linux-kernel - [PATCH v2 1/2] block: Export the __blk_bios_map

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Date:	Wed, 16 Dec 2015 11:18:35 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	axboe@...nel.dk, agk@...hat.com, snitzer@...hat.com,
	dm-devel@...hat.com
Cc:	neilb@...e.com, dan.j.williams@...el.com,
	martin.petersen@...cle.com, sagig@...lanox.com,
	kent.overstreet@...il.com, keith.busch@...el.com, tj@...nel.org,
	broonie@...nel.org, arnd@...db.de, linux-block@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	baolin.wang@...aro.org
Subject: [PATCH v2 1/2] block: Export the __blk_bios_map_sg() to map one bio

In dm-crypt, it need to map one bio to scatterlist for improving the
encryption efficiency. Thus this patch exports the __blk_bios_map_sg()
function to map one bio with scatterlists.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 block/blk-merge.c      |    7 ++++---
 include/linux/blkdev.h |    3 +++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index de5716d8..09cc7c4 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -331,9 +331,9 @@ new_segment:
 	*bvprv = *bvec;
 }
 
-static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
-			     struct scatterlist *sglist,
-			     struct scatterlist **sg)
+int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
+		      struct scatterlist *sglist,
+		      struct scatterlist **sg)
 {
 	struct bio_vec bvec, bvprv = { NULL };
 	struct bvec_iter iter;
@@ -372,6 +372,7 @@ single_segment:
 
 	return nsegs;
 }
+EXPORT_SYMBOL(__blk_bios_map_sg);
 
 /*
  * map a request to scatterlist, return number of sg entries setup. Caller
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3fe27f8..dd8d10f 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1004,6 +1004,9 @@ extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
 
 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
+extern int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
+			     struct scatterlist *sglist,
+			     struct scatterlist **sg);
 extern void blk_dump_rq_flags(struct request *, char *);
 extern long nr_blockdev_pages(void);
 
-- 
1.7.9.5

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