102 	spin_lock_irqsave(&ns->head->requeue_lock, flags);  in nvme_failover_req()
104 		bio_set_dev(bio, ns->head->disk->part0);  in nvme_failover_req()
118 	blk_steal_bios(&ns->head->requeue_list, req);  in nvme_failover_req()
119 	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);  in nvme_failover_req()
122 	kblockd_schedule_work(&ns->head->requeue_work);  in nvme_failover_req()
128 	struct gendisk *disk = ns->head->disk;  in nvme_mpath_start_request()
145 	bdev_end_io_acct(ns->head->disk->part0, req_op(rq),  in nvme_mpath_end_request()
156 		if (!ns->head->disk)  in nvme_kick_requeue_lists()
158 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_kick_requeue_lists()
160 			disk_uevent(ns->head->disk, KOBJ_CHANGE);  in nvme_kick_requeue_lists()
176 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_clear_current_path()  local
180 	if (!head)  in nvme_mpath_clear_current_path()
184 		if (ns == rcu_access_pointer(head->current_path[node])) {  in nvme_mpath_clear_current_path()
185 			rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_clear_current_path()
200 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_mpath_clear_ctrl_paths()
207 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_revalidate_paths()  local
208 	sector_t capacity = get_capacity(head->disk);  in nvme_mpath_revalidate_paths()
212 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_revalidate_paths()
213 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in nvme_mpath_revalidate_paths()
217 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_revalidate_paths()
220 		rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_revalidate_paths()
221 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_revalidate_paths()
240 static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node)  in __nvme_find_path()  argument
245 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in __nvme_find_path()
249 		if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)  in __nvme_find_path()
275 		rcu_assign_pointer(head->current_path[node], found);  in __nvme_find_path()
279 static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head,  in nvme_next_ns()  argument
282 	ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns,  in nvme_next_ns()
286 	return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings);  in nvme_next_ns()
289 static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,  in nvme_round_robin_path()  argument
294 	if (list_is_singular(&head->list)) {  in nvme_round_robin_path()
300 	for (ns = nvme_next_ns(head, old);  in nvme_round_robin_path()
302 	     ns = nvme_next_ns(head, ns)) {  in nvme_round_robin_path()
328 	rcu_assign_pointer(head->current_path[node], found);  in nvme_round_robin_path()
338 inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)  in nvme_find_path()  argument
343 	ns = srcu_dereference(head->current_path[node], &head->srcu);  in nvme_find_path()
345 		return __nvme_find_path(head, node);  in nvme_find_path()
347 	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)  in nvme_find_path()
348 		return nvme_round_robin_path(head, node, ns);  in nvme_find_path()
350 		return __nvme_find_path(head, node);  in nvme_find_path()
354 static bool nvme_available_path(struct nvme_ns_head *head)  in nvme_available_path()  argument
358 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in nvme_available_path()
376 	struct nvme_ns_head *head = bio->bi_bdev->bd_disk->private_data;  in nvme_ns_head_submit_bio()  local
377 	struct device *dev = disk_to_dev(head->disk);  in nvme_ns_head_submit_bio()
390 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_submit_bio()
391 	ns = nvme_find_path(head);  in nvme_ns_head_submit_bio()
395 		trace_block_bio_remap(bio, disk_devt(ns->head->disk),  in nvme_ns_head_submit_bio()
398 	} else if (nvme_available_path(head)) {  in nvme_ns_head_submit_bio()
401 		spin_lock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
402 		bio_list_add(&head->requeue_list, bio);  in nvme_ns_head_submit_bio()
403 		spin_unlock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
410 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_submit_bio()
429 	struct nvme_ns_head *head = disk->private_data;  in nvme_ns_head_report_zones()  local
433 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_report_zones()
434 	ns = nvme_find_path(head);  in nvme_ns_head_report_zones()
437 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_report_zones()
484 static int nvme_add_ns_head_cdev(struct nvme_ns_head *head)  in nvme_add_ns_head_cdev()  argument
488 	head->cdev_device.parent = &head->subsys->dev;  in nvme_add_ns_head_cdev()
489 	ret = dev_set_name(&head->cdev_device, "ng%dn%d",  in nvme_add_ns_head_cdev()
490 			   head->subsys->instance, head->instance);  in nvme_add_ns_head_cdev()
493 	ret = nvme_cdev_add(&head->cdev, &head->cdev_device,  in nvme_add_ns_head_cdev()
500 	struct nvme_ns_head *head =  in nvme_requeue_work()  local
504 	spin_lock_irq(&head->requeue_lock);  in nvme_requeue_work()
505 	next = bio_list_get(&head->requeue_list);  in nvme_requeue_work()
506 	spin_unlock_irq(&head->requeue_lock);  in nvme_requeue_work()
516 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)  in nvme_mpath_alloc_disk()  argument
520 	mutex_init(&head->lock);  in nvme_mpath_alloc_disk()
521 	bio_list_init(&head->requeue_list);  in nvme_mpath_alloc_disk()
522 	spin_lock_init(&head->requeue_lock);  in nvme_mpath_alloc_disk()
523 	INIT_WORK(&head->requeue_work, nvme_requeue_work);  in nvme_mpath_alloc_disk()
531 	    !nvme_is_unique_nsid(ctrl, head) || !multipath)  in nvme_mpath_alloc_disk()
534 	head->disk = blk_alloc_disk(ctrl->numa_node);  in nvme_mpath_alloc_disk()
535 	if (!head->disk)  in nvme_mpath_alloc_disk()
537 	head->disk->fops = &nvme_ns_head_ops;  in nvme_mpath_alloc_disk()
538 	head->disk->private_data = head;  in nvme_mpath_alloc_disk()
539 	sprintf(head->disk->disk_name, "nvme%dn%d",  in nvme_mpath_alloc_disk()
540 			ctrl->subsys->instance, head->instance);  in nvme_mpath_alloc_disk()
542 	blk_queue_flag_set(QUEUE_FLAG_NONROT, head->disk->queue);  in nvme_mpath_alloc_disk()
543 	blk_queue_flag_set(QUEUE_FLAG_NOWAIT, head->disk->queue);  in nvme_mpath_alloc_disk()
544 	blk_queue_flag_set(QUEUE_FLAG_IO_STAT, head->disk->queue);  in nvme_mpath_alloc_disk()
553 		blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue);  in nvme_mpath_alloc_disk()
556 	blk_queue_logical_block_size(head->disk->queue, 512);  in nvme_mpath_alloc_disk()
557 	blk_set_stacking_limits(&head->disk->queue->limits);  in nvme_mpath_alloc_disk()
558 	blk_queue_dma_alignment(head->disk->queue, 3);  in nvme_mpath_alloc_disk()
563 	blk_queue_write_cache(head->disk->queue, vwc, vwc);  in nvme_mpath_alloc_disk()
569 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_set_live()  local
572 	if (!head->disk)  in nvme_mpath_set_live()
580 	if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_set_live()
581 		rc = device_add_disk(&head->subsys->dev, head->disk,  in nvme_mpath_set_live()
587 		nvme_add_ns_head_cdev(head);  in nvme_mpath_set_live()
590 	mutex_lock(&head->lock);  in nvme_mpath_set_live()
594 		srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_set_live()
596 			__nvme_find_path(head, node);  in nvme_mpath_set_live()
597 		srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_set_live()
599 	mutex_unlock(&head->lock);  in nvme_mpath_set_live()
601 	synchronize_srcu(&head->srcu);  in nvme_mpath_set_live()
602 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_set_live()
696 		if (ns->head->ns_id < nsid)  in nvme_update_ana_state()
698 		if (ns->head->ns_id == nsid)  in nvme_update_ana_state()
702 		if (ns->head->ns_id > nsid)  in nvme_update_ana_state()
871 	if (blk_queue_stable_writes(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
873 				   ns->head->disk->queue);  in nvme_mpath_add_disk()
875 	if (blk_queue_is_zoned(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
876 		ns->head->disk->nr_zones = ns->disk->nr_zones;  in nvme_mpath_add_disk()
880 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)  in nvme_mpath_shutdown_disk()  argument
882 	if (!head->disk)  in nvme_mpath_shutdown_disk()
884 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_shutdown_disk()
885 	if (test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_shutdown_disk()
886 		nvme_cdev_del(&head->cdev, &head->cdev_device);  in nvme_mpath_shutdown_disk()
887 		del_gendisk(head->disk);  in nvme_mpath_shutdown_disk()
891 void nvme_mpath_remove_disk(struct nvme_ns_head *head)  in nvme_mpath_remove_disk()  argument
893 	if (!head->disk)  in nvme_mpath_remove_disk()
896 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_remove_disk()
897 	flush_work(&head->requeue_work);  in nvme_mpath_remove_disk()
898 	put_disk(head->disk);  in nvme_mpath_remove_disk()