[PATCH 27/30] block: remove req_no_special_merge() from merging code

Jens Axboe
2018-10-31T17:59:19Z

It'll always be false at this point, just remove it.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/blk-merge.c | 25 +++----------------------
1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 7fedc0391610..3561dcce2260 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -595,17 +595,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
return ll_new_hw_segment(q, req, bio);
}

-/*
- * blk-mq uses req->special to carry normal driver per-request payload, it
- * does not indicate a prepared command that we cannot merge with.
- */
-static bool req_no_special_merge(struct request *req)
-{
- struct request_queue *q = req->q;
-
- return !q->mq_ops && req->special;
-}
-
static bool req_attempt_discard_merge(struct request_queue *q, struct request *req,
struct request *next)
{
@@ -631,13 +620,6 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
unsigned int seg_size =
req->biotail->bi_seg_back_size + next->bio->bi_seg_front_size;

- /*
- * First check if the either of the requests are re-queued
- * requests. Can't merge them if they are.
- */
- if (req_no_special_merge(req) || req_no_special_merge(next))
- return 0;
-
if (req_gap_back_merge(req, next->bio))
return 0;

@@ -738,8 +720,7 @@ static struct request *attempt_merge(struct request_queue *q,
return NULL;

if (rq_data_dir(req) != rq_data_dir(next)
- || req->rq_disk != next->rq_disk
- || req_no_special_merge(next))
+ || req->rq_disk != next->rq_disk)
return NULL;

if (req_op(req) == REQ_OP_WRITE_SAME &&
@@ -858,8 +839,8 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
if (bio_data_dir(bio) != rq_data_dir(rq))
return false;

- /* must be same device and not a special request */
- if (rq->rq_disk != bio->bi_disk || req_no_special_merge(rq))
+ /* must be same device */
+ if (rq->rq_disk != bio->bi_disk)
return false;

/* only merge integrity protected bio into ditto rq */
--
2.17.1