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authorChao Leng2021-02-04 08:55:11 +0100
committerChristoph Hellwig2021-02-10 16:38:03 +0100
commitdda3248e7fc306e0ce3612ae96bdd9a36e2ab04f (patch)
treee9a5238e7c3553652340e0b99f0a2dfae48efefd /drivers/nvme
parent83fba8c8114748a18e20391565cfdfdf8466075c (diff)
nvme: introduce a nvme_host_path_error helper
When using nvme native multipathing, if a path related error occurs during ->queue_rq, the request needs to be completed with NVME_SC_HOST_PATH_ERROR so that the request can be failed over. Introduce a helper to complete the command from ->queue_rq in a wait that invokes nvme_complete_rq. Signed-off-by: Chao Leng <lengchao@huawei.com> [hch: renamed, added a return value to clean up the callers a bit] Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c15
-rw-r--r--drivers/nvme/host/nvme.h1
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0befaad788a0..02579f4f776c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -355,6 +355,21 @@ void nvme_complete_rq(struct request *req)
}
EXPORT_SYMBOL_GPL(nvme_complete_rq);
+/*
+ * Called to unwind from ->queue_rq on a failed command submission so that the
+ * multipathing code gets called to potentially failover to another path.
+ * The caller needs to unwind all transport specific resource allocations and
+ * must return propagate the return value.
+ */
+blk_status_t nvme_host_path_error(struct request *req)
+{
+ nvme_req(req)->status = NVME_SC_HOST_PATH_ERROR;
+ blk_mq_set_request_complete(req);
+ nvme_complete_rq(req);
+ return BLK_STS_OK;
+}
+EXPORT_SYMBOL_GPL(nvme_host_path_error);
+
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 a72f07181091..5819f0381041 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);
+blk_status_t nvme_host_path_error(struct request *req);
bool nvme_cancel_request(struct request *req, void *data, bool reserved);
void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);