ceph: do not hide .snap in root directory

Snaps in the root directory are now supported by the MDS, and harmless on
older versions.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/dir.c

@@ -493,7 +493,6 @@ struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 
 	/* .snap dir? */
 	if (err == -ENOENT &&
-	    ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */
 	    strcmp(dentry->d_name.name,
 		   fsc->mount_options->snapdir_name) == 0) {
 		struct inode *inode = ceph_get_snapdir(parent);