ceph: sync header defs with server code

Define ROLLBACK op, IFLOCK inode lock (for advisory file locking).

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/ceph_fs.h b/fs/ceph/ceph_fs.h
index 663ff90..bf7dea6 100644
--- a/fs/ceph/ceph_fs.h
+++ b/fs/ceph/ceph_fs.h
@@ -253,6 +253,7 @@
 #define CEPH_LOCK_IDFT        512   /* dir frag tree */
 #define CEPH_LOCK_INEST       1024  /* mds internal */
 #define CEPH_LOCK_IXATTR      2048
+#define CEPH_LOCK_IFLOCK      4096  /* advisory file locks */
 #define CEPH_LOCK_INO         8192  /* immutable inode bits; not a lock */
 
 /* client_session ops */