linux-kernel - [RFC PATCH v4 1/3] block: export bio_map

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Date:   Mon,  4 Jan 2021 16:11:57 +0530
From:   SelvaKumar S <selvakuma.s1@...sung.com>
To:     linux-nvme@...ts.infradead.org
Cc:     kbusch@...nel.org, axboe@...nel.dk, damien.lemoal@....com,
        Johannes.Thumshirn@....com, hch@....de, sagi@...mberg.me,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        bvanassche@....org, mpatocka@...hat.com, hare@...e.de,
        dm-devel@...hat.com, snitzer@...hat.com, selvajove@...il.com,
        nj.shetty@...sung.com, joshi.k@...sung.com,
        javier.gonz@...sung.com, SelvaKumar S <selvakuma.s1@...sung.com>
Subject: [RFC PATCH v4 1/3] block: export bio_map_kern()

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@...sung.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