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block: BFQ: Add several invariant checks 

If anything goes wrong with the counters that track the number of
requests, I/O locks up. Make such scenarios easier to debug by adding
invariant checks for the request counters. Additionally, check that
BFQ queues are empty before these are freed.

Cc: Jan Kara <jack@suse.cz>
Cc: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230516223853.1385255-1-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2023-05-16 15:38:53 -07:00 committed by Jens Axboe
parent a036e698c2
commit 3e49c1e4a6
1 changed files with 9 additions and 0 deletions
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9
block/bfq-iosched.c
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@ -5403,6 +5403,9 @@ void bfq_put_queue(struct bfq_queue *bfqq)
if (bfqq->bfqd->last_completed_rq_bfqq == bfqq)
bfqq->bfqd->last_completed_rq_bfqq = NULL;
WARN_ON_ONCE(!list_empty(&bfqq->fifo));
WARN_ON_ONCE(!RB_EMPTY_ROOT(&bfqq->sort_list));
kmem_cache_free(bfq_pool, bfqq);
bfqg_and_blkg_put(bfqg);
}
@ -7135,6 +7138,7 @@ static void bfq_exit_queue(struct elevator_queue *e)
{
struct bfq_data *bfqd = e->elevator_data;
struct bfq_queue *bfqq, *n;
unsigned int actuator;
hrtimer_cancel(&bfqd->idle_slice_timer);
@ -7143,6 +7147,11 @@ static void bfq_exit_queue(struct elevator_queue *e)
bfq_deactivate_bfqq(bfqd, bfqq, false, false);
spin_unlock_irq(&bfqd->lock);
for (actuator = 0; actuator < bfqd->num_actuators; actuator++)
WARN_ON_ONCE(bfqd->rq_in_driver[actuator]);
WARN_ON_ONCE(bfqd->tot_rq_in_driver);
WARN_ON_ONCE(bfqq->dispatched);
hrtimer_cancel(&bfqd->idle_slice_timer);
/* release oom-queue reference to root group */