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authorDave Chinner <dchinner@redhat.com>2014-10-02 09:05:32 +1000
committerDave Chinner <david@fromorbit.com>2014-10-02 09:05:32 +1000
commitba3726742c1712c43c5a18245476f3fe9fe74773 (patch)
tree6d0d0b63f3785fff34b194a9bf4da785e9abeba6 /fs/xfs/xfs_mount.c
parent595bff75dce51e0d6d94877b4b6d11b4747a63fd (diff)
downloadlinux-ba3726742c1712c43c5a18245476f3fe9fe74773.tar.bz2
xfs: check xfs_buf_read_uncached returns correctly
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>
Diffstat (limited to 'fs/xfs/xfs_mount.c')
-rw-r--r--fs/xfs/xfs_mount.c55
1 files changed, 26 insertions, 29 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index fbf0384a466f..142c460fc64e 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -302,21 +302,15 @@ xfs_readsb(
* access to the superblock.
*/
reread:
- bp = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), 0, buf_ops);
- if (!bp) {
- if (loud)
- xfs_warn(mp, "SB buffer read failed");
- return -EIO;
- }
- if (bp->b_error) {
- error = bp->b_error;
+ error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
+ BTOBB(sector_size), 0, &bp, buf_ops);
+ if (error) {
if (loud)
xfs_warn(mp, "SB validate failed with error %d.", error);
/* bad CRC means corrupted metadata */
if (error == -EFSBADCRC)
error = -EFSCORRUPTED;
- goto release_buf;
+ return error;
}
/*
@@ -546,40 +540,43 @@ xfs_set_inoalignment(xfs_mount_t *mp)
* Check that the data (and log if separate) is an ok size.
*/
STATIC int
-xfs_check_sizes(xfs_mount_t *mp)
+xfs_check_sizes(
+ struct xfs_mount *mp)
{
- xfs_buf_t *bp;
+ struct xfs_buf *bp;
xfs_daddr_t d;
+ int error;
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
xfs_warn(mp, "filesystem size mismatch detected");
return -EFBIG;
}
- bp = xfs_buf_read_uncached(mp->m_ddev_targp,
+ error = xfs_buf_read_uncached(mp->m_ddev_targp,
d - XFS_FSS_TO_BB(mp, 1),
- XFS_FSS_TO_BB(mp, 1), 0, NULL);
- if (!bp) {
+ XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
+ if (error) {
xfs_warn(mp, "last sector read failed");
- return -EIO;
+ return error;
}
xfs_buf_relse(bp);
- if (mp->m_logdev_targp != mp->m_ddev_targp) {
- d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
- if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
- xfs_warn(mp, "log size mismatch detected");
- return -EFBIG;
- }
- bp = xfs_buf_read_uncached(mp->m_logdev_targp,
+ if (mp->m_logdev_targp == mp->m_ddev_targp)
+ return 0;
+
+ d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
+ if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
+ xfs_warn(mp, "log size mismatch detected");
+ return -EFBIG;
+ }
+ error = xfs_buf_read_uncached(mp->m_logdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
- XFS_FSB_TO_BB(mp, 1), 0, NULL);
- if (!bp) {
- xfs_warn(mp, "log device read failed");
- return -EIO;
- }
- xfs_buf_relse(bp);
+ XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
+ if (error) {
+ xfs_warn(mp, "log device read failed");
+ return error;
}
+ xfs_buf_relse(bp);
return 0;
}