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xfs: always check the existence of a dirent's child inode

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When we're scrubbing directory entries, we always need to iget the child
inode to make sure that the inode pointer points to a valid inode.  The
original directory scrub code (commit a5c4) only set us up to do this
for ftype=1 filesystems, which is not sufficient; and then commit 4b80
made it worse by exempting the dot and dotdot entries.

Sorta-fixes: a5c46e5e89 ("xfs: scrub directory metadata")
Sorta-fixes: 4b80ac6445 ("xfs: scrub should mark a directory corrupt if any entries cannot be iget'd")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:18 -07:00
parent d9a94480f9
commit 6bb9209cee
1 changed files with 28 additions and 45 deletions
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73
fs/xfs/scrub/dir.c
View File

@ -33,52 +33,23 @@ xchk_setup_directory(
/* Scrub a directory entry. */
/* Check that an inode's mode matches a given XFS_DIR3_FT_* type. */
STATIC int
STATIC void
xchk_dir_check_ftype(
struct xfs_scrub *sc,
xfs_fileoff_t offset,
xfs_ino_t inum,
struct xfs_inode *ip,
int ftype)
{
struct xfs_mount *mp = sc->mp;
struct xfs_inode *ip;
int error = 0;
if (!xfs_has_ftype(mp)) {
if (ftype != XFS_DIR3_FT_UNKNOWN && ftype != XFS_DIR3_FT_DIR)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
goto out;
return;
}
/*
* Grab the inode pointed to by the dirent. We release the
* inode before we cancel the scrub transaction. Since we're
* don't know a priori that releasing the inode won't trigger
* eofblocks cleanup (which allocates what would be a nested
* transaction), we can't use DONTCACHE here because DONTCACHE
* inodes can trigger immediate inactive cleanup of the inode.
* Use UNTRUSTED here to check the allocation status of the inode in
* the inode btrees.
*
* If _iget returns -EINVAL or -ENOENT then the child inode number is
* garbage and the directory is corrupt. If the _iget returns
* -EFSCORRUPTED or -EFSBADCRC then the child is corrupt which is a
* cross referencing error. Any other error is an operational error.
*/
error = xfs_iget(mp, sc->tp, inum, XFS_IGET_UNTRUSTED, 0, &ip);
if (error == -EINVAL || error == -ENOENT) {
error = -EFSCORRUPTED;
xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error);
goto out;
}
if (!xchk_fblock_xref_process_error(sc, XFS_DATA_FORK, offset, &error))
goto out;
if (xfs_mode_to_ftype(VFS_I(ip)->i_mode) != ftype)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
xfs_irele(ip);
out:
return error;
}
/*
@ -97,9 +68,9 @@ xchk_dir_actor(
void *priv)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_inode *ip;
xfs_ino_t lookup_ino;
xfs_dablk_t offset;
bool checked_ftype = false;
int error = 0;
offset = xfs_dir2_db_to_da(mp->m_dir_geo,
@ -122,9 +93,6 @@ xchk_dir_actor(
if (!strncmp(".", name->name, name->len)) {
/* If this is "." then check that the inum matches the dir. */
if (xfs_has_ftype(mp) && name->type != XFS_DIR3_FT_DIR)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
checked_ftype = true;
if (ino != dp->i_ino)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
} else if (!strncmp("..", name->name, name->len)) {
@ -132,9 +100,6 @@ xchk_dir_actor(
* If this is ".." in the root inode, check that the inum
* matches this dir.
*/
if (xfs_has_ftype(mp) && name->type != XFS_DIR3_FT_DIR)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
checked_ftype = true;
if (dp->i_ino == mp->m_sb.sb_rootino && ino != dp->i_ino)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
}
@ -151,14 +116,32 @@ xchk_dir_actor(
return -ECANCELED;
}
/* Verify the file type. This function absorbs error codes. */
if (!checked_ftype) {
error = xchk_dir_check_ftype(sc, offset, lookup_ino,
name->type);
if (error)
goto out;
/*
* Grab the inode pointed to by the dirent. We release the
* inode before we cancel the scrub transaction. Since we're
* don't know a priori that releasing the inode won't trigger
* eofblocks cleanup (which allocates what would be a nested
* transaction), we can't use DONTCACHE here because DONTCACHE
* inodes can trigger immediate inactive cleanup of the inode.
* Use UNTRUSTED here to check the allocation status of the inode in
* the inode btrees.
*
* If _iget returns -EINVAL or -ENOENT then the child inode number is
* garbage and the directory is corrupt. If the _iget returns
* -EFSCORRUPTED or -EFSBADCRC then the child is corrupt which is a
* cross referencing error. Any other error is an operational error.
*/
error = xfs_iget(mp, sc->tp, ino, XFS_IGET_UNTRUSTED, 0, &ip);
if (error == -EINVAL || error == -ENOENT) {
error = -EFSCORRUPTED;
xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error);
goto out;
}
if (!xchk_fblock_xref_process_error(sc, XFS_DATA_FORK, offset, &error))
goto out;
xchk_dir_check_ftype(sc, offset, ip, name->type);
xfs_irele(ip);
out:
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return -ECANCELED;