UBUNTU: Ubuntu-4.13.0-45.50

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

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4603b115e234887860cbb28520c36ba9e5e7efd8..e0523eb8eee1afe93722054bcb8dc8a5af9c1bf9 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1357,6 +1357,22 @@ void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
        blk_mq_hctx_mark_pending(hctx, ctx);
 }
 
+/*
+ * Should only be used carefully, when the caller knows we want to
+ * bypass a potential IO scheduler on the target device.
+ */
+void blk_mq_request_bypass_insert(struct request *rq)
+{
+       struct blk_mq_ctx *ctx = rq->mq_ctx;
+       struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(rq->q, ctx->cpu);
+
+       spin_lock(&hctx->lock);
+       list_add_tail(&rq->queuelist, &hctx->dispatch);
+       spin_unlock(&hctx->lock);
+
+       blk_mq_run_hw_queue(hctx, false);
+}
+
 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
                            struct list_head *list)