[PATCH 5.19 18/38] block: blk_queue_enter() / __bio_queue_enter() must return -EAGAIN for nowait

From: Greg Kroah-Hartman
Date: Wed Sep 21 2022 - 11:48:29 EST


From: Stefan Roesch <shr@xxxxxx>

[ Upstream commit 56f99b8d06ef1ed1c9730948f9f05ac2b930a20b ]

Today blk_queue_enter() and __bio_queue_enter() return -EBUSY for the
nowait code path. This is not correct: they should return -EAGAIN
instead.

This problem was detected by fio. The following command exposed the
above problem:

t/io_uring -p0 -d128 -b4096 -s32 -c32 -F1 -B0 -R0 -X1 -n24 -P1 -u1 -O0 /dev/ng0n1

By applying the patch, the retry case is handled correctly in the slow
path.

Signed-off-by: Stefan Roesch <shr@xxxxxx>
Fixes: bfd343aa1718 ("blk-mq: don't wait in blk_mq_queue_enter() if __GFP_WAIT isn't set")
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
block/blk-core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 27fb1357ad4b..cc6fbcb6d252 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -338,7 +338,7 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)

while (!blk_try_enter_queue(q, pm)) {
if (flags & BLK_MQ_REQ_NOWAIT)
- return -EBUSY;
+ return -EAGAIN;

/*
* read pair of barrier in blk_freeze_queue_start(), we need to
@@ -368,7 +368,7 @@ int __bio_queue_enter(struct request_queue *q, struct bio *bio)
if (test_bit(GD_DEAD, &disk->state))
goto dead;
bio_wouldblock_error(bio);
- return -EBUSY;
+ return -EAGAIN;
}

/*
--
2.35.1