[xenial:linux-azure][PATCH 06/15] blk-mq-sched: remove unused 'can_block' arg from blk_mq_sched_insert_request

[Marcelo Henrique Cerri]

From: Mike Snitzer <snitzer at redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1848739

After commit:

923218f6166a ("blk-mq: don't allocate driver tag upfront for flush rq")

we no longer use the 'can_block' argument in
blk_mq_sched_insert_request(). Kill it.

Signed-off-by: Mike Snitzer <snitzer at redhat.com>

Added actual commit message as to why it's being removed.

Signed-off-by: Jens Axboe <axboe at kernel.dk>
(cherry picked from commit 9e97d2951a7e6ee6e204f87f6bda4ff754a8cede)
[marcelo.cerri at canonical.com: fixed conflict in blk_mq_requeue_work()
 because the commit aef1897cd36d ("blk-mq: insert rq with DONTPREP to
 hctx dispatch list when requeue") was already applied]
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
---
 block/blk-exec.c     |  2 +-
 block/blk-mq-sched.c |  2 +-
 block/blk-mq-sched.h |  2 +-
 block/blk-mq.c       | 16 +++++++---------
 4 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/block/blk-exec.c b/block/blk-exec.c
index 5c0f3dc446dc..f7b292f12449 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -61,7 +61,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
 	 * be reused after dying flag is set
 	 */
 	if (q->mq_ops) {
-		blk_mq_sched_insert_request(rq, at_head, true, false, false);
+		blk_mq_sched_insert_request(rq, at_head, true, false);
 		return;
 	}
 
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index fc64558241c9..f3380331e5f3 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -429,7 +429,7 @@ void blk_mq_sched_restart(struct blk_mq_hw_ctx *const hctx)
 }
 
 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
-				 bool run_queue, bool async, bool can_block)
+				 bool run_queue, bool async)
 {
 	struct request_queue *q = rq->q;
 	struct elevator_queue *e = q->elevator;
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index ba1d1418a96d..1e9c9018ace1 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -18,7 +18,7 @@ bool blk_mq_sched_try_insert_merge(struct request_queue *q, struct request *rq);
 void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx);
 
 void blk_mq_sched_insert_request(struct request *rq, bool at_head,
-				 bool run_queue, bool async, bool can_block);
+				 bool run_queue, bool async);
 void blk_mq_sched_insert_requests(struct request_queue *q,
 				  struct blk_mq_ctx *ctx,
 				  struct list_head *list, bool run_queue_async);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 90050e6ac9bd..9abc5cbb58f1 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -733,13 +733,13 @@ static void blk_mq_requeue_work(struct work_struct *work)
 		if (rq->rq_flags & RQF_DONTPREP)
 			blk_mq_request_bypass_insert(rq, false);
 		else
-			blk_mq_sched_insert_request(rq, true, false, false, true);
+			blk_mq_sched_insert_request(rq, true, false, false);
 	}
 
 	while (!list_empty(&rq_list)) {
 		rq = list_entry(rq_list.next, struct request, queuelist);
 		list_del_init(&rq->queuelist);
-		blk_mq_sched_insert_request(rq, false, false, false, true);
+		blk_mq_sched_insert_request(rq, false, false, false);
 	}
 
 	blk_mq_run_hw_queues(q, false);
@@ -1727,13 +1727,11 @@ static blk_status_t __blk_mq_issue_directly(struct blk_mq_hw_ctx *hctx,
 	return ret;
 }
 
-static void __blk_mq_fallback_to_insert(struct blk_mq_hw_ctx *hctx,
-					struct request *rq,
+static void __blk_mq_fallback_to_insert(struct request *rq,
 					bool run_queue, bool bypass_insert)
 {
 	if (!bypass_insert)
-		blk_mq_sched_insert_request(rq, false, run_queue, false,
-					    hctx->flags & BLK_MQ_F_BLOCKING);
+		blk_mq_sched_insert_request(rq, false, run_queue, false);
 	else
 		blk_mq_request_bypass_insert(rq, run_queue);
 }
@@ -1765,7 +1763,7 @@ static blk_status_t __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
 
 	return __blk_mq_issue_directly(hctx, rq, cookie);
 insert:
-	__blk_mq_fallback_to_insert(hctx, rq, run_queue, bypass_insert);
+	__blk_mq_fallback_to_insert(rq, run_queue, bypass_insert);
 	if (bypass_insert)
 		return BLK_STS_RESOURCE;
 
@@ -1784,7 +1782,7 @@ static void blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
 
 	ret = __blk_mq_try_issue_directly(hctx, rq, cookie, false);
 	if (ret == BLK_STS_RESOURCE)
-		__blk_mq_fallback_to_insert(hctx, rq, true, false);
+		__blk_mq_fallback_to_insert(rq, true, false);
 	else if (ret != BLK_STS_OK)
 		blk_mq_end_request(rq, ret);
 
@@ -1914,7 +1912,7 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
 	} else if (q->elevator) {
 		blk_mq_put_ctx(data.ctx);
 		blk_mq_bio_to_request(rq, bio);
-		blk_mq_sched_insert_request(rq, false, true, true, true);
+		blk_mq_sched_insert_request(rq, false, true, true);
 	} else {
 		blk_mq_put_ctx(data.ctx);
 		blk_mq_bio_to_request(rq, bio);
-- 
2.20.1