block: rename __make_request() to blk_queue_bio()

Now that it's exported, lets put it in a more sane namespace.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 56ef387..ab673f0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -540,7 +540,7 @@
 	/*
 	 * This also sets hw/phys segments, boundary and size
 	 */
-	blk_queue_make_request(q, __make_request);
+	blk_queue_make_request(q, blk_queue_bio);
 
 	q->sg_reserved_size = INT_MAX;
 
@@ -1211,7 +1211,7 @@
 	blk_rq_bio_prep(req->q, req, bio);
 }
 
-int __make_request(struct request_queue *q, struct bio *bio)
+int blk_queue_bio(struct request_queue *q, struct bio *bio)
 {
 	const bool sync = !!(bio->bi_rw & REQ_SYNC);
 	struct blk_plug *plug;
@@ -1315,7 +1315,7 @@
 out:
 	return 0;
 }
-EXPORT_SYMBOL_GPL(__make_request);	/* for device mapper only */
+EXPORT_SYMBOL_GPL(blk_queue_bio);	/* for device mapper only */
 
 /*
  * If bio->bi_dev is a partition, remap the location