Commit Graph

27555 Commits

Author SHA1 Message Date
Jan Kara
cb14d340ef udf: Use 'ret' instead of abusing 'i' in udf_load_logicalvol()
Signed-off-by: Jan Kara <jack@suse.cz>
2012-06-28 19:30:40 +02:00
Jan Schmidt
d42244a0d3 Btrfs: resolve tree mod log locking issue in btrfs_next_leaf
With the tree mod log, we may end up with two roots (the current root and a
rewinded version of it) both pointing to two leaves, l1 and l2, of which l2
had already been cow-ed in the current transaction. If we don't rewind any
tree blocks, we cannot have two roots both pointing to an already cowed tree
block.

Now there is btrfs_next_leaf, which has a leaf locked and wants a lock on
the next (right) leaf. And there is push_leaf_left, which has a (cowed!)
leaf locked and wants a lock on the previous (left) leaf.

In order to solve this dead lock situation, we use try_lock in
btrfs_next_leaf (only in case it's called with a tree mod log time_seq
paramter) and if we fail to get a lock on the next leaf, we give up our lock
on the current leaf and retry from the very beginning.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:40 +02:00
Jan Schmidt
19956c7e94 Btrfs: fix tree mod log rewind of ADD operations
When a MOD_LOG_KEY_ADD operation is rewinded, we remove the key from the
tree block. If its not the last key, removal involves a move operation.
This move operation was explicitly done before this commit.

However, at insertion time, there's a move operation before the actual
addition to make room for the new key, which is recorded in the tree mod
log as well. This means, we must drop the move operation when rewinding the
add operation, because the next operation we'll be rewinding will be the
corresponding MOD_LOG_MOVE_KEYS operation.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:40 +02:00
Jan Schmidt
155725c9c0 Btrfs: leave critical region in btrfs_find_all_roots as soon as possible
When delayed refs exist, btrfs_find_all_roots used to hold the delayed ref
mutex way longer than actually required. We ought to drop it immediately
after we're done collecting all the delayed refs.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:39 +02:00
Jan Schmidt
c3e0696523 Btrfs: always put insert_ptr modifications into the tree mod log
Several callers of insert_ptr set the tree_mod_log parameter to 0 to avoid
addition to the tree mod log. In fact, we need all of those operations. This
commit simply removes the additional parameter and makes addition to the
tree mod log unconditional.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:39 +02:00
Jan Schmidt
28da9fb446 Btrfs: fix tree mod log for root replacements at leaf level
For the tree mod log, we don't log any operations at leaf level. If the root
is at the leaf level (i.e. the tree consists only of the root), then
__tree_mod_log_oldest_root will find a ROOT_REPLACE operation in the log
(because we always log that one no matter which level), but no other
operations.

With this patch __tree_mod_log_oldest_root exits cleanly instead of
BUGging in this situation. get_old_root checks if its really a root at leaf
level in case we don't have any operations and WARNs if this assumption
breaks.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:38 +02:00
Jan Schmidt
9345457f4a Btrfs: support root level changes in __resolve_indirect_ref
With the tree mod log, we can have a tree that's two levels high, but
btrfs_search_old_slot may still return a path with the tree root at level
one instead. __resolve_indirect_ref must care for this and accept parents in
a lower level than expected.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:38 +02:00
Jan Schmidt
8ca78f3eda Btrfs: avoid waiting for delayed refs when we must not
We track two conditions to decide if we should sleep while waiting for more
delayed refs, the number of delayed refs (num_refs) and the first entry in
the list of blockers (first_seq).

When we suspect staleness, we save num_refs and do one more cycle. If
nothing changes, we then save first_seq for later comparison and do
wait_event. We ought to save first_seq the very same moment we're saving
num_refs. Otherwise we cannot be sure that nothing has changed and we might
start waiting when we shouldn't, which could lead to starvation.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-27 16:34:35 +02:00
Brian Norris
2d4cf5ae12 UBIFS: correct usage of IS_ENABLED()
Commit "818039c UBIFS: fix debugfs-less systems support" fixed one
regression but introduced a different regression - the debugfs is now always
compiled out. Root cause: IS_ENABLED() arguments should be used with the
CONFIG_* prefix.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-06-27 14:22:15 +03:00
Linus Torvalds
002b758b6d Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
Pull Ceph fixes from Sage Weil:
 "There are a couple of fixes from Yan for bad pointer dereferences in
  the messenger code and when fiddling with page->private after page
  migration, a fix from Alex for a use-after-free in the osd client
  code, and a couple fixes for the message refcounting and shutdown
  ordering."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  libceph: flush msgr queue during mon_client shutdown
  rbd: Clear ceph_msg->bio_iter for retransmitted message
  libceph: use con get/put ops from osd_client
  libceph: osd_client: don't drop reply reference too early
  ceph: check PG_Private flag before accessing page->private
2012-06-22 17:47:08 -07:00
Linus Torvalds
369c4f542f Fixes for 3.5-rc
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Merge tag 'for-linus-Jun-21-2012' of git://oss.sgi.com/xfs/xfs

Pull XFS fixes from Ben Myers:
 - Fix stale data exposure with unwritten extents
 - Fix a warning in xfs_alloc_vextent with ODEBUG
 - Fix overallocation and alignment of pages for xfs_bufs
 - Fix a cursor leak
 - Fix a log hang
 - Fix a crash related to xfs_sync_worker
 - Rename xfs log structure from struct log to struct xlog so we can use
   crash dumps effectively

* tag 'for-linus-Jun-21-2012' of git://oss.sgi.com/xfs/xfs:
  xfs: rename log structure to xlog
  xfs: shutdown xfs_sync_worker before the log
  xfs: Fix overallocation in xfs_buf_allocate_memory()
  xfs: fix allocbt cursor leak in xfs_alloc_ag_vextent_near
  xfs: check for stale inode before acquiring iflock on push
  xfs: fix debug_object WARN at xfs_alloc_vextent()
  xfs: xfs_vm_writepage clear iomap_valid when !buffer_uptodate (REV2)
2012-06-22 11:07:55 -07:00
Linus Torvalds
636040b4ed NFS client bugfixes for Linux 3.5
Fixes include:
 - Fix a write hang due to an uninitalised variable when !defined(CONFIG_NFS_V4)
 - Address upcall races in the legacy NFSv4 idmapper
 - Remove an O_DIRECT refcounting issue
 - Fix a pNFS refcounting bug when the file layout metadata server is also
   acting as a data server
 - Fix a pNFS module loading race.
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Merge tag 'nfs-for-3.5-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 - Fix a write hang due to an uninitalised variable when
   !defined(CONFIG_NFS_V4)
 - Address upcall races in the legacy NFSv4 idmapper
 - Remove an O_DIRECT refcounting issue
 - Fix a pNFS refcounting bug when the file layout metadata server is
   also acting as a data server
 - Fix a pNFS module loading race.

* tag 'nfs-for-3.5-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Force the legacy idmapper to be single threaded
  NFS: Initialise commit_info.rpc_out when !defined(CONFIG_NFS_V4)
  NFS: Fix a refcounting issue in O_DIRECT
  NFSv4.1: Fix a race in set_pnfs_layoutdriver
  NFSv4.1: Fix umount when filelayout DS is also the MDS
2012-06-21 16:05:43 -07:00
Linus Torvalds
8874e812fe Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs fixes from Chris Mason:
 "This is a small pull with btrfs fixes.  The biggest of the bunch is
  another fix for the new backref walking code.

  We're still hammering out one btrfs dio vs buffered reads problem, but
  that one will have to wait for the next rc."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: delay iput with async extents
  Btrfs: add a missing spin_lock
  Btrfs: don't assume to be on the correct extent in add_all_parents
  Btrfs: introduce btrfs_next_old_item
2012-06-21 13:41:07 -07:00
Mark Tinguely
f7bdf03a99 xfs: rename log structure to xlog
Rename the XFS log structure to xlog to help crash distinquish it from the
other logs in Linux.

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-21 14:21:11 -05:00
Ben Myers
8866fc6fa5 xfs: shutdown xfs_sync_worker before the log
Revert commit 1307bbd, which uses the s_umount semaphore to provide
exclusion between xfs_sync_worker and unmount, in favor of shutting down
the sync worker before freeing the log in xfs_log_unmount.  This is a
cleaner way of resolving the race between xfs_sync_worker and unmount
than using s_umount.

Signed-off-by: Ben Myers <bpm@sgi.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2012-06-21 14:20:48 -05:00
Jan Kara
59c84ed0dd xfs: Fix overallocation in xfs_buf_allocate_memory()
Commit de1cbee which removed b_file_offset in favor of b_bn introduced a bug
causing xfs_buf_allocate_memory() to overestimate the number of necessary
pages. The problem is that xfs_buf_alloc() sets b_bn to -1 and thus effectively
every buffer is straddling a page boundary which causes
xfs_buf_allocate_memory() to allocate two pages and use vmalloc() for access
which is unnecessary.

Dave says xfs_buf_alloc() doesn't need to set b_bn to -1 anymore since the
buffer is inserted into the cache only after being fully initialized now.
So just make xfs_buf_alloc() fill in proper block number from the beginning.

CC: David Chinner <dchinner@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-21 14:20:36 -05:00
Dave Chinner
76d095388b xfs: fix allocbt cursor leak in xfs_alloc_ag_vextent_near
When we fail to find an matching extent near the requested extent
specification during a left-right distance search in
xfs_alloc_ag_vextent_near, we fail to free the original cursor that
we used to look up the XFS_BTNUM_CNT tree and hence leak it.

Reported-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-21 14:20:20 -05:00
Brian Foster
9a3a5dab63 xfs: check for stale inode before acquiring iflock on push
An inode in the AIL can be flush locked and marked stale if
a cluster free transaction occurs at the right time. The
inode item is then marked as flushing, which causes xfsaild
to spin and leaves the filesystem stalled. This is
reproduced by running xfstests 273 in a loop for an
extended period of time.

Check for stale inodes before the flush lock. This marks
the inode as pinned, leads to a log flush and allows the
filesystem to proceed.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-21 14:20:06 -05:00
Josef Bacik
cb77fcd885 Btrfs: delay iput with async extents
There is some concern that these iput()'s could be the final iputs and could
induce lockups on people waiting on writeback.  This would happen in the
rare case that we don't create ordered extents because of an error, but it
is theoretically possible and we already have a mechanism to deal with this
so just make them delayed iputs to negate any worry.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-21 07:19:36 -04:00
Josef Bacik
e18fca7342 Btrfs: add a missing spin_lock
When fixing up the locking in the delayed ref destruction work I accidently
broke the locking myself ;(.  Add back a spin_lock that should be there and
we are now all set.  Thanks,
Btrfs: add a missing spin_lock

When fixing up the locking in the delayed ref destruction work I accidently
broke the locking myself ;(.  Add back a spin_lock that should be there and
we are now all set.  Thanks,

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-21 07:19:35 -04:00
Alexander Block
69bca40d41 Btrfs: don't assume to be on the correct extent in add_all_parents
add_all_parents did assume that path is already at a correct extent data
item, which may not be true in case of data extents that were partly
rewritten and splitted.

We need to check if we're on a matching extent for every item and only
for the ones after the first. The loop is changed to do this now.

This patch also fixes a bug introduced with commit 3b127fd8 "Btrfs:
remove obsolete btrfs_next_leaf call from __resolve_indirect_ref".
The removal of next_leaf did sometimes result in slot==nritems when
the above described case happens, and thus resulting in invalid values
(e.g. wanted_obejctid) in add_all_parents (leading to missed backrefs
or even crashes).

Signed-off-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-21 07:19:34 -04:00
Alexander Block
1c8f52a5e9 Btrfs: introduce btrfs_next_old_item
We introduce btrfs_next_old_item that uses btrfs_next_old_leaf instead
of btrfs_next_leaf.

btrfs_next_item is also changed to simply call btrfs_next_old_item with
time_seq being 0.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-21 07:19:34 -04:00
Linus Torvalds
bc259adc9b staging tree fixes for 3.5-rc4
Here are a number of small fixes for the drivers/staging tree, as well as iio
 and pstore drivers (which came from the staging tree in the 3.5-rc1 merge).
 All of these are tiny, but resolve issues that people have been reporting.
 
 There's also a documentation update to reflect what the iio drivers really are
 doing, which is good to get straightened out.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging tree fixes from Greg Kroah-Hartman:
 "Here are a number of small fixes for the drivers/staging tree, as well
  as iio and pstore drivers (which came from the staging tree in the
  3.5-rc1 merge).  All of these are tiny, but resolve issues that people
  have been reporting.

  There's also a documentation update to reflect what the iio drivers
  really are doing, which is good to get straightened out.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'staging-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: r8712u: Add new USB IDs
  staging: gdm72xx: Release netlink socket properly
  iio: drop wrong reference from Kconfig
  pstore/inode: Make pstore_fill_super() static
  pstore/ram: Should zap persistent zone on unlink
  pstore/ram_core: Factor persistent_ram_zap() out of post_init()
  pstore/ram_core: Do not reset restored zone's position and size
  pstore/ram: Should update old dmesg buffer before reading
  staging:iio:ad7298: Fix linker error due to missing IIO kfifo buffer
  Revert "staging: usbip: bugfix for stack corruption on 64-bit architectures"
  staging: usbip: bugfix for stack corruption on 64-bit architectures
  staging/comedi: fix build for USB not enabled
  staging: omapdrm: fix crash when freeing bad fb
  staging:iio:ad7606: Re-add missing scale attribute
  iio: Fix potential use after free
  staging:iio: remove num_interrupt_lines from documentation
  iio: documentation: Add out_altvoltage and friends
2012-06-20 15:15:03 -07:00
Linus Torvalds
fe80352460 Driver core and printk fixes for 3.5-rc4
Here are some fixes for 3.5-rc4 that resolve the kmsg problems that
 people have reported showing up after the printk and kmsg changes went
 into 3.5-rc1.  There are also a smattering of other tiny fixes for the
 extcon and hyper-v drivers that people have reported.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core and printk fixes from Greg Kroah-Hartman:
 "Here are some fixes for 3.5-rc4 that resolve the kmsg problems that
  people have reported showing up after the printk and kmsg changes went
  into 3.5-rc1.  There are also a smattering of other tiny fixes for the
  extcon and hyper-v drivers that people have reported.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'driver-core-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  extcon: max8997: Add missing kfree for info->edev in max8997_muic_remove()
  extcon: Set platform drvdata in gpio_extcon_probe() and fix irq leak
  extcon: Fix wrong index in max8997_extcon_cable[]
  kmsg - kmsg_dump() fix CONFIG_PRINTK=n compilation
  printk: return -EINVAL if the message len is bigger than the buf size
  printk: use mutex lock to stop syslog_seq from going wild
  kmsg - kmsg_dump() use iterator to receive log buffer content
  vme: change maintainer e-mail address
  Extcon: Don't try to create duplicate link names
  driver core: fixup reversed deferred probe order
  printk: Fix alignment of buf causing crash on ARM EABI
  Tools: hv: verify origin of netlink connector message
2012-06-20 15:14:28 -07:00
Linus Torvalds
a2a2609c97 Merge branch 'akpm' (Andrew's patch-bomb)
* emailed from Andrew Morton <akpm@linux-foundation.org>: (21 patches)
  mm/memblock: fix overlapping allocation when doubling reserved array
  c/r: prctl: Move PR_GET_TID_ADDRESS to a proper place
  pidns: find_new_reaper() can no longer switch to init_pid_ns.child_reaper
  pidns: guarantee that the pidns init will be the last pidns process reaped
  fault-inject: avoid call to random32() if fault injection is disabled
  Viresh has moved
  get_maintainer: Fix --help warning
  mm/memory.c: fix kernel-doc warnings
  mm: fix kernel-doc warnings
  mm: correctly synchronize rss-counters at exit/exec
  mm, thp: print useful information when mmap_sem is unlocked in zap_pmd_range
  h8300: use the declarations provided by <asm/sections.h>
  h8300: fix use of extinct _sbss and _ebss
  xtensa: use the declarations provided by <asm/sections.h>
  xtensa: use "test -e" instead of bashism "test -a"
  xtensa: replace xtensa-specific _f{data,text} by _s{data,text}
  memcg: fix use_hierarchy css_is_ancestor oops regression
  mm, oom: fix and cleanup oom score calculations
  nilfs2: ensure proper cache clearing for gc-inodes
  thp: avoid atomic64_read in pmd_read_atomic for 32bit PAE
  ...
2012-06-20 14:41:57 -07:00
Konstantin Khlebnikov
4fe7efdbdf mm: correctly synchronize rss-counters at exit/exec
do_exit() and exec_mmap() call sync_mm_rss() before mm_release() does
put_user(clear_child_tid) which can update task->rss_stat and thus make
mm->rss_stat inconsistent.  This triggers the "BUG:" printk in check_mm().

Let's fix this bug in the safest way, and optimize/cleanup this later.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-20 14:39:36 -07:00
Ryusuke Konishi
fbb24a3a91 nilfs2: ensure proper cache clearing for gc-inodes
A gc-inode is a pseudo inode used to buffer the blocks to be moved by
garbage collection.

Block caches of gc-inodes must be cleared every time a garbage collection
function (nilfs_clean_segments) completes.  Otherwise, stale blocks
buffered in the caches may be wrongly reused in successive calls of the GC
function.

For user files, this is not a problem because their gc-inodes are
distinguished by a checkpoint number as well as an inode number.  They
never buffer different blocks if either an inode number, a checkpoint
number, or a block offset differs.

However, gc-inodes of sufile, cpfile and DAT file can store different data
for the same block offset.  Thus, the nilfs_clean_segments function can
move incorrect block for these meta-data files if an old block is cached.
I found this is really causing meta-data corruption in nilfs.

This fixes the issue by ensuring cache clear of gc-inodes and resolves
reported GC problems including checkpoint file corruption, b-tree
corruption, and the following warning during GC.

  nilfs_palloc_freev: entry number 307234 already freed.
  ...

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: <stable@vger.kernel.org>	[2.6.37+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-20 14:39:35 -07:00
Jeff Liu
3b876c8f2a xfs: fix debug_object WARN at xfs_alloc_vextent()
Fengguang reports:

[  780.529603] XFS (vdd): Ending clean mount
[  781.454590] ODEBUG: object is on stack, but not annotated
[  781.455433] ------------[ cut here ]------------
[  781.455433] WARNING: at /c/kernel-tests/sound/lib/debugobjects.c:301 __debug_object_init+0x173/0x1f1()
[  781.455433] Hardware name: Bochs
[  781.455433] Modules linked in:
[  781.455433] Pid: 26910, comm: kworker/0:2 Not tainted 3.4.0+ #51
[  781.455433] Call Trace:
[  781.455433]  [<ffffffff8106bc84>] warn_slowpath_common+0x83/0x9b
[  781.455433]  [<ffffffff8106bcb6>] warn_slowpath_null+0x1a/0x1c
[  781.455433]  [<ffffffff814919a5>] __debug_object_init+0x173/0x1f1
[  781.455433]  [<ffffffff81491c65>] debug_object_init+0x14/0x16
[  781.455433]  [<ffffffff8108842a>] __init_work+0x20/0x22
[  781.455433]  [<ffffffff8134ea56>] xfs_alloc_vextent+0x6c/0xd5

Use INIT_WORK_ONSTACK in xfs_alloc_vextent instead of INIT_WORK.

Reported-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-20 14:58:24 -05:00
Alain Renaud
66f9311381 xfs: xfs_vm_writepage clear iomap_valid when !buffer_uptodate (REV2)
On filesytems with a block size smaller than PAGE_SIZE we currently have
a problem with unwritten extents.  If a we have multi-block page for
which an unwritten extent has been allocated, and only some of the
buffers have been written to, and they are not contiguous, we can expose
stale data from disk in the blocks between the writes after extent
conversion.

Example of a page with unwritten and real data.
buffer  content
0       empty  b_state = 0
1       DATA   b_state = 0x1023 Uptodate,Dirty,Mapped,Unwritten
2       DATA   b_state = 0x1023 Uptodate,Dirty,Mapped,Unwritten
3       empty  b_state = 0
4       empty  b_state = 0
5       DATA   b_state = 0x1023 Uptodate,Dirty,Mapped,Unwritten
6       DATA   b_state = 0x1023 Uptodate,Dirty,Mapped,Unwritten
7       empty  b_state = 0

Buffers 1, 2, 5, and 6 have been written to, leaving 0, 3, 4, and 7
empty.  Currently buffers 1, 2, 5, and 6 are added to a single ioend,
and when IO has completed, extent conversion creates a real extent from
block 1 through block 6, leaving 0 and 7 unwritten.  However buffers 3
and 4 were not written to disk, so stale data is exposed from those
blocks on a subsequent read.

Fix this by setting iomap_valid = 0 when we find a buffer that is not
Uptodate.  This ensures that buffers 5 and 6 are not added to the same
ioend as buffers 1 and 2.  Later these blocks will be converted into two
separate real extents, leaving the blocks in between unwritten.

Signed-off-by: Alain Renaud <arenaud@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-06-20 14:57:28 -05:00
Bryan Schumaker
b1027439df NFS: Force the legacy idmapper to be single threaded
It was initially coded under the assumption that there would only be one
request at a time, so use a lock to enforce this requirement..

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
CC: stable@vger.kernel.org [3.4+]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-20 14:38:11 -04:00
Yan, Zheng
61600ef848 ceph: check PG_Private flag before accessing page->private
I got lots of NULL pointer dereference Oops when compiling kernel on ceph.
The bug is because the kernel page migration routine replaces some pages
in the page cache with new pages, these new pages' private can be non-zero.

Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 28c0254ede)
2012-06-20 07:43:48 -05:00
Trond Myklebust
1a0de48ae5 NFS: Initialise commit_info.rpc_out when !defined(CONFIG_NFS_V4)
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>
2012-06-19 18:42:28 -04:00
Trond Myklebust
5a695da263 NFS: Fix a refcounting issue in O_DIRECT
In nfs_direct_write_reschedule(), the requests from nfs_scan_commit_list
have a refcount of 2, whereas the operations in
nfs_direct_write_completion_ops expect them to have a refcount of 1.

This patch adds a call to release the extra references.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>
2012-06-19 18:42:14 -04:00
Trond Myklebust
0a9c63fae7 NFSv4.1: Fix a race in set_pnfs_layoutdriver
The call to try_module_get() dereferences ld_type outside the
spin locks, which means that it may be pointing to garbage if
a module unload was in progress.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-19 13:32:45 -04:00
Trond Myklebust
2a4c8994ee NFSv4.1: Fix umount when filelayout DS is also the MDS
Currently there is a 'chicken and egg' issue when the DS is also the mounted
MDS. The nfs_match_client() reference from nfs4_set_ds_client bumps the
cl_count, the nfs_client is not freed at umount, and nfs4_deviceid_purge_client
is not called to dereference the MDS usage of a deviceid which holds a
reference to the DS nfs_client.  The result is the umount program returns,
but the nfs_client is not freed, and the cl_session hearbeat continues.

The MDS (and all other nfs mounts) lose their last nfs_client reference in
nfs_free_server when the last nfs_server (fsid) is umounted.
The file layout DS lose their last nfs_client reference in destroy_ds
when the last deviceid referencing the data server is put and destroy_ds is
called. This is triggered by a call to nfs4_deviceid_purge_client which
removes references to a pNFS deviceid used by an MDS mount.

The fix is to track how many pnfs enabled filesystems are mounted from
this server, and then to purge the device id cache once that count reaches
zero.

Reported-by: Jorge Mora <Jorge.Mora@netapp.com>
Reported-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-18 08:45:16 -04:00
Dan Carpenter
1cfb727107 UBIFS: fix assertion
The asserts here never check anything because it uses '|' instead of
'&'.  Now if the flags are not set it prints a warning a a stack trace.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-06-18 14:17:08 +03:00
Matthew Garrett
7dea9665fe hfsplus: fix bless ioctl when used with hardlinks
HFS+ doesn't really implement hard links - instead, hardlinks are indicated
by a magic file type which refers to an indirect node in a hidden
directory. The spec indicates that stat() should return the inode number
of the indirect node, but it turns out that this doesn't satisfy the
firmware when it's looking for a bootloader - it wants the catalog ID of
the hardlink file instead. Fix up this case.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-17 14:39:59 -07:00
Janne Kalliomäki
a6dc8c0421 hfsplus: fix overflow in sector calculations in hfsplus_submit_bio
The variable io_size was unsigned int, which caused the wrong sector number
to be calculated after aligning it. This then caused mount to fail with big
volumes, as backup volume header information was searched from a
wrong sector.

Signed-off-by: Janne Kalliomäki <janne@tuxera.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-17 14:39:45 -07:00
Linus Torvalds
d865983292 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs compile warning fixes from Chris Mason.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: cast devid to unsigned long long for printk %llu
  Btrfs: init old_generation in get_old_root
2012-06-16 17:01:41 -07:00
Linus Torvalds
873b779d99 NFS client bugfixes for Linux 3.5
Highlights include:
 
  - Fix a couple of mount regressions due to the recent cleanups.
  - Fix an Oops in the open recovery code
  - Fix an rpc_pipefs upcall hang that results from some of the
    net namespace work from 3.4.x (stable kernel candidate).
  - Fix a couple of write and o_direct regressions that were found
    at last weeks Bakeathon testing event in Ann Arbor.
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Merge tag 'nfs-for-3.5-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

   - Fix a couple of mount regressions due to the recent cleanups.
   - Fix an Oops in the open recovery code
   - Fix an rpc_pipefs upcall hang that results from some of the net
     namespace work from 3.4.x (stable kernel candidate).
   - Fix a couple of write and o_direct regressions that were found at
     last weeks Bakeathon testing event in Ann Arbor."

* tag 'nfs-for-3.5-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: add an endian notation for sparse
  NFSv4.1: integer overflow in decode_cb_sequence_args()
  rpc_pipefs: allow rpc_purge_list to take a NULL waitq pointer
  NFSv4 do not send an empty SETATTR compound
  NFSv2: EOF incorrectly set on short read
  NFS: Use the NFS_DEFAULT_VERSION for v2 and v3 mounts
  NFS: fix directio refcount bug on commit
  NFSv4: Fix unnecessary delegation returns in nfs4_do_open
  NFSv4.1: Convert another trivial printk into a dprintk
  NFS4: Fix open bug when pnfs module blacklisted
  NFS: Remove incorrect BUG_ON in nfs_found_client
  NFS: Map minor mismatch error to protocol not support error.
  NFS: Fix a commit bug
  NFS4: Set parsed mount data version to 4
  NFSv4.1: Ensure we clear session state flags after a session creation
  NFSv4.1: Convert a trivial printk into a dprintk
  NFSv4: Fix up decode_attr_mdsthreshold
  NFSv4: Fix an Oops in the open recovery code
  NFSv4.1: Fix a request leak on the back channel
2012-06-15 17:37:23 -07:00
Linus Torvalds
93dd048dbd Merge branch 'for-3.5' of git://linux-nfs.org/~bfields/linux
Pull two nfsd bugfixes from J. Bruce Fields.

* 'for-3.5' of git://linux-nfs.org/~bfields/linux:
  nfsd4: BUG_ON(!is_spin_locked()) no good on UP kernels
  NFS: hard-code init_net for NFS callback transports
2012-06-15 17:27:31 -07:00
Chris Mason
a8c4a33b98 Btrfs: cast devid to unsigned long long for printk %llu
Avoid warning in 32 bit machines

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 20:07:17 -04:00
Chris Mason
4325edd078 Btrfs: init old_generation in get_old_root
gcc was giving an uninit variable warning here.  Strictly
speaking we don't need to init it, but this will make things
much less error prone.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 20:06:54 -04:00
Linus Torvalds
718f58ad61 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs update from Chris Mason:
 "The dates look like I had to rebase this morning because there was a
  compiler warning for a printk arg that I had missed earlier.

  These are all fixes, including one to prevent using stale pointers for
  device names, and lots of fixes around transaction abort cleanups
  (Josef, Liu Bo).

  Jan Schmidt also sent in a number of fixes for the new reference
  number tracking code.

  Liu Bo beat me to updating the MAINTAINERS file.  Since he thought to
  also fix the git url, I kept his commit."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (24 commits)
  Btrfs: update MAINTAINERS info for BTRFS FILE SYSTEM
  Btrfs: destroy the items of the delayed inodes in error handling routine
  Btrfs: make sure that we've made everything in pinned tree clean
  Btrfs: avoid memory leak of extent state in error handling routine
  Btrfs: do not resize a seeding device
  Btrfs: fix missing inherited flag in rename
  Btrfs: fix incompat flags setting
  Btrfs: fix defrag regression
  Btrfs: call filemap_fdatawrite twice for compression
  Btrfs: keep inode pinned when compressing writes
  Btrfs: implement ->show_devname
  Btrfs: use rcu to protect device->name
  Btrfs: unlock everything properly in the error case for nocow
  Btrfs: fix btrfs_destroy_marked_extents
  Btrfs: abort the transaction if the commit fails
  Btrfs: wake up transaction waiters when aborting a transaction
  Btrfs: fix locking in btrfs_destroy_delayed_refs
  Btrfs: pass locked_page into extent_clear_unlock_delalloc if theres an error
  Btrfs: fix race in tree mod log addition
  Btrfs: add btrfs_next_old_leaf
  ...
2012-06-15 16:04:37 -07:00
Kay Sievers
e2ae715d66 kmsg - kmsg_dump() use iterator to receive log buffer content
Provide an iterator to receive the log buffer content, and convert all
kmsg_dump() users to it.

The structured data in the kmsg buffer now contains binary data, which
should no longer be copied verbatim to the kmsg_dump() users.

The iterator should provide reliable access to the buffer data, and also
supports proper log line-aware chunking of data while iterating.

Signed-off-by: Kay Sievers <kay@vrfy.org>
Tested-by: Tony Luck <tony.luck@intel.com>
Reported-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Tested-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-15 14:53:59 -07:00
Miao Xie
67cde3448d Btrfs: destroy the items of the delayed inodes in error handling routine
the items of the delayed inodes were forgotten to be freed, this patch
fixes it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 11:42:28 -04:00
Liu Bo
ed0eaa1498 Btrfs: make sure that we've made everything in pinned tree clean
Since we have two trees for recording pinned extents, we need to go through
both of them to make sure that we've done everything clean.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 11:42:27 -04:00
Liu Bo
6e841e32b1 Btrfs: avoid memory leak of extent state in error handling routine
We've forgotten to clear extent states in pinned tree, which will results in
space counter mismatch and memory leak:

WARNING: at fs/btrfs/extent-tree.c:7537 btrfs_free_block_groups+0x1f3/0x2e0 [btrfs]()
...
space_info 2 has 8380416 free, is not full
space_info total=12582912, used=4096, pinned=4096, reserved=0, may_use=0, readonly=4194304
btrfs state leak: start 29364224 end 29376511 state 1 in tree ffff880075f20090 refs 1
...

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 11:42:27 -04:00
Liu Bo
4e42ae1bdc Btrfs: do not resize a seeding device
Seeding devices are not supposed to change any more.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 11:42:26 -04:00
Liu Bo
bc1782374b Btrfs: fix missing inherited flag in rename
When we move a file into a directory with compression flag, we need to
inherite BTRFS_INODE_COMPRESS and clear BTRFS_INODE_NOCOMPRESS as well.
But if we move a file into a directory without compression flag, we need
to clear both of them.

It is the way how our setflags deals with compression flag, so keep
the same behaviour here.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-06-15 11:33:30 -04:00
Chris Mason
acbcabd2de Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into for-linus 2012-06-15 11:33:16 -04:00
Li Zefan
69e380d176 Btrfs: fix incompat flags setting
It's a bug, but it happens to work, as BTRFS_COMPRESS_LZO == 2, which
has only one bit set.

Signed-off-by: Li Zefan <lizefan@huawei.com>
2012-06-14 21:30:57 -04:00
Li Zefan
6c282eb40e Btrfs: fix defrag regression
If a file has 3 small extents:

| ext1 | ext2 | ext3 |

Running "btrfs fi defrag" will only defrag the last two extents, if those
extent mappings hasn't been read into memory from disk.

This bug was introduced by commit 17ce6ef8d7
("Btrfs: add a check to decide if we should defrag the range")

The cause is, that commit looked into previous and next extents using
lookup_extent_mapping() only.

While at it, remove the code that checks the previous extent, since
it's sufficient to check the next extent.

Signed-off-by: Li Zefan <lizefan@huawei.com>
2012-06-14 21:30:55 -04:00
Josef Bacik
7ddf5a42d3 Btrfs: call filemap_fdatawrite twice for compression
I removed this in an earlier commit and I was wrong.  Because compression
can return from filemap_fdatawrite() without having actually set any of it's
pages as writeback() it can make filemap_fdatawait() do essentially nothing,
and then we won't find any ordered extents because they may not have been
created yet.  So not only does this make fsync() completely useless, but it
will also screw up if you truncate on a non-page aligned offset since we
zero out the end and then wait on ordered extents and then call drop caches.
We can drop the cache before the io completes and then we try to unpin the
extent we just wrote we won't find it and everything goes sideways.  So fix
this by putting it back and put a giant comment there to keep me from trying
to remove it in the future.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:30:54 -04:00
Josef Bacik
8180ef8894 Btrfs: keep inode pinned when compressing writes
A user reported lots of problems using compression on the new code and it
turns out part of the problem was that igrab() was failing when we added a
new ordered extent.  This is because when writing out an inode under
compression we immediately return without actually doing anything to the
pages, and then in another thread at some point down the line actually do
the ordered dance.  The problem is between the point that we start writeback
and we actually add the ordered extent we could be trying to reclaim the
inode, which makes igrab() return NULL.  So we need to do an igrab() when we
create the async extent and then drop it when we are done with it.  This
makes sure we stay pinned in memory until the ordered extent can get a
reference on it and we are good to go.  With this patch we no longer panic
in btrfs_finish_ordered_io().  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:30:53 -04:00
Josef Bacik
9c5085c147 Btrfs: implement ->show_devname
Because btrfs can remove the device that was mounted we need to have a
->show_devname so that in this case we can print out some other device in
the file system to /proc/mount.  So if there are multiple devices in a btrfs
file system we will just print the device with the lowest devid that we can
find.  This will make everything consistent and deal with device removal
properly.  The drawback is if you mount with a device that is higher than
the lowest devicd it won't show up as the mounted device in /proc/mounts,
but this is a small price to pay. This was inspired by Miao Xie's patch.
Thanks,

Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:30:37 -04:00
Josef Bacik
606686eeac Btrfs: use rcu to protect device->name
Al pointed out that we can just toss out the old name on a device and add a
new one arbitrarily, so anybody who uses device->name in printk could
possibly use free'd memory.  Instead of adding locking around all of this he
suggested doing it with RCU, so I've introduced a struct rcu_string that
does just that and have gone through and protected all accesses to
device->name that aren't under the uuid_mutex with rcu_read_lock().  This
protects us and I will use it for dealing with removing the device that we
used to mount the file system in a later patch.  Thanks,

Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:16 -04:00
Josef Bacik
17ca04aff7 Btrfs: unlock everything properly in the error case for nocow
I was getting hung on umount when a transaction was aborted because a range
of one of the free space inodes was still locked.  This is because the nocow
stuff doesn't unlock anything on error.  This fixed the problem and I
verified that is what was happening.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:15 -04:00
Josef Bacik
ee670f0af3 Btrfs: fix btrfs_destroy_marked_extents
So we're forcing the eb's to have their ref count set to 1 so invalidatepage
works but this breaks lots of things, for example root nodes, and is just
plain wrong, we don't need to just evict all of this stuff.  Also drop the
invalidatepage altogether and add a page_cache_release().  With this patch
we no longer hang when trying to access the root nodes after an aborted
transaction and we no longer leak memory.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:14 -04:00
Josef Bacik
7b8b92af58 Btrfs: abort the transaction if the commit fails
If a transaction commit fails we don't abort it so we don't set an error on
the file system.  This patch fixes that by actually calling the abort stuff
and then adding a check for a fs error in the transaction start stuff to
make sure it is caught properly.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:13 -04:00
Josef Bacik
d7096fc3ef Btrfs: wake up transaction waiters when aborting a transaction
I was getting lots of hung tasks and a NULL pointer dereference because we
are not cleaning up the transaction properly when it aborts.  First we need
to reset the running_transaction to NULL so we don't get a bad dereference
for any start_transaction callers after this.  Also we cannot rely on
waitqueue_active() since it's just a list_empty(), so just call wake_up()
directly since that will do the barrier for us and such.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:12 -04:00
Josef Bacik
b939d1ab76 Btrfs: fix locking in btrfs_destroy_delayed_refs
The transaction abort stuff was throwing warnings from the list debugging
code because we do a list_del_init outside of the delayed_refs spin lock.
The delayed refs locking makes baby Jesus cry so it's not hard to get wrong,
but we need to take the ref head mutex to make sure it's not being processed
currently, and so if it is we need to drop the spin lock and then take and
drop the mutex and do the search again.  If we can take the mutex then we
can safely remove the head from the list and carry on.  Now when the
transaction aborts I don't get the list debugging warnings.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:11 -04:00
Josef Bacik
beb42dd793 Btrfs: pass locked_page into extent_clear_unlock_delalloc if theres an error
While doing my enospc work I got a transaction abortion that resulted in a
panic when we tried to unlock_page() an already unlocked page.  This is
because we aren't calling extent_clear_unlock_delalloc with the locked page
so it was unlocking all the pages in the range.  This is wrong since
__extent_writepage expects to have the page locked still unless we return
*page_started as 1.  This should keep us from panicing.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-14 21:29:09 -04:00
J. Bruce Fields
bc2df47a40 nfsd4: BUG_ON(!is_spin_locked()) no good on UP kernels
Most frequent symptom was a BUG triggering in expire_client, with the
server locking up shortly thereafter.

Introduced by 508dc6e110 "nfsd41:
free_session/free_client must be called under the client_lock".

Cc: stable@kernel.org
Cc: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-06-14 13:54:08 -04:00
Stanislav Kinsbursky
12918b10d5 NFS: hard-code init_net for NFS callback transports
In case of destroying mount namespace on child reaper exit, nsproxy is zeroed
to the point already. So, dereferencing of it is invalid.
This patch hard-code "init_net" for all network namespace references for NFS
callback services. This will be fixed with proper NFS callback
containerization.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2012-06-14 13:53:43 -04:00
Jan Schmidt
3310c36eef Btrfs: fix race in tree mod log addition
When adding to the tree modification log, we grab two locks at different
stages. We must not drop the outer lock until we're done with section
protected by the inner lock. This moves the unlock call for the outer lock
to the appropriate position.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-14 18:52:39 +02:00
Jan Schmidt
3d7806eca4 Btrfs: add btrfs_next_old_leaf
To make sense of the tree mod log, the backref walker not only needs
btrfs_search_old_slot, but it also called btrfs_next_leaf, which in turn was
calling btrfs_search_slot. This obviously didn't give the correct result.

This commit adds btrfs_next_old_leaf, a drop-in replacement for
btrfs_next_leaf with a time_seq parameter. If it is zero, it behaves exactly
like btrfs_next_leaf. If it is non-zero, it will use btrfs_search_old_slot
with this time_seq parameter.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-14 18:52:09 +02:00
Jan Schmidt
a95236d99f Btrfs: fix return value for __tree_mod_log_oldest_root
In __tree_mod_log_oldest_root() we must return the found operation even if
it's not a ROOT_REPLACE operation. Otherwise, the caller assumes that there
are no operations to be rewinded and returns immediately.

The code in the caller is modified to improve readability.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-14 18:44:22 +02:00
Jan Schmidt
8ba97a15e7 Btrfs: use btrfs_read_lock_root_node in get_old_root
get_old_root could race with root node updates because we weren't locking
the node early enough. Use btrfs_read_lock_root_node to grab the root locked
in the very beginning and release the lock as soon as possible (just like
btrfs_search_slot does).

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-14 18:44:21 +02:00
Jan Schmidt
f617e2fd52 Btrfs: remove obsolete btrfs_next_leaf call from __resolve_indirect_ref
When resolving indirect refs, we used to call btrfs_next_leaf in case we
didn't find an exact match. While we should find exact matches most of the
time, in case we don't, we must continue searching. Treating those matches
differently depending on the level we're searching doesn't make sense.

Even worse, we might end up searching for a key larger than the largest, in
which case there is no next_leaf and subsequent jobs would fail. This commit
drops the bogous lines.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-06-14 18:44:20 +02:00
Anton Vorontsov
364ed2f465 pstore/inode: Make pstore_fill_super() static
There's no reason to extern it. The patch fixes the annoying sparse
warning:

CHECK   fs/pstore/inode.c
fs/pstore/inode.c:264:5: warning: symbol 'pstore_fill_super' was not
declared. Should it be static?

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-13 16:52:40 -07:00
Anton Vorontsov
93cce04968 pstore/ram: Should zap persistent zone on unlink
Otherwise, unlinked file will reappear on the next boot.

Reported-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-13 16:52:40 -07:00
Anton Vorontsov
fce3979304 pstore/ram_core: Factor persistent_ram_zap() out of post_init()
A handy function that we will use outside of ram_core soon. But
so far just factor it out and start using it in post_init().

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-13 16:52:40 -07:00
Anton Vorontsov
25b63da647 pstore/ram_core: Do not reset restored zone's position and size
Otherwise, the files will survive just one reboot, and on a subsequent
boot they will disappear.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-13 16:52:39 -07:00
Anton Vorontsov
201e4aca5a pstore/ram: Should update old dmesg buffer before reading
Without the update, we'll only see the new dmesg buffer after the
reboot, but previously we could see it right away. Making an oops
visible in pstore filesystem before reboot is a somewhat dubious
feature, but removing it wasn't an intentional change, so let's
restore it.

For this we have to make persistent_ram_save_old() safe for calling
multiple times, and also extern it.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-13 16:52:39 -07:00
Eric Dumazet
047fe36052 splice: fix racy pipe->buffers uses
Dave Jones reported a kernel BUG at mm/slub.c:3474! triggered
by splice_shrink_spd() called from vmsplice_to_pipe()

commit 35f3d14dbb (pipe: add support for shrinking and growing pipes)
added capability to adjust pipe->buffers.

Problem is some paths don't hold pipe mutex and assume pipe->buffers
doesn't change for their duration.

Fix this by adding nr_pages_max field in struct splice_pipe_desc, and
use it in place of pipe->buffers where appropriate.

splice_shrink_spd() loses its struct pipe_inode_info argument.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Tom Herbert <therbert@google.com>
Cc: stable <stable@vger.kernel.org> # 2.6.35
Tested-by: Dave Jones <davej@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2012-06-13 21:16:42 +02:00
Suresh Jayaraman
e73f843a32 cifs: fix parsing of password mount option
The double delimiter check that allows a comma in the password parsing code is
unconditional. We set "tmp_end" to the end of the string and we continue to
check for double delimiter. In the case where the password doesn't contain a
comma we end up setting tmp_end to NULL and eventually setting "options" to
"end". This results in the premature termination of the options string and hence
the values of UNCip and UNC are being set to NULL. This results in mount failure
with "Connecting to DFS root not implemented yet" error.

This error is usually not noticable as we have password as the last option in
the superblock mountdata. But when we call expand_dfs_referral() from
cifs_mount() and try to compose mount options for the submount, the resulting
mountdata will be of the form

   ",ver=1,user=foo,pass=bar,ip=x.x.x.x,unc=\\server\share"

and hence results in the above error. This bug has been seen with older NAS
servers running Samba 3.0.24.

Fix this by moving the double delimiter check inside the conditional loop.

Changes since -v1

   - removed the wrong strlen() micro optimization.

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.com>
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Cc: stable@vger.kernel.org [3.1+]
Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-06-12 12:53:02 -05:00
Linus Torvalds
266ae4e615 fix unbalanced wb->list_lock in 3.5-rc1
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Merge tag 'writeback-lock-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

Pull writeback locking fix from Wu Fengguang:
 "fix unbalanced wb->list_lock in 3.5-rc1"

* tag 'writeback-lock-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:
  writeback: Fix lock imbalance in writeback_sb_inodes()
2012-06-12 18:28:58 +03:00
Dan Carpenter
e216c8c771 NFS: add an endian notation for sparse
This is supposed to be a __be32 value.  Sparse complains a lot:

fs/nfs/callback_xdr.c:699:30: warning: incorrect type in initializer (different base types)
fs/nfs/callback_xdr.c:699:30:    expected unsigned int [unsigned] status
fs/nfs/callback_xdr.c:699:30:    got restricted __be32 const [usertype] csr_status
fs/nfs/callback_xdr.c:715:9: warning: cast to restricted __be32
fs/nfs/callback_xdr.c:716:16: warning: incorrect type in return expression (different base types)
fs/nfs/callback_xdr.c:716:16:    expected restricted __be32
fs/nfs/callback_xdr.c:716:16:    got unsigned int [unsigned] status

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-12 09:54:40 -04:00
Dan Carpenter
0439f31c35 NFSv4.1: integer overflow in decode_cb_sequence_args()
This seems like it could overflow on 32 bits.  Use kmalloc_array() which
has overflow protection built in.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-12 09:54:36 -04:00
Randy Dunlap
b84297197c exofs: fix sparse non-ANSI function warning
Fix sparse non-ANSI function warning:

  fs/exofs/sys.c:112:28: warning: non-ANSI function declaration of function 'exofs_sysfs_dbg_print'

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-12 06:33:22 +03:00
Andy Adamson
2669940db8 NFSv4 do not send an empty SETATTR compound
Commit 536e43d12b ATTR_OPEN check can result in
an ia_valid with only ATTR_FILE set, and no NFS_VALID_ATTRS attributes to
request from the server.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-11 17:25:53 -04:00
Sachin Prabhu
64f9a83665 NFSv2: EOF incorrectly set on short read
In cases where the server returns fewer bytes then those requested, we
can incorrectly set the eof flag for the file. Fixing this allows the
request to be retried with updated offset and count arguments.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-11 17:25:00 -04:00
Bryan Schumaker
c5afc8da5b NFS: Use the NFS_DEFAULT_VERSION for v2 and v3 mounts
Older versions of nfs utils don't always pass a "vers=" mount option for
NFS.  This chould lead to attempts at using NFS v0 due to a zeroed out
nfs_parsed_mount_data struct.  I solve this by setting the default NFS
version to NFS_DEFAULT_VERSION in the v2 and v3 cases (v4 has already been
taken care of by a similar patch).

Reported-by: Joerg Roedel <joro@&bytes.org>
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-09 14:38:59 -04:00
Fred Isaman
906369e43c NFS: fix directio refcount bug on commit
This reverts a hunk from commit 0427708657
"NFS: Clean up - Simplify reference counting in fs/nfs/direct.c"

The cleanups in that patch affect the write path, but by the time
processing hits commit the removed reference has been added back by
nfs_scan_commit_list().  Without this reversion, any page that is
sent to commit holds on to an unbalanced reference that is never
freed.  The immediate effect is an imbalance over the wire between
OPENs and CLOSEs.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-09 14:32:45 -04:00
Jan Kara
ead188f9f9 writeback: Fix lock imbalance in writeback_sb_inodes()
Fix bug introduced by 169ebd90.  We have to have wb_list_lock locked when
restarting writeback loop after having waited for inode writeback.

Bug description by Ted Tso:

  I can reproduce this fairly easily by using ext4 w/o a journal, running
  under KVM with 1024megs memory, with fsstress (xfstests #13):

  [   45.153294] =====================================
  [   45.154784] [ BUG: bad unlock balance detected! ]
  [   45.155591] 3.5.0-rc1-00002-gb22b1f1 #124 Not tainted
  [   45.155591] -------------------------------------
  [   45.155591] flush-254:16/2499 is trying to release lock (&(&wb->list_lock)->rlock) at:
  [   45.155591] [<c022c3da>] writeback_sb_inodes+0x160/0x327
  [   45.155591] but there are no more locks to release!

Reported-by: Theodore Ts'o <tytso@mit.edu>
Tested-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
2012-06-09 08:32:15 +09:00
Linus Torvalds
77249539cd ext4 bug fixes for 3.5-rc2
This update contains two bug fixes, both destined for the stable tree.
 Perhaps the most important is one which fixes ext4 when used with file
 systems originally formatted for use with ext3, but then later
 converted to take advantage of ext4.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 bug fixes from Theodore Ts'o:
 "This update contains two bug fixes, both destined for the stable tree.
  Perhaps the most important is one which fixes ext4 when used with file
  systems originally formatted for use with ext3, but then later
  converted to take advantage of ext4."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: don't set i_flags in EXT4_IOC_SETFLAGS
  ext4: fix the free blocks calculation for ext3 file systems w/ uninit_bg
2012-06-08 11:15:31 -07:00
Linus Torvalds
e72643088f Fix UBI and UBIFS - they refuse to work without debugfs. This was
broken by the 3.5-rc1 UBI/UBIFS changes when we removed the debugging
 Kconfig switches.
 
 Also, correct locking in 'ubi_wl_flush()' - it was extended to support
 flushing a specific LEB in 3.5-rc1, and the locking was sub-optimal.
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Merge tag 'upstream-3.5-rc2' of git://git.infradead.org/linux-ubifs

Pull UBI/UBIFS fixes from Artem Bityutskiy:
 "Fix UBI and UBIFS - they refuse to work without debugfs.  This was
  broken by the 3.5-rc1 UBI/UBIFS changes when we removed the debugging
  Kconfig switches.

  Also, correct locking in 'ubi_wl_flush()' - it was extended to support
  flushing a specific LEB in 3.5-rc1, and the locking was sub-optimal."

* tag 'upstream-3.5-rc2' of git://git.infradead.org/linux-ubifs:
  UBI: correct ubi_wl_flush locking
  UBIFS: fix debugfs-less systems support
  UBI: fix debugfs-less systems support
2012-06-08 11:04:06 -07:00
Linus Torvalds
32ba9c3fca Revert "vfs: stop d_splice_alias creating directory aliases"
This reverts commit 7732a557b1 (and commit
3f50fff4da, which was a follow-up
cleanup).

We're chasing an elusive bug that Dave Jones can apparently reproduce
using his system call fuzzer tool, and that looks like some kind of
locking ordering problem on the directory i_mutex chain.  Our i_mutex
locking is rather complex, and depends on the topological ordering of
the directories, which is why we have been very wary of splicing
directory entries around.

Of course, we really don't want to ever see aliased unconnected
directories anyway, so none of this should ever happen, but this revert
aims to basically get us back to a known older state.

Bruce points to some of the previous discussion at

       http://marc.info/?i=<20110310105821.GE22723@ZenIV.linux.org.uk>

and in particular a long post from Neil:

       http://marc.info/?i=<20110311150749.2fa2be66@notabene.brown>

It should be noted that it's possible that Dave's problems come from
other changes altohgether, including possibly just the fact that Dave
constantly is teachning his fuzzer new tricks.  So what appears to be a
new bug could in fact be an old one that just gets newly triggered, but
reverting these patches as "still under heavy discussion" is the right
thing regardless.

Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-08 10:34:03 -07:00
Trond Myklebust
2d0dbc6ae8 NFSv4: Fix unnecessary delegation returns in nfs4_do_open
While nfs4_do_open() expects the fmode argument to be restricted to
combinations of FMODE_READ and FMODE_WRITE, both nfs4_atomic_open()
and nfs4_proc_create will pass the nfs_open_context->mode,
which contains the full fmode_t.

This patch ensures that nfs4_do_open strips the other fmode_t bits,
fixing a problem in which the nfs4_do_open call would result in an
unnecessary delegation return.

Reported-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
2012-06-08 11:08:42 -04:00
Linus Torvalds
48d212a2ee Revert "mm: correctly synchronize rss-counters at exit/exec"
This reverts commit 40af1bbdca.

It's horribly and utterly broken for at least the following reasons:

 - calling sync_mm_rss() from mmput() is fundamentally wrong, because
   there's absolutely no reason to believe that the task that does the
   mmput() always does it on its own VM.  Example: fork, ptrace, /proc -
   you name it.

 - calling it *after* having done mmdrop() on it is doubly insane, since
   the mm struct may well be gone now.

 - testing mm against NULL before you call it is insane too, since a
NULL mm there would have caused oopses long before.

.. and those are just the three bugs I found before I decided to give up
looking for me and revert it asap.  I should have caught it before I
even took it, but I trusted Andrew too much.

Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-07 17:54:07 -07:00
Tao Ma
b22b1f178f ext4: don't set i_flags in EXT4_IOC_SETFLAGS
Commit 7990696 uses the ext4_{set,clear}_inode_flags() functions to
change the i_flags automatically but fails to remove the error setting
of i_flags.  So we still have the problem of trashing state flags.
Fix this by removing the assignment.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
2012-06-07 19:04:19 -04:00
Theodore Ts'o
b0dd6b70f0 ext4: fix the free blocks calculation for ext3 file systems w/ uninit_bg
Ext3 filesystems that are converted to use as many ext4 file system
features as possible will enable uninit_bg to speed up e2fsck times.
These file systems will have a native ext3 layout of inode tables and
block allocation bitmaps (as opposed to ext4's flex_bg layout).
Unfortunately, in these cases, when first allocating a block in an
uninitialized block group, ext4 would incorrectly calculate the number
of free blocks in that block group, and then errorneously report that
the file system was corrupt:

EXT4-fs error (device vdd): ext4_mb_generate_buddy:741: group 30, 32254 clusters in bitmap, 32258 in gd

This problem can be reproduced via:

    mke2fs -q -t ext4 -O ^flex_bg /dev/vdd 5g
    mount -t ext4 /dev/vdd /mnt
    fallocate -l 4600m /mnt/test

The problem was caused by a bone headed mistake in the check to see if a
particular metadata block was part of the block group.

Many thanks to Kees Cook for finding and bisecting the buggy commit
which introduced this bug (commit fd034a84e1, present since v3.2).

Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Reported-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: stable@kernel.org
2012-06-07 18:56:06 -04:00
Konstantin Khlebnikov
40af1bbdca mm: correctly synchronize rss-counters at exit/exec
mm->rss_stat counters have per-task delta: task->rss_stat.  Before
changing task->mm pointer the kernel must flush this delta with
sync_mm_rss().

do_exit() already calls sync_mm_rss() to flush the rss-counters before
committing the rss statistics into task->signal->maxrss, taskstats,
audit and other stuff.  Unfortunately the kernel does this before
calling mm_release(), which can call put_user() for processing
task->clear_child_tid.  So at this point we can trigger page-faults and
task->rss_stat becomes non-zero again.  As a result mm->rss_stat becomes
inconsistent and check_mm() will print something like this:

| BUG: Bad rss-counter state mm:ffff88020813c380 idx:1 val:-1
| BUG: Bad rss-counter state mm:ffff88020813c380 idx:2 val:1

This patch moves sync_mm_rss() into mm_release(), and moves mm_release()
out of do_exit() and calls it earlier.  After mm_release() there should
be no pagefaults.

[akpm@linux-foundation.org: tweak comment]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org>		[3.4.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-07 14:43:55 -07:00
Trond Myklebust
02c67525cf NFSv4.1: Convert another trivial printk into a dprintk
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-07 13:45:53 -04:00
Fred Isaman
fb47ddc9d5 NFS4: Fix open bug when pnfs module blacklisted
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-07 13:44:24 -04:00
Trond Myklebust
f07936f2c4 NFS: Remove incorrect BUG_ON in nfs_found_client
It is perfectly valid for nfs_get_client() to return a nfs_client that
is in the process of setting up the NFSv4.1 session.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-07 10:21:03 -04:00
Artem Bityutskiy
818039c7d5 UBIFS: fix debugfs-less systems support
Commit "f70b7e5 UBIFS: remove Kconfig debugging option" broke UBIFS and it
refuses to initialize if debugfs (CONFIG_DEBUG_FS) is disabled. I incorrectly
assumed that debugfs files creation function will return success if debugfs
is disabled, but they actually return -ENODEV. This patch fixes the issue.

Reported-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Tested-by: Paul Parsons <lost.distance@yahoo.com>
2012-06-07 10:43:54 +03:00
Steve Dickson
f25efd851c NFS: Map minor mismatch error to protocol not support error.
Sservers that only have NFSv4.1 support the
NFS4ERR_MINOR_VERS_MISMATCH error is return on
v4.0 mounts. Mapping that error to EPROTONOSUPPORT
will cause the mount to back off to v3 instead of
failing.

Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-06-06 14:32:40 -04:00
Trond Myklebust
9bce008bae NFS: Fix a commit bug
The new commit code fails to copy the verifier into the wb_verf field
of _all_ the nfs_page structures; it only copies it into the first entry.
The consequence is that most requests end up failing to match in
nfs_commit_release.

Fix is to copy the verifier into the req->wb_verf field in
nfs_write_completion.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>
2012-06-05 18:38:47 -04:00