diff options
Diffstat (limited to 'drivers/nvme/target/configfs.c')
| -rw-r--r-- | drivers/nvme/target/configfs.c | 1659 |
1 files changed, 1659 insertions, 0 deletions
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c new file mode 100644 index 000000000..9aed5cc71 --- /dev/null +++ b/drivers/nvme/target/configfs.c @@ -0,0 +1,1659 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Configfs interface for the NVMe target. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/ctype.h> +#include <linux/pci.h> +#include <linux/pci-p2pdma.h> + +#include "nvmet.h" + +static const struct config_item_type nvmet_host_type; +static const struct config_item_type nvmet_subsys_type; + +static LIST_HEAD(nvmet_ports_list); +struct list_head *nvmet_ports = &nvmet_ports_list; + +struct nvmet_type_name_map { + u8 type; + const char *name; +}; + +static struct nvmet_type_name_map nvmet_transport[] = { + { NVMF_TRTYPE_RDMA, "rdma" }, + { NVMF_TRTYPE_FC, "fc" }, + { NVMF_TRTYPE_TCP, "tcp" }, + { NVMF_TRTYPE_LOOP, "loop" }, +}; + +static const struct nvmet_type_name_map nvmet_addr_family[] = { + { NVMF_ADDR_FAMILY_PCI, "pcie" }, + { NVMF_ADDR_FAMILY_IP4, "ipv4" }, + { NVMF_ADDR_FAMILY_IP6, "ipv6" }, + { NVMF_ADDR_FAMILY_IB, "ib" }, + { NVMF_ADDR_FAMILY_FC, "fc" }, + { NVMF_ADDR_FAMILY_LOOP, "loop" }, +}; + +static bool nvmet_is_port_enabled(struct nvmet_port *p, const char *caller) +{ + if (p->enabled) + pr_err("Disable port '%u' before changing attribute in %s\n", + le16_to_cpu(p->disc_addr.portid), caller); + return p->enabled; +} + +/* + * nvmet_port Generic ConfigFS definitions. + * Used in any place in the ConfigFS tree that refers to an address. + */ +static ssize_t nvmet_addr_adrfam_show(struct config_item *item, char *page) +{ + u8 adrfam = to_nvmet_port(item)->disc_addr.adrfam; + int i; + + for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) { + if (nvmet_addr_family[i].type == adrfam) + return sprintf(page, "%s\n", nvmet_addr_family[i].name); + } + + return sprintf(page, "\n"); +} + +static ssize_t nvmet_addr_adrfam_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + int i; + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) { + if (sysfs_streq(page, nvmet_addr_family[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for adrfam\n", page); + return -EINVAL; + +found: + port->disc_addr.adrfam = nvmet_addr_family[i].type; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_adrfam); + +static ssize_t nvmet_addr_portid_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%d\n", + le16_to_cpu(port->disc_addr.portid)); +} + +static ssize_t nvmet_addr_portid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + u16 portid = 0; + + if (kstrtou16(page, 0, &portid)) { + pr_err("Invalid value '%s' for portid\n", page); + return -EINVAL; + } + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + port->disc_addr.portid = cpu_to_le16(portid); + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_portid); + +static ssize_t nvmet_addr_traddr_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%s\n", + port->disc_addr.traddr); +} + +static ssize_t nvmet_addr_traddr_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (count > NVMF_TRADDR_SIZE) { + pr_err("Invalid value '%s' for traddr\n", page); + return -EINVAL; + } + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + if (sscanf(page, "%s\n", port->disc_addr.traddr) != 1) + return -EINVAL; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_traddr); + +static const struct nvmet_type_name_map nvmet_addr_treq[] = { + { NVMF_TREQ_NOT_SPECIFIED, "not specified" }, + { NVMF_TREQ_REQUIRED, "required" }, + { NVMF_TREQ_NOT_REQUIRED, "not required" }, +}; + +static ssize_t nvmet_addr_treq_show(struct config_item *item, char *page) +{ + u8 treq = to_nvmet_port(item)->disc_addr.treq & + NVME_TREQ_SECURE_CHANNEL_MASK; + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) { + if (treq == nvmet_addr_treq[i].type) + return sprintf(page, "%s\n", nvmet_addr_treq[i].name); + } + + return sprintf(page, "\n"); +} + +static ssize_t nvmet_addr_treq_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + u8 treq = port->disc_addr.treq & ~NVME_TREQ_SECURE_CHANNEL_MASK; + int i; + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) { + if (sysfs_streq(page, nvmet_addr_treq[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for treq\n", page); + return -EINVAL; + +found: + treq |= nvmet_addr_treq[i].type; + port->disc_addr.treq = treq; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_treq); + +static ssize_t nvmet_addr_trsvcid_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%s\n", + port->disc_addr.trsvcid); +} + +static ssize_t nvmet_addr_trsvcid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (count > NVMF_TRSVCID_SIZE) { + pr_err("Invalid value '%s' for trsvcid\n", page); + return -EINVAL; + } + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + if (sscanf(page, "%s\n", port->disc_addr.trsvcid) != 1) + return -EINVAL; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_trsvcid); + +static ssize_t nvmet_param_inline_data_size_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%d\n", port->inline_data_size); +} + +static ssize_t nvmet_param_inline_data_size_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + int ret; + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + ret = kstrtoint(page, 0, &port->inline_data_size); + if (ret) { + pr_err("Invalid value '%s' for inline_data_size\n", page); + return -EINVAL; + } + return count; +} + +CONFIGFS_ATTR(nvmet_, param_inline_data_size); + +#ifdef CONFIG_BLK_DEV_INTEGRITY +static ssize_t nvmet_param_pi_enable_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%d\n", port->pi_enable); +} + +static ssize_t nvmet_param_pi_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + bool val; + + if (strtobool(page, &val)) + return -EINVAL; + + if (port->enabled) { + pr_err("Disable port before setting pi_enable value.\n"); + return -EACCES; + } + + port->pi_enable = val; + return count; +} + +CONFIGFS_ATTR(nvmet_, param_pi_enable); +#endif + +static ssize_t nvmet_addr_trtype_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) { + if (port->disc_addr.trtype == nvmet_transport[i].type) + return sprintf(page, "%s\n", nvmet_transport[i].name); + } + + return sprintf(page, "\n"); +} + +static void nvmet_port_init_tsas_rdma(struct nvmet_port *port) +{ + port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED; + port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED; + port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM; +} + +static ssize_t nvmet_addr_trtype_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + int i; + + if (nvmet_is_port_enabled(port, __func__)) + return -EACCES; + + for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) { + if (sysfs_streq(page, nvmet_transport[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for trtype\n", page); + return -EINVAL; + +found: + memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE); + port->disc_addr.trtype = nvmet_transport[i].type; + if (port->disc_addr.trtype == NVMF_TRTYPE_RDMA) + nvmet_port_init_tsas_rdma(port); + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_trtype); + +/* + * Namespace structures & file operation functions below + */ +static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page) +{ + return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path); +} + +static ssize_t nvmet_ns_device_path_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + size_t len; + int ret; + + mutex_lock(&subsys->lock); + ret = -EBUSY; + if (ns->enabled) + goto out_unlock; + + ret = -EINVAL; + len = strcspn(page, "\n"); + if (!len) + goto out_unlock; + + kfree(ns->device_path); + ret = -ENOMEM; + ns->device_path = kmemdup_nul(page, len, GFP_KERNEL); + if (!ns->device_path) + goto out_unlock; + + mutex_unlock(&subsys->lock); + return count; + +out_unlock: + mutex_unlock(&subsys->lock); + return ret; +} + +CONFIGFS_ATTR(nvmet_ns_, device_path); + +#ifdef CONFIG_PCI_P2PDMA +static ssize_t nvmet_ns_p2pmem_show(struct config_item *item, char *page) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + + return pci_p2pdma_enable_show(page, ns->p2p_dev, ns->use_p2pmem); +} + +static ssize_t nvmet_ns_p2pmem_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct pci_dev *p2p_dev = NULL; + bool use_p2pmem; + int ret = count; + int error; + + mutex_lock(&ns->subsys->lock); + if (ns->enabled) { + ret = -EBUSY; + goto out_unlock; + } + + error = pci_p2pdma_enable_store(page, &p2p_dev, &use_p2pmem); + if (error) { + ret = error; + goto out_unlock; + } + + ns->use_p2pmem = use_p2pmem; + pci_dev_put(ns->p2p_dev); + ns->p2p_dev = p2p_dev; + +out_unlock: + mutex_unlock(&ns->subsys->lock); + + return ret; +} + +CONFIGFS_ATTR(nvmet_ns_, p2pmem); +#endif /* CONFIG_PCI_P2PDMA */ + +static ssize_t nvmet_ns_device_uuid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->uuid); +} + +static ssize_t nvmet_ns_device_uuid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + int ret = 0; + + mutex_lock(&subsys->lock); + if (ns->enabled) { + ret = -EBUSY; + goto out_unlock; + } + + if (uuid_parse(page, &ns->uuid)) + ret = -EINVAL; + +out_unlock: + mutex_unlock(&subsys->lock); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, device_uuid); + +static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid); +} + +static ssize_t nvmet_ns_device_nguid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + u8 nguid[16]; + const char *p = page; + int i; + int ret = 0; + + mutex_lock(&subsys->lock); + if (ns->enabled) { + ret = -EBUSY; + goto out_unlock; + } + + for (i = 0; i < 16; i++) { + if (p + 2 > page + count) { + ret = -EINVAL; + goto out_unlock; + } + if (!isxdigit(p[0]) || !isxdigit(p[1])) { + ret = -EINVAL; + goto out_unlock; + } + + nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]); + p += 2; + + if (*p == '-' || *p == ':') + p++; + } + + memcpy(&ns->nguid, nguid, sizeof(nguid)); +out_unlock: + mutex_unlock(&subsys->lock); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, device_nguid); + +static ssize_t nvmet_ns_ana_grpid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%u\n", to_nvmet_ns(item)->anagrpid); +} + +static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + u32 oldgrpid, newgrpid; + int ret; + + ret = kstrtou32(page, 0, &newgrpid); + if (ret) + return ret; + + if (newgrpid < 1 || newgrpid > NVMET_MAX_ANAGRPS) + return -EINVAL; + + down_write(&nvmet_ana_sem); + oldgrpid = ns->anagrpid; + nvmet_ana_group_enabled[newgrpid]++; + ns->anagrpid = newgrpid; + nvmet_ana_group_enabled[oldgrpid]--; + nvmet_ana_chgcnt++; + up_write(&nvmet_ana_sem); + + nvmet_send_ana_event(ns->subsys, NULL); + return count; +} + +CONFIGFS_ATTR(nvmet_ns_, ana_grpid); + +static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page) +{ + return sprintf(page, "%d\n", to_nvmet_ns(item)->enabled); +} + +static ssize_t nvmet_ns_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + bool enable; + int ret = 0; + + if (strtobool(page, &enable)) + return -EINVAL; + + if (enable) + ret = nvmet_ns_enable(ns); + else + nvmet_ns_disable(ns); + + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, enable); + +static ssize_t nvmet_ns_buffered_io_show(struct config_item *item, char *page) +{ + return sprintf(page, "%d\n", to_nvmet_ns(item)->buffered_io); +} + +static ssize_t nvmet_ns_buffered_io_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + bool val; + + if (strtobool(page, &val)) + return -EINVAL; + + mutex_lock(&ns->subsys->lock); + if (ns->enabled) { + pr_err("disable ns before setting buffered_io value.\n"); + mutex_unlock(&ns->subsys->lock); + return -EINVAL; + } + + ns->buffered_io = val; + mutex_unlock(&ns->subsys->lock); + return count; +} + +CONFIGFS_ATTR(nvmet_ns_, buffered_io); + +static ssize_t nvmet_ns_revalidate_size_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + bool val; + + if (strtobool(page, &val)) + return -EINVAL; + + if (!val) + return -EINVAL; + + mutex_lock(&ns->subsys->lock); + if (!ns->enabled) { + pr_err("enable ns before revalidate.\n"); + mutex_unlock(&ns->subsys->lock); + return -EINVAL; + } + nvmet_ns_revalidate(ns); + mutex_unlock(&ns->subsys->lock); + return count; +} + +CONFIGFS_ATTR_WO(nvmet_ns_, revalidate_size); + +static struct configfs_attribute *nvmet_ns_attrs[] = { + &nvmet_ns_attr_device_path, + &nvmet_ns_attr_device_nguid, + &nvmet_ns_attr_device_uuid, + &nvmet_ns_attr_ana_grpid, + &nvmet_ns_attr_enable, + &nvmet_ns_attr_buffered_io, + &nvmet_ns_attr_revalidate_size, +#ifdef CONFIG_PCI_P2PDMA + &nvmet_ns_attr_p2pmem, +#endif + NULL, +}; + +static void nvmet_ns_release(struct config_item *item) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + + nvmet_ns_free(ns); +} + +static struct configfs_item_operations nvmet_ns_item_ops = { + .release = nvmet_ns_release, +}; + +static const struct config_item_type nvmet_ns_type = { + .ct_item_ops = &nvmet_ns_item_ops, + .ct_attrs = nvmet_ns_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ns_make(struct config_group *group, + const char *name) +{ + struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item); + struct nvmet_ns *ns; + int ret; + u32 nsid; + + ret = kstrtou32(name, 0, &nsid); + if (ret) + goto out; + + ret = -EINVAL; + if (nsid == 0 || nsid == NVME_NSID_ALL) { + pr_err("invalid nsid %#x", nsid); + goto out; + } + + ret = -ENOMEM; + ns = nvmet_ns_alloc(subsys, nsid); + if (!ns) + goto out; + config_group_init_type_name(&ns->group, name, &nvmet_ns_type); + + pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn); + + return &ns->group; +out: + return ERR_PTR(ret); +} + +static struct configfs_group_operations nvmet_namespaces_group_ops = { + .make_group = nvmet_ns_make, +}; + +static const struct config_item_type nvmet_namespaces_type = { + .ct_group_ops = &nvmet_namespaces_group_ops, + .ct_owner = THIS_MODULE, +}; + +#ifdef CONFIG_NVME_TARGET_PASSTHRU + +static ssize_t nvmet_passthru_device_path_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item->ci_parent); + + return snprintf(page, PAGE_SIZE, "%s\n", subsys->passthru_ctrl_path); +} + +static ssize_t nvmet_passthru_device_path_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item->ci_parent); + size_t len; + int ret; + + mutex_lock(&subsys->lock); + + ret = -EBUSY; + if (subsys->passthru_ctrl) + goto out_unlock; + + ret = -EINVAL; + len = strcspn(page, "\n"); + if (!len) + goto out_unlock; + + kfree(subsys->passthru_ctrl_path); + ret = -ENOMEM; + subsys->passthru_ctrl_path = kstrndup(page, len, GFP_KERNEL); + if (!subsys->passthru_ctrl_path) + goto out_unlock; + + mutex_unlock(&subsys->lock); + + return count; +out_unlock: + mutex_unlock(&subsys->lock); + return ret; +} +CONFIGFS_ATTR(nvmet_passthru_, device_path); + +static ssize_t nvmet_passthru_enable_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item->ci_parent); + + return sprintf(page, "%d\n", subsys->passthru_ctrl ? 1 : 0); +} + +static ssize_t nvmet_passthru_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item->ci_parent); + bool enable; + int ret = 0; + + if (strtobool(page, &enable)) + return -EINVAL; + + if (enable) + ret = nvmet_passthru_ctrl_enable(subsys); + else + nvmet_passthru_ctrl_disable(subsys); + + return ret ? ret : count; +} +CONFIGFS_ATTR(nvmet_passthru_, enable); + +static struct configfs_attribute *nvmet_passthru_attrs[] = { + &nvmet_passthru_attr_device_path, + &nvmet_passthru_attr_enable, + NULL, +}; + +static const struct config_item_type nvmet_passthru_type = { + .ct_attrs = nvmet_passthru_attrs, + .ct_owner = THIS_MODULE, +}; + +static void nvmet_add_passthru_group(struct nvmet_subsys *subsys) +{ + config_group_init_type_name(&subsys->passthru_group, + "passthru", &nvmet_passthru_type); + configfs_add_default_group(&subsys->passthru_group, + &subsys->group); +} + +#else /* CONFIG_NVME_TARGET_PASSTHRU */ + +static void nvmet_add_passthru_group(struct nvmet_subsys *subsys) +{ +} + +#endif /* CONFIG_NVME_TARGET_PASSTHRU */ + +static int nvmet_port_subsys_allow_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_port *port = to_nvmet_port(parent->ci_parent); + struct nvmet_subsys *subsys; + struct nvmet_subsys_link *link, *p; + int ret; + + if (target->ci_type != &nvmet_subsys_type) { + pr_err("can only link subsystems into the subsystems dir.!\n"); + return -EINVAL; + } + subsys = to_subsys(target); + link = kmalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + link->subsys = subsys; + + down_write(&nvmet_config_sem); + ret = -EEXIST; + list_for_each_entry(p, &port->subsystems, entry) { + if (p->subsys == subsys) + goto out_free_link; + } + + if (list_empty(&port->subsystems)) { + ret = nvmet_enable_port(port); + if (ret) + goto out_free_link; + } + + list_add_tail(&link->entry, &port->subsystems); + nvmet_port_disc_changed(port, subsys); + + up_write(&nvmet_config_sem); + return 0; + +out_free_link: + up_write(&nvmet_config_sem); + kfree(link); + return ret; +} + +static void nvmet_port_subsys_drop_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_port *port = to_nvmet_port(parent->ci_parent); + struct nvmet_subsys *subsys = to_subsys(target); + struct nvmet_subsys_link *p; + + down_write(&nvmet_config_sem); + list_for_each_entry(p, &port->subsystems, entry) { + if (p->subsys == subsys) + goto found; + } + up_write(&nvmet_config_sem); + return; + +found: + list_del(&p->entry); + nvmet_port_del_ctrls(port, subsys); + nvmet_port_disc_changed(port, subsys); + + if (list_empty(&port->subsystems)) + nvmet_disable_port(port); + up_write(&nvmet_config_sem); + kfree(p); +} + +static struct configfs_item_operations nvmet_port_subsys_item_ops = { + .allow_link = nvmet_port_subsys_allow_link, + .drop_link = nvmet_port_subsys_drop_link, +}; + +static const struct config_item_type nvmet_port_subsys_type = { + .ct_item_ops = &nvmet_port_subsys_item_ops, + .ct_owner = THIS_MODULE, +}; + +static int nvmet_allowed_hosts_allow_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); + struct nvmet_host *host; + struct nvmet_host_link *link, *p; + int ret; + + if (target->ci_type != &nvmet_host_type) { + pr_err("can only link hosts into the allowed_hosts directory!\n"); + return -EINVAL; + } + + host = to_host(target); + link = kmalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + link->host = host; + + down_write(&nvmet_config_sem); + ret = -EINVAL; + if (subsys->allow_any_host) { + pr_err("can't add hosts when allow_any_host is set!\n"); + goto out_free_link; + } + + ret = -EEXIST; + list_for_each_entry(p, &subsys->hosts, entry) { + if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) + goto out_free_link; + } + list_add_tail(&link->entry, &subsys->hosts); + nvmet_subsys_disc_changed(subsys, host); + + up_write(&nvmet_config_sem); + return 0; +out_free_link: + up_write(&nvmet_config_sem); + kfree(link); + return ret; +} + +static void nvmet_allowed_hosts_drop_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); + struct nvmet_host *host = to_host(target); + struct nvmet_host_link *p; + + down_write(&nvmet_config_sem); + list_for_each_entry(p, &subsys->hosts, entry) { + if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) + goto found; + } + up_write(&nvmet_config_sem); + return; + +found: + list_del(&p->entry); + nvmet_subsys_disc_changed(subsys, host); + + up_write(&nvmet_config_sem); + kfree(p); +} + +static struct configfs_item_operations nvmet_allowed_hosts_item_ops = { + .allow_link = nvmet_allowed_hosts_allow_link, + .drop_link = nvmet_allowed_hosts_drop_link, +}; + +static const struct config_item_type nvmet_allowed_hosts_type = { + .ct_item_ops = &nvmet_allowed_hosts_item_ops, + .ct_owner = THIS_MODULE, +}; + +static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", + to_subsys(item)->allow_any_host); +} + +static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + bool allow_any_host; + int ret = 0; + + if (strtobool(page, &allow_any_host)) + return -EINVAL; + + down_write(&nvmet_config_sem); + if (allow_any_host && !list_empty(&subsys->hosts)) { + pr_err("Can't set allow_any_host when explicit hosts are set!\n"); + ret = -EINVAL; + goto out_unlock; + } + + if (subsys->allow_any_host != allow_any_host) { + subsys->allow_any_host = allow_any_host; + nvmet_subsys_disc_changed(subsys, NULL); + } + +out_unlock: + up_write(&nvmet_config_sem); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host); + +static ssize_t nvmet_subsys_attr_version_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + if (NVME_TERTIARY(subsys->ver)) + return snprintf(page, PAGE_SIZE, "%llu.%llu.%llu\n", + NVME_MAJOR(subsys->ver), + NVME_MINOR(subsys->ver), + NVME_TERTIARY(subsys->ver)); + + return snprintf(page, PAGE_SIZE, "%llu.%llu\n", + NVME_MAJOR(subsys->ver), + NVME_MINOR(subsys->ver)); +} + +static ssize_t nvmet_subsys_attr_version_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + int major, minor, tertiary = 0; + int ret; + + /* passthru subsystems use the underlying controller's version */ + if (nvmet_passthru_ctrl(subsys)) + return -EINVAL; + + ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary); + if (ret != 2 && ret != 3) + return -EINVAL; + + down_write(&nvmet_config_sem); + subsys->ver = NVME_VS(major, minor, tertiary); + up_write(&nvmet_config_sem); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_version); + +static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial); +} + +static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item, + const char *page, size_t count) +{ + u64 serial; + + if (sscanf(page, "%llx\n", &serial) != 1) + return -EINVAL; + + down_write(&nvmet_config_sem); + to_subsys(item)->serial = serial; + up_write(&nvmet_config_sem); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_serial); + +static ssize_t nvmet_subsys_attr_cntlid_min_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_min); +} + +static ssize_t nvmet_subsys_attr_cntlid_min_store(struct config_item *item, + const char *page, size_t cnt) +{ + u16 cntlid_min; + + if (sscanf(page, "%hu\n", &cntlid_min) != 1) + return -EINVAL; + + if (cntlid_min == 0) + return -EINVAL; + + down_write(&nvmet_config_sem); + if (cntlid_min >= to_subsys(item)->cntlid_max) + goto out_unlock; + to_subsys(item)->cntlid_min = cntlid_min; + up_write(&nvmet_config_sem); + return cnt; + +out_unlock: + up_write(&nvmet_config_sem); + return -EINVAL; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_min); + +static ssize_t nvmet_subsys_attr_cntlid_max_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_max); +} + +static ssize_t nvmet_subsys_attr_cntlid_max_store(struct config_item *item, + const char *page, size_t cnt) +{ + u16 cntlid_max; + + if (sscanf(page, "%hu\n", &cntlid_max) != 1) + return -EINVAL; + + if (cntlid_max == 0) + return -EINVAL; + + down_write(&nvmet_config_sem); + if (cntlid_max <= to_subsys(item)->cntlid_min) + goto out_unlock; + to_subsys(item)->cntlid_max = cntlid_max; + up_write(&nvmet_config_sem); + return cnt; + +out_unlock: + up_write(&nvmet_config_sem); + return -EINVAL; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_max); + +static ssize_t nvmet_subsys_attr_model_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item); + struct nvmet_subsys_model *subsys_model; + char *model = NVMET_DEFAULT_CTRL_MODEL; + int ret; + + rcu_read_lock(); + subsys_model = rcu_dereference(subsys->model); + if (subsys_model) + model = subsys_model->number; + ret = snprintf(page, PAGE_SIZE, "%s\n", model); + rcu_read_unlock(); + + return ret; +} + +/* See Section 1.5 of NVMe 1.4 */ +static bool nvmet_is_ascii(const char c) +{ + return c >= 0x20 && c <= 0x7e; +} + +static ssize_t nvmet_subsys_attr_model_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + struct nvmet_subsys_model *new_model; + char *new_model_number; + int pos = 0, len; + + len = strcspn(page, "\n"); + if (!len) + return -EINVAL; + + for (pos = 0; pos < len; pos++) { + if (!nvmet_is_ascii(page[pos])) + return -EINVAL; + } + + new_model_number = kmemdup_nul(page, len, GFP_KERNEL); + if (!new_model_number) + return -ENOMEM; + + new_model = kzalloc(sizeof(*new_model) + len + 1, GFP_KERNEL); + if (!new_model) { + kfree(new_model_number); + return -ENOMEM; + } + memcpy(new_model->number, new_model_number, len); + + down_write(&nvmet_config_sem); + mutex_lock(&subsys->lock); + new_model = rcu_replace_pointer(subsys->model, new_model, + mutex_is_locked(&subsys->lock)); + mutex_unlock(&subsys->lock); + up_write(&nvmet_config_sem); + + kfree_rcu(new_model, rcuhead); + kfree(new_model_number); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_model); + +#ifdef CONFIG_BLK_DEV_INTEGRITY +static ssize_t nvmet_subsys_attr_pi_enable_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", to_subsys(item)->pi_support); +} + +static ssize_t nvmet_subsys_attr_pi_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + bool pi_enable; + + if (strtobool(page, &pi_enable)) + return -EINVAL; + + subsys->pi_support = pi_enable; + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_pi_enable); +#endif + +static struct configfs_attribute *nvmet_subsys_attrs[] = { + &nvmet_subsys_attr_attr_allow_any_host, + &nvmet_subsys_attr_attr_version, + &nvmet_subsys_attr_attr_serial, + &nvmet_subsys_attr_attr_cntlid_min, + &nvmet_subsys_attr_attr_cntlid_max, + &nvmet_subsys_attr_attr_model, +#ifdef CONFIG_BLK_DEV_INTEGRITY + &nvmet_subsys_attr_attr_pi_enable, +#endif + NULL, +}; + +/* + * Subsystem structures & folder operation functions below + */ +static void nvmet_subsys_release(struct config_item *item) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + nvmet_subsys_del_ctrls(subsys); + nvmet_subsys_put(subsys); +} + +static struct configfs_item_operations nvmet_subsys_item_ops = { + .release = nvmet_subsys_release, +}; + +static const struct config_item_type nvmet_subsys_type = { + .ct_item_ops = &nvmet_subsys_item_ops, + .ct_attrs = nvmet_subsys_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_subsys_make(struct config_group *group, + const char *name) +{ + struct nvmet_subsys *subsys; + + if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) { + pr_err("can't create discovery subsystem through configfs\n"); + return ERR_PTR(-EINVAL); + } + + subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME); + if (IS_ERR(subsys)) + return ERR_CAST(subsys); + + config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type); + + config_group_init_type_name(&subsys->namespaces_group, + "namespaces", &nvmet_namespaces_type); + configfs_add_default_group(&subsys->namespaces_group, &subsys->group); + + config_group_init_type_name(&subsys->allowed_hosts_group, + "allowed_hosts", &nvmet_allowed_hosts_type); + configfs_add_default_group(&subsys->allowed_hosts_group, + &subsys->group); + + nvmet_add_passthru_group(subsys); + + return &subsys->group; +} + +static struct configfs_group_operations nvmet_subsystems_group_ops = { + .make_group = nvmet_subsys_make, +}; + +static const struct config_item_type nvmet_subsystems_type = { + .ct_group_ops = &nvmet_subsystems_group_ops, + .ct_owner = THIS_MODULE, +}; + +static ssize_t nvmet_referral_enable_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled); +} + +static ssize_t nvmet_referral_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent); + struct nvmet_port *port = to_nvmet_port(item); + bool enable; + + if (strtobool(page, &enable)) + goto inval; + + if (enable) + nvmet_referral_enable(parent, port); + else + nvmet_referral_disable(parent, port); + + return count; +inval: + pr_err("Invalid value '%s' for enable\n", page); + return -EINVAL; +} + +CONFIGFS_ATTR(nvmet_referral_, enable); + +/* + * Discovery Service subsystem definitions + */ +static struct configfs_attribute *nvmet_referral_attrs[] = { + &nvmet_attr_addr_adrfam, + &nvmet_attr_addr_portid, + &nvmet_attr_addr_treq, + &nvmet_attr_addr_traddr, + &nvmet_attr_addr_trsvcid, + &nvmet_attr_addr_trtype, + &nvmet_referral_attr_enable, + NULL, +}; + +static void nvmet_referral_notify(struct config_group *group, + struct config_item *item) +{ + struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent); + struct nvmet_port *port = to_nvmet_port(item); + + nvmet_referral_disable(parent, port); +} + +static void nvmet_referral_release(struct config_item *item) +{ + struct nvmet_port *port = to_nvmet_port(item); + + kfree(port); +} + +static struct configfs_item_operations nvmet_referral_item_ops = { + .release = nvmet_referral_release, +}; + +static const struct config_item_type nvmet_referral_type = { + .ct_owner = THIS_MODULE, + .ct_attrs = nvmet_referral_attrs, + .ct_item_ops = &nvmet_referral_item_ops, +}; + +static struct config_group *nvmet_referral_make( + struct config_group *group, const char *name) +{ + struct nvmet_port *port; + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&port->entry); + config_group_init_type_name(&port->group, name, &nvmet_referral_type); + + return &port->group; +} + +static struct configfs_group_operations nvmet_referral_group_ops = { + .make_group = nvmet_referral_make, + .disconnect_notify = nvmet_referral_notify, +}; + +static const struct config_item_type nvmet_referrals_type = { + .ct_owner = THIS_MODULE, + .ct_group_ops = &nvmet_referral_group_ops, +}; + +static struct nvmet_type_name_map nvmet_ana_state[] = { + { NVME_ANA_OPTIMIZED, "optimized" }, + { NVME_ANA_NONOPTIMIZED, "non-optimized" }, + { NVME_ANA_INACCESSIBLE, "inaccessible" }, + { NVME_ANA_PERSISTENT_LOSS, "persistent-loss" }, + { NVME_ANA_CHANGE, "change" }, +}; + +static ssize_t nvmet_ana_group_ana_state_show(struct config_item *item, + char *page) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + enum nvme_ana_state state = grp->port->ana_state[grp->grpid]; + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) { + if (state == nvmet_ana_state[i].type) + return sprintf(page, "%s\n", nvmet_ana_state[i].name); + } + + return sprintf(page, "\n"); +} + +static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + enum nvme_ana_state *ana_state = grp->port->ana_state; + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) { + if (sysfs_streq(page, nvmet_ana_state[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for ana_state\n", page); + return -EINVAL; + +found: + down_write(&nvmet_ana_sem); + ana_state[grp->grpid] = (enum nvme_ana_state) nvmet_ana_state[i].type; + nvmet_ana_chgcnt++; + up_write(&nvmet_ana_sem); + nvmet_port_send_ana_event(grp->port); + return count; +} + +CONFIGFS_ATTR(nvmet_ana_group_, ana_state); + +static struct configfs_attribute *nvmet_ana_group_attrs[] = { + &nvmet_ana_group_attr_ana_state, + NULL, +}; + +static void nvmet_ana_group_release(struct config_item *item) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + + if (grp == &grp->port->ana_default_group) + return; + + down_write(&nvmet_ana_sem); + grp->port->ana_state[grp->grpid] = NVME_ANA_INACCESSIBLE; + nvmet_ana_group_enabled[grp->grpid]--; + up_write(&nvmet_ana_sem); + + nvmet_port_send_ana_event(grp->port); + kfree(grp); +} + +static struct configfs_item_operations nvmet_ana_group_item_ops = { + .release = nvmet_ana_group_release, +}; + +static const struct config_item_type nvmet_ana_group_type = { + .ct_item_ops = &nvmet_ana_group_item_ops, + .ct_attrs = nvmet_ana_group_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ana_groups_make_group( + struct config_group *group, const char *name) +{ + struct nvmet_port *port = ana_groups_to_port(&group->cg_item); + struct nvmet_ana_group *grp; + u32 grpid; + int ret; + + ret = kstrtou32(name, 0, &grpid); + if (ret) + goto out; + + ret = -EINVAL; + if (grpid <= 1 || grpid > NVMET_MAX_ANAGRPS) + goto out; + + ret = -ENOMEM; + grp = kzalloc(sizeof(*grp), GFP_KERNEL); + if (!grp) + goto out; + grp->port = port; + grp->grpid = grpid; + + down_write(&nvmet_ana_sem); + nvmet_ana_group_enabled[grpid]++; + up_write(&nvmet_ana_sem); + + nvmet_port_send_ana_event(grp->port); + + config_group_init_type_name(&grp->group, name, &nvmet_ana_group_type); + return &grp->group; +out: + return ERR_PTR(ret); +} + +static struct configfs_group_operations nvmet_ana_groups_group_ops = { + .make_group = nvmet_ana_groups_make_group, +}; + +static const struct config_item_type nvmet_ana_groups_type = { + .ct_group_ops = &nvmet_ana_groups_group_ops, + .ct_owner = THIS_MODULE, +}; + +/* + * Ports definitions. + */ +static void nvmet_port_release(struct config_item *item) +{ + struct nvmet_port *port = to_nvmet_port(item); + + /* Let inflight controllers teardown complete */ + flush_scheduled_work(); + list_del(&port->global_entry); + + kfree(port->ana_state); + kfree(port); +} + +static struct configfs_attribute *nvmet_port_attrs[] = { + &nvmet_attr_addr_adrfam, + &nvmet_attr_addr_treq, + &nvmet_attr_addr_traddr, + &nvmet_attr_addr_trsvcid, + &nvmet_attr_addr_trtype, + &nvmet_attr_param_inline_data_size, +#ifdef CONFIG_BLK_DEV_INTEGRITY + &nvmet_attr_param_pi_enable, +#endif + NULL, +}; + +static struct configfs_item_operations nvmet_port_item_ops = { + .release = nvmet_port_release, +}; + +static const struct config_item_type nvmet_port_type = { + .ct_attrs = nvmet_port_attrs, + .ct_item_ops = &nvmet_port_item_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ports_make(struct config_group *group, + const char *name) +{ + struct nvmet_port *port; + u16 portid; + u32 i; + + if (kstrtou16(name, 0, &portid)) + return ERR_PTR(-EINVAL); + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return ERR_PTR(-ENOMEM); + + port->ana_state = kcalloc(NVMET_MAX_ANAGRPS + 1, + sizeof(*port->ana_state), GFP_KERNEL); + if (!port->ana_state) { + kfree(port); + return ERR_PTR(-ENOMEM); + } + + for (i = 1; i <= NVMET_MAX_ANAGRPS; i++) { + if (i == NVMET_DEFAULT_ANA_GRPID) + port->ana_state[1] = NVME_ANA_OPTIMIZED; + else + port->ana_state[i] = NVME_ANA_INACCESSIBLE; + } + + list_add(&port->global_entry, &nvmet_ports_list); + + INIT_LIST_HEAD(&port->entry); + INIT_LIST_HEAD(&port->subsystems); + INIT_LIST_HEAD(&port->referrals); + port->inline_data_size = -1; /* < 0 == let the transport choose */ + + port->disc_addr.portid = cpu_to_le16(portid); + port->disc_addr.adrfam = NVMF_ADDR_FAMILY_MAX; + port->disc_addr.treq = NVMF_TREQ_DISABLE_SQFLOW; + config_group_init_type_name(&port->group, name, &nvmet_port_type); + + config_group_init_type_name(&port->subsys_group, + "subsystems", &nvmet_port_subsys_type); + configfs_add_default_group(&port->subsys_group, &port->group); + + config_group_init_type_name(&port->referrals_group, + "referrals", &nvmet_referrals_type); + configfs_add_default_group(&port->referrals_group, &port->group); + + config_group_init_type_name(&port->ana_groups_group, + "ana_groups", &nvmet_ana_groups_type); + configfs_add_default_group(&port->ana_groups_group, &port->group); + + port->ana_default_group.port = port; + port->ana_default_group.grpid = NVMET_DEFAULT_ANA_GRPID; + config_group_init_type_name(&port->ana_default_group.group, + __stringify(NVMET_DEFAULT_ANA_GRPID), + &nvmet_ana_group_type); + configfs_add_default_group(&port->ana_default_group.group, + &port->ana_groups_group); + + return &port->group; +} + +static struct configfs_group_operations nvmet_ports_group_ops = { + .make_group = nvmet_ports_make, +}; + +static const struct config_item_type nvmet_ports_type = { + .ct_group_ops = &nvmet_ports_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group nvmet_subsystems_group; +static struct config_group nvmet_ports_group; + +static void nvmet_host_release(struct config_item *item) +{ + struct nvmet_host *host = to_host(item); + + kfree(host); +} + +static struct configfs_item_operations nvmet_host_item_ops = { + .release = nvmet_host_release, +}; + +static const struct config_item_type nvmet_host_type = { + .ct_item_ops = &nvmet_host_item_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_hosts_make_group(struct config_group *group, + const char *name) +{ + struct nvmet_host *host; + + host = kzalloc(sizeof(*host), GFP_KERNEL); + if (!host) + return ERR_PTR(-ENOMEM); + + config_group_init_type_name(&host->group, name, &nvmet_host_type); + + return &host->group; +} + +static struct configfs_group_operations nvmet_hosts_group_ops = { + .make_group = nvmet_hosts_make_group, +}; + +static const struct config_item_type nvmet_hosts_type = { + .ct_group_ops = &nvmet_hosts_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group nvmet_hosts_group; + +static const struct config_item_type nvmet_root_type = { + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem nvmet_configfs_subsystem = { + .su_group = { + .cg_item = { + .ci_namebuf = "nvmet", + .ci_type = &nvmet_root_type, + }, + }, +}; + +int __init nvmet_init_configfs(void) +{ + int ret; + + config_group_init(&nvmet_configfs_subsystem.su_group); + mutex_init(&nvmet_configfs_subsystem.su_mutex); + + config_group_init_type_name(&nvmet_subsystems_group, + "subsystems", &nvmet_subsystems_type); + configfs_add_default_group(&nvmet_subsystems_group, + &nvmet_configfs_subsystem.su_group); + + config_group_init_type_name(&nvmet_ports_group, + "ports", &nvmet_ports_type); + configfs_add_default_group(&nvmet_ports_group, + &nvmet_configfs_subsystem.su_group); + + config_group_init_type_name(&nvmet_hosts_group, + "hosts", &nvmet_hosts_type); + configfs_add_default_group(&nvmet_hosts_group, + &nvmet_configfs_subsystem.su_group); + + ret = configfs_register_subsystem(&nvmet_configfs_subsystem); + if (ret) { + pr_err("configfs_register_subsystem: %d\n", ret); + return ret; + } + + return 0; +} + +void __exit nvmet_exit_configfs(void) +{ + configfs_unregister_subsystem(&nvmet_configfs_subsystem); +} |