// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
 * 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.
 *
 ****************************************************************************/

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

#define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
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 = _attrs;                                         \
        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));             \
}

extern struct t10_alua_lu_gp *default_lu_gp;

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

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_item_version_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
                " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
                utsname()->sysname, utsname()->machine);
}

CONFIGFS_ATTR_RO(target_core_item_, version);

char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
static char db_root_stage[DB_ROOT_LEN];

static ssize_t target_core_item_dbroot_show(struct config_item *item,
                                            char *page)
{
        return sprintf(page, "%s\n", db_root);
}

static ssize_t target_core_item_dbroot_store(struct config_item *item,
                                        const char *page, size_t count)
{
        ssize_t read_bytes;
        struct file *fp;

        mutex_lock(&g_tf_lock);
        if (!list_empty(&g_tf_list)) {
                mutex_unlock(&g_tf_lock);
                pr_err("db_root: cannot be changed: target drivers registered");
                return -EINVAL;
        }

        if (count > (DB_ROOT_LEN - 1)) {
                mutex_unlock(&g_tf_lock);
                pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
                       (int)count, DB_ROOT_LEN - 1);
                return -EINVAL;
        }

        read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
        if (!read_bytes) {
                mutex_unlock(&g_tf_lock);
                return -EINVAL;
        }
        if (db_root_stage[read_bytes - 1] == '\n')
                db_root_stage[read_bytes - 1] = '\0';

        /* validate new db root before accepting it */
        fp = filp_open(db_root_stage, O_RDONLY, 0);
        if (IS_ERR(fp)) {
                mutex_unlock(&g_tf_lock);
                pr_err("db_root: cannot open: %s\n", db_root_stage);
                return -EINVAL;
        }
        if (!S_ISDIR(file_inode(fp)->i_mode)) {
                filp_close(fp, NULL);
                mutex_unlock(&g_tf_lock);
                pr_err("db_root: not a directory: %s\n", db_root_stage);
                return -EINVAL;
        }
        filp_close(fp, NULL);

        strncpy(db_root, db_root_stage, read_bytes);

        mutex_unlock(&g_tf_lock);

        pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);

        return read_bytes;
}

CONFIGFS_ATTR(target_core_item_, dbroot);

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) {
                const char *cmp_name = tf->tf_ops->fabric_alias;
                if (!cmp_name)
                        cmp_name = tf->tf_ops->fabric_name;
                if (!strcmp(cmp_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);

        tf = target_core_get_fabric(name);
        if (!tf) {
                pr_debug("target_core_register_fabric() trying autoload for %s\n",
                         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_debug("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_debug("request_module() failed for"
                                         " tcm_loop.ko: %d\n", ret);
                                return ERR_PTR(-EINVAL);
                        }
                }

                tf = target_core_get_fabric(name);
        }

        if (!tf) {
                pr_debug("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_ops->fabric_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_wwn_cit);

        config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);

        config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
                        &tf->tf_discovery_cit);
        configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);

        pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric: %s\n",
                 config_item_name(&tf->tf_group.cg_item));
        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);

        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_ops->fabric_name);
        atomic_dec(&tf->tf_access_cnt);

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

        configfs_remove_default_groups(&tf->tf_group);
        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,
        &target_core_item_attr_dbroot,
        NULL,
};

/*
 * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 */
static const struct config_item_type target_core_fabrics_item = {
        .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,
                },
        },
};

int target_depend_item(struct config_item *item)
{
        return configfs_depend_item(&target_core_fabrics, item);
}
EXPORT_SYMBOL(target_depend_item);

void target_undepend_item(struct config_item *item)
{
        return configfs_undepend_item(item);
}
EXPORT_SYMBOL(target_undepend_item);

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

static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
{
        if (tfo->fabric_alias) {
                if (strlen(tfo->fabric_alias) >= TARGET_FABRIC_NAME_SIZE) {
                        pr_err("Passed alias: %s exceeds "
                                "TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_alias);
                        return -EINVAL;
                }
        }
        if (!tfo->fabric_name) {
                pr_err("Missing tfo->fabric_name\n");
                return -EINVAL;
        }
        if (strlen(tfo->fabric_name) >= TARGET_FABRIC_NAME_SIZE) {
                pr_err("Passed name: %s exceeds "
                        "TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_name);
                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_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_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->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->set_default_node_attributes) {
                pr_err("Missing tfo->set_default_node_attributes()\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;
        }
        if (!tfo->aborted_task) {
                pr_err("Missing tfo->aborted_task()\n");
                return -EINVAL;
        }
        if (!tfo->check_stop_free) {
                pr_err("Missing tfo->check_stop_free()\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;
}

int target_register_template(const struct target_core_fabric_ops *fo)
{
        struct target_fabric_configfs *tf;
        int ret;

        ret = target_fabric_tf_ops_check(fo);
        if (ret)
                return ret;

        tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
        if (!tf) {
                pr_err("%s: could not allocate memory!\n", __func__);
                return -ENOMEM;
        }

        INIT_LIST_HEAD(&tf->tf_list);
        atomic_set(&tf->tf_access_cnt, 0);
        tf->tf_ops = fo;
        target_fabric_setup_cits(tf);

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

        return 0;
}
EXPORT_SYMBOL(target_register_template);

void target_unregister_template(const struct target_core_fabric_ops *fo)
{
        struct target_fabric_configfs *t;

        mutex_lock(&g_tf_lock);
        list_for_each_entry(t, &g_tf_list, tf_list) {
                if (!strcmp(t->tf_ops->fabric_name, fo->fabric_name)) {
                        BUG_ON(atomic_read(&t->tf_access_cnt));
                        list_del(&t->tf_list);
                        mutex_unlock(&g_tf_lock);
                        /*
                         * Wait for any outstanding fabric se_deve_entry->rcu_head
                         * callbacks to complete post kfree_rcu(), before allowing
                         * fabric driver unload of TFO->module to proceed.
                         */
                        rcu_barrier();
                        kfree(t);
                        return;
                }
        }
        mutex_unlock(&g_tf_lock);
}
EXPORT_SYMBOL(target_unregister_template);

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

static inline struct se_dev_attrib *to_attrib(struct config_item *item)
{
        return container_of(to_config_group(item), struct se_dev_attrib,
                        da_group);
}

/* Start functions for struct config_item_type tb_dev_attrib_cit */
#define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
static ssize_t _name##_show(struct config_item *item, char *page)       \
{                                                                       \
        return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
}

DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_pr);
DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
DEF_CONFIGFS_ATTRIB_SHOW(block_size);
DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);

#define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
static ssize_t _name##_store(struct config_item *item, const char *page,\
                size_t count)                                           \
{                                                                       \
        struct se_dev_attrib *da = to_attrib(item);                     \
        u32 val;                                                        \
        int ret;                                                        \
                                                                        \
        ret = kstrtou32(page, 0, &val);                                 \
        if (ret < 0)                                                    \
                return ret;                                             \
        da->_name = val;                                                \
        return count;                                                   \
}

DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);

#define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
static ssize_t _name##_store(struct config_item *item, const char *page,        \
                size_t count)                                           \
{                                                                       \
        struct se_dev_attrib *da = to_attrib(item);                     \
        bool flag;                                                      \
        int ret;                                                        \
                                                                        \
        ret = strtobool(page, &flag);                                   \
        if (ret < 0)                                                    \
                return ret;                                             \
        da->_name = flag;                                               \
        return count;                                                   \
}

DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_pr);
DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);

#define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
static ssize_t _name##_store(struct config_item *item, const char *page,\
                size_t count)                                           \
{                                                                       \
        printk_once(KERN_WARNING                                        \
                "ignoring deprecated %s attribute\n",                   \
                __stringify(_name));                                    \
        return count;                                                   \
}

DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);

static void dev_set_t10_wwn_model_alias(struct se_device *dev)
{
        const char *configname;

        configname = config_item_name(&dev->dev_group.cg_item);
        if (strlen(configname) >= INQUIRY_MODEL_LEN) {
                pr_warn("dev[%p]: Backstore name '%s' is too long for "
                        "INQUIRY_MODEL, truncating to 15 characters\n", dev,
                        configname);
        }
        /*
         * XXX We can't use sizeof(dev->t10_wwn.model) (INQUIRY_MODEL_LEN + 1)
         * here without potentially breaking existing setups, so continue to
         * truncate one byte shorter than what can be carried in INQUIRY.
         */
        strlcpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
}

static ssize_t emulate_model_alias_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        struct se_device *dev = da->da_dev;
        bool flag;
        int ret;

        if (dev->export_count) {
                pr_err("dev[%p]: Unable to change model alias"
                        " while export_count is %d\n",
                        dev, dev->export_count);
                return -EINVAL;
        }

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
        if (flag) {
                dev_set_t10_wwn_model_alias(dev);
        } else {
                strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
                        sizeof(dev->t10_wwn.model));
        }
        da->emulate_model_alias = flag;
        return count;
}

static ssize_t emulate_write_cache_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (flag && da->da_dev->transport->get_write_cache) {
                pr_err("emulate_write_cache not supported for this device\n");
                return -EINVAL;
        }

        da->emulate_write_cache = flag;
        pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
                        da->da_dev, flag);
        return count;
}

static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        u32 val;
        int ret;

        ret = kstrtou32(page, 0, &val);
        if (ret < 0)
                return ret;

        if (val != 0 && val != 1 && val != 2) {
                pr_err("Illegal value %d\n", val);
                return -EINVAL;
        }

        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device"
                        " UA_INTRLCK_CTRL while export_count is %d\n",
                        da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }
        da->emulate_ua_intlck_ctrl = val;
        pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
                da->da_dev, val);
        return count;
}

static ssize_t emulate_tas_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device TAS while"
                        " export_count is %d\n",
                        da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }
        da->emulate_tas = flag;
        pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
                da->da_dev, flag ? "Enabled" : "Disabled");

        return count;
}

static ssize_t emulate_tpu_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        /*
         * We expect this value to be non-zero when generic Block Layer
         * Discard supported is detected iblock_create_virtdevice().
         */
        if (flag && !da->max_unmap_block_desc_count) {
                pr_err("Generic Block Discard not supported\n");
                return -ENOSYS;
        }

        da->emulate_tpu = flag;
        pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
                da->da_dev, flag);
        return count;
}

static ssize_t emulate_tpws_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        /*
         * We expect this value to be non-zero when generic Block Layer
         * Discard supported is detected iblock_create_virtdevice().
         */
        if (flag && !da->max_unmap_block_desc_count) {
                pr_err("Generic Block Discard not supported\n");
                return -ENOSYS;
        }

        da->emulate_tpws = flag;
        pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
                                da->da_dev, flag);
        return count;
}

static ssize_t pi_prot_type_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        int old_prot = da->pi_prot_type, ret;
        struct se_device *dev = da->da_dev;
        u32 flag;

        ret = kstrtou32(page, 0, &flag);
        if (ret < 0)
                return ret;

        if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
                pr_err("Illegal value %d for pi_prot_type\n", flag);
                return -EINVAL;
        }
        if (flag == 2) {
                pr_err("DIF TYPE2 protection currently not supported\n");
                return -ENOSYS;
        }
        if (da->hw_pi_prot_type) {
                pr_warn("DIF protection enabled on underlying hardware,"
                        " ignoring\n");
                return count;
        }
        if (!dev->transport->init_prot || !dev->transport->free_prot) {
                /* 0 is only allowed value for non-supporting backends */
                if (flag == 0)
                        return count;

                pr_err("DIF protection not supported by backend: %s\n",
                       dev->transport->name);
                return -ENOSYS;
        }
        if (!target_dev_configured(dev)) {
                pr_err("DIF protection requires device to be configured\n");
                return -ENODEV;
        }
        if (dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device PROT type while"
                       " export_count is %d\n", dev, dev->export_count);
                return -EINVAL;
        }

        da->pi_prot_type = flag;

        if (flag && !old_prot) {
                ret = dev->transport->init_prot(dev);
                if (ret) {
                        da->pi_prot_type = old_prot;
                        da->pi_prot_verify = (bool) da->pi_prot_type;
                        return ret;
                }

        } else if (!flag && old_prot) {
                dev->transport->free_prot(dev);
        }

        da->pi_prot_verify = (bool) da->pi_prot_type;
        pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
        return count;
}

/* always zero, but attr needs to remain RW to avoid userspace breakage */
static ssize_t pi_prot_format_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "0\n");
}

static ssize_t pi_prot_format_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        struct se_device *dev = da->da_dev;
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (!flag)
                return count;

        if (!dev->transport->format_prot) {
                pr_err("DIF protection format not supported by backend %s\n",
                       dev->transport->name);
                return -ENOSYS;
        }
        if (!target_dev_configured(dev)) {
                pr_err("DIF protection format requires device to be configured\n");
                return -ENODEV;
        }
        if (dev->export_count) {
                pr_err("dev[%p]: Unable to format SE Device PROT type while"
                       " export_count is %d\n", dev, dev->export_count);
                return -EINVAL;
        }

        ret = dev->transport->format_prot(dev);
        if (ret)
                return ret;

        pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
        return count;
}

static ssize_t pi_prot_verify_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (!flag) {
                da->pi_prot_verify = flag;
                return count;
        }
        if (da->hw_pi_prot_type) {
                pr_warn("DIF protection enabled on underlying hardware,"
                        " ignoring\n");
                return count;
        }
        if (!da->pi_prot_type) {
                pr_warn("DIF protection not supported by backend, ignoring\n");
                return count;
        }
        da->pi_prot_verify = flag;

        return count;
}

static ssize_t force_pr_aptpl_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;
        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to set force_pr_aptpl while"
                       " export_count is %d\n",
                       da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }

        da->force_pr_aptpl = flag;
        pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
        return count;
}

static ssize_t emulate_rest_reord_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (flag != 0) {
                printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
                        " reordering not implemented\n", da->da_dev);
                return -ENOSYS;
        }
        da->emulate_rest_reord = flag;
        pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
                da->da_dev, flag);
        return count;
}

static ssize_t unmap_zeroes_data_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        bool flag;
        int ret;

        ret = strtobool(page, &flag);
        if (ret < 0)
                return ret;

        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device"
                       " unmap_zeroes_data while export_count is %d\n",
                       da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }
        /*
         * We expect this value to be non-zero when generic Block Layer
         * Discard supported is detected iblock_configure_device().
         */
        if (flag && !da->max_unmap_block_desc_count) {
                pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
                       " because max_unmap_block_desc_count is zero\n",
                       da->da_dev);
                return -ENOSYS;
        }
        da->unmap_zeroes_data = flag;
        pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
                 da->da_dev, flag);
        return count;
}

/*
 * Note, this can only be called on unexported SE Device Object.
 */
static ssize_t queue_depth_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        struct se_device *dev = da->da_dev;

        u32 val;
        int ret;

        ret = kstrtou32(page, 0, &val);
        if (ret < 0)
                return ret;

        if (dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device TCQ while"
                        " export_count is %d\n",
                        dev, dev->export_count);
                return -EINVAL;
        }
        if (!val) {
                pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
                return -EINVAL;
        }

        if (val > dev->dev_attrib.queue_depth) {
                if (val > dev->dev_attrib.hw_queue_depth) {
                        pr_err("dev[%p]: Passed queue_depth:"
                                " %u exceeds TCM/SE_Device MAX"
                                " TCQ: %u\n", dev, val,
                                dev->dev_attrib.hw_queue_depth);
                        return -EINVAL;
                }
        }
        da->queue_depth = dev->queue_depth = val;
        pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
        return count;
}

static ssize_t optimal_sectors_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        u32 val;
        int ret;

        ret = kstrtou32(page, 0, &val);
        if (ret < 0)
                return ret;

        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device"
                        " optimal_sectors while export_count is %d\n",
                        da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }
        if (val > da->hw_max_sectors) {
                pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
                        " greater than hw_max_sectors: %u\n",
                        da->da_dev, val, da->hw_max_sectors);
                return -EINVAL;
        }

        da->optimal_sectors = val;
        pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
                        da->da_dev, val);
        return count;
}

static ssize_t block_size_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_dev_attrib *da = to_attrib(item);
        u32 val;
        int ret;

        ret = kstrtou32(page, 0, &val);
        if (ret < 0)
                return ret;

        if (da->da_dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device block_size"
                        " while export_count is %d\n",
                        da->da_dev, da->da_dev->export_count);
                return -EINVAL;
        }

        if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
                pr_err("dev[%p]: Illegal value for block_device: %u"
                        " for SE device, must be 512, 1024, 2048 or 4096\n",
                        da->da_dev, val);
                return -EINVAL;
        }

        da->block_size = val;
        if (da->max_bytes_per_io)
                da->hw_max_sectors = da->max_bytes_per_io / val;

        pr_debug("dev[%p]: SE Device block_size changed to %u\n",
                        da->da_dev, val);
        return count;
}

static ssize_t alua_support_show(struct config_item *item, char *page)
{
        struct se_dev_attrib *da = to_attrib(item);
        u8 flags = da->da_dev->transport->transport_flags;

        return snprintf(page, PAGE_SIZE, "%d\n",
                        flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
}

static ssize_t pgr_support_show(struct config_item *item, char *page)
{
        struct se_dev_attrib *da = to_attrib(item);
        u8 flags = da->da_dev->transport->transport_flags;

        return snprintf(page, PAGE_SIZE, "%d\n",
                        flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
}

CONFIGFS_ATTR(, emulate_model_alias);
CONFIGFS_ATTR(, emulate_dpo);
CONFIGFS_ATTR(, emulate_fua_write);
CONFIGFS_ATTR(, emulate_fua_read);
CONFIGFS_ATTR(, emulate_write_cache);
CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
CONFIGFS_ATTR(, emulate_tas);
CONFIGFS_ATTR(, emulate_tpu);
CONFIGFS_ATTR(, emulate_tpws);
CONFIGFS_ATTR(, emulate_caw);
CONFIGFS_ATTR(, emulate_3pc);
CONFIGFS_ATTR(, emulate_pr);
CONFIGFS_ATTR(, pi_prot_type);
CONFIGFS_ATTR_RO(, hw_pi_prot_type);
CONFIGFS_ATTR(, pi_prot_format);
CONFIGFS_ATTR(, pi_prot_verify);
CONFIGFS_ATTR(, enforce_pr_isids);
CONFIGFS_ATTR(, is_nonrot);
CONFIGFS_ATTR(, emulate_rest_reord);
CONFIGFS_ATTR(, force_pr_aptpl);
CONFIGFS_ATTR_RO(, hw_block_size);
CONFIGFS_ATTR(, block_size);
CONFIGFS_ATTR_RO(, hw_max_sectors);
CONFIGFS_ATTR(, optimal_sectors);
CONFIGFS_ATTR_RO(, hw_queue_depth);
CONFIGFS_ATTR(, queue_depth);
CONFIGFS_ATTR(, max_unmap_lba_count);
CONFIGFS_ATTR(, max_unmap_block_desc_count);
CONFIGFS_ATTR(, unmap_granularity);
CONFIGFS_ATTR(, unmap_granularity_alignment);
CONFIGFS_ATTR(, unmap_zeroes_data);
CONFIGFS_ATTR(, max_write_same_len);
CONFIGFS_ATTR_RO(, alua_support);
CONFIGFS_ATTR_RO(, pgr_support);

/*
 * dev_attrib attributes for devices using the target core SBC/SPC
 * interpreter.  Any backend using spc_parse_cdb should be using
 * these.
 */
struct configfs_attribute *sbc_attrib_attrs[] = {
        &attr_emulate_model_alias,
        &attr_emulate_dpo,
        &attr_emulate_fua_write,
        &attr_emulate_fua_read,
        &attr_emulate_write_cache,
        &attr_emulate_ua_intlck_ctrl,
        &attr_emulate_tas,
        &attr_emulate_tpu,
        &attr_emulate_tpws,
        &attr_emulate_caw,
        &attr_emulate_3pc,
        &attr_emulate_pr,
        &attr_pi_prot_type,
        &attr_hw_pi_prot_type,
        &attr_pi_prot_format,
        &attr_pi_prot_verify,
        &attr_enforce_pr_isids,
        &attr_is_nonrot,
        &attr_emulate_rest_reord,
        &attr_force_pr_aptpl,
        &attr_hw_block_size,
        &attr_block_size,
        &attr_hw_max_sectors,
        &attr_optimal_sectors,
        &attr_hw_queue_depth,
        &attr_queue_depth,
        &attr_max_unmap_lba_count,
        &attr_max_unmap_block_desc_count,
        &attr_unmap_granularity,
        &attr_unmap_granularity_alignment,
        &attr_unmap_zeroes_data,
        &attr_max_write_same_len,
        &attr_alua_support,
        &attr_pgr_support,
        NULL,
};
EXPORT_SYMBOL(sbc_attrib_attrs);

/*
 * Minimal dev_attrib attributes for devices passing through CDBs.
 * In this case we only provide a few read-only attributes for
 * backwards compatibility.
 */
struct configfs_attribute *passthrough_attrib_attrs[] = {
        &attr_hw_pi_prot_type,
        &attr_hw_block_size,
        &attr_hw_max_sectors,
        &attr_hw_queue_depth,
        &attr_alua_support,
        &attr_pgr_support,
        NULL,
};
EXPORT_SYMBOL(passthrough_attrib_attrs);

TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
TB_CIT_SETUP_DRV(dev_action, NULL, NULL);

/* End functions for struct config_item_type tb_dev_attrib_cit */

/*  Start functions for struct config_item_type tb_dev_wwn_cit */

static struct t10_wwn *to_t10_wwn(struct config_item *item)
{
        return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
}

static ssize_t target_check_inquiry_data(char *buf)
{
        size_t len;
        int i;

        len = strlen(buf);

        /*
         * SPC 4.3.1:
         * ASCII data fields shall contain only ASCII printable characters
         * (i.e., code values 20h to 7Eh) and may be terminated with one or
         * more ASCII null (00h) characters.
         */
        for (i = 0; i < len; i++) {
                if (buf[i] < 0x20 || buf[i] > 0x7E) {
                        pr_err("Emulated T10 Inquiry Data contains non-ASCII-printable characters\n");
                        return -EINVAL;
                }
        }

        return len;
}

/*
 * STANDARD and VPD page 0x83 T10 Vendor Identification
 */
static ssize_t target_wwn_vendor_id_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "%s\n", &to_t10_wwn(item)->vendor[0]);
}

static ssize_t target_wwn_vendor_id_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_wwn *t10_wwn = to_t10_wwn(item);
        struct se_device *dev = t10_wwn->t10_dev;
        /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
        unsigned char buf[INQUIRY_VENDOR_LEN + 2];
        char *stripped = NULL;
        size_t len;
        ssize_t ret;

        len = strlcpy(buf, page, sizeof(buf));
        if (len < sizeof(buf)) {
                /* Strip any newline added from userspace. */
                stripped = strstrip(buf);
                len = strlen(stripped);
        }
        if (len > INQUIRY_VENDOR_LEN) {
                pr_err("Emulated T10 Vendor Identification exceeds"
                        " INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
                        "\n");
                return -EOVERFLOW;
        }

        ret = target_check_inquiry_data(stripped);

        if (ret < 0)
                return ret;

        /*
         * Check to see if any active 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 T10 Vendor Identification while"
                        " active %d exports exist\n", dev->export_count);
                return -EINVAL;
        }

        BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
        strlcpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));

        pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"
                 " %s\n", dev->t10_wwn.vendor);

        return count;
}

static ssize_t target_wwn_product_id_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "%s\n", &to_t10_wwn(item)->model[0]);
}

static ssize_t target_wwn_product_id_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_wwn *t10_wwn = to_t10_wwn(item);
        struct se_device *dev = t10_wwn->t10_dev;
        /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
        unsigned char buf[INQUIRY_MODEL_LEN + 2];
        char *stripped = NULL;
        size_t len;
        ssize_t ret;

        len = strlcpy(buf, page, sizeof(buf));
        if (len < sizeof(buf)) {
                /* Strip any newline added from userspace. */
                stripped = strstrip(buf);
                len = strlen(stripped);
        }
        if (len > INQUIRY_MODEL_LEN) {
                pr_err("Emulated T10 Vendor exceeds INQUIRY_MODEL_LEN: "
                         __stringify(INQUIRY_MODEL_LEN)
                        "\n");
                return -EOVERFLOW;
        }

        ret = target_check_inquiry_data(stripped);

        if (ret < 0)
                return ret;

        /*
         * Check to see if any active 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 T10 Model while active %d exports exist\n",
                        dev->export_count);
                return -EINVAL;
        }

        BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
        strlcpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));

        pr_debug("Target_Core_ConfigFS: Set emulated T10 Model Identification: %s\n",
                 dev->t10_wwn.model);

        return count;
}

static ssize_t target_wwn_revision_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "%s\n", &to_t10_wwn(item)->revision[0]);
}

static ssize_t target_wwn_revision_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_wwn *t10_wwn = to_t10_wwn(item);
        struct se_device *dev = t10_wwn->t10_dev;
        /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
        unsigned char buf[INQUIRY_REVISION_LEN + 2];
        char *stripped = NULL;
        size_t len;
        ssize_t ret;

        len = strlcpy(buf, page, sizeof(buf));
        if (len < sizeof(buf)) {
                /* Strip any newline added from userspace. */
                stripped = strstrip(buf);
                len = strlen(stripped);
        }
        if (len > INQUIRY_REVISION_LEN) {
                pr_err("Emulated T10 Revision exceeds INQUIRY_REVISION_LEN: "
                         __stringify(INQUIRY_REVISION_LEN)
                        "\n");
                return -EOVERFLOW;
        }

        ret = target_check_inquiry_data(stripped);

        if (ret < 0)
                return ret;

        /*
         * Check to see if any active 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 T10 Revision while active %d exports exist\n",
                        dev->export_count);
                return -EINVAL;
        }

        BUILD_BUG_ON(sizeof(dev->t10_wwn.revision) != INQUIRY_REVISION_LEN + 1);
        strlcpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));

        pr_debug("Target_Core_ConfigFS: Set emulated T10 Revision: %s\n",
                 dev->t10_wwn.revision);

        return count;
}

/*
 * VPD page 0x80 Unit serial
 */
static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
                &to_t10_wwn(item)->unit_serial[0]);
}

static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_wwn *t10_wwn = to_t10_wwn(item);
        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;
}

/*
 * VPD page 0x83 Protocol Identifier
 */
static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
                char *page)
{
        struct t10_wwn *t10_wwn = to_t10_wwn(item);
        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;
}

/*
 * Generic wrapper for dumping VPD identifiers by association.
 */
#define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
                char *page)                                             \
{                                                                       \
        struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
        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);
/* VPD page 0x83 Association: Target Port */
DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
/* VPD page 0x83 Association: SCSI Target Device */
DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);

CONFIGFS_ATTR(target_wwn_, vendor_id);
CONFIGFS_ATTR(target_wwn_, product_id);
CONFIGFS_ATTR(target_wwn_, revision);
CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);

static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
        &target_wwn_attr_vendor_id,
        &target_wwn_attr_product_id,
        &target_wwn_attr_revision,
        &target_wwn_attr_vpd_unit_serial,
        &target_wwn_attr_vpd_protocol_identifier,
        &target_wwn_attr_vpd_assoc_logical_unit,
        &target_wwn_attr_vpd_assoc_target_port,
        &target_wwn_attr_vpd_assoc_scsi_target_device,
        NULL,
};

TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);

/*  End functions for struct config_item_type tb_dev_wwn_cit */

/*  Start functions for struct config_item_type tb_dev_pr_cit */

static struct se_device *pr_to_dev(struct config_item *item)
{
        return container_of(to_config_group(item), struct se_device,
                        dev_pr_group);
}

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->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_session *sess = dev->reservation_holder;
        struct se_node_acl *se_nacl;
        ssize_t len;

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

static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
{
        struct se_device *dev = pr_to_dev(item);
        int ret;

        if (!dev->dev_attrib.emulate_pr)
                return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");

        if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
                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;
}

static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = pr_to_dev(item);
        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;
}

static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
}


static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = pr_to_dev(item);
        struct se_node_acl *se_nacl;
        struct se_portal_group *se_tpg;
        struct t10_pr_registration *pr_reg;
        const 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;
        tfo = se_tpg->se_tpg_tfo;

        len += sprintf(page+len, "SPC-3 Reservation: %s"
                " Target Node Endpoint: %s\n", tfo->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: %llu\n", pr_reg->tg_pt_sep_rtpi,
                tfo->fabric_name, tfo->tpg_get_tag(se_tpg),
                tfo->fabric_name, pr_reg->pr_aptpl_target_lun);

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


static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = pr_to_dev(item);
        const 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->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;
}

static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
{
        struct se_device *dev = pr_to_dev(item);
        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;
}

static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
{
        struct se_device *dev = pr_to_dev(item);

        if (!dev->dev_attrib.emulate_pr)
                return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
        if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
                return sprintf(page, "SPC_PASSTHROUGH\n");
        if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
                return sprintf(page, "SPC2_RESERVATIONS\n");

        return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
}

static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = pr_to_dev(item);

        if (!dev->dev_attrib.emulate_pr ||
            (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
                return 0;

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

static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = pr_to_dev(item);

        if (!dev->dev_attrib.emulate_pr ||
            (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
                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=%u"},
        {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=%u"},
        {Opt_err, NULL}
};

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

        if (!dev->dev_attrib.emulate_pr ||
            (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
                return count;
        if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
                return count;

        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);
                        if (!i_fabric) {
                                ret = -ENOMEM;
                                goto out;
                        }
                        break;
                case Opt_initiator_node:
                        i_port = match_strdup(args);
                        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);
                        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:
                        ret = match_u64(args,  &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:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        res_holder = arg;
                        break;
                case Opt_res_type:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        type = (u8)arg;
                        break;
                case Opt_res_scope:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        break;
                case Opt_res_all_tg_pt:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        all_tg_pt = (int)arg;
                        break;
                case Opt_mapped_lun:
                        ret = match_u64(args, &tmp_ll);
                        if (ret)
                                goto out;
                        mapped_lun = (u64)tmp_ll;
                        break;
                /*
                 * PR APTPL Metadata for Target Port
                 */
                case Opt_target_fabric:
                        t_fabric = match_strdup(args);
                        if (!t_fabric) {
                                ret = -ENOMEM;
                                goto out;
                        }
                        break;
                case Opt_target_node:
                        t_port = match_strdup(args);
                        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:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        tpgt = (u16)arg;
                        break;
                case Opt_port_rtpi:
                        ret = match_int(args, &arg);
                        if (ret)
                                goto out;
                        break;
                case Opt_target_lun:
                        ret = match_u64(args, &tmp_ll);
                        if (ret)
                                goto out;
                        target_lun = (u64)tmp_ll;
                        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;
}


CONFIGFS_ATTR_RO(target_pr_, res_holder);
CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
CONFIGFS_ATTR_RO(target_pr_, res_type);
CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);

static struct configfs_attribute *target_core_dev_pr_attrs[] = {
        &target_pr_attr_res_holder,
        &target_pr_attr_res_pr_all_tgt_pts,
        &target_pr_attr_res_pr_generation,
        &target_pr_attr_res_pr_holder_tg_port,
        &target_pr_attr_res_pr_registered_i_pts,
        &target_pr_attr_res_pr_type,
        &target_pr_attr_res_type,
        &target_pr_attr_res_aptpl_active,
        &target_pr_attr_res_aptpl_metadata,
        NULL,
};

TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);

/*  End functions for struct config_item_type tb_dev_pr_cit */

/*  Start functions for struct config_item_type tb_dev_cit */

static inline struct se_device *to_device(struct config_item *item)
{
        return container_of(to_config_group(item), struct se_device, dev_group);
}

static ssize_t target_dev_info_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);
        int bl = 0;
        ssize_t read_bytes = 0;

        transport_dump_dev_state(dev, page, &bl);
        read_bytes += bl;
        read_bytes += dev->transport->show_configfs_dev_params(dev,
                        page+read_bytes);
        return read_bytes;
}

static ssize_t target_dev_control_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);

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

static ssize_t target_dev_alias_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);

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

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

static ssize_t target_dev_alias_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);
        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 ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);

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

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

static ssize_t target_dev_udev_path_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);
        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 ssize_t target_dev_enable_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);

        return snprintf(page, PAGE_SIZE, "%d\n", target_dev_configured(dev));
}

static ssize_t target_dev_enable_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);
        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 ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);
        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_dev_alua_lu_gp_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);
        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 count;

        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 ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_device(item);
        struct t10_alua_lba_map *map;
        struct t10_alua_lba_map_member *mem;
        char *b = page;
        int bl = 0;
        char state;

        spin_lock(&dev->t10_alua.lba_map_lock);
        if (!list_empty(&dev->t10_alua.lba_map_list))
            bl += sprintf(b + bl, "%u %u\n",
                          dev->t10_alua.lba_map_segment_size,
                          dev->t10_alua.lba_map_segment_multiplier);
        list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
                bl += sprintf(b + bl, "%llu %llu",
                              map->lba_map_first_lba, map->lba_map_last_lba);
                list_for_each_entry(mem, &map->lba_map_mem_list,
                                    lba_map_mem_list) {
                        switch (mem->lba_map_mem_alua_state) {
                        case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
                                state = 'O';
                                break;
                        case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
                                state = 'A';
                                break;
                        case ALUA_ACCESS_STATE_STANDBY:
                                state = 'S';
                                break;
                        case ALUA_ACCESS_STATE_UNAVAILABLE:
                                state = 'U';
                                break;
                        default:
                                state = '.';
                                break;
                        }
                        bl += sprintf(b + bl, " %d:%c",
                                      mem->lba_map_mem_alua_pg_id, state);
                }
                bl += sprintf(b + bl, "\n");
        }
        spin_unlock(&dev->t10_alua.lba_map_lock);
        return bl;
}

static ssize_t target_dev_lba_map_store(struct config_item *item,
                const char *page, size_t count)
{
        struct se_device *dev = to_device(item);
        struct t10_alua_lba_map *lba_map = NULL;
        struct list_head lba_list;
        char *map_entries, *orig, *ptr;
        char state;
        int pg_num = -1, pg;
        int ret = 0, num = 0, pg_id, alua_state;
        unsigned long start_lba = -1, end_lba = -1;
        unsigned long segment_size = -1, segment_mult = -1;

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

        INIT_LIST_HEAD(&lba_list);
        while ((ptr = strsep(&map_entries, "\n")) != NULL) {
                if (!*ptr)
                        continue;

                if (num == 0) {
                        if (sscanf(ptr, "%lu %lu\n",
                                   &segment_size, &segment_mult) != 2) {
                                pr_err("Invalid line %d\n", num);
                                ret = -EINVAL;
                                break;
                        }
                        num++;
                        continue;
                }
                if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
                        pr_err("Invalid line %d\n", num);
                        ret = -EINVAL;
                        break;
                }
                ptr = strchr(ptr, ' ');
                if (!ptr) {
                        pr_err("Invalid line %d, missing end lba\n", num);
                        ret = -EINVAL;
                        break;
                }
                ptr++;
                ptr = strchr(ptr, ' ');
                if (!ptr) {
                        pr_err("Invalid line %d, missing state definitions\n",
                               num);
                        ret = -EINVAL;
                        break;
                }
                ptr++;
                lba_map = core_alua_allocate_lba_map(&lba_list,
                                                     start_lba, end_lba);
                if (IS_ERR(lba_map)) {
                        ret = PTR_ERR(lba_map);
                        break;
                }
                pg = 0;
                while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
                        switch (state) {
                        case 'O':
                                alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
                                break;
                        case 'A':
                                alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
                                break;
                        case 'S':
                                alua_state = ALUA_ACCESS_STATE_STANDBY;
                                break;
                        case 'U':
                                alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
                                break;
                        default:
                                pr_err("Invalid ALUA state '%c'\n", state);
                                ret = -EINVAL;
                                goto out;
                        }

                        ret = core_alua_allocate_lba_map_mem(lba_map,
                                                             pg_id, alua_state);
                        if (ret) {
                                pr_err("Invalid target descriptor %d:%c "
                                       "at line %d\n",
                                       pg_id, state, num);
                                break;
                        }
                        pg++;
                        ptr = strchr(ptr, ' ');
                        if (ptr)
                                ptr++;
                        else
                                break;
                }
                if (pg_num == -1)
                    pg_num = pg;
                else if (pg != pg_num) {
                        pr_err("Only %d from %d port groups definitions "
                               "at line %d\n", pg, pg_num, num);
                        ret = -EINVAL;
                        break;
                }
                num++;
        }
out:
        if (ret) {
                core_alua_free_lba_map(&lba_list);
                count = ret;
        } else
                core_alua_set_lba_map(dev, &lba_list,
                                      segment_size, segment_mult);
        kfree(orig);
        return count;
}

CONFIGFS_ATTR_RO(target_dev_, info);
CONFIGFS_ATTR_WO(target_dev_, control);
CONFIGFS_ATTR(target_dev_, alias);
CONFIGFS_ATTR(target_dev_, udev_path);
CONFIGFS_ATTR(target_dev_, enable);
CONFIGFS_ATTR(target_dev_, alua_lu_gp);
CONFIGFS_ATTR(target_dev_, lba_map);

static struct configfs_attribute *target_core_dev_attrs[] = {
        &target_dev_attr_info,
        &target_dev_attr_control,
        &target_dev_attr_alias,
        &target_dev_attr_udev_path,
        &target_dev_attr_enable,
        &target_dev_attr_alua_lu_gp,
        &target_dev_attr_lba_map,
        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);

        target_free_device(dev);
}

/*
 * Used in target_core_fabric_configfs.c to verify valid se_device symlink
 * within target_fabric_port_link()
 */
struct configfs_item_operations target_core_dev_item_ops = {
        .release                = target_core_dev_release,
};

TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);

/* End functions for struct config_item_type tb_dev_cit */

/* Start functions for struct config_item_type target_core_alua_lu_gp_cit */

static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
{
        return container_of(to_config_group(item), struct t10_alua_lu_gp,
                        lu_gp_group);
}

static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
{
        struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);

        if (!lu_gp->lu_gp_valid_id)
                return 0;
        return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
}

static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
        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;
}

static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
{
        struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
        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;
}

CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
CONFIGFS_ATTR_RO(target_lu_gp_, members);

static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
        &target_lu_gp_attr_lu_gp_id,
        &target_lu_gp_attr_members,
        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,
};

static const 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 const 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 */

static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
{
        return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
                        tg_pt_gp_group);
}

static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
                char *page)
{
        return sprintf(page, "%d\n",
                       to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
}

static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        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;
        }
        if (!target_dev_configured(dev)) {
                pr_err("Unable to set alua_access_state while device is"
                       " not configured\n");
                return -ENODEV;
        }

        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;
        }
        if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
            new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
                /* LBA DEPENDENT is only allowed with implicit ALUA */
                pr_err("Unable to process implicit configfs ALUA transition"
                       " while explicit ALUA management is enabled\n");
                return -EINVAL;
        }

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

static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
                char *page)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        return sprintf(page, "%s\n",
                core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
}

static ssize_t target_tg_pt_gp_alua_access_status_store(
                struct config_item *item, const char *page, size_t count)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        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;
}

static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
                char *page)
{
        return core_alua_show_access_type(to_tg_pt_gp(item), page);
}

static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
                const char *page, size_t count)
{
        return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
}

#define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
                struct config_item *item, char *p)                      \
{                                                                       \
        struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
        return sprintf(p, "%d\n",                                       \
                !!(t->tg_pt_gp_alua_supported_states & _bit));          \
}                                                                       \
                                                                        \
static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
                struct config_item *item, const char *p, size_t c)      \
{                                                                       \
        struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
        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->tg_pt_gp_alua_supported_states |= _bit;              \
        else                                                            \
                t->tg_pt_gp_alua_supported_states &= ~_bit;             \
                                                                        \
        return c;                                                       \
}

ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);

static ssize_t target_tg_pt_gp_alua_write_metadata_show(
                struct config_item *item, char *page)
{
        return sprintf(page, "%d\n",
                to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
}

static ssize_t target_tg_pt_gp_alua_write_metadata_store(
                struct config_item *item, const char *page, size_t count)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        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;
}

static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
                char *page)
{
        return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
}

static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
                const char *page, size_t count)
{
        return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
                        count);
}

static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
                char *page)
{
        return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
}

static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
                const char *page, size_t count)
{
        return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
                        count);
}

static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
                struct config_item *item, char *page)
{
        return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
}

static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
                struct config_item *item, const char *page, size_t count)
{
        return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
                        count);
}

static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
                char *page)
{
        return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
}

static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
                const char *page, size_t count)
{
        return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
}

static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
                char *page)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);

        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_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
                const char *page, size_t count)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        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("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
                       page);
                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;
}

static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
                char *page)
{
        struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
        struct se_lun *lun;
        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(lun, &tg_pt_gp->tg_pt_gp_lun_list,
                        lun_tg_pt_gp_link) {
                struct se_portal_group *tpg = lun->lun_tpg;

                cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
                        "/%s\n", tpg->se_tpg_tfo->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;
}

CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
CONFIGFS_ATTR(target_tg_pt_gp_, preferred);