[PATCH V6 2/6] nvmet: add lba to sect conversion helpers

[Chaitanya Kulkarni]

In this preparation patch we add helpers to convert lbas to sectors and
sectors to lba. This is needed to eliminate code duplication in the ZBD
backend.

Use these helpers in the block device backennd.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
---
 drivers/nvme/target/io-cmd-bdev.c |  8 +++-----
 drivers/nvme/target/nvmet.h       | 10 ++++++++++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
index 125dde3f410e..23095bdfce06 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -256,8 +256,7 @@ static void nvmet_bdev_execute_rw(struct nvmet_req *req)
 	if (is_pci_p2pdma_page(sg_page(req->sg)))
 		op |= REQ_NOMERGE;
 
-	sector = le64_to_cpu(req->cmd->rw.slba);
-	sector <<= (req->ns->blksize_shift - 9);
+	sector = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
 
 	if (req->transfer_len <= NVMET_MAX_INLINE_DATA_LEN) {
 		bio = &req->b.inline_bio;
@@ -345,7 +344,7 @@ static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
 	int ret;
 
 	ret = __blkdev_issue_discard(ns->bdev,
-			le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
+			nvmet_lba_to_sect(ns, range->slba),
 			le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
 			GFP_KERNEL, 0, bio);
 	if (ret && ret != -EOPNOTSUPP) {
@@ -414,8 +413,7 @@ static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
 	if (!nvmet_check_transfer_len(req, 0))
 		return;
 
-	sector = le64_to_cpu(write_zeroes->slba) <<
-		(req->ns->blksize_shift - 9);
+	sector = nvmet_lba_to_sect(req->ns, write_zeroes->slba);
 	nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
 		(req->ns->blksize_shift - 9));
 
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 592763732065..8776dd1a0490 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -603,4 +603,14 @@ static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns)
 	return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple);
 }
 
+static inline __le64 nvmet_sect_to_lba(struct nvmet_ns *ns, sector_t sect)
+{
+	return cpu_to_le64(sect >> (ns->blksize_shift - SECTOR_SHIFT));
+}
+
+static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba)
+{
+	return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT);
+}
+
 #endif /* _NVMET_H */
-- 
2.22.1