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commit 8cfcc3e565bf15870efe801368a25ca98092e6e7
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Wed May 7 08:05:52 2014 +1000
xfs: fix directory readahead offset off-by-one
Directory readahead can throw loud scary but harmless warnings
when multiblock directories are in use a specific pattern of
discontiguous blocks are found in the directory. That is, if a hole
follows a discontiguous block, it will throw a warning like:
XFS (dm-1): xfs_da_do_buf: bno 637 dir: inode 34363923462
XFS (dm-1): [00] br_startoff 637 br_startblock 1917954575 br_blockcount 1 br_state 0
XFS (dm-1): [01] br_startoff 638 br_startblock -2 br_blockcount 1 br_state 0
And dump a stack trace.
This is because the readahead offset increment loop does a double
increment of the block index - it does an increment for the loop
iteration as well as increase the loop counter by the number of
blocks in the extent. As a result, the readahead offset does not get
incremented correctly for discontiguous blocks and hence can ask for
readahead of a directory block from an offset part way through a
directory block. If that directory block is followed by a hole, it
will trigger a mapping warning like the above.
The bad readahead will be ignored, though, because the main
directory block read loop uses the correct mapping offsets rather
than the readahead offset and so will ignore the bad readahead
altogether.
Fix the warning by ensuring that the readahead offset is correctly
incremented.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit ac983517ec5941da0c58cacdbad10a231dc4e001
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Wed May 7 08:05:50 2014 +1000
xfs: don't sleep in xlog_cil_force_lsn on shutdown
Reports of a shutdown hang when fsyncing a directory have surfaced,
such as this:
[ 3663.394472] Call Trace:
[ 3663.397199] [<ffffffff815f1889>] schedule+0x29/0x70
[ 3663.402743] [<ffffffffa01feda5>] xlog_cil_force_lsn+0x185/0x1a0 [xfs]
[ 3663.416249] [<ffffffffa01fd3af>] _xfs_log_force_lsn+0x6f/0x2f0 [xfs]
[ 3663.429271] [<ffffffffa01a339d>] xfs_dir_fsync+0x7d/0xe0 [xfs]
[ 3663.435873] [<ffffffff811df8c5>] do_fsync+0x65/0xa0
[ 3663.441408] [<ffffffff811dfbc0>] SyS_fsync+0x10/0x20
[ 3663.447043] [<ffffffff815fc7d9>] system_call_fastpath+0x16/0x1b
If we trigger a shutdown in xlog_cil_push() from xlog_write(), we
will never wake waiters on the current push sequence number, so
anything waiting in xlog_cil_force_lsn() for that push sequence
number to come up will not get woken and hence stall the shutdown.
Fix this by ensuring we call wake_up_all(&cil->xc_commit_wait) in
the push abort handling, in the log shutdown code when waking all
waiters, and adding a shutdown check in the sequence completion wait
loops to ensure they abort when a wakeup due to a shutdown occurs.
Reported-by: Boris Ranto <branto@xxxxxxxxxx>
Reported-by: Eric Sandeen <esandeen@xxxxxxxxxx>
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit 49abc3a8f84146f74daadbaa7cde7d34f2bb40a8
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Wed May 7 08:05:45 2014 +1000
xfs: truncate_setsize should be outside transactions
truncate_setsize() removes pages from the page cache, and hence
requires page locks to be held. It is not valid to lock a page cache
page inside a transaction context as we can hold page locks when we
we reserve space for a transaction. If we do, then we expose an ABBA
deadlock between log space reservation and page locks.
That is, both the write path and writeback lock a page, then start a
transaction for block allocation, which means they can block waiting
for a log reservation with the page lock held. If we hold a log
reservation and then do something that locks a page (e.g.
truncate_setsize in xfs_setattr_size) then that page lock can block
on the page locked and waiting for a log reservation. If the
transaction that is waiting for the page lock is the only active
transaction in the system that can free log space via a commit,
then writeback will never make progress and so log space will never
free up.
This issue with xfs_setattr_size() was introduced back in 2010 by
commit fa9b227 ("xfs: new truncate sequence") which moved the page
cache truncate from outside the transaction context (what was
xfs_itruncate_data()) to inside the transaction context as a call to
truncate_setsize().
The reason truncate_setsize() was located where in this place was
that we can't shouldn't change the file size until after we are in
the transaction context and the operation will either succeed or
shut down the filesystem on failure. However, block_truncate_page()
already modifies the file contents before we enter the transaction
context, so we can't really fulfill this guarantee in any way. Hence
we may as well ensure that on success or failure, the in-memory
inode and data is truncated away and that the application cleans up
the mess appropriately.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit b28fd7b5fe232d7643d7c0595938e998ceb58508
Author: From: Tuomas Tynkkynen <tuomas.tynkkynen@xxxxxx>
Date: Mon May 5 17:30:20 2014 +1000
xfs: Fix wrong error codes being returned
xfs_{compat_,}attrmulti_by_handle could return an errno with incorrect
sign in some cases. While at it, make sure ENOMEM is returned instead of
E2BIG if kmalloc fails.
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@xxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit 3c353375761d81abfb66eb054aacceef31658e24
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Mon May 5 17:30:15 2014 +1000
xfs: remove dquot hints
group and project quota hints are currently stored on the user
dquot. If we are attaching quotas to the inode, then the group and
project dquots are stored as hints on the user dquot to save having
to look them up again later.
The thing is, the hints are not used for that inode for the rest of
the life of the inode - the dquots are attached directly to the
inode itself - so the only time the hints are used is when an inode
first has dquots attached.
When the hints on the user dquot don't match the dquots being
attache dto the inode, they are then removed and replaced with the
new hints. If a user is concurrently modifying files in different
group and/or project contexts, then this leads to thrashing of the
hints attached to user dquot.
If user quotas are not enabled, then hints are never even used.
So, if the hints are used to avoid the cost of the lookup, is the
cost of the lookup significant enough to justify the hint
infrstructure? Maybe it was once, when there was a global quota
manager shared between all XFS filesystems and was hash table based.
However, lookups are now much simpler, requiring only a single lock and
radix tree lookup local to the filesystem and no hash or LRU
manipulations to be made. Hence the cost of lookup is much lower
than when hints were implemented. Turns out that benchmarks show
that, too, with thir being no differnce in performance when doing
file creation workloads as a single user with user, group and
project quotas enabled - the hints do not make the code go any
faster. In fact, removing the hints shows a 2-3% reduction in the
time it takes to create 50 million inodes....
So, let's just get rid of the hints and the complexity around them.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit f58522c5a47a1862c6b3fad97ea9285c5d68199d
Author: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Mon May 5 17:27:06 2014 +1000
xfs: bulletfproof xfs_qm_scall_trunc_qfiles()
Coverity noticed that if we sent junk into
xfs_qm_scall_trunc_qfiles(), we could get back an
uninitialized error value. So sanitize the flags we
will accept, and initialize error anyway for good measure.
(This bug may have been introduced via c61a9e39).
Should resolve Coverity CID 1163872.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
commit 9da93f9b7cdf8ab28da6b364cdc1fafc8670b4dc
Author: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon May 5 17:25:50 2014 +1000
xfs: fix Q_XQUOTARM ioctl
The Q_XQUOTARM quotactl was not working properly, because
we weren't passing around proper flags. The xfs_fs_set_xstate()
ioctl handler used the same flags for Q_XQUOTAON/OFF as
well as for Q_XQUOTARM, but Q_XQUOTAON/OFF look for
XFS_UQUOTA_ACCT, XFS_UQUOTA_ENFD, XFS_GQUOTA_ACCT etc,
i.e. quota type + state, while Q_XQUOTARM looks only for
the type of quota, i.e. XFS_DQ_USER, XFS_DQ_GROUP etc.
Unfortunately these flag spaces overlap a bit, so we
got semi-random results for Q_XQUOTARM; i.e. the value
for XFS_DQ_USER == XFS_UQUOTA_ACCT, etc. yeargh.
Add a new quotactl op vector specifically for the QUOTARM
operation, since it operates with a different flag space.
This has been broken more or less forever, AFAICT.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Acked-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
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