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  1. 28 6月, 2013 1 次提交
  3. 02 2月, 2013 9 次提交
  5. 31 7月, 2012 1 次提交
    • J
      xfs: Convert to new freezing code · d9457dc0
      由 Jan Kara 提交于 
      Generic code now blocks all writers from standard write paths. So we add
blocking of all writers coming from ioctl (we get a protection of ioctl against
racing remount read-only as a bonus) and convert xfs_file_aio_write() to a
non-racy freeze protection. We also keep freeze protection on transaction
start to block internal filesystem writes such as removal of preallocated
blocks.

CC: Ben Myers <bpm@sgi.com>
CC: Alex Elder <elder@kernel.org>
CC: xfs@oss.sgi.com
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      d9457dc0
  7. 30 5月, 2012 1 次提交
  9. 15 5月, 2012 4 次提交
  11. 23 2月, 2012 1 次提交
  13. 14 2月, 2012 2 次提交
  15. 09 12月, 2011 3 次提交
  17. 12 10月, 2011 2 次提交
    • C
      xfs: simplify xfs_trans_ijoin* again · ddc3415a
      由 Christoph Hellwig 提交于 
      There is no reason to keep a reference to the inode even if we unlock
it during transaction commit because we never drop a reference between
the ijoin and commit.  Also use this fact to merge xfs_trans_ijoin_ref
back into xfs_trans_ijoin - the third argument decides if an unlock
is needed now.

I'm actually starting to wonder if allowing inodes to be unlocked
at transaction commit really is worth the effort.  The only real
benefit is that they can be unlocked earlier when commiting a
synchronous transactions, but that could be solved by doing the
log force manually after the unlock, too.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAlex Elder <aelder@sgi.com>
      ddc3415a
    • C
      xfs: unlock the inode before log force in xfs_fsync · b1037058
      由 Christoph Hellwig 提交于 
      Only read the LSN we need to push to with the ilock held, and then release
it before we do the log force to improve concurrency.

This also removes the only direct caller of _xfs_trans_commit, thus
allowing it to be merged into the plain xfs_trans_commit again.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAlex Elder <aelder@sgi.com>
      b1037058
  19. 21 7月, 2011 1 次提交
    • D
      xfs: use a cursor for bulk AIL insertion · 1d8c95a3
      由 Dave Chinner 提交于 
      Delayed logging can insert tens of thousands of log items into the
AIL at the same LSN. When the committing of log commit records
occur, we can get insertions occurring at an LSN that is not at the
end of the AIL. If there are thousands of items in the AIL on the
tail LSN, each insertion has to walk the AIL to find the correct
place to insert the new item into the AIL. This can consume large
amounts of CPU time and block other operations from occurring while
the traversals are in progress.

To avoid this repeated walk, use a AIL cursor to record
where we should be inserting the new items into the AIL without
having to repeat the walk. The cursor infrastructure already
provides this functionality for push walks, so is a simple extension
of existing code. While this will not avoid the initial walk, it
will avoid repeating it tens of thousands of times during a single
checkpoint commit.

This version includes logic improvements from Christoph Hellwig.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAlex Elder <aelder@sgi.com>
      1d8c95a3
  21. 11 7月, 2011 1 次提交
  23. 08 7月, 2011 1 次提交
  25. 07 7月, 2011 1 次提交
    • D
      xfs: unpin stale inodes directly in IOP_COMMITTED · 1316d4da
      由 Dave Chinner 提交于 
      When inodes are marked stale in a transaction, they are treated
specially when the inode log item is being inserted into the AIL.
It tries to avoid moving the log item forward in the AIL due to a
race condition with the writing the underlying buffer back to disk.
The was "fixed" in commit de25c181 ("xfs: avoid moving stale inodes
in the AIL").

To avoid moving the item forward, we return a LSN smaller than the
commit_lsn of the completing transaction, thereby trying to trick
the commit code into not moving the inode forward at all. I'm not
sure this ever worked as intended - it assumes the inode is already
in the AIL, but I don't think the returned LSN would have been small
enough to prevent moving the inode. It appears that the reason it
worked is that the lower LSN of the inodes meant they were inserted
into the AIL and flushed before the inode buffer (which was moved to
the commit_lsn of the transaction).

The big problem is that with delayed logging, the returning of the
different LSN means insertion takes the slow, non-bulk path.  Worse
yet is that insertion is to a position -before- the commit_lsn so it
is doing a AIL traversal on every insertion, and has to walk over
all the items that have already been inserted into the AIL. It's
expensive.

To compound the matter further, with delayed logging inodes are
likely to go from clean to stale in a single checkpoint, which means
they aren't even in the AIL at all when we come across them at AIL
insertion time. Hence these were all getting inserted into the AIL
when they simply do not need to be as inodes marked XFS_ISTALE are
never written back.

Transactional/recovery integrity is maintained in this case by the
other items in the unlink transaction that were modified (e.g. the
AGI btree blocks) and committed in the same checkpoint.

So to fix this, simply unpin the stale inodes directly in
xfs_inode_item_committed() and return -1 to indicate that the AIL
insertion code does not need to do any further processing of these
inodes.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAlex Elder <aelder@sgi.com>
      1316d4da
  27. 25 5月, 2011 1 次提交
    • C
      xfs: add online discard support · e84661aa
      由 Christoph Hellwig 提交于 
      Now that we have reliably tracking of deleted extents in a
transaction we can easily implement "online" discard support
which calls blkdev_issue_discard once a transaction commits.

The actual discard is a two stage operation as we first have
to mark the busy extent as not available for reuse before we
can start the actual discard.  Note that we don't bother
supporting discard for the non-delaylog mode.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAlex Elder <aelder@sgi.com>
      e84661aa
  29. 29 4月, 2011 1 次提交
  31. 28 1月, 2011 2 次提交
    • D
      xfs: handle CIl transaction commit failures correctly · c6f990d1
      由 Dave Chinner 提交于 
      Failure to commit a transaction into the CIL is not handled
correctly. This currently can only happen when racing with a
shutdown and requires an explicit shutdown check, so it rare and can
be avoided. Remove the shutdown check and make the CIL commit a void
function to indicate it will always succeed, thereby removing the
incorrectly handled failure case.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NAlex Elder <aelder@sgi.com>
      c6f990d1
    • D
      xfs: fix efi item leak on forced shutdown · e34a314c
      由 Dave Chinner 提交于 
      After test 139, kmemleak shows:

unreferenced object 0xffff880078b405d8 (size 400):
  comm "xfs_io", pid 4904, jiffies 4294909383 (age 1186.728s)
  hex dump (first 32 bytes):
    60 c1 17 79 00 88 ff ff 60 c1 17 79 00 88 ff ff  `..y....`..y....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81afb04d>] kmemleak_alloc+0x2d/0x60
    [<ffffffff8115c6cf>] kmem_cache_alloc+0x13f/0x2b0
    [<ffffffff814aaa97>] kmem_zone_alloc+0x77/0xf0
    [<ffffffff814aab2e>] kmem_zone_zalloc+0x1e/0x50
    [<ffffffff8147cd6b>] xfs_efi_init+0x4b/0xb0
    [<ffffffff814a4ee8>] xfs_trans_get_efi+0x58/0x90
    [<ffffffff81455fab>] xfs_bmap_finish+0x8b/0x1d0
    [<ffffffff814851b4>] xfs_itruncate_finish+0x2c4/0x5d0
    [<ffffffff814a970f>] xfs_setattr+0x8df/0xa70
    [<ffffffff814b5c7b>] xfs_vn_setattr+0x1b/0x20
    [<ffffffff8117dc00>] notify_change+0x170/0x2e0
    [<ffffffff81163bf6>] do_truncate+0x66/0xa0
    [<ffffffff81163d0b>] sys_ftruncate+0xdb/0xe0
    [<ffffffff8103a002>] system_call_fastpath+0x16/0x1b
    [<ffffffffffffffff>] 0xffffffffffffffff

The cause of the leak is that the "remove" parameter of IOP_UNPIN()
is never set when a CIL push is aborted. This means that the EFI
item is never freed if it was in the push being cancelled. The
problem is specific to delayed logging, but has uncovered a couple
of problems with the handling of IOP_UNPIN(remove).

Firstly, we cannot safely call xfs_trans_del_item() from IOP_UNPIN()
in the CIL commit failure path or the iclog write failure path
because for delayed loging we have no transaction context. Hence we
must only call xfs_trans_del_item() if the log item being unpinned
has an active log item descriptor.

Secondly, xfs_trans_uncommit() does not handle log item descriptor
freeing during the traversal of log items on a transaction. It can
reference a freed log item descriptor when unpinning an EFI item.
Hence it needs to use a safe list traversal method to allow items to
be removed from the transaction during IOP_UNPIN().
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NAlex Elder <aelder@sgi.com>
      e34a314c
  33. 12 1月, 2011 1 次提交
  35. 20 12月, 2010 1 次提交
    • D
      xfs: bulk AIL insertion during transaction commit · 0e57f6a3
      由 Dave Chinner 提交于 
      When inserting items into the AIL from the transaction committed
callbacks, we take the AIL lock for every single item that is to be
inserted. For a CIL checkpoint commit, this can be tens of thousands
of individual inserts, yet almost all of the items will be inserted
at the same point in the AIL because they have the same index.

To reduce the overhead and contention on the AIL lock for such
operations, introduce a "bulk insert" operation which allows a list
of log items with the same LSN to be inserted in a single operation
via a list splice. To do this, we need to pre-sort the log items
being committed into a temporary list for insertion.

The complexity is that not every log item will end up with the same
LSN, and not every item is actually inserted into the AIL. Items
that don't match the commit LSN will be inserted and unpinned as per
the current one-at-a-time method (relatively rare), while items that
are not to be inserted will be unpinned and freed immediately. Items
that are to be inserted at the given commit lsn are placed in a
temporary array and inserted into the AIL in bulk each time the
array fills up.

As a result of this, we trade off AIL hold time for a significant
reduction in traffic. lock_stat output shows that the worst case
hold time is unchanged, but contention from AIL inserts drops by an
order of magnitude and the number of lock traversal decreases
significantly.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
      0e57f6a3
  37. 19 10月, 2010 4 次提交
  39. 24 8月, 2010 1 次提交
    • D
      xfs: unlock items before allowing the CIL to commit · d17c701c
      由 Dave Chinner 提交于 
      When we commit a transaction using delayed logging, we need to
unlock the items in the transaciton before we unlock the CIL context
and allow it to be checkpointed. If we unlock them after we release
the CIl context lock, the CIL can checkpoint and complete before
we free the log items. This breaks stale buffer item unlock and
unpin processing as there is an implicit assumption that the unlock
will occur before the unpin.

Also, some log items need to store the LSN of the transaction commit
in the item (inodes and EFIs) and so can race with other transaction
completions if we don't prevent the CIL from checkpointing before
the unlock occurs.

Cc: <stable@kernel.org>
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
      d17c701c
  41. 27 7月, 2010 1 次提交
    • D
      xfs: fix xfs_trans_add_item() lockdep warnings · 43869706
      由 Dave Chinner 提交于 
      xfs_trans_add_item() is called with ip->i_ilock held, which means it
is unsafe for memory reclaim to recurse back into the filesystem
(ilock is required in writeback). Hence the allocation needs to be
KM_NOFS to avoid recursion.

Lockdep report indicating memory allocation being called with the
ip->i_ilock held is as follows:

[ 1749.866796] =================================
[ 1749.867788] [ INFO: inconsistent lock state ]
[ 1749.868327] 2.6.35-rc3-dgc+ #25
[ 1749.868741] ---------------------------------
[ 1749.868741] inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
[ 1749.868741] dd/2835 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 1749.868741]  (&(&ip->i_lock)->mr_lock){++++?.}, at: [<ffffffff813170fb>] xfs_ilock+0x10b/0x190
[ 1749.868741] {IN-RECLAIM_FS-W} state was registered at:
[ 1749.868741]   [<ffffffff810b3a97>] __lock_acquire+0x437/0x1450
[ 1749.868741]   [<ffffffff810b4b56>] lock_acquire+0xa6/0x160
[ 1749.868741]   [<ffffffff810a20b5>] down_write_nested+0x65/0xb0
[ 1749.868741]   [<ffffffff813170fb>] xfs_ilock+0x10b/0x190
[ 1749.868741]   [<ffffffff8134e819>] xfs_reclaim_inode+0x99/0x310
[ 1749.868741]   [<ffffffff8134f56b>] xfs_inode_ag_walk+0x8b/0x150
[ 1749.868741]   [<ffffffff8134f6bb>] xfs_inode_ag_iterator+0x8b/0xf0
[ 1749.868741]   [<ffffffff8134f7a8>] xfs_reclaim_inode_shrink+0x88/0x90
[ 1749.868741]   [<ffffffff81119d07>] shrink_slab+0x137/0x1a0
[ 1749.868741]   [<ffffffff8111bbe1>] balance_pgdat+0x421/0x6a0
[ 1749.868741]   [<ffffffff8111bf7d>] kswapd+0x11d/0x320
[ 1749.868741]   [<ffffffff8109ce56>] kthread+0x96/0xa0
[ 1749.868741]   [<ffffffff81035de4>] kernel_thread_helper+0x4/0x10
[ 1749.868741] irq event stamp: 4234335
[ 1749.868741] hardirqs last  enabled at (4234335): [<ffffffff81147d25>] kmem_cache_free+0x115/0x220
[ 1749.868741] hardirqs last disabled at (4234334): [<ffffffff81147c4d>] kmem_cache_free+0x3d/0x220
[ 1749.868741] softirqs last  enabled at (4233112): [<ffffffff81084dd2>] __do_softirq+0x142/0x260
[ 1749.868741] softirqs last disabled at (4233095): [<ffffffff81035edc>] call_softirq+0x1c/0x50
[ 1749.868741] 
[ 1749.868741] other info that might help us debug this:
[ 1749.868741] 2 locks held by dd/2835:
[ 1749.868741]  #0:  (&(&ip->i_iolock)->mr_lock#2){+.+.+.}, at: [<ffffffff81316edd>] xfs_ilock_nowait+0xed/0x200
[ 1749.868741]  #1:  (&(&ip->i_lock)->mr_lock){++++?.}, at: [<ffffffff813170fb>] xfs_ilock+0x10b/0x190
[ 1749.868741] 
[ 1749.868741] stack backtrace:
[ 1749.868741] Pid: 2835, comm: dd Not tainted 2.6.35-rc3-dgc+ #25
[ 1749.868741] Call Trace:
[ 1749.868741]  [<ffffffff810b1faa>] print_usage_bug+0x18a/0x190
[ 1749.868741]  [<ffffffff8104264f>] ? save_stack_trace+0x2f/0x50
[ 1749.868741]  [<ffffffff810b2400>] ? check_usage_backwards+0x0/0xf0
[ 1749.868741]  [<ffffffff810b2f11>] mark_lock+0x331/0x400
[ 1749.868741]  [<ffffffff810b3047>] mark_held_locks+0x67/0x90
[ 1749.868741]  [<ffffffff810b3111>] lockdep_trace_alloc+0xa1/0xe0
[ 1749.868741]  [<ffffffff81147419>] kmem_cache_alloc+0x39/0x1e0
[ 1749.868741]  [<ffffffff8133f954>] kmem_zone_alloc+0x94/0xe0
[ 1749.868741]  [<ffffffff8133f9be>] kmem_zone_zalloc+0x1e/0x50
[ 1749.868741]  [<ffffffff81335f02>] xfs_trans_add_item+0x72/0xb0
[ 1749.868741]  [<ffffffff81339e41>] xfs_trans_ijoin+0xa1/0xd0
[ 1749.868741]  [<ffffffff81319f82>] xfs_itruncate_finish+0x312/0x5d0
[ 1749.868741]  [<ffffffff8133cb87>] xfs_free_eofblocks+0x227/0x280
[ 1749.868741]  [<ffffffff8133cd18>] xfs_release+0x138/0x190
[ 1749.868741]  [<ffffffff813464c5>] xfs_file_release+0x15/0x20
[ 1749.868741]  [<ffffffff81150ebf>] fput+0x13f/0x260
[ 1749.868741]  [<ffffffff8114d8c2>] filp_close+0x52/0x80
[ 1749.868741]  [<ffffffff8114d9a9>] sys_close+0xb9/0x120
[ 1749.868741]  [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NAlex Elder <aelder@sgi.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>
      43869706