[PATCH] dm: use generic functions instead of disable_discard and disable_write_zeroes

[Mikulas Patocka]

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 <mpato...@redhat.com>

---
 drivers/md/dm-core.h |    3 ---
 drivers/md/dm-rq.c   |    4 ++--
 drivers/md/dm.c      |   20 ++------------------
 3 files changed, 4 insertions(+), 23 deletions(-)

Index: linux-2.6/drivers/md/dm.c
===================================================================
--- linux-2.6.orig/drivers/md/dm.c      2025-04-14 21:19:19.000000000 +0200
+++ linux-2.6/drivers/md/dm.c   2025-04-14 21:19:19.000000000 +0200
@@ -1082,22 +1082,6 @@ static inline struct queue_limits *dm_ge
        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) &&
Index: linux-2.6/drivers/md/dm-rq.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-rq.c   2025-04-14 21:19:19.000000000 +0200
+++ linux-2.6/drivers/md/dm-rq.c        2025-04-14 21:19:19.000000000 +0200
@@ -217,10 +217,10 @@ static void dm_done(struct request *clon
        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) {
Index: linux-2.6/drivers/md/dm-core.h
===================================================================
--- linux-2.6.orig/drivers/md/dm-core.h 2025-04-14 21:19:01.000000000 +0200
+++ linux-2.6/drivers/md/dm-core.h      2025-04-14 21:19:41.000000000 +0200
@@ -162,9 +162,6 @@ 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);