[PATCH 5/7] direct-io: only use block polling if explicitly requested
From: Christoph Hellwig <hch@lst.de>
Date: 2016-02-22 17:08:04
Also in:
linux-api
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/direct-io.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index d6a9012..0a8d937 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c@@ -445,7 +445,8 @@ static struct bio *dio_await_one(struct dio *dio) __set_current_state(TASK_UNINTERRUPTIBLE); dio->waiter = current; spin_unlock_irqrestore(&dio->bio_lock, flags); - if (!blk_poll(bdev_get_queue(dio->bio_bdev), dio->bio_cookie)) + if (!(dio->iocb->ki_flags & IOCB_HIPRI) || + !blk_poll(bdev_get_queue(dio->bio_bdev), dio->bio_cookie)) io_schedule(); /* wake up sets us TASK_RUNNING */ spin_lock_irqsave(&dio->bio_lock, flags);
--
2.1.4