linux-kernel - [PATCH] blk-mq: do not update io_ticks with passthrough requests

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Message-Id: <20220530064059.1120058-1-haisuwang@tencent.com>
Date:   Mon, 30 May 2022 14:40:59 +0800
From:   iamhswang@...il.com
To:     axboe@...nel.dk
Cc:     zhangwensheng5@...wei.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Haisu Wang <haisuwang@...cent.com>,
        samuelliao <samuelliao@...cent.com>
Subject: [PATCH] blk-mq: do not update io_ticks with passthrough requests

From: Haisu Wang <haisuwang@...cent.com>

Flush or passthrough requests are not accounted as normal IO in completion.
To reflect iostat for slow IO, io_ticks is updated when stat show called
based on inflight numbers.
It may cause inconsistent io_ticks calculation result.

So do not account non-passthrough request when check inflight.

Fixes: 86d7331299fd ("block: update io_ticks when io hang")
Signed-off-by: Haisu Wang <haisuwang@...cent.com>
Reviewed-by: samuelliao <samuelliao@...cent.com>
---
 block/blk-mq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index ae116b755648..3912cae42da3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -133,7 +133,8 @@ static bool blk_mq_check_inflight(struct request *rq, void *priv,
 {
 	struct mq_inflight *mi = priv;
 
-	if ((!mi->part->bd_partno || rq->part == mi->part) &&
+	if (rq->part && blk_do_io_stat(rq) &&
+	    (!mi->part->bd_partno || rq->part == mi->part) &&
 	    blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT)
 		mi->inflight[rq_data_dir(rq)]++;
 
-- 
2.27.0