2019-05-19 19:08:55 +07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2005-04-17 05:20:36 +07:00
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/*
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* (C) 1997 Linus Torvalds
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2011-05-27 20:28:01 +07:00
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* (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation)
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2005-04-17 05:20:36 +07:00
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*/
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2011-12-08 01:17:19 +07:00
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#include <linux/export.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/backing-dev.h>
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#include <linux/hash.h>
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#include <linux/swap.h>
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#include <linux/security.h>
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#include <linux/cdev.h>
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2018-10-31 05:09:49 +07:00
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#include <linux/memblock.h>
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2009-05-22 04:01:26 +07:00
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#include <linux/fsnotify.h>
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2006-01-10 11:52:17 +07:00
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#include <linux/mount.h>
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2009-06-09 06:50:45 +07:00
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#include <linux/posix_acl.h>
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2011-05-22 23:54:21 +07:00
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#include <linux/prefetch.h>
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2011-05-27 20:28:01 +07:00
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#include <linux/buffer_head.h> /* for inode_has_buffers */
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2011-11-21 18:11:32 +07:00
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#include <linux/ratelimit.h>
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2013-08-28 07:17:58 +07:00
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#include <linux/list_lru.h>
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2018-01-29 18:41:30 +07:00
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#include <linux/iversion.h>
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2015-02-02 12:37:00 +07:00
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#include <trace/events/writeback.h>
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2011-03-22 18:23:41 +07:00
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#include "internal.h"
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2005-04-17 05:20:36 +07:00
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2011-03-22 18:23:36 +07:00
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/*
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2011-05-27 20:28:01 +07:00
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* Inode locking rules:
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2011-03-22 18:23:36 +07:00
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*
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* inode->i_lock protects:
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* inode->i_state, inode->i_hash, __iget()
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2013-08-28 07:17:58 +07:00
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* Inode LRU list locks protect:
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2011-07-08 11:14:39 +07:00
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* inode->i_sb->s_inode_lru, inode->i_lru
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2015-03-05 00:37:22 +07:00
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* inode->i_sb->s_inode_list_lock protects:
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* inode->i_sb->s_inodes, inode->i_sb_list
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2011-04-22 07:19:44 +07:00
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* bdi->wb.list_lock protects:
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2015-03-05 02:07:22 +07:00
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* bdi->wb.b_{dirty,io,more_io,dirty_time}, inode->i_io_list
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2011-03-22 18:23:42 +07:00
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* inode_hash_lock protects:
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* inode_hashtable, inode->i_hash
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2011-03-22 18:23:36 +07:00
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*
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* Lock ordering:
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2011-03-22 18:23:40 +07:00
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*
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2015-03-05 00:37:22 +07:00
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* inode->i_sb->s_inode_list_lock
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2011-03-22 18:23:40 +07:00
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* inode->i_lock
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2013-08-28 07:17:58 +07:00
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* Inode LRU list locks
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2011-03-22 18:23:41 +07:00
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*
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2011-04-22 07:19:44 +07:00
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* bdi->wb.list_lock
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2011-03-22 18:23:41 +07:00
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* inode->i_lock
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2011-03-22 18:23:42 +07:00
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*
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* inode_hash_lock
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2015-03-05 00:37:22 +07:00
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* inode->i_sb->s_inode_list_lock
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2011-03-22 18:23:42 +07:00
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* inode->i_lock
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*
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* iunique_lock
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* inode_hash_lock
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2011-03-22 18:23:36 +07:00
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*/
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2006-03-26 16:37:24 +07:00
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static unsigned int i_hash_mask __read_mostly;
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static unsigned int i_hash_shift __read_mostly;
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2011-03-22 18:23:42 +07:00
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static struct hlist_head *inode_hashtable __read_mostly;
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static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
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2005-04-17 05:20:36 +07:00
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2011-04-06 04:51:48 +07:00
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/*
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* Empty aops. Can be used for the cases where the user does not
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* define any of the address_space operations.
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*/
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const struct address_space_operations empty_aops = {
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};
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EXPORT_SYMBOL(empty_aops);
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2005-04-17 05:20:36 +07:00
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/*
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* Statistics gathering..
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*/
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struct inodes_stat_t inodes_stat;
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fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
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static DEFINE_PER_CPU(unsigned long, nr_inodes);
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static DEFINE_PER_CPU(unsigned long, nr_unused);
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2010-10-23 16:03:02 +07:00
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2009-03-31 21:05:54 +07:00
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static struct kmem_cache *inode_cachep __read_mostly;
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2005-04-17 05:20:36 +07:00
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fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
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static long get_nr_inodes(void)
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2010-10-23 16:03:02 +07:00
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{
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fs: use fast counters for vfs caches
percpu_counter library generates quite nasty code, so unless you need
to dynamically allocate counters or take fast approximate value, a
simple per cpu set of counters is much better.
The percpu_counter can never be made to work as well, because it has an
indirection from pointer to percpu memory, and it can't use direct
this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
code will always be worse.
In the fastpath, it is the difference between this:
incl %gs:nr_dentry # nr_dentry
and this:
movl percpu_counter_batch(%rip), %edx # percpu_counter_batch,
movl $1, %esi #,
movq $nr_dentry, %rdi #,
call __percpu_counter_add # (plus I clobber registers)
__percpu_counter_add:
pushq %rbp #
movq %rsp, %rbp #,
subq $32, %rsp #,
movq %rbx, -24(%rbp) #,
movq %r12, -16(%rbp) #,
movq %r13, -8(%rbp) #,
movq %rdi, %rbx # fbc, fbc
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
incl -8124(%rax) # <variable>.preempt_count
movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__
#APP
# 78 "lib/percpu_counter.c" 1
add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__
# 0 "" 2
#NO_APP
movslq (%r12),%r13 #* tcp_ptr__, tmp73
movslq %edx,%rax # batch, batch
addq %rsi, %r13 # amount, count
cmpq %rax, %r13 # batch, count
jge .L27 #,
negl %edx # tmp76
movslq %edx,%rdx # tmp76, tmp77
cmpq %rdx, %r13 # tmp77, count
jg .L28 #,
.L27:
movq %rbx, %rdi # fbc,
call _raw_spin_lock #
addq %r13, 8(%rbx) # count, <variable>.count
movq %rbx, %rdi # fbc,
movl $0, (%r12) #,* tcp_ptr__
call _raw_spin_unlock #
.L29:
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
decl -8124(%rax) # <variable>.preempt_count
movq -8136(%rax), %rax #, D.14625
testb $8, %al #, D.14625
jne .L32 #,
.L31:
movq -24(%rbp), %rbx #,
movq -16(%rbp), %r12 #,
movq -8(%rbp), %r13 #,
leave
ret
.p2align 4,,10
.p2align 3
.L28:
movl %r13d, (%r12) # count,*
jmp .L29 #
.L32:
call preempt_schedule #
.p2align 4,,6
jmp .L31 #
.size __percpu_counter_add, .-__percpu_counter_add
.p2align 4,,15
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 13:49:19 +07:00
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int i;
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fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
long sum = 0;
|
fs: use fast counters for vfs caches
percpu_counter library generates quite nasty code, so unless you need
to dynamically allocate counters or take fast approximate value, a
simple per cpu set of counters is much better.
The percpu_counter can never be made to work as well, because it has an
indirection from pointer to percpu memory, and it can't use direct
this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
code will always be worse.
In the fastpath, it is the difference between this:
incl %gs:nr_dentry # nr_dentry
and this:
movl percpu_counter_batch(%rip), %edx # percpu_counter_batch,
movl $1, %esi #,
movq $nr_dentry, %rdi #,
call __percpu_counter_add # (plus I clobber registers)
__percpu_counter_add:
pushq %rbp #
movq %rsp, %rbp #,
subq $32, %rsp #,
movq %rbx, -24(%rbp) #,
movq %r12, -16(%rbp) #,
movq %r13, -8(%rbp) #,
movq %rdi, %rbx # fbc, fbc
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
incl -8124(%rax) # <variable>.preempt_count
movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__
#APP
# 78 "lib/percpu_counter.c" 1
add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__
# 0 "" 2
#NO_APP
movslq (%r12),%r13 #* tcp_ptr__, tmp73
movslq %edx,%rax # batch, batch
addq %rsi, %r13 # amount, count
cmpq %rax, %r13 # batch, count
jge .L27 #,
negl %edx # tmp76
movslq %edx,%rdx # tmp76, tmp77
cmpq %rdx, %r13 # tmp77, count
jg .L28 #,
.L27:
movq %rbx, %rdi # fbc,
call _raw_spin_lock #
addq %r13, 8(%rbx) # count, <variable>.count
movq %rbx, %rdi # fbc,
movl $0, (%r12) #,* tcp_ptr__
call _raw_spin_unlock #
.L29:
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
decl -8124(%rax) # <variable>.preempt_count
movq -8136(%rax), %rax #, D.14625
testb $8, %al #, D.14625
jne .L32 #,
.L31:
movq -24(%rbp), %rbx #,
movq -16(%rbp), %r12 #,
movq -8(%rbp), %r13 #,
leave
ret
.p2align 4,,10
.p2align 3
.L28:
movl %r13d, (%r12) # count,*
jmp .L29 #
.L32:
call preempt_schedule #
.p2align 4,,6
jmp .L31 #
.size __percpu_counter_add, .-__percpu_counter_add
.p2align 4,,15
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 13:49:19 +07:00
|
|
|
for_each_possible_cpu(i)
|
|
|
|
sum += per_cpu(nr_inodes, i);
|
|
|
|
return sum < 0 ? 0 : sum;
|
2010-10-23 16:03:02 +07:00
|
|
|
}
|
|
|
|
|
fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
static inline long get_nr_inodes_unused(void)
|
2010-10-23 16:03:02 +07:00
|
|
|
{
|
2011-07-08 11:14:38 +07:00
|
|
|
int i;
|
fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
long sum = 0;
|
2011-07-08 11:14:38 +07:00
|
|
|
for_each_possible_cpu(i)
|
|
|
|
sum += per_cpu(nr_unused, i);
|
|
|
|
return sum < 0 ? 0 : sum;
|
2010-10-23 16:03:02 +07:00
|
|
|
}
|
|
|
|
|
fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
long get_nr_dirty_inodes(void)
|
2010-10-23 16:03:02 +07:00
|
|
|
{
|
fs: use fast counters for vfs caches
percpu_counter library generates quite nasty code, so unless you need
to dynamically allocate counters or take fast approximate value, a
simple per cpu set of counters is much better.
The percpu_counter can never be made to work as well, because it has an
indirection from pointer to percpu memory, and it can't use direct
this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
code will always be worse.
In the fastpath, it is the difference between this:
incl %gs:nr_dentry # nr_dentry
and this:
movl percpu_counter_batch(%rip), %edx # percpu_counter_batch,
movl $1, %esi #,
movq $nr_dentry, %rdi #,
call __percpu_counter_add # (plus I clobber registers)
__percpu_counter_add:
pushq %rbp #
movq %rsp, %rbp #,
subq $32, %rsp #,
movq %rbx, -24(%rbp) #,
movq %r12, -16(%rbp) #,
movq %r13, -8(%rbp) #,
movq %rdi, %rbx # fbc, fbc
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
incl -8124(%rax) # <variable>.preempt_count
movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__
#APP
# 78 "lib/percpu_counter.c" 1
add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__
# 0 "" 2
#NO_APP
movslq (%r12),%r13 #* tcp_ptr__, tmp73
movslq %edx,%rax # batch, batch
addq %rsi, %r13 # amount, count
cmpq %rax, %r13 # batch, count
jge .L27 #,
negl %edx # tmp76
movslq %edx,%rdx # tmp76, tmp77
cmpq %rdx, %r13 # tmp77, count
jg .L28 #,
.L27:
movq %rbx, %rdi # fbc,
call _raw_spin_lock #
addq %r13, 8(%rbx) # count, <variable>.count
movq %rbx, %rdi # fbc,
movl $0, (%r12) #,* tcp_ptr__
call _raw_spin_unlock #
.L29:
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
decl -8124(%rax) # <variable>.preempt_count
movq -8136(%rax), %rax #, D.14625
testb $8, %al #, D.14625
jne .L32 #,
.L31:
movq -24(%rbp), %rbx #,
movq -16(%rbp), %r12 #,
movq -8(%rbp), %r13 #,
leave
ret
.p2align 4,,10
.p2align 3
.L28:
movl %r13d, (%r12) # count,*
jmp .L29 #
.L32:
call preempt_schedule #
.p2align 4,,6
jmp .L31 #
.size __percpu_counter_add, .-__percpu_counter_add
.p2align 4,,15
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 13:49:19 +07:00
|
|
|
/* not actually dirty inodes, but a wild approximation */
|
fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
long nr_dirty = get_nr_inodes() - get_nr_inodes_unused();
|
2010-10-23 16:03:02 +07:00
|
|
|
return nr_dirty > 0 ? nr_dirty : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle nr_inode sysctl
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_SYSCTL
|
2014-06-07 04:38:05 +07:00
|
|
|
int proc_nr_inodes(struct ctl_table *table, int write,
|
2010-10-23 16:03:02 +07:00
|
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
|
|
{
|
|
|
|
inodes_stat.nr_inodes = get_nr_inodes();
|
2011-07-08 11:14:38 +07:00
|
|
|
inodes_stat.nr_unused = get_nr_inodes_unused();
|
fs: bump inode and dentry counters to long
This series reworks our current object cache shrinking infrastructure in
two main ways:
* Noticing that a lot of users copy and paste their own version of LRU
lists for objects, we put some effort in providing a generic version.
It is modeled after the filesystem users: dentries, inodes, and xfs
(for various tasks), but we expect that other users could benefit in
the near future with little or no modification. Let us know if you
have any issues.
* The underlying list_lru being proposed automatically and
transparently keeps the elements in per-node lists, and is able to
manipulate the node lists individually. Given this infrastructure, we
are able to modify the up-to-now hammer called shrink_slab to proceed
with node-reclaim instead of always searching memory from all over like
it has been doing.
Per-node lru lists are also expected to lead to less contention in the lru
locks on multi-node scans, since we are now no longer fighting for a
global lock. The locks usually disappear from the profilers with this
change.
Although we have no official benchmarks for this version - be our guest to
independently evaluate this - earlier versions of this series were
performance tested (details at
http://permalink.gmane.org/gmane.linux.kernel.mm/100537) yielding no
visible performance regressions while yielding a better qualitative
behavior in NUMA machines.
With this infrastructure in place, we can use the list_lru entry point to
provide memcg isolation and per-memcg targeted reclaim. Historically,
those two pieces of work have been posted together. This version presents
only the infrastructure work, deferring the memcg work for a later time,
so we can focus on getting this part tested. You can see more about the
history of such work at http://lwn.net/Articles/552769/
Dave Chinner (18):
dcache: convert dentry_stat.nr_unused to per-cpu counters
dentry: move to per-sb LRU locks
dcache: remove dentries from LRU before putting on dispose list
mm: new shrinker API
shrinker: convert superblock shrinkers to new API
list: add a new LRU list type
inode: convert inode lru list to generic lru list code.
dcache: convert to use new lru list infrastructure
list_lru: per-node list infrastructure
shrinker: add node awareness
fs: convert inode and dentry shrinking to be node aware
xfs: convert buftarg LRU to generic code
xfs: rework buffer dispose list tracking
xfs: convert dquot cache lru to list_lru
fs: convert fs shrinkers to new scan/count API
drivers: convert shrinkers to new count/scan API
shrinker: convert remaining shrinkers to count/scan API
shrinker: Kill old ->shrink API.
Glauber Costa (7):
fs: bump inode and dentry counters to long
super: fix calculation of shrinkable objects for small numbers
list_lru: per-node API
vmscan: per-node deferred work
i915: bail out earlier when shrinker cannot acquire mutex
hugepage: convert huge zero page shrinker to new shrinker API
list_lru: dynamically adjust node arrays
This patch:
There are situations in very large machines in which we can have a large
quantity of dirty inodes, unused dentries, etc. This is particularly true
when umounting a filesystem, where eventually since every live object will
eventually be discarded.
Dave Chinner reported a problem with this while experimenting with the
shrinker revamp patchset. So we believe it is time for a change. This
patch just moves int to longs. Machines where it matters should have a
big long anyway.
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-28 07:17:53 +07:00
|
|
|
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
|
2010-10-23 16:03:02 +07:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2014-11-19 11:38:21 +07:00
|
|
|
static int no_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
2008-10-30 13:32:23 +07:00
|
|
|
/**
|
2017-05-09 05:57:53 +07:00
|
|
|
* inode_init_always - perform inode structure initialisation
|
2009-01-07 05:41:13 +07:00
|
|
|
* @sb: superblock inode belongs to
|
|
|
|
* @inode: inode to initialise
|
2008-10-30 13:32:23 +07:00
|
|
|
*
|
|
|
|
* These are initializations that need to be done on every inode
|
|
|
|
* allocation as the fields are not initialised by slab allocation.
|
|
|
|
*/
|
2009-08-08 00:38:25 +07:00
|
|
|
int inode_init_always(struct super_block *sb, struct inode *inode)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2009-09-22 07:01:11 +07:00
|
|
|
static const struct inode_operations empty_iops;
|
2014-11-19 11:38:21 +07:00
|
|
|
static const struct file_operations no_open_fops = {.open = no_open};
|
2009-03-31 21:05:54 +07:00
|
|
|
struct address_space *const mapping = &inode->i_data;
|
2008-10-30 13:32:23 +07:00
|
|
|
|
|
|
|
inode->i_sb = sb;
|
|
|
|
inode->i_blkbits = sb->s_blocksize_bits;
|
|
|
|
inode->i_flags = 0;
|
|
|
|
atomic_set(&inode->i_count, 1);
|
|
|
|
inode->i_op = &empty_iops;
|
2014-11-19 11:38:21 +07:00
|
|
|
inode->i_fop = &no_open_fops;
|
2011-10-28 19:13:30 +07:00
|
|
|
inode->__i_nlink = 1;
|
2011-08-07 12:45:50 +07:00
|
|
|
inode->i_opflags = 0;
|
2016-09-29 22:48:39 +07:00
|
|
|
if (sb->s_xattr)
|
|
|
|
inode->i_opflags |= IOP_XATTR;
|
2012-02-08 22:07:50 +07:00
|
|
|
i_uid_write(inode, 0);
|
|
|
|
i_gid_write(inode, 0);
|
2008-10-30 13:32:23 +07:00
|
|
|
atomic_set(&inode->i_writecount, 0);
|
|
|
|
inode->i_size = 0;
|
fs: add fcntl() interface for setting/getting write life time hints
Define a set of write life time hints:
RWH_WRITE_LIFE_NOT_SET No hint information set
RWH_WRITE_LIFE_NONE No hints about write life time
RWH_WRITE_LIFE_SHORT Data written has a short life time
RWH_WRITE_LIFE_MEDIUM Data written has a medium life time
RWH_WRITE_LIFE_LONG Data written has a long life time
RWH_WRITE_LIFE_EXTREME Data written has an extremely long life time
The intent is for these values to be relative to each other, no
absolute meaning should be attached to these flag names.
Add an fcntl interface for querying these flags, and also for
setting them as well:
F_GET_RW_HINT Returns the read/write hint set on the
underlying inode.
F_SET_RW_HINT Set one of the above write hints on the
underlying inode.
F_GET_FILE_RW_HINT Returns the read/write hint set on the
file descriptor.
F_SET_FILE_RW_HINT Set one of the above write hints on the
file descriptor.
The user passes in a 64-bit pointer to get/set these values, and
the interface returns 0/-1 on success/error.
Sample program testing/implementing basic setting/getting of write
hints is below.
Add support for storing the write life time hint in the inode flags
and in struct file as well, and pass them to the kiocb flags. If
both a file and its corresponding inode has a write hint, then we
use the one in the file, if available. The file hint can be used
for sync/direct IO, for buffered writeback only the inode hint
is available.
This is in preparation for utilizing these hints in the block layer,
to guide on-media data placement.
/*
* writehint.c: get or set an inode write hint
*/
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <inttypes.h>
#ifndef F_GET_RW_HINT
#define F_LINUX_SPECIFIC_BASE 1024
#define F_GET_RW_HINT (F_LINUX_SPECIFIC_BASE + 11)
#define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12)
#endif
static char *str[] = { "RWF_WRITE_LIFE_NOT_SET", "RWH_WRITE_LIFE_NONE",
"RWH_WRITE_LIFE_SHORT", "RWH_WRITE_LIFE_MEDIUM",
"RWH_WRITE_LIFE_LONG", "RWH_WRITE_LIFE_EXTREME" };
int main(int argc, char *argv[])
{
uint64_t hint;
int fd, ret;
if (argc < 2) {
fprintf(stderr, "%s: file <hint>\n", argv[0]);
return 1;
}
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("open");
return 2;
}
if (argc > 2) {
hint = atoi(argv[2]);
ret = fcntl(fd, F_SET_RW_HINT, &hint);
if (ret < 0) {
perror("fcntl: F_SET_RW_HINT");
return 4;
}
}
ret = fcntl(fd, F_GET_RW_HINT, &hint);
if (ret < 0) {
perror("fcntl: F_GET_RW_HINT");
return 3;
}
printf("%s: hint %s\n", argv[1], str[hint]);
close(fd);
return 0;
}
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-06-28 00:47:04 +07:00
|
|
|
inode->i_write_hint = WRITE_LIFE_NOT_SET;
|
2008-10-30 13:32:23 +07:00
|
|
|
inode->i_blocks = 0;
|
|
|
|
inode->i_bytes = 0;
|
|
|
|
inode->i_generation = 0;
|
|
|
|
inode->i_pipe = NULL;
|
|
|
|
inode->i_bdev = NULL;
|
|
|
|
inode->i_cdev = NULL;
|
2015-05-02 20:54:06 +07:00
|
|
|
inode->i_link = NULL;
|
parallel lookups machinery, part 2
We'll need to verify that there's neither a hashed nor in-lookup
dentry with desired parent/name before adding to in-lookup set.
One possible solution would be to hold the parent's ->d_lock through
both checks, but while the in-lookup set is relatively small at any
time, dcache is not. And holding the parent's ->d_lock through
something like __d_lookup_rcu() would suck too badly.
So we leave the parent's ->d_lock alone, which means that we watch
out for the following scenario:
* we verify that there's no hashed match
* existing in-lookup match gets hashed by another process
* we verify that there's no in-lookup matches and decide
that everything's fine.
Solution: per-directory kinda-sorta seqlock, bumped around the times
we hash something that used to be in-lookup or move (and hash)
something in place of in-lookup. Then the above would turn into
* read the counter
* do dcache lookup
* if no matches found, check for in-lookup matches
* if there had been none of those either, check if the
counter has changed; repeat if it has.
The "kinda-sorta" part is due to the fact that we don't have much spare
space in inode. There is a spare word (shared with i_bdev/i_cdev/i_pipe),
so the counter part is not a problem, but spinlock is a different story.
We could use the parent's ->d_lock, and it would be less painful in
terms of contention, for __d_add() it would be rather inconvenient to
grab; we could do that (using lock_parent()), but...
Fortunately, we can get serialization on the counter itself, and it
might be a good idea in general; we can use cmpxchg() in a loop to
get from even to odd and smp_store_release() from odd to even.
This commit adds the counter and updating logics; the readers will be
added in the next commit.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-04-15 11:58:55 +07:00
|
|
|
inode->i_dir_seq = 0;
|
2008-10-30 13:32:23 +07:00
|
|
|
inode->i_rdev = 0;
|
|
|
|
inode->dirtied_when = 0;
|
2009-02-04 21:06:57 +07:00
|
|
|
|
2016-02-17 04:34:39 +07:00
|
|
|
#ifdef CONFIG_CGROUP_WRITEBACK
|
|
|
|
inode->i_wb_frn_winner = 0;
|
|
|
|
inode->i_wb_frn_avg_time = 0;
|
|
|
|
inode->i_wb_frn_history = 0;
|
|
|
|
#endif
|
|
|
|
|
2009-02-04 21:06:57 +07:00
|
|
|
if (security_inode_alloc(inode))
|
2009-08-08 00:38:25 +07:00
|
|
|
goto out;
|
2008-10-30 13:32:23 +07:00
|
|
|
spin_lock_init(&inode->i_lock);
|
|
|
|
lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key);
|
|
|
|
|
2016-04-16 02:08:36 +07:00
|
|
|
init_rwsem(&inode->i_rwsem);
|
|
|
|
lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key);
|
2008-10-30 13:32:23 +07:00
|
|
|
|
2011-06-25 01:29:43 +07:00
|
|
|
atomic_set(&inode->i_dio_count, 0);
|
2008-10-30 13:32:23 +07:00
|
|
|
|
|
|
|
mapping->a_ops = &empty_aops;
|
|
|
|
mapping->host = inode;
|
|
|
|
mapping->flags = 0;
|
2018-05-31 09:43:53 +07:00
|
|
|
mapping->wb_err = 0;
|
2014-08-09 04:25:25 +07:00
|
|
|
atomic_set(&mapping->i_mmap_writable, 0);
|
2009-01-07 05:39:23 +07:00
|
|
|
mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);
|
2012-12-12 07:02:35 +07:00
|
|
|
mapping->private_data = NULL;
|
2008-10-30 13:32:23 +07:00
|
|
|
mapping->writeback_index = 0;
|
|
|
|
inode->i_private = NULL;
|
|
|
|
inode->i_mapping = mapping;
|
2012-06-10 00:51:19 +07:00
|
|
|
INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */
|
2009-06-09 06:50:45 +07:00
|
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
|
|
|
inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
|
|
|
|
#endif
|
2008-10-30 13:32:23 +07:00
|
|
|
|
2009-05-22 04:01:26 +07:00
|
|
|
#ifdef CONFIG_FSNOTIFY
|
|
|
|
inode->i_fsnotify_mask = 0;
|
|
|
|
#endif
|
2015-01-17 03:05:54 +07:00
|
|
|
inode->i_flctx = NULL;
|
fs: use fast counters for vfs caches
percpu_counter library generates quite nasty code, so unless you need
to dynamically allocate counters or take fast approximate value, a
simple per cpu set of counters is much better.
The percpu_counter can never be made to work as well, because it has an
indirection from pointer to percpu memory, and it can't use direct
this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
code will always be worse.
In the fastpath, it is the difference between this:
incl %gs:nr_dentry # nr_dentry
and this:
movl percpu_counter_batch(%rip), %edx # percpu_counter_batch,
movl $1, %esi #,
movq $nr_dentry, %rdi #,
call __percpu_counter_add # (plus I clobber registers)
__percpu_counter_add:
pushq %rbp #
movq %rsp, %rbp #,
subq $32, %rsp #,
movq %rbx, -24(%rbp) #,
movq %r12, -16(%rbp) #,
movq %r13, -8(%rbp) #,
movq %rdi, %rbx # fbc, fbc
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
incl -8124(%rax) # <variable>.preempt_count
movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__
#APP
# 78 "lib/percpu_counter.c" 1
add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__
# 0 "" 2
#NO_APP
movslq (%r12),%r13 #* tcp_ptr__, tmp73
movslq %edx,%rax # batch, batch
addq %rsi, %r13 # amount, count
cmpq %rax, %r13 # batch, count
jge .L27 #,
negl %edx # tmp76
movslq %edx,%rdx # tmp76, tmp77
cmpq %rdx, %r13 # tmp77, count
jg .L28 #,
.L27:
movq %rbx, %rdi # fbc,
call _raw_spin_lock #
addq %r13, 8(%rbx) # count, <variable>.count
movq %rbx, %rdi # fbc,
movl $0, (%r12) #,* tcp_ptr__
call _raw_spin_unlock #
.L29:
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
decl -8124(%rax) # <variable>.preempt_count
movq -8136(%rax), %rax #, D.14625
testb $8, %al #, D.14625
jne .L32 #,
.L31:
movq -24(%rbp), %rbx #,
movq -16(%rbp), %r12 #,
movq -8(%rbp), %r13 #,
leave
ret
.p2align 4,,10
.p2align 3
.L28:
movl %r13d, (%r12) # count,*
jmp .L29 #
.L32:
call preempt_schedule #
.p2align 4,,6
jmp .L31 #
.size __percpu_counter_add, .-__percpu_counter_add
.p2align 4,,15
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 13:49:19 +07:00
|
|
|
this_cpu_inc(nr_inodes);
|
2010-10-23 16:03:02 +07:00
|
|
|
|
2009-08-08 00:38:25 +07:00
|
|
|
return 0;
|
|
|
|
out:
|
|
|
|
return -ENOMEM;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2008-10-30 13:32:23 +07:00
|
|
|
EXPORT_SYMBOL(inode_init_always);
|
|
|
|
|
2019-04-11 01:43:44 +07:00
|
|
|
void free_inode_nonrcu(struct inode *inode)
|
|
|
|
{
|
|
|
|
kmem_cache_free(inode_cachep, inode);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(free_inode_nonrcu);
|
|
|
|
|
|
|
|
static void i_callback(struct rcu_head *head)
|
|
|
|
{
|
|
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
|
|
if (inode->free_inode)
|
|
|
|
inode->free_inode(inode);
|
|
|
|
else
|
|
|
|
free_inode_nonrcu(inode);
|
|
|
|
}
|
|
|
|
|
2008-10-30 13:32:23 +07:00
|
|
|
static struct inode *alloc_inode(struct super_block *sb)
|
|
|
|
{
|
2019-04-11 01:43:44 +07:00
|
|
|
const struct super_operations *ops = sb->s_op;
|
2008-10-30 13:32:23 +07:00
|
|
|
struct inode *inode;
|
|
|
|
|
2019-04-11 01:43:44 +07:00
|
|
|
if (ops->alloc_inode)
|
|
|
|
inode = ops->alloc_inode(sb);
|
2008-10-30 13:32:23 +07:00
|
|
|
else
|
|
|
|
inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL);
|
|
|
|
|
2009-08-08 00:38:25 +07:00
|
|
|
if (!inode)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (unlikely(inode_init_always(sb, inode))) {
|
2019-04-11 01:43:44 +07:00
|
|
|
if (ops->destroy_inode) {
|
|
|
|
ops->destroy_inode(inode);
|
|
|
|
if (!ops->free_inode)
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
inode->free_inode = ops->free_inode;
|
|
|
|
i_callback(&inode->i_rcu);
|
2009-08-08 00:38:25 +07:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return inode;
|
2008-10-30 13:32:23 +07:00
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2009-08-08 00:38:29 +07:00
|
|
|
void __destroy_inode(struct inode *inode)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2006-04-02 18:38:18 +07:00
|
|
|
BUG_ON(inode_has_buffers(inode));
|
2015-05-23 04:13:37 +07:00
|
|
|
inode_detach_wb(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
security_inode_free(inode);
|
2009-05-22 04:01:26 +07:00
|
|
|
fsnotify_inode_delete(inode);
|
2016-01-08 03:08:51 +07:00
|
|
|
locks_free_lock_context(inode);
|
2011-11-21 18:11:32 +07:00
|
|
|
if (!inode->i_nlink) {
|
|
|
|
WARN_ON(atomic_long_read(&inode->i_sb->s_remove_count) == 0);
|
|
|
|
atomic_long_dec(&inode->i_sb->s_remove_count);
|
|
|
|
}
|
|
|
|
|
2009-06-09 06:50:45 +07:00
|
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
2016-03-24 20:38:37 +07:00
|
|
|
if (inode->i_acl && !is_uncached_acl(inode->i_acl))
|
2009-06-09 06:50:45 +07:00
|
|
|
posix_acl_release(inode->i_acl);
|
2016-03-24 20:38:37 +07:00
|
|
|
if (inode->i_default_acl && !is_uncached_acl(inode->i_default_acl))
|
2009-06-09 06:50:45 +07:00
|
|
|
posix_acl_release(inode->i_default_acl);
|
|
|
|
#endif
|
fs: use fast counters for vfs caches
percpu_counter library generates quite nasty code, so unless you need
to dynamically allocate counters or take fast approximate value, a
simple per cpu set of counters is much better.
The percpu_counter can never be made to work as well, because it has an
indirection from pointer to percpu memory, and it can't use direct
this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
code will always be worse.
In the fastpath, it is the difference between this:
incl %gs:nr_dentry # nr_dentry
and this:
movl percpu_counter_batch(%rip), %edx # percpu_counter_batch,
movl $1, %esi #,
movq $nr_dentry, %rdi #,
call __percpu_counter_add # (plus I clobber registers)
__percpu_counter_add:
pushq %rbp #
movq %rsp, %rbp #,
subq $32, %rsp #,
movq %rbx, -24(%rbp) #,
movq %r12, -16(%rbp) #,
movq %r13, -8(%rbp) #,
movq %rdi, %rbx # fbc, fbc
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
incl -8124(%rax) # <variable>.preempt_count
movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__
#APP
# 78 "lib/percpu_counter.c" 1
add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__
# 0 "" 2
#NO_APP
movslq (%r12),%r13 #* tcp_ptr__, tmp73
movslq %edx,%rax # batch, batch
addq %rsi, %r13 # amount, count
cmpq %rax, %r13 # batch, count
jge .L27 #,
negl %edx # tmp76
movslq %edx,%rdx # tmp76, tmp77
cmpq %rdx, %r13 # tmp77, count
jg .L28 #,
.L27:
movq %rbx, %rdi # fbc,
call _raw_spin_lock #
addq %r13, 8(%rbx) # count, <variable>.count
movq %rbx, %rdi # fbc,
movl $0, (%r12) #,* tcp_ptr__
call _raw_spin_unlock #
.L29:
#APP
# 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
movq %gs:kernel_stack,%rax #, pfo_ret__
# 0 "" 2
#NO_APP
decl -8124(%rax) # <variable>.preempt_count
movq -8136(%rax), %rax #, D.14625
testb $8, %al #, D.14625
jne .L32 #,
.L31:
movq -24(%rbp), %rbx #,
movq -16(%rbp), %r12 #,
movq -8(%rbp), %r13 #,
leave
ret
.p2align 4,,10
.p2align 3
.L28:
movl %r13d, (%r12) # count,*
jmp .L29 #
.L32:
call preempt_schedule #
.p2align 4,,6
jmp .L31 #
.size __percpu_counter_add, .-__percpu_counter_add
.p2align 4,,15
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 13:49:19 +07:00
|
|
|
this_cpu_dec(nr_inodes);
|
2009-08-08 00:38:29 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__destroy_inode);
|
|
|
|
|
2010-10-06 15:48:55 +07:00
|
|
|
static void destroy_inode(struct inode *inode)
|
2009-08-08 00:38:29 +07:00
|
|
|
{
|
2019-04-11 01:43:44 +07:00
|
|
|
const struct super_operations *ops = inode->i_sb->s_op;
|
|
|
|
|
2010-10-21 07:49:30 +07:00
|
|
|
BUG_ON(!list_empty(&inode->i_lru));
|
2009-08-08 00:38:29 +07:00
|
|
|
__destroy_inode(inode);
|
2019-04-11 01:43:44 +07:00
|
|
|
if (ops->destroy_inode) {
|
|
|
|
ops->destroy_inode(inode);
|
|
|
|
if (!ops->free_inode)
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
inode->free_inode = ops->free_inode;
|
|
|
|
call_rcu(&inode->i_rcu, i_callback);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
2011-11-21 18:11:32 +07:00
|
|
|
/**
|
|
|
|
* drop_nlink - directly drop an inode's link count
|
|
|
|
* @inode: inode
|
|
|
|
*
|
|
|
|
* This is a low-level filesystem helper to replace any
|
|
|
|
* direct filesystem manipulation of i_nlink. In cases
|
|
|
|
* where we are attempting to track writes to the
|
|
|
|
* filesystem, a decrement to zero means an imminent
|
|
|
|
* write when the file is truncated and actually unlinked
|
|
|
|
* on the filesystem.
|
|
|
|
*/
|
|
|
|
void drop_nlink(struct inode *inode)
|
|
|
|
{
|
|
|
|
WARN_ON(inode->i_nlink == 0);
|
|
|
|
inode->__i_nlink--;
|
|
|
|
if (!inode->i_nlink)
|
|
|
|
atomic_long_inc(&inode->i_sb->s_remove_count);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drop_nlink);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* clear_nlink - directly zero an inode's link count
|
|
|
|
* @inode: inode
|
|
|
|
*
|
|
|
|
* This is a low-level filesystem helper to replace any
|
|
|
|
* direct filesystem manipulation of i_nlink. See
|
|
|
|
* drop_nlink() for why we care about i_nlink hitting zero.
|
|
|
|
*/
|
|
|
|
void clear_nlink(struct inode *inode)
|
|
|
|
{
|
|
|
|
if (inode->i_nlink) {
|
|
|
|
inode->__i_nlink = 0;
|
|
|
|
atomic_long_inc(&inode->i_sb->s_remove_count);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(clear_nlink);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* set_nlink - directly set an inode's link count
|
|
|
|
* @inode: inode
|
|
|
|
* @nlink: new nlink (should be non-zero)
|
|
|
|
*
|
|
|
|
* This is a low-level filesystem helper to replace any
|
|
|
|
* direct filesystem manipulation of i_nlink.
|
|
|
|
*/
|
|
|
|
void set_nlink(struct inode *inode, unsigned int nlink)
|
|
|
|
{
|
|
|
|
if (!nlink) {
|
|
|
|
clear_nlink(inode);
|
|
|
|
} else {
|
|
|
|
/* Yes, some filesystems do change nlink from zero to one */
|
|
|
|
if (inode->i_nlink == 0)
|
|
|
|
atomic_long_dec(&inode->i_sb->s_remove_count);
|
|
|
|
|
|
|
|
inode->__i_nlink = nlink;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(set_nlink);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* inc_nlink - directly increment an inode's link count
|
|
|
|
* @inode: inode
|
|
|
|
*
|
|
|
|
* This is a low-level filesystem helper to replace any
|
|
|
|
* direct filesystem manipulation of i_nlink. Currently,
|
|
|
|
* it is only here for parity with dec_nlink().
|
|
|
|
*/
|
|
|
|
void inc_nlink(struct inode *inode)
|
|
|
|
{
|
2013-06-11 11:34:36 +07:00
|
|
|
if (unlikely(inode->i_nlink == 0)) {
|
|
|
|
WARN_ON(!(inode->i_state & I_LINKABLE));
|
2011-11-21 18:11:32 +07:00
|
|
|
atomic_long_dec(&inode->i_sb->s_remove_count);
|
2013-06-11 11:34:36 +07:00
|
|
|
}
|
2011-11-21 18:11:32 +07:00
|
|
|
|
|
|
|
inode->__i_nlink++;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inc_nlink);
|
|
|
|
|
2018-03-07 08:30:34 +07:00
|
|
|
static void __address_space_init_once(struct address_space *mapping)
|
2011-02-23 19:49:47 +07:00
|
|
|
{
|
2017-12-06 07:04:20 +07:00
|
|
|
xa_init_flags(&mapping->i_pages, XA_FLAGS_LOCK_IRQ);
|
2014-12-13 07:54:24 +07:00
|
|
|
init_rwsem(&mapping->i_mmap_rwsem);
|
2011-02-23 19:49:47 +07:00
|
|
|
INIT_LIST_HEAD(&mapping->private_list);
|
|
|
|
spin_lock_init(&mapping->private_lock);
|
2017-09-09 06:15:08 +07:00
|
|
|
mapping->i_mmap = RB_ROOT_CACHED;
|
2011-02-23 19:49:47 +07:00
|
|
|
}
|
2018-03-07 08:30:34 +07:00
|
|
|
|
|
|
|
void address_space_init_once(struct address_space *mapping)
|
|
|
|
{
|
|
|
|
memset(mapping, 0, sizeof(*mapping));
|
|
|
|
__address_space_init_once(mapping);
|
|
|
|
}
|
2011-02-23 19:49:47 +07:00
|
|
|
EXPORT_SYMBOL(address_space_init_once);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* These are initializations that only need to be done
|
|
|
|
* once, because the fields are idempotent across use
|
|
|
|
* of the inode, so let the slab aware of that.
|
|
|
|
*/
|
|
|
|
void inode_init_once(struct inode *inode)
|
|
|
|
{
|
|
|
|
memset(inode, 0, sizeof(*inode));
|
|
|
|
INIT_HLIST_NODE(&inode->i_hash);
|
|
|
|
INIT_LIST_HEAD(&inode->i_devices);
|
2015-03-05 02:07:22 +07:00
|
|
|
INIT_LIST_HEAD(&inode->i_io_list);
|
2016-07-27 05:21:50 +07:00
|
|
|
INIT_LIST_HEAD(&inode->i_wb_list);
|
2010-10-21 07:49:30 +07:00
|
|
|
INIT_LIST_HEAD(&inode->i_lru);
|
2018-03-07 08:30:34 +07:00
|
|
|
__address_space_init_once(&inode->i_data);
|
2005-04-17 05:20:36 +07:00
|
|
|
i_size_ordered_init(inode);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_init_once);
|
|
|
|
|
2008-07-26 09:45:34 +07:00
|
|
|
static void init_once(void *foo)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *inode = (struct inode *) foo;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2007-05-17 12:10:57 +07:00
|
|
|
inode_init_once(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2011-03-22 18:23:36 +07:00
|
|
|
* inode->i_lock must be held
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2009-03-31 21:05:54 +07:00
|
|
|
void __iget(struct inode *inode)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2010-10-23 17:55:17 +07:00
|
|
|
atomic_inc(&inode->i_count);
|
|
|
|
}
|
2010-05-14 16:49:22 +07:00
|
|
|
|
2010-10-23 22:11:40 +07:00
|
|
|
/*
|
|
|
|
* get additional reference to inode; caller must already hold one.
|
|
|
|
*/
|
|
|
|
void ihold(struct inode *inode)
|
|
|
|
{
|
|
|
|
WARN_ON(atomic_inc_return(&inode->i_count) < 2);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(ihold);
|
|
|
|
|
2010-10-23 17:55:17 +07:00
|
|
|
static void inode_lru_list_add(struct inode *inode)
|
|
|
|
{
|
2013-08-28 07:17:58 +07:00
|
|
|
if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru))
|
2011-07-08 11:14:38 +07:00
|
|
|
this_cpu_inc(nr_unused);
|
2017-04-19 03:04:17 +07:00
|
|
|
else
|
|
|
|
inode->i_state |= I_REFERENCED;
|
2010-10-23 17:55:17 +07:00
|
|
|
}
|
2010-05-14 16:49:22 +07:00
|
|
|
|
2012-11-27 07:29:51 +07:00
|
|
|
/*
|
|
|
|
* Add inode to LRU if needed (inode is unused and clean).
|
|
|
|
*
|
|
|
|
* Needs inode->i_lock held.
|
|
|
|
*/
|
|
|
|
void inode_add_lru(struct inode *inode)
|
|
|
|
{
|
2015-02-02 12:37:00 +07:00
|
|
|
if (!(inode->i_state & (I_DIRTY_ALL | I_SYNC |
|
|
|
|
I_FREEING | I_WILL_FREE)) &&
|
2017-11-28 04:05:09 +07:00
|
|
|
!atomic_read(&inode->i_count) && inode->i_sb->s_flags & SB_ACTIVE)
|
2012-11-27 07:29:51 +07:00
|
|
|
inode_lru_list_add(inode);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-10-23 17:55:17 +07:00
|
|
|
static void inode_lru_list_del(struct inode *inode)
|
|
|
|
{
|
2013-08-28 07:17:58 +07:00
|
|
|
|
|
|
|
if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru))
|
2011-07-08 11:14:38 +07:00
|
|
|
this_cpu_dec(nr_unused);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
2010-10-23 18:15:32 +07:00
|
|
|
/**
|
|
|
|
* inode_sb_list_add - add inode to the superblock list of inodes
|
|
|
|
* @inode: inode to add
|
|
|
|
*/
|
|
|
|
void inode_sb_list_add(struct inode *inode)
|
|
|
|
{
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_lock(&inode->i_sb->s_inode_list_lock);
|
2011-03-22 18:23:40 +07:00
|
|
|
list_add(&inode->i_sb_list, &inode->i_sb->s_inodes);
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_unlock(&inode->i_sb->s_inode_list_lock);
|
2010-10-23 18:15:32 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inode_sb_list_add);
|
|
|
|
|
2011-03-22 18:23:40 +07:00
|
|
|
static inline void inode_sb_list_del(struct inode *inode)
|
2010-10-23 18:15:32 +07:00
|
|
|
{
|
2011-07-26 16:36:34 +07:00
|
|
|
if (!list_empty(&inode->i_sb_list)) {
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_lock(&inode->i_sb->s_inode_list_lock);
|
2011-07-26 16:36:34 +07:00
|
|
|
list_del_init(&inode->i_sb_list);
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_unlock(&inode->i_sb->s_inode_list_lock);
|
2011-07-26 16:36:34 +07:00
|
|
|
}
|
2010-10-23 18:15:32 +07:00
|
|
|
}
|
|
|
|
|
2010-10-23 17:58:09 +07:00
|
|
|
static unsigned long hash(struct super_block *sb, unsigned long hashval)
|
|
|
|
{
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
|
|
|
|
L1_CACHE_BYTES;
|
2011-05-27 20:28:01 +07:00
|
|
|
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift);
|
|
|
|
return tmp & i_hash_mask;
|
2010-10-23 17:58:09 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __insert_inode_hash - hash an inode
|
|
|
|
* @inode: unhashed inode
|
|
|
|
* @hashval: unsigned long value used to locate this object in the
|
|
|
|
* inode_hashtable.
|
|
|
|
*
|
|
|
|
* Add an inode to the inode hash for this superblock.
|
|
|
|
*/
|
|
|
|
void __insert_inode_hash(struct inode *inode, unsigned long hashval)
|
|
|
|
{
|
2010-10-23 18:15:32 +07:00
|
|
|
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval);
|
|
|
|
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2010-10-23 18:15:32 +07:00
|
|
|
hlist_add_head(&inode->i_hash, b);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2010-10-23 17:58:09 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__insert_inode_hash);
|
|
|
|
|
|
|
|
/**
|
2011-07-28 11:41:09 +07:00
|
|
|
* __remove_inode_hash - remove an inode from the hash
|
2010-10-23 17:58:09 +07:00
|
|
|
* @inode: inode to unhash
|
|
|
|
*
|
|
|
|
* Remove an inode from the superblock.
|
|
|
|
*/
|
2011-07-28 11:41:09 +07:00
|
|
|
void __remove_inode_hash(struct inode *inode)
|
2010-10-23 17:58:09 +07:00
|
|
|
{
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2010-10-23 17:58:09 +07:00
|
|
|
hlist_del_init(&inode->i_hash);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2010-10-23 17:58:09 +07:00
|
|
|
}
|
2011-07-28 11:41:09 +07:00
|
|
|
EXPORT_SYMBOL(__remove_inode_hash);
|
2010-10-23 17:58:09 +07:00
|
|
|
|
2012-05-03 19:48:02 +07:00
|
|
|
void clear_inode(struct inode *inode)
|
2010-06-05 07:55:25 +07:00
|
|
|
{
|
2011-06-28 06:18:10 +07:00
|
|
|
/*
|
2018-04-11 06:36:56 +07:00
|
|
|
* We have to cycle the i_pages lock here because reclaim can be in the
|
2011-06-28 06:18:10 +07:00
|
|
|
* process of removing the last page (in __delete_from_page_cache())
|
2018-04-11 06:36:56 +07:00
|
|
|
* and we must not free the mapping under it.
|
2011-06-28 06:18:10 +07:00
|
|
|
*/
|
2018-04-11 06:36:56 +07:00
|
|
|
xa_lock_irq(&inode->i_data.i_pages);
|
2010-06-05 07:55:25 +07:00
|
|
|
BUG_ON(inode->i_data.nrpages);
|
2016-01-23 06:10:40 +07:00
|
|
|
BUG_ON(inode->i_data.nrexceptional);
|
2018-04-11 06:36:56 +07:00
|
|
|
xa_unlock_irq(&inode->i_data.i_pages);
|
2010-06-05 07:55:25 +07:00
|
|
|
BUG_ON(!list_empty(&inode->i_data.private_list));
|
|
|
|
BUG_ON(!(inode->i_state & I_FREEING));
|
|
|
|
BUG_ON(inode->i_state & I_CLEAR);
|
2016-07-27 05:21:50 +07:00
|
|
|
BUG_ON(!list_empty(&inode->i_wb_list));
|
2011-01-07 13:49:49 +07:00
|
|
|
/* don't need i_lock here, no concurrent mods to i_state */
|
2010-06-05 07:55:25 +07:00
|
|
|
inode->i_state = I_FREEING | I_CLEAR;
|
|
|
|
}
|
2012-05-03 19:48:02 +07:00
|
|
|
EXPORT_SYMBOL(clear_inode);
|
2010-06-05 07:55:25 +07:00
|
|
|
|
2011-03-22 18:23:37 +07:00
|
|
|
/*
|
|
|
|
* Free the inode passed in, removing it from the lists it is still connected
|
|
|
|
* to. We remove any pages still attached to the inode and wait for any IO that
|
|
|
|
* is still in progress before finally destroying the inode.
|
|
|
|
*
|
|
|
|
* An inode must already be marked I_FREEING so that we avoid the inode being
|
|
|
|
* moved back onto lists if we race with other code that manipulates the lists
|
|
|
|
* (e.g. writeback_single_inode). The caller is responsible for setting this.
|
|
|
|
*
|
|
|
|
* An inode must already be removed from the LRU list before being evicted from
|
|
|
|
* the cache. This should occur atomically with setting the I_FREEING state
|
|
|
|
* flag, so no inodes here should ever be on the LRU when being evicted.
|
|
|
|
*/
|
2010-06-08 00:21:05 +07:00
|
|
|
static void evict(struct inode *inode)
|
2010-06-05 06:33:20 +07:00
|
|
|
{
|
|
|
|
const struct super_operations *op = inode->i_sb->s_op;
|
|
|
|
|
2011-03-22 18:23:37 +07:00
|
|
|
BUG_ON(!(inode->i_state & I_FREEING));
|
|
|
|
BUG_ON(!list_empty(&inode->i_lru));
|
|
|
|
|
2015-03-05 02:07:22 +07:00
|
|
|
if (!list_empty(&inode->i_io_list))
|
|
|
|
inode_io_list_del(inode);
|
2011-07-28 11:11:47 +07:00
|
|
|
|
2011-03-22 18:23:40 +07:00
|
|
|
inode_sb_list_del(inode);
|
|
|
|
|
2012-05-03 19:48:03 +07:00
|
|
|
/*
|
|
|
|
* Wait for flusher thread to be done with the inode so that filesystem
|
|
|
|
* does not start destroying it while writeback is still running. Since
|
|
|
|
* the inode has I_FREEING set, flusher thread won't start new work on
|
|
|
|
* the inode. We just have to wait for running writeback to finish.
|
|
|
|
*/
|
|
|
|
inode_wait_for_writeback(inode);
|
2012-05-03 19:48:01 +07:00
|
|
|
|
2010-06-05 06:40:39 +07:00
|
|
|
if (op->evict_inode) {
|
|
|
|
op->evict_inode(inode);
|
2010-06-05 06:33:20 +07:00
|
|
|
} else {
|
2014-04-04 04:47:49 +07:00
|
|
|
truncate_inode_pages_final(&inode->i_data);
|
2012-05-03 19:48:02 +07:00
|
|
|
clear_inode(inode);
|
2010-06-05 06:33:20 +07:00
|
|
|
}
|
2010-06-05 07:19:55 +07:00
|
|
|
if (S_ISBLK(inode->i_mode) && inode->i_bdev)
|
|
|
|
bd_forget(inode);
|
|
|
|
if (S_ISCHR(inode->i_mode) && inode->i_cdev)
|
|
|
|
cd_forget(inode);
|
2011-03-22 18:23:37 +07:00
|
|
|
|
|
|
|
remove_inode_hash(inode);
|
|
|
|
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
wake_up_bit(&inode->i_state, __I_NEW);
|
|
|
|
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
|
|
|
|
destroy_inode(inode);
|
2010-06-05 06:33:20 +07:00
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* dispose_list - dispose of the contents of a local list
|
|
|
|
* @head: the head of the list to free
|
|
|
|
*
|
|
|
|
* Dispose-list gets a local list with local inodes in it, so it doesn't
|
|
|
|
* need to worry about list corruption and SMP locks.
|
|
|
|
*/
|
|
|
|
static void dispose_list(struct list_head *head)
|
|
|
|
{
|
|
|
|
while (!list_empty(head)) {
|
|
|
|
struct inode *inode;
|
|
|
|
|
2010-10-21 07:49:30 +07:00
|
|
|
inode = list_first_entry(head, struct inode, i_lru);
|
|
|
|
list_del_init(&inode->i_lru);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2010-06-08 00:21:05 +07:00
|
|
|
evict(inode);
|
2015-03-05 04:52:52 +07:00
|
|
|
cond_resched();
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-10-26 07:49:35 +07:00
|
|
|
/**
|
|
|
|
* evict_inodes - evict all evictable inodes for a superblock
|
|
|
|
* @sb: superblock to operate on
|
|
|
|
*
|
|
|
|
* Make sure that no inodes with zero refcount are retained. This is
|
2017-11-28 04:05:09 +07:00
|
|
|
* called by superblock shutdown after having SB_ACTIVE flag removed,
|
2010-10-26 07:49:35 +07:00
|
|
|
* so any inode reaching zero refcount during or after that call will
|
|
|
|
* be immediately evicted.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2010-10-26 07:49:35 +07:00
|
|
|
void evict_inodes(struct super_block *sb)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2010-10-26 07:49:35 +07:00
|
|
|
struct inode *inode, *next;
|
|
|
|
LIST_HEAD(dispose);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-03-05 04:52:52 +07:00
|
|
|
again:
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_lock(&sb->s_inode_list_lock);
|
2010-10-26 07:49:35 +07:00
|
|
|
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
|
|
|
|
if (atomic_read(&inode->i_count))
|
2009-03-12 03:17:36 +07:00
|
|
|
continue;
|
2011-03-22 18:23:36 +07:00
|
|
|
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) {
|
|
|
|
spin_unlock(&inode->i_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
2011-03-22 18:23:36 +07:00
|
|
|
}
|
2010-10-26 07:49:35 +07:00
|
|
|
|
|
|
|
inode->i_state |= I_FREEING;
|
2011-03-22 18:23:38 +07:00
|
|
|
inode_lru_list_del(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:38 +07:00
|
|
|
list_add(&inode->i_lru, &dispose);
|
2015-03-05 04:52:52 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* We can have a ton of inodes to evict at unmount time given
|
|
|
|
* enough memory, check to see if we need to go to sleep for a
|
|
|
|
* bit so we don't livelock.
|
|
|
|
*/
|
|
|
|
if (need_resched()) {
|
|
|
|
spin_unlock(&sb->s_inode_list_lock);
|
|
|
|
cond_resched();
|
|
|
|
dispose_list(&dispose);
|
|
|
|
goto again;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_unlock(&sb->s_inode_list_lock);
|
2010-10-26 07:49:35 +07:00
|
|
|
|
|
|
|
dispose_list(&dispose);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2017-08-19 08:08:25 +07:00
|
|
|
EXPORT_SYMBOL_GPL(evict_inodes);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
/**
|
2010-10-25 00:40:33 +07:00
|
|
|
* invalidate_inodes - attempt to free all inodes on a superblock
|
|
|
|
* @sb: superblock to operate on
|
2011-02-24 13:25:47 +07:00
|
|
|
* @kill_dirty: flag to guide handling of dirty inodes
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2010-10-25 00:40:33 +07:00
|
|
|
* Attempts to free all inodes for a given superblock. If there were any
|
|
|
|
* busy inodes return a non-zero value, else zero.
|
2011-02-24 13:25:47 +07:00
|
|
|
* If @kill_dirty is set, discard dirty inodes too, otherwise treat
|
|
|
|
* them as busy.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2011-02-24 13:25:47 +07:00
|
|
|
int invalidate_inodes(struct super_block *sb, bool kill_dirty)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2010-10-23 16:03:02 +07:00
|
|
|
int busy = 0;
|
2010-10-25 00:40:33 +07:00
|
|
|
struct inode *inode, *next;
|
|
|
|
LIST_HEAD(dispose);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_lock(&sb->s_inode_list_lock);
|
2010-10-25 00:40:33 +07:00
|
|
|
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) {
|
|
|
|
spin_unlock(&inode->i_lock);
|
2009-03-12 03:17:36 +07:00
|
|
|
continue;
|
2011-03-22 18:23:36 +07:00
|
|
|
}
|
2015-02-02 12:37:00 +07:00
|
|
|
if (inode->i_state & I_DIRTY_ALL && !kill_dirty) {
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-02-24 13:25:47 +07:00
|
|
|
busy = 1;
|
|
|
|
continue;
|
|
|
|
}
|
2010-10-24 00:07:20 +07:00
|
|
|
if (atomic_read(&inode->i_count)) {
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2010-10-24 00:07:20 +07:00
|
|
|
busy = 1;
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
|
|
|
}
|
2010-10-24 00:07:20 +07:00
|
|
|
|
|
|
|
inode->i_state |= I_FREEING;
|
2011-03-22 18:23:38 +07:00
|
|
|
inode_lru_list_del(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:38 +07:00
|
|
|
list_add(&inode->i_lru, &dispose);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_unlock(&sb->s_inode_list_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2010-10-25 00:40:33 +07:00
|
|
|
dispose_list(&dispose);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
return busy;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2013-08-28 07:17:58 +07:00
|
|
|
* Isolate the inode from the LRU in preparation for freeing it.
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
|
|
|
* Any inodes which are pinned purely because of attached pagecache have their
|
2010-10-23 17:55:17 +07:00
|
|
|
* pagecache removed. If the inode has metadata buffers attached to
|
|
|
|
* mapping->private_list then try to remove them.
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2010-10-23 17:55:17 +07:00
|
|
|
* If the inode has the I_REFERENCED flag set, then it means that it has been
|
|
|
|
* used recently - the flag is set in iput_final(). When we encounter such an
|
|
|
|
* inode, clear the flag and move it to the back of the LRU so it gets another
|
|
|
|
* pass through the LRU before it gets reclaimed. This is necessary because of
|
|
|
|
* the fact we are doing lazy LRU updates to minimise lock contention so the
|
|
|
|
* LRU does not have strict ordering. Hence we don't want to reclaim inodes
|
|
|
|
* with this flag set because they are the inodes that are out of order.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2015-02-13 05:59:35 +07:00
|
|
|
static enum lru_status inode_lru_isolate(struct list_head *item,
|
|
|
|
struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2013-08-28 07:17:58 +07:00
|
|
|
struct list_head *freeable = arg;
|
|
|
|
struct inode *inode = container_of(item, struct inode, i_lru);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
/*
|
|
|
|
* we are inverting the lru lock/inode->i_lock here, so use a trylock.
|
|
|
|
* If we fail to get the lock, just skip it.
|
|
|
|
*/
|
|
|
|
if (!spin_trylock(&inode->i_lock))
|
|
|
|
return LRU_SKIP;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
/*
|
|
|
|
* Referenced or dirty inodes are still in use. Give them another pass
|
|
|
|
* through the LRU as we canot reclaim them now.
|
|
|
|
*/
|
|
|
|
if (atomic_read(&inode->i_count) ||
|
|
|
|
(inode->i_state & ~I_REFERENCED)) {
|
2015-02-13 05:59:35 +07:00
|
|
|
list_lru_isolate(lru, &inode->i_lru);
|
2013-08-28 07:17:58 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
this_cpu_dec(nr_unused);
|
|
|
|
return LRU_REMOVED;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2019-02-13 06:35:51 +07:00
|
|
|
/* recently referenced inodes get one more pass */
|
|
|
|
if (inode->i_state & I_REFERENCED) {
|
2013-08-28 07:17:58 +07:00
|
|
|
inode->i_state &= ~I_REFERENCED;
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return LRU_ROTATE;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
if (inode_has_buffers(inode) || inode->i_data.nrpages) {
|
|
|
|
__iget(inode);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
spin_unlock(lru_lock);
|
|
|
|
if (remove_inode_buffers(inode)) {
|
|
|
|
unsigned long reap;
|
|
|
|
reap = invalidate_mapping_pages(&inode->i_data, 0, -1);
|
|
|
|
if (current_is_kswapd())
|
|
|
|
__count_vm_events(KSWAPD_INODESTEAL, reap);
|
|
|
|
else
|
|
|
|
__count_vm_events(PGINODESTEAL, reap);
|
|
|
|
if (current->reclaim_state)
|
|
|
|
current->reclaim_state->reclaimed_slab += reap;
|
2011-03-22 18:23:38 +07:00
|
|
|
}
|
2013-08-28 07:17:58 +07:00
|
|
|
iput(inode);
|
|
|
|
spin_lock(lru_lock);
|
|
|
|
return LRU_RETRY;
|
|
|
|
}
|
2011-03-22 18:23:38 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
WARN_ON(inode->i_state & I_NEW);
|
|
|
|
inode->i_state |= I_FREEING;
|
2015-02-13 05:59:35 +07:00
|
|
|
list_lru_isolate_move(lru, &inode->i_lru, freeable);
|
2013-08-28 07:17:58 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2010-10-23 17:55:17 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
this_cpu_dec(nr_unused);
|
|
|
|
return LRU_REMOVED;
|
|
|
|
}
|
2010-10-21 07:49:30 +07:00
|
|
|
|
2013-08-28 07:17:58 +07:00
|
|
|
/*
|
|
|
|
* Walk the superblock inode LRU for freeable inodes and attempt to free them.
|
|
|
|
* This is called from the superblock shrinker function with a number of inodes
|
|
|
|
* to trim from the LRU. Inodes to be freed are moved to a temporary list and
|
|
|
|
* then are freed outside inode_lock by dispose_list().
|
|
|
|
*/
|
list_lru: introduce list_lru_shrink_{count,walk}
Kmem accounting of memcg is unusable now, because it lacks slab shrinker
support. That means when we hit the limit we will get ENOMEM w/o any
chance to recover. What we should do then is to call shrink_slab, which
would reclaim old inode/dentry caches from this cgroup. This is what
this patch set is intended to do.
Basically, it does two things. First, it introduces the notion of
per-memcg slab shrinker. A shrinker that wants to reclaim objects per
cgroup should mark itself as SHRINKER_MEMCG_AWARE. Then it will be
passed the memory cgroup to scan from in shrink_control->memcg. For
such shrinkers shrink_slab iterates over the whole cgroup subtree under
the target cgroup and calls the shrinker for each kmem-active memory
cgroup.
Secondly, this patch set makes the list_lru structure per-memcg. It's
done transparently to list_lru users - everything they have to do is to
tell list_lru_init that they want memcg-aware list_lru. Then the
list_lru will automatically distribute objects among per-memcg lists
basing on which cgroup the object is accounted to. This way to make FS
shrinkers (icache, dcache) memcg-aware we only need to make them use
memcg-aware list_lru, and this is what this patch set does.
As before, this patch set only enables per-memcg kmem reclaim when the
pressure goes from memory.limit, not from memory.kmem.limit. Handling
memory.kmem.limit is going to be tricky due to GFP_NOFS allocations, and
it is still unclear whether we will have this knob in the unified
hierarchy.
This patch (of 9):
NUMA aware slab shrinkers use the list_lru structure to distribute
objects coming from different NUMA nodes to different lists. Whenever
such a shrinker needs to count or scan objects from a particular node,
it issues commands like this:
count = list_lru_count_node(lru, sc->nid);
freed = list_lru_walk_node(lru, sc->nid, isolate_func,
isolate_arg, &sc->nr_to_scan);
where sc is an instance of the shrink_control structure passed to it
from vmscan.
To simplify this, let's add special list_lru functions to be used by
shrinkers, list_lru_shrink_count() and list_lru_shrink_walk(), which
consolidate the nid and nr_to_scan arguments in the shrink_control
structure.
This will also allow us to avoid patching shrinkers that use list_lru
when we make shrink_slab() per-memcg - all we will have to do is extend
the shrink_control structure to include the target memcg and make
list_lru_shrink_{count,walk} handle this appropriately.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Suggested-by: Dave Chinner <david@fromorbit.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-13 05:58:47 +07:00
|
|
|
long prune_icache_sb(struct super_block *sb, struct shrink_control *sc)
|
2013-08-28 07:17:58 +07:00
|
|
|
{
|
|
|
|
LIST_HEAD(freeable);
|
|
|
|
long freed;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
list_lru: introduce list_lru_shrink_{count,walk}
Kmem accounting of memcg is unusable now, because it lacks slab shrinker
support. That means when we hit the limit we will get ENOMEM w/o any
chance to recover. What we should do then is to call shrink_slab, which
would reclaim old inode/dentry caches from this cgroup. This is what
this patch set is intended to do.
Basically, it does two things. First, it introduces the notion of
per-memcg slab shrinker. A shrinker that wants to reclaim objects per
cgroup should mark itself as SHRINKER_MEMCG_AWARE. Then it will be
passed the memory cgroup to scan from in shrink_control->memcg. For
such shrinkers shrink_slab iterates over the whole cgroup subtree under
the target cgroup and calls the shrinker for each kmem-active memory
cgroup.
Secondly, this patch set makes the list_lru structure per-memcg. It's
done transparently to list_lru users - everything they have to do is to
tell list_lru_init that they want memcg-aware list_lru. Then the
list_lru will automatically distribute objects among per-memcg lists
basing on which cgroup the object is accounted to. This way to make FS
shrinkers (icache, dcache) memcg-aware we only need to make them use
memcg-aware list_lru, and this is what this patch set does.
As before, this patch set only enables per-memcg kmem reclaim when the
pressure goes from memory.limit, not from memory.kmem.limit. Handling
memory.kmem.limit is going to be tricky due to GFP_NOFS allocations, and
it is still unclear whether we will have this knob in the unified
hierarchy.
This patch (of 9):
NUMA aware slab shrinkers use the list_lru structure to distribute
objects coming from different NUMA nodes to different lists. Whenever
such a shrinker needs to count or scan objects from a particular node,
it issues commands like this:
count = list_lru_count_node(lru, sc->nid);
freed = list_lru_walk_node(lru, sc->nid, isolate_func,
isolate_arg, &sc->nr_to_scan);
where sc is an instance of the shrink_control structure passed to it
from vmscan.
To simplify this, let's add special list_lru functions to be used by
shrinkers, list_lru_shrink_count() and list_lru_shrink_walk(), which
consolidate the nid and nr_to_scan arguments in the shrink_control
structure.
This will also allow us to avoid patching shrinkers that use list_lru
when we make shrink_slab() per-memcg - all we will have to do is extend
the shrink_control structure to include the target memcg and make
list_lru_shrink_{count,walk} handle this appropriately.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Suggested-by: Dave Chinner <david@fromorbit.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-13 05:58:47 +07:00
|
|
|
freed = list_lru_shrink_walk(&sb->s_inode_lru, sc,
|
|
|
|
inode_lru_isolate, &freeable);
|
2005-04-17 05:20:36 +07:00
|
|
|
dispose_list(&freeable);
|
2013-08-28 07:17:57 +07:00
|
|
|
return freed;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __wait_on_freeing_inode(struct inode *inode);
|
|
|
|
/*
|
|
|
|
* Called with the inode lock held.
|
|
|
|
*/
|
2009-03-31 21:05:54 +07:00
|
|
|
static struct inode *find_inode(struct super_block *sb,
|
|
|
|
struct hlist_head *head,
|
|
|
|
int (*test)(struct inode *, void *),
|
|
|
|
void *data)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *inode = NULL;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
repeat:
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 08:06:00 +07:00
|
|
|
hlist_for_each_entry(inode, head, i_hash) {
|
2013-11-06 21:54:52 +07:00
|
|
|
if (inode->i_sb != sb)
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
2013-11-06 21:54:52 +07:00
|
|
|
if (!test(inode, data))
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
2013-11-06 21:54:52 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2010-06-03 04:38:30 +07:00
|
|
|
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
|
2005-04-17 05:20:36 +07:00
|
|
|
__wait_on_freeing_inode(inode);
|
|
|
|
goto repeat;
|
|
|
|
}
|
2018-06-29 02:53:17 +07:00
|
|
|
if (unlikely(inode->i_state & I_CREATING)) {
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
}
|
2010-10-23 18:09:06 +07:00
|
|
|
__iget(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2010-10-23 18:09:06 +07:00
|
|
|
return inode;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2010-10-23 18:09:06 +07:00
|
|
|
return NULL;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* find_inode_fast is the fast path version of find_inode, see the comment at
|
|
|
|
* iget_locked for details.
|
|
|
|
*/
|
2009-03-31 21:05:54 +07:00
|
|
|
static struct inode *find_inode_fast(struct super_block *sb,
|
|
|
|
struct hlist_head *head, unsigned long ino)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *inode = NULL;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
repeat:
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 08:06:00 +07:00
|
|
|
hlist_for_each_entry(inode, head, i_hash) {
|
2013-11-06 21:54:52 +07:00
|
|
|
if (inode->i_ino != ino)
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
2013-11-06 21:54:52 +07:00
|
|
|
if (inode->i_sb != sb)
|
2005-04-17 05:20:36 +07:00
|
|
|
continue;
|
2013-11-06 21:54:52 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2010-06-03 04:38:30 +07:00
|
|
|
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
|
2005-04-17 05:20:36 +07:00
|
|
|
__wait_on_freeing_inode(inode);
|
|
|
|
goto repeat;
|
|
|
|
}
|
2018-06-29 02:53:17 +07:00
|
|
|
if (unlikely(inode->i_state & I_CREATING)) {
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
}
|
2010-10-23 18:09:06 +07:00
|
|
|
__iget(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2010-10-23 18:09:06 +07:00
|
|
|
return inode;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2010-10-23 18:09:06 +07:00
|
|
|
return NULL;
|
2008-10-30 13:35:24 +07:00
|
|
|
}
|
|
|
|
|
2010-10-23 22:18:01 +07:00
|
|
|
/*
|
|
|
|
* Each cpu owns a range of LAST_INO_BATCH numbers.
|
|
|
|
* 'shared_last_ino' is dirtied only once out of LAST_INO_BATCH allocations,
|
|
|
|
* to renew the exhausted range.
|
2008-10-30 13:35:24 +07:00
|
|
|
*
|
2010-10-23 22:18:01 +07:00
|
|
|
* This does not significantly increase overflow rate because every CPU can
|
|
|
|
* consume at most LAST_INO_BATCH-1 unused inode numbers. So there is
|
|
|
|
* NR_CPUS*(LAST_INO_BATCH-1) wastage. At 4096 and 1024, this is ~0.1% of the
|
|
|
|
* 2^32 range, and is a worst-case. Even a 50% wastage would only increase
|
|
|
|
* overflow rate by 2x, which does not seem too significant.
|
|
|
|
*
|
|
|
|
* On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW
|
|
|
|
* error if st_ino won't fit in target struct field. Use 32bit counter
|
|
|
|
* here to attempt to avoid that.
|
2008-10-30 13:35:24 +07:00
|
|
|
*/
|
2010-10-23 22:18:01 +07:00
|
|
|
#define LAST_INO_BATCH 1024
|
|
|
|
static DEFINE_PER_CPU(unsigned int, last_ino);
|
|
|
|
|
2010-10-23 22:19:54 +07:00
|
|
|
unsigned int get_next_ino(void)
|
2008-10-30 13:35:24 +07:00
|
|
|
{
|
2010-10-23 22:18:01 +07:00
|
|
|
unsigned int *p = &get_cpu_var(last_ino);
|
|
|
|
unsigned int res = *p;
|
2008-10-30 13:35:24 +07:00
|
|
|
|
2010-10-23 22:18:01 +07:00
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) {
|
|
|
|
static atomic_t shared_last_ino;
|
|
|
|
int next = atomic_add_return(LAST_INO_BATCH, &shared_last_ino);
|
|
|
|
|
|
|
|
res = next - LAST_INO_BATCH;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
vfs: avoid creation of inode number 0 in get_next_ino
currently, get_next_ino() is able to create inodes with inode number = 0.
This have a bad impact in the filesystems relying in this function to generate
inode numbers.
While there is no problem at all in having inodes with number 0, userspace tools
which handle file management tasks can have problems handling these files, like
for example, the impossiblity of users to delete these files, since glibc will
ignore them. So, I believe the best way is kernel to avoid creating them.
This problem has been raised previously, but the old thread didn't have any
other update for a year+, and I've seen too many users hitting the same issue
regarding the impossibility to delete files while using filesystems relying on
this function. So, I'm starting the thread again, with the same patch
that I believe is enough to address this problem.
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-06-25 22:25:58 +07:00
|
|
|
res++;
|
|
|
|
/* get_next_ino should not provide a 0 inode number */
|
|
|
|
if (unlikely(!res))
|
|
|
|
res++;
|
|
|
|
*p = res;
|
2010-10-23 22:18:01 +07:00
|
|
|
put_cpu_var(last_ino);
|
|
|
|
return res;
|
2008-10-30 13:35:24 +07:00
|
|
|
}
|
2010-10-23 22:19:54 +07:00
|
|
|
EXPORT_SYMBOL(get_next_ino);
|
2008-10-30 13:35:24 +07:00
|
|
|
|
2011-07-26 16:36:34 +07:00
|
|
|
/**
|
|
|
|
* new_inode_pseudo - obtain an inode
|
|
|
|
* @sb: superblock
|
|
|
|
*
|
|
|
|
* Allocates a new inode for given superblock.
|
|
|
|
* Inode wont be chained in superblock s_inodes list
|
|
|
|
* This means :
|
|
|
|
* - fs can't be unmount
|
|
|
|
* - quotas, fsnotify, writeback can't work
|
|
|
|
*/
|
|
|
|
struct inode *new_inode_pseudo(struct super_block *sb)
|
|
|
|
{
|
|
|
|
struct inode *inode = alloc_inode(sb);
|
|
|
|
|
|
|
|
if (inode) {
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
inode->i_state = 0;
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
INIT_LIST_HEAD(&inode->i_sb_list);
|
|
|
|
}
|
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/**
|
|
|
|
* new_inode - obtain an inode
|
|
|
|
* @sb: superblock
|
|
|
|
*
|
2007-07-17 18:03:05 +07:00
|
|
|
* Allocates a new inode for given superblock. The default gfp_mask
|
2009-01-07 05:39:23 +07:00
|
|
|
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE.
|
2007-07-17 18:03:05 +07:00
|
|
|
* If HIGHMEM pages are unsuitable or it is known that pages allocated
|
|
|
|
* for the page cache are not reclaimable or migratable,
|
|
|
|
* mapping_set_gfp_mask() must be called with suitable flags on the
|
|
|
|
* newly created inode's mapping
|
|
|
|
*
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
struct inode *new_inode(struct super_block *sb)
|
|
|
|
{
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *inode;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-03-05 00:37:22 +07:00
|
|
|
spin_lock_prefetch(&sb->s_inode_list_lock);
|
2009-03-31 21:05:54 +07:00
|
|
|
|
2011-07-26 16:36:34 +07:00
|
|
|
inode = new_inode_pseudo(sb);
|
|
|
|
if (inode)
|
2011-03-22 18:23:40 +07:00
|
|
|
inode_sb_list_add(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(new_inode);
|
|
|
|
|
2007-10-14 06:38:33 +07:00
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
lockdep: Add helper function for dir vs file i_mutex annotation
Purely in-memory filesystems do not use the inode hash as the dcache
tells us if an entry already exists. As a result, they do not call
unlock_new_inode, and thus directory inodes do not get put into a
different lockdep class for i_sem.
We need the different lockdep classes, because the locking order for
i_mutex is different for directory inodes and regular inodes. Directory
inodes can do "readdir()", which takes i_mutex *before* possibly taking
mm->mmap_sem (due to a page fault while copying the directory entry to
user space).
In contrast, regular inodes can be mmap'ed, which takes mm->mmap_sem
before accessing i_mutex.
The two cases can never happen for the same inode, so no real deadlock
can occur, but without the different lockdep classes, lockdep cannot
understand that. As a result, if CONFIG_DEBUG_LOCK_ALLOC is set, this
can lead to false positives from lockdep like below:
find/645 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff81109514>] might_fault+0x5c/0xac
but task is already holding lock:
(&sb->s_type->i_mutex_key#15){+.+.+.}, at: [<ffffffff81149f34>]
vfs_readdir+0x5b/0xb4
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#15){+.+.+.}:
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff814db822>] __mutex_lock_common+0x4c/0x361
[<ffffffff814dbc46>] mutex_lock_nested+0x40/0x45
[<ffffffff811daa87>] hugetlbfs_file_mmap+0x82/0x110
[<ffffffff81111557>] mmap_region+0x258/0x432
[<ffffffff811119dd>] do_mmap_pgoff+0x2ac/0x306
[<ffffffff81111b4f>] sys_mmap_pgoff+0x118/0x16a
[<ffffffff8100c858>] sys_mmap+0x22/0x24
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
-> #0 (&mm->mmap_sem){++++++}:
[<ffffffff8108a4bc>] __lock_acquire+0xa1a/0xcf7
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff81109541>] might_fault+0x89/0xac
[<ffffffff81149cff>] filldir+0x6f/0xc7
[<ffffffff811586ea>] dcache_readdir+0x67/0x205
[<ffffffff81149f54>] vfs_readdir+0x7b/0xb4
[<ffffffff8114a073>] sys_getdents+0x7e/0xd1
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
This patch moves the directory vs file lockdep annotation into a helper
function that can be called by in-memory filesystems and has hugetlbfs
call it.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-08-25 18:48:12 +07:00
|
|
|
void lockdep_annotate_inode_mutex_key(struct inode *inode)
|
|
|
|
{
|
2010-10-11 20:38:00 +07:00
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
2007-10-16 11:47:54 +07:00
|
|
|
struct file_system_type *type = inode->i_sb->s_type;
|
|
|
|
|
2009-06-04 20:26:49 +07:00
|
|
|
/* Set new key only if filesystem hasn't already changed it */
|
2016-04-16 02:08:36 +07:00
|
|
|
if (lockdep_match_class(&inode->i_rwsem, &type->i_mutex_key)) {
|
2009-06-04 20:26:49 +07:00
|
|
|
/*
|
|
|
|
* ensure nobody is actually holding i_mutex
|
|
|
|
*/
|
2016-04-16 02:08:36 +07:00
|
|
|
// mutex_destroy(&inode->i_mutex);
|
|
|
|
init_rwsem(&inode->i_rwsem);
|
|
|
|
lockdep_set_class(&inode->i_rwsem,
|
2009-06-04 20:26:49 +07:00
|
|
|
&type->i_mutex_dir_key);
|
|
|
|
}
|
2007-10-16 11:47:54 +07:00
|
|
|
}
|
lockdep: Add helper function for dir vs file i_mutex annotation
Purely in-memory filesystems do not use the inode hash as the dcache
tells us if an entry already exists. As a result, they do not call
unlock_new_inode, and thus directory inodes do not get put into a
different lockdep class for i_sem.
We need the different lockdep classes, because the locking order for
i_mutex is different for directory inodes and regular inodes. Directory
inodes can do "readdir()", which takes i_mutex *before* possibly taking
mm->mmap_sem (due to a page fault while copying the directory entry to
user space).
In contrast, regular inodes can be mmap'ed, which takes mm->mmap_sem
before accessing i_mutex.
The two cases can never happen for the same inode, so no real deadlock
can occur, but without the different lockdep classes, lockdep cannot
understand that. As a result, if CONFIG_DEBUG_LOCK_ALLOC is set, this
can lead to false positives from lockdep like below:
find/645 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff81109514>] might_fault+0x5c/0xac
but task is already holding lock:
(&sb->s_type->i_mutex_key#15){+.+.+.}, at: [<ffffffff81149f34>]
vfs_readdir+0x5b/0xb4
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#15){+.+.+.}:
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff814db822>] __mutex_lock_common+0x4c/0x361
[<ffffffff814dbc46>] mutex_lock_nested+0x40/0x45
[<ffffffff811daa87>] hugetlbfs_file_mmap+0x82/0x110
[<ffffffff81111557>] mmap_region+0x258/0x432
[<ffffffff811119dd>] do_mmap_pgoff+0x2ac/0x306
[<ffffffff81111b4f>] sys_mmap_pgoff+0x118/0x16a
[<ffffffff8100c858>] sys_mmap+0x22/0x24
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
-> #0 (&mm->mmap_sem){++++++}:
[<ffffffff8108a4bc>] __lock_acquire+0xa1a/0xcf7
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff81109541>] might_fault+0x89/0xac
[<ffffffff81149cff>] filldir+0x6f/0xc7
[<ffffffff811586ea>] dcache_readdir+0x67/0x205
[<ffffffff81149f54>] vfs_readdir+0x7b/0xb4
[<ffffffff8114a073>] sys_getdents+0x7e/0xd1
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
This patch moves the directory vs file lockdep annotation into a helper
function that can be called by in-memory filesystems and has hugetlbfs
call it.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-08-25 18:48:12 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key);
|
2007-10-14 06:38:33 +07:00
|
|
|
#endif
|
lockdep: Add helper function for dir vs file i_mutex annotation
Purely in-memory filesystems do not use the inode hash as the dcache
tells us if an entry already exists. As a result, they do not call
unlock_new_inode, and thus directory inodes do not get put into a
different lockdep class for i_sem.
We need the different lockdep classes, because the locking order for
i_mutex is different for directory inodes and regular inodes. Directory
inodes can do "readdir()", which takes i_mutex *before* possibly taking
mm->mmap_sem (due to a page fault while copying the directory entry to
user space).
In contrast, regular inodes can be mmap'ed, which takes mm->mmap_sem
before accessing i_mutex.
The two cases can never happen for the same inode, so no real deadlock
can occur, but without the different lockdep classes, lockdep cannot
understand that. As a result, if CONFIG_DEBUG_LOCK_ALLOC is set, this
can lead to false positives from lockdep like below:
find/645 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff81109514>] might_fault+0x5c/0xac
but task is already holding lock:
(&sb->s_type->i_mutex_key#15){+.+.+.}, at: [<ffffffff81149f34>]
vfs_readdir+0x5b/0xb4
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#15){+.+.+.}:
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff814db822>] __mutex_lock_common+0x4c/0x361
[<ffffffff814dbc46>] mutex_lock_nested+0x40/0x45
[<ffffffff811daa87>] hugetlbfs_file_mmap+0x82/0x110
[<ffffffff81111557>] mmap_region+0x258/0x432
[<ffffffff811119dd>] do_mmap_pgoff+0x2ac/0x306
[<ffffffff81111b4f>] sys_mmap_pgoff+0x118/0x16a
[<ffffffff8100c858>] sys_mmap+0x22/0x24
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
-> #0 (&mm->mmap_sem){++++++}:
[<ffffffff8108a4bc>] __lock_acquire+0xa1a/0xcf7
[<ffffffff8108ac26>] lock_acquire+0xbf/0x103
[<ffffffff81109541>] might_fault+0x89/0xac
[<ffffffff81149cff>] filldir+0x6f/0xc7
[<ffffffff811586ea>] dcache_readdir+0x67/0x205
[<ffffffff81149f54>] vfs_readdir+0x7b/0xb4
[<ffffffff8114a073>] sys_getdents+0x7e/0xd1
[<ffffffff814e3ec2>] system_call_fastpath+0x16/0x1b
This patch moves the directory vs file lockdep annotation into a helper
function that can be called by in-memory filesystems and has hugetlbfs
call it.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-08-25 18:48:12 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* unlock_new_inode - clear the I_NEW state and wake up any waiters
|
|
|
|
* @inode: new inode to unlock
|
|
|
|
*
|
|
|
|
* Called when the inode is fully initialised to clear the new state of the
|
|
|
|
* inode and wake up anyone waiting for the inode to finish initialisation.
|
|
|
|
*/
|
|
|
|
void unlock_new_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
lockdep_annotate_inode_mutex_key(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2009-12-17 20:25:01 +07:00
|
|
|
WARN_ON(!(inode->i_state & I_NEW));
|
2018-06-29 02:53:17 +07:00
|
|
|
inode->i_state &= ~I_NEW & ~I_CREATING;
|
2012-03-11 05:07:28 +07:00
|
|
|
smp_mb();
|
2011-03-22 18:23:36 +07:00
|
|
|
wake_up_bit(&inode->i_state, __I_NEW);
|
|
|
|
spin_unlock(&inode->i_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(unlock_new_inode);
|
|
|
|
|
2018-06-29 02:53:17 +07:00
|
|
|
void discard_new_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
lockdep_annotate_inode_mutex_key(inode);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
WARN_ON(!(inode->i_state & I_NEW));
|
|
|
|
inode->i_state &= ~I_NEW;
|
|
|
|
smp_mb();
|
|
|
|
wake_up_bit(&inode->i_state, __I_NEW);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
iput(inode);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(discard_new_inode);
|
|
|
|
|
2012-04-19 02:16:33 +07:00
|
|
|
/**
|
|
|
|
* lock_two_nondirectories - take two i_mutexes on non-directory objects
|
2014-04-01 22:08:43 +07:00
|
|
|
*
|
|
|
|
* Lock any non-NULL argument that is not a directory.
|
|
|
|
* Zero, one or two objects may be locked by this function.
|
|
|
|
*
|
2012-04-19 02:16:33 +07:00
|
|
|
* @inode1: first inode to lock
|
|
|
|
* @inode2: second inode to lock
|
|
|
|
*/
|
|
|
|
void lock_two_nondirectories(struct inode *inode1, struct inode *inode2)
|
|
|
|
{
|
2014-04-01 22:08:43 +07:00
|
|
|
if (inode1 > inode2)
|
|
|
|
swap(inode1, inode2);
|
|
|
|
|
|
|
|
if (inode1 && !S_ISDIR(inode1->i_mode))
|
2016-01-23 03:40:57 +07:00
|
|
|
inode_lock(inode1);
|
2014-04-01 22:08:43 +07:00
|
|
|
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1)
|
2016-01-23 03:40:57 +07:00
|
|
|
inode_lock_nested(inode2, I_MUTEX_NONDIR2);
|
2012-04-19 02:16:33 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(lock_two_nondirectories);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* unlock_two_nondirectories - release locks from lock_two_nondirectories()
|
|
|
|
* @inode1: first inode to unlock
|
|
|
|
* @inode2: second inode to unlock
|
|
|
|
*/
|
|
|
|
void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2)
|
|
|
|
{
|
2014-04-01 22:08:43 +07:00
|
|
|
if (inode1 && !S_ISDIR(inode1->i_mode))
|
2016-01-23 03:40:57 +07:00
|
|
|
inode_unlock(inode1);
|
2014-04-01 22:08:43 +07:00
|
|
|
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1)
|
2016-01-23 03:40:57 +07:00
|
|
|
inode_unlock(inode2);
|
2012-04-19 02:16:33 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(unlock_two_nondirectories);
|
|
|
|
|
2018-05-17 15:53:05 +07:00
|
|
|
/**
|
|
|
|
* inode_insert5 - obtain an inode from a mounted file system
|
|
|
|
* @inode: pre-allocated inode to use for insert to cache
|
|
|
|
* @hashval: hash value (usually inode number) to get
|
|
|
|
* @test: callback used for comparisons between inodes
|
|
|
|
* @set: callback used to initialize a new struct inode
|
|
|
|
* @data: opaque data pointer to pass to @test and @set
|
|
|
|
*
|
|
|
|
* Search for the inode specified by @hashval and @data in the inode cache,
|
|
|
|
* and if present it is return it with an increased reference count. This is
|
|
|
|
* a variant of iget5_locked() for callers that don't want to fail on memory
|
|
|
|
* allocation of inode.
|
|
|
|
*
|
|
|
|
* If the inode is not in cache, insert the pre-allocated inode to cache and
|
|
|
|
* return it locked, hashed, and with the I_NEW flag set. The file system gets
|
|
|
|
* to fill it in before unlocking it via unlock_new_inode().
|
|
|
|
*
|
|
|
|
* Note both @test and @set are called with the inode_hash_lock held, so can't
|
|
|
|
* sleep.
|
|
|
|
*/
|
|
|
|
struct inode *inode_insert5(struct inode *inode, unsigned long hashval,
|
|
|
|
int (*test)(struct inode *, void *),
|
|
|
|
int (*set)(struct inode *, void *), void *data)
|
|
|
|
{
|
|
|
|
struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval);
|
|
|
|
struct inode *old;
|
2018-07-24 20:01:55 +07:00
|
|
|
bool creating = inode->i_state & I_CREATING;
|
2018-05-17 15:53:05 +07:00
|
|
|
|
|
|
|
again:
|
|
|
|
spin_lock(&inode_hash_lock);
|
|
|
|
old = find_inode(inode->i_sb, head, test, data);
|
|
|
|
if (unlikely(old)) {
|
|
|
|
/*
|
|
|
|
* Uhhuh, somebody else created the same inode under us.
|
|
|
|
* Use the old inode instead of the preallocated one.
|
|
|
|
*/
|
|
|
|
spin_unlock(&inode_hash_lock);
|
2018-06-29 02:53:17 +07:00
|
|
|
if (IS_ERR(old))
|
|
|
|
return NULL;
|
2018-05-17 15:53:05 +07:00
|
|
|
wait_on_inode(old);
|
|
|
|
if (unlikely(inode_unhashed(old))) {
|
|
|
|
iput(old);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
return old;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (set && unlikely(set(inode, data))) {
|
|
|
|
inode = NULL;
|
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return the locked inode with I_NEW set, the
|
|
|
|
* caller is responsible for filling in the contents
|
|
|
|
*/
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
inode->i_state |= I_NEW;
|
|
|
|
hlist_add_head(&inode->i_hash, head);
|
|
|
|
spin_unlock(&inode->i_lock);
|
2018-07-24 20:01:55 +07:00
|
|
|
if (!creating)
|
|
|
|
inode_sb_list_add(inode);
|
2018-05-17 15:53:05 +07:00
|
|
|
unlock:
|
|
|
|
spin_unlock(&inode_hash_lock);
|
|
|
|
|
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_insert5);
|
|
|
|
|
2011-03-24 02:03:28 +07:00
|
|
|
/**
|
|
|
|
* iget5_locked - obtain an inode from a mounted file system
|
|
|
|
* @sb: super block of file system
|
|
|
|
* @hashval: hash value (usually inode number) to get
|
|
|
|
* @test: callback used for comparisons between inodes
|
|
|
|
* @set: callback used to initialize a new struct inode
|
|
|
|
* @data: opaque data pointer to pass to @test and @set
|
|
|
|
*
|
|
|
|
* Search for the inode specified by @hashval and @data in the inode cache,
|
|
|
|
* and if present it is return it with an increased reference count. This is
|
|
|
|
* a generalized version of iget_locked() for file systems where the inode
|
|
|
|
* number is not sufficient for unique identification of an inode.
|
|
|
|
*
|
|
|
|
* If the inode is not in cache, allocate a new inode and return it locked,
|
|
|
|
* hashed, and with the I_NEW flag set. The file system gets to fill it in
|
|
|
|
* before unlocking it via unlock_new_inode().
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Note both @test and @set are called with the inode_hash_lock held, so can't
|
|
|
|
* sleep.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2011-03-24 02:03:28 +07:00
|
|
|
struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
|
|
|
|
int (*test)(struct inode *, void *),
|
|
|
|
int (*set)(struct inode *, void *), void *data)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2018-05-17 15:53:05 +07:00
|
|
|
struct inode *inode = ilookup5(sb, hashval, test, data);
|
2011-03-24 02:03:28 +07:00
|
|
|
|
2018-05-17 15:53:05 +07:00
|
|
|
if (!inode) {
|
2018-07-24 20:01:55 +07:00
|
|
|
struct inode *new = alloc_inode(sb);
|
2011-03-24 02:03:28 +07:00
|
|
|
|
2018-05-17 15:53:05 +07:00
|
|
|
if (new) {
|
2018-07-24 20:01:55 +07:00
|
|
|
new->i_state = 0;
|
2018-05-17 15:53:05 +07:00
|
|
|
inode = inode_insert5(new, hashval, test, set, data);
|
|
|
|
if (unlikely(inode != new))
|
2018-07-24 20:01:55 +07:00
|
|
|
destroy_inode(new);
|
2016-07-04 10:15:21 +07:00
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
return inode;
|
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
EXPORT_SYMBOL(iget5_locked);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2011-03-24 02:03:28 +07:00
|
|
|
/**
|
|
|
|
* iget_locked - obtain an inode from a mounted file system
|
|
|
|
* @sb: super block of file system
|
|
|
|
* @ino: inode number to get
|
|
|
|
*
|
|
|
|
* Search for the inode specified by @ino in the inode cache and if present
|
|
|
|
* return it with an increased reference count. This is for file systems
|
|
|
|
* where the inode number is sufficient for unique identification of an inode.
|
|
|
|
*
|
|
|
|
* If the inode is not in cache, allocate a new inode and return it locked,
|
|
|
|
* hashed, and with the I_NEW flag set. The file system gets to fill it in
|
|
|
|
* before unlocking it via unlock_new_inode().
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2011-03-24 02:03:28 +07:00
|
|
|
struct inode *iget_locked(struct super_block *sb, unsigned long ino)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2011-03-24 02:03:28 +07:00
|
|
|
struct hlist_head *head = inode_hashtable + hash(sb, ino);
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *inode;
|
2016-07-04 10:15:21 +07:00
|
|
|
again:
|
2011-03-24 02:03:28 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
|
|
|
inode = find_inode_fast(sb, head, ino);
|
|
|
|
spin_unlock(&inode_hash_lock);
|
|
|
|
if (inode) {
|
2018-06-29 02:53:17 +07:00
|
|
|
if (IS_ERR(inode))
|
|
|
|
return NULL;
|
2011-03-24 02:03:28 +07:00
|
|
|
wait_on_inode(inode);
|
2016-07-04 10:15:21 +07:00
|
|
|
if (unlikely(inode_unhashed(inode))) {
|
|
|
|
iput(inode);
|
|
|
|
goto again;
|
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
inode = alloc_inode(sb);
|
|
|
|
if (inode) {
|
2009-03-31 21:05:54 +07:00
|
|
|
struct inode *old;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
/* We released the lock, so.. */
|
|
|
|
old = find_inode_fast(sb, head, ino);
|
|
|
|
if (!old) {
|
|
|
|
inode->i_ino = ino;
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
inode->i_state = I_NEW;
|
2010-10-23 18:15:32 +07:00
|
|
|
hlist_add_head(&inode->i_hash, head);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:40 +07:00
|
|
|
inode_sb_list_add(inode);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
/* Return the locked inode with I_NEW set, the
|
|
|
|
* caller is responsible for filling in the contents
|
|
|
|
*/
|
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Uhhuh, somebody else created the same inode under
|
|
|
|
* us. Use the old inode instead of the one we just
|
|
|
|
* allocated.
|
|
|
|
*/
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
destroy_inode(inode);
|
2018-06-29 02:53:17 +07:00
|
|
|
if (IS_ERR(old))
|
|
|
|
return NULL;
|
2005-04-17 05:20:36 +07:00
|
|
|
inode = old;
|
|
|
|
wait_on_inode(inode);
|
2016-07-04 10:15:21 +07:00
|
|
|
if (unlikely(inode_unhashed(inode))) {
|
|
|
|
iput(inode);
|
|
|
|
goto again;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
return inode;
|
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
EXPORT_SYMBOL(iget_locked);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2010-10-23 18:00:16 +07:00
|
|
|
/*
|
|
|
|
* search the inode cache for a matching inode number.
|
|
|
|
* If we find one, then the inode number we are trying to
|
|
|
|
* allocate is not unique and so we should not use it.
|
|
|
|
*
|
|
|
|
* Returns 1 if the inode number is unique, 0 if it is not.
|
|
|
|
*/
|
|
|
|
static int test_inode_iunique(struct super_block *sb, unsigned long ino)
|
|
|
|
{
|
|
|
|
struct hlist_head *b = inode_hashtable + hash(sb, ino);
|
|
|
|
struct inode *inode;
|
|
|
|
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 08:06:00 +07:00
|
|
|
hlist_for_each_entry(inode, b, i_hash) {
|
2011-03-22 18:23:42 +07:00
|
|
|
if (inode->i_ino == ino && inode->i_sb == sb) {
|
|
|
|
spin_unlock(&inode_hash_lock);
|
2010-10-23 18:00:16 +07:00
|
|
|
return 0;
|
2011-03-22 18:23:42 +07:00
|
|
|
}
|
2010-10-23 18:00:16 +07:00
|
|
|
}
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2010-10-23 18:00:16 +07:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/**
|
|
|
|
* iunique - get a unique inode number
|
|
|
|
* @sb: superblock
|
|
|
|
* @max_reserved: highest reserved inode number
|
|
|
|
*
|
|
|
|
* Obtain an inode number that is unique on the system for a given
|
|
|
|
* superblock. This is used by file systems that have no natural
|
|
|
|
* permanent inode numbering system. An inode number is returned that
|
|
|
|
* is higher than the reserved limit but unique.
|
|
|
|
*
|
|
|
|
* BUGS:
|
|
|
|
* With a large number of inodes live on the file system this function
|
|
|
|
* currently becomes quite slow.
|
|
|
|
*/
|
|
|
|
ino_t iunique(struct super_block *sb, ino_t max_reserved)
|
|
|
|
{
|
inode numbering: make static counters in new_inode and iunique be 32 bits
The problems are:
- on filesystems w/o permanent inode numbers, i_ino values can be larger
than 32 bits, which can cause problems for some 32 bit userspace programs on
a 64 bit kernel. We can't do anything for filesystems that have actual
>32-bit inode numbers, but on filesystems that generate i_ino values on the
fly, we should try to have them fit in 32 bits. We could trivially fix this
by making the static counters in new_inode and iunique 32 bits, but...
- many filesystems call new_inode and assume that the i_ino values they are
given are unique. They are not guaranteed to be so, since the static
counter can wrap. This problem is exacerbated by the fix for #1.
- after allocating a new inode, some filesystems call iunique to try to get
a unique i_ino value, but they don't actually add their inodes to the
hashtable, and so they're still not guaranteed to be unique if that counter
wraps.
This patch set takes the simpler approach of simply using iunique and hashing
the inodes afterward. Christoph H. previously mentioned that he thought that
this approach may slow down lookups for filesystems that currently hash their
inodes.
The questions are:
1) how much would this slow down lookups for these filesystems?
2) is it enough to justify adding more infrastructure to avoid it?
What might be best is to start with this approach and then only move to using
IDR or some other scheme if these extra inodes in the hashtable prove to be
problematic.
I've done some cursory testing with this patch and the overhead of hashing and
unhashing the inodes with pipefs is pretty low -- just a few seconds of system
time added on to the creation and destruction of 10 million pipes (very
similar to the overhead that the IDR approach would add).
The hard thing to measure is what effect this has on other filesystems. I'm
open to ways to try and gauge this.
Again, I've only converted pipefs as an example. If this approach is
acceptable then I'll start work on patches to convert other filesystems.
With a pretty-much-worst-case microbenchmark provided by Eric Dumazet
<dada1@cosmosbay.com>:
hashing patch (pipebench):
sys 1m15.329s
sys 1m16.249s
sys 1m17.169s
unpatched (pipebench):
sys 1m9.836s
sys 1m12.541s
sys 1m14.153s
Which works out to 1.05642174294555027017. So ~5-6% slowdown.
This patch:
When a 32-bit program that was not compiled with large file offsets does a
stat and gets a st_ino value back that won't fit in the 32 bit field, glibc
(correctly) generates an EOVERFLOW error. We can't do anything about fs's
with larger permanent inode numbers, but when we generate them on the fly, we
ought to try and have them fit within a 32 bit field.
This patch takes the first step toward this by making the static counters in
these two functions be 32 bits.
[jlayton@redhat.com: mention that it's only the case for 32bit, non-LFS stat]
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-08 14:32:29 +07:00
|
|
|
/*
|
|
|
|
* On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW
|
|
|
|
* error if st_ino won't fit in target struct field. Use 32bit counter
|
|
|
|
* here to attempt to avoid that.
|
|
|
|
*/
|
2010-10-23 18:00:16 +07:00
|
|
|
static DEFINE_SPINLOCK(iunique_lock);
|
inode numbering: make static counters in new_inode and iunique be 32 bits
The problems are:
- on filesystems w/o permanent inode numbers, i_ino values can be larger
than 32 bits, which can cause problems for some 32 bit userspace programs on
a 64 bit kernel. We can't do anything for filesystems that have actual
>32-bit inode numbers, but on filesystems that generate i_ino values on the
fly, we should try to have them fit in 32 bits. We could trivially fix this
by making the static counters in new_inode and iunique 32 bits, but...
- many filesystems call new_inode and assume that the i_ino values they are
given are unique. They are not guaranteed to be so, since the static
counter can wrap. This problem is exacerbated by the fix for #1.
- after allocating a new inode, some filesystems call iunique to try to get
a unique i_ino value, but they don't actually add their inodes to the
hashtable, and so they're still not guaranteed to be unique if that counter
wraps.
This patch set takes the simpler approach of simply using iunique and hashing
the inodes afterward. Christoph H. previously mentioned that he thought that
this approach may slow down lookups for filesystems that currently hash their
inodes.
The questions are:
1) how much would this slow down lookups for these filesystems?
2) is it enough to justify adding more infrastructure to avoid it?
What might be best is to start with this approach and then only move to using
IDR or some other scheme if these extra inodes in the hashtable prove to be
problematic.
I've done some cursory testing with this patch and the overhead of hashing and
unhashing the inodes with pipefs is pretty low -- just a few seconds of system
time added on to the creation and destruction of 10 million pipes (very
similar to the overhead that the IDR approach would add).
The hard thing to measure is what effect this has on other filesystems. I'm
open to ways to try and gauge this.
Again, I've only converted pipefs as an example. If this approach is
acceptable then I'll start work on patches to convert other filesystems.
With a pretty-much-worst-case microbenchmark provided by Eric Dumazet
<dada1@cosmosbay.com>:
hashing patch (pipebench):
sys 1m15.329s
sys 1m16.249s
sys 1m17.169s
unpatched (pipebench):
sys 1m9.836s
sys 1m12.541s
sys 1m14.153s
Which works out to 1.05642174294555027017. So ~5-6% slowdown.
This patch:
When a 32-bit program that was not compiled with large file offsets does a
stat and gets a st_ino value back that won't fit in the 32 bit field, glibc
(correctly) generates an EOVERFLOW error. We can't do anything about fs's
with larger permanent inode numbers, but when we generate them on the fly, we
ought to try and have them fit within a 32 bit field.
This patch takes the first step toward this by making the static counters in
these two functions be 32 bits.
[jlayton@redhat.com: mention that it's only the case for 32bit, non-LFS stat]
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-08 14:32:29 +07:00
|
|
|
static unsigned int counter;
|
2005-04-17 05:20:36 +07:00
|
|
|
ino_t res;
|
2007-05-08 14:29:48 +07:00
|
|
|
|
2010-10-23 18:00:16 +07:00
|
|
|
spin_lock(&iunique_lock);
|
2007-05-08 14:29:48 +07:00
|
|
|
do {
|
|
|
|
if (counter <= max_reserved)
|
|
|
|
counter = max_reserved + 1;
|
2005-04-17 05:20:36 +07:00
|
|
|
res = counter++;
|
2010-10-23 18:00:16 +07:00
|
|
|
} while (!test_inode_iunique(sb, res));
|
|
|
|
spin_unlock(&iunique_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2007-05-08 14:29:48 +07:00
|
|
|
return res;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
EXPORT_SYMBOL(iunique);
|
|
|
|
|
|
|
|
struct inode *igrab(struct inode *inode)
|
|
|
|
{
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) {
|
2005-04-17 05:20:36 +07:00
|
|
|
__iget(inode);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
} else {
|
|
|
|
spin_unlock(&inode->i_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* Handle the case where s_op->clear_inode is not been
|
|
|
|
* called yet, and somebody is calling igrab
|
|
|
|
* while the inode is getting freed.
|
|
|
|
*/
|
|
|
|
inode = NULL;
|
2011-03-22 18:23:36 +07:00
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(igrab);
|
|
|
|
|
|
|
|
/**
|
2011-03-24 02:03:28 +07:00
|
|
|
* ilookup5_nowait - search for an inode in the inode cache
|
2005-04-17 05:20:36 +07:00
|
|
|
* @sb: super block of file system to search
|
2011-03-24 02:03:28 +07:00
|
|
|
* @hashval: hash value (usually inode number) to search for
|
2005-04-17 05:20:36 +07:00
|
|
|
* @test: callback used for comparisons between inodes
|
|
|
|
* @data: opaque data pointer to pass to @test
|
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Search for the inode specified by @hashval and @data in the inode cache.
|
2005-04-17 05:20:36 +07:00
|
|
|
* If the inode is in the cache, the inode is returned with an incremented
|
|
|
|
* reference count.
|
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Note: I_NEW is not waited upon so you have to be very careful what you do
|
|
|
|
* with the returned inode. You probably should be using ilookup5() instead.
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2011-03-27 03:27:47 +07:00
|
|
|
* Note2: @test is called with the inode_hash_lock held, so can't sleep.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
2011-03-24 02:03:28 +07:00
|
|
|
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval,
|
|
|
|
int (*test)(struct inode *, void *), void *data)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2011-03-24 02:03:28 +07:00
|
|
|
struct hlist_head *head = inode_hashtable + hash(sb, hashval);
|
2005-04-17 05:20:36 +07:00
|
|
|
struct inode *inode;
|
|
|
|
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
inode = find_inode(sb, head, test, data);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2005-07-13 15:10:44 +07:00
|
|
|
|
2018-06-29 02:53:17 +07:00
|
|
|
return IS_ERR(inode) ? NULL : inode;
|
2005-07-13 15:10:44 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(ilookup5_nowait);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ilookup5 - search for an inode in the inode cache
|
|
|
|
* @sb: super block of file system to search
|
|
|
|
* @hashval: hash value (usually inode number) to search for
|
|
|
|
* @test: callback used for comparisons between inodes
|
|
|
|
* @data: opaque data pointer to pass to @test
|
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Search for the inode specified by @hashval and @data in the inode cache,
|
|
|
|
* and if the inode is in the cache, return the inode with an incremented
|
|
|
|
* reference count. Waits on I_NEW before returning the inode.
|
2005-07-13 15:10:44 +07:00
|
|
|
* returned with an incremented reference count.
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* This is a generalized version of ilookup() for file systems where the
|
|
|
|
* inode number is not sufficient for unique identification of an inode.
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Note: @test is called with the inode_hash_lock held, so can't sleep.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
|
|
|
|
int (*test)(struct inode *, void *), void *data)
|
|
|
|
{
|
2016-07-04 10:15:21 +07:00
|
|
|
struct inode *inode;
|
|
|
|
again:
|
|
|
|
inode = ilookup5_nowait(sb, hashval, test, data);
|
|
|
|
if (inode) {
|
2011-03-24 02:03:28 +07:00
|
|
|
wait_on_inode(inode);
|
2016-07-04 10:15:21 +07:00
|
|
|
if (unlikely(inode_unhashed(inode))) {
|
|
|
|
iput(inode);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
return inode;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(ilookup5);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ilookup - search for an inode in the inode cache
|
|
|
|
* @sb: super block of file system to search
|
|
|
|
* @ino: inode number to search for
|
|
|
|
*
|
2011-03-24 02:03:28 +07:00
|
|
|
* Search for the inode @ino in the inode cache, and if the inode is in the
|
|
|
|
* cache, the inode is returned with an incremented reference count.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
struct inode *ilookup(struct super_block *sb, unsigned long ino)
|
|
|
|
{
|
|
|
|
struct hlist_head *head = inode_hashtable + hash(sb, ino);
|
|
|
|
struct inode *inode;
|
2016-07-04 10:15:21 +07:00
|
|
|
again:
|
2011-03-24 02:03:28 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
|
|
|
inode = find_inode_fast(sb, head, ino);
|
|
|
|
spin_unlock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2016-07-04 10:15:21 +07:00
|
|
|
if (inode) {
|
2018-06-29 02:53:17 +07:00
|
|
|
if (IS_ERR(inode))
|
|
|
|
return NULL;
|
2011-03-24 02:03:28 +07:00
|
|
|
wait_on_inode(inode);
|
2016-07-04 10:15:21 +07:00
|
|
|
if (unlikely(inode_unhashed(inode))) {
|
|
|
|
iput(inode);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
return inode;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2011-03-24 02:03:28 +07:00
|
|
|
EXPORT_SYMBOL(ilookup);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-02-02 12:37:01 +07:00
|
|
|
/**
|
|
|
|
* find_inode_nowait - find an inode in the inode cache
|
|
|
|
* @sb: super block of file system to search
|
|
|
|
* @hashval: hash value (usually inode number) to search for
|
|
|
|
* @match: callback used for comparisons between inodes
|
|
|
|
* @data: opaque data pointer to pass to @match
|
|
|
|
*
|
|
|
|
* Search for the inode specified by @hashval and @data in the inode
|
|
|
|
* cache, where the helper function @match will return 0 if the inode
|
|
|
|
* does not match, 1 if the inode does match, and -1 if the search
|
|
|
|
* should be stopped. The @match function must be responsible for
|
|
|
|
* taking the i_lock spin_lock and checking i_state for an inode being
|
|
|
|
* freed or being initialized, and incrementing the reference count
|
|
|
|
* before returning 1. It also must not sleep, since it is called with
|
|
|
|
* the inode_hash_lock spinlock held.
|
|
|
|
*
|
|
|
|
* This is a even more generalized version of ilookup5() when the
|
|
|
|
* function must never block --- find_inode() can block in
|
|
|
|
* __wait_on_freeing_inode() --- or when the caller can not increment
|
|
|
|
* the reference count because the resulting iput() might cause an
|
|
|
|
* inode eviction. The tradeoff is that the @match funtion must be
|
|
|
|
* very carefully implemented.
|
|
|
|
*/
|
|
|
|
struct inode *find_inode_nowait(struct super_block *sb,
|
|
|
|
unsigned long hashval,
|
|
|
|
int (*match)(struct inode *, unsigned long,
|
|
|
|
void *),
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct hlist_head *head = inode_hashtable + hash(sb, hashval);
|
|
|
|
struct inode *inode, *ret_inode = NULL;
|
|
|
|
int mval;
|
|
|
|
|
|
|
|
spin_lock(&inode_hash_lock);
|
|
|
|
hlist_for_each_entry(inode, head, i_hash) {
|
|
|
|
if (inode->i_sb != sb)
|
|
|
|
continue;
|
|
|
|
mval = match(inode, hashval, data);
|
|
|
|
if (mval == 0)
|
|
|
|
continue;
|
|
|
|
if (mval == 1)
|
|
|
|
ret_inode = inode;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
spin_unlock(&inode_hash_lock);
|
|
|
|
return ret_inode;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(find_inode_nowait);
|
|
|
|
|
2008-12-30 13:48:21 +07:00
|
|
|
int insert_inode_locked(struct inode *inode)
|
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
ino_t ino = inode->i_ino;
|
|
|
|
struct hlist_head *head = inode_hashtable + hash(sb, ino);
|
|
|
|
|
|
|
|
while (1) {
|
2009-05-14 01:13:40 +07:00
|
|
|
struct inode *old = NULL;
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 08:06:00 +07:00
|
|
|
hlist_for_each_entry(old, head, i_hash) {
|
2009-05-14 01:13:40 +07:00
|
|
|
if (old->i_ino != ino)
|
|
|
|
continue;
|
|
|
|
if (old->i_sb != sb)
|
|
|
|
continue;
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&old->i_lock);
|
|
|
|
if (old->i_state & (I_FREEING|I_WILL_FREE)) {
|
|
|
|
spin_unlock(&old->i_lock);
|
2009-05-14 01:13:40 +07:00
|
|
|
continue;
|
2011-03-22 18:23:36 +07:00
|
|
|
}
|
2009-05-14 01:13:40 +07:00
|
|
|
break;
|
|
|
|
}
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 08:06:00 +07:00
|
|
|
if (likely(!old)) {
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
2018-06-29 02:53:17 +07:00
|
|
|
inode->i_state |= I_NEW | I_CREATING;
|
2008-12-30 13:48:21 +07:00
|
|
|
hlist_add_head(&inode->i_hash, head);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2008-12-30 13:48:21 +07:00
|
|
|
return 0;
|
|
|
|
}
|
2018-06-29 02:53:17 +07:00
|
|
|
if (unlikely(old->i_state & I_CREATING)) {
|
|
|
|
spin_unlock(&old->i_lock);
|
|
|
|
spin_unlock(&inode_hash_lock);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
2008-12-30 13:48:21 +07:00
|
|
|
__iget(old);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&old->i_lock);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2008-12-30 13:48:21 +07:00
|
|
|
wait_on_inode(old);
|
2010-10-24 02:19:20 +07:00
|
|
|
if (unlikely(!inode_unhashed(old))) {
|
2008-12-30 13:48:21 +07:00
|
|
|
iput(old);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
iput(old);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(insert_inode_locked);
|
|
|
|
|
|
|
|
int insert_inode_locked4(struct inode *inode, unsigned long hashval,
|
|
|
|
int (*test)(struct inode *, void *), void *data)
|
|
|
|
{
|
2018-06-29 02:53:17 +07:00
|
|
|
struct inode *old;
|
|
|
|
|
|
|
|
inode->i_state |= I_CREATING;
|
|
|
|
old = inode_insert5(inode, hashval, test, NULL, data);
|
2008-12-30 13:48:21 +07:00
|
|
|
|
2018-05-17 15:53:05 +07:00
|
|
|
if (old != inode) {
|
2008-12-30 13:48:21 +07:00
|
|
|
iput(old);
|
2018-05-17 15:53:05 +07:00
|
|
|
return -EBUSY;
|
2008-12-30 13:48:21 +07:00
|
|
|
}
|
2018-05-17 15:53:05 +07:00
|
|
|
return 0;
|
2008-12-30 13:48:21 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(insert_inode_locked4);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2010-06-08 00:43:19 +07:00
|
|
|
int generic_delete_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(generic_delete_inode);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called when we're dropping the last reference
|
|
|
|
* to an inode.
|
2009-09-19 03:05:44 +07:00
|
|
|
*
|
2010-06-08 00:43:19 +07:00
|
|
|
* Call the FS "drop_inode()" function, defaulting to
|
|
|
|
* the legacy UNIX filesystem behaviour. If it tells
|
|
|
|
* us to evict inode, do so. Otherwise, retain inode
|
|
|
|
* in cache if fs is alive, sync and evict if fs is
|
|
|
|
* shutting down.
|
2009-09-19 03:05:44 +07:00
|
|
|
*/
|
2010-06-08 00:43:19 +07:00
|
|
|
static void iput_final(struct inode *inode)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
2010-06-08 00:43:19 +07:00
|
|
|
const struct super_operations *op = inode->i_sb->s_op;
|
|
|
|
int drop;
|
|
|
|
|
2011-03-22 18:23:36 +07:00
|
|
|
WARN_ON(inode->i_state & I_NEW);
|
|
|
|
|
2011-07-08 02:45:59 +07:00
|
|
|
if (op->drop_inode)
|
2010-06-08 00:43:19 +07:00
|
|
|
drop = op->drop_inode(inode);
|
|
|
|
else
|
|
|
|
drop = generic_drop_inode(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2017-11-28 04:05:09 +07:00
|
|
|
if (!drop && (sb->s_flags & SB_ACTIVE)) {
|
2012-11-27 07:29:51 +07:00
|
|
|
inode_add_lru(inode);
|
2011-03-22 18:23:37 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2010-06-08 00:43:19 +07:00
|
|
|
if (!drop) {
|
2005-06-23 14:09:01 +07:00
|
|
|
inode->i_state |= I_WILL_FREE;
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
write_inode_now(inode, 1);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_lock(&inode->i_lock);
|
fs: new inode i_state corruption fix
There was a report of a data corruption
http://lkml.org/lkml/2008/11/14/121. There is a script included to
reproduce the problem.
During testing, I encountered a number of strange things with ext3, so I
tried ext2 to attempt to reduce complexity of the problem. I found that
fsstress would quickly hang in wait_on_inode, waiting for I_LOCK to be
cleared, even though instrumentation showed that unlock_new_inode had
already been called for that inode. This points to memory scribble, or
synchronisation problme.
i_state of I_NEW inodes is not protected by inode_lock because other
processes are not supposed to touch them until I_LOCK (and I_NEW) is
cleared. Adding WARN_ON(inode->i_state & I_NEW) to sites where we modify
i_state revealed that generic_sync_sb_inodes is picking up new inodes from
the inode lists and passing them to __writeback_single_inode without
waiting for I_NEW. Subsequently modifying i_state causes corruption. In
my case it would look like this:
CPU0 CPU1
unlock_new_inode() __sync_single_inode()
reg <- inode->i_state
reg -> reg & ~(I_LOCK|I_NEW) reg <- inode->i_state
reg -> inode->i_state reg -> reg | I_SYNC
reg -> inode->i_state
Non-atomic RMW on CPU1 overwrites CPU0 store and sets I_LOCK|I_NEW again.
Fix for this is rather than wait for I_NEW inodes, just skip over them:
inodes concurrently being created are not subject to data integrity
operations, and should not significantly contribute to dirty memory
either.
After this change, I'm unable to reproduce any of the added warnings or
hangs after ~1hour of running. Previously, the new warnings would start
immediately and hang would happen in under 5 minutes.
I'm also testing on ext3 now, and so far no problems there either. I
don't know whether this fixes the problem reported above, but it fixes a
real problem for me.
Cc: "Jorge Boncompte [DTI2]" <jorge@dti2.net>
Reported-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: <stable@kernel.org>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-13 04:31:38 +07:00
|
|
|
WARN_ON(inode->i_state & I_NEW);
|
2005-06-23 14:09:01 +07:00
|
|
|
inode->i_state &= ~I_WILL_FREE;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2010-10-21 07:49:30 +07:00
|
|
|
|
2005-06-23 14:09:01 +07:00
|
|
|
inode->i_state |= I_FREEING;
|
2011-07-28 11:55:13 +07:00
|
|
|
if (!list_empty(&inode->i_lru))
|
|
|
|
inode_lru_list_del(inode);
|
2011-03-22 18:23:37 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
|
2010-06-08 00:21:05 +07:00
|
|
|
evict(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2009-03-31 21:05:54 +07:00
|
|
|
* iput - put an inode
|
2005-04-17 05:20:36 +07:00
|
|
|
* @inode: inode to put
|
|
|
|
*
|
|
|
|
* Puts an inode, dropping its usage count. If the inode use count hits
|
|
|
|
* zero, the inode is then freed and may also be destroyed.
|
|
|
|
*
|
|
|
|
* Consequently, iput() can sleep.
|
|
|
|
*/
|
|
|
|
void iput(struct inode *inode)
|
|
|
|
{
|
2015-02-02 12:37:00 +07:00
|
|
|
if (!inode)
|
|
|
|
return;
|
|
|
|
BUG_ON(inode->i_state & I_CLEAR);
|
|
|
|
retry:
|
|
|
|
if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) {
|
|
|
|
if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) {
|
|
|
|
atomic_inc(&inode->i_count);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
trace_writeback_lazytime_iput(inode);
|
|
|
|
mark_inode_dirty_sync(inode);
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
iput_final(inode);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(iput);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* bmap - find a block number in a file
|
|
|
|
* @inode: inode of file
|
|
|
|
* @block: block to find
|
|
|
|
*
|
|
|
|
* Returns the block number on the device holding the inode that
|
|
|
|
* is the disk block number for the block of the file requested.
|
|
|
|
* That is, asked for block 4 of inode 1 the function will return the
|
2009-03-31 21:05:54 +07:00
|
|
|
* disk block relative to the disk start that holds that block of the
|
2005-04-17 05:20:36 +07:00
|
|
|
* file.
|
|
|
|
*/
|
2009-03-31 21:05:54 +07:00
|
|
|
sector_t bmap(struct inode *inode, sector_t block)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
|
|
|
sector_t res = 0;
|
|
|
|
if (inode->i_mapping->a_ops->bmap)
|
|
|
|
res = inode->i_mapping->a_ops->bmap(inode->i_mapping, block);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(bmap);
|
|
|
|
|
2009-03-27 00:32:14 +07:00
|
|
|
/*
|
|
|
|
* With relative atime, only update atime if the previous atime is
|
|
|
|
* earlier than either the ctime or mtime or if at least a day has
|
|
|
|
* passed since the last atime update.
|
|
|
|
*/
|
2018-07-18 20:44:43 +07:00
|
|
|
static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
|
2019-04-26 21:50:41 +07:00
|
|
|
struct timespec64 now)
|
2009-03-27 00:32:14 +07:00
|
|
|
{
|
|
|
|
|
2018-07-18 20:44:43 +07:00
|
|
|
if (!(mnt->mnt_flags & MNT_RELATIME))
|
2009-03-27 00:32:14 +07:00
|
|
|
return 1;
|
|
|
|
/*
|
|
|
|
* Is mtime younger than atime? If yes, update atime:
|
|
|
|
*/
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
if (timespec64_compare(&inode->i_mtime, &inode->i_atime) >= 0)
|
2009-03-27 00:32:14 +07:00
|
|
|
return 1;
|
|
|
|
/*
|
|
|
|
* Is ctime younger than atime? If yes, update atime:
|
|
|
|
*/
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
if (timespec64_compare(&inode->i_ctime, &inode->i_atime) >= 0)
|
2009-03-27 00:32:14 +07:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Is the previous atime value older than a day? If yes,
|
|
|
|
* update atime:
|
|
|
|
*/
|
|
|
|
if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60)
|
|
|
|
return 1;
|
|
|
|
/*
|
|
|
|
* Good, we can skip the atime update:
|
|
|
|
*/
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
int generic_update_time(struct inode *inode, struct timespec64 *time, int flags)
|
2012-03-26 20:59:21 +07:00
|
|
|
{
|
2015-02-02 12:37:00 +07:00
|
|
|
int iflags = I_DIRTY_TIME;
|
2017-12-11 18:35:22 +07:00
|
|
|
bool dirty = false;
|
2012-03-26 20:59:21 +07:00
|
|
|
|
|
|
|
if (flags & S_ATIME)
|
|
|
|
inode->i_atime = *time;
|
|
|
|
if (flags & S_VERSION)
|
2017-12-11 18:35:22 +07:00
|
|
|
dirty = inode_maybe_inc_iversion(inode, false);
|
2012-03-26 20:59:21 +07:00
|
|
|
if (flags & S_CTIME)
|
|
|
|
inode->i_ctime = *time;
|
|
|
|
if (flags & S_MTIME)
|
|
|
|
inode->i_mtime = *time;
|
2017-12-11 18:35:22 +07:00
|
|
|
if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
|
|
|
|
!(inode->i_sb->s_flags & SB_LAZYTIME))
|
|
|
|
dirty = true;
|
2015-02-02 12:37:00 +07:00
|
|
|
|
2017-12-11 18:35:22 +07:00
|
|
|
if (dirty)
|
2015-02-02 12:37:00 +07:00
|
|
|
iflags |= I_DIRTY_SYNC;
|
|
|
|
__mark_inode_dirty(inode, iflags);
|
2012-03-26 20:59:21 +07:00
|
|
|
return 0;
|
|
|
|
}
|
2015-02-02 12:37:00 +07:00
|
|
|
EXPORT_SYMBOL(generic_update_time);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This does the actual work of updating an inodes time or version. Must have
|
|
|
|
* had called mnt_want_write() before calling this.
|
|
|
|
*/
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
static int update_time(struct inode *inode, struct timespec64 *time, int flags)
|
2015-02-02 12:37:00 +07:00
|
|
|
{
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
int (*update_time)(struct inode *, struct timespec64 *, int);
|
2015-02-02 12:37:00 +07:00
|
|
|
|
|
|
|
update_time = inode->i_op->update_time ? inode->i_op->update_time :
|
|
|
|
generic_update_time;
|
|
|
|
|
|
|
|
return update_time(inode, time, flags);
|
|
|
|
}
|
2012-03-26 20:59:21 +07:00
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/**
|
2006-01-10 11:52:03 +07:00
|
|
|
* touch_atime - update the access time
|
2012-04-18 07:03:25 +07:00
|
|
|
* @path: the &struct path to update
|
2015-11-10 05:57:58 +07:00
|
|
|
* @inode: inode to update
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
|
|
|
* Update the accessed time on an inode and mark it for writeback.
|
|
|
|
* This function automatically handles read only file systems and media,
|
|
|
|
* as well as the "noatime" flag and inode specific "noatime" markers.
|
|
|
|
*/
|
2018-07-18 20:44:43 +07:00
|
|
|
bool atime_needs_update(const struct path *path, struct inode *inode)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2012-03-15 19:21:57 +07:00
|
|
|
struct vfsmount *mnt = path->mnt;
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
struct timespec64 now;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2008-02-16 05:37:41 +07:00
|
|
|
if (inode->i_flags & S_NOATIME)
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2016-06-30 02:54:46 +07:00
|
|
|
|
|
|
|
/* Atime updates will likely cause i_uid and i_gid to be written
|
|
|
|
* back improprely if their true value is unknown to the vfs.
|
|
|
|
*/
|
|
|
|
if (HAS_UNMAPPED_ID(inode))
|
|
|
|
return false;
|
|
|
|
|
2007-02-10 16:44:49 +07:00
|
|
|
if (IS_NOATIME(inode))
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2017-11-28 04:05:09 +07:00
|
|
|
if ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode))
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2006-12-13 15:34:34 +07:00
|
|
|
|
2008-02-16 05:37:41 +07:00
|
|
|
if (mnt->mnt_flags & MNT_NOATIME)
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2008-02-16 05:37:41 +07:00
|
|
|
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2016-09-14 21:48:06 +07:00
|
|
|
now = current_time(inode);
|
2009-03-27 00:32:14 +07:00
|
|
|
|
2019-04-26 21:50:41 +07:00
|
|
|
if (!relatime_need_update(mnt, inode, now))
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
2009-03-27 00:32:14 +07:00
|
|
|
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
if (timespec64_equal(&inode->i_atime, &now))
|
2015-03-23 09:37:40 +07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
void touch_atime(const struct path *path)
|
|
|
|
{
|
|
|
|
struct vfsmount *mnt = path->mnt;
|
|
|
|
struct inode *inode = d_inode(path->dentry);
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
struct timespec64 now;
|
2015-03-23 09:37:40 +07:00
|
|
|
|
2018-07-18 20:44:43 +07:00
|
|
|
if (!atime_needs_update(path, inode))
|
2009-09-19 03:05:47 +07:00
|
|
|
return;
|
|
|
|
|
2012-06-12 21:20:36 +07:00
|
|
|
if (!sb_start_write_trylock(inode->i_sb))
|
2009-09-19 03:05:47 +07:00
|
|
|
return;
|
2006-12-13 15:34:34 +07:00
|
|
|
|
2015-03-23 09:37:40 +07:00
|
|
|
if (__mnt_want_write(mnt) != 0)
|
2012-06-12 21:20:36 +07:00
|
|
|
goto skip_update;
|
2012-03-26 20:59:21 +07:00
|
|
|
/*
|
|
|
|
* File systems can error out when updating inodes if they need to
|
|
|
|
* allocate new space to modify an inode (such is the case for
|
|
|
|
* Btrfs), but since we touch atime while walking down the path we
|
|
|
|
* really don't care if we failed to update the atime of the file,
|
|
|
|
* so just ignore the return value.
|
2012-06-15 14:49:33 +07:00
|
|
|
* We may also fail on filesystems that have the ability to make parts
|
|
|
|
* of the fs read only, e.g. subvolumes in Btrfs.
|
2012-03-26 20:59:21 +07:00
|
|
|
*/
|
2016-09-14 21:48:06 +07:00
|
|
|
now = current_time(inode);
|
2012-03-26 20:59:21 +07:00
|
|
|
update_time(inode, &now, S_ATIME);
|
2012-06-12 21:20:36 +07:00
|
|
|
__mnt_drop_write(mnt);
|
|
|
|
skip_update:
|
|
|
|
sb_end_write(inode->i_sb);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2006-01-10 11:52:03 +07:00
|
|
|
EXPORT_SYMBOL(touch_atime);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2012-05-15 13:57:33 +07:00
|
|
|
/*
|
|
|
|
* The logic we want is
|
|
|
|
*
|
|
|
|
* if suid or (sgid and xgrp)
|
|
|
|
* remove privs
|
|
|
|
*/
|
|
|
|
int should_remove_suid(struct dentry *dentry)
|
|
|
|
{
|
2015-03-18 05:26:15 +07:00
|
|
|
umode_t mode = d_inode(dentry)->i_mode;
|
2012-05-15 13:57:33 +07:00
|
|
|
int kill = 0;
|
|
|
|
|
|
|
|
/* suid always must be killed */
|
|
|
|
if (unlikely(mode & S_ISUID))
|
|
|
|
kill = ATTR_KILL_SUID;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* sgid without any exec bits is just a mandatory locking mark; leave
|
|
|
|
* it alone. If some exec bits are set, it's a real sgid; kill it.
|
|
|
|
*/
|
|
|
|
if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
|
|
|
|
kill |= ATTR_KILL_SGID;
|
|
|
|
|
|
|
|
if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
|
|
|
|
return kill;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(should_remove_suid);
|
|
|
|
|
2015-05-21 21:05:54 +07:00
|
|
|
/*
|
|
|
|
* Return mask of changes for notify_change() that need to be done as a
|
|
|
|
* response to write or truncate. Return 0 if nothing has to be changed.
|
|
|
|
* Negative value on error (change should be denied).
|
|
|
|
*/
|
2015-05-21 21:05:55 +07:00
|
|
|
int dentry_needs_remove_privs(struct dentry *dentry)
|
2015-05-21 21:05:54 +07:00
|
|
|
{
|
|
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
int mask = 0;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (IS_NOSEC(inode))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
mask = should_remove_suid(dentry);
|
|
|
|
ret = security_inode_need_killpriv(dentry);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
if (ret)
|
|
|
|
mask |= ATTR_KILL_PRIV;
|
|
|
|
return mask;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __remove_privs(struct dentry *dentry, int kill)
|
2012-05-15 13:57:33 +07:00
|
|
|
{
|
|
|
|
struct iattr newattrs;
|
|
|
|
|
|
|
|
newattrs.ia_valid = ATTR_FORCE | kill;
|
2011-09-21 04:19:26 +07:00
|
|
|
/*
|
|
|
|
* Note we call this on write, so notify_change will not
|
|
|
|
* encounter any conflicting delegations:
|
|
|
|
*/
|
|
|
|
return notify_change(dentry, &newattrs, NULL);
|
2012-05-15 13:57:33 +07:00
|
|
|
}
|
|
|
|
|
2015-05-21 21:05:53 +07:00
|
|
|
/*
|
|
|
|
* Remove special file priviledges (suid, capabilities) when file is written
|
|
|
|
* to or truncated.
|
|
|
|
*/
|
|
|
|
int file_remove_privs(struct file *file)
|
2012-05-15 13:57:33 +07:00
|
|
|
{
|
2016-08-03 18:44:27 +07:00
|
|
|
struct dentry *dentry = file_dentry(file);
|
|
|
|
struct inode *inode = file_inode(file);
|
2015-05-21 21:05:54 +07:00
|
|
|
int kill;
|
2012-05-15 13:57:33 +07:00
|
|
|
int error = 0;
|
|
|
|
|
2018-12-14 17:55:52 +07:00
|
|
|
/*
|
|
|
|
* Fast path for nothing security related.
|
|
|
|
* As well for non-regular files, e.g. blkdev inodes.
|
|
|
|
* For example, blkdev_write_iter() might get here
|
|
|
|
* trying to remove privs which it is not allowed to.
|
|
|
|
*/
|
|
|
|
if (IS_NOSEC(inode) || !S_ISREG(inode->i_mode))
|
2012-05-15 13:57:33 +07:00
|
|
|
return 0;
|
|
|
|
|
2016-08-03 18:44:27 +07:00
|
|
|
kill = dentry_needs_remove_privs(dentry);
|
2015-05-21 21:05:54 +07:00
|
|
|
if (kill < 0)
|
|
|
|
return kill;
|
|
|
|
if (kill)
|
|
|
|
error = __remove_privs(dentry, kill);
|
2015-05-21 21:05:52 +07:00
|
|
|
if (!error)
|
|
|
|
inode_has_no_xattr(inode);
|
2012-05-15 13:57:33 +07:00
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
2015-05-21 21:05:53 +07:00
|
|
|
EXPORT_SYMBOL(file_remove_privs);
|
2012-05-15 13:57:33 +07:00
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/**
|
2006-01-10 11:52:01 +07:00
|
|
|
* file_update_time - update mtime and ctime time
|
|
|
|
* @file: file accessed
|
2005-04-17 05:20:36 +07:00
|
|
|
*
|
2006-01-10 11:52:01 +07:00
|
|
|
* Update the mtime and ctime members of an inode and mark the inode
|
|
|
|
* for writeback. Note that this function is meant exclusively for
|
|
|
|
* usage in the file write path of filesystems, and filesystems may
|
|
|
|
* choose to explicitly ignore update via this function with the
|
2009-04-02 20:23:37 +07:00
|
|
|
* S_NOCMTIME inode flag, e.g. for network filesystem where these
|
2012-03-26 20:59:21 +07:00
|
|
|
* timestamps are handled by the server. This can return an error for
|
|
|
|
* file systems who need to allocate space in order to update an inode.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
|
2012-03-26 20:59:21 +07:00
|
|
|
int file_update_time(struct file *file)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2013-01-24 05:07:38 +07:00
|
|
|
struct inode *inode = file_inode(file);
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
struct timespec64 now;
|
2012-03-26 20:59:21 +07:00
|
|
|
int sync_it = 0;
|
|
|
|
int ret;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2009-09-19 03:05:48 +07:00
|
|
|
/* First try to exhaust all avenues to not sync */
|
2005-04-17 05:20:36 +07:00
|
|
|
if (IS_NOCMTIME(inode))
|
2012-03-26 20:59:21 +07:00
|
|
|
return 0;
|
2008-02-16 05:37:43 +07:00
|
|
|
|
2016-09-14 21:48:06 +07:00
|
|
|
now = current_time(inode);
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
if (!timespec64_equal(&inode->i_mtime, &now))
|
2009-09-19 03:05:48 +07:00
|
|
|
sync_it = S_MTIME;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
if (!timespec64_equal(&inode->i_ctime, &now))
|
2009-09-19 03:05:48 +07:00
|
|
|
sync_it |= S_CTIME;
|
2006-01-10 11:52:01 +07:00
|
|
|
|
2017-12-11 18:35:22 +07:00
|
|
|
if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode))
|
2009-09-19 03:05:48 +07:00
|
|
|
sync_it |= S_VERSION;
|
2008-01-29 11:58:27 +07:00
|
|
|
|
2009-09-19 03:05:48 +07:00
|
|
|
if (!sync_it)
|
2012-03-26 20:59:21 +07:00
|
|
|
return 0;
|
2009-09-19 03:05:48 +07:00
|
|
|
|
|
|
|
/* Finally allowed to write? Takes lock. */
|
2012-06-12 21:20:35 +07:00
|
|
|
if (__mnt_want_write_file(file))
|
2012-03-26 20:59:21 +07:00
|
|
|
return 0;
|
2009-09-19 03:05:48 +07:00
|
|
|
|
2012-03-26 20:59:21 +07:00
|
|
|
ret = update_time(inode, &now, sync_it);
|
2012-06-12 21:20:35 +07:00
|
|
|
__mnt_drop_write_file(file);
|
2012-03-26 20:59:21 +07:00
|
|
|
|
|
|
|
return ret;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2006-01-10 11:52:01 +07:00
|
|
|
EXPORT_SYMBOL(file_update_time);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2019-06-05 22:04:49 +07:00
|
|
|
/* Caller must hold the file's inode lock */
|
|
|
|
int file_modified(struct file *file)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear the security bits if the process is not being run by root.
|
|
|
|
* This keeps people from modifying setuid and setgid binaries.
|
|
|
|
*/
|
|
|
|
err = file_remove_privs(file);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
if (unlikely(file->f_mode & FMODE_NOCMTIME))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return file_update_time(file);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(file_modified);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
int inode_needs_sync(struct inode *inode)
|
|
|
|
{
|
|
|
|
if (IS_SYNC(inode))
|
|
|
|
return 1;
|
|
|
|
if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode))
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_needs_sync);
|
|
|
|
|
|
|
|
/*
|
2005-07-13 03:58:10 +07:00
|
|
|
* If we try to find an inode in the inode hash while it is being
|
|
|
|
* deleted, we have to wait until the filesystem completes its
|
|
|
|
* deletion before reporting that it isn't found. This function waits
|
|
|
|
* until the deletion _might_ have completed. Callers are responsible
|
|
|
|
* to recheck inode state.
|
|
|
|
*
|
2009-12-17 20:25:01 +07:00
|
|
|
* It doesn't matter if I_NEW is not set initially, a call to
|
2011-03-22 18:23:36 +07:00
|
|
|
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list
|
|
|
|
* will DTRT.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
static void __wait_on_freeing_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
wait_queue_head_t *wq;
|
2009-12-17 20:25:01 +07:00
|
|
|
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW);
|
|
|
|
wq = bit_waitqueue(&inode->i_state, __I_NEW);
|
2017-03-05 17:25:39 +07:00
|
|
|
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
|
2011-03-22 18:23:36 +07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_unlock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
schedule();
|
2017-03-05 17:25:39 +07:00
|
|
|
finish_wait(wq, &wait.wq_entry);
|
2011-03-22 18:23:42 +07:00
|
|
|
spin_lock(&inode_hash_lock);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static __initdata unsigned long ihash_entries;
|
|
|
|
static int __init set_ihash_entries(char *str)
|
|
|
|
{
|
|
|
|
if (!str)
|
|
|
|
return 0;
|
|
|
|
ihash_entries = simple_strtoul(str, &str, 0);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
__setup("ihash_entries=", set_ihash_entries);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize the waitqueues and inode hash table.
|
|
|
|
*/
|
|
|
|
void __init inode_init_early(void)
|
|
|
|
{
|
|
|
|
/* If hashes are distributed across NUMA nodes, defer
|
|
|
|
* hash allocation until vmalloc space is available.
|
|
|
|
*/
|
|
|
|
if (hashdist)
|
|
|
|
return;
|
|
|
|
|
|
|
|
inode_hashtable =
|
|
|
|
alloc_large_system_hash("Inode-cache",
|
|
|
|
sizeof(struct hlist_head),
|
|
|
|
ihash_entries,
|
|
|
|
14,
|
2017-07-07 05:39:11 +07:00
|
|
|
HASH_EARLY | HASH_ZERO,
|
2005-04-17 05:20:36 +07:00
|
|
|
&i_hash_shift,
|
|
|
|
&i_hash_mask,
|
2012-05-23 20:33:35 +07:00
|
|
|
0,
|
2005-04-17 05:20:36 +07:00
|
|
|
0);
|
|
|
|
}
|
|
|
|
|
2007-10-17 13:26:30 +07:00
|
|
|
void __init inode_init(void)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
|
|
|
/* inode slab cache */
|
2006-03-24 18:16:09 +07:00
|
|
|
inode_cachep = kmem_cache_create("inode_cache",
|
|
|
|
sizeof(struct inode),
|
|
|
|
0,
|
|
|
|
(SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
|
2016-01-15 06:18:21 +07:00
|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
2007-07-20 08:11:58 +07:00
|
|
|
init_once);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
/* Hash may have been set up in inode_init_early */
|
|
|
|
if (!hashdist)
|
|
|
|
return;
|
|
|
|
|
|
|
|
inode_hashtable =
|
|
|
|
alloc_large_system_hash("Inode-cache",
|
|
|
|
sizeof(struct hlist_head),
|
|
|
|
ihash_entries,
|
|
|
|
14,
|
2017-07-07 05:39:11 +07:00
|
|
|
HASH_ZERO,
|
2005-04-17 05:20:36 +07:00
|
|
|
&i_hash_shift,
|
|
|
|
&i_hash_mask,
|
2012-05-23 20:33:35 +07:00
|
|
|
0,
|
2005-04-17 05:20:36 +07:00
|
|
|
0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
|
|
|
|
{
|
|
|
|
inode->i_mode = mode;
|
|
|
|
if (S_ISCHR(mode)) {
|
|
|
|
inode->i_fop = &def_chr_fops;
|
|
|
|
inode->i_rdev = rdev;
|
|
|
|
} else if (S_ISBLK(mode)) {
|
|
|
|
inode->i_fop = &def_blk_fops;
|
|
|
|
inode->i_rdev = rdev;
|
|
|
|
} else if (S_ISFIFO(mode))
|
2013-03-12 20:58:10 +07:00
|
|
|
inode->i_fop = &pipefifo_fops;
|
2005-04-17 05:20:36 +07:00
|
|
|
else if (S_ISSOCK(mode))
|
2014-11-19 11:38:21 +07:00
|
|
|
; /* leave it no_open_fops */
|
2005-04-17 05:20:36 +07:00
|
|
|
else
|
2009-09-19 03:05:43 +07:00
|
|
|
printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for"
|
|
|
|
" inode %s:%lu\n", mode, inode->i_sb->s_id,
|
|
|
|
inode->i_ino);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(init_special_inode);
|
2010-03-04 21:29:14 +07:00
|
|
|
|
|
|
|
/**
|
2011-02-15 19:48:09 +07:00
|
|
|
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards
|
2010-03-04 21:29:14 +07:00
|
|
|
* @inode: New inode
|
|
|
|
* @dir: Directory inode
|
|
|
|
* @mode: mode of the new inode
|
|
|
|
*/
|
|
|
|
void inode_init_owner(struct inode *inode, const struct inode *dir,
|
2011-07-25 10:20:18 +07:00
|
|
|
umode_t mode)
|
2010-03-04 21:29:14 +07:00
|
|
|
{
|
|
|
|
inode->i_uid = current_fsuid();
|
|
|
|
if (dir && dir->i_mode & S_ISGID) {
|
|
|
|
inode->i_gid = dir->i_gid;
|
2018-07-04 07:10:19 +07:00
|
|
|
|
|
|
|
/* Directories are special, and always inherit S_ISGID */
|
2010-03-04 21:29:14 +07:00
|
|
|
if (S_ISDIR(mode))
|
|
|
|
mode |= S_ISGID;
|
2018-07-04 07:10:19 +07:00
|
|
|
else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
|
|
|
|
!in_group_p(inode->i_gid) &&
|
|
|
|
!capable_wrt_inode_uidgid(dir, CAP_FSETID))
|
|
|
|
mode &= ~S_ISGID;
|
2010-03-04 21:29:14 +07:00
|
|
|
} else
|
|
|
|
inode->i_gid = current_fsgid();
|
|
|
|
inode->i_mode = mode;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_init_owner);
|
2011-03-24 06:43:25 +07:00
|
|
|
|
2011-03-24 06:43:26 +07:00
|
|
|
/**
|
|
|
|
* inode_owner_or_capable - check current task permissions to inode
|
|
|
|
* @inode: inode being checked
|
|
|
|
*
|
2014-06-11 02:45:42 +07:00
|
|
|
* Return true if current either has CAP_FOWNER in a namespace with the
|
|
|
|
* inode owner uid mapped, or owns the file.
|
2011-03-24 06:43:25 +07:00
|
|
|
*/
|
2011-03-24 06:43:26 +07:00
|
|
|
bool inode_owner_or_capable(const struct inode *inode)
|
2011-03-24 06:43:25 +07:00
|
|
|
{
|
2014-06-11 02:45:42 +07:00
|
|
|
struct user_namespace *ns;
|
|
|
|
|
2012-02-08 22:07:50 +07:00
|
|
|
if (uid_eq(current_fsuid(), inode->i_uid))
|
2011-03-24 06:43:25 +07:00
|
|
|
return true;
|
2014-06-11 02:45:42 +07:00
|
|
|
|
|
|
|
ns = current_user_ns();
|
2017-06-21 23:53:06 +07:00
|
|
|
if (kuid_has_mapping(ns, inode->i_uid) && ns_capable(ns, CAP_FOWNER))
|
2011-03-24 06:43:25 +07:00
|
|
|
return true;
|
|
|
|
return false;
|
|
|
|
}
|
2011-03-24 06:43:26 +07:00
|
|
|
EXPORT_SYMBOL(inode_owner_or_capable);
|
2012-05-31 23:22:33 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Direct i/o helper functions
|
|
|
|
*/
|
|
|
|
static void __inode_dio_wait(struct inode *inode)
|
|
|
|
{
|
|
|
|
wait_queue_head_t *wq = bit_waitqueue(&inode->i_state, __I_DIO_WAKEUP);
|
|
|
|
DEFINE_WAIT_BIT(q, &inode->i_state, __I_DIO_WAKEUP);
|
|
|
|
|
|
|
|
do {
|
2017-03-05 17:25:39 +07:00
|
|
|
prepare_to_wait(wq, &q.wq_entry, TASK_UNINTERRUPTIBLE);
|
2012-05-31 23:22:33 +07:00
|
|
|
if (atomic_read(&inode->i_dio_count))
|
|
|
|
schedule();
|
|
|
|
} while (atomic_read(&inode->i_dio_count));
|
2017-03-05 17:25:39 +07:00
|
|
|
finish_wait(wq, &q.wq_entry);
|
2012-05-31 23:22:33 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* inode_dio_wait - wait for outstanding DIO requests to finish
|
|
|
|
* @inode: inode to wait for
|
|
|
|
*
|
|
|
|
* Waits for all pending direct I/O requests to finish so that we can
|
|
|
|
* proceed with a truncate or equivalent operation.
|
|
|
|
*
|
|
|
|
* Must be called under a lock that serializes taking new references
|
|
|
|
* to i_dio_count, usually by inode->i_mutex.
|
|
|
|
*/
|
|
|
|
void inode_dio_wait(struct inode *inode)
|
|
|
|
{
|
|
|
|
if (atomic_read(&inode->i_dio_count))
|
|
|
|
__inode_dio_wait(inode);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_dio_wait);
|
|
|
|
|
2014-03-25 01:43:12 +07:00
|
|
|
/*
|
|
|
|
* inode_set_flags - atomically set some inode flags
|
|
|
|
*
|
|
|
|
* Note: the caller should be holding i_mutex, or else be sure that
|
|
|
|
* they have exclusive access to the inode structure (i.e., while the
|
|
|
|
* inode is being instantiated). The reason for the cmpxchg() loop
|
|
|
|
* --- which wouldn't be necessary if all code paths which modify
|
|
|
|
* i_flags actually followed this rule, is that there is at least one
|
2015-05-21 21:05:53 +07:00
|
|
|
* code path which doesn't today so we use cmpxchg() out of an abundance
|
|
|
|
* of caution.
|
2014-03-25 01:43:12 +07:00
|
|
|
*
|
|
|
|
* In the long run, i_mutex is overkill, and we should probably look
|
|
|
|
* at using the i_lock spinlock to protect i_flags, and then make sure
|
|
|
|
* it is so documented in include/linux/fs.h and that all code follows
|
|
|
|
* the locking convention!!
|
|
|
|
*/
|
|
|
|
void inode_set_flags(struct inode *inode, unsigned int flags,
|
|
|
|
unsigned int mask)
|
|
|
|
{
|
|
|
|
WARN_ON_ONCE(flags & ~mask);
|
2019-03-06 06:41:52 +07:00
|
|
|
set_mask_bits(&inode->i_flags, mask, flags);
|
2014-03-25 01:43:12 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_set_flags);
|
2015-11-17 13:07:57 +07:00
|
|
|
|
|
|
|
void inode_nohighmem(struct inode *inode)
|
|
|
|
{
|
|
|
|
mapping_set_gfp_mask(inode->i_mapping, GFP_USER);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_nohighmem);
|
2016-09-14 21:48:02 +07:00
|
|
|
|
2018-04-23 10:18:46 +07:00
|
|
|
/**
|
|
|
|
* timespec64_trunc - Truncate timespec64 to a granularity
|
|
|
|
* @t: Timespec64
|
|
|
|
* @gran: Granularity in ns.
|
|
|
|
*
|
|
|
|
* Truncate a timespec64 to a granularity. Always rounds down. gran must
|
|
|
|
* not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).
|
|
|
|
*/
|
|
|
|
struct timespec64 timespec64_trunc(struct timespec64 t, unsigned gran)
|
|
|
|
{
|
|
|
|
/* Avoid division in the common cases 1 ns and 1 s. */
|
|
|
|
if (gran == 1) {
|
|
|
|
/* nothing */
|
|
|
|
} else if (gran == NSEC_PER_SEC) {
|
|
|
|
t.tv_nsec = 0;
|
|
|
|
} else if (gran > 1 && gran < NSEC_PER_SEC) {
|
|
|
|
t.tv_nsec -= t.tv_nsec % gran;
|
|
|
|
} else {
|
|
|
|
WARN(1, "illegal file time granularity: %u", gran);
|
|
|
|
}
|
|
|
|
return t;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(timespec64_trunc);
|
|
|
|
|
2016-09-14 21:48:02 +07:00
|
|
|
/**
|
|
|
|
* current_time - Return FS time
|
|
|
|
* @inode: inode.
|
|
|
|
*
|
|
|
|
* Return the current time truncated to the time granularity supported by
|
|
|
|
* the fs.
|
|
|
|
*
|
|
|
|
* Note that inode and inode->sb cannot be NULL.
|
|
|
|
* Otherwise, the function warns and returns time without truncation.
|
|
|
|
*/
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
struct timespec64 current_time(struct inode *inode)
|
2016-09-14 21:48:02 +07:00
|
|
|
{
|
vfs: replace current_kernel_time64 with ktime equivalent
current_time is the last remaining caller of current_kernel_time64(),
which is a wrapper around ktime_get_coarse_real_ts64(). This calls the
latter directly for consistency with the rest of the kernel that is moving
to the ktime_get_ family of time accessors, as now documented in
Documentation/core-api/timekeeping.rst.
An open questions is whether we may want to actually call the more
accurate ktime_get_real_ts64() for file systems that save high-resolution
timestamps in their on-disk format. This would add a small overhead to
each update of the inode stamps but lead to inode timestamps to actually
have a usable resolution better than one jiffy (1 to 10 milliseconds
normally). Experiments on a variety of hardware platforms show a typical
time of around 100 CPU cycles to read the cycle counter and calculate the
accurate time from that. On old platforms without a cycle counter, this
can be signiciantly higher, up to several microseconds to access a
hardware clock, but those have become very rare by now.
I traced the original addition of the current_kernel_time() call to set
the nanosecond fields back to linux-2.5.48, where Andi Kleen added a patch
with subject "nanosecond stat timefields". Andi explains that the
motivation was to introduce as little overhead as possible back then. At
this time, reading the clock hardware was also more expensive when most
architectures did not have a cycle counter.
One side effect of having more accurate inode timestamp would be having to
write out the inode every time that mtime/ctime/atime get touched on most
systems, whereas many file systems today only write it when the timestamps
have changed, i.e. at most once per jiffy unless something else changes
as well. That change would certainly be noticed in some workloads, which
is enough reason to not do it without a good reason, regardless of the
cost of reading the time.
One thing we could still consider however would be to round the timestamps
from current_time() to multiples of NSEC_PER_JIFFY, e.g. full
milliseconds rather than having six or seven meaningless but confusing
digits at the end of the timestamp.
Link: http://lkml.kernel.org/r/20180726130820.4174359-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-12-05 07:14:27 +07:00
|
|
|
struct timespec64 now;
|
|
|
|
|
|
|
|
ktime_get_coarse_real_ts64(&now);
|
2016-09-14 21:48:02 +07:00
|
|
|
|
|
|
|
if (unlikely(!inode->i_sb)) {
|
|
|
|
WARN(1, "current_time() called with uninitialized super_block in the inode");
|
|
|
|
return now;
|
|
|
|
}
|
|
|
|
|
vfs: change inode times to use struct timespec64
struct timespec is not y2038 safe. Transition vfs to use
y2038 safe struct timespec64 instead.
The change was made with the help of the following cocinelle
script. This catches about 80% of the changes.
All the header file and logic changes are included in the
first 5 rules. The rest are trivial substitutions.
I avoid changing any of the function signatures or any other
filesystem specific data structures to keep the patch simple
for review.
The script can be a little shorter by combining different cases.
But, this version was sufficient for my usecase.
virtual patch
@ depends on patch @
identifier now;
@@
- struct timespec
+ struct timespec64
current_time ( ... )
{
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
...
- return timespec_trunc(
+ return timespec64_trunc(
... );
}
@ depends on patch @
identifier xtime;
@@
struct \( iattr \| inode \| kstat \) {
...
- struct timespec xtime;
+ struct timespec64 xtime;
...
}
@ depends on patch @
identifier t;
@@
struct inode_operations {
...
int (*update_time) (...,
- struct timespec t,
+ struct timespec64 t,
...);
...
}
@ depends on patch @
identifier t;
identifier fn_update_time =~ "update_time$";
@@
fn_update_time (...,
- struct timespec *t,
+ struct timespec64 *t,
...) { ... }
@ depends on patch @
identifier t;
@@
lease_get_mtime( ... ,
- struct timespec *t
+ struct timespec64 *t
) { ... }
@te depends on patch forall@
identifier ts;
local idexpression struct inode *inode_node;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn_update_time =~ "update_time$";
identifier fn;
expression e, E3;
local idexpression struct inode *node1;
local idexpression struct inode *node2;
local idexpression struct iattr *attr1;
local idexpression struct iattr *attr2;
local idexpression struct iattr attr;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
@@
(
(
- struct timespec ts;
+ struct timespec64 ts;
|
- struct timespec ts = current_time(inode_node);
+ struct timespec64 ts = current_time(inode_node);
)
<+... when != ts
(
- timespec_equal(&inode_node->i_xtime, &ts)
+ timespec64_equal(&inode_node->i_xtime, &ts)
|
- timespec_equal(&ts, &inode_node->i_xtime)
+ timespec64_equal(&ts, &inode_node->i_xtime)
|
- timespec_compare(&inode_node->i_xtime, &ts)
+ timespec64_compare(&inode_node->i_xtime, &ts)
|
- timespec_compare(&ts, &inode_node->i_xtime)
+ timespec64_compare(&ts, &inode_node->i_xtime)
|
ts = current_time(e)
|
fn_update_time(..., &ts,...)
|
inode_node->i_xtime = ts
|
node1->i_xtime = ts
|
ts = inode_node->i_xtime
|
<+... attr1->ia_xtime ...+> = ts
|
ts = attr1->ia_xtime
|
ts.tv_sec
|
ts.tv_nsec
|
btrfs_set_stack_timespec_sec(..., ts.tv_sec)
|
btrfs_set_stack_timespec_nsec(..., ts.tv_nsec)
|
- ts = timespec64_to_timespec(
+ ts =
...
-)
|
- ts = ktime_to_timespec(
+ ts = ktime_to_timespec64(
...)
|
- ts = E3
+ ts = timespec_to_timespec64(E3)
|
- ktime_get_real_ts(&ts)
+ ktime_get_real_ts64(&ts)
|
fn(...,
- ts
+ timespec64_to_timespec(ts)
,...)
)
...+>
(
<... when != ts
- return ts;
+ return timespec64_to_timespec(ts);
...>
)
|
- timespec_equal(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_equal(&node1->i_xtime2, &node2->i_xtime2)
|
- timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2)
+ timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2)
|
- timespec_compare(&node1->i_xtime1, &node2->i_xtime2)
+ timespec64_compare(&node1->i_xtime1, &node2->i_xtime2)
|
node1->i_xtime1 =
- timespec_trunc(attr1->ia_xtime1,
+ timespec64_trunc(attr1->ia_xtime1,
...)
|
- attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2,
+ attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2,
...)
|
- ktime_get_real_ts(&attr1->ia_xtime1)
+ ktime_get_real_ts64(&attr1->ia_xtime1)
|
- ktime_get_real_ts(&attr.ia_xtime1)
+ ktime_get_real_ts64(&attr.ia_xtime1)
)
@ depends on patch @
struct inode *node;
struct iattr *attr;
identifier fn;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
expression e;
@@
(
- fn(node->i_xtime);
+ fn(timespec64_to_timespec(node->i_xtime));
|
fn(...,
- node->i_xtime);
+ timespec64_to_timespec(node->i_xtime));
|
- e = fn(attr->ia_xtime);
+ e = fn(timespec64_to_timespec(attr->ia_xtime));
)
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
identifier i_xtime =~ "^i_[acm]time$";
identifier ia_xtime =~ "^ia_[acm]time$";
identifier fn;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
fn (...,
- &attr->ia_xtime,
+ &ts,
...);
)
...+>
}
@ depends on patch forall @
struct inode *node;
struct iattr *attr;
struct kstat *stat;
identifier ia_xtime =~ "^ia_[acm]time$";
identifier i_xtime =~ "^i_[acm]time$";
identifier xtime =~ "^[acm]time$";
identifier fn, ret;
@@
{
+ struct timespec ts;
<+...
(
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(node->i_xtime);
ret = fn (...,
- &node->i_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime,
+ &ts,
...);
|
+ ts = timespec64_to_timespec(attr->ia_xtime);
ret = fn (...,
- &attr->ia_xtime);
+ &ts);
|
+ ts = timespec64_to_timespec(stat->xtime);
ret = fn (...,
- &stat->xtime);
+ &ts);
)
...+>
}
@ depends on patch @
struct inode *node;
struct inode *node2;
identifier i_xtime1 =~ "^i_[acm]time$";
identifier i_xtime2 =~ "^i_[acm]time$";
identifier i_xtime3 =~ "^i_[acm]time$";
struct iattr *attrp;
struct iattr *attrp2;
struct iattr attr ;
identifier ia_xtime1 =~ "^ia_[acm]time$";
identifier ia_xtime2 =~ "^ia_[acm]time$";
struct kstat *stat;
struct kstat stat1;
struct timespec64 ts;
identifier xtime =~ "^[acmb]time$";
expression e;
@@
(
( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ;
|
node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \);
|
stat->xtime = node2->i_xtime1;
|
stat1.xtime = node2->i_xtime1;
|
( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ;
|
( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2;
|
- e = node->i_xtime1;
+ e = timespec64_to_timespec( node->i_xtime1 );
|
- e = attrp->ia_xtime1;
+ e = timespec64_to_timespec( attrp->ia_xtime1 );
|
node->i_xtime1 = current_time(...);
|
node->i_xtime2 = node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
node->i_xtime1 = node->i_xtime3 =
- e;
+ timespec_to_timespec64(e);
|
- node->i_xtime1 = e;
+ node->i_xtime1 = timespec_to_timespec64(e);
)
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <anton@tuxera.com>
Cc: <balbi@kernel.org>
Cc: <bfields@fieldses.org>
Cc: <darrick.wong@oracle.com>
Cc: <dhowells@redhat.com>
Cc: <dsterba@suse.com>
Cc: <dwmw2@infradead.org>
Cc: <hch@lst.de>
Cc: <hirofumi@mail.parknet.co.jp>
Cc: <hubcap@omnibond.com>
Cc: <jack@suse.com>
Cc: <jaegeuk@kernel.org>
Cc: <jaharkes@cs.cmu.edu>
Cc: <jslaby@suse.com>
Cc: <keescook@chromium.org>
Cc: <mark@fasheh.com>
Cc: <miklos@szeredi.hu>
Cc: <nico@linaro.org>
Cc: <reiserfs-devel@vger.kernel.org>
Cc: <richard@nod.at>
Cc: <sage@redhat.com>
Cc: <sfrench@samba.org>
Cc: <swhiteho@redhat.com>
Cc: <tj@kernel.org>
Cc: <trond.myklebust@primarydata.com>
Cc: <tytso@mit.edu>
Cc: <viro@zeniv.linux.org.uk>
2018-05-09 09:36:02 +07:00
|
|
|
return timespec64_trunc(now, inode->i_sb->s_time_gran);
|
2016-09-14 21:48:02 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(current_time);
|