From: Jan Kara Date: Fri, 1 Apr 2022 10:27:48 +0000 (+0200) Subject: bfq: Track whether bfq_group is still online X-Git-Tag: v5.17.14~142 X-Git-Url: https://git.fsl.cs.stonybrook.edu/?a=commitdiff_plain;h=1fcb17c24d1cac8cb995e90e67a6432b46dbc0b5;p=wrapfs-5.17.y.git bfq: Track whether bfq_group is still online commit 09f871868080c33992cd6a9b72a5ca49582578fa upstream. 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)" Signed-off-by: Jan Kara Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20220401102752.8599-7-jack@suse.cz Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c index 6a7f2b7822a5..f0b265258891 100644 --- a/block/bfq-cgroup.c +++ b/block/bfq-cgroup.c @@ -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; @@ -971,6 +971,7 @@ 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); /* diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index 3773401623ad..2ded8b1e18a9 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -930,6 +930,8 @@ 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;