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xfs: uncached buffer reads need to return an error

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With verification being done as an IO completion callback, different
errors can be returned from a read. Uncached reads only return a
buffer or NULL on failure, which means the verification error cannot
be returned to the caller.

Split the error handling for these reads into two - a failure to get
a buffer will still return NULL, but a read error will return a
referenced buffer with b_error set rather than NULL. The caller is
responsible for checking the error state of the buffer returned.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-11-12 22:54:02 +11:00 committed by Ben Myers
parent c3f8fc73ac
commit eab4e63368
4 changed files with 21 additions and 8 deletions
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9
fs/xfs/xfs_buf.c
View file

@ -715,8 +715,7 @@ xfs_buf_read_uncached(
int flags,
xfs_buf_iodone_t verify)
{
xfs_buf_t *bp;
int error;
struct xfs_buf *bp;
bp = xfs_buf_get_uncached(target, numblks, flags);
if (!bp)
@ -730,11 +729,7 @@ xfs_buf_read_uncached(
bp->b_iodone = verify;
xfsbdstrat(target->bt_mount, bp);
error = xfs_buf_iowait(bp);
if (error) {
xfs_buf_relse(bp);
return NULL;
}
xfs_buf_iowait(bp);
return bp;
}

5
fs/xfs/xfs_fsops.c
View file

@ -171,6 +171,11 @@ xfs_growfs_data_private(
XFS_FSS_TO_BB(mp, 1), 0, NULL);
if (!bp)
return EIO;
if (bp->b_error) {
int error = bp->b_error;
xfs_buf_relse(bp);
return error;
}
xfs_buf_relse(bp);
new = nb; /* use new as a temporary here */

6
fs/xfs/xfs_mount.c
View file

@ -658,6 +658,12 @@ xfs_readsb(xfs_mount_t *mp, int flags)
xfs_warn(mp, "SB buffer read failed");
return EIO;
}
if (bp->b_error) {
error = bp->b_error;
if (loud)
xfs_warn(mp, "SB validate failed");
goto release_buf;
}
/*
* Initialize the mount structure from the superblock.

9
fs/xfs/xfs_rtalloc.c
View file

@ -1876,6 +1876,11 @@ xfs_growfs_rt(
XFS_FSB_TO_BB(mp, 1), 0, NULL);
if (!bp)
return EIO;
if (bp->b_error) {
error = bp->b_error;
xfs_buf_relse(bp);
return error;
}
xfs_buf_relse(bp);
/*
@ -2221,8 +2226,10 @@ xfs_rtmount_init(
bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
XFS_FSB_TO_BB(mp, 1), 0, NULL);
if (!bp) {
if (!bp || bp->b_error) {
xfs_warn(mp, "realtime device size check failed");
if (bp)
xfs_buf_relse(bp);
return EIO;
}
xfs_buf_relse(bp);