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From:   SelvaKumar S <selvakuma.s1@samsung.com>
To:     linux-nvme@lists.infradead.org
Cc:     kbusch@kernel.org, axboe@kernel.dk, damien.lemoal@wdc.com,
        Johannes.Thumshirn@wdc.com, hch@lst.de, sagi@grimberg.me,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
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        dm-devel@redhat.com, snitzer@redhat.com, selvajove@gmail.com,
        nj.shetty@samsung.com, joshi.k@samsung.com,
        javier.gonz@samsung.com, SelvaKumar S <selvakuma.s1@samsung.com>
Subject: [RFC PATCH v4 1/3] block: export bio_map_kern()
Date:   Mon,  4 Jan 2021 16:11:57 +0530
Message-Id: <20210104104159.74236-2-selvakuma.s1@samsung.com>
In-Reply-To: <20210104104159.74236-1-selvakuma.s1@samsung.com>
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References: <20210104104159.74236-1-selvakuma.s1@samsung.com>
        <CGME20210104104245epcas5p26ed395efbf74e78a4e44048a6d7d6ba7@epcas5p2.samsung.com>
Precedence: bulk

Export bio_map_kern() so that copy offload emulation can use
it to add vmalloced memory to bio.

Signed-off-by: SelvaKumar S <selvakuma.s1@samsung.com>
---
 block/blk-map.c        | 3 ++-
 include/linux/blkdev.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/blk-map.c b/block/blk-map.c
index 21630dccac62..50d61475bb68 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -378,7 +378,7 @@ static void bio_map_kern_endio(struct bio *bio)
  *	Map the kernel address into a bio suitable for io to a block
  *	device. Returns an error pointer in case of error.
  */
-static struct bio *bio_map_kern(struct request_queue *q, void *data,
+struct bio *bio_map_kern(struct request_queue *q, void *data,
 		unsigned int len, gfp_t gfp_mask)
 {
 	unsigned long kaddr = (unsigned long)data;
@@ -428,6 +428,7 @@ static struct bio *bio_map_kern(struct request_queue *q, void *data,
 	bio->bi_end_io = bio_map_kern_endio;
 	return bio;
 }
+EXPORT_SYMBOL(bio_map_kern);
 
 static void bio_copy_kern_endio(struct bio *bio)
 {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 070de09425ad..81f9e7bec16c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -936,6 +936,8 @@ extern int blk_rq_map_user(struct request_queue *, struct request *,
 			   struct rq_map_data *, void __user *, unsigned long,
 			   gfp_t);
 extern int blk_rq_unmap_user(struct bio *);
+extern struct bio *bio_map_kern(struct request_queue *q, void *data,
+				unsigned int len, gfp_t gfp_mask);
 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
 			       struct rq_map_data *, const struct iov_iter *,
-- 
2.25.1