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dm crypt: Fix IO priority lost when queuing write bios

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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 in 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@unisoc.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Hongyu Jin 2024-01-24 13:35:56 +08:00 committed by Mike Snitzer
parent d95e2c34a3
commit 5d8d408153
1 changed files with 1 additions and 0 deletions
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drivers/md/dm-crypt.c
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@ -1688,6 +1688,7 @@ retry:
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;