xfs: fix di_metatype field of inodes that won't load

Make sure that the di_metatype field is at least set plausibly so that
later scrubbers could set the real type.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: Darrick J. Wong

fs/xfs/scrub/inode.c

@@ -443,8 +443,13 @@ xchk_dinode(
 		break;
 	case 2:
 	case 3:
-		if (!xfs_dinode_is_metadir(dip) && dip->di_metatype)
-			xchk_ino_set_corrupt(sc, ino);
+		if (xfs_dinode_is_metadir(dip)) {
+			if (be16_to_cpu(dip->di_metatype) >= XFS_METAFILE_MAX)
+				xchk_ino_set_corrupt(sc, ino);
+		} else {
+			if (dip->di_metatype != 0)
+				xchk_ino_set_corrupt(sc, ino);
+		}
 
 		if (dip->di_mode == 0 && sc->ip)
 			xchk_ino_set_corrupt(sc, ino);

fs/xfs/scrub/inode_repair.c

@@ -526,8 +526,12 @@ xrep_dinode_nlinks(
 		return;
 	}
 
-	if (!xfs_dinode_is_metadir(dip))
+	if (xfs_dinode_is_metadir(dip)) {
+		if (be16_to_cpu(dip->di_metatype) >= XFS_METAFILE_MAX)
+			dip->di_metatype = cpu_to_be16(XFS_METAFILE_UNKNOWN);
+	} else {
 		dip->di_metatype = 0;
+	}
 }
 
 /* Fix any conflicting flags that the verifiers complain about. */