[PATCH V9 6/9] nvmet: add bio init helper for different backends

[Chaitanya Kulkarni]

With the addition of the zns backend now we have two different backends
with the same bio initialization code. That leads to having duplicate
code in two backends: generic bdev and generic zns.

Add a helper function to reduce the duplicate code such that helper
function initializes the various bio initialization parameters such as
bio block device, op flags, sector, end io callback, and private member,

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
---
 drivers/nvme/target/io-cmd-bdev.c |  6 +-----
 drivers/nvme/target/nvmet.h       | 11 +++++++++++
 drivers/nvme/target/zns.c         |  6 +++---
 3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
index 72746e29cb0d..b1fb0bb1f39f 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -267,11 +267,7 @@ static void nvmet_bdev_execute_rw(struct nvmet_req *req)
 	sector = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
 
 	bio = nvmet_req_bio_get(req, NULL);
-	bio_set_dev(bio, req->ns->bdev);
-	bio->bi_iter.bi_sector = sector;
-	bio->bi_private = req;
-	bio->bi_end_io = nvmet_bio_done;
-	bio->bi_opf = op;
+	nvmet_bio_init(bio, req->ns->bdev, op, sector, req, nvmet_bio_done);
 
 	blk_start_plug(&plug);
 	if (req->metadata_len)
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 3fc84f79cce1..1ec9e1b35c67 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -668,4 +668,15 @@ static inline struct bio *nvmet_req_bio_get(struct nvmet_req *req,
 	return bio;
 }
 
+static inline void nvmet_bio_init(struct bio *bio, struct block_device *bdev,
+				  unsigned int op, sector_t sect, void *private,
+				  bio_end_io_t *bi_end_io)
+{
+	bio_set_dev(bio, bdev);
+	bio->bi_opf = op;
+	bio->bi_iter.bi_sector = sect;
+	bio->bi_private = private;
+	bio->bi_end_io = bi_end_io;
+}
+
 #endif /* _NVMET_H */
diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
index c32e93a3c7e1..92213bed0006 100644
--- a/drivers/nvme/target/zns.c
+++ b/drivers/nvme/target/zns.c
@@ -281,6 +281,7 @@ void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
 {
 	sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
 	struct request_queue *q = req->ns->bdev->bd_disk->queue;
+	unsigned int op = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
 	unsigned int max_sects = queue_max_zone_append_sectors(q);
 	u16 status = NVME_SC_SUCCESS;
 	unsigned int total_len = 0;
@@ -297,9 +298,8 @@ void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
 	}
 
 	bio = nvmet_req_bio_get(req, NULL);
-	bio_set_dev(bio, req->ns->bdev);
-	bio->bi_iter.bi_sector = sect;
-	bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
+	nvmet_bio_init(bio, req->ns->bdev, op, sect, NULL, NULL);
+
 	if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
 		bio->bi_opf |= REQ_FUA;
 
-- 
2.22.1