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nvme-fabrics: introduce init command check for a queue that is not alive

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When the fabrics queue is not alive and fully functional, no commands
should be allowed to pass but connect (which moves the queue to a fully
functional state). Any other command should be failed, with either
temporary status BLK_STS_RESOUCE or permanent status BLK_STS_IOERR.

This is shared across all fabrics, hence move the check to fabrics
library.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg
2017-10-24 15:25:20 +03:00
committed by Christoph Hellwig
parent 1690102de5
commit 48832f8d58
2 changed files with 35 additions and 25 deletions
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30
drivers/nvme/host/fabrics.h
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@@ -156,4 +156,34 @@ void nvmf_free_options(struct nvmf_ctrl_options *opts);
int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size);
bool nvmf_should_reconnect(struct nvme_ctrl *ctrl);
static inline blk_status_t nvmf_check_init_req(struct nvme_ctrl *ctrl,
struct request *rq)
{
struct nvme_command *cmd = nvme_req(rq)->cmd;
/*
* We cannot accept any other command until the connect command has
* completed, so only allow connect to pass.
*/
if (!blk_rq_is_passthrough(rq) ||
cmd->common.opcode != nvme_fabrics_command ||
cmd->fabrics.fctype != nvme_fabrics_type_connect) {
/*
* Reconnecting state means transport disruption, which can take
* a long time and even might fail permanently, fail fast to
* give upper layers a chance to failover.
* Deleting state means that the ctrl will never accept commands
* again, fail it permanently.
*/
if (ctrl->state == NVME_CTRL_RECONNECTING ||
ctrl->state == NVME_CTRL_DELETING) {
nvme_req(rq)->status = NVME_SC_ABORT_REQ;
return BLK_STS_IOERR;
}
return BLK_STS_RESOURCE; /* try again later */
}
return BLK_STS_OK;
}
#endif /* _NVME_FABRICS_H */