/*******************************************************************************
 * Filename:  target_core_configfs.c
 *
 * This file contains ConfigFS logic for the Generic Target Engine project.
 *
 * (c) Copyright 2008-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/syscalls.h>
#include <linux/configfs.h>
#include <linux/spinlock.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_rd.h"
#include "target_core_xcopy.h"

extern struct t10_alua_lu_gp *default_lu_gp;

static LIST_HEAD(g_tf_list);
static DEFINE_MUTEX(g_tf_lock);

struct target_core_configfs_attribute {
	struct configfs_attribute attr;
	ssize_t (*show)(void *, char *);
	ssize_t (*store)(void *, const char *, size_t);
};

static struct config_group target_core_hbagroup;
static struct config_group alua_group;
static struct config_group alua_lu_gps_group;

static inline struct se_hba *
item_to_hba(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_hba, hba_group);
}

/*
 * Attributes for /sys/kernel/config/target/
 */
static ssize_t target_core_attr_show(struct config_item *item,
				      struct configfs_attribute *attr,
				      char *page)
{
	return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
		" on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
		utsname()->sysname, utsname()->machine);
}

static struct configfs_item_operations target_core_fabric_item_ops = {
	.show_attribute = target_core_attr_show,
};

static struct configfs_attribute target_core_item_attr_version = {
	.ca_owner	= THIS_MODULE,
	.ca_name	= "version",
	.ca_mode	= S_IRUGO,
};

static struct target_fabric_configfs *target_core_get_fabric(
	const char *name)
{
	struct target_fabric_configfs *tf;

	if (!name)
		return NULL;

	mutex_lock(&g_tf_lock);
	list_for_each_entry(tf, &g_tf_list, tf_list) {
		if (!strcmp(tf->tf_name, name)) {
			atomic_inc(&tf->tf_access_cnt);
			mutex_unlock(&g_tf_lock);
			return tf;
		}
	}
	mutex_unlock(&g_tf_lock);

	return NULL;
}

/*
 * Called from struct target_core_group_ops->make_group()
 */
static struct config_group *target_core_register_fabric(
	struct config_group *group,
	const char *name)
{
	struct target_fabric_configfs *tf;
	int ret;

	pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
			" %s\n", group, name);
	/*
	 * Below are some hardcoded request_module() calls to automatically
	 * local fabric modules when the following is called:
	 *
	 * mkdir -p /sys/kernel/config/target/$MODULE_NAME
	 *
	 * Note that this does not limit which TCM fabric module can be
	 * registered, but simply provids auto loading logic for modules with
	 * mkdir(2) system calls with known TCM fabric modules.
	 */
	if (!strncmp(name, "iscsi", 5)) {
		/*
		 * Automatically load the LIO Target fabric module when the
		 * following is called:
		 *
		 * mkdir -p $CONFIGFS/target/iscsi
		 */
		ret = request_module("iscsi_target_mod");
		if (ret < 0) {
			pr_err("request_module() failed for"
				" iscsi_target_mod.ko: %d\n", ret);
			return ERR_PTR(-EINVAL);
		}
	} else if (!strncmp(name, "loopback", 8)) {
		/*
		 * Automatically load the tcm_loop fabric module when the
		 * following is called:
		 *
		 * mkdir -p $CONFIGFS/target/loopback
		 */
		ret = request_module("tcm_loop");
		if (ret < 0) {
			pr_err("request_module() failed for"
				" tcm_loop.ko: %d\n", ret);
			return ERR_PTR(-EINVAL);
		}
	}

	tf = target_core_get_fabric(name);
	if (!tf) {
		pr_err("target_core_get_fabric() failed for %s\n",
			name);
		return ERR_PTR(-EINVAL);
	}
	pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
			" %s\n", tf->tf_name);
	/*
	 * On a successful target_core_get_fabric() look, the returned
	 * struct target_fabric_configfs *tf will contain a usage reference.
	 */
	pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
			&tf->tf_cit_tmpl.tfc_wwn_cit);

	tf->tf_group.default_groups = tf->tf_default_groups;
	tf->tf_group.default_groups[0] = &tf->tf_disc_group;
	tf->tf_group.default_groups[1] = NULL;

	config_group_init_type_name(&tf->tf_group, name,
			&tf->tf_cit_tmpl.tfc_wwn_cit);
	config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
			&tf->tf_cit_tmpl.tfc_discovery_cit);

	pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
			" %s\n", tf->tf_group.cg_item.ci_name);
	/*
	 * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
	 */
	tf->tf_ops.tf_subsys = tf->tf_subsys;
	tf->tf_fabric = &tf->tf_group.cg_item;
	pr_debug("Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
			" for %s\n", name);

	return &tf->tf_group;
}

/*
 * Called from struct target_core_group_ops->drop_item()
 */
static void target_core_deregister_fabric(
	struct config_group *group,
	struct config_item *item)
{
	struct target_fabric_configfs *tf = container_of(
		to_config_group(item), struct target_fabric_configfs, tf_group);
	struct config_group *tf_group;
	struct config_item *df_item;
	int i;

	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
		" tf list\n", config_item_name(item));

	pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
			" %s\n", tf->tf_name);
	atomic_dec(&tf->tf_access_cnt);

	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing"
			" tf->tf_fabric for %s\n", tf->tf_name);
	tf->tf_fabric = NULL;

	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
			" %s\n", config_item_name(item));

	tf_group = &tf->tf_group;
	for (i = 0; tf_group->default_groups[i]; i++) {
		df_item = &tf_group->default_groups[i]->cg_item;
		tf_group->default_groups[i] = NULL;
		config_item_put(df_item);
	}
	config_item_put(item);
}

static struct configfs_group_operations target_core_fabric_group_ops = {
	.make_group	= &target_core_register_fabric,
	.drop_item	= &target_core_deregister_fabric,
};

/*
 * All item attributes appearing in /sys/kernel/target/ appear here.
 */
static struct configfs_attribute *target_core_fabric_item_attrs[] = {
	&target_core_item_attr_version,
	NULL,
};

/*
 * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 */
static struct config_item_type target_core_fabrics_item = {
	.ct_item_ops	= &target_core_fabric_item_ops,
	.ct_group_ops	= &target_core_fabric_group_ops,
	.ct_attrs	= target_core_fabric_item_attrs,
	.ct_owner	= THIS_MODULE,
};

static struct configfs_subsystem target_core_fabrics = {
	.su_group = {
		.cg_item = {
			.ci_namebuf = "target",
			.ci_type = &target_core_fabrics_item,
		},
	},
};

struct configfs_subsystem *target_core_subsystem[] = {
	&target_core_fabrics,
	NULL,
};

/*##############################################################################
// Start functions called by external Target Fabrics Modules
//############################################################################*/

/*
 * First function called by fabric modules to:
 *
 * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
 * 2) Add struct target_fabric_configfs to g_tf_list
 * 3) Return struct target_fabric_configfs to fabric module to be passed
 *    into target_fabric_configfs_register().
 */
struct target_fabric_configfs *target_fabric_configfs_init(
	struct module *fabric_mod,
	const char *name)
{
	struct target_fabric_configfs *tf;

	if (!(name)) {
		pr_err("Unable to locate passed fabric name\n");
		return ERR_PTR(-EINVAL);
	}
	if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
		pr_err("Passed name: %s exceeds TARGET_FABRIC"
			"_NAME_SIZE\n", name);
		return ERR_PTR(-EINVAL);
	}

	tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
	if (!tf)
		return ERR_PTR(-ENOMEM);

	INIT_LIST_HEAD(&tf->tf_list);
	atomic_set(&tf->tf_access_cnt, 0);
	/*
	 * Setup the default generic struct config_item_type's (cits) in
	 * struct target_fabric_configfs->tf_cit_tmpl
	 */
	tf->tf_module = fabric_mod;
	target_fabric_setup_cits(tf);

	tf->tf_subsys = target_core_subsystem[0];
	snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);

	mutex_lock(&g_tf_lock);
	list_add_tail(&tf->tf_list, &g_tf_list);
	mutex_unlock(&g_tf_lock);

	pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
			">>>>>>>>>>>>>>\n");
	pr_debug("Initialized struct target_fabric_configfs: %p for"
			" %s\n", tf, tf->tf_name);
	return tf;
}
EXPORT_SYMBOL(target_fabric_configfs_init);

/*
 * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
 */
void target_fabric_configfs_free(
	struct target_fabric_configfs *tf)
{
	mutex_lock(&g_tf_lock);
	list_del(&tf->tf_list);
	mutex_unlock(&g_tf_lock);

	kfree(tf);
}
EXPORT_SYMBOL(target_fabric_configfs_free);

/*
 * Perform a sanity check of the passed tf->tf_ops before completing
 * TCM fabric module registration.
 */
static int target_fabric_tf_ops_check(
	struct target_fabric_configfs *tf)
{
	struct target_core_fabric_ops *tfo = &tf->tf_ops;

	if (!tfo->get_fabric_name) {
		pr_err("Missing tfo->get_fabric_name()\n");
		return -EINVAL;
	}
	if (!tfo->get_fabric_proto_ident) {
		pr_err("Missing tfo->get_fabric_proto_ident()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_wwn) {
		pr_err("Missing tfo->tpg_get_wwn()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_tag) {
		pr_err("Missing tfo->tpg_get_tag()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_default_depth) {
		pr_err("Missing tfo->tpg_get_default_depth()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_pr_transport_id) {
		pr_err("Missing tfo->tpg_get_pr_transport_id()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_pr_transport_id_len) {
		pr_err("Missing tfo->tpg_get_pr_transport_id_len()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_check_demo_mode) {
		pr_err("Missing tfo->tpg_check_demo_mode()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_check_demo_mode_cache) {
		pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_check_demo_mode_write_protect) {
		pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_check_prod_mode_write_protect) {
		pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_alloc_fabric_acl) {
		pr_err("Missing tfo->tpg_alloc_fabric_acl()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_release_fabric_acl) {
		pr_err("Missing tfo->tpg_release_fabric_acl()\n");
		return -EINVAL;
	}
	if (!tfo->tpg_get_inst_index) {
		pr_err("Missing tfo->tpg_get_inst_index()\n");
		return -EINVAL;
	}
	if (!tfo->release_cmd) {
		pr_err("Missing tfo->release_cmd()\n");
		return -EINVAL;
	}
	if (!tfo->shutdown_session) {
		pr_err("Missing tfo->shutdown_session()\n");
		return -EINVAL;
	}
	if (!tfo->close_session) {
		pr_err("Missing tfo->close_session()\n");
		return -EINVAL;
	}
	if (!tfo->sess_get_index) {
		pr_err("Missing tfo->sess_get_index()\n");
		return -EINVAL;
	}
	if (!tfo->write_pending) {
		pr_err("Missing tfo->write_pending()\n");
		return -EINVAL;
	}
	if (!tfo->write_pending_status) {
		pr_err("Missing tfo->write_pending_status()\n");
		return -EINVAL;
	}
	if (!tfo->set_default_node_attributes) {
		pr_err("Missing tfo->set_default_node_attributes()\n");
		return -EINVAL;
	}
	if (!tfo->get_task_tag) {
		pr_err("Missing tfo->get_task_tag()\n");
		return -EINVAL;
	}
	if (!tfo->get_cmd_state) {
		pr_err("Missing tfo->get_cmd_state()\n");
		return -EINVAL;
	}
	if (!tfo->queue_data_in) {
		pr_err("Missing tfo->queue_data_in()\n");
		return -EINVAL;
	}
	if (!tfo->queue_status) {
		pr_err("Missing tfo->queue_status()\n");
		return -EINVAL;
	}
	if (!tfo->queue_tm_rsp) {
		pr_err("Missing tfo->queue_tm_rsp()\n");
		return -EINVAL;
	}
	/*
	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
	 * target_core_fabric_configfs.c WWN+TPG group context code.
	 */
	if (!tfo->fabric_make_wwn) {
		pr_err("Missing tfo->fabric_make_wwn()\n");
		return -EINVAL;
	}
	if (!tfo->fabric_drop_wwn) {
		pr_err("Missing tfo->fabric_drop_wwn()\n");
		return -EINVAL;
	}
	if (!tfo->fabric_make_tpg) {
		pr_err("Missing tfo->fabric_make_tpg()\n");
		return -EINVAL;
	}
	if (!tfo->fabric_drop_tpg) {
		pr_err("Missing tfo->fabric_drop_tpg()\n");
		return -EINVAL;
	}

	return 0;
}

/*
 * Called 2nd from fabric module with returned parameter of
 * struct target_fabric_configfs * from target_fabric_configfs_init().
 *
 * Upon a successful registration, the new fabric's struct config_item is
 * return.  Also, a pointer to this struct is set in the passed
 * struct target_fabric_configfs.
 */
int target_fabric_configfs_register(
	struct target_fabric_configfs *tf)
{
	int ret;

	if (!tf) {
		pr_err("Unable to locate target_fabric_configfs"
			" pointer\n");
		return -EINVAL;
	}
	if (!tf->tf_subsys) {
		pr_err("Unable to target struct config_subsystem"
			" pointer\n");
		return -EINVAL;
	}
	ret = target_fabric_tf_ops_check(tf);
	if (ret < 0)
		return ret;

	pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
		">>>>>>>>>>\n");
	return 0;
}
EXPORT_SYMBOL(target_fabric_configfs_register);

void target_fabric_configfs_deregister(
	struct target_fabric_configfs *tf)
{
	struct configfs_subsystem *su;

	if (!tf) {
		pr_err("Unable to locate passed target_fabric_"
			"configfs\n");
		return;
	}
	su = tf->tf_subsys;
	if (!su) {
		pr_err("Unable to locate passed tf->tf_subsys"
			" pointer\n");
		return;
	}
	pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
			">>>>>>>>>>>>\n");
	mutex_lock(&g_tf_lock);
	if (atomic_read(&tf->tf_access_cnt)) {
		mutex_unlock(&g_tf_lock);
		pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
			tf->tf_name);
		BUG();
	}
	list_del(&tf->tf_list);
	mutex_unlock(&g_tf_lock);

	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
			" %s\n", tf->tf_name);
	tf->tf_module = NULL;
	tf->tf_subsys = NULL;
	kfree(tf);

	pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
			">>>>>\n");
}
EXPORT_SYMBOL(target_fabric_configfs_deregister);

/*##############################################################################
// Stop functions called by external Target Fabrics Modules
//############################################################################*/

/* Start functions for struct config_item_type target_core_dev_attrib_cit */

#define DEF_DEV_ATTRIB_SHOW(_name)					\
static ssize_t target_core_dev_show_attr_##_name(			\
	struct se_dev_attrib *da,					\
	char *page)							\
{									\
	return snprintf(page, PAGE_SIZE, "%u\n",			\
		(u32)da->da_dev->dev_attrib._name);			\
}

#define DEF_DEV_ATTRIB_STORE(_name)					\
static ssize_t target_core_dev_store_attr_##_name(			\
	struct se_dev_attrib *da,					\
	const char *page,						\
	size_t count)							\
{									\
	unsigned long val;						\
	int ret;							\
									\
	ret = kstrtoul(page, 0, &val);				\
	if (ret < 0) {							\
		pr_err("kstrtoul() failed with"		\
			" ret: %d\n", ret);				\
		return -EINVAL;						\
	}								\
	ret = se_dev_set_##_name(da->da_dev, (u32)val);			\
									\
	return (!ret) ? count : -EINVAL;				\
}

#define DEF_DEV_ATTRIB(_name)						\
DEF_DEV_ATTRIB_SHOW(_name);						\
DEF_DEV_ATTRIB_STORE(_name);

#define DEF_DEV_ATTRIB_RO(_name)					\
DEF_DEV_ATTRIB_SHOW(_name);

CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
#define SE_DEV_ATTR(_name, _mode)					\
static struct target_core_dev_attrib_attribute				\
			target_core_dev_attrib_##_name =		\
		__CONFIGFS_EATTR(_name, _mode,				\
		target_core_dev_show_attr_##_name,			\
		target_core_dev_store_attr_##_name);

#define SE_DEV_ATTR_RO(_name);						\
static struct target_core_dev_attrib_attribute				\
			target_core_dev_attrib_##_name =		\
	__CONFIGFS_EATTR_RO(_name,					\
	target_core_dev_show_attr_##_name);

DEF_DEV_ATTRIB(emulate_model_alias);
SE_DEV_ATTR(emulate_model_alias, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_dpo);
SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_fua_write);
SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_fua_read);
SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_write_cache);
SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_tas);
SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_tpu);
SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_tpws);
SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_caw);
SE_DEV_ATTR(emulate_caw, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_3pc);
SE_DEV_ATTR(emulate_3pc, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(enforce_pr_isids);
SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(is_nonrot);
SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(emulate_rest_reord);
SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB_RO(hw_block_size);
SE_DEV_ATTR_RO(hw_block_size);

DEF_DEV_ATTRIB(block_size);
SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB_RO(hw_max_sectors);
SE_DEV_ATTR_RO(hw_max_sectors);

DEF_DEV_ATTRIB(fabric_max_sectors);
SE_DEV_ATTR(fabric_max_sectors, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(optimal_sectors);
SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB_RO(hw_queue_depth);
SE_DEV_ATTR_RO(hw_queue_depth);

DEF_DEV_ATTRIB(queue_depth);
SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(max_unmap_lba_count);
SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(max_unmap_block_desc_count);
SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(unmap_granularity);
SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(unmap_granularity_alignment);
SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);

DEF_DEV_ATTRIB(max_write_same_len);
SE_DEV_ATTR(max_write_same_len, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);

static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
	&target_core_dev_attrib_emulate_model_alias.attr,
	&target_core_dev_attrib_emulate_dpo.attr,
	&target_core_dev_attrib_emulate_fua_write.attr,
	&target_core_dev_attrib_emulate_fua_read.attr,
	&target_core_dev_attrib_emulate_write_cache.attr,
	&target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
	&target_core_dev_attrib_emulate_tas.attr,
	&target_core_dev_attrib_emulate_tpu.attr,
	&target_core_dev_attrib_emulate_tpws.attr,
	&target_core_dev_attrib_emulate_caw.attr,
	&target_core_dev_attrib_emulate_3pc.attr,
	&target_core_dev_attrib_enforce_pr_isids.attr,
	&target_core_dev_attrib_is_nonrot.attr,
	&target_core_dev_attrib_emulate_rest_reord.attr,
	&target_core_dev_attrib_hw_block_size.attr,
	&target_core_dev_attrib_block_size.attr,
	&target_core_dev_attrib_hw_max_sectors.attr,
	&target_core_dev_attrib_fabric_max_sectors.attr,
	&target_core_dev_attrib_optimal_sectors.attr,
	&target_core_dev_attrib_hw_queue_depth.attr,
	&target_core_dev_attrib_queue_depth.attr,
	&target_core_dev_attrib_max_unmap_lba_count.attr,
	&target_core_dev_attrib_max_unmap_block_desc_count.attr,
	&target_core_dev_attrib_unmap_granularity.attr,
	&target_core_dev_attrib_unmap_granularity_alignment.attr,
	&target_core_dev_attrib_max_write_same_len.attr,
	NULL,
};

static struct configfs_item_operations target_core_dev_attrib_ops = {
	.show_attribute		= target_core_dev_attrib_attr_show,
	.store_attribute	= target_core_dev_attrib_attr_store,
};

static struct config_item_type target_core_dev_attrib_cit = {
	.ct_item_ops		= &target_core_dev_attrib_ops,
	.ct_attrs		= target_core_dev_attrib_attrs,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_dev_attrib_cit */

/*  Start functions for struct config_item_type target_core_dev_wwn_cit */

CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
#define SE_DEV_WWN_ATTR(_name, _mode)					\
static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
		__CONFIGFS_EATTR(_name, _mode,				\
		target_core_dev_wwn_show_attr_##_name,			\
		target_core_dev_wwn_store_attr_##_name);

#define SE_DEV_WWN_ATTR_RO(_name);					\
do {									\
	static struct target_core_dev_wwn_attribute			\
			target_core_dev_wwn_##_name =			\
		__CONFIGFS_EATTR_RO(_name,				\
		target_core_dev_wwn_show_attr_##_name);			\
} while (0);

/*
 * VPD page 0x80 Unit serial
 */
static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
	struct t10_wwn *t10_wwn,
	char *page)
{
	return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
		&t10_wwn->unit_serial[0]);
}

static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
	struct t10_wwn *t10_wwn,
	const char *page,
	size_t count)
{
	struct se_device *dev = t10_wwn->t10_dev;
	unsigned char buf[INQUIRY_VPD_SERIAL_LEN];

	/*
	 * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
	 * from the struct scsi_device level firmware, do not allow
	 * VPD Unit Serial to be emulated.
	 *
	 * Note this struct scsi_device could also be emulating VPD
	 * information from its drivers/scsi LLD.  But for now we assume
	 * it is doing 'the right thing' wrt a world wide unique
	 * VPD Unit Serial Number that OS dependent multipath can depend on.
	 */
	if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
		pr_err("Underlying SCSI device firmware provided VPD"
			" Unit Serial, ignoring request\n");
		return -EOPNOTSUPP;
	}

	if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
		pr_err("Emulated VPD Unit Serial exceeds"
		" INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
		return -EOVERFLOW;
	}
	/*
	 * Check to see if any active $FABRIC_MOD exports exist.  If they
	 * do exist, fail here as changing this information on the fly
	 * (underneath the initiator side OS dependent multipath code)
	 * could cause negative effects.
	 */
	if (dev->export_count) {
		pr_err("Unable to set VPD Unit Serial while"
			" active %d $FABRIC_MOD exports exist\n",
			dev->export_count);
		return -EINVAL;
	}

	/*
	 * This currently assumes ASCII encoding for emulated VPD Unit Serial.
	 *
	 * Also, strip any newline added from the userspace
	 * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
	 */
	memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
	snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
	snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
			"%s", strstrip(buf));
	dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;

	pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
			" %s\n", dev->t10_wwn.unit_serial);

	return count;
}

SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);

/*
 * VPD page 0x83 Protocol Identifier
 */
static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
	struct t10_wwn *t10_wwn,
	char *page)
{
	struct t10_vpd *vpd;
	unsigned char buf[VPD_TMP_BUF_SIZE];
	ssize_t len = 0;

	memset(buf, 0, VPD_TMP_BUF_SIZE);

	spin_lock(&t10_wwn->t10_vpd_lock);
	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
		if (!vpd->protocol_identifier_set)
			continue;

		transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);

		if (len + strlen(buf) >= PAGE_SIZE)
			break;

		len += sprintf(page+len, "%s", buf);
	}
	spin_unlock(&t10_wwn->t10_vpd_lock);

	return len;
}

static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
	struct t10_wwn *t10_wwn,
	const char *page,
	size_t count)
{
	return -ENOSYS;
}

SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);

/*
 * Generic wrapper for dumping VPD identifiers by association.
 */
#define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)				\
static ssize_t target_core_dev_wwn_show_attr_##_name(			\
	struct t10_wwn *t10_wwn,					\
	char *page)							\
{									\
	struct t10_vpd *vpd;							\
	unsigned char buf[VPD_TMP_BUF_SIZE];				\
	ssize_t len = 0;						\
									\
	spin_lock(&t10_wwn->t10_vpd_lock);				\
	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {	\
		if (vpd->association != _assoc)				\
			continue;					\
									\
		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
		transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);	\
		if (len + strlen(buf) >= PAGE_SIZE)			\
			break;						\
		len += sprintf(page+len, "%s", buf);			\
									\
		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
		transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
		if (len + strlen(buf) >= PAGE_SIZE)			\
			break;						\
		len += sprintf(page+len, "%s", buf);			\
									\
		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
		transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
		if (len + strlen(buf) >= PAGE_SIZE)			\
			break;						\
		len += sprintf(page+len, "%s", buf);			\
	}								\
	spin_unlock(&t10_wwn->t10_vpd_lock);				\
									\
	return len;							\
}

/*
 * VPD page 0x83 Association: Logical Unit
 */
DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);

static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
	struct t10_wwn *t10_wwn,
	const char *page,
	size_t count)
{
	return -ENOSYS;
}

SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);

/*
 * VPD page 0x83 Association: Target Port
 */
DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);

static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
	struct t10_wwn *t10_wwn,
	const char *page,
	size_t count)
{
	return -ENOSYS;
}

SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);

/*
 * VPD page 0x83 Association: SCSI Target Device
 */
DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);

static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
	struct t10_wwn *t10_wwn,
	const char *page,
	size_t count)
{
	return -ENOSYS;
}

SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);

static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
	&target_core_dev_wwn_vpd_unit_serial.attr,
	&target_core_dev_wwn_vpd_protocol_identifier.attr,
	&target_core_dev_wwn_vpd_assoc_logical_unit.attr,
	&target_core_dev_wwn_vpd_assoc_target_port.attr,
	&target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
	NULL,
};

static struct configfs_item_operations target_core_dev_wwn_ops = {
	.show_attribute		= target_core_dev_wwn_attr_show,
	.store_attribute	= target_core_dev_wwn_attr_store,
};

static struct config_item_type target_core_dev_wwn_cit = {
	.ct_item_ops		= &target_core_dev_wwn_ops,
	.ct_attrs		= target_core_dev_wwn_attrs,
	.ct_owner		= THIS_MODULE,
};

/*  End functions for struct config_item_type target_core_dev_wwn_cit */

/*  Start functions for struct config_item_type target_core_dev_pr_cit */

CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_device);
#define SE_DEV_PR_ATTR(_name, _mode)					\
static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
	__CONFIGFS_EATTR(_name, _mode,					\
	target_core_dev_pr_show_attr_##_name,				\
	target_core_dev_pr_store_attr_##_name);

#define SE_DEV_PR_ATTR_RO(_name);					\
static struct target_core_dev_pr_attribute target_core_dev_pr_##_name =	\
	__CONFIGFS_EATTR_RO(_name,					\
	target_core_dev_pr_show_attr_##_name);

static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
		char *page)
{
	struct se_node_acl *se_nacl;
	struct t10_pr_registration *pr_reg;
	char i_buf[PR_REG_ISID_ID_LEN];

	memset(i_buf, 0, PR_REG_ISID_ID_LEN);

	pr_reg = dev->dev_pr_res_holder;
	if (!pr_reg)
		return sprintf(page, "No SPC-3 Reservation holder\n");

	se_nacl = pr_reg->pr_reg_nacl;
	core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);

	return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
		se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
		se_nacl->initiatorname, i_buf);
}

static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
		char *page)
{
	struct se_node_acl *se_nacl;
	ssize_t len;

	se_nacl = dev->dev_reserved_node_acl;
	if (se_nacl) {
		len = sprintf(page,
			      "SPC-2 Reservation: %s Initiator: %s\n",
			      se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
			      se_nacl->initiatorname);
	} else {
		len = sprintf(page, "No SPC-2 Reservation holder\n");
	}
	return len;
}

static ssize_t target_core_dev_pr_show_attr_res_holder(struct se_device *dev,
		char *page)
{
	int ret;

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return sprintf(page, "Passthrough\n");

	spin_lock(&dev->dev_reservation_lock);
	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
		ret = target_core_dev_pr_show_spc2_res(dev, page);
	else
		ret = target_core_dev_pr_show_spc3_res(dev, page);
	spin_unlock(&dev->dev_reservation_lock);
	return ret;
}

SE_DEV_PR_ATTR_RO(res_holder);

static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
		struct se_device *dev, char *page)
{
	ssize_t len = 0;

	spin_lock(&dev->dev_reservation_lock);
	if (!dev->dev_pr_res_holder) {
		len = sprintf(page, "No SPC-3 Reservation holder\n");
	} else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
		len = sprintf(page, "SPC-3 Reservation: All Target"
			" Ports registration\n");
	} else {
		len = sprintf(page, "SPC-3 Reservation: Single"
			" Target Port registration\n");
	}

	spin_unlock(&dev->dev_reservation_lock);
	return len;
}

SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);

static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
		struct se_device *dev, char *page)
{
	return sprintf(page, "0x%08x\n", dev->t10_pr.pr_generation);
}

SE_DEV_PR_ATTR_RO(res_pr_generation);

/*
 * res_pr_holder_tg_port
 */
static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
		struct se_device *dev, char *page)
{
	struct se_node_acl *se_nacl;
	struct se_lun *lun;
	struct se_portal_group *se_tpg;
	struct t10_pr_registration *pr_reg;
	struct target_core_fabric_ops *tfo;
	ssize_t len = 0;

	spin_lock(&dev->dev_reservation_lock);
	pr_reg = dev->dev_pr_res_holder;
	if (!pr_reg) {
		len = sprintf(page, "No SPC-3 Reservation holder\n");
		goto out_unlock;
	}

	se_nacl = pr_reg->pr_reg_nacl;
	se_tpg = se_nacl->se_tpg;
	lun = pr_reg->pr_reg_tg_pt_lun;
	tfo = se_tpg->se_tpg_tfo;

	len += sprintf(page+len, "SPC-3 Reservation: %s"
		" Target Node Endpoint: %s\n", tfo->get_fabric_name(),
		tfo->tpg_get_wwn(se_tpg));
	len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
		" Identifier Tag: %hu %s Portal Group Tag: %hu"
		" %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
		tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
		tfo->get_fabric_name(), lun->unpacked_lun);

out_unlock:
	spin_unlock(&dev->dev_reservation_lock);
	return len;
}

SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);

static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
		struct se_device *dev, char *page)
{
	struct target_core_fabric_ops *tfo;
	struct t10_pr_registration *pr_reg;
	unsigned char buf[384];
	char i_buf[PR_REG_ISID_ID_LEN];
	ssize_t len = 0;
	int reg_count = 0;

	len += sprintf(page+len, "SPC-3 PR Registrations:\n");

	spin_lock(&dev->t10_pr.registration_lock);
	list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
			pr_reg_list) {

		memset(buf, 0, 384);
		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
		tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
		core_pr_dump_initiator_port(pr_reg, i_buf,
					PR_REG_ISID_ID_LEN);
		sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
			tfo->get_fabric_name(),
			pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
			pr_reg->pr_res_generation);

		if (len + strlen(buf) >= PAGE_SIZE)
			break;

		len += sprintf(page+len, "%s", buf);
		reg_count++;
	}
	spin_unlock(&dev->t10_pr.registration_lock);

	if (!reg_count)
		len += sprintf(page+len, "None\n");

	return len;
}

SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);

static ssize_t target_core_dev_pr_show_attr_res_pr_type(
		struct se_device *dev, char *page)
{
	struct t10_pr_registration *pr_reg;
	ssize_t len = 0;

	spin_lock(&dev->dev_reservation_lock);
	pr_reg = dev->dev_pr_res_holder;
	if (pr_reg) {
		len = sprintf(page, "SPC-3 Reservation Type: %s\n",
			core_scsi3_pr_dump_type(pr_reg->pr_res_type));
	} else {
		len = sprintf(page, "No SPC-3 Reservation holder\n");
	}

	spin_unlock(&dev->dev_reservation_lock);
	return len;
}

SE_DEV_PR_ATTR_RO(res_pr_type);

static ssize_t target_core_dev_pr_show_attr_res_type(
		struct se_device *dev, char *page)
{
	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return sprintf(page, "SPC_PASSTHROUGH\n");
	else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
		return sprintf(page, "SPC2_RESERVATIONS\n");
	else
		return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
}

SE_DEV_PR_ATTR_RO(res_type);

static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
		struct se_device *dev, char *page)
{
	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return 0;

	return sprintf(page, "APTPL Bit Status: %s\n",
		(dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
}

SE_DEV_PR_ATTR_RO(res_aptpl_active);

/*
 * res_aptpl_metadata
 */
static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
		struct se_device *dev, char *page)
{
	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return 0;

	return sprintf(page, "Ready to process PR APTPL metadata..\n");
}

enum {
	Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
	Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
	Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
	Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
};

static match_table_t tokens = {
	{Opt_initiator_fabric, "initiator_fabric=%s"},
	{Opt_initiator_node, "initiator_node=%s"},
	{Opt_initiator_sid, "initiator_sid=%s"},
	{Opt_sa_res_key, "sa_res_key=%s"},
	{Opt_res_holder, "res_holder=%d"},
	{Opt_res_type, "res_type=%d"},
	{Opt_res_scope, "res_scope=%d"},
	{Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
	{Opt_mapped_lun, "mapped_lun=%d"},
	{Opt_target_fabric, "target_fabric=%s"},
	{Opt_target_node, "target_node=%s"},
	{Opt_tpgt, "tpgt=%d"},
	{Opt_port_rtpi, "port_rtpi=%d"},
	{Opt_target_lun, "target_lun=%d"},
	{Opt_err, NULL}
};

static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
	struct se_device *dev,
	const char *page,
	size_t count)
{
	unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
	unsigned char *t_fabric = NULL, *t_port = NULL;
	char *orig, *ptr, *arg_p, *opts;
	substring_t args[MAX_OPT_ARGS];
	unsigned long long tmp_ll;
	u64 sa_res_key = 0;
	u32 mapped_lun = 0, target_lun = 0;
	int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
	u16 port_rpti = 0, tpgt = 0;
	u8 type = 0, scope;

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return 0;
	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
		return 0;

	if (dev->export_count) {
		pr_debug("Unable to process APTPL metadata while"
			" active fabric exports exist\n");
		return -EINVAL;
	}

	opts = kstrdup(page, GFP_KERNEL);
	if (!opts)
		return -ENOMEM;

	orig = opts;
	while ((ptr = strsep(&opts, ",\n")) != NULL) {
		if (!*ptr)
			continue;

		token = match_token(ptr, tokens, args);
		switch (token) {
		case Opt_initiator_fabric:
			i_fabric = match_strdup(&args[0]);
			if (!i_fabric) {
				ret = -ENOMEM;
				goto out;
			}
			break;
		case Opt_initiator_node:
			i_port = match_strdup(&args[0]);
			if (!i_port) {
				ret = -ENOMEM;
				goto out;
			}
			if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
				pr_err("APTPL metadata initiator_node="
					" exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
					PR_APTPL_MAX_IPORT_LEN);
				ret = -EINVAL;
				break;
			}
			break;
		case Opt_initiator_sid:
			isid = match_strdup(&args[0]);
			if (!isid) {
				ret = -ENOMEM;
				goto out;
			}
			if (strlen(isid) >= PR_REG_ISID_LEN) {
				pr_err("APTPL metadata initiator_isid"
					"= exceeds PR_REG_ISID_LEN: %d\n",
					PR_REG_ISID_LEN);
				ret = -EINVAL;
				break;
			}
			break;
		case Opt_sa_res_key:
			arg_p = match_strdup(&args[0]);
			if (!arg_p) {
				ret = -ENOMEM;
				goto out;
			}
			ret = kstrtoull(arg_p, 0, &tmp_ll);
			if (ret < 0) {
				pr_err("kstrtoull() failed for"
					" sa_res_key=\n");
				goto out;
			}
			sa_res_key = (u64)tmp_ll;
			break;
		/*
		 * PR APTPL Metadata for Reservation
		 */
		case Opt_res_holder:
			match_int(args, &arg);
			res_holder = arg;
			break;
		case Opt_res_type:
			match_int(args, &arg);
			type = (u8)arg;
			break;
		case Opt_res_scope:
			match_int(args, &arg);
			scope = (u8)arg;
			break;
		case Opt_res_all_tg_pt:
			match_int(args, &arg);
			all_tg_pt = (int)arg;
			break;
		case Opt_mapped_lun:
			match_int(args, &arg);
			mapped_lun = (u32)arg;
			break;
		/*
		 * PR APTPL Metadata for Target Port
		 */
		case Opt_target_fabric:
			t_fabric = match_strdup(&args[0]);
			if (!t_fabric) {
				ret = -ENOMEM;
				goto out;
			}
			break;
		case Opt_target_node:
			t_port = match_strdup(&args[0]);
			if (!t_port) {
				ret = -ENOMEM;
				goto out;
			}
			if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
				pr_err("APTPL metadata target_node="
					" exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
					PR_APTPL_MAX_TPORT_LEN);
				ret = -EINVAL;
				break;
			}
			break;
		case Opt_tpgt:
			match_int(args, &arg);
			tpgt = (u16)arg;
			break;
		case Opt_port_rtpi:
			match_int(args, &arg);
			port_rpti = (u16)arg;
			break;
		case Opt_target_lun:
			match_int(args, &arg);
			target_lun = (u32)arg;
			break;
		default:
			break;
		}
	}

	if (!i_port || !t_port || !sa_res_key) {
		pr_err("Illegal parameters for APTPL registration\n");
		ret = -EINVAL;
		goto out;
	}

	if (res_holder && !(type)) {
		pr_err("Illegal PR type: 0x%02x for reservation"
				" holder\n", type);
		ret = -EINVAL;
		goto out;
	}

	ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
			i_port, isid, mapped_lun, t_port, tpgt, target_lun,
			res_holder, all_tg_pt, type);
out:
	kfree(i_fabric);
	kfree(i_port);
	kfree(isid);
	kfree(t_fabric);
	kfree(t_port);
	kfree(orig);
	return (ret == 0) ? count : ret;
}

SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_dev_pr, se_device, dev_pr_group);

static struct configfs_attribute *target_core_dev_pr_attrs[] = {
	&target_core_dev_pr_res_holder.attr,
	&target_core_dev_pr_res_pr_all_tgt_pts.attr,
	&target_core_dev_pr_res_pr_generation.attr,
	&target_core_dev_pr_res_pr_holder_tg_port.attr,
	&target_core_dev_pr_res_pr_registered_i_pts.attr,
	&target_core_dev_pr_res_pr_type.attr,
	&target_core_dev_pr_res_type.attr,
	&target_core_dev_pr_res_aptpl_active.attr,
	&target_core_dev_pr_res_aptpl_metadata.attr,
	NULL,
};

static struct configfs_item_operations target_core_dev_pr_ops = {
	.show_attribute		= target_core_dev_pr_attr_show,
	.store_attribute	= target_core_dev_pr_attr_store,
};

static struct config_item_type target_core_dev_pr_cit = {
	.ct_item_ops		= &target_core_dev_pr_ops,
	.ct_attrs		= target_core_dev_pr_attrs,
	.ct_owner		= THIS_MODULE,
};

/*  End functions for struct config_item_type target_core_dev_pr_cit */

/*  Start functions for struct config_item_type target_core_dev_cit */

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);
	return read_bytes;
}

static struct target_core_configfs_attribute target_core_attr_dev_info = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "info",
		    .ca_mode = S_IRUGO },
	.show	= target_core_show_dev_info,
	.store	= NULL,
};

static ssize_t target_core_store_dev_control(
	void *p,
	const char *page,
	size_t count)
{
	struct se_device *dev = p;
	struct se_subsystem_api *t = dev->transport;

	return t->set_configfs_dev_params(dev, page, count);
}

static struct target_core_configfs_attribute target_core_attr_dev_control = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "control",
		    .ca_mode = S_IWUSR },
	.show	= NULL,
	.store	= target_core_store_dev_control,
};

static ssize_t target_core_show_dev_alias(void *p, char *page)
{
	struct se_device *dev = p;

	if (!(dev->dev_flags & DF_USING_ALIAS))
		return 0;

	return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
}

static ssize_t target_core_store_dev_alias(
	void *p,
	const char *page,
	size_t count)
{
	struct se_device *dev = p;
	struct se_hba *hba = dev->se_hba;
	ssize_t read_bytes;

	if (count > (SE_DEV_ALIAS_LEN-1)) {
		pr_err("alias count: %d exceeds"
			" SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
			SE_DEV_ALIAS_LEN-1);
		return -EINVAL;
	}

	read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
	if (!read_bytes)
		return -EINVAL;
	if (dev->dev_alias[read_bytes - 1] == '\n')
		dev->dev_alias[read_bytes - 1] = '\0';

	dev->dev_flags |= DF_USING_ALIAS;

	pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
		config_item_name(&hba->hba_group.cg_item),
		config_item_name(&dev->dev_group.cg_item),
		dev->dev_alias);

	return read_bytes;
}

static struct target_core_configfs_attribute target_core_attr_dev_alias = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "alias",
		    .ca_mode =  S_IRUGO | S_IWUSR },
	.show	= target_core_show_dev_alias,
	.store	= target_core_store_dev_alias,
};

static ssize_t target_core_show_dev_udev_path(void *p, char *page)
{
	struct se_device *dev = p;

	if (!(dev->dev_flags & DF_USING_UDEV_PATH))
		return 0;

	return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
}

static ssize_t target_core_store_dev_udev_path(
	void *p,
	const char *page,
	size_t count)
{
	struct se_device *dev = p;
	struct se_hba *hba = dev->se_hba;
	ssize_t read_bytes;

	if (count > (SE_UDEV_PATH_LEN-1)) {
		pr_err("udev_path count: %d exceeds"
			" SE_UDEV_PATH_LEN-1: %u\n", (int)count,
			SE_UDEV_PATH_LEN-1);
		return -EINVAL;
	}

	read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
			"%s", page);
	if (!read_bytes)
		return -EINVAL;
	if (dev->udev_path[read_bytes - 1] == '\n')
		dev->udev_path[read_bytes - 1] = '\0';

	dev->dev_flags |= DF_USING_UDEV_PATH;

	pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
		config_item_name(&hba->hba_group.cg_item),
		config_item_name(&dev->dev_group.cg_item),
		dev->udev_path);

	return read_bytes;
}

static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "udev_path",
		    .ca_mode =  S_IRUGO | S_IWUSR },
	.show	= target_core_show_dev_udev_path,
	.store	= target_core_store_dev_udev_path,
};

static ssize_t target_core_show_dev_enable(void *p, char *page)
{
	struct se_device *dev = p;

	return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
}

static ssize_t target_core_store_dev_enable(
	void *p,
	const char *page,
	size_t count)
{
	struct se_device *dev = p;
	char *ptr;
	int ret;

	ptr = strstr(page, "1");
	if (!ptr) {
		pr_err("For dev_enable ops, only valid value"
				" is \"1\"\n");
		return -EINVAL;
	}

	ret = target_configure_device(dev);
	if (ret)
		return ret;
	return count;
}

static struct target_core_configfs_attribute target_core_attr_dev_enable = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "enable",
		    .ca_mode =  S_IRUGO | S_IWUSR },
	.show	= target_core_show_dev_enable,
	.store	= target_core_store_dev_enable,
};

static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
{
	struct se_device *dev = p;
	struct config_item *lu_ci;
	struct t10_alua_lu_gp *lu_gp;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	ssize_t len = 0;

	lu_gp_mem = dev->dev_alua_lu_gp_mem;
	if (!lu_gp_mem)
		return 0;

	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
	lu_gp = lu_gp_mem->lu_gp;
	if (lu_gp) {
		lu_ci = &lu_gp->lu_gp_group.cg_item;
		len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
			config_item_name(lu_ci), lu_gp->lu_gp_id);
	}
	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

	return len;
}

static ssize_t target_core_store_alua_lu_gp(
	void *p,
	const char *page,
	size_t count)
{
	struct se_device *dev = p;
	struct se_hba *hba = dev->se_hba;
	struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	unsigned char buf[LU_GROUP_NAME_BUF];
	int move = 0;

	lu_gp_mem = dev->dev_alua_lu_gp_mem;
	if (!lu_gp_mem)
		return 0;

	if (count > LU_GROUP_NAME_BUF) {
		pr_err("ALUA LU Group Alias too large!\n");
		return -EINVAL;
	}
	memset(buf, 0, LU_GROUP_NAME_BUF);
	memcpy(buf, page, count);
	/*
	 * Any ALUA logical unit alias besides "NULL" means we will be
	 * making a new group association.
	 */
	if (strcmp(strstrip(buf), "NULL")) {
		/*
		 * core_alua_get_lu_gp_by_name() will increment reference to
		 * struct t10_alua_lu_gp.  This reference is released with
		 * core_alua_get_lu_gp_by_name below().
		 */
		lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
		if (!lu_gp_new)
			return -ENODEV;
	}

	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
	lu_gp = lu_gp_mem->lu_gp;
	if (lu_gp) {
		/*
		 * Clearing an existing lu_gp association, and replacing
		 * with NULL
		 */
		if (!lu_gp_new) {
			pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
				" from ALUA LU Group: core/alua/lu_gps/%s, ID:"
				" %hu\n",
				config_item_name(&hba->hba_group.cg_item),
				config_item_name(&dev->dev_group.cg_item),
				config_item_name(&lu_gp->lu_gp_group.cg_item),
				lu_gp->lu_gp_id);

			__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

			return count;
		}
		/*
		 * Removing existing association of lu_gp_mem with lu_gp
		 */
		__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
		move = 1;
	}
	/*
	 * Associate lu_gp_mem with lu_gp_new.
	 */
	__core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

	pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
		" core/alua/lu_gps/%s, ID: %hu\n",
		(move) ? "Moving" : "Adding",
		config_item_name(&hba->hba_group.cg_item),
		config_item_name(&dev->dev_group.cg_item),
		config_item_name(&lu_gp_new->lu_gp_group.cg_item),
		lu_gp_new->lu_gp_id);

	core_alua_put_lu_gp_from_name(lu_gp_new);
	return count;
}

static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
	.attr	= { .ca_owner = THIS_MODULE,
		    .ca_name = "alua_lu_gp",
		    .ca_mode = S_IRUGO | S_IWUSR },
	.show	= target_core_show_alua_lu_gp,
	.store	= target_core_store_alua_lu_gp,
};

static struct configfs_attribute *lio_core_dev_attrs[] = {
	&target_core_attr_dev_info.attr,
	&target_core_attr_dev_control.attr,
	&target_core_attr_dev_alias.attr,
	&target_core_attr_dev_udev_path.attr,
	&target_core_attr_dev_enable.attr,
	&target_core_attr_dev_alua_lu_gp.attr,
	NULL,
};

static void target_core_dev_release(struct config_item *item)
{
	struct config_group *dev_cg = to_config_group(item);
	struct se_device *dev =
		container_of(dev_cg, struct se_device, dev_group);

	kfree(dev_cg->default_groups);
	target_free_device(dev);
}

static ssize_t target_core_dev_show(struct config_item *item,
				     struct configfs_attribute *attr,
				     char *page)
{
	struct config_group *dev_cg = to_config_group(item);
	struct se_device *dev =
		container_of(dev_cg, struct se_device, dev_group);
	struct target_core_configfs_attribute *tc_attr = container_of(
			attr, struct target_core_configfs_attribute, attr);

	if (!tc_attr->show)
		return -EINVAL;

	return tc_attr->show(dev, page);
}

static ssize_t target_core_dev_store(struct config_item *item,
				      struct configfs_attribute *attr,
				      const char *page, size_t count)
{
	struct config_group *dev_cg = to_config_group(item);
	struct se_device *dev =
		container_of(dev_cg, struct se_device, dev_group);
	struct target_core_configfs_attribute *tc_attr = container_of(
			attr, struct target_core_configfs_attribute, attr);

	if (!tc_attr->store)
		return -EINVAL;

	return tc_attr->store(dev, page, count);
}

static struct configfs_item_operations target_core_dev_item_ops = {
	.release		= target_core_dev_release,
	.show_attribute		= target_core_dev_show,
	.store_attribute	= target_core_dev_store,
};

static struct config_item_type target_core_dev_cit = {
	.ct_item_ops		= &target_core_dev_item_ops,
	.ct_attrs		= lio_core_dev_attrs,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_dev_cit */

/* Start functions for struct config_item_type target_core_alua_lu_gp_cit */

CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
#define SE_DEV_ALUA_LU_ATTR(_name, _mode)				\
static struct target_core_alua_lu_gp_attribute				\
			target_core_alua_lu_gp_##_name =		\
	__CONFIGFS_EATTR(_name, _mode,					\
	target_core_alua_lu_gp_show_attr_##_name,			\
	target_core_alua_lu_gp_store_attr_##_name);

#define SE_DEV_ALUA_LU_ATTR_RO(_name)					\
static struct target_core_alua_lu_gp_attribute				\
			target_core_alua_lu_gp_##_name =		\
	__CONFIGFS_EATTR_RO(_name,					\
	target_core_alua_lu_gp_show_attr_##_name);

/*
 * lu_gp_id
 */
static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
	struct t10_alua_lu_gp *lu_gp,
	char *page)
{
	if (!lu_gp->lu_gp_valid_id)
		return 0;

	return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
}

static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
	struct t10_alua_lu_gp *lu_gp,
	const char *page,
	size_t count)
{
	struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
	unsigned long lu_gp_id;
	int ret;

	ret = kstrtoul(page, 0, &lu_gp_id);
	if (ret < 0) {
		pr_err("kstrtoul() returned %d for"
			" lu_gp_id\n", ret);
		return ret;
	}
	if (lu_gp_id > 0x0000ffff) {
		pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
			" 0x0000ffff\n", lu_gp_id);
		return -EINVAL;
	}

	ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
	if (ret < 0)
		return -EINVAL;

	pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
		" Group: core/alua/lu_gps/%s to ID: %hu\n",
		config_item_name(&alua_lu_gp_cg->cg_item),
		lu_gp->lu_gp_id);

	return count;
}

SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);

/*
 * members
 */
static ssize_t target_core_alua_lu_gp_show_attr_members(
	struct t10_alua_lu_gp *lu_gp,
	char *page)
{
	struct se_device *dev;
	struct se_hba *hba;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	ssize_t len = 0, cur_len;
	unsigned char buf[LU_GROUP_NAME_BUF];

	memset(buf, 0, LU_GROUP_NAME_BUF);

	spin_lock(&lu_gp->lu_gp_lock);
	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
		dev = lu_gp_mem->lu_gp_mem_dev;
		hba = dev->se_hba;

		cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
			config_item_name(&hba->hba_group.cg_item),
			config_item_name(&dev->dev_group.cg_item));
		cur_len++; /* Extra byte for NULL terminator */

		if ((cur_len + len) > PAGE_SIZE) {
			pr_warn("Ran out of lu_gp_show_attr"
				"_members buffer\n");
			break;
		}
		memcpy(page+len, buf, cur_len);
		len += cur_len;
	}
	spin_unlock(&lu_gp->lu_gp_lock);

	return len;
}

SE_DEV_ALUA_LU_ATTR_RO(members);

CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);

static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
	&target_core_alua_lu_gp_lu_gp_id.attr,
	&target_core_alua_lu_gp_members.attr,
	NULL,
};

static void target_core_alua_lu_gp_release(struct config_item *item)
{
	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
			struct t10_alua_lu_gp, lu_gp_group);

	core_alua_free_lu_gp(lu_gp);
}

static struct configfs_item_operations target_core_alua_lu_gp_ops = {
	.release		= target_core_alua_lu_gp_release,
	.show_attribute		= target_core_alua_lu_gp_attr_show,
	.store_attribute	= target_core_alua_lu_gp_attr_store,
};

static struct config_item_type target_core_alua_lu_gp_cit = {
	.ct_item_ops		= &target_core_alua_lu_gp_ops,
	.ct_attrs		= target_core_alua_lu_gp_attrs,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_alua_lu_gp_cit */

/* Start functions for struct config_item_type target_core_alua_lu_gps_cit */

static struct config_group *target_core_alua_create_lu_gp(
	struct config_group *group,
	const char *name)
{
	struct t10_alua_lu_gp *lu_gp;
	struct config_group *alua_lu_gp_cg = NULL;
	struct config_item *alua_lu_gp_ci = NULL;

	lu_gp = core_alua_allocate_lu_gp(name, 0);
	if (IS_ERR(lu_gp))
		return NULL;

	alua_lu_gp_cg = &lu_gp->lu_gp_group;
	alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;

	config_group_init_type_name(alua_lu_gp_cg, name,
			&target_core_alua_lu_gp_cit);

	pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
		" Group: core/alua/lu_gps/%s\n",
		config_item_name(alua_lu_gp_ci));

	return alua_lu_gp_cg;

}

static void target_core_alua_drop_lu_gp(
	struct config_group *group,
	struct config_item *item)
{
	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
			struct t10_alua_lu_gp, lu_gp_group);

	pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
		" Group: core/alua/lu_gps/%s, ID: %hu\n",
		config_item_name(item), lu_gp->lu_gp_id);
	/*
	 * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
	 * -> target_core_alua_lu_gp_release()
	 */
	config_item_put(item);
}

static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
	.make_group		= &target_core_alua_create_lu_gp,
	.drop_item		= &target_core_alua_drop_lu_gp,
};

static struct config_item_type target_core_alua_lu_gps_cit = {
	.ct_item_ops		= NULL,
	.ct_group_ops		= &target_core_alua_lu_gps_group_ops,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_alua_lu_gps_cit */

/* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */

CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
#define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)				\
static struct target_core_alua_tg_pt_gp_attribute			\
			target_core_alua_tg_pt_gp_##_name =		\
	__CONFIGFS_EATTR(_name, _mode,					\
	target_core_alua_tg_pt_gp_show_attr_##_name,			\
	target_core_alua_tg_pt_gp_store_attr_##_name);

#define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)				\
static struct target_core_alua_tg_pt_gp_attribute			\
			target_core_alua_tg_pt_gp_##_name =		\
	__CONFIGFS_EATTR_RO(_name,					\
	target_core_alua_tg_pt_gp_show_attr_##_name);

/*
 * alua_access_state
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%d\n",
		atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
	unsigned long tmp;
	int new_state, ret;

	if (!tg_pt_gp->tg_pt_gp_valid_id) {
		pr_err("Unable to do implicit ALUA on non valid"
			" tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
		return -EINVAL;
	}

	ret = kstrtoul(page, 0, &tmp);
	if (ret < 0) {
		pr_err("Unable to extract new ALUA access state from"
				" %s\n", page);
		return ret;
	}
	new_state = (int)tmp;

	if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
		pr_err("Unable to process implicit configfs ALUA"
			" transition while TPGS_IMPLICIT_ALUA is disabled\n");
		return -EINVAL;
	}

	ret = core_alua_do_port_transition(tg_pt_gp, dev,
					NULL, NULL, new_state, 0);
	return (!ret) ? count : -EINVAL;
}

SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);

/*
 * alua_access_status
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%s\n",
		core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int new_status, ret;

	if (!tg_pt_gp->tg_pt_gp_valid_id) {
		pr_err("Unable to do set ALUA access status on non"
			" valid tg_pt_gp ID: %hu\n",
			tg_pt_gp->tg_pt_gp_valid_id);
		return -EINVAL;
	}

	ret = kstrtoul(page, 0, &tmp);
	if (ret < 0) {
		pr_err("Unable to extract new ALUA access status"
				" from %s\n", page);
		return ret;
	}
	new_status = (int)tmp;

	if ((new_status != ALUA_STATUS_NONE) &&
	    (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
	    (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
		pr_err("Illegal ALUA access status: 0x%02x\n",
				new_status);
		return -EINVAL;
	}

	tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
	return count;
}

SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);

/*
 * alua_access_type
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return core_alua_show_access_type(tg_pt_gp, page);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	return core_alua_store_access_type(tg_pt_gp, page, count);
}

SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);

/*
 * alua_supported_states
 */

#define SE_DEV_ALUA_SUPPORT_STATE_SHOW(_name, _var, _bit)		\
static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_support_##_name( \
	struct t10_alua_tg_pt_gp *t, char *p)				\
{									\
	return sprintf(p, "%d\n", !!(t->_var & _bit));			\
}

#define SE_DEV_ALUA_SUPPORT_STATE_STORE(_name, _var, _bit)		\
static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_support_##_name(\
	struct t10_alua_tg_pt_gp *t, const char *p, size_t c)		\
{									\
	unsigned long tmp;						\
	int ret;							\
									\
	if (!t->tg_pt_gp_valid_id) {					\
		pr_err("Unable to do set ##_name ALUA state on non"	\
		       " valid tg_pt_gp ID: %hu\n",			\
		       t->tg_pt_gp_valid_id);				\
		return -EINVAL;						\
	}								\
									\
	ret = kstrtoul(p, 0, &tmp);					\
	if (ret < 0) {							\
		pr_err("Invalid value '%s', must be '0' or '1'\n", p);	\
		return -EINVAL;						\
	}								\
	if (tmp > 1) {							\
		pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
		return -EINVAL;						\
	}								\
	if (!tmp)							\
		t->_var |= _bit;					\
	else								\
		t->_var &= ~_bit;					\
									\
	return c;							\
}

SE_DEV_ALUA_SUPPORT_STATE_SHOW(transitioning,
			       tg_pt_gp_alua_supported_states, ALUA_T_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(transitioning,
				tg_pt_gp_alua_supported_states, ALUA_T_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_transitioning, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(offline,
			       tg_pt_gp_alua_supported_states, ALUA_O_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(offline,
				tg_pt_gp_alua_supported_states, ALUA_O_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_offline, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(lba_dependent,
			       tg_pt_gp_alua_supported_states, ALUA_LBD_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(lba_dependent,
				tg_pt_gp_alua_supported_states, ALUA_LBD_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_lba_dependent, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(unavailable,
			       tg_pt_gp_alua_supported_states, ALUA_U_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(unavailable,
				tg_pt_gp_alua_supported_states, ALUA_U_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_unavailable, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(standby,
			       tg_pt_gp_alua_supported_states, ALUA_S_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(standby,
				tg_pt_gp_alua_supported_states, ALUA_S_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_standby, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(active_optimized,
			       tg_pt_gp_alua_supported_states, ALUA_AO_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(active_optimized,
				tg_pt_gp_alua_supported_states, ALUA_AO_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_active_optimized, S_IRUGO | S_IWUSR);

SE_DEV_ALUA_SUPPORT_STATE_SHOW(active_nonoptimized,
			       tg_pt_gp_alua_supported_states, ALUA_AN_SUP);
SE_DEV_ALUA_SUPPORT_STATE_STORE(active_nonoptimized,
				tg_pt_gp_alua_supported_states, ALUA_AN_SUP);
SE_DEV_ALUA_TG_PT_ATTR(alua_support_active_nonoptimized, S_IRUGO | S_IWUSR);

/*
 * alua_write_metadata
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

	ret = kstrtoul(page, 0, &tmp);
	if (ret < 0) {
		pr_err("Unable to extract alua_write_metadata\n");
		return ret;
	}

	if ((tmp != 0) && (tmp != 1)) {
		pr_err("Illegal value for alua_write_metadata:"
			" %lu\n", tmp);
		return -EINVAL;
	}
	tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;

	return count;
}

SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);


/*
 * nonop_delay_msecs
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);

}

static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
}

SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);

/*
 * trans_delay_msecs
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
}

SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);

/*
 * implicit_trans_secs
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_implicit_trans_secs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return core_alua_show_implicit_trans_secs(tg_pt_gp, page);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_implicit_trans_secs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	return core_alua_store_implicit_trans_secs(tg_pt_gp, page, count);
}

SE_DEV_ALUA_TG_PT_ATTR(implicit_trans_secs, S_IRUGO | S_IWUSR);

/*
 * preferred
 */

static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return core_alua_show_preferred_bit(tg_pt_gp, page);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	return core_alua_store_preferred_bit(tg_pt_gp, page, count);
}

SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);

/*
 * tg_pt_gp_id
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	if (!tg_pt_gp->tg_pt_gp_valid_id)
		return 0;

	return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
}

static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
	unsigned long tg_pt_gp_id;
	int ret;

	ret = kstrtoul(page, 0, &tg_pt_gp_id);
	if (ret < 0) {
		pr_err("kstrtoul() returned %d for"
			" tg_pt_gp_id\n", ret);
		return ret;
	}
	if (tg_pt_gp_id > 0x0000ffff) {
		pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
			" 0x0000ffff\n", tg_pt_gp_id);
		return -EINVAL;
	}

	ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
	if (ret < 0)
		return -EINVAL;

	pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
		"core/alua/tg_pt_gps/%s to ID: %hu\n",
		config_item_name(&alua_tg_pt_gp_cg->cg_item),
		tg_pt_gp->tg_pt_gp_id);

	return count;
}

SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);

/*
 * members
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	struct se_port *port;
	struct se_portal_group *tpg;
	struct se_lun *lun;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	ssize_t len = 0, cur_len;
	unsigned char buf[TG_PT_GROUP_NAME_BUF];

	memset(buf, 0, TG_PT_GROUP_NAME_BUF);

	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
			tg_pt_gp_mem_list) {
		port = tg_pt_gp_mem->tg_pt;
		tpg = port->sep_tpg;
		lun = port->sep_lun;

		cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
			"/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
			tpg->se_tpg_tfo->tpg_get_wwn(tpg),
			tpg->se_tpg_tfo->tpg_get_tag(tpg),
			config_item_name(&lun->lun_group.cg_item));
		cur_len++; /* Extra byte for NULL terminator */

		if ((cur_len + len) > PAGE_SIZE) {
			pr_warn("Ran out of lu_gp_show_attr"
				"_members buffer\n");
			break;
		}
		memcpy(page+len, buf, cur_len);
		len += cur_len;
	}
	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);

	return len;
}

SE_DEV_ALUA_TG_PT_ATTR_RO(members);

CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
			tg_pt_gp_group);

static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
	&target_core_alua_tg_pt_gp_alua_access_state.attr,
	&target_core_alua_tg_pt_gp_alua_access_status.attr,
	&target_core_alua_tg_pt_gp_alua_access_type.attr,
	&target_core_alua_tg_pt_gp_alua_support_transitioning.attr,
	&target_core_alua_tg_pt_gp_alua_support_offline.attr,
	&target_core_alua_tg_pt_gp_alua_support_lba_dependent.attr,
	&target_core_alua_tg_pt_gp_alua_support_unavailable.attr,
	&target_core_alua_tg_pt_gp_alua_support_standby.attr,
	&target_core_alua_tg_pt_gp_alua_support_active_nonoptimized.attr,
	&target_core_alua_tg_pt_gp_alua_support_active_optimized.attr,
	&target_core_alua_tg_pt_gp_alua_write_metadata.attr,
	&target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
	&target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
	&target_core_alua_tg_pt_gp_implicit_trans_secs.attr,
	&target_core_alua_tg_pt_gp_preferred.attr,
	&target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
	&target_core_alua_tg_pt_gp_members.attr,
	NULL,
};

static void target_core_alua_tg_pt_gp_release(struct config_item *item)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
			struct t10_alua_tg_pt_gp, tg_pt_gp_group);

	core_alua_free_tg_pt_gp(tg_pt_gp);
}

static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
	.release		= target_core_alua_tg_pt_gp_release,
	.show_attribute		= target_core_alua_tg_pt_gp_attr_show,
	.store_attribute	= target_core_alua_tg_pt_gp_attr_store,
};

static struct config_item_type target_core_alua_tg_pt_gp_cit = {
	.ct_item_ops		= &target_core_alua_tg_pt_gp_ops,
	.ct_attrs		= target_core_alua_tg_pt_gp_attrs,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */

/* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */

static struct config_group *target_core_alua_create_tg_pt_gp(
	struct config_group *group,
	const char *name)
{
	struct t10_alua *alua = container_of(group, struct t10_alua,
					alua_tg_pt_gps_group);
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct config_group *alua_tg_pt_gp_cg = NULL;
	struct config_item *alua_tg_pt_gp_ci = NULL;

	tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
	if (!tg_pt_gp)
		return NULL;

	alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
	alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;

	config_group_init_type_name(alua_tg_pt_gp_cg, name,
			&target_core_alua_tg_pt_gp_cit);

	pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
		" Group: alua/tg_pt_gps/%s\n",
		config_item_name(alua_tg_pt_gp_ci));

	return alua_tg_pt_gp_cg;
}

static void target_core_alua_drop_tg_pt_gp(
	struct config_group *group,
	struct config_item *item)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
			struct t10_alua_tg_pt_gp, tg_pt_gp_group);

	pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
		" Group: alua/tg_pt_gps/%s, ID: %hu\n",
		config_item_name(item), tg_pt_gp->tg_pt_gp_id);
	/*
	 * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
	 * -> target_core_alua_tg_pt_gp_release().
	 */
	config_item_put(item);
}

static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
	.make_group		= &target_core_alua_create_tg_pt_gp,
	.drop_item		= &target_core_alua_drop_tg_pt_gp,
};

static struct config_item_type target_core_alua_tg_pt_gps_cit = {
	.ct_group_ops		= &target_core_alua_tg_pt_gps_group_ops,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */

/* Start functions for struct config_item_type target_core_alua_cit */

/*
 * target_core_alua_cit is a ConfigFS group that lives under
 * /sys/kernel/config/target/core/alua.  There are default groups
 * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
 * target_core_alua_cit in target_core_init_configfs() below.
 */
static struct config_item_type target_core_alua_cit = {
	.ct_item_ops		= NULL,
	.ct_attrs		= NULL,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_alua_cit */

/* Start functions for struct config_item_type target_core_stat_cit */

static struct config_group *target_core_stat_mkdir(
	struct config_group *group,
	const char *name)
{
	return ERR_PTR(-ENOSYS);
}

static void target_core_stat_rmdir(
	struct config_group *group,
	struct config_item *item)
{
	return;
}

static struct configfs_group_operations target_core_stat_group_ops = {
	.make_group		= &target_core_stat_mkdir,
	.drop_item		= &target_core_stat_rmdir,
};

static struct config_item_type target_core_stat_cit = {
	.ct_group_ops		= &target_core_stat_group_ops,
	.ct_owner		= THIS_MODULE,
};

/* End functions for struct config_item_type target_core_stat_cit */

/* Start functions for struct config_item_type target_core_hba_cit */

static struct config_group *target_core_make_subdev(
	struct config_group *group,
	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 se_device *dev;
	struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
	struct config_group *dev_stat_grp = NULL;
	int errno = -ENOMEM, ret;

	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)
		goto out_unlock;

	dev_cg = &dev->dev_group;

	dev_cg->default_groups = kmalloc(sizeof(struct config_group *) * 6,
			GFP_KERNEL);
	if (!dev_cg->default_groups)
		goto out_free_device;

	config_group_init_type_name(dev_cg, name, &target_core_dev_cit);
	config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
			&target_core_dev_attrib_cit);
	config_group_init_type_name(&dev->dev_pr_group, "pr",
			&target_core_dev_pr_cit);
	config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
			&target_core_dev_wwn_cit);
	config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
			"alua", &target_core_alua_tg_pt_gps_cit);
	config_group_init_type_name(&dev->dev_stat_grps.stat_group,
			"statistics", &target_core_stat_cit);

	dev_cg->default_groups[0] = &dev->dev_attrib.da_group;
	dev_cg->default_groups[1] = &dev->dev_pr_group;
	dev_cg->default_groups[2] = &dev->t10_wwn.t10_wwn_group;
	dev_cg->default_groups[3] = &dev->t10_alua.alua_tg_pt_gps_group;
	dev_cg->default_groups[4] = &dev->dev_stat_grps.stat_group;
	dev_cg->default_groups[5] = NULL;
	/*
	 * Add core/$HBA/$DEV/alua/default_tg_pt_gp
	 */
	tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
	if (!tg_pt_gp)
		goto out_free_dev_cg_default_groups;
	dev->t10_alua.default_tg_pt_gp = tg_pt_gp;

	tg_pt_gp_cg = &dev->t10_alua.alua_tg_pt_gps_group;
	tg_pt_gp_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
				GFP_KERNEL);
	if (!tg_pt_gp_cg->default_groups) {
		pr_err("Unable to allocate tg_pt_gp_cg->"
				"default_groups\n");
		goto out_free_tg_pt_gp;
	}

	config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
			"default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
	tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
	tg_pt_gp_cg->default_groups[1] = NULL;
	/*
	 * Add core/$HBA/$DEV/statistics/ default groups
	 */
	dev_stat_grp = &dev->dev_stat_grps.stat_group;
	dev_stat_grp->default_groups = kmalloc(sizeof(struct config_group *) * 4,
				GFP_KERNEL);
	if (!dev_stat_grp->default_groups) {
		pr_err("Unable to allocate dev_stat_grp->default_groups\n");
		goto out_free_tg_pt_gp_cg_default_groups;
	}
	target_stat_setup_dev_default_groups(dev);

	mutex_unlock(&hba->hba_access_mutex);
	return dev_cg;

out_free_tg_pt_gp_cg_default_groups:
	kfree(tg_pt_gp_cg->default_groups);
out_free_tg_pt_gp:
	core_alua_free_tg_pt_gp(tg_pt_gp);
out_free_dev_cg_default_groups:
	kfree(dev_cg->default_groups);
out_free_device:
	target_free_device(dev);
out_unlock:
	mutex_unlock(&hba->hba_access_mutex);
	return ERR_PTR(errno);
}

static void target_core_drop_subdev(
	struct config_group *group,
	struct config_item *item)
{
	struct config_group *dev_cg = to_config_group(item);
	struct se_device *dev =
		container_of(dev_cg, struct se_device, dev_group);
	struct se_hba *hba;
	struct config_item *df_item;
	struct config_group *tg_pt_gp_cg, *dev_stat_grp;
	int i;

	hba = item_to_hba(&dev->se_hba->hba_group.cg_item);

	mutex_lock(&hba->hba_access_mutex);

	dev_stat_grp = &dev->dev_stat_grps.stat_group;
	for (i = 0; dev_stat_grp->default_groups[i]; i++) {
		df_item = &dev_stat_grp->default_groups[i]->cg_item;
		dev_stat_grp->default_groups[i] = NULL;
		config_item_put(df_item);
	}
	kfree(dev_stat_grp->default_groups);

	tg_pt_gp_cg = &dev->t10_alua.alua_tg_pt_gps_group;
	for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
		df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
		tg_pt_gp_cg->default_groups[i] = NULL;
		config_item_put(df_item);
	}
	kfree(tg_pt_gp_cg->default_groups);
	/*
	 * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
	 * directly from target_core_alua_tg_pt_gp_release().
	 */
	dev->t10_alua.default_tg_pt_gp = NULL;

	for (i = 0; dev_cg->default_groups[i]; i++) {
		df_item = &dev_cg->default_groups[i]->cg_item;
		dev_cg->default_groups[i] = NULL;
		config_item_put(df_item);
	}
	/*
	 * se_dev is released from target_core_dev_item_ops->release()
	 */
	config_item_put(item);
	mutex_unlock(&hba->hba_access_mutex);
}

static struct configfs_group_operations target_core_hba_group_ops = {
	.make_group		= target_core_make_subdev,
	.drop_item		= target_core_drop_subdev,
};

CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
#define SE_HBA_ATTR(_name, _mode)				\
static struct target_core_hba_attribute				\
		target_core_hba_##_name =			\
		__CONFIGFS_EATTR(_name, _mode,			\
		target_core_hba_show_attr_##_name,		\
		target_core_hba_store_attr_##_name);

#define SE_HBA_ATTR_RO(_name)					\
static struct target_core_hba_attribute				\
		target_core_hba_##_name =			\
		__CONFIGFS_EATTR_RO(_name,			\
		target_core_hba_show_attr_##_name);

static ssize_t target_core_hba_show_attr_hba_info(
	struct se_hba *hba,
	char *page)
{
	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
			hba->hba_id, hba->transport->name,
			TARGET_CORE_CONFIGFS_VERSION);
}

SE_HBA_ATTR_RO(hba_info);

static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
				char *page)
{
	int hba_mode = 0;

	if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
		hba_mode = 1;

	return sprintf(page, "%d\n", hba_mode);
}

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)
		return -EINVAL;

	ret = kstrtoul(page, 0, &mode_flag);
	if (ret < 0) {
		pr_err("Unable to extract hba mode flag: %d\n", ret);
		return ret;
	}

	if (hba->dev_count) {
		pr_err("Unable to set hba_mode with active devices\n");
		return -EINVAL;
	}

	ret = transport->pmode_enable_hba(hba, mode_flag);
	if (ret < 0)
		return -EINVAL;
	if (ret > 0)
		hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
	else if (ret == 0)
		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;

	return count;
}

SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);

static void target_core_hba_release(struct config_item *item)
{
	struct se_hba *hba = container_of(to_config_group(item),
				struct se_hba, hba_group);
	core_delete_hba(hba);
}

static struct configfs_attribute *target_core_hba_attrs[] = {
	&target_core_hba_hba_info.attr,
	&target_core_hba_hba_mode.attr,
	NULL,
};

static struct configfs_item_operations target_core_hba_item_ops = {
	.release		= target_core_hba_release,
	.show_attribute		= target_core_hba_attr_show,
	.store_attribute	= target_core_hba_attr_store,
};

static struct config_item_type target_core_hba_cit = {
	.ct_item_ops		= &target_core_hba_item_ops,
	.ct_group_ops		= &target_core_hba_group_ops,
	.ct_attrs		= target_core_hba_attrs,
	.ct_owner		= THIS_MODULE,
};

static struct config_group *target_core_call_addhbatotarget(
	struct config_group *group,
	const char *name)
{
	char *se_plugin_str, *str, *str2;
	struct se_hba *hba;
	char buf[TARGET_CORE_NAME_MAX_LEN];
	unsigned long plugin_dep_id = 0;
	int ret;

	memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
	if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
		pr_err("Passed *name strlen(): %d exceeds"
			" TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
			TARGET_CORE_NAME_MAX_LEN);
		return ERR_PTR(-ENAMETOOLONG);
	}
	snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);

	str = strstr(buf, "_");
	if (!str) {
		pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
		return ERR_PTR(-EINVAL);
	}
	se_plugin_str = buf;
	/*
	 * Special case for subsystem plugins that have "_" in their names.
	 * Namely rd_direct and rd_mcp..
	 */
	str2 = strstr(str+1, "_");
	if (str2) {
		*str2 = '\0'; /* Terminate for *se_plugin_str */
		str2++; /* Skip to start of plugin dependent ID */
		str = str2;
	} else {
		*str = '\0'; /* Terminate for *se_plugin_str */
		str++; /* Skip to start of plugin dependent ID */
	}

	ret = kstrtoul(str, 0, &plugin_dep_id);
	if (ret < 0) {
		pr_err("kstrtoul() returned %d for"
				" plugin_dep_id\n", ret);
		return ERR_PTR(ret);
	}
	/*
	 * Load up TCM subsystem plugins if they have not already been loaded.
	 */
	transport_subsystem_check_init();

	hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
	if (IS_ERR(hba))
		return ERR_CAST(hba);

	config_group_init_type_name(&hba->hba_group, name,
			&target_core_hba_cit);

	return &hba->hba_group;
}

static void target_core_call_delhbafromtarget(
	struct config_group *group,
	struct config_item *item)
{
	/*
	 * core_delete_hba() is called from target_core_hba_item_ops->release()
	 * -> target_core_hba_release()
	 */
	config_item_put(item);
}

static struct configfs_group_operations target_core_group_ops = {
	.make_group	= target_core_call_addhbatotarget,
	.drop_item	= target_core_call_delhbafromtarget,
};

static struct config_item_type target_core_cit = {
	.ct_item_ops	= NULL,
	.ct_group_ops	= &target_core_group_ops,
	.ct_attrs	= NULL,
	.ct_owner	= THIS_MODULE,
};

/* Stop functions for struct config_item_type target_core_hba_cit */

static int __init target_core_init_configfs(void)
{
	struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
	struct config_group *lu_gp_cg = NULL;
	struct configfs_subsystem *subsys;
	struct t10_alua_lu_gp *lu_gp;
	int ret;

	pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
		" Engine: %s on %s/%s on "UTS_RELEASE"\n",
		TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);

	subsys = target_core_subsystem[0];
	config_group_init(&subsys->su_group);
	mutex_init(&subsys->su_mutex);

	ret = init_se_kmem_caches();
	if (ret < 0)
		return ret;
	/*
	 * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
	 * and ALUA Logical Unit Group and Target Port Group infrastructure.
	 */
	target_cg = &subsys->su_group;
	target_cg->default_groups = kmalloc(sizeof(struct config_group) * 2,
				GFP_KERNEL);
	if (!target_cg->default_groups) {
		pr_err("Unable to allocate target_cg->default_groups\n");
		ret = -ENOMEM;
		goto out_global;
	}

	config_group_init_type_name(&target_core_hbagroup,
			"core", &target_core_cit);
	target_cg->default_groups[0] = &target_core_hbagroup;
	target_cg->default_groups[1] = NULL;
	/*
	 * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
	 */
	hba_cg = &target_core_hbagroup;
	hba_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
				GFP_KERNEL);
	if (!hba_cg->default_groups) {
		pr_err("Unable to allocate hba_cg->default_groups\n");
		ret = -ENOMEM;
		goto out_global;
	}
	config_group_init_type_name(&alua_group,
			"alua", &target_core_alua_cit);
	hba_cg->default_groups[0] = &alua_group;
	hba_cg->default_groups[1] = NULL;
	/*
	 * Add ALUA Logical Unit Group and Target Port Group ConfigFS
	 * groups under /sys/kernel/config/target/core/alua/
	 */
	alua_cg = &alua_group;
	alua_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
			GFP_KERNEL);
	if (!alua_cg->default_groups) {
		pr_err("Unable to allocate alua_cg->default_groups\n");
		ret = -ENOMEM;
		goto out_global;
	}

	config_group_init_type_name(&alua_lu_gps_group,
			"lu_gps", &target_core_alua_lu_gps_cit);
	alua_cg->default_groups[0] = &alua_lu_gps_group;
	alua_cg->default_groups[1] = NULL;
	/*
	 * Add core/alua/lu_gps/default_lu_gp
	 */
	lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
	if (IS_ERR(lu_gp)) {
		ret = -ENOMEM;
		goto out_global;
	}

	lu_gp_cg = &alua_lu_gps_group;
	lu_gp_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
			GFP_KERNEL);
	if (!lu_gp_cg->default_groups) {
		pr_err("Unable to allocate lu_gp_cg->default_groups\n");
		ret = -ENOMEM;
		goto out_global;
	}

	config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
				&target_core_alua_lu_gp_cit);
	lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
	lu_gp_cg->default_groups[1] = NULL;
	default_lu_gp = lu_gp;
	/*
	 * Register the target_core_mod subsystem with configfs.
	 */
	ret = configfs_register_subsystem(subsys);
	if (ret < 0) {
		pr_err("Error %d while registering subsystem %s\n",
			ret, subsys->su_group.cg_item.ci_namebuf);
		goto out_global;
	}
	pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
		" Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
		" on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
	/*
	 * Register built-in RAMDISK subsystem logic for virtual LUN 0
	 */
	ret = rd_module_init();
	if (ret < 0)
		goto out;

	ret = core_dev_setup_virtual_lun0();
	if (ret < 0)
		goto out;

	ret = target_xcopy_setup_pt();
	if (ret < 0)
		goto out;

	return 0;

out:
	configfs_unregister_subsystem(subsys);
	core_dev_release_virtual_lun0();
	rd_module_exit();
out_global:
	if (default_lu_gp) {
		core_alua_free_lu_gp(default_lu_gp);
		default_lu_gp = NULL;
	}
	if (lu_gp_cg)
		kfree(lu_gp_cg->default_groups);
	if (alua_cg)
		kfree(alua_cg->default_groups);
	if (hba_cg)
		kfree(hba_cg->default_groups);
	kfree(target_cg->default_groups);
	release_se_kmem_caches();
	return ret;
}

static void __exit target_core_exit_configfs(void)
{
	struct configfs_subsystem *subsys;
	struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
	struct config_item *item;
	int i;

	subsys = target_core_subsystem[0];

	lu_gp_cg = &alua_lu_gps_group;
	for (i = 0; lu_gp_cg->default_groups[i]; i++) {
		item = &lu_gp_cg->default_groups[i]->cg_item;
		lu_gp_cg->default_groups[i] = NULL;
		config_item_put(item);
	}
	kfree(lu_gp_cg->default_groups);
	lu_gp_cg->default_groups = NULL;

	alua_cg = &alua_group;
	for (i = 0; alua_cg->default_groups[i]; i++) {
		item = &alua_cg->default_groups[i]->cg_item;
		alua_cg->default_groups[i] = NULL;
		config_item_put(item);
	}
	kfree(alua_cg->default_groups);
	alua_cg->default_groups = NULL;

	hba_cg = &target_core_hbagroup;
	for (i = 0; hba_cg->default_groups[i]; i++) {
		item = &hba_cg->default_groups[i]->cg_item;
		hba_cg->default_groups[i] = NULL;
		config_item_put(item);
	}
	kfree(hba_cg->default_groups);
	hba_cg->default_groups = NULL;
	/*
	 * We expect subsys->su_group.default_groups to be released
	 * by configfs subsystem provider logic..
	 */
	configfs_unregister_subsystem(subsys);
	kfree(subsys->su_group.default_groups);

	core_alua_free_lu_gp(default_lu_gp);
	default_lu_gp = NULL;

	pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
			" Infrastructure\n");

	core_dev_release_virtual_lun0();
	rd_module_exit();
	target_xcopy_release_pt();
	release_se_kmem_caches();
}

MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");

module_init(target_core_init_configfs);
module_exit(target_core_exit_configfs);