[RFC B 1/2] Export new blk_make_request() which takes bio and returns request

[Boaz Harrosh <bharrosh@panasas.com>]

given a struct bio allocates a new request. This is the parallel of
generic_make_request for BLOCK_PC commands users.

The new API is:
+struct request *blk_make_request(struct request_queue *q, struct bio *bio,
+				 gfp_t gfp_mask);

This is in the effort of un-exporting blk_rq_append_bio()

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 block/blk-core.c       |   13 +++++++++++++
 include/linux/blkdev.h |    5 ++++-
 2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 9ee243e..7136c11 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -903,6 +903,19 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(blk_get_request);
 
+struct request *blk_make_request(struct request_queue *q, struct bio *bio,
+				 gfp_t gfp_mask)
+{
+	struct request *rq = blk_get_request(q, bio_data_dir(bio), gfp_mask);
+
+	if (rq) {
+		blk_rq_bio_prep(q, rq, bio);
+		blk_queue_bounce(q, &rq->bio);
+	}
+	return rq;
+}
+EXPORT_SYMBOL(blk_make_request);
+
 /**
  * blk_start_queueing - initiate dispatch of requests to device
  * @q:		request queue to kick into gear
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 465d6ba..22dcdde 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -729,6 +729,8 @@ extern void blk_rq_init(struct request_queue *q, struct request *rq);
 extern void blk_put_request(struct request *);
 extern void __blk_put_request(struct request_queue *, struct request *);
 extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
+extern struct request *blk_make_request(struct request_queue *, struct bio *,
+					gfp_t);
 extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
 extern void blk_requeue_request(struct request_queue *, struct request *);
 extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);