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blk-cgroup: pin the gendisk in struct blkcg_gq

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Currently each blkcg_gq holds a request_queue reference, which is what
is used in the policies.  But a lot of these interfaces will move over to
use a gendisk, so store a disk in struct blkcg_gq and hold a reference to
it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230203150400.3199230-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-02-03 16:03:47 +01:00
committed by Jens Axboe
parent 180b04d450
commit 84d7d462b1
7 changed files with 32 additions and 34 deletions
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4
block/blk-throttle.c
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@@ -388,7 +388,7 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
{
struct throtl_grp *tg = pd_to_tg(pd);
struct blkcg_gq *blkg = tg_to_blkg(tg);
struct throtl_data *td = blkg->q->td;
struct throtl_data *td = blkg->disk->queue->td;
struct throtl_service_queue *sq = &tg->service_queue;
/*
@@ -1175,7 +1175,7 @@ static void throtl_pending_timer_fn(struct timer_list *t)
/* throtl_data may be gone, so figure out request queue by blkg */
if (tg)
q = tg->pd.blkg->q;
q = tg->pd.blkg->disk->queue;
else
q = td->queue;