linux-kernel - [PATCH v6 5/5] dm-crypt: Fix lost ioprio when queuing write bios

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Message-Id: <20231220100333.107049-6-hongyu.jin.cn@gmail.com>
Date: Wed, 20 Dec 2023 18:03:33 +0800
From: Hongyu Jin <hongyu.jin.cn@...il.com>
To: agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com,
	axboe@...nel.dk,
	ebiggers@...nel.org
Cc: zhiguo.niu@...soc.com,
	ke.wang@...soc.com,
	yibin.ding@...soc.com,
	hongyu.jin@...soc.com,
	linux-kernel@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-block@...r.kernel.org
Subject: [PATCH v6 5/5] dm-crypt: Fix lost ioprio when queuing write bios

From: Hongyu Jin <hongyu.jin@...soc.com>

Since dm-crypt queues writes to a different kernel thread (workqueue),
the bios will dispatch from tasks with different io_context->ioprio
settings and blkcg than the submitting task, thus giving incorrect
ioprio to the io scheduler.

Get the original io priority setting via struct dm_crypt_io::base_bio
and set this priority to the bio for write.

Link: https://lore.kernel.org/dm-devel/alpine.LRH.2.11.1612141049250.13402@mail.ewheeler.net

Signed-off-by: Hongyu Jin <hongyu.jin@...soc.com>
---
 drivers/md/dm-crypt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 2ae8560b6a14..ba6e794f7871 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1683,6 +1683,7 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size)
 				 GFP_NOIO, &cc->bs);
 	clone->bi_private = io;
 	clone->bi_end_io = crypt_endio;
+	clone->bi_ioprio = io->base_bio->bi_ioprio;
 
 	remaining_size = size;
 
-- 
2.34.1