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-rw-r--r--drivers/md/md.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1cd9bfb45e9a..9a880239219d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1738,6 +1738,11 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);
+ if (test_bit(WriteMostly, &rdev->flags))
+ sb->devflags |= WriteMostly1;
+ else
+ sb->devflags &= ~WriteMostly1;
+
if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);