dm: use generic functions instead of disable_discard and disable_write_zeroes

A small code cleanup: use blk_queue_disable_discard and
blk_queue_disable_write_zeroes instead of disable_discard and
disable_write_zeroes.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: Mikulas Patocka

drivers/md/dm-core.h

@@ -163,9 +163,6 @@ struct mapped_device {
 #define DMF_POST_SUSPENDING 8
 #define DMF_EMULATE_ZONE_APPEND 9
 
-void disable_discard(struct mapped_device *md);
-void disable_write_zeroes(struct mapped_device *md);
-
 static inline sector_t dm_get_size(struct mapped_device *md)
 {
 	return get_capacity(md->disk);

drivers/md/dm-rq.c

@@ -217,10 +217,10 @@ static void dm_done(struct request *clone, blk_status_t error, bool mapped)
 	if (unlikely(error == BLK_STS_TARGET)) {
 		if (req_op(clone) == REQ_OP_DISCARD &&
 		    !clone->q->limits.max_discard_sectors)
-			disable_discard(tio->md);
+			blk_queue_disable_discard(tio->md->queue);
 		else if (req_op(clone) == REQ_OP_WRITE_ZEROES &&
 			 !clone->q->limits.max_write_zeroes_sectors)
-			disable_write_zeroes(tio->md);
+			blk_queue_disable_write_zeroes(tio->md->queue);
 	}
 
 	switch (r) {

drivers/md/dm.c

@@ -1082,22 +1082,6 @@ static inline struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
 	return &md->queue->limits;
 }
 
-void disable_discard(struct mapped_device *md)
-{
-	struct queue_limits *limits = dm_get_queue_limits(md);
-
-	/* device doesn't really support DISCARD, disable it */
-	limits->max_hw_discard_sectors = 0;
-}
-
-void disable_write_zeroes(struct mapped_device *md)
-{
-	struct queue_limits *limits = dm_get_queue_limits(md);
-
-	/* device doesn't really support WRITE ZEROES, disable it */
-	limits->max_write_zeroes_sectors = 0;
-}
-
 static bool swap_bios_limit(struct dm_target *ti, struct bio *bio)
 {
 	return unlikely((bio->bi_opf & REQ_SWAP) != 0) && unlikely(ti->limit_swap_bios);
@@ -1115,10 +1099,10 @@ static void clone_endio(struct bio *bio)
 	if (unlikely(error == BLK_STS_TARGET)) {
 		if (bio_op(bio) == REQ_OP_DISCARD &&
 		    !bdev_max_discard_sectors(bio->bi_bdev))
-			disable_discard(md);
+			blk_queue_disable_discard(md->queue);
 		else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
 			 !bdev_write_zeroes_sectors(bio->bi_bdev))
-			disable_write_zeroes(md);
+			blk_queue_disable_write_zeroes(md->queue);
 	}
 
 	if (static_branch_unlikely(&zoned_enabled) &&