9 files changed, 129 insertions, 138 deletions

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 4a31d4765390..57c099dd9da5 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -51,15 +51,26 @@
 #include "target_core_xcopy.h"
 
 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)		\
-static void target_core_setup_##_name##_cit(struct se_subsystem_api *sa) \
+static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
 {									\
-	struct target_backend_cits *tbc = &sa->tb_cits;			\
-	struct config_item_type *cit = &tbc->tb_##_name##_cit;		\
+	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
 									\
 	cit->ct_item_ops = _item_ops;					\
 	cit->ct_group_ops = _group_ops;					\
 	cit->ct_attrs = _attrs;						\
-	cit->ct_owner = sa->owner;					\
+	cit->ct_owner = tb->ops->owner;					\
+	pr_debug("Setup generic %s\n", __stringify(_name));		\
+}
+
+#define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)			\
+static void target_core_setup_##_name##_cit(struct target_backend *tb)	\
+{									\
+	struct config_item_type *cit = &tb->tb_##_name##_cit;		\
+									\
+	cit->ct_item_ops = _item_ops;					\
+	cit->ct_group_ops = _group_ops;					\
+	cit->ct_attrs = tb->ops->tb_##_name##_attrs;			\
+	cit->ct_owner = tb->ops->owner;					\
 	pr_debug("Setup generic %s\n", __stringify(_name));		\
 }
 
@@ -469,7 +480,7 @@ static struct configfs_item_operations target_core_dev_attrib_ops = {
 	.store_attribute	= target_core_dev_attrib_attr_store,
 };
 
-TB_CIT_SETUP(dev_attrib, &target_core_dev_attrib_ops, NULL, NULL);
+TB_CIT_SETUP_DRV(dev_attrib, &target_core_dev_attrib_ops, NULL);
 
 /* End functions for struct config_item_type tb_dev_attrib_cit */
 
@@ -1174,13 +1185,13 @@ TB_CIT_SETUP(dev_pr, &target_core_dev_pr_ops, NULL, target_core_dev_pr_attrs);
 static ssize_t target_core_show_dev_info(void *p, char *page)
 {
 	struct se_device *dev = p;
-	struct se_subsystem_api *t = dev->transport;
 	int bl = 0;
 	ssize_t read_bytes = 0;
 
 	transport_dump_dev_state(dev, page, &bl);
 	read_bytes += bl;
-	read_bytes += t->show_configfs_dev_params(dev, page+read_bytes);
+	read_bytes += dev->transport->show_configfs_dev_params(dev,
+			page+read_bytes);
 	return read_bytes;
 }
 
@@ -1198,9 +1209,8 @@ static ssize_t target_core_store_dev_control(
 	size_t count)
 {
 	struct se_device *dev = p;
-	struct se_subsystem_api *t = dev->transport;
 
-	return t->set_configfs_dev_params(dev, page, count);
+	return dev->transport->set_configfs_dev_params(dev, page, count);
 }
 
 static struct target_core_configfs_attribute target_core_attr_dev_control = {
@@ -2477,9 +2487,9 @@ static struct config_group *target_core_make_subdev(
 	const char *name)
 {
 	struct t10_alua_tg_pt_gp *tg_pt_gp;
-	struct se_subsystem_api *t;
 	struct config_item *hba_ci = &group->cg_item;
 	struct se_hba *hba = item_to_hba(hba_ci);
+	struct target_backend *tb = hba->backend;
 	struct se_device *dev;
 	struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
 	struct config_group *dev_stat_grp = NULL;
@@ -2488,10 +2498,6 @@ static struct config_group *target_core_make_subdev(
 	ret = mutex_lock_interruptible(&hba->hba_access_mutex);
 	if (ret)
 		return ERR_PTR(ret);
-	/*
-	 * Locate the struct se_subsystem_api from parent's struct se_hba.
-	 */
-	t = hba->transport;
 
 	dev = target_alloc_device(hba, name);
 	if (!dev)
@@ -2504,17 +2510,17 @@ static struct config_group *target_core_make_subdev(
 	if (!dev_cg->default_groups)
 		goto out_free_device;
 
-	config_group_init_type_name(dev_cg, name, &t->tb_cits.tb_dev_cit);
+	config_group_init_type_name(dev_cg, name, &tb->tb_dev_cit);
 	config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
-			&t->tb_cits.tb_dev_attrib_cit);
+			&tb->tb_dev_attrib_cit);
 	config_group_init_type_name(&dev->dev_pr_group, "pr",
-			&t->tb_cits.tb_dev_pr_cit);
+			&tb->tb_dev_pr_cit);
 	config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
-			&t->tb_cits.tb_dev_wwn_cit);
+			&tb->tb_dev_wwn_cit);
 	config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
-			"alua", &t->tb_cits.tb_dev_alua_tg_pt_gps_cit);
+			"alua", &tb->tb_dev_alua_tg_pt_gps_cit);
 	config_group_init_type_name(&dev->dev_stat_grps.stat_group,
-			"statistics", &t->tb_cits.tb_dev_stat_cit);
+			"statistics", &tb->tb_dev_stat_cit);
 
 	dev_cg->default_groups[0] = &dev->dev_attrib.da_group;
 	dev_cg->default_groups[1] = &dev->dev_pr_group;
@@ -2644,7 +2650,7 @@ static ssize_t target_core_hba_show_attr_hba_info(
 	char *page)
 {
 	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
-			hba->hba_id, hba->transport->name,
+			hba->hba_id, hba->backend->ops->name,
 			TARGET_CORE_CONFIGFS_VERSION);
 }
 
@@ -2664,11 +2670,10 @@ static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
 static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
 				const char *page, size_t count)
 {
-	struct se_subsystem_api *transport = hba->transport;
 	unsigned long mode_flag;
 	int ret;
 
-	if (transport->pmode_enable_hba == NULL)
+	if (hba->backend->ops->pmode_enable_hba == NULL)
 		return -EINVAL;
 
 	ret = kstrtoul(page, 0, &mode_flag);
@@ -2682,7 +2687,7 @@ static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
 		return -EINVAL;
 	}
 
-	ret = transport->pmode_enable_hba(hba, mode_flag);
+	ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
 	if (ret < 0)
 		return -EINVAL;
 	if (ret > 0)
@@ -2808,16 +2813,15 @@ static struct config_item_type target_core_cit = {
 
 /* Stop functions for struct config_item_type target_core_hba_cit */
 
-void target_core_setup_sub_cits(struct se_subsystem_api *sa)
+void target_setup_backend_cits(struct target_backend *tb)
 {
-	target_core_setup_dev_cit(sa);
-	target_core_setup_dev_attrib_cit(sa);
-	target_core_setup_dev_pr_cit(sa);
-	target_core_setup_dev_wwn_cit(sa);
-	target_core_setup_dev_alua_tg_pt_gps_cit(sa);
-	target_core_setup_dev_stat_cit(sa);
+	target_core_setup_dev_cit(tb);
+	target_core_setup_dev_attrib_cit(tb);
+	target_core_setup_dev_pr_cit(tb);
+	target_core_setup_dev_wwn_cit(tb);
+	target_core_setup_dev_alua_tg_pt_gps_cit(tb);
+	target_core_setup_dev_stat_cit(tb);
 }
-EXPORT_SYMBOL(target_core_setup_sub_cits);
 
 static int __init target_core_init_configfs(void)
 {
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 47a73609e277..af906f1caaa7 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1367,13 +1367,13 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 	struct se_device *dev;
 	struct se_lun *xcopy_lun;
 
-	dev = hba->transport->alloc_device(hba, name);
+	dev = hba->backend->ops->alloc_device(hba, name);
 	if (!dev)
 		return NULL;
 
 	dev->dev_link_magic = SE_DEV_LINK_MAGIC;
 	dev->se_hba = hba;
-	dev->transport = hba->transport;
+	dev->transport = hba->backend->ops;
 	dev->prot_length = sizeof(struct se_dif_v1_tuple);
 
 	INIT_LIST_HEAD(&dev->dev_list);
@@ -1571,7 +1571,7 @@ int core_dev_setup_virtual_lun0(void)
 		goto out_free_hba;
 	}
 
-	hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
+	hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
 
 	ret = target_configure_device(dev);
 	if (ret)
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index e865885352da..7c5b1ef57d34 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -46,10 +46,6 @@ static inline struct fd_dev *FD_DEV(struct se_device *dev)
 	return container_of(dev, struct fd_dev, dev);
 }
 
-/*	fd_attach_hba(): (Part of se_subsystem_api_t template)
- *
- *
- */
 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
 {
 	struct fd_host *fd_host;
@@ -881,7 +877,7 @@ static struct configfs_attribute *fileio_backend_dev_attrs[] = {
 	NULL,
 };
 
-static struct se_subsystem_api fileio_template = {
+static const struct target_backend_ops fileio_ops = {
 	.name			= "fileio",
 	.inquiry_prod		= "FILEIO",
 	.inquiry_rev		= FD_VERSION,
@@ -899,21 +895,17 @@ static struct se_subsystem_api fileio_template = {
 	.init_prot		= fd_init_prot,
 	.format_prot		= fd_format_prot,
 	.free_prot		= fd_free_prot,
+	.tb_dev_attrib_attrs	= fileio_backend_dev_attrs,
 };
 
 static int __init fileio_module_init(void)
 {
-	struct target_backend_cits *tbc = &fileio_template.tb_cits;
-
-	target_core_setup_sub_cits(&fileio_template);
-	tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs;
-
-	return transport_subsystem_register(&fileio_template);
+	return transport_backend_register(&fileio_ops);
 }
 
 static void __exit fileio_module_exit(void)
 {
-	transport_subsystem_release(&fileio_template);
+	target_backend_unregister(&fileio_ops);
 }
 
 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c
index e6e496ff9546..62ea4e8e70a8 100644
--- a/drivers/target/target_core_hba.c
+++ b/drivers/target/target_core_hba.c
@@ -39,63 +39,75 @@
 
 #include "target_core_internal.h"
 
-static LIST_HEAD(subsystem_list);
-static DEFINE_MUTEX(subsystem_mutex);
+static LIST_HEAD(backend_list);
+static DEFINE_MUTEX(backend_mutex);
 
 static u32 hba_id_counter;
 
 static DEFINE_SPINLOCK(hba_lock);
 static LIST_HEAD(hba_list);
 
-int transport_subsystem_register(struct se_subsystem_api *sub_api)
-{
-	struct se_subsystem_api *s;
-
-	INIT_LIST_HEAD(&sub_api->sub_api_list);
 
-	mutex_lock(&subsystem_mutex);
-	list_for_each_entry(s, &subsystem_list, sub_api_list) {
-		if (!strcmp(s->name, sub_api->name)) {
-			pr_err("%p is already registered with"
-				" duplicate name %s, unable to process"
-				" request\n", s, s->name);
-			mutex_unlock(&subsystem_mutex);
+int transport_backend_register(const struct target_backend_ops *ops)
+{
+	struct target_backend *tb, *old;
+
+	tb = kzalloc(sizeof(*tb), GFP_KERNEL);
+	if (!tb)
+		return -ENOMEM;
+	tb->ops = ops;
+
+	mutex_lock(&backend_mutex);
+	list_for_each_entry(old, &backend_list, list) {
+		if (!strcmp(old->ops->name, ops->name)) {
+			pr_err("backend %s already registered.\n", ops->name);
+			mutex_unlock(&backend_mutex);
+			kfree(tb);
 			return -EEXIST;
 		}
 	}
-	list_add_tail(&sub_api->sub_api_list, &subsystem_list);
-	mutex_unlock(&subsystem_mutex);
+	target_setup_backend_cits(tb);
+	list_add_tail(&tb->list, &backend_list);
+	mutex_unlock(&backend_mutex);
 
-	pr_debug("TCM: Registered subsystem plugin: %s struct module:"
-			" %p\n", sub_api->name, sub_api->owner);
+	pr_debug("TCM: Registered subsystem plugin: %s struct module: %p\n",
+			ops->name, ops->owner);
 	return 0;
 }
-EXPORT_SYMBOL(transport_subsystem_register);
+EXPORT_SYMBOL(transport_backend_register);
 
-void transport_subsystem_release(struct se_subsystem_api *sub_api)
+void target_backend_unregister(const struct target_backend_ops *ops)
 {
-	mutex_lock(&subsystem_mutex);
-	list_del(&sub_api->sub_api_list);
-	mutex_unlock(&subsystem_mutex);
+	struct target_backend *tb;
+
+	mutex_lock(&backend_mutex);
+	list_for_each_entry(tb, &backend_list, list) {
+		if (tb->ops == ops) {
+			list_del(&tb->list);
+			kfree(tb);
+			break;
+		}
+	}
+	mutex_unlock(&backend_mutex);
 }
-EXPORT_SYMBOL(transport_subsystem_release);
+EXPORT_SYMBOL(target_backend_unregister);
 
-static struct se_subsystem_api *core_get_backend(const char *sub_name)
+static struct target_backend *core_get_backend(const char *name)
 {
-	struct se_subsystem_api *s;
+	struct target_backend *tb;
 
-	mutex_lock(&subsystem_mutex);
-	list_for_each_entry(s, &subsystem_list, sub_api_list) {
-		if (!strcmp(s->name, sub_name))
+	mutex_lock(&backend_mutex);
+	list_for_each_entry(tb, &backend_list, list) {
+		if (!strcmp(tb->ops->name, name))
 			goto found;
 	}
-	mutex_unlock(&subsystem_mutex);
+	mutex_unlock(&backend_mutex);
 	return NULL;
 found:
-	if (s->owner && !try_module_get(s->owner))
-		s = NULL;
-	mutex_unlock(&subsystem_mutex);
-	return s;
+	if (tb->ops->owner && !try_module_get(tb->ops->owner))
+		tb = NULL;
+	mutex_unlock(&backend_mutex);
+	return tb;
 }
 
 struct se_hba *
@@ -116,13 +128,13 @@ core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
 	hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX);
 	hba->hba_flags |= hba_flags;
 
-	hba->transport = core_get_backend(plugin_name);
-	if (!hba->transport) {
+	hba->backend = core_get_backend(plugin_name);
+	if (!hba->backend) {
 		ret = -EINVAL;
 		goto out_free_hba;
 	}
 
-	ret = hba->transport->attach_hba(hba, plugin_dep_id);
+	ret = hba->backend->ops->attach_hba(hba, plugin_dep_id);
 	if (ret < 0)
 		goto out_module_put;
 
@@ -137,8 +149,8 @@ core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
 	return hba;
 
 out_module_put:
-	module_put(hba->transport->owner);
-	hba->transport = NULL;
+	module_put(hba->backend->ops->owner);
+	hba->backend = NULL;
 out_free_hba:
 	kfree(hba);
 	return ERR_PTR(ret);
@@ -149,7 +161,7 @@ core_delete_hba(struct se_hba *hba)
 {
 	WARN_ON(hba->dev_count);
 
-	hba->transport->detach_hba(hba);
+	hba->backend->ops->detach_hba(hba);
 
 	spin_lock(&hba_lock);
 	list_del(&hba->hba_node);
@@ -158,9 +170,9 @@ core_delete_hba(struct se_hba *hba)
 	pr_debug("CORE_HBA[%d] - Detached HBA from Generic Target"
 			" Core\n", hba->hba_id);
 
-	module_put(hba->transport->owner);
+	module_put(hba->backend->ops->owner);
 
-	hba->transport = NULL;
+	hba->backend = NULL;
 	kfree(hba);
 	return 0;
 }
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 8c965683789f..79f651fb98fb 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -54,12 +54,6 @@ static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
 }
 
 
-static struct se_subsystem_api iblock_template;
-
-/*	iblock_attach_hba(): (Part of se_subsystem_api_t template)
- *
- *
- */
 static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
 {
 	pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
@@ -899,7 +893,7 @@ static struct configfs_attribute *iblock_backend_dev_attrs[] = {
 	NULL,
 };
 
-static struct se_subsystem_api iblock_template = {
+static const struct target_backend_ops iblock_ops = {
 	.name			= "iblock",
 	.inquiry_prod		= "IBLOCK",
 	.inquiry_rev		= IBLOCK_VERSION,
@@ -919,21 +913,17 @@ static struct se_subsystem_api iblock_template = {
 	.get_io_min		= iblock_get_io_min,
 	.get_io_opt		= iblock_get_io_opt,
 	.get_write_cache	= iblock_get_write_cache,
+	.tb_dev_attrib_attrs	= iblock_backend_dev_attrs,
 };
 
 static int __init iblock_module_init(void)
 {
-	struct target_backend_cits *tbc = &iblock_template.tb_cits;
-
-	target_core_setup_sub_cits(&iblock_template);
-	tbc->tb_dev_attrib_cit.ct_attrs = iblock_backend_dev_attrs;
-
-	return transport_subsystem_register(&iblock_template);
+	return transport_backend_register(&iblock_ops);
 }
 
 static void __exit iblock_module_exit(void)
 {
-	transport_subsystem_release(&iblock_template);
+	target_backend_unregister(&iblock_ops);
 }
 
 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index ce80ca76f68b..01181aed67dc 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -1,6 +1,19 @@
 #ifndef TARGET_CORE_INTERNAL_H
 #define TARGET_CORE_INTERNAL_H
 
+struct target_backend {
+	struct list_head list;
+
+	const struct target_backend_ops *ops;
+
+	struct config_item_type tb_dev_cit;
+	struct config_item_type tb_dev_attrib_cit;
+	struct config_item_type tb_dev_pr_cit;
+	struct config_item_type tb_dev_wwn_cit;
+	struct config_item_type tb_dev_alua_tg_pt_gps_cit;
+	struct config_item_type tb_dev_stat_cit;
+};
+
 /* target_core_alua.c */
 extern struct t10_alua_lu_gp *default_lu_gp;
 
@@ -40,6 +53,9 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name);
 int	target_configure_device(struct se_device *dev);
 void	target_free_device(struct se_device *);
 
+/* target_core_configfs.c */
+void	target_setup_backend_cits(struct target_backend *);
+
 /* target_core_fabric_lib.c */
 int	target_get_pr_transport_id_len(struct se_node_acl *nacl,
 		struct t10_pr_registration *pr_reg, int *format_code);
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 21db991b4465..2e3a0b004f9a 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -57,8 +57,6 @@ static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
 	return container_of(dev, struct pscsi_dev_virt, dev);
 }
 
-static struct se_subsystem_api pscsi_template;
-
 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
 static void pscsi_req_done(struct request *, int);
 
@@ -1141,7 +1139,7 @@ static struct configfs_attribute *pscsi_backend_dev_attrs[] = {
 	NULL,
 };
 
-static struct se_subsystem_api pscsi_template = {
+static const struct target_backend_ops pscsi_ops = {
 	.name			= "pscsi",
 	.owner			= THIS_MODULE,
 	.transport_flags	= TRANSPORT_FLAG_PASSTHROUGH,
@@ -1157,21 +1155,17 @@ static struct se_subsystem_api pscsi_template = {
 	.show_configfs_dev_params = pscsi_show_configfs_dev_params,
 	.get_device_type	= pscsi_get_device_type,
 	.get_blocks		= pscsi_get_blocks,
+	.tb_dev_attrib_attrs	= pscsi_backend_dev_attrs,
 };
 
 static int __init pscsi_module_init(void)
 {
-	struct target_backend_cits *tbc = &pscsi_template.tb_cits;
-
-	target_core_setup_sub_cits(&pscsi_template);
-	tbc->tb_dev_attrib_cit.ct_attrs = pscsi_backend_dev_attrs;
-
-	return transport_subsystem_register(&pscsi_template);
+	return transport_backend_register(&pscsi_ops);
 }
 
 static void __exit pscsi_module_exit(void)
 {
-	transport_subsystem_release(&pscsi_template);
+	target_backend_unregister(&pscsi_ops);
 }
 
 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 55315fd0f5d3..cf443a8a3cbe 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -43,10 +43,6 @@ static inline struct rd_dev *RD_DEV(struct se_device *dev)
 	return container_of(dev, struct rd_dev, dev);
 }
 
-/*	rd_attach_hba(): (Part of se_subsystem_api_t template)
- *
- *
- */
 static int rd_attach_hba(struct se_hba *hba, u32 host_id)
 {
 	struct rd_host *rd_host;
@@ -735,7 +731,7 @@ static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = {
 	NULL,
 };
 
-static struct se_subsystem_api rd_mcp_template = {
+static const struct target_backend_ops rd_mcp_ops = {
 	.name			= "rd_mcp",
 	.inquiry_prod		= "RAMDISK-MCP",
 	.inquiry_rev		= RD_MCP_VERSION,
@@ -751,25 +747,15 @@ static struct se_subsystem_api rd_mcp_template = {
 	.get_blocks		= rd_get_blocks,
 	.init_prot		= rd_init_prot,
 	.free_prot		= rd_free_prot,
+	.tb_dev_attrib_attrs	= rd_mcp_backend_dev_attrs,
 };
 
 int __init rd_module_init(void)
 {
-	struct target_backend_cits *tbc = &rd_mcp_template.tb_cits;
-	int ret;
-
-	target_core_setup_sub_cits(&rd_mcp_template);
-	tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs;
-
-	ret = transport_subsystem_register(&rd_mcp_template);
-	if (ret < 0) {
-		return ret;
-	}
-
-	return 0;
+	return transport_backend_register(&rd_mcp_ops);
 }
 
 void rd_module_exit(void)
 {
-	transport_subsystem_release(&rd_mcp_template);
+	target_backend_unregister(&rd_mcp_ops);
 }
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 60330e00f59d..fb67e313dc4f 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1115,7 +1115,7 @@ static struct configfs_attribute *tcmu_backend_dev_attrs[] = {
 	NULL,
 };
 
-static struct se_subsystem_api tcmu_template = {
+static const struct target_backend_ops tcmu_ops = {
 	.name			= "user",
 	.inquiry_prod		= "USER",
 	.inquiry_rev		= TCMU_VERSION,
@@ -1131,11 +1131,11 @@ static struct se_subsystem_api tcmu_template = {
 	.show_configfs_dev_params = tcmu_show_configfs_dev_params,
 	.get_device_type	= sbc_get_device_type,
 	.get_blocks		= tcmu_get_blocks,
+	.tb_dev_attrib_attrs	= tcmu_backend_dev_attrs,
 };
 
 static int __init tcmu_module_init(void)
 {
-	struct target_backend_cits *tbc = &tcmu_template.tb_cits;
 	int ret;
 
 	BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0);
@@ -1158,10 +1158,7 @@ static int __init tcmu_module_init(void)
 		goto out_unreg_device;
 	}
 
-	target_core_setup_sub_cits(&tcmu_template);
-	tbc->tb_dev_attrib_cit.ct_attrs = tcmu_backend_dev_attrs;
-
-	ret = transport_subsystem_register(&tcmu_template);
+	ret = transport_backend_register(&tcmu_ops);
 	if (ret)
 		goto out_unreg_genl;
 
@@ -1179,7 +1176,7 @@ out_free_cache:
 
 static void __exit tcmu_module_exit(void)
 {
-	transport_subsystem_release(&tcmu_template);
+	target_backend_unregister(&tcmu_ops);
 	genl_unregister_family(&tcmu_genl_family);
 	root_device_unregister(tcmu_root_device);
 	kmem_cache_destroy(tcmu_cmd_cache);