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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>
This commit is contained in:
Chao Leng 2021-02-04 08:55:11 +01:00 committed by Christoph Hellwig
parent 83fba8c811
commit dda3248e7f
2 changed files with 16 additions and 0 deletions
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15
drivers/nvme/host/core.c
View File

@ -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,

1
drivers/nvme/host/nvme.h
View File

@ -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);