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xfs: check xfs_buf_read_uncached returns correctly

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xfs_buf_read_uncached() has two failure modes. If can either return
NULL or bp->b_error != 0 depending on the type of failure, and not
all callers check for both. Fix it so that xfs_buf_read_uncached()
always returns the error status, and the buffer is returned as a
function parameter. The buffer will only be returned on success.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner
2014-10-02 09:05:32 +10:00
committed by Dave Chinner
parent 595bff75dc
commit ba3726742c
5 changed files with 59 additions and 63 deletions
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18
fs/xfs/xfs_buf.c
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@@ -688,29 +688,39 @@ xfs_buf_readahead_map(
* Read an uncached buffer from disk. Allocates and returns a locked
* buffer containing the disk contents or nothing.
*/
struct xfs_buf *
int
xfs_buf_read_uncached(
struct xfs_buftarg *target,
xfs_daddr_t daddr,
size_t numblks,
int flags,
struct xfs_buf **bpp,
const struct xfs_buf_ops *ops)
{
struct xfs_buf *bp;
*bpp = NULL;
bp = xfs_buf_get_uncached(target, numblks, flags);
if (!bp)
return NULL;
return -ENOMEM;
/* set up the buffer for a read IO */
ASSERT(bp->b_map_count == 1);
bp->b_bn = daddr;
bp->b_bn = XFS_BUF_DADDR_NULL; /* always null for uncached buffers */
bp->b_maps[0].bm_bn = daddr;
bp->b_flags |= XBF_READ;
bp->b_ops = ops;
xfs_buf_submit_wait(bp);
return bp;
if (bp->b_error) {
int error = bp->b_error;
xfs_buf_relse(bp);
return error;
}
*bpp = bp;
return 0;
}
/*