scsi: md: Remove WRITE_SAME support

There are no more end-users of REQ_OP_WRITE_SAME left, so we can start
deleting it.

Link: https://lore.kernel.org/r/20220209082828.2629273-6-hch@lst.deSigned-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/md/md-linear.c

@@ -259,7 +259,6 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
 		if (mddev->gendisk)
 			trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
 					      bio_sector);
-		mddev_check_writesame(mddev, bio);
 		mddev_check_write_zeroes(mddev, bio);
 		submit_bio_noacct(bio);
 	}

drivers/md/md-multipath.c

@@ -129,7 +129,6 @@ static bool multipath_make_request(struct mddev *mddev, struct bio * bio)
 	mp_bh->bio.bi_opf |= REQ_FAILFAST_TRANSPORT;
 	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);
 	submit_bio_noacct(&mp_bh->bio);
 	return true;

drivers/md/md.h

@@ -797,13 +797,6 @@ static inline void mddev_clear_unsupported_flags(struct mddev *mddev,
 	mddev->flags &= ~unsupported_flags;
 }
 
-static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio)
-{
-	if (bio_op(bio) == REQ_OP_WRITE_SAME &&
-	    !bio->bi_bdev->bd_disk->queue->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 &&

drivers/md/raid0.c

@@ -402,7 +402,6 @@ static int raid0_run(struct mddev *mddev)
 		bool discard_supported = false;
 
 		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, UINT_MAX);
 
@@ -594,7 +593,6 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
 	if (mddev->gendisk)
 		trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
 				      bio_sector);
-	mddev_check_writesame(mddev, bio);
 	mddev_check_write_zeroes(mddev, bio);
 	submit_bio_noacct(bio);
 	return true;

drivers/md/raid1.c

@@ -3147,10 +3147,8 @@ static int raid1_run(struct mddev *mddev)
 	if (IS_ERR(conf))
 		return PTR_ERR(conf);
 
-	if (mddev->queue) {
-		blk_queue_max_write_same_sectors(mddev->queue, 0);
+	if (mddev->queue)
 		blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
-	}
 
 	rdev_for_each(rdev, mddev) {
 		if (!mddev->gendisk)

drivers/md/raid10.c

@@ -4115,7 +4115,6 @@ static int raid10_run(struct mddev *mddev)
 	if (mddev->queue) {
 		blk_queue_max_discard_sectors(mddev->queue,
 					      UINT_MAX);
-		blk_queue_max_write_same_sectors(mddev->queue, 0);
 		blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
 		blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
 		raid10_set_io_opt(conf);

drivers/md/raid5.c

@@ -7767,7 +7767,6 @@ static int raid5_run(struct mddev *mddev)
 		mddev->queue->limits.discard_alignment = stripe;
 		mddev->queue->limits.discard_granularity = stripe;
 
-		blk_queue_max_write_same_sectors(mddev->queue, 0);
 		blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
 
 		rdev_for_each(rdev, mddev) {