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Commit 391f552a authored by Liu Bo's avatar Liu Bo Committed by Jens Axboe
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Blk-iolatency: warn on negative inflight IO counter 



This is to catch any unexpected negative value of inflight IO counter.

Signed-off-by: default avatarLiu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8c772a9b

block/blk-iolatency.c

+3 −1
Original line number Diff line number Diff line
@@ -592,6 +592,7 @@ static void blkcg_iolatency_done_bio(struct rq_qos *rqos, struct bio *bio) 
	u64 now = ktime_to_ns(ktime_get());

	bool issue_as_root = bio_issue_as_root_blkg(bio);

	bool enabled = false;

	int inflight = 0;



	blkg = bio->bi_blkg;

	if (!blkg || !bio_flagged(bio, BIO_TRACKED))
@@ -613,7 +614,8 @@ static void blkcg_iolatency_done_bio(struct rq_qos *rqos, struct bio *bio) 
		}

		rqw = &iolat->rq_wait;



		atomic_dec(&rqw->inflight);

		inflight = atomic_dec_return(&rqw->inflight);

		WARN_ON_ONCE(inflight < 0);

		if (iolat->min_lat_nsec == 0)

			goto next;

		iolatency_record_time(iolat, &bio->bi_issue, now,