block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT
[ Upstream commit c58c1f83 ] Non-mq devs do not honor REQ_NOWAIT so give a chance to the caller to repeat request gracefully on -EAGAIN error. The problem is well reproduced using io_uring: mkfs.ext4 /dev/ram0 mount /dev/ram0 /mnt # Preallocate a file dd if=/dev/zero of=/mnt/file bs=1M count=1 # Start fio with io_uring and get -EIO fio --rw=write --ioengine=io_uring --size=1M --direct=1 --name=job --filename=/mnt/file Signed-off-by:Roman Penyaev <rpenyaev@suse.de> Signed-off-by:
Jens Axboe <axboe@kernel.dk> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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e36491f1
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