raid1: copy write hint from master bio to behind bio

Signed-off-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6f624311cec2..e9e3308cb0a7 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1102,6 +1102,8 @@ static void alloc_behind_master_bio(struct r1bio *r1_bio,
                 goto skip_copy;
         }
 
+        behind_bio->bi_write_hint = bio->bi_write_hint;
+
         while (i < vcnt && size) {
                 struct page *page;
                 int len = min_t(int, PAGE_SIZE, size);