[PATCH V11 3/4] nvmet: add nvmet_req_bio put helper for backends

[Chaitanya Kulkarni]

With the addition of zns backend now we have three different backends
with inline bio optimization. That leads to having duplicate code in
for freeing the bio in all three backends: generic bdev, passsthru and 
generic zns.

Add a helper function to avoid duplicate code and update the 
respective backends.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
---
 drivers/nvme/target/io-cmd-bdev.c | 3 +--
 drivers/nvme/target/nvmet.h       | 6 ++++++
 drivers/nvme/target/passthru.c    | 3 +--
 drivers/nvme/target/zns.c         | 3 +--
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
index ada0215f5e56..ca39d787d71f 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -173,8 +173,7 @@ static void nvmet_bio_done(struct bio *bio)
 	struct nvmet_req *req = bio->bi_private;
 
 	nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
-	if (bio != &req->b.inline_bio)
-		bio_put(bio);
+	nvmet_req_bio_put(req, bio);
 }
 
 #ifdef CONFIG_BLK_DEV_INTEGRITY
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index f3fccc49de03..2f1bd3ac34a2 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -654,4 +654,10 @@ static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba)
 	return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT);
 }
 
+static inline void nvmet_req_bio_put(struct nvmet_req *req, struct bio *bio)
+{
+	if (bio != &req->b.inline_bio)
+		bio_put(bio);
+}
+
 #endif /* _NVMET_H */
diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c
index 26c587ccd152..011aeebace55 100644
--- a/drivers/nvme/target/passthru.c
+++ b/drivers/nvme/target/passthru.c
@@ -206,8 +206,7 @@ static int nvmet_passthru_map_sg(struct nvmet_req *req, struct request *rq)
 	for_each_sg(req->sg, sg, req->sg_cnt, i) {
 		if (bio_add_pc_page(rq->q, bio, sg_page(sg), sg->length,
 				    sg->offset) < sg->length) {
-			if (bio != &req->p.inline_bio)
-				bio_put(bio);
+			nvmet_req_bio_put(req, bio);
 			return -EINVAL;
 		}
 	}
diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
index 8121b29df766..42f16ce55fa0 100644
--- a/drivers/nvme/target/zns.c
+++ b/drivers/nvme/target/zns.c
@@ -321,7 +321,6 @@ void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
 						 bio->bi_iter.bi_sector);
 
 out_bio_put:
-	if (bio != &req->b.inline_bio)
-		bio_put(bio);
+	nvmet_req_bio_put(req, bio);
 	nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL : status);
 }
-- 
2.22.1