diff options
| author | Roman Penyaev <rpenyaev@suse.de> | 2019-12-17 16:54:07 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-12-17 17:01:43 +0100 |
| commit | c58c1f83436b501d45d4050fd1296d71a9760bcb (patch) | |
| tree | 4c969a564987faf83e96654aa5f720ad4c963a76 /block | |
| parent | nbd: fix shutdown and recv work deadlock v2 (diff) | |
| download | linux-c58c1f83436b501d45d4050fd1296d71a9760bcb.tar.xz linux-c58c1f83436b501d45d4050fd1296d71a9760bcb.zip | |
block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index e0a094fddee5..089e890ab208 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -885,11 +885,14 @@ generic_make_request_checks(struct bio *bio) } /* - * For a REQ_NOWAIT based request, return -EOPNOTSUPP - * if queue is not a request based queue. + * Non-mq queues do not honor REQ_NOWAIT, so complete a bio + * with BLK_STS_AGAIN status in order to catch -EAGAIN and + * to give a chance to the caller to repeat request gracefully. */ - if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q)) - goto not_supported; + if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q)) { + status = BLK_STS_AGAIN; + goto end_io; + } if (should_fail_bio(bio)) goto end_io; |