[PATCH AUTOSEL 5.4 13/13] block: don't ignore REQ_NOWAIT for direct IO

[Sasha Levin]

From: Pavel Begunkov <asml.sile...@gmail.com>

[ Upstream commit f8b78caf21d5bc3fcfc40c18898f9d52ed1451a5 ]

If IOCB_NOWAIT is set on submission, then that needs to get propagated to
REQ_NOWAIT on the block side. Otherwise we completely lose this
information, and any issuer of IOCB_NOWAIT IO will potentially end up
blocking on eg request allocation on the storage side.

Signed-off-by: Pavel Begunkov <asml.sile...@gmail.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 fs/block_dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 79272cdbe827..bd93563477a4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -246,6 +246,8 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct 
iov_iter *iter,
                bio.bi_opf = dio_bio_write_op(iocb);
                task_io_account_write(ret);
        }
+       if (iocb->ki_flags & IOCB_NOWAIT)
+               bio.bi_opf |= REQ_NOWAIT;
        if (iocb->ki_flags & IOCB_HIPRI)
                bio_set_polled(&bio, iocb);
 
@@ -399,6 +401,8 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter 
*iter, int nr_pages)
                        bio->bi_opf = dio_bio_write_op(iocb);
                        task_io_account_write(bio->bi_iter.bi_size);
                }
+               if (iocb->ki_flags & IOCB_NOWAIT)
+                       bio->bi_opf |= REQ_NOWAIT;
 
                dio->size += bio->bi_iter.bi_size;
                pos += bio->bi_iter.bi_size;
-- 
2.30.2