md: support REQ_OP_WRITE_ZEROES

Copy & paste from the REQ_OP_WRITE_SAME code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

7 files changed, 16 insertions, 1 deletions

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 3e38e0207a3e..377a8a3672e3 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -293,6 +293,7 @@ static void linear_make_request(struct mddev *mddev, struct bio *bio)
                                                       split, disk_devt(mddev->gendisk),
                                                       bio_sector);
                         mddev_check_writesame(mddev, split);
+                        mddev_check_write_zeroes(mddev, split);
                         generic_make_request(split);
                 }
         } while (split != bio);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index dde8ecb760c8..1e76d64ce180 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -709,4 +709,11 @@ static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio)
             !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors)
                 mddev->queue->limits.max_write_same_sectors = 0;
 }
+
+static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio)
+{
+        if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
+            !bdev_get_queue(bio->bi_bdev)->limits.max_write_zeroes_sectors)
+                mddev->queue->limits.max_write_zeroes_sectors = 0;
+}
 #endif /* _MD_MD_H */
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 79a12b59250b..e95d521d93e9 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -139,6 +139,7 @@ static void multipath_make_request(struct mddev *mddev, struct bio * bio)
         mp_bh->bio.bi_end_io = multipath_end_request;
         mp_bh->bio.bi_private = mp_bh;
         mddev_check_writesame(mddev, &mp_bh->bio);
+        mddev_check_write_zeroes(mddev, &mp_bh->bio);
         generic_make_request(&mp_bh->bio);
         return;
 }
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 93347ca7c7a6..ce7a6a56cf73 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -383,6 +383,7 @@ static int raid0_run(struct mddev *mddev)
 
                 blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
                 blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
+                blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors);
                 blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
 
                 blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
@@ -504,6 +505,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
                                                       split, disk_devt(mddev->gendisk),
                                                       bio_sector);
                         mddev_check_writesame(mddev, split);
+                        mddev_check_write_zeroes(mddev, split);
                         generic_make_request(split);
                 }
         } while (split != bio);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a34f58772022..b59cc100320a 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3177,8 +3177,10 @@ static int raid1_run(struct mddev *mddev)
         if (IS_ERR(conf))
                 return PTR_ERR(conf);
 
-        if (mddev->queue)
+        if (mddev->queue) {
                 blk_queue_max_write_same_sectors(mddev->queue, 0);
+                blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
+        }
 
         rdev_for_each(rdev, mddev) {
                 if (!mddev->gendisk)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e89a8d78a9ed..28ec3a93acee 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3749,6 +3749,7 @@ static int raid10_run(struct mddev *mddev)
                 blk_queue_max_discard_sectors(mddev->queue,
                                               mddev->chunk_sectors);
                 blk_queue_max_write_same_sectors(mddev->queue, 0);
+                blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
                 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);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7aeb9691c2e1..1725a54042bb 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7270,6 +7270,7 @@ static int raid5_run(struct mddev *mddev)
                 mddev->queue->limits.discard_zeroes_data = 0;
 
                 blk_queue_max_write_same_sectors(mddev->queue, 0);
+                blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
 
                 rdev_for_each(rdev, mddev) {
                         disk_stack_limits(mddev->gendisk, rdev->bdev,