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bfq: Track whether bfq_group is still online 

Track whether bfq_group is still online. We cannot rely on
blkcg_gq->online because that gets cleared only after all policies are
offlined and we need something that gets updated already under
bfqd->lock when we are cleaning up our bfq_group to be able to guarantee
that when we see online bfq_group, it will stay online while we are
holding bfqd->lock lock.

CC: stable@vger.kernel.org
Tested-by: "yukuai (C)" <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220401102752.8599-7-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2022-04-01 12:27:48 +02:00 committed by Jens Axboe
parent 5f550ede5e
commit 09f8718680
2 changed files with 4 additions and 1 deletions
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3
block/bfq-cgroup.c
View File

@ -557,6 +557,7 @@ static void bfq_pd_init(struct blkg_policy_data *pd)
*/
bfqg->bfqd = bfqd;
bfqg->active_entities = 0;
bfqg->online = true;
bfqg->rq_pos_tree = RB_ROOT;
}
@ -603,7 +604,6 @@ struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd,
struct bfq_entity *entity;
bfqg = bfq_lookup_bfqg(bfqd, blkcg);
if (unlikely(!bfqg))
return NULL;
@ -979,6 +979,7 @@ static void bfq_pd_offline(struct blkg_policy_data *pd)
put_async_queues:
bfq_put_async_queues(bfqd, bfqg);
bfqg->online = false;
spin_unlock_irqrestore(&bfqd->lock, flags);
/*

2
block/bfq-iosched.h
View File

@ -928,6 +928,8 @@ struct bfq_group {
/* reference counter (see comments in bfq_bic_update_cgroup) */
int ref;
/* Is bfq_group still online? */
bool online;
struct bfq_entity entity;
struct bfq_sched_data sched_data;