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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
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@@ -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;
}