linux-kernel - [PATCH RFC 1/2] fs/iomap/direct-io: pass NOWAIT to bio flags

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Message-ID: <158860769311.32485.8003552176738816448.stgit@buzz>
Date:   Mon, 04 May 2020 18:54:53 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@...radead.org>
Subject: [PATCH RFC 1/2] fs/iomap/direct-io: pass NOWAIT to bio flags

This is required to avoid waiting in lower layers.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
---
 fs/iomap/direct-io.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 20dde5aadcdd..9b53fa7651e3 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -63,6 +63,8 @@ static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap,
 {
 	atomic_inc(&dio->ref);
 
+	if (dio->iocb->ki_flags & IOCB_NOWAIT)
+		bio->bi_opf |= REQ_NOWAIT;
 	if (dio->iocb->ki_flags & IOCB_HIPRI)
 		bio_set_polled(bio, dio->iocb);