}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
+static void nvme_free_ns_head(struct kref *ref)
+{
+ struct nvme_ns_head *head =
+ container_of(ref, struct nvme_ns_head, ref);
+
+ ida_simple_remove(&head->subsys->ns_ida, head->instance);
+ list_del_init(&head->entry);
+ cleanup_srcu_struct(&head->srcu);
+ kfree(head);
+}
+
+static void nvme_put_ns_head(struct nvme_ns_head *head)
+{
+ kref_put(&head->ref, nvme_free_ns_head);
+}
+
static void nvme_free_ns(struct kref *kref)
{
struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
nvme_nvm_unregister(ns);
put_disk(ns->disk);
- ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
+ nvme_put_ns_head(ns->head);
nvme_put_ctrl(ns->ctrl);
kfree(ns);
}
{
memset(cmnd, 0, sizeof(*cmnd));
cmnd->common.opcode = nvme_cmd_flush;
- cmnd->common.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
}
static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
memset(cmnd, 0, sizeof(*cmnd));
cmnd->dsm.opcode = nvme_cmd_dsm;
- cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->dsm.nr = cpu_to_le32(segments - 1);
cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
memset(cmnd, 0, sizeof(*cmnd));
cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
- cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
memset(&c, 0, sizeof(c));
c.rw.opcode = io.opcode;
c.rw.flags = io.flags;
- c.rw.nsid = cpu_to_le32(ns->ns_id);
+ c.rw.nsid = cpu_to_le32(ns->head->ns_id);
c.rw.slba = cpu_to_le64(io.slba);
c.rw.length = cpu_to_le16(io.nblocks);
c.rw.control = cpu_to_le16(io.control);
switch (cmd) {
case NVME_IOCTL_ID:
force_successful_syscall_return();
- return ns->ns_id;
+ return ns->head->ns_id;
case NVME_IOCTL_ADMIN_CMD:
return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
case NVME_IOCTL_IO_CMD:
}
}
+static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
+{
+ return !uuid_is_null(&ids->uuid) ||
+ memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
+ memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
+}
+
static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
{
return uuid_equal(&a->uuid, &b->uuid) &&
return -ENODEV;
}
- id = nvme_identify_ns(ctrl, ns->ns_id);
+ id = nvme_identify_ns(ctrl, ns->head->ns_id);
if (!id)
return -ENODEV;
goto out;
}
- nvme_report_ns_ids(ctrl, ns->ns_id, id, &ids);
- if (!nvme_ns_ids_equal(&ns->ids, &ids)) {
+ nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
+ if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
dev_err(ctrl->device,
- "identifiers changed for nsid %d\n", ns->ns_id);
+ "identifiers changed for nsid %d\n", ns->head->ns_id);
ret = -ENODEV;
}
memset(&c, 0, sizeof(c));
c.common.opcode = op;
- c.common.nsid = cpu_to_le32(ns->ns_id);
+ c.common.nsid = cpu_to_le32(ns->head->ns_id);
c.common.cdw10[0] = cpu_to_le32(cdw10);
return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
list_del(&subsys->entry);
mutex_unlock(&nvme_subsystems_lock);
+ ida_destroy(&subsys->ns_ida);
device_del(&subsys->dev);
put_device(&subsys->dev);
}
mutex_init(&subsys->lock);
kref_init(&subsys->ref);
INIT_LIST_HEAD(&subsys->ctrls);
+ INIT_LIST_HEAD(&subsys->nsheads);
nvme_init_subnqn(subsys, ctrl, id);
memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
memcpy(subsys->model, id->mn, sizeof(subsys->model));
"failed to register subsystem device.\n");
goto out_unlock;
}
+ ida_init(&subsys->ns_ida);
list_add_tail(&subsys->entry, &nvme_subsystems);
}
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- struct nvme_ns_ids *ids = &ns->ids;
+ struct nvme_ns_ids *ids = &ns->head->ids;
struct nvme_subsystem *subsys = ns->ctrl->subsys;
int serial_len = sizeof(subsys->serial);
int model_len = sizeof(subsys->model);
return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
serial_len, subsys->serial, model_len, subsys->model,
- ns->ns_id);
+ ns->head->ns_id);
}
static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- return sprintf(buf, "%pU\n", ns->ids.nguid);
+ return sprintf(buf, "%pU\n", ns->head->ids.nguid);
}
static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL);
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- struct nvme_ns_ids *ids = &ns->ids;
+ struct nvme_ns_ids *ids = &ns->head->ids;
/* For backward compatibility expose the NGUID to userspace if
* we have no UUID set
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- return sprintf(buf, "%8ph\n", ns->ids.eui64);
+ return sprintf(buf, "%8ph\n", ns->head->ids.eui64);
}
static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- return sprintf(buf, "%d\n", ns->ns_id);
+ return sprintf(buf, "%d\n", ns->head->ns_id);
}
static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
{
struct device *dev = container_of(kobj, struct device, kobj);
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- struct nvme_ns_ids *ids = &ns->ids;
+ struct nvme_ns_ids *ids = &ns->head->ids;
if (a == &dev_attr_uuid.attr) {
if (uuid_is_null(&ids->uuid) ||
NULL,
};
+static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
+ unsigned nsid)
+{
+ struct nvme_ns_head *h;
+
+ lockdep_assert_held(&subsys->lock);
+
+ list_for_each_entry(h, &subsys->nsheads, entry) {
+ if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
+ return h;
+ }
+
+ return NULL;
+}
+
+static int __nvme_check_ids(struct nvme_subsystem *subsys,
+ struct nvme_ns_head *new)
+{
+ struct nvme_ns_head *h;
+
+ lockdep_assert_held(&subsys->lock);
+
+ list_for_each_entry(h, &subsys->nsheads, entry) {
+ if (nvme_ns_ids_valid(&new->ids) &&
+ nvme_ns_ids_equal(&new->ids, &h->ids))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
+ unsigned nsid, struct nvme_id_ns *id)
+{
+ struct nvme_ns_head *head;
+ int ret = -ENOMEM;
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (!head)
+ goto out;
+ ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
+ if (ret < 0)
+ goto out_free_head;
+ head->instance = ret;
+ INIT_LIST_HEAD(&head->list);
+ init_srcu_struct(&head->srcu);
+ head->subsys = ctrl->subsys;
+ head->ns_id = nsid;
+ kref_init(&head->ref);
+
+ nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
+
+ ret = __nvme_check_ids(ctrl->subsys, head);
+ if (ret) {
+ dev_err(ctrl->device,
+ "duplicate IDs for nsid %d\n", nsid);
+ goto out_cleanup_srcu;
+ }
+
+ list_add_tail(&head->entry, &ctrl->subsys->nsheads);
+ return head;
+out_cleanup_srcu:
+ cleanup_srcu_struct(&head->srcu);
+ ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
+out_free_head:
+ kfree(head);
+out:
+ return ERR_PTR(ret);
+}
+
+static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
+ struct nvme_id_ns *id, bool *new)
+{
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ bool is_shared = id->nmic & (1 << 0);
+ struct nvme_ns_head *head = NULL;
+ int ret = 0;
+
+ mutex_lock(&ctrl->subsys->lock);
+ if (is_shared)
+ head = __nvme_find_ns_head(ctrl->subsys, nsid);
+ if (!head) {
+ head = nvme_alloc_ns_head(ctrl, nsid, id);
+ if (IS_ERR(head)) {
+ ret = PTR_ERR(head);
+ goto out_unlock;
+ }
+
+ *new = true;
+ } else {
+ struct nvme_ns_ids ids;
+
+ nvme_report_ns_ids(ctrl, nsid, id, &ids);
+ if (!nvme_ns_ids_equal(&head->ids, &ids)) {
+ dev_err(ctrl->device,
+ "IDs don't match for shared namespace %d\n",
+ nsid);
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ *new = false;
+ }
+
+ list_add_tail(&ns->siblings, &head->list);
+ ns->head = head;
+
+out_unlock:
+ mutex_unlock(&ctrl->subsys->lock);
+ return ret;
+}
+
static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
- return nsa->ns_id - nsb->ns_id;
+ return nsa->head->ns_id - nsb->head->ns_id;
}
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
mutex_lock(&ctrl->namespaces_mutex);
list_for_each_entry(ns, &ctrl->namespaces, list) {
- if (ns->ns_id == nsid) {
+ if (ns->head->ns_id == nsid) {
if (!kref_get_unless_zero(&ns->kref))
continue;
ret = ns;
break;
}
- if (ns->ns_id > nsid)
+ if (ns->head->ns_id > nsid)
break;
}
mutex_unlock(&ctrl->namespaces_mutex);
if (!ctrl->nr_streams)
return 0;
- ret = nvme_get_stream_params(ctrl, &s, ns->ns_id);
+ ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
if (ret)
return ret;
struct nvme_id_ns *id;
char disk_name[DISK_NAME_LEN];
int node = dev_to_node(ctrl->dev);
+ bool new = true;
ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
if (!ns)
return;
- ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
- if (ns->instance < 0)
- goto out_free_ns;
-
ns->queue = blk_mq_init_queue(ctrl->tagset);
if (IS_ERR(ns->queue))
- goto out_release_instance;
+ goto out_free_ns;
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
ns->queue->queuedata = ns;
ns->ctrl = ctrl;
kref_init(&ns->kref);
- ns->ns_id = nsid;
ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
nvme_set_queue_limits(ctrl, ns->queue);
nvme_setup_streams_ns(ctrl, ns);
- sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
-
id = nvme_identify_ns(ctrl, nsid);
if (!id)
goto out_free_queue;
if (id->ncap == 0)
goto out_free_id;
- nvme_report_ns_ids(ctrl, ns->ns_id, id, &ns->ids);
+ if (nvme_init_ns_head(ns, nsid, id, &new))
+ goto out_free_id;
+
+ sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
if (nvme_nvm_register(ns, disk_name, node)) {
dev_warn(ctrl->device, "LightNVM init failure\n");
- goto out_free_id;
+ goto out_unlink_ns;
}
}
disk = alloc_disk_node(0, node);
if (!disk)
- goto out_free_id;
+ goto out_unlink_ns;
disk->fops = &nvme_fops;
disk->private_data = ns;
pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
ns->disk->disk_name);
return;
+ out_unlink_ns:
+ mutex_lock(&ctrl->subsys->lock);
+ list_del_rcu(&ns->siblings);
+ mutex_unlock(&ctrl->subsys->lock);
out_free_id:
kfree(id);
out_free_queue:
blk_cleanup_queue(ns->queue);
- out_release_instance:
- ida_simple_remove(&ctrl->ns_ida, ns->instance);
out_free_ns:
kfree(ns);
}
static void nvme_ns_remove(struct nvme_ns *ns)
{
+ struct nvme_ns_head *head = ns->head;
+
if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
return;
blk_cleanup_queue(ns->queue);
}
+ mutex_lock(&ns->ctrl->subsys->lock);
+ if (head)
+ list_del_rcu(&ns->siblings);
+ mutex_unlock(&ns->ctrl->subsys->lock);
+
mutex_lock(&ns->ctrl->namespaces_mutex);
list_del_init(&ns->list);
mutex_unlock(&ns->ctrl->namespaces_mutex);
+ synchronize_srcu(&head->srcu);
nvme_put_ns(ns);
}
struct nvme_ns *ns, *next;
list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
- if (ns->ns_id > nsid)
+ if (ns->head->ns_id > nsid)
nvme_ns_remove(ns);
}
}
struct nvme_subsystem *subsys = ctrl->subsys;
ida_simple_remove(&nvme_instance_ida, ctrl->instance);
- ida_destroy(&ctrl->ns_ida);
kfree(ctrl->effects);
if (subsys) {
if (ret)
goto out_free_name;
- ida_init(&ctrl->ns_ida);
-
/*
* Initialize latency tolerance controls. The sysfs files won't
* be visible to userspace unless the device actually supports APST.
projects / mirror_ubuntu-bionic-kernel.git / commitdiff