105 	spin_lock_irqsave(&ns->head->requeue_lock, flags);  in nvme_failover_req()
107 		bio_set_dev(bio, ns->head->disk->part0);  in nvme_failover_req()
121 	blk_steal_bios(&ns->head->requeue_list, req);  in nvme_failover_req()
122 	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);  in nvme_failover_req()
126 	kblockd_schedule_work(&ns->head->requeue_work);  in nvme_failover_req()
132 	struct gendisk *disk = ns->head->disk;  in nvme_mpath_start_request()
134 	if (READ_ONCE(ns->head->subsys->iopolicy) == NVME_IOPOLICY_QD) {  in nvme_mpath_start_request()
157 	bdev_end_io_acct(ns->head->disk->part0, req_op(rq),  in nvme_mpath_end_request()
170 		if (!ns->head->disk)  in nvme_kick_requeue_lists()
172 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_kick_requeue_lists()
174 			disk_uevent(ns->head->disk, KOBJ_CHANGE);  in nvme_kick_requeue_lists()
190 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_clear_current_path()  local
194 	if (!head)  in nvme_mpath_clear_current_path()
198 		if (ns == rcu_access_pointer(head->current_path[node])) {  in nvme_mpath_clear_current_path()
199 			rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_clear_current_path()
216 		kblockd_schedule_work(&ns->head->requeue_work);  in nvme_mpath_clear_ctrl_paths()
223 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_revalidate_paths()  local
224 	sector_t capacity = get_capacity(head->disk);  in nvme_mpath_revalidate_paths()
228 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_revalidate_paths()
229 	list_for_each_entry_srcu(ns, &head->list, siblings,  in nvme_mpath_revalidate_paths()
230 				 srcu_read_lock_held(&head->srcu)) {  in nvme_mpath_revalidate_paths()
234 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_revalidate_paths()
237 		rcu_assign_pointer(head->current_path[node], NULL);  in nvme_mpath_revalidate_paths()
238 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_revalidate_paths()
257 static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node)  in __nvme_find_path()  argument
262 	list_for_each_entry_srcu(ns, &head->list, siblings,  in __nvme_find_path()
263 				 srcu_read_lock_held(&head->srcu)) {  in __nvme_find_path()
268 		    READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)  in __nvme_find_path()
294 		rcu_assign_pointer(head->current_path[node], found);  in __nvme_find_path()
298 static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head,  in nvme_next_ns()  argument
301 	ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns,  in nvme_next_ns()
305 	return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings);  in nvme_next_ns()
308 static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head)  in nvme_round_robin_path()  argument
312 	struct nvme_ns *old = srcu_dereference(head->current_path[node],  in nvme_round_robin_path()
313 					       &head->srcu);  in nvme_round_robin_path()
316 		return __nvme_find_path(head, node);  in nvme_round_robin_path()
318 	if (list_is_singular(&head->list)) {  in nvme_round_robin_path()
324 	for (ns = nvme_next_ns(head, old);  in nvme_round_robin_path()
326 	     ns = nvme_next_ns(head, ns)) {  in nvme_round_robin_path()
352 	rcu_assign_pointer(head->current_path[node], found);  in nvme_round_robin_path()
356 static struct nvme_ns *nvme_queue_depth_path(struct nvme_ns_head *head)  in nvme_queue_depth_path()  argument
362 	list_for_each_entry_srcu(ns, &head->list, siblings,  in nvme_queue_depth_path()
363 				 srcu_read_lock_held(&head->srcu)) {  in nvme_queue_depth_path()
399 static struct nvme_ns *nvme_numa_path(struct nvme_ns_head *head)  in nvme_numa_path()  argument
404 	ns = srcu_dereference(head->current_path[node], &head->srcu);  in nvme_numa_path()
406 		return __nvme_find_path(head, node);  in nvme_numa_path()
408 		return __nvme_find_path(head, node);  in nvme_numa_path()
412 inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)  in nvme_find_path()  argument
414 	switch (READ_ONCE(head->subsys->iopolicy)) {  in nvme_find_path()
416 		return nvme_queue_depth_path(head);  in nvme_find_path()
418 		return nvme_round_robin_path(head);  in nvme_find_path()
420 		return nvme_numa_path(head);  in nvme_find_path()
424 static bool nvme_available_path(struct nvme_ns_head *head)  in nvme_available_path()  argument
428 	if (!test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags))  in nvme_available_path()
431 	list_for_each_entry_srcu(ns, &head->list, siblings,  in nvme_available_path()
432 				 srcu_read_lock_held(&head->srcu)) {  in nvme_available_path()
450 	struct nvme_ns_head *head = bio->bi_bdev->bd_disk->private_data;  in nvme_ns_head_submit_bio()  local
451 	struct device *dev = disk_to_dev(head->disk);  in nvme_ns_head_submit_bio()
464 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_submit_bio()
465 	ns = nvme_find_path(head);  in nvme_ns_head_submit_bio()
469 		trace_block_bio_remap(bio, disk_devt(ns->head->disk),  in nvme_ns_head_submit_bio()
472 	} else if (nvme_available_path(head)) {  in nvme_ns_head_submit_bio()
475 		spin_lock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
476 		bio_list_add(&head->requeue_list, bio);  in nvme_ns_head_submit_bio()
477 		spin_unlock_irq(&head->requeue_lock);  in nvme_ns_head_submit_bio()
484 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_submit_bio()
503 	struct nvme_ns_head *head = disk->private_data;  in nvme_ns_head_report_zones()  local
507 	srcu_idx = srcu_read_lock(&head->srcu);  in nvme_ns_head_report_zones()
508 	ns = nvme_find_path(head);  in nvme_ns_head_report_zones()
511 	srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_ns_head_report_zones()
558 static int nvme_add_ns_head_cdev(struct nvme_ns_head *head)  in nvme_add_ns_head_cdev()  argument
562 	head->cdev_device.parent = &head->subsys->dev;  in nvme_add_ns_head_cdev()
563 	ret = dev_set_name(&head->cdev_device, "ng%dn%d",  in nvme_add_ns_head_cdev()
564 			   head->subsys->instance, head->instance);  in nvme_add_ns_head_cdev()
567 	ret = nvme_cdev_add(&head->cdev, &head->cdev_device,  in nvme_add_ns_head_cdev()
574 	struct nvme_ns_head *head =  in nvme_partition_scan_work()  local
578 					     &head->disk->state)))  in nvme_partition_scan_work()
581 	mutex_lock(&head->disk->open_mutex);  in nvme_partition_scan_work()
582 	bdev_disk_changed(head->disk, false);  in nvme_partition_scan_work()
583 	mutex_unlock(&head->disk->open_mutex);  in nvme_partition_scan_work()
588 	struct nvme_ns_head *head =  in nvme_requeue_work()  local
592 	spin_lock_irq(&head->requeue_lock);  in nvme_requeue_work()
593 	next = bio_list_get(&head->requeue_list);  in nvme_requeue_work()
594 	spin_unlock_irq(&head->requeue_lock);  in nvme_requeue_work()
604 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)  in nvme_mpath_alloc_disk()  argument
608 	mutex_init(&head->lock);  in nvme_mpath_alloc_disk()
609 	bio_list_init(&head->requeue_list);  in nvme_mpath_alloc_disk()
610 	spin_lock_init(&head->requeue_lock);  in nvme_mpath_alloc_disk()
611 	INIT_WORK(&head->requeue_work, nvme_requeue_work);  in nvme_mpath_alloc_disk()
612 	INIT_WORK(&head->partition_scan_work, nvme_partition_scan_work);  in nvme_mpath_alloc_disk()
620 	    !nvme_is_unique_nsid(ctrl, head) || !multipath)  in nvme_mpath_alloc_disk()
623 	head->disk = blk_alloc_disk(ctrl->numa_node);  in nvme_mpath_alloc_disk()
624 	if (!head->disk)  in nvme_mpath_alloc_disk()
626 	head->disk->fops = &nvme_ns_head_ops;  in nvme_mpath_alloc_disk()
627 	head->disk->private_data = head;  in nvme_mpath_alloc_disk()
637 	set_bit(GD_SUPPRESS_PART_SCAN, &head->disk->state);  in nvme_mpath_alloc_disk()
638 	sprintf(head->disk->disk_name, "nvme%dn%d",  in nvme_mpath_alloc_disk()
639 			ctrl->subsys->instance, head->instance);  in nvme_mpath_alloc_disk()
641 	blk_queue_flag_set(QUEUE_FLAG_NONROT, head->disk->queue);  in nvme_mpath_alloc_disk()
642 	blk_queue_flag_set(QUEUE_FLAG_NOWAIT, head->disk->queue);  in nvme_mpath_alloc_disk()
643 	blk_queue_flag_set(QUEUE_FLAG_IO_STAT, head->disk->queue);  in nvme_mpath_alloc_disk()
652 		blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue);  in nvme_mpath_alloc_disk()
655 	blk_queue_logical_block_size(head->disk->queue, 512);  in nvme_mpath_alloc_disk()
656 	blk_set_stacking_limits(&head->disk->queue->limits);  in nvme_mpath_alloc_disk()
657 	blk_queue_dma_alignment(head->disk->queue, 3);  in nvme_mpath_alloc_disk()
662 	blk_queue_write_cache(head->disk->queue, vwc, vwc);  in nvme_mpath_alloc_disk()
668 	struct nvme_ns_head *head = ns->head;  in nvme_mpath_set_live()  local
671 	if (!head->disk)  in nvme_mpath_set_live()
679 	if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_set_live()
680 		rc = device_add_disk(&head->subsys->dev, head->disk,  in nvme_mpath_set_live()
683 			clear_bit(NVME_NSHEAD_DISK_LIVE, &head->flags);  in nvme_mpath_set_live()
686 		nvme_add_ns_head_cdev(head);  in nvme_mpath_set_live()
687 		kblockd_schedule_work(&head->partition_scan_work);  in nvme_mpath_set_live()
690 	mutex_lock(&head->lock);  in nvme_mpath_set_live()
694 		srcu_idx = srcu_read_lock(&head->srcu);  in nvme_mpath_set_live()
696 			__nvme_find_path(head, node);  in nvme_mpath_set_live()
697 		srcu_read_unlock(&head->srcu, srcu_idx);  in nvme_mpath_set_live()
699 	mutex_unlock(&head->lock);  in nvme_mpath_set_live()
701 	synchronize_srcu(&head->srcu);  in nvme_mpath_set_live()
702 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_set_live()
798 		if (ns->head->ns_id < nsid)  in nvme_update_ana_state()
800 		if (ns->head->ns_id == nsid)  in nvme_update_ana_state()
804 		if (ns->head->ns_id > nsid)  in nvme_update_ana_state()
996 	if (blk_queue_stable_writes(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
998 				   ns->head->disk->queue);  in nvme_mpath_add_disk()
1000 	if (blk_queue_is_zoned(ns->queue) && ns->head->disk)  in nvme_mpath_add_disk()
1001 		ns->head->disk->nr_zones = ns->disk->nr_zones;  in nvme_mpath_add_disk()
1005 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)  in nvme_mpath_shutdown_disk()  argument
1007 	if (!head->disk)  in nvme_mpath_shutdown_disk()
1009 	if (test_and_clear_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {  in nvme_mpath_shutdown_disk()
1010 		nvme_cdev_del(&head->cdev, &head->cdev_device);  in nvme_mpath_shutdown_disk()
1015 		synchronize_srcu(&head->srcu);  in nvme_mpath_shutdown_disk()
1016 		kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_shutdown_disk()
1017 		del_gendisk(head->disk);  in nvme_mpath_shutdown_disk()
1023 	synchronize_srcu(&head->srcu);  in nvme_mpath_shutdown_disk()
1024 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_shutdown_disk()
1027 void nvme_mpath_remove_disk(struct nvme_ns_head *head)  in nvme_mpath_remove_disk()  argument
1029 	if (!head->disk)  in nvme_mpath_remove_disk()
1032 	kblockd_schedule_work(&head->requeue_work);  in nvme_mpath_remove_disk()
1033 	flush_work(&head->requeue_work);  in nvme_mpath_remove_disk()
1034 	flush_work(&head->partition_scan_work);  in nvme_mpath_remove_disk()
1035 	put_disk(head->disk);  in nvme_mpath_remove_disk()