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xfs: validate the realtime geometry in xfs_validate_sb_common 

Validate the geometry of the realtime geometry when we mount the
filesystem, so that we don't abruptly shut down the filesystem later on.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-03-24 23:03:24 -07:00
parent 27fb5a72f5
commit f8e566c0f5
1 changed files with 32 additions and 0 deletions
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32
fs/xfs/libxfs/xfs_sb.c
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@ -328,6 +328,38 @@ xfs_validate_sb_common(
return -EFSCORRUPTED;
}
/* Validate the realtime geometry; stolen from xfs_repair */
if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||
sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) {
xfs_notice(mp,
"realtime extent sanity check failed");
return -EFSCORRUPTED;
}
if (sbp->sb_rblocks == 0) {
if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||
sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) {
xfs_notice(mp,
"realtime zeroed geometry check failed");
return -EFSCORRUPTED;
}
} else {
uint64_t rexts;
uint64_t rbmblocks;
rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize);
rbmblocks = howmany_64(sbp->sb_rextents,
NBBY * sbp->sb_blocksize);
if (sbp->sb_rextents != rexts ||
sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) ||
sbp->sb_rbmblocks != rbmblocks) {
xfs_notice(mp,
"realtime geometry sanity check failed");
return -EFSCORRUPTED;
}
}
if (sbp->sb_unit) {
if (!xfs_sb_version_hasdalign(sbp) ||
sbp->sb_unit > sbp->sb_width ||