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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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30
fs/xfs/xfs_rtalloc.c
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@@ -972,16 +972,11 @@ xfs_growfs_rt(
/*
* Read in the last block of the device, make sure it exists.
*/
bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
error = xfs_buf_read_uncached(mp->m_rtdev_targp,
XFS_FSB_TO_BB(mp, nrblocks - 1),
XFS_FSB_TO_BB(mp, 1), 0, NULL);
if (!bp)
return -EIO;
if (bp->b_error) {
error = bp->b_error;
xfs_buf_relse(bp);
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
if (error)
return error;
}
xfs_buf_relse(bp);
/*
@@ -1235,11 +1230,12 @@ xfs_rtallocate_extent(
*/
int /* error */
xfs_rtmount_init(
xfs_mount_t *mp) /* file system mount structure */
struct xfs_mount *mp) /* file system mount structure */
{
xfs_buf_t *bp; /* buffer for last block of subvolume */
xfs_daddr_t d; /* address of last block of subvolume */
xfs_sb_t *sbp; /* filesystem superblock copy in mount */
struct xfs_buf *bp; /* buffer for last block of subvolume */
struct xfs_sb *sbp; /* filesystem superblock copy in mount */
xfs_daddr_t d; /* address of last block of subvolume */
int error;
sbp = &mp->m_sb;
if (sbp->sb_rblocks == 0)
@@ -1265,14 +1261,12 @@ xfs_rtmount_init(
(unsigned long long) mp->m_sb.sb_rblocks);
return -EFBIG;
}
bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
error = 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 || bp->b_error) {
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
if (error) {
xfs_warn(mp, "realtime device size check failed");
if (bp)
xfs_buf_relse(bp);
return -EIO;
return error;
}
xfs_buf_relse(bp);
return 0;