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923 lines
24 KiB
923 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2017-2018 Christoph Hellwig. |
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*/ |
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|
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#include <linux/backing-dev.h> |
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#include <linux/moduleparam.h> |
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#include <linux/vmalloc.h> |
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#include <trace/events/block.h> |
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#include "nvme.h" |
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|
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bool multipath = true; |
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module_param(multipath, bool, 0444); |
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MODULE_PARM_DESC(multipath, |
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"turn on native support for multiple controllers per subsystem"); |
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|
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static const char *nvme_iopolicy_names[] = { |
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[NVME_IOPOLICY_NUMA] = "numa", |
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[NVME_IOPOLICY_RR] = "round-robin", |
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}; |
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|
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static int iopolicy = NVME_IOPOLICY_NUMA; |
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|
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static int nvme_set_iopolicy(const char *val, const struct kernel_param *kp) |
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{ |
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if (!val) |
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return -EINVAL; |
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if (!strncmp(val, "numa", 4)) |
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iopolicy = NVME_IOPOLICY_NUMA; |
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else if (!strncmp(val, "round-robin", 11)) |
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iopolicy = NVME_IOPOLICY_RR; |
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else |
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return -EINVAL; |
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|
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return 0; |
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} |
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|
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static int nvme_get_iopolicy(char *buf, const struct kernel_param *kp) |
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{ |
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return sprintf(buf, "%s\n", nvme_iopolicy_names[iopolicy]); |
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} |
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|
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module_param_call(iopolicy, nvme_set_iopolicy, nvme_get_iopolicy, |
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&iopolicy, 0644); |
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MODULE_PARM_DESC(iopolicy, |
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"Default multipath I/O policy; 'numa' (default) or 'round-robin'"); |
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|
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void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys) |
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{ |
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subsys->iopolicy = iopolicy; |
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} |
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|
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void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) |
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{ |
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struct nvme_ns_head *h; |
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|
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lockdep_assert_held(&subsys->lock); |
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list_for_each_entry(h, &subsys->nsheads, entry) |
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if (h->disk) |
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blk_mq_unfreeze_queue(h->disk->queue); |
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} |
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|
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void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys) |
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{ |
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struct nvme_ns_head *h; |
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|
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lockdep_assert_held(&subsys->lock); |
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list_for_each_entry(h, &subsys->nsheads, entry) |
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if (h->disk) |
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blk_mq_freeze_queue_wait(h->disk->queue); |
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} |
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|
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void nvme_mpath_start_freeze(struct nvme_subsystem *subsys) |
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{ |
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struct nvme_ns_head *h; |
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|
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lockdep_assert_held(&subsys->lock); |
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list_for_each_entry(h, &subsys->nsheads, entry) |
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if (h->disk) |
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blk_freeze_queue_start(h->disk->queue); |
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} |
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|
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void nvme_failover_req(struct request *req) |
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{ |
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struct nvme_ns *ns = req->q->queuedata; |
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u16 status = nvme_req(req)->status & 0x7ff; |
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unsigned long flags; |
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struct bio *bio; |
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nvme_mpath_clear_current_path(ns); |
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|
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/* |
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* If we got back an ANA error, we know the controller is alive but not |
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* ready to serve this namespace. Kick of a re-read of the ANA |
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* information page, and just try any other available path for now. |
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*/ |
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if (nvme_is_ana_error(status) && ns->ctrl->ana_log_buf) { |
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set_bit(NVME_NS_ANA_PENDING, &ns->flags); |
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queue_work(nvme_wq, &ns->ctrl->ana_work); |
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} |
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spin_lock_irqsave(&ns->head->requeue_lock, flags); |
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for (bio = req->bio; bio; bio = bio->bi_next) { |
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bio_set_dev(bio, ns->head->disk->part0); |
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if (bio->bi_opf & REQ_POLLED) { |
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bio->bi_opf &= ~REQ_POLLED; |
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bio->bi_cookie = BLK_QC_T_NONE; |
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} |
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} |
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blk_steal_bios(&ns->head->requeue_list, req); |
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spin_unlock_irqrestore(&ns->head->requeue_lock, flags); |
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|
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blk_mq_end_request(req, 0); |
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kblockd_schedule_work(&ns->head->requeue_work); |
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} |
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void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) |
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{ |
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struct nvme_ns *ns; |
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|
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down_read(&ctrl->namespaces_rwsem); |
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list_for_each_entry(ns, &ctrl->namespaces, list) { |
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if (!ns->head->disk) |
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continue; |
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kblockd_schedule_work(&ns->head->requeue_work); |
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if (ctrl->state == NVME_CTRL_LIVE) |
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disk_uevent(ns->head->disk, KOBJ_CHANGE); |
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} |
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up_read(&ctrl->namespaces_rwsem); |
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} |
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|
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static const char *nvme_ana_state_names[] = { |
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[0] = "invalid state", |
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[NVME_ANA_OPTIMIZED] = "optimized", |
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[NVME_ANA_NONOPTIMIZED] = "non-optimized", |
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[NVME_ANA_INACCESSIBLE] = "inaccessible", |
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[NVME_ANA_PERSISTENT_LOSS] = "persistent-loss", |
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[NVME_ANA_CHANGE] = "change", |
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}; |
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|
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bool nvme_mpath_clear_current_path(struct nvme_ns *ns) |
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{ |
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struct nvme_ns_head *head = ns->head; |
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bool changed = false; |
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int node; |
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|
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if (!head) |
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goto out; |
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|
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for_each_node(node) { |
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if (ns == rcu_access_pointer(head->current_path[node])) { |
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rcu_assign_pointer(head->current_path[node], NULL); |
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changed = true; |
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} |
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} |
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out: |
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return changed; |
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} |
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|
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void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl) |
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{ |
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struct nvme_ns *ns; |
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|
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down_read(&ctrl->namespaces_rwsem); |
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list_for_each_entry(ns, &ctrl->namespaces, list) { |
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nvme_mpath_clear_current_path(ns); |
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kblockd_schedule_work(&ns->head->requeue_work); |
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} |
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up_read(&ctrl->namespaces_rwsem); |
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} |
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void nvme_mpath_revalidate_paths(struct nvme_ns *ns) |
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{ |
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struct nvme_ns_head *head = ns->head; |
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sector_t capacity = get_capacity(head->disk); |
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int node; |
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list_for_each_entry_rcu(ns, &head->list, siblings) { |
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if (capacity != get_capacity(ns->disk)) |
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clear_bit(NVME_NS_READY, &ns->flags); |
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} |
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for_each_node(node) |
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rcu_assign_pointer(head->current_path[node], NULL); |
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} |
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static bool nvme_path_is_disabled(struct nvme_ns *ns) |
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{ |
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/* |
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* We don't treat NVME_CTRL_DELETING as a disabled path as I/O should |
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* still be able to complete assuming that the controller is connected. |
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* Otherwise it will fail immediately and return to the requeue list. |
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*/ |
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if (ns->ctrl->state != NVME_CTRL_LIVE && |
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ns->ctrl->state != NVME_CTRL_DELETING) |
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return true; |
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if (test_bit(NVME_NS_ANA_PENDING, &ns->flags) || |
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!test_bit(NVME_NS_READY, &ns->flags)) |
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return true; |
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return false; |
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} |
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static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node) |
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{ |
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int found_distance = INT_MAX, fallback_distance = INT_MAX, distance; |
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struct nvme_ns *found = NULL, *fallback = NULL, *ns; |
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list_for_each_entry_rcu(ns, &head->list, siblings) { |
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if (nvme_path_is_disabled(ns)) |
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continue; |
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if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA) |
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distance = node_distance(node, ns->ctrl->numa_node); |
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else |
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distance = LOCAL_DISTANCE; |
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switch (ns->ana_state) { |
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case NVME_ANA_OPTIMIZED: |
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if (distance < found_distance) { |
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found_distance = distance; |
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found = ns; |
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} |
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break; |
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case NVME_ANA_NONOPTIMIZED: |
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if (distance < fallback_distance) { |
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fallback_distance = distance; |
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fallback = ns; |
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} |
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break; |
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default: |
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break; |
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} |
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} |
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if (!found) |
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found = fallback; |
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if (found) |
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rcu_assign_pointer(head->current_path[node], found); |
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return found; |
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} |
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static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head, |
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struct nvme_ns *ns) |
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{ |
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ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns, |
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siblings); |
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if (ns) |
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return ns; |
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return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings); |
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} |
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static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head, |
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int node, struct nvme_ns *old) |
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{ |
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struct nvme_ns *ns, *found = NULL; |
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if (list_is_singular(&head->list)) { |
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if (nvme_path_is_disabled(old)) |
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return NULL; |
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return old; |
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} |
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for (ns = nvme_next_ns(head, old); |
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ns && ns != old; |
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ns = nvme_next_ns(head, ns)) { |
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if (nvme_path_is_disabled(ns)) |
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continue; |
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if (ns->ana_state == NVME_ANA_OPTIMIZED) { |
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found = ns; |
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goto out; |
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} |
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if (ns->ana_state == NVME_ANA_NONOPTIMIZED) |
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found = ns; |
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} |
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/* |
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* The loop above skips the current path for round-robin semantics. |
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* Fall back to the current path if either: |
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* - no other optimized path found and current is optimized, |
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* - no other usable path found and current is usable. |
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*/ |
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if (!nvme_path_is_disabled(old) && |
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(old->ana_state == NVME_ANA_OPTIMIZED || |
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(!found && old->ana_state == NVME_ANA_NONOPTIMIZED))) |
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return old; |
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if (!found) |
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return NULL; |
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out: |
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rcu_assign_pointer(head->current_path[node], found); |
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return found; |
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} |
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static inline bool nvme_path_is_optimized(struct nvme_ns *ns) |
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{ |
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return ns->ctrl->state == NVME_CTRL_LIVE && |
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ns->ana_state == NVME_ANA_OPTIMIZED; |
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} |
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inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) |
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{ |
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int node = numa_node_id(); |
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struct nvme_ns *ns; |
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ns = srcu_dereference(head->current_path[node], &head->srcu); |
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if (unlikely(!ns)) |
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return __nvme_find_path(head, node); |
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if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR) |
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return nvme_round_robin_path(head, node, ns); |
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if (unlikely(!nvme_path_is_optimized(ns))) |
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return __nvme_find_path(head, node); |
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return ns; |
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} |
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static bool nvme_available_path(struct nvme_ns_head *head) |
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{ |
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struct nvme_ns *ns; |
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list_for_each_entry_rcu(ns, &head->list, siblings) { |
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if (test_bit(NVME_CTRL_FAILFAST_EXPIRED, &ns->ctrl->flags)) |
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continue; |
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switch (ns->ctrl->state) { |
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case NVME_CTRL_LIVE: |
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case NVME_CTRL_RESETTING: |
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case NVME_CTRL_CONNECTING: |
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/* fallthru */ |
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return true; |
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default: |
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break; |
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} |
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} |
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return false; |
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} |
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static void nvme_ns_head_submit_bio(struct bio *bio) |
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{ |
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struct nvme_ns_head *head = bio->bi_bdev->bd_disk->private_data; |
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struct device *dev = disk_to_dev(head->disk); |
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struct nvme_ns *ns; |
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int srcu_idx; |
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|
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/* |
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* The namespace might be going away and the bio might be moved to a |
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* different queue via blk_steal_bios(), so we need to use the bio_split |
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* pool from the original queue to allocate the bvecs from. |
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*/ |
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bio = bio_split_to_limits(bio); |
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|
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srcu_idx = srcu_read_lock(&head->srcu); |
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ns = nvme_find_path(head); |
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if (likely(ns)) { |
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bio_set_dev(bio, ns->disk->part0); |
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bio->bi_opf |= REQ_NVME_MPATH; |
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trace_block_bio_remap(bio, disk_devt(ns->head->disk), |
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bio->bi_iter.bi_sector); |
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submit_bio_noacct(bio); |
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} else if (nvme_available_path(head)) { |
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dev_warn_ratelimited(dev, "no usable path - requeuing I/O\n"); |
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|
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spin_lock_irq(&head->requeue_lock); |
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bio_list_add(&head->requeue_list, bio); |
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spin_unlock_irq(&head->requeue_lock); |
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} else { |
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dev_warn_ratelimited(dev, "no available path - failing I/O\n"); |
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|
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bio_io_error(bio); |
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} |
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|
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srcu_read_unlock(&head->srcu, srcu_idx); |
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} |
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|
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static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) |
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{ |
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if (!nvme_tryget_ns_head(bdev->bd_disk->private_data)) |
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return -ENXIO; |
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return 0; |
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} |
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|
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static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode) |
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{ |
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nvme_put_ns_head(disk->private_data); |
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} |
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|
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#ifdef CONFIG_BLK_DEV_ZONED |
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static int nvme_ns_head_report_zones(struct gendisk *disk, sector_t sector, |
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unsigned int nr_zones, report_zones_cb cb, void *data) |
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{ |
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struct nvme_ns_head *head = disk->private_data; |
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struct nvme_ns *ns; |
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int srcu_idx, ret = -EWOULDBLOCK; |
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|
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srcu_idx = srcu_read_lock(&head->srcu); |
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ns = nvme_find_path(head); |
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if (ns) |
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ret = nvme_ns_report_zones(ns, sector, nr_zones, cb, data); |
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srcu_read_unlock(&head->srcu, srcu_idx); |
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return ret; |
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} |
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#else |
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#define nvme_ns_head_report_zones NULL |
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#endif /* CONFIG_BLK_DEV_ZONED */ |
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|
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const struct block_device_operations nvme_ns_head_ops = { |
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.owner = THIS_MODULE, |
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.submit_bio = nvme_ns_head_submit_bio, |
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.open = nvme_ns_head_open, |
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.release = nvme_ns_head_release, |
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.ioctl = nvme_ns_head_ioctl, |
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.compat_ioctl = blkdev_compat_ptr_ioctl, |
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.getgeo = nvme_getgeo, |
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.report_zones = nvme_ns_head_report_zones, |
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.pr_ops = &nvme_pr_ops, |
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}; |
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|
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static inline struct nvme_ns_head *cdev_to_ns_head(struct cdev *cdev) |
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{ |
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return container_of(cdev, struct nvme_ns_head, cdev); |
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} |
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|
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static int nvme_ns_head_chr_open(struct inode *inode, struct file *file) |
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{ |
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if (!nvme_tryget_ns_head(cdev_to_ns_head(inode->i_cdev))) |
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return -ENXIO; |
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return 0; |
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} |
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|
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static int nvme_ns_head_chr_release(struct inode *inode, struct file *file) |
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{ |
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nvme_put_ns_head(cdev_to_ns_head(inode->i_cdev)); |
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return 0; |
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} |
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|
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static const struct file_operations nvme_ns_head_chr_fops = { |
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.owner = THIS_MODULE, |
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.open = nvme_ns_head_chr_open, |
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.release = nvme_ns_head_chr_release, |
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.unlocked_ioctl = nvme_ns_head_chr_ioctl, |
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.compat_ioctl = compat_ptr_ioctl, |
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.uring_cmd = nvme_ns_head_chr_uring_cmd, |
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}; |
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|
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static int nvme_add_ns_head_cdev(struct nvme_ns_head *head) |
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{ |
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int ret; |
|
|
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head->cdev_device.parent = &head->subsys->dev; |
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ret = dev_set_name(&head->cdev_device, "ng%dn%d", |
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head->subsys->instance, head->instance); |
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if (ret) |
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return ret; |
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ret = nvme_cdev_add(&head->cdev, &head->cdev_device, |
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&nvme_ns_head_chr_fops, THIS_MODULE); |
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return ret; |
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} |
|
|
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static void nvme_requeue_work(struct work_struct *work) |
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{ |
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struct nvme_ns_head *head = |
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container_of(work, struct nvme_ns_head, requeue_work); |
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struct bio *bio, *next; |
|
|
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spin_lock_irq(&head->requeue_lock); |
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next = bio_list_get(&head->requeue_list); |
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spin_unlock_irq(&head->requeue_lock); |
|
|
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while ((bio = next) != NULL) { |
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next = bio->bi_next; |
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bio->bi_next = NULL; |
|
|
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submit_bio_noacct(bio); |
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} |
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} |
|
|
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int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) |
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{ |
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bool vwc = false; |
|
|
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mutex_init(&head->lock); |
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bio_list_init(&head->requeue_list); |
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spin_lock_init(&head->requeue_lock); |
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INIT_WORK(&head->requeue_work, nvme_requeue_work); |
|
|
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/* |
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* Add a multipath node if the subsystems supports multiple controllers. |
|
* We also do this for private namespaces as the namespace sharing flag |
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* could change after a rescan. |
|
*/ |
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if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || |
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!nvme_is_unique_nsid(ctrl, head) || !multipath) |
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return 0; |
|
|
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head->disk = blk_alloc_disk(ctrl->numa_node); |
|
if (!head->disk) |
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return -ENOMEM; |
|
head->disk->fops = &nvme_ns_head_ops; |
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head->disk->private_data = head; |
|
sprintf(head->disk->disk_name, "nvme%dn%d", |
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ctrl->subsys->instance, head->instance); |
|
|
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blk_queue_flag_set(QUEUE_FLAG_NONROT, head->disk->queue); |
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blk_queue_flag_set(QUEUE_FLAG_NOWAIT, head->disk->queue); |
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/* |
|
* This assumes all controllers that refer to a namespace either |
|
* support poll queues or not. That is not a strict guarantee, |
|
* but if the assumption is wrong the effect is only suboptimal |
|
* performance but not correctness problem. |
|
*/ |
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if (ctrl->tagset->nr_maps > HCTX_TYPE_POLL && |
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ctrl->tagset->map[HCTX_TYPE_POLL].nr_queues) |
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blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue); |
|
|
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/* set to a default value of 512 until the disk is validated */ |
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blk_queue_logical_block_size(head->disk->queue, 512); |
|
blk_set_stacking_limits(&head->disk->queue->limits); |
|
|
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/* we need to propagate up the VMC settings */ |
|
if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) |
|
vwc = true; |
|
blk_queue_write_cache(head->disk->queue, vwc, vwc); |
|
return 0; |
|
} |
|
|
|
static void nvme_mpath_set_live(struct nvme_ns *ns) |
|
{ |
|
struct nvme_ns_head *head = ns->head; |
|
int rc; |
|
|
|
if (!head->disk) |
|
return; |
|
|
|
/* |
|
* test_and_set_bit() is used because it is protecting against two nvme |
|
* paths simultaneously calling device_add_disk() on the same namespace |
|
* head. |
|
*/ |
|
if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { |
|
rc = device_add_disk(&head->subsys->dev, head->disk, |
|
nvme_ns_id_attr_groups); |
|
if (rc) { |
|
clear_bit(NVME_NSHEAD_DISK_LIVE, &ns->flags); |
|
return; |
|
} |
|
nvme_add_ns_head_cdev(head); |
|
} |
|
|
|
mutex_lock(&head->lock); |
|
if (nvme_path_is_optimized(ns)) { |
|
int node, srcu_idx; |
|
|
|
srcu_idx = srcu_read_lock(&head->srcu); |
|
for_each_node(node) |
|
__nvme_find_path(head, node); |
|
srcu_read_unlock(&head->srcu, srcu_idx); |
|
} |
|
mutex_unlock(&head->lock); |
|
|
|
synchronize_srcu(&head->srcu); |
|
kblockd_schedule_work(&head->requeue_work); |
|
} |
|
|
|
static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data, |
|
int (*cb)(struct nvme_ctrl *ctrl, struct nvme_ana_group_desc *, |
|
void *)) |
|
{ |
|
void *base = ctrl->ana_log_buf; |
|
size_t offset = sizeof(struct nvme_ana_rsp_hdr); |
|
int error, i; |
|
|
|
lockdep_assert_held(&ctrl->ana_lock); |
|
|
|
for (i = 0; i < le16_to_cpu(ctrl->ana_log_buf->ngrps); i++) { |
|
struct nvme_ana_group_desc *desc = base + offset; |
|
u32 nr_nsids; |
|
size_t nsid_buf_size; |
|
|
|
if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc))) |
|
return -EINVAL; |
|
|
|
nr_nsids = le32_to_cpu(desc->nnsids); |
|
nsid_buf_size = flex_array_size(desc, nsids, nr_nsids); |
|
|
|
if (WARN_ON_ONCE(desc->grpid == 0)) |
|
return -EINVAL; |
|
if (WARN_ON_ONCE(le32_to_cpu(desc->grpid) > ctrl->anagrpmax)) |
|
return -EINVAL; |
|
if (WARN_ON_ONCE(desc->state == 0)) |
|
return -EINVAL; |
|
if (WARN_ON_ONCE(desc->state > NVME_ANA_CHANGE)) |
|
return -EINVAL; |
|
|
|
offset += sizeof(*desc); |
|
if (WARN_ON_ONCE(offset > ctrl->ana_log_size - nsid_buf_size)) |
|
return -EINVAL; |
|
|
|
error = cb(ctrl, desc, data); |
|
if (error) |
|
return error; |
|
|
|
offset += nsid_buf_size; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static inline bool nvme_state_is_live(enum nvme_ana_state state) |
|
{ |
|
return state == NVME_ANA_OPTIMIZED || state == NVME_ANA_NONOPTIMIZED; |
|
} |
|
|
|
static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc, |
|
struct nvme_ns *ns) |
|
{ |
|
ns->ana_grpid = le32_to_cpu(desc->grpid); |
|
ns->ana_state = desc->state; |
|
clear_bit(NVME_NS_ANA_PENDING, &ns->flags); |
|
/* |
|
* nvme_mpath_set_live() will trigger I/O to the multipath path device |
|
* and in turn to this path device. However we cannot accept this I/O |
|
* if the controller is not live. This may deadlock if called from |
|
* nvme_mpath_init_identify() and the ctrl will never complete |
|
* initialization, preventing I/O from completing. For this case we |
|
* will reprocess the ANA log page in nvme_mpath_update() once the |
|
* controller is ready. |
|
*/ |
|
if (nvme_state_is_live(ns->ana_state) && |
|
ns->ctrl->state == NVME_CTRL_LIVE) |
|
nvme_mpath_set_live(ns); |
|
} |
|
|
|
static int nvme_update_ana_state(struct nvme_ctrl *ctrl, |
|
struct nvme_ana_group_desc *desc, void *data) |
|
{ |
|
u32 nr_nsids = le32_to_cpu(desc->nnsids), n = 0; |
|
unsigned *nr_change_groups = data; |
|
struct nvme_ns *ns; |
|
|
|
dev_dbg(ctrl->device, "ANA group %d: %s.\n", |
|
le32_to_cpu(desc->grpid), |
|
nvme_ana_state_names[desc->state]); |
|
|
|
if (desc->state == NVME_ANA_CHANGE) |
|
(*nr_change_groups)++; |
|
|
|
if (!nr_nsids) |
|
return 0; |
|
|
|
down_read(&ctrl->namespaces_rwsem); |
|
list_for_each_entry(ns, &ctrl->namespaces, list) { |
|
unsigned nsid; |
|
again: |
|
nsid = le32_to_cpu(desc->nsids[n]); |
|
if (ns->head->ns_id < nsid) |
|
continue; |
|
if (ns->head->ns_id == nsid) |
|
nvme_update_ns_ana_state(desc, ns); |
|
if (++n == nr_nsids) |
|
break; |
|
if (ns->head->ns_id > nsid) |
|
goto again; |
|
} |
|
up_read(&ctrl->namespaces_rwsem); |
|
return 0; |
|
} |
|
|
|
static int nvme_read_ana_log(struct nvme_ctrl *ctrl) |
|
{ |
|
u32 nr_change_groups = 0; |
|
int error; |
|
|
|
mutex_lock(&ctrl->ana_lock); |
|
error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_ANA, 0, NVME_CSI_NVM, |
|
ctrl->ana_log_buf, ctrl->ana_log_size, 0); |
|
if (error) { |
|
dev_warn(ctrl->device, "Failed to get ANA log: %d\n", error); |
|
goto out_unlock; |
|
} |
|
|
|
error = nvme_parse_ana_log(ctrl, &nr_change_groups, |
|
nvme_update_ana_state); |
|
if (error) |
|
goto out_unlock; |
|
|
|
/* |
|
* In theory we should have an ANATT timer per group as they might enter |
|
* the change state at different times. But that is a lot of overhead |
|
* just to protect against a target that keeps entering new changes |
|
* states while never finishing previous ones. But we'll still |
|
* eventually time out once all groups are in change state, so this |
|
* isn't a big deal. |
|
* |
|
* We also double the ANATT value to provide some slack for transports |
|
* or AEN processing overhead. |
|
*/ |
|
if (nr_change_groups) |
|
mod_timer(&ctrl->anatt_timer, ctrl->anatt * HZ * 2 + jiffies); |
|
else |
|
del_timer_sync(&ctrl->anatt_timer); |
|
out_unlock: |
|
mutex_unlock(&ctrl->ana_lock); |
|
return error; |
|
} |
|
|
|
static void nvme_ana_work(struct work_struct *work) |
|
{ |
|
struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, ana_work); |
|
|
|
if (ctrl->state != NVME_CTRL_LIVE) |
|
return; |
|
|
|
nvme_read_ana_log(ctrl); |
|
} |
|
|
|
void nvme_mpath_update(struct nvme_ctrl *ctrl) |
|
{ |
|
u32 nr_change_groups = 0; |
|
|
|
if (!ctrl->ana_log_buf) |
|
return; |
|
|
|
mutex_lock(&ctrl->ana_lock); |
|
nvme_parse_ana_log(ctrl, &nr_change_groups, nvme_update_ana_state); |
|
mutex_unlock(&ctrl->ana_lock); |
|
} |
|
|
|
static void nvme_anatt_timeout(struct timer_list *t) |
|
{ |
|
struct nvme_ctrl *ctrl = from_timer(ctrl, t, anatt_timer); |
|
|
|
dev_info(ctrl->device, "ANATT timeout, resetting controller.\n"); |
|
nvme_reset_ctrl(ctrl); |
|
} |
|
|
|
void nvme_mpath_stop(struct nvme_ctrl *ctrl) |
|
{ |
|
if (!nvme_ctrl_use_ana(ctrl)) |
|
return; |
|
del_timer_sync(&ctrl->anatt_timer); |
|
cancel_work_sync(&ctrl->ana_work); |
|
} |
|
|
|
#define SUBSYS_ATTR_RW(_name, _mode, _show, _store) \ |
|
struct device_attribute subsys_attr_##_name = \ |
|
__ATTR(_name, _mode, _show, _store) |
|
|
|
static ssize_t nvme_subsys_iopolicy_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct nvme_subsystem *subsys = |
|
container_of(dev, struct nvme_subsystem, dev); |
|
|
|
return sysfs_emit(buf, "%s\n", |
|
nvme_iopolicy_names[READ_ONCE(subsys->iopolicy)]); |
|
} |
|
|
|
static ssize_t nvme_subsys_iopolicy_store(struct device *dev, |
|
struct device_attribute *attr, const char *buf, size_t count) |
|
{ |
|
struct nvme_subsystem *subsys = |
|
container_of(dev, struct nvme_subsystem, dev); |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(nvme_iopolicy_names); i++) { |
|
if (sysfs_streq(buf, nvme_iopolicy_names[i])) { |
|
WRITE_ONCE(subsys->iopolicy, i); |
|
return count; |
|
} |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
SUBSYS_ATTR_RW(iopolicy, S_IRUGO | S_IWUSR, |
|
nvme_subsys_iopolicy_show, nvme_subsys_iopolicy_store); |
|
|
|
static ssize_t ana_grpid_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
return sysfs_emit(buf, "%d\n", nvme_get_ns_from_dev(dev)->ana_grpid); |
|
} |
|
DEVICE_ATTR_RO(ana_grpid); |
|
|
|
static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct nvme_ns *ns = nvme_get_ns_from_dev(dev); |
|
|
|
return sysfs_emit(buf, "%s\n", nvme_ana_state_names[ns->ana_state]); |
|
} |
|
DEVICE_ATTR_RO(ana_state); |
|
|
|
static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl, |
|
struct nvme_ana_group_desc *desc, void *data) |
|
{ |
|
struct nvme_ana_group_desc *dst = data; |
|
|
|
if (desc->grpid != dst->grpid) |
|
return 0; |
|
|
|
*dst = *desc; |
|
return -ENXIO; /* just break out of the loop */ |
|
} |
|
|
|
void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid) |
|
{ |
|
if (nvme_ctrl_use_ana(ns->ctrl)) { |
|
struct nvme_ana_group_desc desc = { |
|
.grpid = anagrpid, |
|
.state = 0, |
|
}; |
|
|
|
mutex_lock(&ns->ctrl->ana_lock); |
|
ns->ana_grpid = le32_to_cpu(anagrpid); |
|
nvme_parse_ana_log(ns->ctrl, &desc, nvme_lookup_ana_group_desc); |
|
mutex_unlock(&ns->ctrl->ana_lock); |
|
if (desc.state) { |
|
/* found the group desc: update */ |
|
nvme_update_ns_ana_state(&desc, ns); |
|
} else { |
|
/* group desc not found: trigger a re-read */ |
|
set_bit(NVME_NS_ANA_PENDING, &ns->flags); |
|
queue_work(nvme_wq, &ns->ctrl->ana_work); |
|
} |
|
} else { |
|
ns->ana_state = NVME_ANA_OPTIMIZED; |
|
nvme_mpath_set_live(ns); |
|
} |
|
|
|
if (blk_queue_stable_writes(ns->queue) && ns->head->disk) |
|
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, |
|
ns->head->disk->queue); |
|
#ifdef CONFIG_BLK_DEV_ZONED |
|
if (blk_queue_is_zoned(ns->queue) && ns->head->disk) |
|
ns->head->disk->nr_zones = ns->disk->nr_zones; |
|
#endif |
|
} |
|
|
|
void nvme_mpath_shutdown_disk(struct nvme_ns_head *head) |
|
{ |
|
if (!head->disk) |
|
return; |
|
kblockd_schedule_work(&head->requeue_work); |
|
if (test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { |
|
nvme_cdev_del(&head->cdev, &head->cdev_device); |
|
del_gendisk(head->disk); |
|
} |
|
} |
|
|
|
void nvme_mpath_remove_disk(struct nvme_ns_head *head) |
|
{ |
|
if (!head->disk) |
|
return; |
|
blk_mark_disk_dead(head->disk); |
|
/* make sure all pending bios are cleaned up */ |
|
kblockd_schedule_work(&head->requeue_work); |
|
flush_work(&head->requeue_work); |
|
put_disk(head->disk); |
|
} |
|
|
|
void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl) |
|
{ |
|
mutex_init(&ctrl->ana_lock); |
|
timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); |
|
INIT_WORK(&ctrl->ana_work, nvme_ana_work); |
|
} |
|
|
|
int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) |
|
{ |
|
size_t max_transfer_size = ctrl->max_hw_sectors << SECTOR_SHIFT; |
|
size_t ana_log_size; |
|
int error = 0; |
|
|
|
/* check if multipath is enabled and we have the capability */ |
|
if (!multipath || !ctrl->subsys || |
|
!(ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)) |
|
return 0; |
|
|
|
if (!ctrl->max_namespaces || |
|
ctrl->max_namespaces > le32_to_cpu(id->nn)) { |
|
dev_err(ctrl->device, |
|
"Invalid MNAN value %u\n", ctrl->max_namespaces); |
|
return -EINVAL; |
|
} |
|
|
|
ctrl->anacap = id->anacap; |
|
ctrl->anatt = id->anatt; |
|
ctrl->nanagrpid = le32_to_cpu(id->nanagrpid); |
|
ctrl->anagrpmax = le32_to_cpu(id->anagrpmax); |
|
|
|
ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + |
|
ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc) + |
|
ctrl->max_namespaces * sizeof(__le32); |
|
if (ana_log_size > max_transfer_size) { |
|
dev_err(ctrl->device, |
|
"ANA log page size (%zd) larger than MDTS (%zd).\n", |
|
ana_log_size, max_transfer_size); |
|
dev_err(ctrl->device, "disabling ANA support.\n"); |
|
goto out_uninit; |
|
} |
|
if (ana_log_size > ctrl->ana_log_size) { |
|
nvme_mpath_stop(ctrl); |
|
nvme_mpath_uninit(ctrl); |
|
ctrl->ana_log_buf = kvmalloc(ana_log_size, GFP_KERNEL); |
|
if (!ctrl->ana_log_buf) |
|
return -ENOMEM; |
|
} |
|
ctrl->ana_log_size = ana_log_size; |
|
error = nvme_read_ana_log(ctrl); |
|
if (error) |
|
goto out_uninit; |
|
return 0; |
|
|
|
out_uninit: |
|
nvme_mpath_uninit(ctrl); |
|
return error; |
|
} |
|
|
|
void nvme_mpath_uninit(struct nvme_ctrl *ctrl) |
|
{ |
|
kvfree(ctrl->ana_log_buf); |
|
ctrl->ana_log_buf = NULL; |
|
ctrl->ana_log_size = 0; |
|
}
|
|
|