1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 64d48249c03b..1a74c12f0a6e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1105,6 +1105,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
         const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
         const unsigned long do_discard = (bio->bi_rw
                                           & (REQ_DISCARD | REQ_SECURE));
+        const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME);
         unsigned long flags;
         struct md_rdev *blocked_rdev;
         struct blk_plug_cb *cb;
@@ -1460,7 +1461,8 @@ retry_write:
                                                               rdev));
                         mbio->bi_bdev = rdev->bdev;
                         mbio->bi_end_io = raid10_end_write_request;
-                        mbio->bi_rw = WRITE | do_sync | do_fua | do_discard;
+                        mbio->bi_rw =
+                                WRITE | do_sync | do_fua | do_discard | do_same;
                         mbio->bi_private = r10_bio;
 
                         atomic_inc(&r10_bio->remaining);
@@ -1502,7 +1504,8 @@ retry_write:
                                                    r10_bio, rdev));
                         mbio->bi_bdev = rdev->bdev;
                         mbio->bi_end_io = raid10_end_write_request;
-                        mbio->bi_rw = WRITE | do_sync | do_fua | do_discard;
+                        mbio->bi_rw =
+                                WRITE | do_sync | do_fua | do_discard | do_same;
                         mbio->bi_private = r10_bio;
 
                         atomic_inc(&r10_bio->remaining);
@@ -3569,6 +3572,8 @@ static int run(struct mddev *mddev)
         if (mddev->queue) {
                 blk_queue_max_discard_sectors(mddev->queue,
                                               mddev->chunk_sectors);
+                blk_queue_max_write_same_sectors(mddev->queue,
+                                                 mddev->chunk_sectors);
                 blk_queue_io_min(mddev->queue, chunk_size);
                 if (conf->geo.raid_disks % conf->geo.near_copies)
                         blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);