From: Dennis Zhou <dennis@xxxxxxxxxx> [ Upstream commit a3fb01ba5af066521f3f3421839e501bb2c71805 ] As is, iolatency recognizes done_bio and cleanup as ending paths. If a request is marked REQ_NOWAIT and fails to get a request, the bio is cleaned up via rq_qos_cleanup() and ended in bio_wouldblock_error(). This results in underflowing the inflight counter. Fix this by only accounting bios that were actually submitted. Signed-off-by: Dennis Zhou <dennis@xxxxxxxxxx> Cc: Josef Bacik <josef@xxxxxxxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- block/blk-iolatency.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index d22e61bced86..c91b84bb9d0a 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -600,6 +600,10 @@ static void blkcg_iolatency_done_bio(struct rq_qos *rqos, struct bio *bio) if (!blkg || !bio_flagged(bio, BIO_TRACKED)) return; + /* We didn't actually submit this bio, don't account it. */ + if (bio->bi_status == BLK_STS_AGAIN) + return; + iolat = blkg_to_lat(bio->bi_blkg); if (!iolat) return; -- 2.20.1
