[PATCH 5/6] null_blk: forward the sector value from null_handle_memory_backend

[Pankaj Raghav <p.raghav@xxxxxxxxxxx>]

This is a preparation patch to add support for power_of_2 emulation in
the null_blk driver.

Currently, the sector value from null_handle_memory_backend is not
forwarded to the lower layer functions such as null_handle_rq and
null_handle_bio but instead they are fetched again from the request or
the bio respectively. This behaviour will not work when zone size
emulation is enabled.

Instead of fetching the sector value again from the request or bio, pass
down the sector value from null_handle_memory_backend to
null_handle_rq/bio.

Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
---
 drivers/block/null_blk/main.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 05b1120e6623..625a06bfa5ad 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1204,13 +1204,12 @@ static int null_transfer(struct nullb *nullb, struct page *page,
 	return err;
 }
 
-static int null_handle_rq(struct nullb_cmd *cmd)
+static int null_handle_rq(struct nullb_cmd *cmd, sector_t sector)
 {
 	struct request *rq = cmd->rq;
 	struct nullb *nullb = cmd->nq->dev->nullb;
 	int err;
 	unsigned int len;
-	sector_t sector = blk_rq_pos(rq);
 	struct req_iterator iter;
 	struct bio_vec bvec;
 
@@ -1231,13 +1230,12 @@ static int null_handle_rq(struct nullb_cmd *cmd)
 	return 0;
 }
 
-static int null_handle_bio(struct nullb_cmd *cmd)
+static int null_handle_bio(struct nullb_cmd *cmd, sector_t sector)
 {
 	struct bio *bio = cmd->bio;
 	struct nullb *nullb = cmd->nq->dev->nullb;
 	int err;
 	unsigned int len;
-	sector_t sector = bio->bi_iter.bi_sector;
 	struct bio_vec bvec;
 	struct bvec_iter iter;
 
@@ -1320,9 +1318,9 @@ static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd,
 		return null_handle_discard(dev, sector, nr_sectors);
 
 	if (dev->queue_mode == NULL_Q_BIO)
-		err = null_handle_bio(cmd);
+		err = null_handle_bio(cmd, sector);
 	else
-		err = null_handle_rq(cmd);
+		err = null_handle_rq(cmd, sector);
 
 	return errno_to_blk_status(err);
 }
-- 
2.25.1