linux-kernel - [PATCH 5.17 078/158] block/mq-deadline: Set the fifo

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Message-Id: <20220523165843.956480333@linuxfoundation.org>
Date:   Mon, 23 May 2022 19:03:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Bart Van Assche <bvanassche@....org>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 078/158] block/mq-deadline: Set the fifo_time member also if inserting at head

From: Bart Van Assche <bvanassche@....org>

[ Upstream commit 725f22a1477c9c15aa67ad3af96fe28ec4fe72d2 ]

Before commit 322cff70d46c the fifo_time member of requests on a dispatch
list was not used. Commit 322cff70d46c introduces code that reads the
fifo_time member of requests on dispatch lists. Hence this patch that sets
the fifo_time member when adding a request to a dispatch list.

Cc: Christoph Hellwig <hch@....de>
Cc: Ming Lei <ming.lei@...hat.com>
Cc: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Fixes: 322cff70d46c ("block/mq-deadline: Prioritize high-priority requests")
Signed-off-by: Bart Van Assche <bvanassche@....org>
Link: https://lore.kernel.org/r/20220513171307.32564-1-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/mq-deadline.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/mq-deadline.c b/block/mq-deadline.c
index 3ed5eaf3446a..6ed602b2f80a 100644
--- a/block/mq-deadline.c
+++ b/block/mq-deadline.c
@@ -742,6 +742,7 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
 
 	if (at_head) {
 		list_add(&rq->queuelist, &per_prio->dispatch);
+		rq->fifo_time = jiffies;
 	} else {
 		deadline_add_rq_rb(per_prio, rq);
 
-- 
2.35.1