blk-throttle: pass a gendisk to blk_throtl_init and blk_throtl_exit

Pass the gendisk to blk_throtl_init and blk_throtl_exit as part of moving
the blk-cgroup infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-13-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-cgroup.c

@@ -1261,7 +1261,7 @@ int blkcg_init_disk(struct gendisk *disk)
 	if (ret)
 		goto err_destroy_all;
 
-	ret = blk_throtl_init(q);
+	ret = blk_throtl_init(disk);
 	if (ret)
 		goto err_ioprio_exit;
 
@@ -1272,7 +1272,7 @@ int blkcg_init_disk(struct gendisk *disk)
 	return 0;
 
 err_throtl_exit:
-	blk_throtl_exit(q);
+	blk_throtl_exit(disk);
 err_ioprio_exit:
 	blk_ioprio_exit(disk);
 err_destroy_all:
@@ -1288,7 +1288,7 @@ int blkcg_init_disk(struct gendisk *disk)
 void blkcg_exit_disk(struct gendisk *disk)
 {
 	blkg_destroy_all(disk->queue);
-	blk_throtl_exit(disk->queue);
+	blk_throtl_exit(disk);
 }
 
 static void blkcg_bind(struct cgroup_subsys_state *root_css)

block/blk-throttle.c

@@ -2351,8 +2351,9 @@ void blk_throtl_bio_endio(struct bio *bio)
 }
 #endif
 
-int blk_throtl_init(struct request_queue *q)
+int blk_throtl_init(struct gendisk *disk)
 {
+	struct request_queue *q = disk->queue;
 	struct throtl_data *td;
 	int ret;
 
@@ -2394,8 +2395,10 @@ int blk_throtl_init(struct request_queue *q)
 	return ret;
 }
 
-void blk_throtl_exit(struct request_queue *q)
+void blk_throtl_exit(struct gendisk *disk)
 {
+	struct request_queue *q = disk->queue;
+
 	BUG_ON(!q->td);
 	del_timer_sync(&q->td->service_queue.pending_timer);
 	throtl_shutdown_wq(q);

block/blk-throttle.h

@@ -168,14 +168,14 @@ static inline struct throtl_grp *blkg_to_tg(struct blkcg_gq *blkg)
  * Internal throttling interface
  */
 #ifndef CONFIG_BLK_DEV_THROTTLING
-static inline int blk_throtl_init(struct request_queue *q) { return 0; }
-static inline void blk_throtl_exit(struct request_queue *q) { }
+static inline int blk_throtl_init(struct gendisk *disk) { return 0; }
+static inline void blk_throtl_exit(struct gendisk *disk) { }
 static inline void blk_throtl_register_queue(struct request_queue *q) { }
 static inline bool blk_throtl_bio(struct bio *bio) { return false; }
 static inline void blk_throtl_cancel_bios(struct request_queue *q) { }
 #else /* CONFIG_BLK_DEV_THROTTLING */
-int blk_throtl_init(struct request_queue *q);
-void blk_throtl_exit(struct request_queue *q);
+int blk_throtl_init(struct gendisk *disk);
+void blk_throtl_exit(struct gendisk *disk);
 void blk_throtl_register_queue(struct request_queue *q);
 bool __blk_throtl_bio(struct bio *bio);
 void blk_throtl_cancel_bios(struct request_queue *q);