From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
In xchk_dir_check_ftype, we should mark the directory corrupt if we try
to _iget a directory entry's inode pointer and the inode btree says the
inode is not allocated. This involves changing the IGET call to force
the inobt lookup to return EINVAL if the inode isn't allocated; and
rearranging the code so that we always perform the iget.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/dir.c | 43 ++++++++++++++++++++++++++-----------------
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index 54afa75c95d1..a775fbf49a0d 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -39,9 +39,12 @@ struct xchk_dir_ctx {
struct xfs_scrub *sc;
};
-/* Check that an inode's mode matches a given DT_ type. */
+/*
+ * Check that a directory entry's inode pointer directs us to an allocated
+ * inode and (if applicable) the inode mode matches the entry's DT_ type.
+ */
STATIC int
-xchk_dir_check_ftype(
+xchk_dir_check_iptr(
struct xchk_dir_ctx *sdc,
xfs_fileoff_t offset,
xfs_ino_t inum,
@@ -52,13 +55,6 @@ xchk_dir_check_ftype(
int ino_dtype;
int error = 0;
- if (!xfs_sb_version_hasftype(&mp->m_sb)) {
- if (dtype != DT_UNKNOWN && dtype != DT_DIR)
- xchk_fblock_set_corrupt(sdc->sc, XFS_DATA_FORK,
- offset);
- goto out;
- }
-
/*
* Grab the inode pointed to by the dirent. We release the
* inode before we cancel the scrub transaction. Since we're
@@ -66,17 +62,30 @@ xchk_dir_check_ftype(
* 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.
+ *
+ * We use UNTRUSTED here so that iget will return EINVAL if we have an
+ * inode pointer that points to an unallocated inode.
*/
- error = xfs_iget(mp, sdc->sc->tp, inum, 0, 0, &ip);
+ error = xfs_iget(mp, sdc->sc->tp, inum, XFS_IGET_UNTRUSTED, 0, &ip);
+ if (error == -EINVAL) {
+ xchk_fblock_set_corrupt(sdc->sc, XFS_DATA_FORK, offset);
+ return -EFSCORRUPTED;
+ }
if (!xchk_fblock_xref_process_error(sdc->sc, XFS_DATA_FORK, offset,
&error))
goto out;
- /* Convert mode to the DT_* values that dir_emit uses. */
- ino_dtype = xfs_dir3_get_dtype(mp,
- xfs_mode_to_ftype(VFS_I(ip)->i_mode));
- if (ino_dtype != dtype)
- xchk_fblock_set_corrupt(sdc->sc, XFS_DATA_FORK, offset);
+ if (xfs_sb_version_hasftype(&mp->m_sb)) {
+ /* Convert mode to the DT_* values that dir_emit uses. */
+ ino_dtype = xfs_dir3_get_dtype(mp,
+ xfs_mode_to_ftype(VFS_I(ip)->i_mode));
+ if (ino_dtype != dtype)
+ xchk_fblock_set_corrupt(sdc->sc, XFS_DATA_FORK, offset);
+ } else {
+ if (dtype != DT_UNKNOWN && dtype != DT_DIR)
+ xchk_fblock_set_corrupt(sdc->sc, XFS_DATA_FORK,
+ offset);
+ }
xfs_irele(ip);
out:
return error;
@@ -168,8 +177,8 @@ xchk_dir_actor(
goto out;
}
- /* Verify the file type. This function absorbs error codes. */
- error = xchk_dir_check_ftype(sdc, offset, lookup_ino, type);
+ /* Verify the inode pointer. This function absorbs error codes. */
+ error = xchk_dir_check_iptr(sdc, offset, lookup_ino, type);
if (error)
goto out;
out:
