linux-kernel - [RFC v4 1/4] block: Introduce blk_bio_map

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Message-Id: <311c342ac55d36ab03e44c31dc65ebfa24cbc8aa.1465301616.git.baolin.wang@linaro.org>
Date:	Tue,  7 Jun 2016 20:17:04 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	axboe@...nel.dk, agk@...hat.com, snitzer@...hat.com,
	dm-devel@...hat.com, herbert@...dor.apana.org.au,
	davem@...emloft.net
Cc:	ebiggers3@...il.com, js1304@...il.com, tadeusz.struk@...el.com,
	smueller@...onox.de, standby24x7@...il.com, shli@...nel.org,
	dan.j.williams@...el.com, martin.petersen@...cle.com,
	sagig@...lanox.com, kent.overstreet@...il.com,
	keith.busch@...el.com, tj@...nel.org, ming.lei@...onical.com,
	broonie@...nel.org, arnd@...db.de, linux-crypto@...r.kernel.org,
	linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, baolin.wang@...aro.org
Subject: [RFC v4 1/4] block: Introduce blk_bio_map_sg() to map one bio

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

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 block/blk-merge.c      |   19 +++++++++++++++++++
 include/linux/blkdev.h |    2 ++
 2 files changed, 21 insertions(+)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 2613531..bca0609 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -417,6 +417,25 @@ single_segment:
 }
 
 /*
+ * Map a bio to scatterlist, return number of sg entries setup. Caller must
+ * make sure sg can hold bio segments entries and detach the bio from list.
+ */
+int blk_bio_map_sg(struct request_queue *q, struct bio *bio,
+		   struct scatterlist *sglist)
+{
+	struct scatterlist *sg = NULL;
+	int nsegs;
+
+	nsegs = __blk_bios_map_sg(q, bio, sglist, &sg);
+
+	if (sg)
+		sg_mark_end(sg);
+
+	return nsegs;
+}
+EXPORT_SYMBOL(blk_bio_map_sg);
+
+/*
  * map a request to scatterlist, return number of sg entries setup. Caller
  * must make sure sg can hold rq->nr_phys_segments entries
  */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3d9cf32..cbe31f9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1024,6 +1024,8 @@ extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fu
 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_bio_map_sg(struct request_queue *q, struct bio *bio,
+			  struct scatterlist *sglist);
 extern void blk_dump_rq_flags(struct request *, char *);
 extern long nr_blockdev_pages(void);
 
-- 
1.7.9.5