1 files changed, 1 insertions, 0 deletions
diff --git a/mdadm.h b/mdadm.h
index c841f33e..2a7d038d 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -414,6 +414,7 @@ struct mdinfo {
 	#define DS_BLOCKED	16
 	#define	DS_REMOVE	1024
 	#define	DS_UNBLOCK	2048
+	#define	DS_EXTERNAL_BB	4096
 	int prev_state, curr_state, next_state;
 
 	/* info read from sysfs */