[PATCH RFT/RFC 1/4] export block layer helpers

Export some block layer helpers need to perform async
operations.

Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>

diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -2302,6 +2302,8 @@ void blk_execute_rq_nowait(request_queue
        generic_unplug_device(q);
 }
 
+EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
+
 /**
  * blk_execute_rq - insert a request into queue for execution
  * @q:         queue to insert the request in
@@ -2445,7 +2447,7 @@ void disk_round_stats(struct gendisk *di
 /*
  * queue lock must be held
  */
-static void __blk_put_request(request_queue_t *q, struct request *req)
+void __blk_put_request(request_queue_t *q, struct request *req)
 {
        struct request_list *rl = req->rl;
 
@@ -2473,6 +2475,8 @@ static void __blk_put_request(request_qu
        }
 }
 
+EXPORT_SYMBOL_GPL(__blk_put_request);
+
 void blk_put_request(struct request *req)
 {
        /*
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -548,6 +548,7 @@ extern void blk_unregister_queue(struct 
 extern void register_disk(struct gendisk *dev);
 extern void generic_make_request(struct bio *bio);
 extern void blk_put_request(struct request *);
+extern void __blk_put_request(request_queue_t *, struct request *);
 extern void blk_end_sync_rq(struct request *rq);
 extern void blk_attempt_remerge(request_queue_t *, struct request *);
 extern struct request *blk_get_request(request_queue_t *, int, int);
@@ -569,6 +570,10 @@ extern int blk_rq_map_kern(request_queue
 extern int blk_rq_map_user_iov(request_queue_t *, struct request *, struct 
sg_iovec *, int);
 extern int blk_execute_rq(request_queue_t *, struct gendisk *,
                          struct request *, int);
+extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *,
+                                 struct request *, int,
+                                 void (*done)(struct request *));
+
 static inline request_queue_t *bdev_get_queue(struct block_device *bdev)
 {
        return bdev->bd_disk->queue;