X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=blobdiff_plain;f=drivers%2Fnvme%2Fhost%2Fcore.c;h=1c5a032d490d22116433ac8ff59945a7bdf749b3;hp=abdfdcfb66f4a1ffdcf8bf7d88de79d909c75209;hb=d05d7f40791c;hpb=17007f3994cdb4643355c73f54f0adad006cf59e diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index abdfdcfb66f4..1c5a032d490d 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1394,19 +1394,22 @@ static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) return nsa->ns_id - nsb->ns_id; } -static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid) +static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) { - struct nvme_ns *ns; - - lockdep_assert_held(&ctrl->namespaces_mutex); + struct nvme_ns *ns, *ret = NULL; + mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - if (ns->ns_id == nsid) - return ns; + if (ns->ns_id == nsid) { + kref_get(&ns->kref); + ret = ns; + break; + } if (ns->ns_id > nsid) break; } - return NULL; + mutex_unlock(&ctrl->namespaces_mutex); + return ret; } static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) @@ -1415,8 +1418,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) struct gendisk *disk; int node = dev_to_node(ctrl->dev); - lockdep_assert_held(&ctrl->namespaces_mutex); - ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); if (!ns) return; @@ -1457,7 +1458,10 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) if (nvme_revalidate_disk(ns->disk)) goto out_free_disk; - list_add_tail_rcu(&ns->list, &ctrl->namespaces); + mutex_lock(&ctrl->namespaces_mutex); + list_add_tail(&ns->list, &ctrl->namespaces); + mutex_unlock(&ctrl->namespaces_mutex); + kref_get(&ctrl->kref); if (ns->type == NVME_NS_LIGHTNVM) return; @@ -1480,8 +1484,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) static void nvme_ns_remove(struct nvme_ns *ns) { - lockdep_assert_held(&ns->ctrl->namespaces_mutex); - if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) return; @@ -1494,8 +1496,11 @@ static void nvme_ns_remove(struct nvme_ns *ns) blk_mq_abort_requeue_list(ns->queue); blk_cleanup_queue(ns->queue); } + + mutex_lock(&ns->ctrl->namespaces_mutex); list_del_init(&ns->list); - synchronize_rcu(); + mutex_unlock(&ns->ctrl->namespaces_mutex); + nvme_put_ns(ns); } @@ -1503,10 +1508,11 @@ static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns; - ns = nvme_find_ns(ctrl, nsid); + ns = nvme_find_get_ns(ctrl, nsid); if (ns) { if (revalidate_disk(ns->disk)) nvme_ns_remove(ns); + nvme_put_ns(ns); } else nvme_alloc_ns(ctrl, nsid); } @@ -1535,9 +1541,11 @@ static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) nvme_validate_ns(ctrl, nsid); while (++prev < nsid) { - ns = nvme_find_ns(ctrl, prev); - if (ns) + ns = nvme_find_get_ns(ctrl, prev); + if (ns) { nvme_ns_remove(ns); + nvme_put_ns(ns); + } } } nn -= j; @@ -1552,8 +1560,6 @@ static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn) struct nvme_ns *ns, *next; unsigned i; - lockdep_assert_held(&ctrl->namespaces_mutex); - for (i = 1; i <= nn; i++) nvme_validate_ns(ctrl, i); @@ -1576,7 +1582,6 @@ static void nvme_scan_work(struct work_struct *work) if (nvme_identify_ctrl(ctrl, &id)) return; - mutex_lock(&ctrl->namespaces_mutex); nn = le32_to_cpu(id->nn); if (ctrl->vs >= NVME_VS(1, 1) && !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) { @@ -1585,6 +1590,7 @@ static void nvme_scan_work(struct work_struct *work) } nvme_scan_ns_sequential(ctrl, nn); done: + mutex_lock(&ctrl->namespaces_mutex); list_sort(NULL, &ctrl->namespaces, ns_cmp); mutex_unlock(&ctrl->namespaces_mutex); kfree(id); @@ -1604,6 +1610,11 @@ void nvme_queue_scan(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_queue_scan); +/* + * This function iterates the namespace list unlocked to allow recovery from + * controller failure. It is up to the caller to ensure the namespace list is + * not modified by scan work while this function is executing. + */ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) { struct nvme_ns *ns, *next; @@ -1617,10 +1628,8 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) if (ctrl->state == NVME_CTRL_DEAD) nvme_kill_queues(ctrl); - mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) nvme_ns_remove(ns); - mutex_unlock(&ctrl->namespaces_mutex); } EXPORT_SYMBOL_GPL(nvme_remove_namespaces); @@ -1791,11 +1800,8 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; - rcu_read_lock(); - list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { - if (!kref_get_unless_zero(&ns->kref)) - continue; - + mutex_lock(&ctrl->namespaces_mutex); + list_for_each_entry(ns, &ctrl->namespaces, list) { /* * Revalidating a dead namespace sets capacity to 0. This will * end buffered writers dirtying pages that can't be synced. @@ -1806,10 +1812,8 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl) blk_set_queue_dying(ns->queue); blk_mq_abort_requeue_list(ns->queue); blk_mq_start_stopped_hw_queues(ns->queue, true); - - nvme_put_ns(ns); } - rcu_read_unlock(); + mutex_unlock(&ctrl->namespaces_mutex); } EXPORT_SYMBOL_GPL(nvme_kill_queues); @@ -1817,8 +1821,8 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; - rcu_read_lock(); - list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { + mutex_lock(&ctrl->namespaces_mutex); + list_for_each_entry(ns, &ctrl->namespaces, list) { spin_lock_irq(ns->queue->queue_lock); queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); spin_unlock_irq(ns->queue->queue_lock); @@ -1826,7 +1830,7 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl) blk_mq_cancel_requeue_work(ns->queue); blk_mq_stop_hw_queues(ns->queue); } - rcu_read_unlock(); + mutex_unlock(&ctrl->namespaces_mutex); } EXPORT_SYMBOL_GPL(nvme_stop_queues); @@ -1834,13 +1838,13 @@ void nvme_start_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; - rcu_read_lock(); - list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { + mutex_lock(&ctrl->namespaces_mutex); + list_for_each_entry(ns, &ctrl->namespaces, list) { queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); blk_mq_start_stopped_hw_queues(ns->queue, true); blk_mq_kick_requeue_list(ns->queue); } - rcu_read_unlock(); + mutex_unlock(&ctrl->namespaces_mutex); } EXPORT_SYMBOL_GPL(nvme_start_queues);