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()
110 	blk_steal_bios(&ns->head->requeue_list, req);  in nvme_failover_req()
111 	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);  in nvme_failover_req()
114 	kblockd_schedule_work(&ns->head->requeue_work);  in nvme_failover_req()
123 		if (!ns->head->disk)  in nvme_kick_requeue_lists()
125 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_kick_requeue_lists()
127 			disk_uevent(ns->head->disk, KOBJ_CHANGE);  in nvme_kick_requeue_lists()
143 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_clear_current_path()  local
147 	if (!head)  in nvme_mpath_clear_current_path()
151 		if (ns == rcu_access_pointer(head->current_path[node])) {  in nvme_mpath_clear_current_path()
152 			rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_clear_current_path()
167 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_mpath_clear_ctrl_paths()
174 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_revalidate_paths()  local
175 	sector_t capacity = get_capacity(head->disk);  in nvme_mpath_revalidate_paths()
179 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_revalidate_paths()
180 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in nvme_mpath_revalidate_paths()
184 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_revalidate_paths()
187 		rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_revalidate_paths()
188 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_revalidate_paths()
207 static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node)  in __nvme_find_path()  argument
212 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in __nvme_find_path()
216 		if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)  in __nvme_find_path()
242 		rcu_assign_pointer(head->current_path[node], found);  in __nvme_find_path()
246 static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head,  in nvme_next_ns()  argument
249 	ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns,  in nvme_next_ns()
253 	return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings);  in nvme_next_ns()
256 static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,  in nvme_round_robin_path()  argument
261 	if (list_is_singular(&head->list)) {  in nvme_round_robin_path()
267 	for (ns = nvme_next_ns(head, old);  in nvme_round_robin_path()
269 	     ns = nvme_next_ns(head, ns)) {  in nvme_round_robin_path()
295 	rcu_assign_pointer(head->current_path[node], found);  in nvme_round_robin_path()
305 inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)  in nvme_find_path()  argument
310 	ns = srcu_dereference(head->current_path[node], &head->srcu);  in nvme_find_path()
312 		return __nvme_find_path(head, node);  in nvme_find_path()
314 	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)  in nvme_find_path()
315 		return nvme_round_robin_path(head, node, ns);  in nvme_find_path()
317 		return __nvme_find_path(head, node);  in nvme_find_path()
321 static bool nvme_available_path(struct nvme_ns_head *head)  in nvme_available_path()  argument
325 	list_for_each_entry_rcu(ns, &head->list, siblings) {  in nvme_available_path()
343 	struct nvme_ns_head *head = bio->bi_bdev->bd_disk->private_data;  in nvme_ns_head_submit_bio()  local
344 	struct device *dev = disk_to_dev(head->disk);  in nvme_ns_head_submit_bio()
355 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_submit_bio()
356 	ns = nvme_find_path(head);  in nvme_ns_head_submit_bio()
360 		trace_block_bio_remap(bio, disk_devt(ns->head->disk),  in nvme_ns_head_submit_bio()
363 	} else if (nvme_available_path(head)) {  in nvme_ns_head_submit_bio()
366 		spin_lock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
367 		bio_list_add(&head->requeue_list, bio);  in nvme_ns_head_submit_bio()
368 		spin_unlock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
375 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_submit_bio()
394 	struct nvme_ns_head *head = disk->private_data;  in nvme_ns_head_report_zones()  local
398 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_report_zones()
399 	ns = nvme_find_path(head);  in nvme_ns_head_report_zones()
402 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_report_zones()
449 static int nvme_add_ns_head_cdev(struct nvme_ns_head *head)  in nvme_add_ns_head_cdev()  argument
453 	head->cdev_device.parent = &head->subsys->dev;  in nvme_add_ns_head_cdev()
454 	ret = dev_set_name(&head->cdev_device, "ng%dn%d",  in nvme_add_ns_head_cdev()
455 			   head->subsys->instance, head->instance);  in nvme_add_ns_head_cdev()
458 	ret = nvme_cdev_add(&head->cdev, &head->cdev_device,  in nvme_add_ns_head_cdev()
465 	struct nvme_ns_head *head =  in nvme_requeue_work()  local
469 	spin_lock_irq(&head->requeue_lock);  in nvme_requeue_work()
470 	next = bio_list_get(&head->requeue_list);  in nvme_requeue_work()
471 	spin_unlock_irq(&head->requeue_lock);  in nvme_requeue_work()
481 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)  in nvme_mpath_alloc_disk()  argument
485 	mutex_init(&head->lock);  in nvme_mpath_alloc_disk()
486 	bio_list_init(&head->requeue_list);  in nvme_mpath_alloc_disk()
487 	spin_lock_init(&head->requeue_lock);  in nvme_mpath_alloc_disk()
488 	INIT_WORK(&head->requeue_work, nvme_requeue_work);  in nvme_mpath_alloc_disk()
496 	    !nvme_is_unique_nsid(ctrl, head) || !multipath)  in nvme_mpath_alloc_disk()
499 	head->disk = blk_alloc_disk(ctrl->numa_node);  in nvme_mpath_alloc_disk()
500 	if (!head->disk)  in nvme_mpath_alloc_disk()
502 	head->disk->fops = &nvme_ns_head_ops;  in nvme_mpath_alloc_disk()
503 	head->disk->private_data = head;  in nvme_mpath_alloc_disk()
504 	sprintf(head->disk->disk_name, "nvme%dn%d",  in nvme_mpath_alloc_disk()
505 			ctrl->subsys->instance, head->instance);  in nvme_mpath_alloc_disk()
507 	blk_queue_flag_set(QUEUE_FLAG_NONROT, head->disk->queue);  in nvme_mpath_alloc_disk()
508 	blk_queue_flag_set(QUEUE_FLAG_NOWAIT, head->disk->queue);  in nvme_mpath_alloc_disk()
517 		blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue);  in nvme_mpath_alloc_disk()
520 	blk_queue_logical_block_size(head->disk->queue, 512);  in nvme_mpath_alloc_disk()
521 	blk_set_stacking_limits(&head->disk->queue->limits);  in nvme_mpath_alloc_disk()
522 	blk_queue_dma_alignment(head->disk->queue, 3);  in nvme_mpath_alloc_disk()
527 	blk_queue_write_cache(head->disk->queue, vwc, vwc);  in nvme_mpath_alloc_disk()
533 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_set_live()  local
536 	if (!head->disk)  in nvme_mpath_set_live()
544 	if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_set_live()
545 		rc = device_add_disk(&head->subsys->dev, head->disk,  in nvme_mpath_set_live()
551 		nvme_add_ns_head_cdev(head);  in nvme_mpath_set_live()
554 	mutex_lock(&head->lock);  in nvme_mpath_set_live()
558 		srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_set_live()
560 			__nvme_find_path(head, node);  in nvme_mpath_set_live()
561 		srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_set_live()
563 	mutex_unlock(&head->lock);  in nvme_mpath_set_live()
565 	synchronize_srcu(&head->srcu);  in nvme_mpath_set_live()
566 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_set_live()
660 		if (ns->head->ns_id < nsid)  in nvme_update_ana_state()
662 		if (ns->head->ns_id == nsid)  in nvme_update_ana_state()
666 		if (ns->head->ns_id > nsid)  in nvme_update_ana_state()
835 	if (blk_queue_stable_writes(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
837 				   ns->head->disk->queue);  in nvme_mpath_add_disk()
839 	if (blk_queue_is_zoned(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
840 		ns->head->disk->nr_zones = ns->disk->nr_zones;  in nvme_mpath_add_disk()
844 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)  in nvme_mpath_shutdown_disk()  argument
846 	if (!head->disk)  in nvme_mpath_shutdown_disk()
848 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_shutdown_disk()
849 	if (test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_shutdown_disk()
850 		nvme_cdev_del(&head->cdev, &head->cdev_device);  in nvme_mpath_shutdown_disk()
851 		del_gendisk(head->disk);  in nvme_mpath_shutdown_disk()
855 void nvme_mpath_remove_disk(struct nvme_ns_head *head)  in nvme_mpath_remove_disk()  argument
857 	if (!head->disk)  in nvme_mpath_remove_disk()
859 	blk_mark_disk_dead(head->disk);  in nvme_mpath_remove_disk()
861 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_remove_disk()
862 	flush_work(&head->requeue_work);  in nvme_mpath_remove_disk()
863 	put_disk(head->disk);  in nvme_mpath_remove_disk()