block, bfq: don't declare 'bfqd' as type 'void *' in bfq_group

Prevent unnecessary format conversion for bfqg->bfqd in multiple
places.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Paolo Valente <paolo.valente@unimore.it>
Link: https://lore.kernel.org/r/20221102022542.3621219-6-yukuai1@huaweicloud.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bfq-cgroup.c

@@ -224,7 +224,7 @@ void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq,
 {
 	blkg_rwstat_add(&bfqg->stats.queued, opf, 1);
 	bfqg_stats_end_empty_time(&bfqg->stats);
-	if (!(bfqq == ((struct bfq_data *)bfqg->bfqd)->in_service_queue))
+	if (!(bfqq == bfqg->bfqd->in_service_queue))
 		bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq));
 }
 

block/bfq-iosched.h

@@ -931,7 +931,7 @@ struct bfq_group {
 	struct bfq_entity entity;
 	struct bfq_sched_data sched_data;
 
-	void *bfqd;
+	struct bfq_data *bfqd;
 
 	struct bfq_queue *async_bfqq[2][IOPRIO_NR_LEVELS];
 	struct bfq_queue *async_idle_bfqq;

block/bfq-wf2q.c

@@ -222,9 +222,8 @@ static void bfq_inc_active_entities(struct bfq_entity *entity)
 {
 	struct bfq_sched_data *sd = entity->sched_data;
 	struct bfq_group *bfqg = container_of(sd, struct bfq_group, sched_data);
-	struct bfq_data *bfqd = (struct bfq_data *)bfqg->bfqd;
 
-	if (bfqg != bfqd->root_group)
+	if (bfqg != bfqg->bfqd->root_group)
 		bfqg->active_entities++;
 }
 
@@ -232,9 +231,8 @@ static void bfq_dec_active_entities(struct bfq_entity *entity)
 {
 	struct bfq_sched_data *sd = entity->sched_data;
 	struct bfq_group *bfqg = container_of(sd, struct bfq_group, sched_data);
-	struct bfq_data *bfqd = (struct bfq_data *)bfqg->bfqd;
 
-	if (bfqg != bfqd->root_group)
+	if (bfqg != bfqg->bfqd->root_group)
 		bfqg->active_entities--;
 }