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Message-Id: <20240124053556.126468-6-hongyu.jin.cn@gmail.com>
Date: Wed, 24 Jan 2024 13:35:56 +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 v8 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 855b482cbff1..e0804a86946f 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
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