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nvme/multipath: Consult blk_status_t for failover

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This removes nvme multipath's specific status decoding to see if failover
is needed, using the generic blk_status_t that was decoded earlier. This
abstraction from the raw NVMe status means all status decoding exists
in one place.

Acked-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2018-01-09 12:04:15 -07:00 committed by Jens Axboe
parent e96fef2c3f
commit 908e45643d
3 changed files with 16 additions and 42 deletions
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9
drivers/nvme/host/core.c
View file

@ -197,8 +197,10 @@ static inline bool nvme_req_needs_retry(struct request *req)
void nvme_complete_rq(struct request *req)
{
if (unlikely(nvme_req(req)->status && nvme_req_needs_retry(req))) {
if (nvme_req_needs_failover(req)) {
blk_status_t status = nvme_error_status(req);
if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
if (nvme_req_needs_failover(req, status)) {
nvme_failover_req(req);
return;
}
@ -209,8 +211,7 @@ void nvme_complete_rq(struct request *req)
return;
}
}
blk_mq_end_request(req, nvme_error_status(req));
blk_mq_end_request(req, status);
}
EXPORT_SYMBOL_GPL(nvme_complete_rq);

44
drivers/nvme/host/multipath.c
View file

@ -33,46 +33,18 @@ void nvme_failover_req(struct request *req)
kblockd_schedule_work(&ns->head->requeue_work);
}
bool nvme_req_needs_failover(struct request *req)
bool nvme_req_needs_failover(struct request *req, blk_status_t error)
{
if (!(req->cmd_flags & REQ_NVME_MPATH))
return false;
switch (nvme_req(req)->status & 0x7ff) {
/*
* Generic command status:
*/
case NVME_SC_INVALID_OPCODE:
case NVME_SC_INVALID_FIELD:
case NVME_SC_INVALID_NS:
case NVME_SC_LBA_RANGE:
case NVME_SC_CAP_EXCEEDED:
case NVME_SC_RESERVATION_CONFLICT:
return false;
/*
* I/O command set specific error. Unfortunately these values are
* reused for fabrics commands, but those should never get here.
*/
case NVME_SC_BAD_ATTRIBUTES:
case NVME_SC_INVALID_PI:
case NVME_SC_READ_ONLY:
case NVME_SC_ONCS_NOT_SUPPORTED:
WARN_ON_ONCE(nvme_req(req)->cmd->common.opcode ==
nvme_fabrics_command);
return false;
/*
* Media and Data Integrity Errors:
*/
case NVME_SC_WRITE_FAULT:
case NVME_SC_READ_ERROR:
case NVME_SC_GUARD_CHECK:
case NVME_SC_APPTAG_CHECK:
case NVME_SC_REFTAG_CHECK:
case NVME_SC_COMPARE_FAILED:
case NVME_SC_ACCESS_DENIED:
case NVME_SC_UNWRITTEN_BLOCK:
switch (error) {
case BLK_STS_NOTSUPP:
case BLK_STS_NOSPC:
case BLK_STS_TARGET:
case BLK_STS_NEXUS:
case BLK_STS_MEDIUM:
case BLK_STS_PROTECTION:
return false;
}

5
drivers/nvme/host/nvme.h
View file

@ -402,7 +402,7 @@ extern const struct block_device_operations nvme_ns_head_ops;
#ifdef CONFIG_NVME_MULTIPATH
void nvme_failover_req(struct request *req);
bool nvme_req_needs_failover(struct request *req);
bool nvme_req_needs_failover(struct request *req, blk_status_t error);
void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
void nvme_mpath_add_disk(struct nvme_ns_head *head);
@ -422,7 +422,8 @@ struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
static inline void nvme_failover_req(struct request *req)
{
}
static inline bool nvme_req_needs_failover(struct request *req)
static inline bool nvme_req_needs_failover(struct request *req,
blk_status_t error)
{
return false;
}