[PATCH v4 2/5] nvme-core: introduce complete failed request

[Chao Leng]

Work with nvme native multipath, if a path related error occurs when
queue_rq call HBA drive to send request, queue_rq need complete the
request with NVME_SC_HOST_PATH_ERROR, the request will fail over to
retry if needed.
So introduce nvme_complete_failed_req for queue_rq and
nvmf_fail_nonready_command.

Signed-off-by: Chao Leng <lengchao at huawei.com>
---
 drivers/nvme/host/core.c | 8 ++++++++
 drivers/nvme/host/nvme.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8caf9b34734d..9aad4111d9cd 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -356,6 +356,14 @@ void nvme_complete_rq(struct request *req)
 }
 EXPORT_SYMBOL_GPL(nvme_complete_rq);
 
+void nvme_complete_failed_rq(struct request *req, u16 status)
+{
+	nvme_req(req)->status = status;
+	blk_mq_set_request_complete(req);
+	nvme_complete_rq(req);
+}
+EXPORT_SYMBOL_GPL(nvme_complete_failed_rq);
+
 bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 {
 	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 88a6b97247f5..f0f609644309 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -575,6 +575,7 @@ static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
 }
 
 void nvme_complete_rq(struct request *req);
+void nvme_complete_failed_rq(struct request *req, u16 status);
 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		enum nvme_ctrl_state new_state);
-- 
2.16.4