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block, bfq: cleanup 'bfqg->online' 

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2175212

commit f37bf75ca73d523ebaa7ceb44c45d8ecd05374fe
Author: Yu Kuai <yukuai3@huawei.com>
Date:   Thu Feb 2 21:49:13 2023 +0800

    block, bfq: cleanup 'bfqg->online'

    After commit dfd6200a0954 ("blk-cgroup: support to track if policy is
    online"), there is no need to do this again in bfq.

    However, 'pd->online' is not protected by 'bfqd->lock', in order to make
    sure bfq won't see that 'pd->online' is still set after bfq_pd_offline(),
    clear it before bfq_pd_offline() is called. This is fine because other
    polices doesn't use 'pd->online' and bfq_pd_offline() will move active
    bfqq to root cgroup anyway.

    Signed-off-by: Yu Kuai <yukuai3@huawei.com>
    Reviewed-by: Jan Kara <jack@suse.cz>
    Link: https://lore.kernel.org/r/20230202134913.2364549-1-yukuai1@huaweicloud.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Ming Lei <ming.lei@redhat.com>
This commit is contained in:
Ming Lei 2023-02-02 21:49:13 +08:00
parent 87bb3f8f17
commit 3feaacc608
3 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
block/bfq-cgroup.c
View File

@ -551,7 +551,6 @@ static void bfq_pd_init(struct blkg_policy_data *pd)
bfqg->bfqd = bfqd;
bfqg->active_entities = 0;
bfqg->num_queues_with_pending_reqs = 0;
bfqg->online = true;
bfqg->rq_pos_tree = RB_ROOT;
}
@ -614,7 +613,7 @@ struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio)
continue;
}
bfqg = blkg_to_bfqg(blkg);
if (bfqg->online) {
if (bfqg->pd.online) {
bio_associate_blkg_from_css(bio, &blkg->blkcg->css);
return bfqg;
}
@ -985,7 +984,6 @@ 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

@ -1009,8 +1009,6 @@ struct bfq_group {
/* reference counter (see comments in bfq_bic_update_cgroup) */
refcount_t ref;
/* Is bfq_group still online? */
bool online;
struct bfq_entity entity;
struct bfq_sched_data sched_data;

2
block/blk-cgroup.c
View File

@ -480,9 +480,9 @@ static void blkg_destroy(struct blkcg_gq *blkg)
struct blkcg_policy *pol = blkcg_policy[i];
if (blkg->pd[i] && blkg->pd[i]->online) {
blkg->pd[i]->online = false;
if (pol->pd_offline_fn)
pol->pd_offline_fn(blkg->pd[i]);
blkg->pd[i]->online = false;
}
}