diff --git a/drivers/md/md.h b/drivers/md/md.h
index bfebcfd..6dc0ce0 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -171,6 +171,10 @@
 				 * a want_replacement device with same
 				 * raid_disk number.
 				 */
+	Candidate,		/* For clustered environments only:
+				 * This device is seen locally but not
+				 * by the whole cluster
+				 */
 };
 
 #define BB_LEN_MASK	(0x00000000000001FFULL)
@@ -666,6 +670,7 @@
 
 extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);
 extern void md_reload_sb(struct mddev *mddev);
+extern void md_update_sb(struct mddev *mddev, int force);
 static inline int mddev_check_plugged(struct mddev *mddev)
 {
 	return !!blk_check_plugged(md_unplug, mddev,