[PATCH] ext3: force ro mount if ext3_setup_super() fails

[Eric Sandeen <sandeen@redhat.com>]

If ext3_setup_super() fails i.e. due to a too-high revision,
the error is logged in dmesg but the fs is not mounted RO as
indicated.

Tested by:

# mkfs.ext3 -r 4 /dev/sdb6
# mount /dev/sdb6 /mnt/test
# dmesg | grep "too high"
[164152.114551] EXT3-fs (sdb6): error: revision level too high, forcing read-only mode
# grep sdb6 /proc/mounts
/dev/sdb6 /mnt/test2 ext3 rw,seclabel,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered 0 0
                          ^^

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index cf0b592..fef7af2 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2043,7 +2043,8 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 		goto failed_mount3;
 	}
 
-	ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
+	if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
+		sb->s_flags |= MS_RDONLY;
 
 	EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
 	ext3_orphan_cleanup(sb, es);