1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index c172371481c7..2934ee0a39c6 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -269,6 +269,8 @@ struct r6_state {
 #define READ_MODIFY_WRITE       2
 /* not a write method, but a compute_parity mode */
 #define CHECK_PARITY            3
+/* Additional compute_parity mode -- updates the parity w/o LOCKING */
+#define UPDATE_PARITY           4
 
 /*
  * Stripe state