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| author | David Jeffery <djeffery@redhat.com> | 2015-08-28 14:50:45 +1000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-10-13 03:46:07 +0100 |
| commit | ff8c37e67a9b4a8e8442c601fc2a557f58d99c2c (patch) | |
| tree | 04e9af2485355f630f8358615df59b2b219d87fe | |
| parent | b0e0b3d02b17bdcdfeef2fc96d6a3e76c76bb153 (diff) | |
| download | kernel_samsung_smdk4412-ff8c37e67a9b4a8e8442c601fc2a557f58d99c2c.zip kernel_samsung_smdk4412-ff8c37e67a9b4a8e8442c601fc2a557f58d99c2c.tar.gz kernel_samsung_smdk4412-ff8c37e67a9b4a8e8442c601fc2a557f58d99c2c.tar.bz2 | |
xfs: return errors from partial I/O failures to files
commit c9eb256eda4420c06bb10f5e8fbdbe1a34bc98e0 upstream.
There is an issue with xfs's error reporting in some cases of I/O partially
failing and partially succeeding. Calls like fsync() can report success even
though not all I/O was successful in partial-failure cases such as one disk of
a RAID0 array being offline.
The issue can occur when there are more than one bio per xfs_ioend struct.
Each call to xfs_end_bio() for a bio completing will write a value to
ioend->io_error. If a successful bio completes after any failed bio, no
error is reported do to it writing 0 over the error code set by any failed bio.
The I/O error information is now lost and when the ioend is completed
only success is reported back up the filesystem stack.
xfs_end_bio() should only set ioend->io_error in the case of BIO_UPTODATE
being clear. ioend->io_error is initialized to 0 at allocation so only needs
to be updated by a failed bio. Also check that ioend->io_error is 0 so that
the first error reported will be the error code returned.
Signed-off-by: David Jeffery <djeffery@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | fs/xfs/xfs_aops.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index b367581..c2b06d4 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -365,7 +365,8 @@ xfs_end_bio( xfs_ioend_t *ioend = bio->bi_private; ASSERT(atomic_read(&bio->bi_cnt) >= 1); - ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; + if (!ioend->io_error && !test_bit(BIO_UPTODATE, &bio->bi_flags)) + ioend->io_error = error; /* Toss bio and pass work off to an xfsdatad thread */ bio->bi_private = NULL; |