diff options
Diffstat (limited to 'drivers/nvme/host/nvme.h')
| -rw-r--r-- | drivers/nvme/host/nvme.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 6e5004b00975..dd6ced664b45 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -95,6 +95,11 @@ struct nvme_request { u16 status; }; +/* + * Mark a bio as coming in through the mpath node. + */ +#define REQ_NVME_MPATH REQ_DRV + enum { NVME_REQ_CANCELLED = (1 << 0), }; @@ -235,6 +240,13 @@ struct nvme_ns_ids { * only ever has a single entry for private namespaces. */ struct nvme_ns_head { +#ifdef CONFIG_NVME_MULTIPATH + struct gendisk *disk; + struct nvme_ns __rcu *current_path; + struct bio_list requeue_list; + spinlock_t requeue_lock; + struct work_struct requeue_work; +#endif struct list_head list; struct srcu_struct srcu; struct nvme_subsystem *subsys; @@ -384,6 +396,51 @@ int nvme_reset_ctrl(struct nvme_ctrl *ctrl); int nvme_delete_ctrl(struct nvme_ctrl *ctrl); int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl); +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); +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); +void nvme_mpath_remove_disk(struct nvme_ns_head *head); + +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ + struct nvme_ns_head *head = ns->head; + + if (head && ns == srcu_dereference(head->current_path, &head->srcu)) + rcu_assign_pointer(head->current_path, NULL); +} +struct nvme_ns *nvme_find_path(struct nvme_ns_head *head); +#else +static inline void nvme_failover_req(struct request *req) +{ +} +static inline bool nvme_req_needs_failover(struct request *req) +{ + return false; +} +static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) +{ +} +static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, + struct nvme_ns_head *head) +{ + return 0; +} +static inline void nvme_mpath_add_disk(struct nvme_ns_head *head) +{ +} +static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head) +{ +} +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ +} +#endif /* CONFIG_NVME_MULTIPATH */ + #ifdef CONFIG_NVM int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); void nvme_nvm_unregister(struct nvme_ns *ns); |