commit ea435e1b9392a33deceaea2a16ebaa3397bead93
author Christoph Hellwig <hch@lst.de> Thu Nov 02 21:29:54 2017 +0300
committer Jens Axboe <axboe@kernel.dk> Fri Nov 03 10:31:48 2017 -0600
tree 73c80a2bfed2bc37cedc4d38d9534e231c61dbd8
parent 8ddcd653257c18a669fcb75ee42c37054908e0d6

block: add a poll_fn callback to struct request_queue

That we we can also poll non blk-mq queues.  Mostly needed for
the NVMe multipath code, but could also be useful elsewhere.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 07ddccd..4afa4d5 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -237,7 +237,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
 		if (!READ_ONCE(bio.bi_private))
 			break;
 		if (!(iocb->ki_flags & IOCB_HIPRI) ||
-		    !blk_mq_poll(bdev_get_queue(bdev), qc))
+		    !blk_poll(bdev_get_queue(bdev), qc))
 			io_schedule();
 	}
 	__set_current_state(TASK_RUNNING);
@@ -402,7 +402,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
 			break;
 
 		if (!(iocb->ki_flags & IOCB_HIPRI) ||
-		    !blk_mq_poll(bdev_get_queue(bdev), qc))
+		    !blk_poll(bdev_get_queue(bdev), qc))
 			io_schedule();
 	}
 	__set_current_state(TASK_RUNNING);