blk-mq-sched: add flush insertion into blk_mq_sched_insert_request()

[mirror_ubuntu-bionic-kernel.git] / block / blk-mq-sched.c

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 4139b07ab33bdc0253c46e044d0c68d5366df19d..1112752f888d0ae1fc5ecb1aa255447e16fc26ea 100644 (file)
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -335,6 +335,64 @@ void blk_mq_sched_restart_queues(struct blk_mq_hw_ctx *hctx)
        }
 }
 
+/*
+ * Add flush/fua to the queue. If we fail getting a driver tag, then
+ * punt to the requeue list. Requeue will re-invoke us from a context
+ * that's safe to block from.
+ */
+static void blk_mq_sched_insert_flush(struct blk_mq_hw_ctx *hctx,
+                                     struct request *rq, bool can_block)
+{
+       if (blk_mq_get_driver_tag(rq, &hctx, can_block)) {
+               blk_insert_flush(rq);
+               blk_mq_run_hw_queue(hctx, true);
+       } else
+               blk_mq_add_to_requeue_list(rq, true, true);
+}
+
+void blk_mq_sched_insert_request(struct request *rq, bool at_head,
+                                bool run_queue, bool async, bool can_block)
+{
+       struct request_queue *q = rq->q;
+       struct elevator_queue *e = q->elevator;
+       struct blk_mq_ctx *ctx = rq->mq_ctx;
+       struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu);
+
+       if (rq->tag == -1 && (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA))) {
+               blk_mq_sched_insert_flush(hctx, rq, can_block);
+               return;
+       }
+
+       if (e && e->type->ops.mq.insert_requests) {
+               LIST_HEAD(list);
+
+               list_add(&rq->queuelist, &list);
+               e->type->ops.mq.insert_requests(hctx, &list, at_head);
+       } else {
+               spin_lock(&ctx->lock);
+               __blk_mq_insert_request(hctx, rq, at_head);
+               spin_unlock(&ctx->lock);
+       }
+
+       if (run_queue)
+               blk_mq_run_hw_queue(hctx, async);
+}
+
+void blk_mq_sched_insert_requests(struct request_queue *q,
+                                 struct blk_mq_ctx *ctx,
+                                 struct list_head *list, bool run_queue_async)
+{
+       struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu);
+       struct elevator_queue *e = hctx->queue->elevator;
+
+       if (e && e->type->ops.mq.insert_requests)
+               e->type->ops.mq.insert_requests(hctx, list, false);
+       else
+               blk_mq_insert_requests(hctx, ctx, list);
+
+       blk_mq_run_hw_queue(hctx, run_queue_async);
+}
+
 static void blk_mq_sched_free_tags(struct blk_mq_tag_set *set,
                                   struct blk_mq_hw_ctx *hctx,
                                   unsigned int hctx_idx)