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xfs: flag inode corruption if parent ptr doesn't get us a real inode

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If a directory's parent inode pointer doesn't point to an inode, the
directory should be flagged as corrupt.  Enable IGET_UNTRUSTED here so
that _iget will return -EINVAL if the inobt does not confirm that the
inode is present and allocated and we can flag the directory corruption.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-03-23 10:06:56 -07:00
parent 6a96c56505
commit 5927268f5a
1 changed files with 11 additions and 1 deletions
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12
fs/xfs/scrub/parent.c
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@ -167,8 +167,18 @@ xfs_scrub_parent_validate(
* if the parent pointer erroneously points to a file, we
* can't use DONTCACHE here because DONTCACHE inodes can trigger
* immediate inactive cleanup of the inode.
*
* If _iget returns -EINVAL then the parent inode number is garbage
* and the directory is corrupt. If the _iget returns -EFSCORRUPTED
* or -EFSBADCRC then the parent is corrupt which is a cross
* referencing error. Any other error is an operational error.
*/
error = xfs_iget(mp, sc->tp, dnum, 0, 0, &dp);
error = xfs_iget(mp, sc->tp, dnum, XFS_IGET_UNTRUSTED, 0, &dp);
if (error == -EINVAL) {
error = -EFSCORRUPTED;
xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error);
goto out;
}
if (!xfs_scrub_fblock_xref_process_error(sc, XFS_DATA_FORK, 0, &error))
goto out;
if (dp == sc->ip || !S_ISDIR(VFS_I(dp)->i_mode)) {