset)) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
|
2014-05-22 03:35:51 +07:00
|
|
|
unlock_page(page);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (page->index == end_index) {
|
|
|
|
char *userpage;
|
|
|
|
|
|
|
|
userpage = kmap_atomic(page);
|
|
|
|
memset(userpage + pg_offset, 0,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
PAGE_SIZE - pg_offset);
|
2014-05-22 03:35:51 +07:00
|
|
|
kunmap_atomic(userpage);
|
|
|
|
flush_dcache_page(page);
|
|
|
|
}
|
|
|
|
|
|
|
|
pg_offset = 0;
|
|
|
|
|
|
|
|
set_page_extent_mapped(page);
|
|
|
|
|
|
|
|
ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written);
|
|
|
|
if (ret == 1)
|
|
|
|
goto done_unlocked;
|
|
|
|
if (ret)
|
|
|
|
goto done;
|
|
|
|
|
|
|
|
ret = __extent_writepage_io(inode, page, wbc, epd,
|
|
|
|
i_size, nr_written, write_flags, &nr);
|
|
|
|
if (ret == 1)
|
|
|
|
goto done_unlocked;
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
done:
|
|
|
|
if (nr == 0) {
|
|
|
|
/* make sure the mapping tag for page dirty gets cleared */
|
|
|
|
set_page_writeback(page);
|
|
|
|
end_page_writeback(page);
|
|
|
|
}
|
2014-05-09 23:17:40 +07:00
|
|
|
if (PageError(page)) {
|
|
|
|
ret = ret < 0 ? ret : -EIO;
|
|
|
|
end_extent_writepage(page, ret, start, page_end);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
unlock_page(page);
|
2014-05-22 03:35:51 +07:00
|
|
|
return ret;
|
2008-11-07 10:02:51 +07:00
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
done_unlocked:
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-04-25 03:41:19 +07:00
|
|
|
void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
|
2012-03-13 20:38:00 +07:00
|
|
|
{
|
sched: Remove proliferation of wait_on_bit() action functions
The current "wait_on_bit" interface requires an 'action'
function to be provided which does the actual waiting.
There are over 20 such functions, many of them identical.
Most cases can be satisfied by one of just two functions, one
which uses io_schedule() and one which just uses schedule().
So:
Rename wait_on_bit and wait_on_bit_lock to
wait_on_bit_action and wait_on_bit_lock_action
to make it explicit that they need an action function.
Introduce new wait_on_bit{,_lock} and wait_on_bit{,_lock}_io
which are *not* given an action function but implicitly use
a standard one.
The decision to error-out if a signal is pending is now made
based on the 'mode' argument rather than being encoded in the action
function.
All instances of the old wait_on_bit and wait_on_bit_lock which
can use the new version have been changed accordingly and their
action functions have been discarded.
wait_on_bit{_lock} does not return any specific error code in the
event of a signal so the caller must check for non-zero and
interpolate their own error code as appropriate.
The wait_on_bit() call in __fscache_wait_on_invalidate() was
ambiguous as it specified TASK_UNINTERRUPTIBLE but used
fscache_wait_bit_interruptible as an action function.
David Howells confirms this should be uniformly
"uninterruptible"
The main remaining user of wait_on_bit{,_lock}_action is NFS
which needs to use a freezer-aware schedule() call.
A comment in fs/gfs2/glock.c notes that having multiple 'action'
functions is useful as they display differently in the 'wchan'
field of 'ps'. (and /proc/$PID/wchan).
As the new bit_wait{,_io} functions are tagged "__sched", they
will not show up at all, but something higher in the stack. So
the distinction will still be visible, only with different
function names (gds2_glock_wait versus gfs2_glock_dq_wait in the
gfs2/glock.c case).
Since first version of this patch (against 3.15) two new action
functions appeared, on in NFS and one in CIFS. CIFS also now
uses an action function that makes the same freezer aware
schedule call as NFS.
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: David Howells <dhowells@redhat.com> (fscache, keys)
Acked-by: Steven Whitehouse <swhiteho@redhat.com> (gfs2)
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steve French <sfrench@samba.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140707051603.28027.72349.stgit@notabene.brown
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-07-07 12:16:04 +07:00
|
|
|
wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK,
|
|
|
|
TASK_UNINTERRUPTIBLE);
|
2012-03-13 20:38:00 +07:00
|
|
|
}
|
|
|
|
|
2014-05-20 10:55:27 +07:00
|
|
|
static noinline_for_stack int
|
|
|
|
lock_extent_buffer_for_io(struct extent_buffer *eb,
|
|
|
|
struct btrfs_fs_info *fs_info,
|
|
|
|
struct extent_page_data *epd)
|
2012-03-13 20:38:00 +07:00
|
|
|
{
|
|
|
|
unsigned long i, num_pages;
|
|
|
|
int flush = 0;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!btrfs_try_tree_write_lock(eb)) {
|
|
|
|
flush = 1;
|
|
|
|
flush_write_bio(epd);
|
|
|
|
btrfs_tree_lock(eb);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) {
|
|
|
|
btrfs_tree_unlock(eb);
|
|
|
|
if (!epd->sync_io)
|
|
|
|
return 0;
|
|
|
|
if (!flush) {
|
|
|
|
flush_write_bio(epd);
|
|
|
|
flush = 1;
|
|
|
|
}
|
2012-03-21 23:09:56 +07:00
|
|
|
while (1) {
|
|
|
|
wait_on_extent_buffer_writeback(eb);
|
|
|
|
btrfs_tree_lock(eb);
|
|
|
|
if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags))
|
|
|
|
break;
|
2012-03-13 20:38:00 +07:00
|
|
|
btrfs_tree_unlock(eb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-07-21 03:25:24 +07:00
|
|
|
/*
|
|
|
|
* We need to do this to prevent races in people who check if the eb is
|
|
|
|
* under IO since we can end up having no IO bits set for a short period
|
|
|
|
* of time.
|
|
|
|
*/
|
|
|
|
spin_lock(&eb->refs_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
|
|
|
|
set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
|
2012-07-21 03:25:24 +07:00
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
|
2017-06-21 01:01:20 +07:00
|
|
|
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
|
|
|
|
-eb->len,
|
|
|
|
fs_info->dirty_metadata_batch);
|
2012-03-13 20:38:00 +07:00
|
|
|
ret = 1;
|
2012-07-21 03:25:24 +07:00
|
|
|
} else {
|
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
btrfs_tree_unlock(eb);
|
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
struct page *p = eb->pages[i];
|
2012-03-13 20:38:00 +07:00
|
|
|
|
|
|
|
if (!trylock_page(p)) {
|
|
|
|
if (!flush) {
|
|
|
|
flush_write_bio(epd);
|
|
|
|
flush = 1;
|
|
|
|
}
|
|
|
|
lock_page(p);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void end_extent_buffer_writeback(struct extent_buffer *eb)
|
|
|
|
{
|
|
|
|
clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
|
2014-03-18 00:06:10 +07:00
|
|
|
smp_mb__after_atomic();
|
2012-03-13 20:38:00 +07:00
|
|
|
wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK);
|
|
|
|
}
|
|
|
|
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
static void set_btree_ioerr(struct page *page)
|
|
|
|
{
|
|
|
|
struct extent_buffer *eb = (struct extent_buffer *)page->private;
|
|
|
|
|
|
|
|
SetPageError(page);
|
|
|
|
if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags))
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If writeback for a btree extent that doesn't belong to a log tree
|
|
|
|
* failed, increment the counter transaction->eb_write_errors.
|
|
|
|
* We do this because while the transaction is running and before it's
|
|
|
|
* committing (when we call filemap_fdata[write|wait]_range against
|
|
|
|
* the btree inode), we might have
|
|
|
|
* btree_inode->i_mapping->a_ops->writepages() called by the VM - if it
|
|
|
|
* returns an error or an error happens during writeback, when we're
|
|
|
|
* committing the transaction we wouldn't know about it, since the pages
|
|
|
|
* can be no longer dirty nor marked anymore for writeback (if a
|
|
|
|
* subsequent modification to the extent buffer didn't happen before the
|
|
|
|
* transaction commit), which makes filemap_fdata[write|wait]_range not
|
|
|
|
* able to find the pages tagged with SetPageError at transaction
|
|
|
|
* commit time. So if this happens we must abort the transaction,
|
|
|
|
* otherwise we commit a super block with btree roots that point to
|
|
|
|
* btree nodes/leafs whose content on disk is invalid - either garbage
|
|
|
|
* or the content of some node/leaf from a past generation that got
|
|
|
|
* cowed or deleted and is no longer valid.
|
|
|
|
*
|
|
|
|
* Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would
|
|
|
|
* not be enough - we need to distinguish between log tree extents vs
|
|
|
|
* non-log tree extents, and the next filemap_fdatawait_range() call
|
|
|
|
* will catch and clear such errors in the mapping - and that call might
|
|
|
|
* be from a log sync and not from a transaction commit. Also, checking
|
|
|
|
* for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is
|
|
|
|
* not done and would not be reliable - the eb might have been released
|
|
|
|
* from memory and reading it back again means that flag would not be
|
|
|
|
* set (since it's a runtime flag, not persisted on disk).
|
|
|
|
*
|
|
|
|
* Using the flags below in the btree inode also makes us achieve the
|
|
|
|
* goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
|
|
|
|
* writeback for all dirty pages and before filemap_fdatawait_range()
|
|
|
|
* is called, the writeback for all dirty pages had already finished
|
|
|
|
* with errors - because we were not using AS_EIO/AS_ENOSPC,
|
|
|
|
* filemap_fdatawait_range() would return success, as it could not know
|
|
|
|
* that writeback errors happened (the pages were no longer tagged for
|
|
|
|
* writeback).
|
|
|
|
*/
|
|
|
|
switch (eb->log_index) {
|
|
|
|
case -1:
|
2016-09-03 02:40:02 +07:00
|
|
|
set_bit(BTRFS_FS_BTREE_ERR, &eb->fs_info->flags);
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
break;
|
|
|
|
case 0:
|
2016-09-03 02:40:02 +07:00
|
|
|
set_bit(BTRFS_FS_LOG1_ERR, &eb->fs_info->flags);
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
break;
|
|
|
|
case 1:
|
2016-09-03 02:40:02 +07:00
|
|
|
set_bit(BTRFS_FS_LOG2_ERR, &eb->fs_info->flags);
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
BUG(); /* unexpected, logic error */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-07-20 20:29:37 +07:00
|
|
|
static void end_bio_extent_buffer_writepage(struct bio *bio)
|
2012-03-13 20:38:00 +07:00
|
|
|
{
|
2013-11-08 03:20:26 +07:00
|
|
|
struct bio_vec *bvec;
|
2012-03-13 20:38:00 +07:00
|
|
|
struct extent_buffer *eb;
|
2013-11-08 03:20:26 +07:00
|
|
|
int i, done;
|
2012-03-13 20:38:00 +07:00
|
|
|
|
2017-07-13 23:10:07 +07:00
|
|
|
ASSERT(!bio_flagged(bio, BIO_CLONED));
|
2013-11-08 03:20:26 +07:00
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
2012-03-13 20:38:00 +07:00
|
|
|
struct page *page = bvec->bv_page;
|
|
|
|
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
|
|
BUG_ON(!eb);
|
|
|
|
done = atomic_dec_and_test(&eb->io_pages);
|
|
|
|
|
2017-06-03 14:38:06 +07:00
|
|
|
if (bio->bi_status ||
|
2015-07-20 20:29:37 +07:00
|
|
|
test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) {
|
2012-03-13 20:38:00 +07:00
|
|
|
ClearPageUptodate(page);
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
set_btree_ioerr(page);
|
2012-03-13 20:38:00 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
end_page_writeback(page);
|
|
|
|
|
|
|
|
if (!done)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
end_extent_buffer_writeback(eb);
|
2013-11-08 03:20:26 +07:00
|
|
|
}
|
2012-03-13 20:38:00 +07:00
|
|
|
|
|
|
|
bio_put(bio);
|
|
|
|
}
|
|
|
|
|
2014-05-20 10:55:27 +07:00
|
|
|
static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
|
2012-03-13 20:38:00 +07:00
|
|
|
struct btrfs_fs_info *fs_info,
|
|
|
|
struct writeback_control *wbc,
|
|
|
|
struct extent_page_data *epd)
|
|
|
|
{
|
|
|
|
struct block_device *bdev = fs_info->fs_devices->latest_bdev;
|
2013-12-17 01:24:27 +07:00
|
|
|
struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
|
2012-03-13 20:38:00 +07:00
|
|
|
u64 offset = eb->start;
|
2016-09-24 03:44:44 +07:00
|
|
|
u32 nritems;
|
2012-03-13 20:38:00 +07:00
|
|
|
unsigned long i, num_pages;
|
2016-09-24 03:44:44 +07:00
|
|
|
unsigned long start, end;
|
2017-08-25 07:19:48 +07:00
|
|
|
unsigned int write_flags = wbc_to_write_flags(wbc) | REQ_META;
|
2012-04-24 01:00:51 +07:00
|
|
|
int ret = 0;
|
2012-03-13 20:38:00 +07:00
|
|
|
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags);
|
2012-03-13 20:38:00 +07:00
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
|
|
|
atomic_set(&eb->io_pages, num_pages);
|
2012-09-26 01:25:58 +07:00
|
|
|
|
2016-09-24 03:44:44 +07:00
|
|
|
/* set btree blocks beyond nritems with 0 to avoid stale content. */
|
|
|
|
nritems = btrfs_header_nritems(eb);
|
2016-09-15 07:22:57 +07:00
|
|
|
if (btrfs_header_level(eb) > 0) {
|
|
|
|
end = btrfs_node_key_ptr_offset(nritems);
|
|
|
|
|
2016-11-09 00:09:03 +07:00
|
|
|
memzero_extent_buffer(eb, end, eb->len - end);
|
2016-09-24 03:44:44 +07:00
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* leaf:
|
|
|
|
* header 0 1 2 .. N ... data_N .. data_2 data_1 data_0
|
|
|
|
*/
|
|
|
|
start = btrfs_item_nr_offset(nritems);
|
2017-05-29 13:43:43 +07:00
|
|
|
end = BTRFS_LEAF_DATA_OFFSET + leaf_data_end(fs_info, eb);
|
2016-11-09 00:09:03 +07:00
|
|
|
memzero_extent_buffer(eb, start, end - start);
|
2016-09-15 07:22:57 +07:00
|
|
|
}
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
struct page *p = eb->pages[i];
|
2012-03-13 20:38:00 +07:00
|
|
|
|
|
|
|
clear_page_dirty_for_io(p);
|
|
|
|
set_page_writeback(p);
|
2017-06-07 00:14:26 +07:00
|
|
|
ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc,
|
2017-10-04 22:30:11 +07:00
|
|
|
p, offset, PAGE_SIZE, 0, bdev,
|
2017-02-11 01:29:38 +07:00
|
|
|
&epd->bio,
|
2016-06-06 02:31:51 +07:00
|
|
|
end_bio_extent_buffer_writepage,
|
Btrfs: remove bio_flags which indicates a meta block of log-tree
Since both committing transaction and writing log-tree are doing
plugging on metadata IO, we can unify to use %sync_writers to benefit
both cases, instead of checking bio_flags while writing meta blocks of
log-tree.
We can remove this bio_flags because in order to write dirty blocks,
log tree also uses btrfs_write_marked_extents(), inside which we
have enabled %sync_writers, therefore, every write goes in a
synchronous way, so does checksuming.
Please also note that, bio_flags is applied per-context while
%sync_writers is applied per-inode, so this might incur some overhead, ie.
1) while log tree is flushing its dirty blocks via
btrfs_write_marked_extents(), in which %sync_writers is increased
by one.
2) in the meantime, some writeback operations may happen upon btrfs's
metadata inode, so these writes go synchronously, too.
However, AFAICS, the overhead is not a big one while the win is that
we unify the two places that needs synchronous way and remove a
special hack/flag.
This removes the bio_flags related stuff for writing log-tree.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-09-14 01:18:22 +07:00
|
|
|
0, 0, 0, false);
|
2012-03-13 20:38:00 +07:00
|
|
|
if (ret) {
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
set_btree_ioerr(p);
|
Btrfs: add another missing end_page_writeback on submit_extent_page failure
If btrfs_bio_alloc fails in submit_extent_page, submit_extent_page returns
without clearing the writeback bit of the failed page.
__extent_writepage_io, that is a caller of submit_extent_page,
does not clear the remaining writeback bit anywhere.
As a result, this will cause the hang at filemap_fdatawait_range,
because it waits the writeback bit to be cleared from the failed page.
So, we have to call end_page_writeback to clear the writeback bit.
For reproducing the hang, we inject a fault like
if (should_failtest()) { // I define should_failtest()
bio = NULL;
}
else {
bio = btrfs_bio_alloc(...);
}
in submit_extent_page.
We should also check whether page has the bit before end_page_writeback,
to avoid the conflict against the other end_page_writeback in bio_endio.
Thus, we add PageWriteback checks not only in __extent_writepage_io,
but also in write_one_eb too, because it misses the check.
Signed-off-by: Takafumi Kubota <takafumi.kubota1012@sslab.ics.keio.ac.jp>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-02-09 15:24:33 +07:00
|
|
|
if (PageWriteback(p))
|
|
|
|
end_page_writeback(p);
|
2012-03-13 20:38:00 +07:00
|
|
|
if (atomic_sub_and_test(num_pages - i, &eb->io_pages))
|
|
|
|
end_extent_buffer_writeback(eb);
|
|
|
|
ret = -EIO;
|
|
|
|
break;
|
|
|
|
}
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset += PAGE_SIZE;
|
2017-02-11 01:33:41 +07:00
|
|
|
update_nr_written(wbc, 1);
|
2012-03-13 20:38:00 +07:00
|
|
|
unlock_page(p);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (unlikely(ret)) {
|
|
|
|
for (; i < num_pages; i++) {
|
2014-10-04 23:56:45 +07:00
|
|
|
struct page *p = eb->pages[i];
|
2014-09-23 21:22:33 +07:00
|
|
|
clear_page_dirty_for_io(p);
|
2012-03-13 20:38:00 +07:00
|
|
|
unlock_page(p);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btree_write_cache_pages(struct address_space *mapping,
|
|
|
|
struct writeback_control *wbc)
|
|
|
|
{
|
|
|
|
struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
|
|
|
|
struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info;
|
|
|
|
struct extent_buffer *eb, *prev_eb = NULL;
|
|
|
|
struct extent_page_data epd = {
|
|
|
|
.bio = NULL,
|
|
|
|
.tree = tree,
|
|
|
|
.extent_locked = 0,
|
|
|
|
.sync_io = wbc->sync_mode == WB_SYNC_ALL,
|
|
|
|
};
|
|
|
|
int ret = 0;
|
|
|
|
int done = 0;
|
|
|
|
int nr_to_write_done = 0;
|
|
|
|
struct pagevec pvec;
|
|
|
|
int nr_pages;
|
|
|
|
pgoff_t index;
|
|
|
|
pgoff_t end; /* Inclusive */
|
|
|
|
int scanned = 0;
|
|
|
|
int tag;
|
|
|
|
|
2017-11-16 08:37:52 +07:00
|
|
|
pagevec_init(&pvec);
|
2012-03-13 20:38:00 +07:00
|
|
|
if (wbc->range_cyclic) {
|
|
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
|
|
|
end = -1;
|
|
|
|
} else {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
index = wbc->range_start >> PAGE_SHIFT;
|
|
|
|
end = wbc->range_end >> PAGE_SHIFT;
|
2012-03-13 20:38:00 +07:00
|
|
|
scanned = 1;
|
|
|
|
}
|
|
|
|
if (wbc->sync_mode == WB_SYNC_ALL)
|
|
|
|
tag = PAGECACHE_TAG_TOWRITE;
|
|
|
|
else
|
|
|
|
tag = PAGECACHE_TAG_DIRTY;
|
|
|
|
retry:
|
|
|
|
if (wbc->sync_mode == WB_SYNC_ALL)
|
|
|
|
tag_pages_for_writeback(mapping, index, end);
|
|
|
|
while (!done && !nr_to_write_done && (index <= end) &&
|
2017-11-16 08:34:37 +07:00
|
|
|
(nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
|
2017-11-16 08:35:19 +07:00
|
|
|
tag))) {
|
2012-03-13 20:38:00 +07:00
|
|
|
unsigned i;
|
|
|
|
|
|
|
|
scanned = 1;
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
|
|
struct page *page = pvec.pages[i];
|
|
|
|
|
|
|
|
if (!PagePrivate(page))
|
|
|
|
continue;
|
|
|
|
|
2012-09-15 00:43:01 +07:00
|
|
|
spin_lock(&mapping->private_lock);
|
|
|
|
if (!PagePrivate(page)) {
|
|
|
|
spin_unlock(&mapping->private_lock);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
eb = (struct extent_buffer *)page->private;
|
2012-09-15 00:43:01 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Shouldn't happen and normally this would be a BUG_ON
|
|
|
|
* but no sense in crashing the users box for something
|
|
|
|
* we can survive anyway.
|
|
|
|
*/
|
2013-10-31 12:00:08 +07:00
|
|
|
if (WARN_ON(!eb)) {
|
2012-09-15 00:43:01 +07:00
|
|
|
spin_unlock(&mapping->private_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2012-09-15 00:43:01 +07:00
|
|
|
if (eb == prev_eb) {
|
|
|
|
spin_unlock(&mapping->private_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
continue;
|
2012-09-15 00:43:01 +07:00
|
|
|
}
|
2012-03-13 20:38:00 +07:00
|
|
|
|
2012-09-15 00:43:01 +07:00
|
|
|
ret = atomic_inc_not_zero(&eb->refs);
|
|
|
|
spin_unlock(&mapping->private_lock);
|
|
|
|
if (!ret)
|
2012-03-13 20:38:00 +07:00
|
|
|
continue;
|
|
|
|
|
|
|
|
prev_eb = eb;
|
|
|
|
ret = lock_extent_buffer_for_io(eb, fs_info, &epd);
|
|
|
|
if (!ret) {
|
|
|
|
free_extent_buffer(eb);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = write_one_eb(eb, fs_info, wbc, &epd);
|
|
|
|
if (ret) {
|
|
|
|
done = 1;
|
|
|
|
free_extent_buffer(eb);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
free_extent_buffer(eb);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the filesystem may choose to bump up nr_to_write.
|
|
|
|
* We have to make sure to honor the new nr_to_write
|
|
|
|
* at any time
|
|
|
|
*/
|
|
|
|
nr_to_write_done = wbc->nr_to_write <= 0;
|
|
|
|
}
|
|
|
|
pagevec_release(&pvec);
|
|
|
|
cond_resched();
|
|
|
|
}
|
|
|
|
if (!scanned && !done) {
|
|
|
|
/*
|
|
|
|
* We hit the last page and there is more work to be done: wrap
|
|
|
|
* back to the start of the file
|
|
|
|
*/
|
|
|
|
scanned = 1;
|
|
|
|
index = 0;
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
flush_write_bio(&epd);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/**
|
2008-09-08 22:18:08 +07:00
|
|
|
* write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
|
2008-01-25 04:13:08 +07:00
|
|
|
* @mapping: address space structure to write
|
|
|
|
* @wbc: subtract the number of written pages from *@wbc->nr_to_write
|
|
|
|
* @writepage: function called for each page
|
|
|
|
* @data: data passed to writepage function
|
|
|
|
*
|
|
|
|
* If a page is already under I/O, write_cache_pages() skips it, even
|
|
|
|
* if it's dirty. This is desirable behaviour for memory-cleaning writeback,
|
|
|
|
* but it is INCORRECT for data-integrity system calls such as fsync(). fsync()
|
|
|
|
* and msync() need to guarantee that all the data which was dirty at the time
|
|
|
|
* the call was made get new I/O started against them. If wbc->sync_mode is
|
|
|
|
* WB_SYNC_ALL then we were called for data integrity and we must wait for
|
|
|
|
* existing IO to complete.
|
|
|
|
*/
|
2017-02-11 01:38:24 +07:00
|
|
|
static int extent_write_cache_pages(struct address_space *mapping,
|
2008-09-08 22:18:08 +07:00
|
|
|
struct writeback_control *wbc,
|
2008-11-20 00:44:22 +07:00
|
|
|
writepage_t writepage, void *data,
|
|
|
|
void (*flush_fn)(void *))
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2012-06-28 04:18:41 +07:00
|
|
|
struct inode *inode = mapping->host;
|
2008-01-25 04:13:08 +07:00
|
|
|
int ret = 0;
|
|
|
|
int done = 0;
|
2009-09-19 03:03:16 +07:00
|
|
|
int nr_to_write_done = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct pagevec pvec;
|
|
|
|
int nr_pages;
|
|
|
|
pgoff_t index;
|
|
|
|
pgoff_t end; /* Inclusive */
|
2016-03-08 07:56:21 +07:00
|
|
|
pgoff_t done_index;
|
|
|
|
int range_whole = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
int scanned = 0;
|
2011-07-16 04:26:38 +07:00
|
|
|
int tag;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2012-06-28 04:18:41 +07:00
|
|
|
/*
|
|
|
|
* We have to hold onto the inode so that ordered extents can do their
|
|
|
|
* work when the IO finishes. The alternative to this is failing to add
|
|
|
|
* an ordered extent if the igrab() fails there and that is a huge pain
|
|
|
|
* to deal with, so instead just hold onto the inode throughout the
|
|
|
|
* writepages operation. If it fails here we are freeing up the inode
|
|
|
|
* anyway and we'd rather not waste our time writing out stuff that is
|
|
|
|
* going to be truncated anyway.
|
|
|
|
*/
|
|
|
|
if (!igrab(inode))
|
|
|
|
return 0;
|
|
|
|
|
2017-11-16 08:37:52 +07:00
|
|
|
pagevec_init(&pvec);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (wbc->range_cyclic) {
|
|
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
|
|
|
end = -1;
|
|
|
|
} else {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
index = wbc->range_start >> PAGE_SHIFT;
|
|
|
|
end = wbc->range_end >> PAGE_SHIFT;
|
2016-03-08 07:56:21 +07:00
|
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
|
|
|
range_whole = 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
scanned = 1;
|
|
|
|
}
|
2011-07-16 04:26:38 +07:00
|
|
|
if (wbc->sync_mode == WB_SYNC_ALL)
|
|
|
|
tag = PAGECACHE_TAG_TOWRITE;
|
|
|
|
else
|
|
|
|
tag = PAGECACHE_TAG_DIRTY;
|
2008-01-25 04:13:08 +07:00
|
|
|
retry:
|
2011-07-16 04:26:38 +07:00
|
|
|
if (wbc->sync_mode == WB_SYNC_ALL)
|
|
|
|
tag_pages_for_writeback(mapping, index, end);
|
2016-03-08 07:56:21 +07:00
|
|
|
done_index = index;
|
2009-09-19 03:03:16 +07:00
|
|
|
while (!done && !nr_to_write_done && (index <= end) &&
|
2017-11-16 08:35:19 +07:00
|
|
|
(nr_pages = pagevec_lookup_range_tag(&pvec, mapping,
|
|
|
|
&index, end, tag))) {
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned i;
|
|
|
|
|
|
|
|
scanned = 1;
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
|
|
struct page *page = pvec.pages[i];
|
|
|
|
|
2016-03-08 07:56:21 +07:00
|
|
|
done_index = page->index;
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* At this point we hold neither mapping->tree_lock nor
|
|
|
|
* lock on the page itself: the page may be truncated or
|
|
|
|
* invalidated (changing page->mapping to NULL), or even
|
|
|
|
* swizzled back from swapper_space to tmpfs file
|
|
|
|
* mapping
|
|
|
|
*/
|
2013-02-11 23:33:00 +07:00
|
|
|
if (!trylock_page(page)) {
|
|
|
|
flush_fn(data);
|
|
|
|
lock_page(page);
|
2011-11-01 21:08:06 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
if (unlikely(page->mapping != mapping)) {
|
|
|
|
unlock_page(page);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2008-11-20 00:44:22 +07:00
|
|
|
if (wbc->sync_mode != WB_SYNC_NONE) {
|
2008-11-20 22:46:35 +07:00
|
|
|
if (PageWriteback(page))
|
|
|
|
flush_fn(data);
|
2008-01-25 04:13:08 +07:00
|
|
|
wait_on_page_writeback(page);
|
2008-11-20 00:44:22 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
if (PageWriteback(page) ||
|
|
|
|
!clear_page_dirty_for_io(page)) {
|
|
|
|
unlock_page(page);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = (*writepage)(page, wbc, data);
|
|
|
|
|
|
|
|
if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) {
|
|
|
|
unlock_page(page);
|
|
|
|
ret = 0;
|
|
|
|
}
|
2016-03-08 07:56:21 +07:00
|
|
|
if (ret < 0) {
|
|
|
|
/*
|
|
|
|
* done_index is set past this page,
|
|
|
|
* so media errors will not choke
|
|
|
|
* background writeout for the entire
|
|
|
|
* file. This has consequences for
|
|
|
|
* range_cyclic semantics (ie. it may
|
|
|
|
* not be suitable for data integrity
|
|
|
|
* writeout).
|
|
|
|
*/
|
|
|
|
done_index = page->index + 1;
|
|
|
|
done = 1;
|
|
|
|
break;
|
|
|
|
}
|
2009-09-19 03:03:16 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* the filesystem may choose to bump up nr_to_write.
|
|
|
|
* We have to make sure to honor the new nr_to_write
|
|
|
|
* at any time
|
|
|
|
*/
|
|
|
|
nr_to_write_done = wbc->nr_to_write <= 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
pagevec_release(&pvec);
|
|
|
|
cond_resched();
|
|
|
|
}
|
2016-03-08 07:56:22 +07:00
|
|
|
if (!scanned && !done) {
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* We hit the last page and there is more work to be done: wrap
|
|
|
|
* back to the start of the file
|
|
|
|
*/
|
|
|
|
scanned = 1;
|
|
|
|
index = 0;
|
|
|
|
goto retry;
|
|
|
|
}
|
2016-03-08 07:56:21 +07:00
|
|
|
|
|
|
|
if (wbc->range_cyclic || (wbc->nr_to_write > 0 && range_whole))
|
|
|
|
mapping->writeback_index = done_index;
|
|
|
|
|
2012-06-28 04:18:41 +07:00
|
|
|
btrfs_add_delayed_iput(inode);
|
2016-03-08 07:56:22 +07:00
|
|
|
return ret;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
static void flush_epd_write_bio(struct extent_page_data *epd)
|
2008-11-20 00:44:22 +07:00
|
|
|
{
|
|
|
|
if (epd->bio) {
|
2011-10-04 10:23:14 +07:00
|
|
|
int ret;
|
|
|
|
|
Btrfs: remove bio_flags which indicates a meta block of log-tree
Since both committing transaction and writing log-tree are doing
plugging on metadata IO, we can unify to use %sync_writers to benefit
both cases, instead of checking bio_flags while writing meta blocks of
log-tree.
We can remove this bio_flags because in order to write dirty blocks,
log tree also uses btrfs_write_marked_extents(), inside which we
have enabled %sync_writers, therefore, every write goes in a
synchronous way, so does checksuming.
Please also note that, bio_flags is applied per-context while
%sync_writers is applied per-inode, so this might incur some overhead, ie.
1) while log tree is flushing its dirty blocks via
btrfs_write_marked_extents(), in which %sync_writers is increased
by one.
2) in the meantime, some writeback operations may happen upon btrfs's
metadata inode, so these writes go synchronously, too.
However, AFAICS, the overhead is not a big one while the win is that
we unify the two places that needs synchronous way and remove a
special hack/flag.
This removes the bio_flags related stuff for writing log-tree.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-09-14 01:18:22 +07:00
|
|
|
ret = submit_one_bio(epd->bio, 0, 0);
|
2012-03-12 22:03:00 +07:00
|
|
|
BUG_ON(ret < 0); /* -ENOMEM */
|
2008-11-20 00:44:22 +07:00
|
|
|
epd->bio = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
static noinline void flush_write_bio(void *data)
|
|
|
|
{
|
|
|
|
struct extent_page_data *epd = data;
|
|
|
|
flush_epd_write_bio(epd);
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
|
|
|
|
get_extent_t *get_extent,
|
|
|
|
struct writeback_control *wbc)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct extent_page_data epd = {
|
|
|
|
.bio = NULL,
|
|
|
|
.tree = tree,
|
|
|
|
.get_extent = get_extent,
|
2008-11-07 10:02:51 +07:00
|
|
|
.extent_locked = 0,
|
2009-04-21 02:50:09 +07:00
|
|
|
.sync_io = wbc->sync_mode == WB_SYNC_ALL,
|
2008-01-25 04:13:08 +07:00
|
|
|
};
|
|
|
|
|
|
|
|
ret = __extent_writepage(page, wbc, &epd);
|
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
flush_epd_write_bio(&epd);
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-11-07 10:02:51 +07:00
|
|
|
int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
|
|
|
|
u64 start, u64 end, get_extent_t *get_extent,
|
|
|
|
int mode)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
struct address_space *mapping = inode->i_mapping;
|
|
|
|
struct page *page;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long nr_pages = (end - start + PAGE_SIZE) >>
|
|
|
|
PAGE_SHIFT;
|
2008-11-07 10:02:51 +07:00
|
|
|
|
|
|
|
struct extent_page_data epd = {
|
|
|
|
.bio = NULL,
|
|
|
|
.tree = tree,
|
|
|
|
.get_extent = get_extent,
|
|
|
|
.extent_locked = 1,
|
2009-04-21 02:50:09 +07:00
|
|
|
.sync_io = mode == WB_SYNC_ALL,
|
2008-11-07 10:02:51 +07:00
|
|
|
};
|
|
|
|
struct writeback_control wbc_writepages = {
|
|
|
|
.sync_mode = mode,
|
|
|
|
.nr_to_write = nr_pages * 2,
|
|
|
|
.range_start = start,
|
|
|
|
.range_end = end + 1,
|
|
|
|
};
|
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (start <= end) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
page = find_get_page(mapping, start >> PAGE_SHIFT);
|
2008-11-07 10:02:51 +07:00
|
|
|
if (clear_page_dirty_for_io(page))
|
|
|
|
ret = __extent_writepage(page, &wbc_writepages, &epd);
|
|
|
|
else {
|
|
|
|
if (tree->ops && tree->ops->writepage_end_io_hook)
|
|
|
|
tree->ops->writepage_end_io_hook(page, start,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
start + PAGE_SIZE - 1,
|
2008-11-07 10:02:51 +07:00
|
|
|
NULL, 1);
|
|
|
|
unlock_page(page);
|
|
|
|
}
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
|
|
|
start += PAGE_SIZE;
|
2008-11-07 10:02:51 +07:00
|
|
|
}
|
|
|
|
|
2009-04-21 02:50:09 +07:00
|
|
|
flush_epd_write_bio(&epd);
|
2008-11-07 10:02:51 +07:00
|
|
|
return ret;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
int extent_writepages(struct extent_io_tree *tree,
|
|
|
|
struct address_space *mapping,
|
|
|
|
get_extent_t *get_extent,
|
|
|
|
struct writeback_control *wbc)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
struct extent_page_data epd = {
|
|
|
|
.bio = NULL,
|
|
|
|
.tree = tree,
|
|
|
|
.get_extent = get_extent,
|
2008-11-07 10:02:51 +07:00
|
|
|
.extent_locked = 0,
|
2009-04-21 02:50:09 +07:00
|
|
|
.sync_io = wbc->sync_mode == WB_SYNC_ALL,
|
2008-01-25 04:13:08 +07:00
|
|
|
};
|
|
|
|
|
2017-02-11 01:38:24 +07:00
|
|
|
ret = extent_write_cache_pages(mapping, wbc, __extent_writepage, &epd,
|
2008-11-20 00:44:22 +07:00
|
|
|
flush_write_bio);
|
2009-04-21 02:50:09 +07:00
|
|
|
flush_epd_write_bio(&epd);
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int extent_readpages(struct extent_io_tree *tree,
|
|
|
|
struct address_space *mapping,
|
|
|
|
struct list_head *pages, unsigned nr_pages,
|
|
|
|
get_extent_t get_extent)
|
|
|
|
{
|
|
|
|
struct bio *bio = NULL;
|
|
|
|
unsigned page_idx;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
unsigned long bio_flags = 0;
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
struct page *pagepool[16];
|
|
|
|
struct page *page;
|
2013-07-25 18:22:37 +07:00
|
|
|
struct extent_map *em_cached = NULL;
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
int nr = 0;
|
2015-09-28 15:56:26 +07:00
|
|
|
u64 prev_em_start = (u64)-1;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
page = list_entry(pages->prev, struct page, lru);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
prefetchw(&page->flags);
|
|
|
|
list_del(&page->lru);
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
if (add_to_page_cache_lru(page, mapping,
|
2016-07-27 05:24:53 +07:00
|
|
|
page->index,
|
|
|
|
readahead_gfp_mask(mapping))) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
continue;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
|
|
|
|
pagepool[nr++] = page;
|
|
|
|
if (nr < ARRAY_SIZE(pagepool))
|
|
|
|
continue;
|
2013-07-25 18:22:37 +07:00
|
|
|
__extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
|
2016-06-06 02:31:51 +07:00
|
|
|
&bio, 0, &bio_flags, &prev_em_start);
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
nr = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2013-07-25 18:22:36 +07:00
|
|
|
if (nr)
|
2013-07-25 18:22:37 +07:00
|
|
|
__extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
|
2016-06-06 02:31:51 +07:00
|
|
|
&bio, 0, &bio_flags, &prev_em_start);
|
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not
perform well enough.
Here is a scenario in fio jobs:
We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file,
and all of them will race on add_to_page_cache_lru(), and if one thread
successfully puts its page into the page cache, it takes the responsibility
to read the page's data.
And what's more, reading a page needs a period of time to finish, in which
other threads can slide in and process rest pages:
t1 t2 t3 t4
add Page1
read Page1 add Page2
| read Page2 add Page3
| | read Page3 add Page4
| | | read Page4
-----|------------|-----------|-----------|--------
v v v v
bio bio bio bio
Now we have four bios, each of which holds only one page since we need to
maintain consecutive pages in bio. Thus, we can end up with far more bios
than we need.
Here we're going to
a) delay the real read-page section and
b) try to put more pages into page cache.
With that said, we can make each bio hold more pages and reduce the number
of bios we need.
Here is some numbers taken from fio results:
w/o patch w patch
------------- -------- ---------------
READ: 745MB/s +25% 934MB/s
[1]:
[global]
group_reporting
thread
numjobs=4
bs=32k
rw=read
ioengine=sync
directory=/mnt/btrfs/
[READ]
filename=foobar
size=2000M
invalidate=1
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-21 10:43:09 +07:00
|
|
|
|
2013-07-25 18:22:37 +07:00
|
|
|
if (em_cached)
|
|
|
|
free_extent_map(em_cached);
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(!list_empty(pages));
|
|
|
|
if (bio)
|
2016-06-06 02:31:51 +07:00
|
|
|
return submit_one_bio(bio, 0, bio_flags);
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* basic invalidatepage code, this waits on any locked or writeback
|
|
|
|
* ranges corresponding to the page, and then deletes any extent state
|
|
|
|
* records from the tree
|
|
|
|
*/
|
|
|
|
int extent_invalidatepage(struct extent_io_tree *tree,
|
|
|
|
struct page *page, unsigned long offset)
|
|
|
|
{
|
2010-02-04 02:33:23 +07:00
|
|
|
struct extent_state *cached_state = NULL;
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 end = start + PAGE_SIZE - 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t blocksize = page->mapping->host->i_sb->s_blocksize;
|
|
|
|
|
2013-02-26 15:10:22 +07:00
|
|
|
start += ALIGN(offset, blocksize);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (start > end)
|
|
|
|
return 0;
|
|
|
|
|
2015-12-03 20:30:40 +07:00
|
|
|
lock_extent_bits(tree, start, end, &cached_state);
|
2009-09-03 00:24:36 +07:00
|
|
|
wait_on_page_writeback(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
clear_extent_bit(tree, start, end,
|
2009-10-09 00:34:05 +07:00
|
|
|
EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
|
|
|
|
EXTENT_DO_ACCOUNTING,
|
2010-02-04 02:33:23 +07:00
|
|
|
1, 1, &cached_state, GFP_NOFS);
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-04-18 21:29:50 +07:00
|
|
|
/*
|
|
|
|
* a helper for releasepage, this tests for areas of the page that
|
|
|
|
* are locked or under IO and drops the related state bits if it is safe
|
|
|
|
* to drop the page.
|
|
|
|
*/
|
2013-04-26 03:41:01 +07:00
|
|
|
static int try_release_extent_state(struct extent_map_tree *map,
|
|
|
|
struct extent_io_tree *tree,
|
|
|
|
struct page *page, gfp_t mask)
|
2008-04-18 21:29:50 +07:00
|
|
|
{
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 end = start + PAGE_SIZE - 1;
|
2008-04-18 21:29:50 +07:00
|
|
|
int ret = 1;
|
|
|
|
|
2008-07-18 22:56:15 +07:00
|
|
|
if (test_range_bit(tree, start, end,
|
2009-09-03 03:53:46 +07:00
|
|
|
EXTENT_IOBITS, 0, NULL))
|
2008-04-18 21:29:50 +07:00
|
|
|
ret = 0;
|
|
|
|
else {
|
2009-09-24 07:28:46 +07:00
|
|
|
/*
|
|
|
|
* at this point we can safely clear everything except the
|
|
|
|
* locked bit and the nodatasum bit
|
|
|
|
*/
|
2011-02-15 00:52:08 +07:00
|
|
|
ret = clear_extent_bit(tree, start, end,
|
2009-09-24 07:28:46 +07:00
|
|
|
~(EXTENT_LOCKED | EXTENT_NODATASUM),
|
|
|
|
0, 0, NULL, mask);
|
2011-02-15 00:52:08 +07:00
|
|
|
|
|
|
|
/* if clear_extent_bit failed for enomem reasons,
|
|
|
|
* we can't allow the release to continue.
|
|
|
|
*/
|
|
|
|
if (ret < 0)
|
|
|
|
ret = 0;
|
|
|
|
else
|
|
|
|
ret = 1;
|
2008-04-18 21:29:50 +07:00
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
/*
|
|
|
|
* a helper for releasepage. As long as there are no locked extents
|
|
|
|
* in the range corresponding to the page, both state records and extent
|
|
|
|
* map records are removed
|
|
|
|
*/
|
|
|
|
int try_release_extent_mapping(struct extent_map_tree *map,
|
2008-01-29 21:59:12 +07:00
|
|
|
struct extent_io_tree *tree, struct page *page,
|
|
|
|
gfp_t mask)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_map *em;
|
2012-12-21 16:17:45 +07:00
|
|
|
u64 start = page_offset(page);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
u64 end = start + PAGE_SIZE - 1;
|
2008-04-18 21:29:50 +07:00
|
|
|
|
2015-11-07 07:28:21 +07:00
|
|
|
if (gfpflags_allow_blocking(mask) &&
|
2015-12-14 23:42:10 +07:00
|
|
|
page->mapping->host->i_size > SZ_16M) {
|
2008-02-15 22:40:50 +07:00
|
|
|
u64 len;
|
2008-01-29 21:59:12 +07:00
|
|
|
while (start <= end) {
|
2008-02-15 22:40:50 +07:00
|
|
|
len = end - start + 1;
|
2009-09-03 03:24:52 +07:00
|
|
|
write_lock(&map->lock);
|
2008-02-15 22:40:50 +07:00
|
|
|
em = lookup_extent_mapping(map, start, len);
|
2012-02-16 14:23:58 +07:00
|
|
|
if (!em) {
|
2009-09-03 03:24:52 +07:00
|
|
|
write_unlock(&map->lock);
|
2008-01-29 21:59:12 +07:00
|
|
|
break;
|
|
|
|
}
|
2008-07-18 23:01:11 +07:00
|
|
|
if (test_bit(EXTENT_FLAG_PINNED, &em->flags) ||
|
|
|
|
em->start != start) {
|
2009-09-03 03:24:52 +07:00
|
|
|
write_unlock(&map->lock);
|
2008-01-29 21:59:12 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!test_range_bit(tree, em->start,
|
|
|
|
extent_map_end(em) - 1,
|
2009-09-03 03:53:46 +07:00
|
|
|
EXTENT_LOCKED | EXTENT_WRITEBACK,
|
2009-09-03 02:22:30 +07:00
|
|
|
0, NULL)) {
|
2008-01-29 21:59:12 +07:00
|
|
|
remove_extent_mapping(map, em);
|
|
|
|
/* once for the rb tree */
|
|
|
|
free_extent_map(em);
|
|
|
|
}
|
|
|
|
start = extent_map_end(em);
|
2009-09-03 03:24:52 +07:00
|
|
|
write_unlock(&map->lock);
|
2008-01-29 21:59:12 +07:00
|
|
|
|
|
|
|
/* once for us */
|
2008-01-25 04:13:08 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
}
|
|
|
|
}
|
2008-04-18 21:29:50 +07:00
|
|
|
return try_release_extent_state(map, tree, page, mask);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2011-02-24 04:23:20 +07:00
|
|
|
/*
|
|
|
|
* helper function for fiemap, which doesn't want to see any holes.
|
|
|
|
* This maps until we find something past 'last'
|
|
|
|
*/
|
|
|
|
static struct extent_map *get_extent_skip_holes(struct inode *inode,
|
|
|
|
u64 offset,
|
|
|
|
u64 last,
|
|
|
|
get_extent_t *get_extent)
|
|
|
|
{
|
2016-06-15 20:22:56 +07:00
|
|
|
u64 sectorsize = btrfs_inode_sectorsize(inode);
|
2011-02-24 04:23:20 +07:00
|
|
|
struct extent_map *em;
|
|
|
|
u64 len;
|
|
|
|
|
|
|
|
if (offset >= last)
|
|
|
|
return NULL;
|
|
|
|
|
2013-10-31 12:03:04 +07:00
|
|
|
while (1) {
|
2011-02-24 04:23:20 +07:00
|
|
|
len = last - offset;
|
|
|
|
if (len == 0)
|
|
|
|
break;
|
2013-02-26 15:10:22 +07:00
|
|
|
len = ALIGN(len, sectorsize);
|
2017-02-20 18:51:06 +07:00
|
|
|
em = get_extent(BTRFS_I(inode), NULL, 0, offset, len, 0);
|
2011-04-19 23:00:01 +07:00
|
|
|
if (IS_ERR_OR_NULL(em))
|
2011-02-24 04:23:20 +07:00
|
|
|
return em;
|
|
|
|
|
|
|
|
/* if this isn't a hole return it */
|
|
|
|
if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) &&
|
|
|
|
em->block_start != EXTENT_MAP_HOLE) {
|
|
|
|
return em;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* this is a hole, advance to the next extent */
|
|
|
|
offset = extent_map_end(em);
|
|
|
|
free_extent_map(em);
|
|
|
|
if (offset >= last)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
/*
|
|
|
|
* To cache previous fiemap extent
|
|
|
|
*
|
|
|
|
* Will be used for merging fiemap extent
|
|
|
|
*/
|
|
|
|
struct fiemap_cache {
|
|
|
|
u64 offset;
|
|
|
|
u64 phys;
|
|
|
|
u64 len;
|
|
|
|
u32 flags;
|
|
|
|
bool cached;
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Helper to submit fiemap extent.
|
|
|
|
*
|
|
|
|
* Will try to merge current fiemap extent specified by @offset, @phys,
|
|
|
|
* @len and @flags with cached one.
|
|
|
|
* And only when we fails to merge, cached one will be submitted as
|
|
|
|
* fiemap extent.
|
|
|
|
*
|
|
|
|
* Return value is the same as fiemap_fill_next_extent().
|
|
|
|
*/
|
|
|
|
static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo,
|
|
|
|
struct fiemap_cache *cache,
|
|
|
|
u64 offset, u64 phys, u64 len, u32 flags)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!cache->cached)
|
|
|
|
goto assign;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sanity check, extent_fiemap() should have ensured that new
|
|
|
|
* fiemap extent won't overlap with cahced one.
|
|
|
|
* Not recoverable.
|
|
|
|
*
|
|
|
|
* NOTE: Physical address can overlap, due to compression
|
|
|
|
*/
|
|
|
|
if (cache->offset + cache->len > offset) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Only merges fiemap extents if
|
|
|
|
* 1) Their logical addresses are continuous
|
|
|
|
*
|
|
|
|
* 2) Their physical addresses are continuous
|
|
|
|
* So truly compressed (physical size smaller than logical size)
|
|
|
|
* extents won't get merged with each other
|
|
|
|
*
|
|
|
|
* 3) Share same flags except FIEMAP_EXTENT_LAST
|
|
|
|
* So regular extent won't get merged with prealloc extent
|
|
|
|
*/
|
|
|
|
if (cache->offset + cache->len == offset &&
|
|
|
|
cache->phys + cache->len == phys &&
|
|
|
|
(cache->flags & ~FIEMAP_EXTENT_LAST) ==
|
|
|
|
(flags & ~FIEMAP_EXTENT_LAST)) {
|
|
|
|
cache->len += len;
|
|
|
|
cache->flags |= flags;
|
|
|
|
goto try_submit_last;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Not mergeable, need to submit cached one */
|
|
|
|
ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys,
|
|
|
|
cache->len, cache->flags);
|
|
|
|
cache->cached = false;
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
assign:
|
|
|
|
cache->cached = true;
|
|
|
|
cache->offset = offset;
|
|
|
|
cache->phys = phys;
|
|
|
|
cache->len = len;
|
|
|
|
cache->flags = flags;
|
|
|
|
try_submit_last:
|
|
|
|
if (cache->flags & FIEMAP_EXTENT_LAST) {
|
|
|
|
ret = fiemap_fill_next_extent(fieinfo, cache->offset,
|
|
|
|
cache->phys, cache->len, cache->flags);
|
|
|
|
cache->cached = false;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2017-06-22 09:01:21 +07:00
|
|
|
* Emit last fiemap cache
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
*
|
2017-06-22 09:01:21 +07:00
|
|
|
* The last fiemap cache may still be cached in the following case:
|
|
|
|
* 0 4k 8k
|
|
|
|
* |<- Fiemap range ->|
|
|
|
|
* |<------------ First extent ----------->|
|
|
|
|
*
|
|
|
|
* In this case, the first extent range will be cached but not emitted.
|
|
|
|
* So we must emit it before ending extent_fiemap().
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
*/
|
2017-06-22 09:01:21 +07:00
|
|
|
static int emit_last_fiemap_cache(struct btrfs_fs_info *fs_info,
|
|
|
|
struct fiemap_extent_info *fieinfo,
|
|
|
|
struct fiemap_cache *cache)
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!cache->cached)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys,
|
|
|
|
cache->len, cache->flags);
|
|
|
|
cache->cached = false;
|
|
|
|
if (ret > 0)
|
|
|
|
ret = 0;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2009-01-22 02:39:14 +07:00
|
|
|
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
|
|
__u64 start, __u64 len, get_extent_t *get_extent)
|
|
|
|
{
|
2010-11-24 02:36:57 +07:00
|
|
|
int ret = 0;
|
2009-01-22 02:39:14 +07:00
|
|
|
u64 off = start;
|
|
|
|
u64 max = start + len;
|
|
|
|
u32 flags = 0;
|
2010-11-24 02:36:57 +07:00
|
|
|
u32 found_type;
|
|
|
|
u64 last;
|
2011-02-24 04:23:20 +07:00
|
|
|
u64 last_for_get_extent = 0;
|
2009-01-22 02:39:14 +07:00
|
|
|
u64 disko = 0;
|
2011-02-24 04:23:20 +07:00
|
|
|
u64 isize = i_size_read(inode);
|
2010-11-24 02:36:57 +07:00
|
|
|
struct btrfs_key found_key;
|
2009-01-22 02:39:14 +07:00
|
|
|
struct extent_map *em = NULL;
|
2010-02-04 02:33:23 +07:00
|
|
|
struct extent_state *cached_state = NULL;
|
2010-11-24 02:36:57 +07:00
|
|
|
struct btrfs_path *path;
|
2014-09-11 03:20:45 +07:00
|
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
struct fiemap_cache cache = { 0 };
|
2009-01-22 02:39:14 +07:00
|
|
|
int end = 0;
|
2011-02-24 04:23:20 +07:00
|
|
|
u64 em_start = 0;
|
|
|
|
u64 em_len = 0;
|
|
|
|
u64 em_end = 0;
|
2009-01-22 02:39:14 +07:00
|
|
|
|
|
|
|
if (len == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2010-11-24 02:36:57 +07:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
path->leave_spinning = 1;
|
|
|
|
|
2016-06-15 20:22:56 +07:00
|
|
|
start = round_down(start, btrfs_inode_sectorsize(inode));
|
|
|
|
len = round_up(max, btrfs_inode_sectorsize(inode)) - start;
|
2011-11-17 23:34:31 +07:00
|
|
|
|
2011-02-24 04:23:20 +07:00
|
|
|
/*
|
|
|
|
* lookup the last file extent. We're not using i_size here
|
|
|
|
* because there might be preallocation past i_size
|
|
|
|
*/
|
2017-01-20 20:54:07 +07:00
|
|
|
ret = btrfs_lookup_file_extent(NULL, root, path,
|
|
|
|
btrfs_ino(BTRFS_I(inode)), -1, 0);
|
2010-11-24 02:36:57 +07:00
|
|
|
if (ret < 0) {
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
2016-05-18 07:21:48 +07:00
|
|
|
} else {
|
|
|
|
WARN_ON(!ret);
|
|
|
|
if (ret == 1)
|
|
|
|
ret = 0;
|
2010-11-24 02:36:57 +07:00
|
|
|
}
|
2016-05-18 07:21:48 +07:00
|
|
|
|
2010-11-24 02:36:57 +07:00
|
|
|
path->slots[0]--;
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
|
2014-06-04 23:41:45 +07:00
|
|
|
found_type = found_key.type;
|
2010-11-24 02:36:57 +07:00
|
|
|
|
2011-02-24 04:23:20 +07:00
|
|
|
/* No extents, but there might be delalloc bits */
|
2017-01-11 01:35:31 +07:00
|
|
|
if (found_key.objectid != btrfs_ino(BTRFS_I(inode)) ||
|
2010-11-24 02:36:57 +07:00
|
|
|
found_type != BTRFS_EXTENT_DATA_KEY) {
|
2011-02-24 04:23:20 +07:00
|
|
|
/* have to trust i_size as the end */
|
|
|
|
last = (u64)-1;
|
|
|
|
last_for_get_extent = isize;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* remember the start of the last extent. There are a
|
|
|
|
* bunch of different factors that go into the length of the
|
|
|
|
* extent, so its much less complex to remember where it started
|
|
|
|
*/
|
|
|
|
last = found_key.offset;
|
|
|
|
last_for_get_extent = last + 1;
|
2010-11-24 02:36:57 +07:00
|
|
|
}
|
2013-09-22 11:54:23 +07:00
|
|
|
btrfs_release_path(path);
|
2010-11-24 02:36:57 +07:00
|
|
|
|
2011-02-24 04:23:20 +07:00
|
|
|
/*
|
|
|
|
* we might have some extents allocated but more delalloc past those
|
|
|
|
* extents. so, we trust isize unless the start of the last extent is
|
|
|
|
* beyond isize
|
|
|
|
*/
|
|
|
|
if (last < isize) {
|
|
|
|
last = (u64)-1;
|
|
|
|
last_for_get_extent = isize;
|
|
|
|
}
|
|
|
|
|
2015-12-03 20:30:40 +07:00
|
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1,
|
2012-03-01 20:57:19 +07:00
|
|
|
&cached_state);
|
2011-02-24 04:23:20 +07:00
|
|
|
|
2011-11-17 23:34:31 +07:00
|
|
|
em = get_extent_skip_holes(inode, start, last_for_get_extent,
|
2011-02-24 04:23:20 +07:00
|
|
|
get_extent);
|
2009-01-22 02:39:14 +07:00
|
|
|
if (!em)
|
|
|
|
goto out;
|
|
|
|
if (IS_ERR(em)) {
|
|
|
|
ret = PTR_ERR(em);
|
|
|
|
goto out;
|
|
|
|
}
|
2010-11-24 02:36:57 +07:00
|
|
|
|
2009-01-22 02:39:14 +07:00
|
|
|
while (!end) {
|
2013-07-06 00:52:51 +07:00
|
|
|
u64 offset_in_extent = 0;
|
2011-03-08 23:54:40 +07:00
|
|
|
|
|
|
|
/* break if the extent we found is outside the range */
|
|
|
|
if (em->start >= max || extent_map_end(em) < off)
|
|
|
|
break;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* get_extent may return an extent that starts before our
|
|
|
|
* requested range. We have to make sure the ranges
|
|
|
|
* we return to fiemap always move forward and don't
|
|
|
|
* overlap, so adjust the offsets here
|
|
|
|
*/
|
|
|
|
em_start = max(em->start, off);
|
2009-01-22 02:39:14 +07:00
|
|
|
|
2011-03-08 23:54:40 +07:00
|
|
|
/*
|
|
|
|
* record the offset from the start of the extent
|
2013-07-06 00:52:51 +07:00
|
|
|
* for adjusting the disk offset below. Only do this if the
|
|
|
|
* extent isn't compressed since our in ram offset may be past
|
|
|
|
* what we have actually allocated on disk.
|
2011-03-08 23:54:40 +07:00
|
|
|
*/
|
2013-07-06 00:52:51 +07:00
|
|
|
if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
|
|
|
|
offset_in_extent = em_start - em->start;
|
2011-02-24 04:23:20 +07:00
|
|
|
em_end = extent_map_end(em);
|
2011-03-08 23:54:40 +07:00
|
|
|
em_len = em_end - em_start;
|
2009-01-22 02:39:14 +07:00
|
|
|
disko = 0;
|
|
|
|
flags = 0;
|
|
|
|
|
2011-03-08 23:54:40 +07:00
|
|
|
/*
|
|
|
|
* bump off for our next call to get_extent
|
|
|
|
*/
|
|
|
|
off = extent_map_end(em);
|
|
|
|
if (off >= max)
|
|
|
|
end = 1;
|
|
|
|
|
2009-04-03 21:33:45 +07:00
|
|
|
if (em->block_start == EXTENT_MAP_LAST_BYTE) {
|
2009-01-22 02:39:14 +07:00
|
|
|
end = 1;
|
|
|
|
flags |= FIEMAP_EXTENT_LAST;
|
2009-04-03 21:33:45 +07:00
|
|
|
} else if (em->block_start == EXTENT_MAP_INLINE) {
|
2009-01-22 02:39:14 +07:00
|
|
|
flags |= (FIEMAP_EXTENT_DATA_INLINE |
|
|
|
|
FIEMAP_EXTENT_NOT_ALIGNED);
|
2009-04-03 21:33:45 +07:00
|
|
|
} else if (em->block_start == EXTENT_MAP_DELALLOC) {
|
2009-01-22 02:39:14 +07:00
|
|
|
flags |= (FIEMAP_EXTENT_DELALLOC |
|
|
|
|
FIEMAP_EXTENT_UNKNOWN);
|
2014-09-11 03:20:45 +07:00
|
|
|
} else if (fieinfo->fi_extents_max) {
|
|
|
|
u64 bytenr = em->block_start -
|
|
|
|
(em->start - em->orig_start);
|
2013-09-22 11:54:23 +07:00
|
|
|
|
2011-03-08 23:54:40 +07:00
|
|
|
disko = em->block_start + offset_in_extent;
|
2013-09-22 11:54:23 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* As btrfs supports shared space, this information
|
|
|
|
* can be exported to userspace tools via
|
2014-09-11 03:20:45 +07:00
|
|
|
* flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0
|
|
|
|
* then we're just getting a count and we can skip the
|
|
|
|
* lookup stuff.
|
2013-09-22 11:54:23 +07:00
|
|
|
*/
|
2017-06-29 10:56:58 +07:00
|
|
|
ret = btrfs_check_shared(root,
|
|
|
|
btrfs_ino(BTRFS_I(inode)),
|
|
|
|
bytenr);
|
2014-09-11 03:20:45 +07:00
|
|
|
if (ret < 0)
|
2013-09-22 11:54:23 +07:00
|
|
|
goto out_free;
|
2014-09-11 03:20:45 +07:00
|
|
|
if (ret)
|
2013-09-22 11:54:23 +07:00
|
|
|
flags |= FIEMAP_EXTENT_SHARED;
|
2014-09-11 03:20:45 +07:00
|
|
|
ret = 0;
|
2009-01-22 02:39:14 +07:00
|
|
|
}
|
|
|
|
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
|
|
|
|
flags |= FIEMAP_EXTENT_ENCODED;
|
2015-05-19 21:44:04 +07:00
|
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
|
|
flags |= FIEMAP_EXTENT_UNWRITTEN;
|
2009-01-22 02:39:14 +07:00
|
|
|
|
|
|
|
free_extent_map(em);
|
|
|
|
em = NULL;
|
2011-02-24 04:23:20 +07:00
|
|
|
if ((em_start >= last) || em_len == (u64)-1 ||
|
|
|
|
(last == (u64)-1 && isize <= em_end)) {
|
2009-01-22 02:39:14 +07:00
|
|
|
flags |= FIEMAP_EXTENT_LAST;
|
|
|
|
end = 1;
|
|
|
|
}
|
|
|
|
|
2011-02-24 04:23:20 +07:00
|
|
|
/* now scan forward to see if this is really the last extent. */
|
|
|
|
em = get_extent_skip_holes(inode, off, last_for_get_extent,
|
|
|
|
get_extent);
|
|
|
|
if (IS_ERR(em)) {
|
|
|
|
ret = PTR_ERR(em);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!em) {
|
2010-11-24 02:36:57 +07:00
|
|
|
flags |= FIEMAP_EXTENT_LAST;
|
|
|
|
end = 1;
|
|
|
|
}
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko,
|
|
|
|
em_len, flags);
|
2015-03-25 05:12:56 +07:00
|
|
|
if (ret) {
|
|
|
|
if (ret == 1)
|
|
|
|
ret = 0;
|
2011-02-24 04:23:20 +07:00
|
|
|
goto out_free;
|
2015-03-25 05:12:56 +07:00
|
|
|
}
|
2009-01-22 02:39:14 +07:00
|
|
|
}
|
|
|
|
out_free:
|
btrfs: fiemap: Cache and merge fiemap extent before submit it to user
[BUG]
Cycle mount btrfs can cause fiemap to return different result.
Like:
# mount /dev/vdb5 /mnt/btrfs
# dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
# umount /mnt/btrfs
# mount /dev/vdb5 /mnt/btrfs
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 25088..25119 32 0x0
1: [32..63]: 25120..25151 32 0x0
2: [64..95]: 25152..25183 32 0x0
3: [96..127]: 25184..25215 32 0x1
But after above fiemap, we get correct merged result if we call fiemap
again.
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/test/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: 25088..25215 128 0x1
[REASON]
Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1)
|- extent_fiemap(start=0 len=(u64)-1)
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=0 len=64k)
| | Found on-disk (ino, EXTENT_DATA, 0)
| |- add_extent_mapping()
| |- Return (em->start=0, len=16k)
|
|- fiemap_fill_next_extent(logic=0 phys=X len=16k)
|
|- get_extent_skip_holes(start=0 len=64k)
| |- btrfs_get_extent_fiemap(start=0 len=64k)
| |- btrfs_get_extent(start=16k len=48k)
| | Found on-disk (ino, EXTENT_DATA, 16k)
| |- add_extent_mapping()
| | |- try_merge_map()
| | Merge with previous em start=0 len=16k
| | resulting em start=0 len=32k
| |- Return (em->start=0, len=32K) << Merged result
|- Stripe off the unrelated range (0~16K) of return em
|- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K)
^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next
fiemap() call, we will get merged result.
[FIX]
Here we introduce a new structure, fiemap_cache, which records previous
fiemap extent.
And will always try to merge current fiemap_cache result before calling
fiemap_fill_next_extent().
Only when we failed to merge current fiemap extent with cached one, we
will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if
fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap
extent.
So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-04-07 09:43:15 +07:00
|
|
|
if (!ret)
|
2017-06-22 09:01:21 +07:00
|
|
|
ret = emit_last_fiemap_cache(root->fs_info, fieinfo, &cache);
|
2009-01-22 02:39:14 +07:00
|
|
|
free_extent_map(em);
|
|
|
|
out:
|
2013-09-22 11:54:23 +07:00
|
|
|
btrfs_free_path(path);
|
2013-05-01 23:23:41 +07:00
|
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1,
|
2010-02-04 02:33:23 +07:00
|
|
|
&cached_state, GFP_NOFS);
|
2009-01-22 02:39:14 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2010-08-07 00:21:20 +07:00
|
|
|
static void __free_extent_buffer(struct extent_buffer *eb)
|
|
|
|
{
|
2013-04-22 23:12:31 +07:00
|
|
|
btrfs_leak_debug_del(&eb->leak_list);
|
2010-08-07 00:21:20 +07:00
|
|
|
kmem_cache_free(extent_buffer_cache, eb);
|
|
|
|
}
|
|
|
|
|
2014-03-29 04:07:27 +07:00
|
|
|
int extent_buffer_under_io(struct extent_buffer *eb)
|
2013-08-08 01:54:37 +07:00
|
|
|
{
|
|
|
|
return (atomic_read(&eb->io_pages) ||
|
|
|
|
test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) ||
|
|
|
|
test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Helper for releasing extent buffer page.
|
|
|
|
*/
|
2014-07-31 05:51:36 +07:00
|
|
|
static void btrfs_release_extent_buffer_page(struct extent_buffer *eb)
|
2013-08-08 01:54:37 +07:00
|
|
|
{
|
|
|
|
unsigned long index;
|
|
|
|
struct page *page;
|
|
|
|
int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags);
|
|
|
|
|
|
|
|
BUG_ON(extent_buffer_under_io(eb));
|
|
|
|
|
2014-07-31 05:51:36 +07:00
|
|
|
index = num_extent_pages(eb->start, eb->len);
|
|
|
|
if (index == 0)
|
2013-08-08 01:54:37 +07:00
|
|
|
return;
|
|
|
|
|
|
|
|
do {
|
|
|
|
index--;
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[index];
|
2015-02-09 16:31:45 +07:00
|
|
|
if (!page)
|
|
|
|
continue;
|
|
|
|
if (mapped)
|
2013-08-08 01:54:37 +07:00
|
|
|
spin_lock(&page->mapping->private_lock);
|
2015-02-09 16:31:45 +07:00
|
|
|
/*
|
|
|
|
* We do this since we'll remove the pages after we've
|
|
|
|
* removed the eb from the radix tree, so we could race
|
|
|
|
* and have this page now attached to the new eb. So
|
|
|
|
* only clear page_private if it's still connected to
|
|
|
|
* this eb.
|
|
|
|
*/
|
|
|
|
if (PagePrivate(page) &&
|
|
|
|
page->private == (unsigned long)eb) {
|
|
|
|
BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
|
|
BUG_ON(PageDirty(page));
|
|
|
|
BUG_ON(PageWriteback(page));
|
2013-08-08 01:54:37 +07:00
|
|
|
/*
|
2015-02-09 16:31:45 +07:00
|
|
|
* We need to make sure we haven't be attached
|
|
|
|
* to a new eb.
|
2013-08-08 01:54:37 +07:00
|
|
|
*/
|
2015-02-09 16:31:45 +07:00
|
|
|
ClearPagePrivate(page);
|
|
|
|
set_page_private(page, 0);
|
|
|
|
/* One for the page private */
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
2013-08-08 01:54:37 +07:00
|
|
|
}
|
2015-02-09 16:31:45 +07:00
|
|
|
|
|
|
|
if (mapped)
|
|
|
|
spin_unlock(&page->mapping->private_lock);
|
|
|
|
|
2016-05-20 08:18:45 +07:00
|
|
|
/* One for when we allocated the page */
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(page);
|
2014-07-31 05:51:36 +07:00
|
|
|
} while (index != 0);
|
2013-08-08 01:54:37 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Helper for releasing the extent buffer.
|
|
|
|
*/
|
|
|
|
static inline void btrfs_release_extent_buffer(struct extent_buffer *eb)
|
|
|
|
{
|
2014-07-31 05:51:36 +07:00
|
|
|
btrfs_release_extent_buffer_page(eb);
|
2013-08-08 01:54:37 +07:00
|
|
|
__free_extent_buffer(eb);
|
|
|
|
}
|
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
static struct extent_buffer *
|
|
|
|
__alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
|
2014-06-15 07:55:29 +07:00
|
|
|
unsigned long len)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
struct extent_buffer *eb = NULL;
|
|
|
|
|
2015-08-19 19:17:40 +07:00
|
|
|
eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS|__GFP_NOFAIL);
|
2008-01-25 04:13:08 +07:00
|
|
|
eb->start = start;
|
|
|
|
eb->len = len;
|
2013-12-17 01:24:27 +07:00
|
|
|
eb->fs_info = fs_info;
|
2012-05-16 22:00:02 +07:00
|
|
|
eb->bflags = 0;
|
2011-07-17 02:23:14 +07:00
|
|
|
rwlock_init(&eb->lock);
|
|
|
|
atomic_set(&eb->write_locks, 0);
|
|
|
|
atomic_set(&eb->read_locks, 0);
|
|
|
|
atomic_set(&eb->blocking_readers, 0);
|
|
|
|
atomic_set(&eb->blocking_writers, 0);
|
|
|
|
atomic_set(&eb->spinning_readers, 0);
|
|
|
|
atomic_set(&eb->spinning_writers, 0);
|
2011-09-13 15:55:48 +07:00
|
|
|
eb->lock_nested = 0;
|
2011-07-17 02:23:14 +07:00
|
|
|
init_waitqueue_head(&eb->write_lock_wq);
|
|
|
|
init_waitqueue_head(&eb->read_lock_wq);
|
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 21:25:08 +07:00
|
|
|
|
2013-04-22 23:12:31 +07:00
|
|
|
btrfs_leak_debug_add(&eb->leak_list, &buffers);
|
|
|
|
|
2012-03-10 04:01:49 +07:00
|
|
|
spin_lock_init(&eb->refs_lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
atomic_set(&eb->refs, 1);
|
2012-03-13 20:38:00 +07:00
|
|
|
atomic_set(&eb->io_pages, 0);
|
2010-08-07 00:21:20 +07:00
|
|
|
|
2013-02-28 21:54:18 +07:00
|
|
|
/*
|
|
|
|
* Sanity checks, currently the maximum is 64k covered by 16x 4k pages
|
|
|
|
*/
|
|
|
|
BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE
|
|
|
|
> MAX_INLINE_EXTENT_BUFFER_SIZE);
|
|
|
|
BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
return eb;
|
|
|
|
}
|
|
|
|
|
2012-05-16 22:00:02 +07:00
|
|
|
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
|
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
struct page *p;
|
|
|
|
struct extent_buffer *new;
|
|
|
|
unsigned long num_pages = num_extent_pages(src->start, src->len);
|
|
|
|
|
2014-06-15 08:20:26 +07:00
|
|
|
new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
|
2012-05-16 22:00:02 +07:00
|
|
|
if (new == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2013-08-08 03:57:23 +07:00
|
|
|
p = alloc_page(GFP_NOFS);
|
2013-08-08 01:54:37 +07:00
|
|
|
if (!p) {
|
|
|
|
btrfs_release_extent_buffer(new);
|
|
|
|
return NULL;
|
|
|
|
}
|
2012-05-16 22:00:02 +07:00
|
|
|
attach_extent_buffer_page(new, p);
|
|
|
|
WARN_ON(PageDirty(p));
|
|
|
|
SetPageUptodate(p);
|
|
|
|
new->pages[i] = p;
|
2016-11-08 23:56:24 +07:00
|
|
|
copy_page(page_address(p), page_address(src->pages[i]));
|
2012-05-16 22:00:02 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);
|
|
|
|
set_bit(EXTENT_BUFFER_DUMMY, &new->bflags);
|
|
|
|
|
|
|
|
return new;
|
|
|
|
}
|
|
|
|
|
2015-09-30 10:50:31 +07:00
|
|
|
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
|
|
u64 start, unsigned long len)
|
2012-05-16 22:00:02 +07:00
|
|
|
{
|
|
|
|
struct extent_buffer *eb;
|
2014-06-15 08:20:26 +07:00
|
|
|
unsigned long num_pages;
|
2012-05-16 22:00:02 +07:00
|
|
|
unsigned long i;
|
|
|
|
|
2015-09-30 10:50:31 +07:00
|
|
|
num_pages = num_extent_pages(start, len);
|
2014-06-15 08:20:26 +07:00
|
|
|
|
|
|
|
eb = __alloc_extent_buffer(fs_info, start, len);
|
2012-05-16 22:00:02 +07:00
|
|
|
if (!eb)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2013-08-08 03:57:23 +07:00
|
|
|
eb->pages[i] = alloc_page(GFP_NOFS);
|
2012-05-16 22:00:02 +07:00
|
|
|
if (!eb->pages[i])
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
set_extent_buffer_uptodate(eb);
|
|
|
|
btrfs_set_header_nritems(eb, 0);
|
|
|
|
set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags);
|
|
|
|
|
|
|
|
return eb;
|
|
|
|
err:
|
2012-10-11 20:25:16 +07:00
|
|
|
for (; i > 0; i--)
|
|
|
|
__free_page(eb->pages[i - 1]);
|
2012-05-16 22:00:02 +07:00
|
|
|
__free_extent_buffer(eb);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2015-09-30 10:50:31 +07:00
|
|
|
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
|
2016-06-15 20:22:56 +07:00
|
|
|
u64 start)
|
2015-09-30 10:50:31 +07:00
|
|
|
{
|
2016-06-15 20:22:56 +07:00
|
|
|
return __alloc_dummy_extent_buffer(fs_info, start, fs_info->nodesize);
|
2015-09-30 10:50:31 +07:00
|
|
|
}
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
static void check_buffer_tree_ref(struct extent_buffer *eb)
|
|
|
|
{
|
2013-01-30 05:49:37 +07:00
|
|
|
int refs;
|
2012-03-13 20:38:00 +07:00
|
|
|
/* the ref bit is tricky. We have to make sure it is set
|
|
|
|
* if we have the buffer dirty. Otherwise the
|
|
|
|
* code to free a buffer can end up dropping a dirty
|
|
|
|
* page
|
|
|
|
*
|
|
|
|
* Once the ref bit is set, it won't go away while the
|
|
|
|
* buffer is dirty or in writeback, and it also won't
|
|
|
|
* go away while we have the reference count on the
|
|
|
|
* eb bumped.
|
|
|
|
*
|
|
|
|
* We can't just set the ref bit without bumping the
|
|
|
|
* ref on the eb because free_extent_buffer might
|
|
|
|
* see the ref bit and try to clear it. If this happens
|
|
|
|
* free_extent_buffer might end up dropping our original
|
|
|
|
* ref by mistake and freeing the page before we are able
|
|
|
|
* to add one more ref.
|
|
|
|
*
|
|
|
|
* So bump the ref count first, then set the bit. If someone
|
|
|
|
* beat us to it, drop the ref we added.
|
|
|
|
*/
|
2013-01-30 05:49:37 +07:00
|
|
|
refs = atomic_read(&eb->refs);
|
|
|
|
if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
|
|
|
|
return;
|
|
|
|
|
2012-07-21 03:11:08 +07:00
|
|
|
spin_lock(&eb->refs_lock);
|
|
|
|
if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
|
2012-03-13 20:38:00 +07:00
|
|
|
atomic_inc(&eb->refs);
|
2012-07-21 03:11:08 +07:00
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
}
|
|
|
|
|
2014-06-05 06:10:31 +07:00
|
|
|
static void mark_extent_buffer_accessed(struct extent_buffer *eb,
|
|
|
|
struct page *accessed)
|
2012-03-16 05:24:42 +07:00
|
|
|
{
|
|
|
|
unsigned long num_pages, i;
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
check_buffer_tree_ref(eb);
|
|
|
|
|
2012-03-16 05:24:42 +07:00
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
struct page *p = eb->pages[i];
|
|
|
|
|
2014-06-05 06:10:31 +07:00
|
|
|
if (p != accessed)
|
|
|
|
mark_page_accessed(p);
|
2012-03-16 05:24:42 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
|
|
u64 start)
|
2013-10-07 22:45:25 +07:00
|
|
|
{
|
|
|
|
struct extent_buffer *eb;
|
|
|
|
|
|
|
|
rcu_read_lock();
|
2013-12-17 01:24:27 +07:00
|
|
|
eb = radix_tree_lookup(&fs_info->buffer_radix,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
start >> PAGE_SHIFT);
|
2013-10-07 22:45:25 +07:00
|
|
|
if (eb && atomic_inc_not_zero(&eb->refs)) {
|
|
|
|
rcu_read_unlock();
|
2015-04-23 17:28:48 +07:00
|
|
|
/*
|
|
|
|
* Lock our eb's refs_lock to avoid races with
|
|
|
|
* free_extent_buffer. When we get our eb it might be flagged
|
|
|
|
* with EXTENT_BUFFER_STALE and another task running
|
|
|
|
* free_extent_buffer might have seen that flag set,
|
|
|
|
* eb->refs == 2, that the buffer isn't under IO (dirty and
|
|
|
|
* writeback flags not set) and it's still in the tree (flag
|
|
|
|
* EXTENT_BUFFER_TREE_REF set), therefore being in the process
|
|
|
|
* of decrementing the extent buffer's reference count twice.
|
|
|
|
* So here we could race and increment the eb's reference count,
|
|
|
|
* clear its stale flag, mark it as dirty and drop our reference
|
|
|
|
* before the other task finishes executing free_extent_buffer,
|
|
|
|
* which would later result in an attempt to free an extent
|
|
|
|
* buffer that is dirty.
|
|
|
|
*/
|
|
|
|
if (test_bit(EXTENT_BUFFER_STALE, &eb->bflags)) {
|
|
|
|
spin_lock(&eb->refs_lock);
|
|
|
|
spin_unlock(&eb->refs_lock);
|
|
|
|
}
|
2014-06-05 06:10:31 +07:00
|
|
|
mark_extent_buffer_accessed(eb, NULL);
|
2013-10-07 22:45:25 +07:00
|
|
|
return eb;
|
|
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2014-05-08 04:06:09 +07:00
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
|
|
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
|
2016-06-15 20:22:56 +07:00
|
|
|
u64 start)
|
2014-05-08 04:06:09 +07:00
|
|
|
{
|
|
|
|
struct extent_buffer *eb, *exists = NULL;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
eb = find_extent_buffer(fs_info, start);
|
|
|
|
if (eb)
|
|
|
|
return eb;
|
2016-06-15 20:22:56 +07:00
|
|
|
eb = alloc_dummy_extent_buffer(fs_info, start);
|
2014-05-08 04:06:09 +07:00
|
|
|
if (!eb)
|
|
|
|
return NULL;
|
|
|
|
eb->fs_info = fs_info;
|
|
|
|
again:
|
2016-05-09 19:11:38 +07:00
|
|
|
ret = radix_tree_preload(GFP_NOFS);
|
2014-05-08 04:06:09 +07:00
|
|
|
if (ret)
|
|
|
|
goto free_eb;
|
|
|
|
spin_lock(&fs_info->buffer_lock);
|
|
|
|
ret = radix_tree_insert(&fs_info->buffer_radix,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
start >> PAGE_SHIFT, eb);
|
2014-05-08 04:06:09 +07:00
|
|
|
spin_unlock(&fs_info->buffer_lock);
|
|
|
|
radix_tree_preload_end();
|
|
|
|
if (ret == -EEXIST) {
|
|
|
|
exists = find_extent_buffer(fs_info, start);
|
|
|
|
if (exists)
|
|
|
|
goto free_eb;
|
|
|
|
else
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
check_buffer_tree_ref(eb);
|
|
|
|
set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We will free dummy extent buffer's if they come into
|
|
|
|
* free_extent_buffer with a ref count of 2, but if we are using this we
|
|
|
|
* want the buffers to stay in memory until we're done with them, so
|
|
|
|
* bump the ref count again.
|
|
|
|
*/
|
|
|
|
atomic_inc(&eb->refs);
|
|
|
|
return eb;
|
|
|
|
free_eb:
|
|
|
|
btrfs_release_extent_buffer(eb);
|
|
|
|
return exists;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
|
2014-06-15 08:00:04 +07:00
|
|
|
u64 start)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2016-06-15 20:22:56 +07:00
|
|
|
unsigned long len = fs_info->nodesize;
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned long num_pages = num_extent_pages(start, len);
|
|
|
|
unsigned long i;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
unsigned long index = start >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct extent_buffer *eb;
|
2008-07-22 22:18:07 +07:00
|
|
|
struct extent_buffer *exists = NULL;
|
2008-01-25 04:13:08 +07:00
|
|
|
struct page *p;
|
2013-12-17 01:24:27 +07:00
|
|
|
struct address_space *mapping = fs_info->btree_inode->i_mapping;
|
2008-01-25 04:13:08 +07:00
|
|
|
int uptodate = 1;
|
2010-10-27 07:57:29 +07:00
|
|
|
int ret;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2016-06-15 20:22:56 +07:00
|
|
|
if (!IS_ALIGNED(start, fs_info->sectorsize)) {
|
2016-06-07 02:01:23 +07:00
|
|
|
btrfs_err(fs_info, "bad tree block start %llu", start);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
}
|
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
eb = find_extent_buffer(fs_info, start);
|
2013-10-07 22:45:25 +07:00
|
|
|
if (eb)
|
2008-07-22 22:18:07 +07:00
|
|
|
return eb;
|
|
|
|
|
2014-06-15 07:55:29 +07:00
|
|
|
eb = __alloc_extent_buffer(fs_info, start, len);
|
2008-04-01 22:21:40 +07:00
|
|
|
if (!eb)
|
2016-06-07 02:01:23 +07:00
|
|
|
return ERR_PTR(-ENOMEM);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2010-08-07 00:21:20 +07:00
|
|
|
for (i = 0; i < num_pages; i++, index++) {
|
2015-08-19 19:17:40 +07:00
|
|
|
p = find_or_create_page(mapping, index, GFP_NOFS|__GFP_NOFAIL);
|
2016-06-07 02:01:23 +07:00
|
|
|
if (!p) {
|
|
|
|
exists = ERR_PTR(-ENOMEM);
|
2008-07-22 22:18:07 +07:00
|
|
|
goto free_eb;
|
2016-06-07 02:01:23 +07:00
|
|
|
}
|
2012-03-08 04:20:05 +07:00
|
|
|
|
|
|
|
spin_lock(&mapping->private_lock);
|
|
|
|
if (PagePrivate(p)) {
|
|
|
|
/*
|
|
|
|
* We could have already allocated an eb for this page
|
|
|
|
* and attached one so lets see if we can get a ref on
|
|
|
|
* the existing eb, and if we can we know it's good and
|
|
|
|
* we can just return that one, else we know we can just
|
|
|
|
* overwrite page->private.
|
|
|
|
*/
|
|
|
|
exists = (struct extent_buffer *)p->private;
|
|
|
|
if (atomic_inc_not_zero(&exists->refs)) {
|
|
|
|
spin_unlock(&mapping->private_lock);
|
|
|
|
unlock_page(p);
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(p);
|
2014-06-05 06:10:31 +07:00
|
|
|
mark_extent_buffer_accessed(exists, p);
|
2012-03-08 04:20:05 +07:00
|
|
|
goto free_eb;
|
|
|
|
}
|
2015-02-24 17:47:05 +07:00
|
|
|
exists = NULL;
|
2012-03-08 04:20:05 +07:00
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
/*
|
2012-03-08 04:20:05 +07:00
|
|
|
* Do this so attach doesn't complain and we need to
|
|
|
|
* drop the ref the old guy had.
|
|
|
|
*/
|
|
|
|
ClearPagePrivate(p);
|
2012-03-13 20:38:00 +07:00
|
|
|
WARN_ON(PageDirty(p));
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
put_page(p);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2012-03-08 04:20:05 +07:00
|
|
|
attach_extent_buffer_page(eb, p);
|
|
|
|
spin_unlock(&mapping->private_lock);
|
2012-03-13 20:38:00 +07:00
|
|
|
WARN_ON(PageDirty(p));
|
2010-08-07 00:21:20 +07:00
|
|
|
eb->pages[i] = p;
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!PageUptodate(p))
|
|
|
|
uptodate = 0;
|
2011-02-11 00:35:00 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* see below about how we avoid a nasty race with release page
|
|
|
|
* and why we unlock later
|
|
|
|
*/
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
if (uptodate)
|
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 21:25:08 +07:00
|
|
|
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
2012-03-09 21:51:43 +07:00
|
|
|
again:
|
2016-05-09 19:11:38 +07:00
|
|
|
ret = radix_tree_preload(GFP_NOFS);
|
2016-06-07 02:01:23 +07:00
|
|
|
if (ret) {
|
|
|
|
exists = ERR_PTR(ret);
|
2010-10-27 07:57:29 +07:00
|
|
|
goto free_eb;
|
2016-06-07 02:01:23 +07:00
|
|
|
}
|
2010-10-27 07:57:29 +07:00
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
spin_lock(&fs_info->buffer_lock);
|
|
|
|
ret = radix_tree_insert(&fs_info->buffer_radix,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
start >> PAGE_SHIFT, eb);
|
2013-12-17 01:24:27 +07:00
|
|
|
spin_unlock(&fs_info->buffer_lock);
|
2013-10-07 22:45:25 +07:00
|
|
|
radix_tree_preload_end();
|
2010-10-27 07:57:29 +07:00
|
|
|
if (ret == -EEXIST) {
|
2013-12-17 01:24:27 +07:00
|
|
|
exists = find_extent_buffer(fs_info, start);
|
2013-10-07 22:45:25 +07:00
|
|
|
if (exists)
|
|
|
|
goto free_eb;
|
|
|
|
else
|
2012-03-09 21:51:43 +07:00
|
|
|
goto again;
|
2008-07-22 22:18:07 +07:00
|
|
|
}
|
|
|
|
/* add one reference for the tree */
|
2012-03-13 20:38:00 +07:00
|
|
|
check_buffer_tree_ref(eb);
|
2013-12-13 22:41:51 +07:00
|
|
|
set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags);
|
2011-02-11 00:35:00 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* there is a race where release page may have
|
|
|
|
* tried to find this extent buffer in the radix
|
|
|
|
* but failed. It will tell the VM it is safe to
|
|
|
|
* reclaim the, and it will clear the page private bit.
|
|
|
|
* We must make sure to set the page private bit properly
|
|
|
|
* after the extent buffer is in the radix tree so
|
|
|
|
* it doesn't get lost
|
|
|
|
*/
|
2010-08-07 00:21:20 +07:00
|
|
|
SetPageChecked(eb->pages[0]);
|
|
|
|
for (i = 1; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
p = eb->pages[i];
|
2010-08-07 00:21:20 +07:00
|
|
|
ClearPageChecked(p);
|
|
|
|
unlock_page(p);
|
|
|
|
}
|
|
|
|
unlock_page(eb->pages[0]);
|
2008-01-25 04:13:08 +07:00
|
|
|
return eb;
|
|
|
|
|
2008-07-22 22:18:07 +07:00
|
|
|
free_eb:
|
2015-02-24 17:47:05 +07:00
|
|
|
WARN_ON(!atomic_dec_and_test(&eb->refs));
|
2010-08-07 00:21:20 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
|
|
if (eb->pages[i])
|
|
|
|
unlock_page(eb->pages[i]);
|
|
|
|
}
|
2011-02-11 00:35:00 +07:00
|
|
|
|
2010-10-27 07:57:29 +07:00
|
|
|
btrfs_release_extent_buffer(eb);
|
2008-07-22 22:18:07 +07:00
|
|
|
return exists;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2012-03-10 04:01:49 +07:00
|
|
|
static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
|
|
|
|
{
|
|
|
|
struct extent_buffer *eb =
|
|
|
|
container_of(head, struct extent_buffer, rcu_head);
|
|
|
|
|
|
|
|
__free_extent_buffer(eb);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Expects to have eb->eb_lock already held */
|
2013-04-26 21:56:29 +07:00
|
|
|
static int release_extent_buffer(struct extent_buffer *eb)
|
2012-03-10 04:01:49 +07:00
|
|
|
{
|
|
|
|
WARN_ON(atomic_read(&eb->refs) == 0);
|
|
|
|
if (atomic_dec_and_test(&eb->refs)) {
|
2013-12-13 22:41:51 +07:00
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {
|
2013-12-17 01:24:27 +07:00
|
|
|
struct btrfs_fs_info *fs_info = eb->fs_info;
|
2012-03-10 04:01:49 +07:00
|
|
|
|
2012-05-16 22:00:02 +07:00
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-03-10 04:01:49 +07:00
|
|
|
|
2013-12-17 01:24:27 +07:00
|
|
|
spin_lock(&fs_info->buffer_lock);
|
|
|
|
radix_tree_delete(&fs_info->buffer_radix,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
eb->start >> PAGE_SHIFT);
|
2013-12-17 01:24:27 +07:00
|
|
|
spin_unlock(&fs_info->buffer_lock);
|
2013-12-13 22:41:51 +07:00
|
|
|
} else {
|
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-05-16 22:00:02 +07:00
|
|
|
}
|
2012-03-10 04:01:49 +07:00
|
|
|
|
|
|
|
/* Should be safe to release our pages at this point */
|
2014-07-31 05:51:36 +07:00
|
|
|
btrfs_release_extent_buffer_page(eb);
|
2015-03-17 04:38:02 +07:00
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
|
|
if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))) {
|
|
|
|
__free_extent_buffer(eb);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif
|
2012-03-10 04:01:49 +07:00
|
|
|
call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu);
|
2012-07-21 03:05:36 +07:00
|
|
|
return 1;
|
2012-03-10 04:01:49 +07:00
|
|
|
}
|
|
|
|
spin_unlock(&eb->refs_lock);
|
2012-07-21 03:05:36 +07:00
|
|
|
|
|
|
|
return 0;
|
2012-03-10 04:01:49 +07:00
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
void free_extent_buffer(struct extent_buffer *eb)
|
|
|
|
{
|
2013-01-30 05:49:37 +07:00
|
|
|
int refs;
|
|
|
|
int old;
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!eb)
|
|
|
|
return;
|
|
|
|
|
2013-01-30 05:49:37 +07:00
|
|
|
while (1) {
|
|
|
|
refs = atomic_read(&eb->refs);
|
|
|
|
if (refs <= 3)
|
|
|
|
break;
|
|
|
|
old = atomic_cmpxchg(&eb->refs, refs, refs - 1);
|
|
|
|
if (old == refs)
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-03-10 04:01:49 +07:00
|
|
|
spin_lock(&eb->refs_lock);
|
2012-05-16 22:00:02 +07:00
|
|
|
if (atomic_read(&eb->refs) == 2 &&
|
|
|
|
test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))
|
|
|
|
atomic_dec(&eb->refs);
|
|
|
|
|
2012-03-10 04:01:49 +07:00
|
|
|
if (atomic_read(&eb->refs) == 2 &&
|
|
|
|
test_bit(EXTENT_BUFFER_STALE, &eb->bflags) &&
|
2012-03-13 20:38:00 +07:00
|
|
|
!extent_buffer_under_io(eb) &&
|
2012-03-10 04:01:49 +07:00
|
|
|
test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
|
|
|
|
atomic_dec(&eb->refs);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* I know this is terrible, but it's temporary until we stop tracking
|
|
|
|
* the uptodate bits and such for the extent buffers.
|
|
|
|
*/
|
2013-04-26 21:56:29 +07:00
|
|
|
release_extent_buffer(eb);
|
2012-03-10 04:01:49 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
void free_extent_buffer_stale(struct extent_buffer *eb)
|
|
|
|
{
|
|
|
|
if (!eb)
|
2008-01-25 04:13:08 +07:00
|
|
|
return;
|
|
|
|
|
2012-03-10 04:01:49 +07:00
|
|
|
spin_lock(&eb->refs_lock);
|
|
|
|
set_bit(EXTENT_BUFFER_STALE, &eb->bflags);
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) &&
|
2012-03-10 04:01:49 +07:00
|
|
|
test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
|
|
|
|
atomic_dec(&eb->refs);
|
2013-04-26 21:56:29 +07:00
|
|
|
release_extent_buffer(eb);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2012-03-29 07:31:37 +07:00
|
|
|
void clear_extent_buffer_dirty(struct extent_buffer *eb)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
unsigned long num_pages;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
|
|
|
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2009-03-13 22:00:37 +07:00
|
|
|
if (!PageDirty(page))
|
2008-11-20 00:44:22 +07:00
|
|
|
continue;
|
|
|
|
|
2008-07-22 22:18:08 +07:00
|
|
|
lock_page(page);
|
2011-02-11 00:35:00 +07:00
|
|
|
WARN_ON(!PagePrivate(page));
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
clear_page_dirty_for_io(page);
|
2008-07-31 03:54:26 +07:00
|
|
|
spin_lock_irq(&page->mapping->tree_lock);
|
2008-01-25 04:13:08 +07:00
|
|
|
if (!PageDirty(page)) {
|
|
|
|
radix_tree_tag_clear(&page->mapping->page_tree,
|
|
|
|
page_index(page),
|
|
|
|
PAGECACHE_TAG_DIRTY);
|
|
|
|
}
|
2008-07-31 03:54:26 +07:00
|
|
|
spin_unlock_irq(&page->mapping->tree_lock);
|
2011-11-04 23:29:37 +07:00
|
|
|
ClearPageError(page);
|
2008-07-22 22:18:08 +07:00
|
|
|
unlock_page(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2012-03-13 20:38:00 +07:00
|
|
|
WARN_ON(atomic_read(&eb->refs) == 0);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
int set_extent_buffer_dirty(struct extent_buffer *eb)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
unsigned long num_pages;
|
2009-03-13 22:00:37 +07:00
|
|
|
int was_dirty = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
check_buffer_tree_ref(eb);
|
|
|
|
|
2009-03-13 22:00:37 +07:00
|
|
|
was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
|
2012-03-13 20:38:00 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
2012-03-10 04:01:49 +07:00
|
|
|
WARN_ON(atomic_read(&eb->refs) == 0);
|
2012-03-13 20:38:00 +07:00
|
|
|
WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags));
|
|
|
|
|
2009-03-13 22:00:37 +07:00
|
|
|
for (i = 0; i < num_pages; i++)
|
2014-07-31 06:03:53 +07:00
|
|
|
set_page_dirty(eb->pages[i]);
|
2009-03-13 22:00:37 +07:00
|
|
|
return was_dirty;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2015-12-03 19:08:59 +07:00
|
|
|
void clear_extent_buffer_uptodate(struct extent_buffer *eb)
|
2008-05-13 00:39:03 +07:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
struct page *page;
|
|
|
|
unsigned long num_pages;
|
|
|
|
|
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 21:25:08 +07:00
|
|
|
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
2012-03-13 20:38:00 +07:00
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
2008-05-13 00:39:03 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-07-30 21:29:12 +07:00
|
|
|
if (page)
|
|
|
|
ClearPageUptodate(page);
|
2008-05-13 00:39:03 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-12-03 19:08:59 +07:00
|
|
|
void set_extent_buffer_uptodate(struct extent_buffer *eb)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
struct page *page;
|
|
|
|
unsigned long num_pages;
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
2008-01-25 04:13:08 +07:00
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
SetPageUptodate(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-03-13 20:38:00 +07:00
|
|
|
int extent_buffer_uptodate(struct extent_buffer *eb)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
2012-03-13 20:38:00 +07:00
|
|
|
return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
int read_extent_buffer_pages(struct extent_io_tree *tree,
|
2016-09-03 02:40:03 +07:00
|
|
|
struct extent_buffer *eb, int wait,
|
2008-04-10 03:28:12 +07:00
|
|
|
get_extent_t *get_extent, int mirror_num)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
struct page *page;
|
|
|
|
int err;
|
|
|
|
int ret = 0;
|
2008-04-10 03:28:12 +07:00
|
|
|
int locked_pages = 0;
|
|
|
|
int all_uptodate = 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned long num_pages;
|
2010-08-07 00:21:20 +07:00
|
|
|
unsigned long num_reads = 0;
|
2008-02-07 22:50:54 +07:00
|
|
|
struct bio *bio = NULL;
|
Btrfs: Add zlib compression support
This is a large change for adding compression on reading and writing,
both for inline and regular extents. It does some fairly large
surgery to the writeback paths.
Compression is off by default and enabled by mount -o compress. Even
when the -o compress mount option is not used, it is possible to read
compressed extents off the disk.
If compression for a given set of pages fails to make them smaller, the
file is flagged to avoid future compression attempts later.
* While finding delalloc extents, the pages are locked before being sent down
to the delalloc handler. This allows the delalloc handler to do complex things
such as cleaning the pages, marking them writeback and starting IO on their
behalf.
* Inline extents are inserted at delalloc time now. This allows us to compress
the data before inserting the inline extent, and it allows us to insert
an inline extent that spans multiple pages.
* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)
are changed to record both an in-memory size and an on disk size, as well
as a flag for compression.
From a disk format point of view, the extent pointers in the file are changed
to record the on disk size of a given extent and some encoding flags.
Space in the disk format is allocated for compression encoding, as well
as encryption and a generic 'other' field. Neither the encryption or the
'other' field are currently used.
In order to limit the amount of data read for a single random read in the
file, the size of a compressed extent is limited to 128k. This is a
software only limit, the disk format supports u64 sized compressed extents.
In order to limit the ram consumed while processing extents, the uncompressed
size of a compressed extent is limited to 256k. This is a software only limit
and will be subject to tuning later.
Checksumming is still done on compressed extents, and it is done on the
uncompressed version of the data. This way additional encodings can be
layered on without having to figure out which encoding to checksum.
Compression happens at delalloc time, which is basically singled threaded because
it is usually done by a single pdflush thread. This makes it tricky to
spread the compression load across all the cpus on the box. We'll have to
look at parallel pdflush walks of dirty inodes at a later time.
Decompression is hooked into readpages and it does spread across CPUs nicely.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30 01:49:59 +07:00
|
|
|
unsigned long bio_flags = 0;
|
2008-02-07 22:50:54 +07:00
|
|
|
|
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 21:25:08 +07:00
|
|
|
if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
num_pages = num_extent_pages(eb->start, eb->len);
|
2016-09-03 02:40:03 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2011-06-10 19:06:53 +07:00
|
|
|
if (wait == WAIT_NONE) {
|
2008-08-07 22:19:43 +07:00
|
|
|
if (!trylock_page(page))
|
2008-04-10 03:28:12 +07:00
|
|
|
goto unlock_exit;
|
2008-01-25 04:13:08 +07:00
|
|
|
} else {
|
|
|
|
lock_page(page);
|
|
|
|
}
|
2008-04-10 03:28:12 +07:00
|
|
|
locked_pages++;
|
Btrfs: fix memory leak in reading btree blocks
So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
3) doesn't count them for eb->io_pages, but they are later
cleared by 2) so we has to readpage on the page, we get
the wrong eb->io_pages which results in a memory leak of
this block.
This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.
t1(readahead) t2(readahead endio) t3(the following read)
read_extent_buffer_pages end_bio_extent_readpage
for pg in eb: for page 0,1,2 in eb:
if pg is uptodate: btree_readpage_end_io_hook(pg)
num_reads++ if uptodate:
eb->io_pages = num_reads SetPageUptodate(pg) _______________
for pg in eb: for page 3 in eb: read_extent_buffer_pages
if pg is NOT uptodate: btree_readpage_end_io_hook(pg) for pg in eb:
__extent_read_full_page(pg) sanity check reports something wrong if pg is uptodate:
clear_extent_buffer_uptodate(eb) num_reads++
for pg in eb: eb->io_pages = num_reads
ClearPageUptodate(page) _______________
for pg in eb:
if pg is NOT uptodate:
__extent_read_full_page(pg)
So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2016-08-04 02:33:01 +07:00
|
|
|
}
|
|
|
|
/*
|
|
|
|
* We need to firstly lock all pages to make sure that
|
|
|
|
* the uptodate bit of our pages won't be affected by
|
|
|
|
* clear_extent_buffer_uptodate().
|
|
|
|
*/
|
2016-09-03 02:40:03 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
Btrfs: fix memory leak in reading btree blocks
So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
3) doesn't count them for eb->io_pages, but they are later
cleared by 2) so we has to readpage on the page, we get
the wrong eb->io_pages which results in a memory leak of
this block.
This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.
t1(readahead) t2(readahead endio) t3(the following read)
read_extent_buffer_pages end_bio_extent_readpage
for pg in eb: for page 0,1,2 in eb:
if pg is uptodate: btree_readpage_end_io_hook(pg)
num_reads++ if uptodate:
eb->io_pages = num_reads SetPageUptodate(pg) _______________
for pg in eb: for page 3 in eb: read_extent_buffer_pages
if pg is NOT uptodate: btree_readpage_end_io_hook(pg) for pg in eb:
__extent_read_full_page(pg) sanity check reports something wrong if pg is uptodate:
clear_extent_buffer_uptodate(eb) num_reads++
for pg in eb: eb->io_pages = num_reads
ClearPageUptodate(page) _______________
for pg in eb:
if pg is NOT uptodate:
__extent_read_full_page(pg)
So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2016-08-04 02:33:01 +07:00
|
|
|
page = eb->pages[i];
|
2010-08-07 00:21:20 +07:00
|
|
|
if (!PageUptodate(page)) {
|
|
|
|
num_reads++;
|
2008-04-10 03:28:12 +07:00
|
|
|
all_uptodate = 0;
|
2010-08-07 00:21:20 +07:00
|
|
|
}
|
2008-04-10 03:28:12 +07:00
|
|
|
}
|
Btrfs: fix memory leak in reading btree blocks
So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
3) doesn't count them for eb->io_pages, but they are later
cleared by 2) so we has to readpage on the page, we get
the wrong eb->io_pages which results in a memory leak of
this block.
This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.
t1(readahead) t2(readahead endio) t3(the following read)
read_extent_buffer_pages end_bio_extent_readpage
for pg in eb: for page 0,1,2 in eb:
if pg is uptodate: btree_readpage_end_io_hook(pg)
num_reads++ if uptodate:
eb->io_pages = num_reads SetPageUptodate(pg) _______________
for pg in eb: for page 3 in eb: read_extent_buffer_pages
if pg is NOT uptodate: btree_readpage_end_io_hook(pg) for pg in eb:
__extent_read_full_page(pg) sanity check reports something wrong if pg is uptodate:
clear_extent_buffer_uptodate(eb) num_reads++
for pg in eb: eb->io_pages = num_reads
ClearPageUptodate(page) _______________
for pg in eb:
if pg is NOT uptodate:
__extent_read_full_page(pg)
So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2016-08-04 02:33:01 +07:00
|
|
|
|
2008-04-10 03:28:12 +07:00
|
|
|
if (all_uptodate) {
|
2016-09-03 02:40:03 +07:00
|
|
|
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
2008-04-10 03:28:12 +07:00
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
Btrfs: be aware of btree inode write errors to avoid fs corruption
While we have a transaction ongoing, the VM might decide at any time
to call btree_inode->i_mapping->a_ops->writepages(), which will start
writeback of dirty pages belonging to btree nodes/leafs. This call
might return an error or the writeback might finish with an error
before we attempt to commit the running transaction. If this happens,
we might have no way of knowing that such error happened when we are
committing the transaction - because the pages might no longer be
marked dirty nor tagged for writeback (if a subsequent modification
to the extent buffer didn't happen before the transaction commit) which
makes filemap_fdata[write|wait]_range unable to find such pages (even
if they're marked with SetPageError).
So if this happens we must abort the transaction, otherwise we commit
a super block with btree roots that point to btree nodes/leafs whose
content on disk is invalid - either garbage or the content of some
node/leaf from a past generation that got cowed or deleted and is no
longer valid (for this later case we end up getting error messages like
"parent transid verify failed on 10826481664 wanted 25748 found 29562"
when reading btree nodes/leafs from disk).
Note that setting and checking AS_EIO/AS_ENOSPC in the btree inode's
i_mapping would not be enough because we need to distinguish between
log tree extents (not fatal) vs non-log tree extents (fatal) and
because the next call to filemap_fdatawait_range() will catch and clear
such errors in the mapping - and that call might be from a log sync and
not from a transaction commit, which means we would not know about the
error at transaction commit time. Also, checking for the eb flag
EXTENT_BUFFER_IOERR at transaction commit time isn't done and would
not be completely reliable, as the eb might be removed from memory and
read back when trying to get it, which clears that flag right before
reading the eb's pages from disk, making us not know about the previous
write error.
Using the new 3 flags for the btree inode also makes us achieve the
goal of AS_EIO/AS_ENOSPC when writepages() returns success, started
writeback for all dirty pages and before filemap_fdatawait_range() is
called, the writeback for all dirty pages had already finished with
errors - because we were not using AS_EIO/AS_ENOSPC,
filemap_fdatawait_range() would return success, as it could not know
that writeback errors happened (the pages were no longer tagged for
writeback).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-09-26 18:25:56 +07:00
|
|
|
clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
|
2012-04-16 20:42:26 +07:00
|
|
|
eb->read_mirror = 0;
|
2012-03-13 20:38:00 +07:00
|
|
|
atomic_set(&eb->io_pages, num_reads);
|
2016-09-03 02:40:03 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2016-07-12 00:39:07 +07:00
|
|
|
|
2008-04-10 03:28:12 +07:00
|
|
|
if (!PageUptodate(page)) {
|
2016-07-12 00:39:07 +07:00
|
|
|
if (ret) {
|
|
|
|
atomic_dec(&eb->io_pages);
|
|
|
|
unlock_page(page);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2008-04-10 03:28:12 +07:00
|
|
|
ClearPageError(page);
|
2008-02-07 22:50:54 +07:00
|
|
|
err = __extent_read_full_page(tree, page,
|
2008-04-10 03:28:12 +07:00
|
|
|
get_extent, &bio,
|
2013-04-20 06:49:09 +07:00
|
|
|
mirror_num, &bio_flags,
|
2016-06-06 02:31:51 +07:00
|
|
|
REQ_META);
|
2016-07-12 00:39:07 +07:00
|
|
|
if (err) {
|
2008-01-25 04:13:08 +07:00
|
|
|
ret = err;
|
2016-07-12 00:39:07 +07:00
|
|
|
/*
|
|
|
|
* We use &bio in above __extent_read_full_page,
|
|
|
|
* so we ensure that if it returns error, the
|
|
|
|
* current page fails to add itself to bio and
|
|
|
|
* it's been unlocked.
|
|
|
|
*
|
|
|
|
* We must dec io_pages by ourselves.
|
|
|
|
*/
|
|
|
|
atomic_dec(&eb->io_pages);
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
} else {
|
|
|
|
unlock_page(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-10-04 10:23:14 +07:00
|
|
|
if (bio) {
|
2016-06-06 02:31:51 +07:00
|
|
|
err = submit_one_bio(bio, mirror_num, bio_flags);
|
2012-03-12 22:03:00 +07:00
|
|
|
if (err)
|
|
|
|
return err;
|
2011-10-04 10:23:14 +07:00
|
|
|
}
|
2008-02-07 22:50:54 +07:00
|
|
|
|
2011-06-10 19:06:53 +07:00
|
|
|
if (ret || wait != WAIT_COMPLETE)
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
2009-01-06 09:25:51 +07:00
|
|
|
|
2016-09-03 02:40:03 +07:00
|
|
|
for (i = 0; i < num_pages; i++) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
wait_on_page_locked(page);
|
2009-01-06 09:25:51 +07:00
|
|
|
if (!PageUptodate(page))
|
2008-01-25 04:13:08 +07:00
|
|
|
ret = -EIO;
|
|
|
|
}
|
2009-01-06 09:25:51 +07:00
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
return ret;
|
2008-04-10 03:28:12 +07:00
|
|
|
|
|
|
|
unlock_exit:
|
2009-01-06 09:25:51 +07:00
|
|
|
while (locked_pages > 0) {
|
2008-04-10 03:28:12 +07:00
|
|
|
locked_pages--;
|
2016-09-03 02:40:03 +07:00
|
|
|
page = eb->pages[locked_pages];
|
|
|
|
unlock_page(page);
|
2008-04-10 03:28:12 +07:00
|
|
|
}
|
|
|
|
return ret;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
2017-06-29 10:56:53 +07:00
|
|
|
void read_extent_buffer(const struct extent_buffer *eb, void *dstv,
|
|
|
|
unsigned long start, unsigned long len)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
|
|
|
char *dst = (char *)dstv;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
Btrfs: fix out of bounds array access while reading extent buffer
There is a corner case that slips through the checkers in functions
reading extent buffer, ie.
if (start < eb->len) and (start + len > eb->len),
then
a) map_private_extent_buffer() returns immediately because
it's thinking the range spans across two pages,
b) and the checkers in read_extent_buffer(), WARN_ON(start > eb->len)
and WARN_ON(start + len > eb->start + eb->len), both are OK in this
corner case, but it'd actually try to access the eb->pages out of
bounds because of (start + len > eb->len).
The case is found by switching extent inline ref type from shared data
ref to non-shared data ref, which is a kind of metadata corruption.
It'd use the wrong helper to access the eb,
eg. btrfs_extent_data_ref_root(eb, ref) is used but the %ref passing
here is "struct btrfs_shared_data_ref". And if the extent item
happens to be the first item in the eb, then offset/length will get
over eb->len which ends up an invalid memory access.
This is adding proper checks in order to avoid invalid memory access,
ie. 'general protection fault', before it's too late.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-08-10 00:10:16 +07:00
|
|
|
if (start + len > eb->len) {
|
|
|
|
WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n",
|
|
|
|
eb->start, eb->len, start, len);
|
|
|
|
memset(dst, 0, len);
|
|
|
|
return;
|
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset = (start_offset + start) & (PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, (PAGE_SIZE - offset));
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
memcpy(dst, kaddr + offset, cur);
|
|
|
|
|
|
|
|
dst += cur;
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-06-29 10:56:53 +07:00
|
|
|
int read_extent_buffer_to_user(const struct extent_buffer *eb,
|
|
|
|
void __user *dstv,
|
|
|
|
unsigned long start, unsigned long len)
|
2014-01-30 22:24:01 +07:00
|
|
|
{
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
|
|
|
char __user *dst = (char __user *)dstv;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2014-01-30 22:24:01 +07:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
WARN_ON(start > eb->len);
|
|
|
|
WARN_ON(start + len > eb->start + eb->len);
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset = (start_offset + start) & (PAGE_SIZE - 1);
|
2014-01-30 22:24:01 +07:00
|
|
|
|
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2014-01-30 22:24:01 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, (PAGE_SIZE - offset));
|
2014-01-30 22:24:01 +07:00
|
|
|
kaddr = page_address(page);
|
|
|
|
if (copy_to_user(dst, kaddr + offset, cur)) {
|
|
|
|
ret = -EFAULT;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
dst += cur;
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2016-06-18 09:16:21 +07:00
|
|
|
/*
|
|
|
|
* return 0 if the item is found within a page.
|
|
|
|
* return 1 if the item spans two pages.
|
|
|
|
* return -EINVAL otherwise.
|
|
|
|
*/
|
2017-06-29 10:56:53 +07:00
|
|
|
int map_private_extent_buffer(const struct extent_buffer *eb,
|
|
|
|
unsigned long start, unsigned long min_len,
|
|
|
|
char **map, unsigned long *map_start,
|
|
|
|
unsigned long *map_len)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t offset = start & (PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
char *kaddr;
|
|
|
|
struct page *p;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned long end_i = (start_offset + start + min_len - 1) >>
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
Btrfs: fix out of bounds array access while reading extent buffer
There is a corner case that slips through the checkers in functions
reading extent buffer, ie.
if (start < eb->len) and (start + len > eb->len),
then
a) map_private_extent_buffer() returns immediately because
it's thinking the range spans across two pages,
b) and the checkers in read_extent_buffer(), WARN_ON(start > eb->len)
and WARN_ON(start + len > eb->start + eb->len), both are OK in this
corner case, but it'd actually try to access the eb->pages out of
bounds because of (start + len > eb->len).
The case is found by switching extent inline ref type from shared data
ref to non-shared data ref, which is a kind of metadata corruption.
It'd use the wrong helper to access the eb,
eg. btrfs_extent_data_ref_root(eb, ref) is used but the %ref passing
here is "struct btrfs_shared_data_ref". And if the extent item
happens to be the first item in the eb, then offset/length will get
over eb->len which ends up an invalid memory access.
This is adding proper checks in order to avoid invalid memory access,
ie. 'general protection fault', before it's too late.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2017-08-10 00:10:16 +07:00
|
|
|
if (start + min_len > eb->len) {
|
|
|
|
WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n",
|
|
|
|
eb->start, eb->len, start, min_len);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
if (i != end_i)
|
2016-06-18 09:16:21 +07:00
|
|
|
return 1;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
if (i == 0) {
|
|
|
|
offset = start_offset;
|
|
|
|
*map_start = 0;
|
|
|
|
} else {
|
|
|
|
offset = 0;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
*map_start = ((u64)i << PAGE_SHIFT) - start_offset;
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
2009-01-06 09:25:51 +07:00
|
|
|
|
2014-07-31 06:03:53 +07:00
|
|
|
p = eb->pages[i];
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(p);
|
2008-01-25 04:13:08 +07:00
|
|
|
*map = kaddr + offset;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
*map_len = PAGE_SIZE - offset;
|
2008-01-25 04:13:08 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-06-29 10:56:53 +07:00
|
|
|
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
|
|
|
|
unsigned long start, unsigned long len)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
|
|
|
char *ptr = (char *)ptrv;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
WARN_ON(start > eb->len);
|
|
|
|
WARN_ON(start + len > eb->start + eb->len);
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset = (start_offset + start) & (PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, (PAGE_SIZE - offset));
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
ret = memcmp(ptr, kaddr + offset, cur);
|
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
|
|
|
|
ptr += cur;
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2016-11-09 23:43:38 +07:00
|
|
|
void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
|
|
|
|
const void *srcv)
|
|
|
|
{
|
|
|
|
char *kaddr;
|
|
|
|
|
|
|
|
WARN_ON(!PageUptodate(eb->pages[0]));
|
|
|
|
kaddr = page_address(eb->pages[0]);
|
|
|
|
memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv,
|
|
|
|
BTRFS_FSID_SIZE);
|
|
|
|
}
|
|
|
|
|
|
|
|
void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv)
|
|
|
|
{
|
|
|
|
char *kaddr;
|
|
|
|
|
|
|
|
WARN_ON(!PageUptodate(eb->pages[0]));
|
|
|
|
kaddr = page_address(eb->pages[0]);
|
|
|
|
memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv,
|
|
|
|
BTRFS_FSID_SIZE);
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
|
|
|
|
unsigned long start, unsigned long len)
|
|
|
|
{
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
|
|
|
char *src = (char *)srcv;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
WARN_ON(start > eb->len);
|
|
|
|
WARN_ON(start + len > eb->start + eb->len);
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset = (start_offset + start) & (PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, PAGE_SIZE - offset);
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
memcpy(kaddr + offset, src, cur);
|
|
|
|
|
|
|
|
src += cur;
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-09 00:09:03 +07:00
|
|
|
void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
|
|
|
unsigned long len)
|
2008-01-25 04:13:08 +07:00
|
|
|
{
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + start) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
WARN_ON(start > eb->len);
|
|
|
|
WARN_ON(start + len > eb->start + eb->len);
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
offset = (start_offset + start) & (PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = eb->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, PAGE_SIZE - offset);
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(page);
|
2016-11-09 00:09:03 +07:00
|
|
|
memset(kaddr + offset, 0, cur);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-09 00:30:31 +07:00
|
|
|
void copy_extent_buffer_full(struct extent_buffer *dst,
|
|
|
|
struct extent_buffer *src)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
unsigned num_pages;
|
|
|
|
|
|
|
|
ASSERT(dst->len == src->len);
|
|
|
|
|
|
|
|
num_pages = num_extent_pages(dst->start, dst->len);
|
|
|
|
for (i = 0; i < num_pages; i++)
|
|
|
|
copy_page(page_address(dst->pages[i]),
|
|
|
|
page_address(src->pages[i]));
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
|
|
|
|
unsigned long dst_offset, unsigned long src_offset,
|
|
|
|
unsigned long len)
|
|
|
|
{
|
|
|
|
u64 dst_len = dst->len;
|
|
|
|
size_t cur;
|
|
|
|
size_t offset;
|
|
|
|
struct page *page;
|
|
|
|
char *kaddr;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1);
|
|
|
|
unsigned long i = (start_offset + dst_offset) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
WARN_ON(src->len != dst_len);
|
|
|
|
|
|
|
|
offset = (start_offset + dst_offset) &
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2014-07-31 06:03:53 +07:00
|
|
|
page = dst->pages[i];
|
2008-01-25 04:13:08 +07:00
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, (unsigned long)(PAGE_SIZE - offset));
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2011-07-19 23:04:14 +07:00
|
|
|
kaddr = page_address(page);
|
2008-01-25 04:13:08 +07:00
|
|
|
read_extent_buffer(src, kaddr + offset, src_offset, cur);
|
|
|
|
|
|
|
|
src_offset += cur;
|
|
|
|
len -= cur;
|
|
|
|
offset = 0;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-09-23 07:24:20 +07:00
|
|
|
void le_bitmap_set(u8 *map, unsigned int start, int len)
|
|
|
|
{
|
|
|
|
u8 *p = map + BIT_BYTE(start);
|
|
|
|
const unsigned int size = start + len;
|
|
|
|
int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE);
|
|
|
|
u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start);
|
|
|
|
|
|
|
|
while (len - bits_to_set >= 0) {
|
|
|
|
*p |= mask_to_set;
|
|
|
|
len -= bits_to_set;
|
|
|
|
bits_to_set = BITS_PER_BYTE;
|
2016-10-12 15:33:21 +07:00
|
|
|
mask_to_set = ~0;
|
2016-09-23 07:24:20 +07:00
|
|
|
p++;
|
|
|
|
}
|
|
|
|
if (len) {
|
|
|
|
mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
|
|
|
|
*p |= mask_to_set;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void le_bitmap_clear(u8 *map, unsigned int start, int len)
|
|
|
|
{
|
|
|
|
u8 *p = map + BIT_BYTE(start);
|
|
|
|
const unsigned int size = start + len;
|
|
|
|
int bits_to_clear = BITS_PER_BYTE - (start % BITS_PER_BYTE);
|
|
|
|
u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(start);
|
|
|
|
|
|
|
|
while (len - bits_to_clear >= 0) {
|
|
|
|
*p &= ~mask_to_clear;
|
|
|
|
len -= bits_to_clear;
|
|
|
|
bits_to_clear = BITS_PER_BYTE;
|
2016-10-12 15:33:21 +07:00
|
|
|
mask_to_clear = ~0;
|
2016-09-23 07:24:20 +07:00
|
|
|
p++;
|
|
|
|
}
|
|
|
|
if (len) {
|
|
|
|
mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
|
|
|
|
*p &= ~mask_to_clear;
|
|
|
|
}
|
|
|
|
}
|
2015-09-30 10:50:30 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* eb_bitmap_offset() - calculate the page and offset of the byte containing the
|
|
|
|
* given bit number
|
|
|
|
* @eb: the extent buffer
|
|
|
|
* @start: offset of the bitmap item in the extent buffer
|
|
|
|
* @nr: bit number
|
|
|
|
* @page_index: return index of the page in the extent buffer that contains the
|
|
|
|
* given bit number
|
|
|
|
* @page_offset: return offset into the page given by page_index
|
|
|
|
*
|
|
|
|
* This helper hides the ugliness of finding the byte in an extent buffer which
|
|
|
|
* contains a given bit.
|
|
|
|
*/
|
|
|
|
static inline void eb_bitmap_offset(struct extent_buffer *eb,
|
|
|
|
unsigned long start, unsigned long nr,
|
|
|
|
unsigned long *page_index,
|
|
|
|
size_t *page_offset)
|
|
|
|
{
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
|
2015-09-30 10:50:30 +07:00
|
|
|
size_t byte_offset = BIT_BYTE(nr);
|
|
|
|
size_t offset;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The byte we want is the offset of the extent buffer + the offset of
|
|
|
|
* the bitmap item in the extent buffer + the offset of the byte in the
|
|
|
|
* bitmap item.
|
|
|
|
*/
|
|
|
|
offset = start_offset + start + byte_offset;
|
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
*page_index = offset >> PAGE_SHIFT;
|
|
|
|
*page_offset = offset & (PAGE_SIZE - 1);
|
2015-09-30 10:50:30 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* extent_buffer_test_bit - determine whether a bit in a bitmap item is set
|
|
|
|
* @eb: the extent buffer
|
|
|
|
* @start: offset of the bitmap item in the extent buffer
|
|
|
|
* @nr: bit number to test
|
|
|
|
*/
|
|
|
|
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
|
|
|
|
unsigned long nr)
|
|
|
|
{
|
2016-09-23 07:24:20 +07:00
|
|
|
u8 *kaddr;
|
2015-09-30 10:50:30 +07:00
|
|
|
struct page *page;
|
|
|
|
unsigned long i;
|
|
|
|
size_t offset;
|
|
|
|
|
|
|
|
eb_bitmap_offset(eb, start, nr, &i, &offset);
|
|
|
|
page = eb->pages[i];
|
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
kaddr = page_address(page);
|
|
|
|
return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1)));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* extent_buffer_bitmap_set - set an area of a bitmap
|
|
|
|
* @eb: the extent buffer
|
|
|
|
* @start: offset of the bitmap item in the extent buffer
|
|
|
|
* @pos: bit number of the first bit
|
|
|
|
* @len: number of bits to set
|
|
|
|
*/
|
|
|
|
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
|
|
|
|
unsigned long pos, unsigned long len)
|
|
|
|
{
|
2016-09-23 07:24:20 +07:00
|
|
|
u8 *kaddr;
|
2015-09-30 10:50:30 +07:00
|
|
|
struct page *page;
|
|
|
|
unsigned long i;
|
|
|
|
size_t offset;
|
|
|
|
const unsigned int size = pos + len;
|
|
|
|
int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
|
2016-09-23 07:24:20 +07:00
|
|
|
u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos);
|
2015-09-30 10:50:30 +07:00
|
|
|
|
|
|
|
eb_bitmap_offset(eb, start, pos, &i, &offset);
|
|
|
|
page = eb->pages[i];
|
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
kaddr = page_address(page);
|
|
|
|
|
|
|
|
while (len >= bits_to_set) {
|
|
|
|
kaddr[offset] |= mask_to_set;
|
|
|
|
len -= bits_to_set;
|
|
|
|
bits_to_set = BITS_PER_BYTE;
|
2016-10-12 15:33:21 +07:00
|
|
|
mask_to_set = ~0;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
if (++offset >= PAGE_SIZE && len > 0) {
|
2015-09-30 10:50:30 +07:00
|
|
|
offset = 0;
|
|
|
|
page = eb->pages[++i];
|
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
kaddr = page_address(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (len) {
|
|
|
|
mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
|
|
|
|
kaddr[offset] |= mask_to_set;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* extent_buffer_bitmap_clear - clear an area of a bitmap
|
|
|
|
* @eb: the extent buffer
|
|
|
|
* @start: offset of the bitmap item in the extent buffer
|
|
|
|
* @pos: bit number of the first bit
|
|
|
|
* @len: number of bits to clear
|
|
|
|
*/
|
|
|
|
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
|
|
|
|
unsigned long pos, unsigned long len)
|
|
|
|
{
|
2016-09-23 07:24:20 +07:00
|
|
|
u8 *kaddr;
|
2015-09-30 10:50:30 +07:00
|
|
|
struct page *page;
|
|
|
|
unsigned long i;
|
|
|
|
size_t offset;
|
|
|
|
const unsigned int size = pos + len;
|
|
|
|
int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
|
2016-09-23 07:24:20 +07:00
|
|
|
u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos);
|
2015-09-30 10:50:30 +07:00
|
|
|
|
|
|
|
eb_bitmap_offset(eb, start, pos, &i, &offset);
|
|
|
|
page = eb->pages[i];
|
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
kaddr = page_address(page);
|
|
|
|
|
|
|
|
while (len >= bits_to_clear) {
|
|
|
|
kaddr[offset] &= ~mask_to_clear;
|
|
|
|
len -= bits_to_clear;
|
|
|
|
bits_to_clear = BITS_PER_BYTE;
|
2016-10-12 15:33:21 +07:00
|
|
|
mask_to_clear = ~0;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
if (++offset >= PAGE_SIZE && len > 0) {
|
2015-09-30 10:50:30 +07:00
|
|
|
offset = 0;
|
|
|
|
page = eb->pages[++i];
|
|
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
kaddr = page_address(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (len) {
|
|
|
|
mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
|
|
|
|
kaddr[offset] &= ~mask_to_clear;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-04-12 04:52:52 +07:00
|
|
|
static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len)
|
|
|
|
{
|
|
|
|
unsigned long distance = (src > dst) ? src - dst : dst - src;
|
|
|
|
return distance < len;
|
|
|
|
}
|
|
|
|
|
2008-01-25 04:13:08 +07:00
|
|
|
static void copy_pages(struct page *dst_page, struct page *src_page,
|
|
|
|
unsigned long dst_off, unsigned long src_off,
|
|
|
|
unsigned long len)
|
|
|
|
{
|
2011-07-19 23:04:14 +07:00
|
|
|
char *dst_kaddr = page_address(dst_page);
|
2008-01-25 04:13:08 +07:00
|
|
|
char *src_kaddr;
|
2010-08-07 00:21:20 +07:00
|
|
|
int must_memmove = 0;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2011-04-12 04:52:52 +07:00
|
|
|
if (dst_page != src_page) {
|
2011-07-19 23:04:14 +07:00
|
|
|
src_kaddr = page_address(src_page);
|
2011-04-12 04:52:52 +07:00
|
|
|
} else {
|
2008-01-25 04:13:08 +07:00
|
|
|
src_kaddr = dst_kaddr;
|
2010-08-07 00:21:20 +07:00
|
|
|
if (areas_overlap(src_off, dst_off, len))
|
|
|
|
must_memmove = 1;
|
2011-04-12 04:52:52 +07:00
|
|
|
}
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2010-08-07 00:21:20 +07:00
|
|
|
if (must_memmove)
|
|
|
|
memmove(dst_kaddr + dst_off, src_kaddr + src_off, len);
|
|
|
|
else
|
|
|
|
memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len);
|
2008-01-25 04:13:08 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
|
|
|
|
unsigned long src_offset, unsigned long len)
|
|
|
|
{
|
2016-06-23 05:54:23 +07:00
|
|
|
struct btrfs_fs_info *fs_info = dst->fs_info;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t cur;
|
|
|
|
size_t dst_off_in_page;
|
|
|
|
size_t src_off_in_page;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned long dst_i;
|
|
|
|
unsigned long src_i;
|
|
|
|
|
|
|
|
if (src_offset + len > dst->len) {
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_err(fs_info,
|
2016-09-20 21:05:00 +07:00
|
|
|
"memmove bogus src_offset %lu move len %lu dst len %lu",
|
|
|
|
src_offset, len, dst->len);
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(1);
|
|
|
|
}
|
|
|
|
if (dst_offset + len > dst->len) {
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_err(fs_info,
|
2016-09-20 21:05:00 +07:00
|
|
|
"memmove bogus dst_offset %lu move len %lu dst len %lu",
|
|
|
|
dst_offset, len, dst->len);
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(1);
|
|
|
|
}
|
|
|
|
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
2008-01-25 04:13:08 +07:00
|
|
|
dst_off_in_page = (start_offset + dst_offset) &
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
src_off_in_page = (start_offset + src_offset) &
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
dst_i = (start_offset + dst_offset) >> PAGE_SHIFT;
|
|
|
|
src_i = (start_offset + src_offset) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
cur = min(len, (unsigned long)(PAGE_SIZE -
|
2008-01-25 04:13:08 +07:00
|
|
|
src_off_in_page));
|
|
|
|
cur = min_t(unsigned long, cur,
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(unsigned long)(PAGE_SIZE - dst_off_in_page));
|
2008-01-25 04:13:08 +07:00
|
|
|
|
2014-07-31 06:03:53 +07:00
|
|
|
copy_pages(dst->pages[dst_i], dst->pages[src_i],
|
2008-01-25 04:13:08 +07:00
|
|
|
dst_off_in_page, src_off_in_page, cur);
|
|
|
|
|
|
|
|
src_offset += cur;
|
|
|
|
dst_offset += cur;
|
|
|
|
len -= cur;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
|
|
|
|
unsigned long src_offset, unsigned long len)
|
|
|
|
{
|
2016-06-23 05:54:23 +07:00
|
|
|
struct btrfs_fs_info *fs_info = dst->fs_info;
|
2008-01-25 04:13:08 +07:00
|
|
|
size_t cur;
|
|
|
|
size_t dst_off_in_page;
|
|
|
|
size_t src_off_in_page;
|
|
|
|
unsigned long dst_end = dst_offset + len - 1;
|
|
|
|
unsigned long src_end = src_offset + len - 1;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
unsigned long dst_i;
|
|
|
|
unsigned long src_i;
|
|
|
|
|
|
|
|
if (src_offset + len > dst->len) {
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_err(fs_info,
|
2016-09-20 21:05:00 +07:00
|
|
|
"memmove bogus src_offset %lu move len %lu len %lu",
|
|
|
|
src_offset, len, dst->len);
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(1);
|
|
|
|
}
|
|
|
|
if (dst_offset + len > dst->len) {
|
2016-06-23 05:54:23 +07:00
|
|
|
btrfs_err(fs_info,
|
2016-09-20 21:05:00 +07:00
|
|
|
"memmove bogus dst_offset %lu move len %lu len %lu",
|
|
|
|
dst_offset, len, dst->len);
|
2008-01-25 04:13:08 +07:00
|
|
|
BUG_ON(1);
|
|
|
|
}
|
2010-08-07 00:21:20 +07:00
|
|
|
if (dst_offset < src_offset) {
|
2008-01-25 04:13:08 +07:00
|
|
|
memcpy_extent_buffer(dst, dst_offset, src_offset, len);
|
|
|
|
return;
|
|
|
|
}
|
2009-01-06 09:25:51 +07:00
|
|
|
while (len > 0) {
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
dst_i = (start_offset + dst_end) >> PAGE_SHIFT;
|
|
|
|
src_i = (start_offset + src_end) >> PAGE_SHIFT;
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
dst_off_in_page = (start_offset + dst_end) &
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
src_off_in_page = (start_offset + src_end) &
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 19:29:47 +07:00
|
|
|
(PAGE_SIZE - 1);
|
2008-01-25 04:13:08 +07:00
|
|
|
|
|
|
|
cur = min_t(unsigned long, len, src_off_in_page + 1);
|
|
|
|
cur = min(cur, dst_off_in_page + 1);
|
2014-07-31 06:03:53 +07:00
|
|
|
copy_pages(dst->pages[dst_i], dst->pages[src_i],
|
2008-01-25 04:13:08 +07:00
|
|
|
dst_off_in_page - cur + 1,
|
|
|
|
src_off_in_page - cur + 1, cur);
|
|
|
|
|
|
|
|
dst_end -= cur;
|
|
|
|
src_end -= cur;
|
|
|
|
len -= cur;
|
|
|
|
}
|
|
|
|
}
|
2008-07-22 22:18:07 +07:00
|
|
|
|
2013-04-26 21:56:29 +07:00
|
|
|
int try_release_extent_buffer(struct page *page)
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2010-10-27 07:57:29 +07:00
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{
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2008-07-22 22:18:07 +07:00
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struct extent_buffer *eb;
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2012-03-10 04:01:49 +07:00
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/*
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2016-05-20 08:18:45 +07:00
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* We need to make sure nobody is attaching this page to an eb right
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2012-03-10 04:01:49 +07:00
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* now.
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*/
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spin_lock(&page->mapping->private_lock);
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if (!PagePrivate(page)) {
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spin_unlock(&page->mapping->private_lock);
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2012-03-08 04:20:05 +07:00
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return 1;
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2010-11-22 10:27:44 +07:00
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}
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2008-07-22 22:18:07 +07:00
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2012-03-10 04:01:49 +07:00
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eb = (struct extent_buffer *)page->private;
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BUG_ON(!eb);
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2010-10-27 07:57:29 +07:00
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/*
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2012-03-10 04:01:49 +07:00
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* This is a little awful but should be ok, we need to make sure that
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* the eb doesn't disappear out from under us while we're looking at
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* this page.
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2010-10-27 07:57:29 +07:00
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*/
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2012-03-10 04:01:49 +07:00
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spin_lock(&eb->refs_lock);
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2012-03-13 20:38:00 +07:00
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if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) {
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2012-03-10 04:01:49 +07:00
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spin_unlock(&eb->refs_lock);
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spin_unlock(&page->mapping->private_lock);
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return 0;
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2009-03-13 22:00:37 +07:00
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}
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2012-03-10 04:01:49 +07:00
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spin_unlock(&page->mapping->private_lock);
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2010-10-27 07:57:29 +07:00
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2010-10-27 07:57:29 +07:00
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/*
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2012-03-10 04:01:49 +07:00
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* If tree ref isn't set then we know the ref on this eb is a real ref,
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* so just return, this page will likely be freed soon anyway.
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2010-10-27 07:57:29 +07:00
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*/
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2012-03-10 04:01:49 +07:00
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if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) {
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spin_unlock(&eb->refs_lock);
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return 0;
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2009-03-13 22:00:37 +07:00
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}
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2010-10-27 07:57:29 +07:00
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2013-04-26 21:56:29 +07:00
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return release_extent_buffer(eb);
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2008-07-22 22:18:07 +07:00
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}
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