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direct-io: only use block polling if explicitly requested 

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stephen Bates <stephen.bates@pmcs.com>
Tested-by: Stephen Bates <stephen.bates@pmcs.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2016-03-03 16:04:02 +01:00 committed by Al Viro
parent 97be7ebe53
commit c43c83a294
1 changed files with 2 additions and 1 deletions
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3
fs/direct-io.c
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@ -445,7 +445,8 @@ static struct bio *dio_await_one(struct dio *dio)
__set_current_state(TASK_UNINTERRUPTIBLE); __set_current_state(TASK_UNINTERRUPTIBLE);
dio->waiter = current; dio->waiter = current;
spin_unlock_irqrestore(&dio->bio_lock, flags); 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(); io_schedule();
/* wake up sets us TASK_RUNNING */ /* wake up sets us TASK_RUNNING */
spin_lock_irqsave(&dio->bio_lock, flags); spin_lock_irqsave(&dio->bio_lock, flags);