diff --git a/fs/ceph/ceph_fs.h b/fs/ceph/ceph_fs.h
index 4e5f49c..699196a 100644
--- a/fs/ceph/ceph_fs.h
+++ b/fs/ceph/ceph_fs.h
@@ -44,6 +44,7 @@
 
 
 #define CEPH_INO_ROOT  1
+#define CEPH_INO_CEPH  2        /* hidden .ceph dir */
 
 /* arbitrary limit on max # of monitors (cluster of 3 is typical) */
 #define CEPH_MAX_MON   31