1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/md/md.h b/drivers/md/md.h
index e38936d05df1..2a514036a83d 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -212,6 +212,7 @@ extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
                                 int is_new);
 struct md_cluster_info;
 
+/* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */
 enum mddev_flags {
         MD_ARRAY_FIRST_USE,     /* First use of array, needs initialization */
         MD_CLOSING,             /* If set, we are closing the array, do not open
@@ -702,4 +703,11 @@ static inline int mddev_is_clustered(struct mddev *mddev)
 {
         return mddev->cluster_info && mddev->bitmap_info.nodes > 1;
 }
+
+/* clear unsupported mddev_flags */
+static inline void mddev_clear_unsupported_flags(struct mddev *mddev,
+        unsigned long unsupported_flags)
+{
+        mddev->flags &= ~unsupported_flags;
+}
 #endif /* _MD_MD_H */