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xfs: detect misaligned rtinherit directory extent size hints

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If we encounter a directory that has been configured to pass on an
extent size hint to a new realtime file and the hint isn't an integer
multiple of the rt extent size, we should flag the hint for
administrative review because that is a misconfiguration (that other
parts of the kernel will fix automatically).

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2021-07-14 09:03:41 -07:00
parent 0925fecc55
commit b102a46ce1
1 changed files with 16 additions and 2 deletions
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18
fs/xfs/scrub/inode.c
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@ -73,11 +73,25 @@ xchk_inode_extsize(
uint16_t flags)
{
xfs_failaddr_t fa;
uint32_t value = be32_to_cpu(dip->di_extsize);
fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize),
mode, flags);
fa = xfs_inode_validate_extsize(sc->mp, value, mode, flags);
if (fa)
xchk_ino_set_corrupt(sc, ino);
/*
* XFS allows a sysadmin to change the rt extent size when adding a rt
* section to a filesystem after formatting. If there are any
* directories with extszinherit and rtinherit set, the hint could
* become misaligned with the new rextsize. The verifier doesn't check
* this, because we allow rtinherit directories even without an rt
* device. Flag this as an administrative warning since we will clean
* this up eventually.
*/
if ((flags & XFS_DIFLAG_RTINHERIT) &&
(flags & XFS_DIFLAG_EXTSZINHERIT) &&
value % sc->mp->m_sb.sb_rextsize > 0)
xchk_ino_set_warning(sc, ino);
}
/*