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-rw-r--r--block/blk-mq-sched.c23
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/mq-deadline.c10
-rw-r--r--include/linux/elevator.h2
4 files changed, 23 insertions, 14 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index fcc0e89..c27613d 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -201,15 +201,22 @@ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)
* leave them there for as long as we can. Mark the hw queue as
* needing a restart in that case.
*/
- if (list_empty(&rq_list)) {
- if (e && e->type->ops.mq.dispatch_requests)
- e->type->ops.mq.dispatch_requests(hctx, &rq_list);
- else
- blk_mq_flush_busy_ctxs(hctx, &rq_list);
- } else
+ if (!list_empty(&rq_list)) {
blk_mq_sched_mark_restart(hctx);
-
- blk_mq_dispatch_rq_list(hctx, &rq_list);
+ blk_mq_dispatch_rq_list(hctx, &rq_list);
+ } else if (!e || !e->type->ops.mq.dispatch_request) {
+ blk_mq_flush_busy_ctxs(hctx, &rq_list);
+ blk_mq_dispatch_rq_list(hctx, &rq_list);
+ } else {
+ do {
+ struct request *rq;
+
+ rq = e->type->ops.mq.dispatch_request(hctx);
+ if (!rq)
+ break;
+ list_add(&rq->queuelist, &rq_list);
+ } while (blk_mq_dispatch_rq_list(hctx, &rq_list));
+ }
}
void blk_mq_sched_move_to_dispatch(struct blk_mq_hw_ctx *hctx,
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 21795c6..301ae29 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -998,7 +998,7 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list)
*/
if (!list_empty(list)) {
spin_lock(&hctx->lock);
- list_splice(list, &hctx->dispatch);
+ list_splice_init(list, &hctx->dispatch);
spin_unlock(&hctx->lock);
/*
diff --git a/block/mq-deadline.c b/block/mq-deadline.c
index a01986d..d93ec71 100644
--- a/block/mq-deadline.c
+++ b/block/mq-deadline.c
@@ -287,14 +287,16 @@ done:
return rq;
}
-static void dd_dispatch_requests(struct blk_mq_hw_ctx *hctx,
- struct list_head *rq_list)
+static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx)
{
struct deadline_data *dd = hctx->queue->elevator->elevator_data;
+ struct request *rq;
spin_lock(&dd->lock);
- blk_mq_sched_move_to_dispatch(hctx, rq_list, __dd_dispatch_request);
+ rq = __dd_dispatch_request(hctx);
spin_unlock(&dd->lock);
+
+ return rq;
}
static void dd_exit_queue(struct elevator_queue *e)
@@ -517,7 +519,7 @@ static struct elv_fs_entry deadline_attrs[] = {
static struct elevator_type mq_deadline = {
.ops.mq = {
.insert_requests = dd_insert_requests,
- .dispatch_requests = dd_dispatch_requests,
+ .dispatch_request = dd_dispatch_request,
.next_request = elv_rb_latter_request,
.former_request = elv_rb_former_request,
.bio_merge = dd_bio_merge,
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index ecb96fd..b5825c4 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -92,7 +92,7 @@ struct elevator_mq_ops {
struct request *(*get_request)(struct request_queue *, unsigned int, struct blk_mq_alloc_data *);
void (*put_request)(struct request *);
void (*insert_requests)(struct blk_mq_hw_ctx *, struct list_head *, bool);
- void (*dispatch_requests)(struct blk_mq_hw_ctx *, struct list_head *);
+ struct request *(*dispatch_request)(struct blk_mq_hw_ctx *);
bool (*has_work)(struct blk_mq_hw_ctx *);
void (*completed_request)(struct blk_mq_hw_ctx *, struct request *);
void (*started_request)(struct request *);