block: pass a gendisk to the queue_sysfs_entry methods

The kobject for the queue entries is embedded into a struct gendisk.
Pass it to the sysfs methods instead of the request_queue derived from
it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240627111407.476276-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/elevator.c

@@ -709,24 +709,25 @@ static int elevator_change(struct request_queue *q, const char *elevator_name)
 	return ret;
 }
 
-ssize_t elv_iosched_store(struct request_queue *q, const char *buf,
+ssize_t elv_iosched_store(struct gendisk *disk, const char *buf,
 			  size_t count)
 {
 	char elevator_name[ELV_NAME_MAX];
 	int ret;
 
-	if (!elv_support_iosched(q))
+	if (!elv_support_iosched(disk->queue))
 		return count;
 
 	strscpy(elevator_name, buf, sizeof(elevator_name));
-	ret = elevator_change(q, strstrip(elevator_name));
+	ret = elevator_change(disk->queue, strstrip(elevator_name));
 	if (!ret)
 		return count;
 	return ret;
 }
 
-ssize_t elv_iosched_show(struct request_queue *q, char *name)
+ssize_t elv_iosched_show(struct gendisk *disk, char *name)
 {
+	struct request_queue *q = disk->queue;
 	struct elevator_queue *eq = q->elevator;
 	struct elevator_type *cur = NULL, *e;
 	int len = 0;

block/elevator.h

@@ -147,8 +147,8 @@ extern void elv_unregister(struct elevator_type *);
 /*
  * io scheduler sysfs switching
  */
-extern ssize_t elv_iosched_show(struct request_queue *, char *);
-extern ssize_t elv_iosched_store(struct request_queue *, const char *, size_t);
+ssize_t elv_iosched_show(struct gendisk *disk, char *page);
+ssize_t elv_iosched_store(struct gendisk *disk, const char *page, size_t count);
 
 extern bool elv_bio_merge_ok(struct request *, struct bio *);
 extern struct elevator_queue *elevator_alloc(struct request_queue *,