target_core_configfs.c

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/*******************************************************************************
 * Filename:  target_core_configfs.c
 *
 * This file contains ConfigFS logic for the Generic Target Engine project.
 *
 * Copyright (c) 2008-2011 Rising Tide Systems
 * Copyright (c) 2008-2011 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <[email protected]>
 *
 * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/

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

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

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

extern struct t10_alua_lu_gp *default_lu_gp;

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

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

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

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

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

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

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

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

    if (!name)
        return NULL;

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

    return NULL;
}

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

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

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

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

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

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

    return &tf->tf_group;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    kfree(tf);
}
EXPORT_SYMBOL(target_fabric_configfs_free);

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

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

    return 0;
}

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

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

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

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

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

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

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

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

/* Start functions for struct config_item_type target_core_dev_attrib_cit */

#define DEF_DEV_ATTRIB_SHOW(_name)                  \
static ssize_t target_core_dev_show_attr_##_name(           \
    struct se_dev_attrib *da,                   \
    char *page)                         \
{                                   \
    struct se_device *dev;                      \
    struct se_subsystem_dev *se_dev = da->da_sub_dev;           \
    ssize_t rb;                         \
                                    \
    spin_lock(&se_dev->se_dev_lock);                \
    dev = se_dev->se_dev_ptr;                   \
    if (!dev) {                         \
        spin_unlock(&se_dev->se_dev_lock);          \
        return -ENODEV;                     \
    }                               \
    rb = snprintf(page, PAGE_SIZE, "%u\n",              \
        (u32)dev->se_sub_dev->se_dev_attrib._name);     \
    spin_unlock(&se_dev->se_dev_lock);              \
                                    \
    return rb;                          \
}

#define DEF_DEV_ATTRIB_STORE(_name)                 \
static ssize_t target_core_dev_store_attr_##_name(          \
    struct se_dev_attrib *da,                   \
    const char *page,                       \
    size_t count)                           \
{                                   \
    struct se_device *dev;                      \
    struct se_subsystem_dev *se_dev = da->da_sub_dev;           \
    unsigned long val;                      \
    int ret;                            \
                                    \
    spin_lock(&se_dev->se_dev_lock);                \
    dev = se_dev->se_dev_ptr;                   \
    if (!dev) {                         \
        spin_unlock(&se_dev->se_dev_lock);          \
        return -ENODEV;                     \
    }                               \
    ret = strict_strtoul(page, 0, &val);                \
    if (ret < 0) {                          \
        spin_unlock(&se_dev->se_dev_lock);                      \
        pr_err("strict_strtoul() failed with"       \
            " ret: %d\n", ret);             \
        return -EINVAL;                     \
    }                               \
    ret = se_dev_set_##_name(dev, (u32)val);            \
    spin_unlock(&se_dev->se_dev_lock);              \
                                    \
    return (!ret) ? count : -EINVAL;                \
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

DEF_DEV_ATTRIB_RO(hw_block_size);
SE_DEV_ATTR_RO(hw_block_size);

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

DEF_DEV_ATTRIB_RO(hw_max_sectors);
SE_DEV_ATTR_RO(hw_max_sectors);

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

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

DEF_DEV_ATTRIB_RO(hw_queue_depth);
SE_DEV_ATTR_RO(hw_queue_depth);

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

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

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

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

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

CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);

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

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

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

/* End functions for struct config_item_type target_core_dev_attrib_cit */

/*  Start functions for struct config_item_type target_core_dev_wwn_cit */

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

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

/*
 * VPD page 0x80 Unit serial
 */
static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
    struct t10_wwn *t10_wwn,
    char *page)
{
    struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
    struct se_device *dev;

    dev = se_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
        &t10_wwn->unit_serial[0]);
}

static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
    struct t10_wwn *t10_wwn,
    const char *page,
    size_t count)
{
    struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
    struct se_device *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 (su_dev->su_dev_flags & SDF_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.
     */
    dev = su_dev->se_dev_ptr;
    if (dev) {
        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
            pr_err("Unable to set VPD Unit Serial while"
                " active %d $FABRIC_MOD exports exist\n",
                atomic_read(&dev->dev_export_obj.obj_access_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(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
            "%s", strstrip(buf));
    su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;

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

    return count;
}

SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);

/*
 * VPD page 0x83 Protocol Identifier
 */
static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
    struct t10_wwn *t10_wwn,
    char *page)
{
    struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
    struct se_device *dev;
    struct t10_vpd *vpd;
    unsigned char buf[VPD_TMP_BUF_SIZE];
    ssize_t len = 0;

    dev = se_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    memset(buf, 0, VPD_TMP_BUF_SIZE);

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

        transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);

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

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

    return len;
}

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

SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);

/*
 * Generic wrapper for dumping VPD identifiers by association.
 */
#define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)               \
static ssize_t target_core_dev_wwn_show_attr_##_name(           \
    struct t10_wwn *t10_wwn,                    \
    char *page)                         \
{                                   \
    struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;     \
    struct se_device *dev;                      \
    struct t10_vpd *vpd;                            \
    unsigned char buf[VPD_TMP_BUF_SIZE];                \
    ssize_t len = 0;                        \
                                    \
    dev = se_dev->se_dev_ptr;                   \
    if (!dev)                           \
        return -ENODEV;                     \
                                    \
    spin_lock(&t10_wwn->t10_vpd_lock);              \
    list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
        if (vpd->association != _assoc)             \
            continue;                   \
                                    \
        memset(buf, 0, VPD_TMP_BUF_SIZE);           \
        transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
        if (len + strlen(buf) >= PAGE_SIZE)         \
            break;                      \
        len += sprintf(page+len, "%s", buf);            \
                                    \
        memset(buf, 0, VPD_TMP_BUF_SIZE);           \
        transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
        if (len + strlen(buf) >= PAGE_SIZE)         \
            break;                      \
        len += sprintf(page+len, "%s", buf);            \
                                    \
        memset(buf, 0, VPD_TMP_BUF_SIZE);           \
        transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
        if (len + strlen(buf) >= PAGE_SIZE)         \
            break;                      \
        len += sprintf(page+len, "%s", buf);            \
    }                               \
    spin_unlock(&t10_wwn->t10_vpd_lock);                \
                                    \
    return len;                         \
}

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

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

SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);

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

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

SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);

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

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

SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);

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

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

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

/*  End functions for struct config_item_type target_core_dev_wwn_cit */

/*  Start functions for struct config_item_type target_core_dev_pr_cit */

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

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

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

    memset(i_buf, 0, PR_REG_ISID_ID_LEN);

    spin_lock(&dev->dev_reservation_lock);
    pr_reg = dev->dev_pr_res_holder;
    if (!pr_reg) {
        *len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
        spin_unlock(&dev->dev_reservation_lock);
        return *len;
    }
    se_nacl = pr_reg->pr_reg_nacl;
    prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
                PR_REG_ISID_ID_LEN);

    *len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
        se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
        se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
    spin_unlock(&dev->dev_reservation_lock);

    return *len;
}

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

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

    return *len;
}

static ssize_t target_core_dev_pr_show_attr_res_holder(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    ssize_t len = 0;

    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    switch (su_dev->t10_pr.res_type) {
    case SPC3_PERSISTENT_RESERVATIONS:
        target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
                page, &len);
        break;
    case SPC2_RESERVATIONS:
        target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
                page, &len);
        break;
    case SPC_PASSTHROUGH:
        len += sprintf(page+len, "Passthrough\n");
        break;
    default:
        len += sprintf(page+len, "Unknown\n");
        break;
    }

    return len;
}

SE_DEV_PR_ATTR_RO(res_holder);

/*
 * res_pr_all_tgt_pts
 */
static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    struct se_device *dev;
    struct t10_pr_registration *pr_reg;
    ssize_t len = 0;

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return len;

    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");
        spin_unlock(&dev->dev_reservation_lock);
        return len;
    }
    /*
     * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
     * Basic PERSISTENT RESERVER OUT parameter list, page 290
     */
    if (pr_reg->pr_reg_all_tg_pt)
        len = sprintf(page, "SPC-3 Reservation: All Target"
            " Ports registration\n");
    else
        len = sprintf(page, "SPC-3 Reservation: Single"
            " Target Port registration\n");
    spin_unlock(&dev->dev_reservation_lock);

    return len;
}

SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);

/*
 * res_pr_generation
 */
static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return 0;

    return sprintf(page, "0x%08x\n", su_dev->t10_pr.pr_generation);
}

SE_DEV_PR_ATTR_RO(res_pr_generation);

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

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return len;

    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");
        spin_unlock(&dev->dev_reservation_lock);
        return len;
    }
    se_nacl = pr_reg->pr_reg_nacl;
    se_tpg = se_nacl->se_tpg;
    lun = pr_reg->pr_reg_tg_pt_lun;
    tfo = se_tpg->se_tpg_tfo;

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

    return len;
}

SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);

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

    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return len;

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

    spin_lock(&su_dev->t10_pr.registration_lock);
    list_for_each_entry(pr_reg, &su_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;
        prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
                    PR_REG_ISID_ID_LEN);
        sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
            tfo->get_fabric_name(),
            pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
            &i_buf[0] : "", 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(&su_dev->t10_pr.registration_lock);

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

    return len;
}

SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);

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

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return len;

    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");
        spin_unlock(&dev->dev_reservation_lock);
        return len;
    }
    len = sprintf(page, "SPC-3 Reservation Type: %s\n",
        core_scsi3_pr_dump_type(pr_reg->pr_res_type));
    spin_unlock(&dev->dev_reservation_lock);

    return len;
}

SE_DEV_PR_ATTR_RO(res_pr_type);

/*
 * res_type
 */
static ssize_t target_core_dev_pr_show_attr_res_type(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    ssize_t len = 0;

    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    switch (su_dev->t10_pr.res_type) {
    case SPC3_PERSISTENT_RESERVATIONS:
        len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
        break;
    case SPC2_RESERVATIONS:
        len = sprintf(page, "SPC2_RESERVATIONS\n");
        break;
    case SPC_PASSTHROUGH:
        len = sprintf(page, "SPC_PASSTHROUGH\n");
        break;
    default:
        len = sprintf(page, "UNKNOWN\n");
        break;
    }

    return len;
}

SE_DEV_PR_ATTR_RO(res_type);

/*
 * res_aptpl_active
 */

static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return 0;

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

SE_DEV_PR_ATTR_RO(res_aptpl_active);

/*
 * res_aptpl_metadata
 */
static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
    struct se_subsystem_dev *su_dev,
    char *page)
{
    if (!su_dev->se_dev_ptr)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return 0;

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

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

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

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

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
        return 0;

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

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

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

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

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

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

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

SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);

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

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

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

/*  End functions for struct config_item_type target_core_dev_pr_cit */

/*  Start functions for struct config_item_type target_core_dev_cit */

static ssize_t target_core_show_dev_info(void *p, char *page)
{
    struct se_subsystem_dev *se_dev = p;
    struct se_hba *hba = se_dev->se_dev_hba;
    struct se_subsystem_api *t = hba->transport;
    int bl = 0;
    ssize_t read_bytes = 0;

    if (!se_dev->se_dev_ptr)
        return -ENODEV;

    transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
    read_bytes += bl;
    read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
    return read_bytes;
}

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

static ssize_t target_core_store_dev_control(
    void *p,
    const char *page,
    size_t count)
{
    struct se_subsystem_dev *se_dev = p;
    struct se_hba *hba = se_dev->se_dev_hba;
    struct se_subsystem_api *t = hba->transport;

    if (!se_dev->se_dev_su_ptr) {
        pr_err("Unable to locate struct se_subsystem_dev>se"
                "_dev_su_ptr\n");
        return -EINVAL;
    }

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

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

static ssize_t target_core_show_dev_alias(void *p, char *page)
{
    struct se_subsystem_dev *se_dev = p;

    if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
        return 0;

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

static ssize_t target_core_store_dev_alias(
    void *p,
    const char *page,
    size_t count)
{
    struct se_subsystem_dev *se_dev = p;
    struct se_hba *hba = se_dev->se_dev_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(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
            "%s", page);
    if (!read_bytes)
        return -EINVAL;
    if (se_dev->se_dev_alias[read_bytes - 1] == '\n')
        se_dev->se_dev_alias[read_bytes - 1] = '\0';

    se_dev->su_dev_flags |= SDF_USING_ALIAS;

    pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
        config_item_name(&hba->hba_group.cg_item),
        config_item_name(&se_dev->se_dev_group.cg_item),
        se_dev->se_dev_alias);

    return read_bytes;
}

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

static ssize_t target_core_show_dev_udev_path(void *p, char *page)
{
    struct se_subsystem_dev *se_dev = p;

    if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH))
        return 0;

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

static ssize_t target_core_store_dev_udev_path(
    void *p,
    const char *page,
    size_t count)
{
    struct se_subsystem_dev *se_dev = p;
    struct se_hba *hba = se_dev->se_dev_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(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
            "%s", page);
    if (!read_bytes)
        return -EINVAL;
    if (se_dev->se_dev_udev_path[read_bytes - 1] == '\n')
        se_dev->se_dev_udev_path[read_bytes - 1] = '\0';

    se_dev->su_dev_flags |= SDF_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(&se_dev->se_dev_group.cg_item),
        se_dev->se_dev_udev_path);

    return read_bytes;
}

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

static ssize_t target_core_store_dev_enable(
    void *p,
    const char *page,
    size_t count)
{
    struct se_subsystem_dev *se_dev = p;
    struct se_device *dev;
    struct se_hba *hba = se_dev->se_dev_hba;
    struct se_subsystem_api *t = hba->transport;
    char *ptr;

    ptr = strstr(page, "1");
    if (!ptr) {
        pr_err("For dev_enable ops, only valid value"
                " is \"1\"\n");
        return -EINVAL;
    }
    if (se_dev->se_dev_ptr) {
        pr_err("se_dev->se_dev_ptr already set for storage"
                " object\n");
        return -EEXIST;
    }

    if (t->check_configfs_dev_params(hba, se_dev) < 0)
        return -EINVAL;

    dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
    if (IS_ERR(dev))
        return PTR_ERR(dev);
    else if (!dev)
        return -EINVAL;

    se_dev->se_dev_ptr = dev;
    pr_debug("Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
        " %p\n", se_dev->se_dev_ptr);

    return count;
}

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

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

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED)
        return len;

    lu_gp_mem = dev->dev_alua_lu_gp_mem;
    if (!lu_gp_mem) {
        pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
                " pointer\n");
        return -EINVAL;
    }

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

    return len;
}

static ssize_t target_core_store_alua_lu_gp(
    void *p,
    const char *page,
    size_t count)
{
    struct se_device *dev;
    struct se_subsystem_dev *su_dev = p;
    struct se_hba *hba = su_dev->se_dev_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;

    dev = su_dev->se_dev_ptr;
    if (!dev)
        return -ENODEV;

    if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
        pr_warn("SPC3_ALUA_EMULATED not enabled for %s/%s\n",
            config_item_name(&hba->hba_group.cg_item),
            config_item_name(&su_dev->se_dev_group.cg_item));
        return -EINVAL;
    }
    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;
    }
    lu_gp_mem = dev->dev_alua_lu_gp_mem;
    if (!lu_gp_mem) {
        if (lu_gp_new)
            core_alua_put_lu_gp_from_name(lu_gp_new);
        pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
                " pointer\n");
        return -EINVAL;
    }

    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(&su_dev->se_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(&su_dev->se_dev_group.cg_item),
        config_item_name(&lu_gp_new->lu_gp_group.cg_item),
        lu_gp_new->lu_gp_id);

    core_alua_put_lu_gp_from_name(lu_gp_new);
    return count;
}

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

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

static void target_core_dev_release(struct config_item *item)
{
    struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
                struct se_subsystem_dev, se_dev_group);
    struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
    struct se_subsystem_api *t = hba->transport;
    struct config_group *dev_cg = &se_dev->se_dev_group;

    kfree(dev_cg->default_groups);
    /*
     * This pointer will set when the storage is enabled with:
     *`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
     */
    if (se_dev->se_dev_ptr) {
        pr_debug("Target_Core_ConfigFS: Calling se_free_"
            "virtual_device() for se_dev_ptr: %p\n",
            se_dev->se_dev_ptr);

        se_free_virtual_device(se_dev->se_dev_ptr, hba);
    } else {
        /*
         * Release struct se_subsystem_dev->se_dev_su_ptr..
         */
        pr_debug("Target_Core_ConfigFS: Calling t->free_"
            "device() for se_dev_su_ptr: %p\n",
            se_dev->se_dev_su_ptr);

        t->free_device(se_dev->se_dev_su_ptr);
    }

    pr_debug("Target_Core_ConfigFS: Deallocating se_subsystem"
            "_dev_t: %p\n", se_dev);
    kfree(se_dev);
}

static ssize_t target_core_dev_show(struct config_item *item,
                     struct configfs_attribute *attr,
                     char *page)
{
    struct se_subsystem_dev *se_dev = container_of(
            to_config_group(item), struct se_subsystem_dev,
            se_dev_group);
    struct target_core_configfs_attribute *tc_attr = container_of(
            attr, struct target_core_configfs_attribute, attr);

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

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

static ssize_t target_core_dev_store(struct config_item *item,
                      struct configfs_attribute *attr,
                      const char *page, size_t count)
{
    struct se_subsystem_dev *se_dev = container_of(
            to_config_group(item), struct se_subsystem_dev,
            se_dev_group);
    struct target_core_configfs_attribute *tc_attr = container_of(
            attr, struct target_core_configfs_attribute, attr);

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

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

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

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

/* End functions for struct config_item_type target_core_dev_cit */

/* Start functions for struct config_item_type target_core_alua_lu_gp_cit */

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

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

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

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

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

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

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

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

    return count;
}

SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);

/*
 * members
 */
static ssize_t target_core_alua_lu_gp_show_attr_members(
    struct t10_alua_lu_gp *lu_gp,
    char *page)
{
    struct se_device *dev;
    struct se_hba *hba;
    struct se_subsystem_dev *su_dev;
    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;
        su_dev = dev->se_sub_dev;
        hba = su_dev->se_dev_hba;

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

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

    return len;
}

SE_DEV_ALUA_LU_ATTR_RO(members);

CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);

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

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

    core_alua_free_lu_gp(lu_gp);
}

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

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

/* End functions for struct config_item_type target_core_alua_lu_gp_cit */

/* Start functions for struct config_item_type target_core_alua_lu_gps_cit */

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

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

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

    config_group_init_type_name(alua_lu_gp_cg, name,
            &target_core_alua_lu_gp_cit);

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

    return alua_lu_gp_cg;

}

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

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

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

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

/* End functions for struct config_item_type target_core_alua_lu_gps_cit */

/* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */

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

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

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

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

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

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

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

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

SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);

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

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

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

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

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

    tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
    return count;
}

SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);

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

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

SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);

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

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

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

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

    return count;
}

SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);



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

}

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

SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);

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

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

SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);

/*
 * implict_trans_secs
 */
static ssize_t target_core_alua_tg_pt_gp_show_attr_implict_trans_secs(
    struct t10_alua_tg_pt_gp *tg_pt_gp,
    char *page)
{
    return core_alua_show_implict_trans_secs(tg_pt_gp, page);
}

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

SE_DEV_ALUA_TG_PT_ATTR(implict_trans_secs, S_IRUGO | S_IWUSR);

/*
 * preferred
 */

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

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

SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);

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

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

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

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

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

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

    return count;
}

SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);

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

    memset(buf, 0, TG_PT_GROUP_NAME_BUF);

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

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

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

    return len;
}

SE_DEV_ALUA_TG_PT_ATTR_RO(members);

CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
            tg_pt_gp_group);

static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
    &target_core_alua_tg_pt_gp_alua_access_state.attr,
    &target_core_alua_tg_pt_gp_alua_access_status.attr,
    &target_core_alua_tg_pt_gp_alua_access_type.attr,
    &target_core_alua_tg_pt_gp_alua_write_metadata.attr,
    &target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
    &target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
    &target_core_alua_tg_pt_gp_implict_trans_secs.attr,
    &target_core_alua_tg_pt_gp_preferred.attr,
    &target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
    &target_core_alua_tg_pt_gp_members.attr,
    NULL,
};

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

    core_alua_free_tg_pt_gp(tg_pt_gp);
}

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

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

/* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */

/* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */

static struct config_group *target_core_alua_create_tg_pt_gp(
    struct config_group *group,
    const char *name)
{
    struct t10_alua *alua = container_of(group, struct t10_alua,
                    alua_tg_pt_gps_group);
    struct t10_alua_tg_pt_gp *tg_pt_gp;
    struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
    struct config_group *alua_tg_pt_gp_cg = NULL;
    struct config_item *alua_tg_pt_gp_ci = NULL;

    tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
    if (!tg_pt_gp)
        return NULL;

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

    config_group_init_type_name(alua_tg_pt_gp_cg, name,
            &target_core_alua_tg_pt_gp_cit);

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

    return alua_tg_pt_gp_cg;
}

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

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

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

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

/* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */

/* Start functions for struct config_item_type target_core_alua_cit */

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

/* End functions for struct config_item_type target_core_alua_cit */

/* Start functions for struct config_item_type target_core_stat_cit */

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

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

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

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

/* End functions for struct config_item_type target_core_stat_cit */

/* Start functions for struct config_item_type target_core_hba_cit */

static struct config_group *target_core_make_subdev(
    struct config_group *group,
    const char *name)
{
    struct t10_alua_tg_pt_gp *tg_pt_gp;
    struct se_subsystem_dev *se_dev;
    struct se_subsystem_api *t;
    struct config_item *hba_ci = &group->cg_item;
    struct se_hba *hba = item_to_hba(hba_ci);
    struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
    struct config_group *dev_stat_grp = NULL;
    int errno = -ENOMEM, ret;

    ret = mutex_lock_interruptible(&hba->hba_access_mutex);
    if (ret)
        return ERR_PTR(ret);
    /*
     * Locate the struct se_subsystem_api from parent's struct se_hba.
     */
    t = hba->transport;

    se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
    if (!se_dev) {
        pr_err("Unable to allocate memory for"
                " struct se_subsystem_dev\n");
        goto unlock;
    }
    INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
    spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
    INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
    INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
    spin_lock_init(&se_dev->t10_pr.registration_lock);
    spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
    INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
    spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
    spin_lock_init(&se_dev->se_dev_lock);
    se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
    se_dev->t10_wwn.t10_sub_dev = se_dev;
    se_dev->t10_alua.t10_sub_dev = se_dev;
    se_dev->se_dev_attrib.da_sub_dev = se_dev;

    se_dev->se_dev_hba = hba;
    dev_cg = &se_dev->se_dev_group;

    dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 7,
            GFP_KERNEL);
    if (!dev_cg->default_groups)
        goto out;
    /*
     * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
     * for ->allocate_virtdevice()
     *
     * se_dev->se_dev_ptr will be set after ->create_virtdev()
     * has been called successfully in the next level up in the
     * configfs tree for device object's struct config_group.
     */
    se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
    if (!se_dev->se_dev_su_ptr) {
        pr_err("Unable to locate subsystem dependent pointer"
            " from allocate_virtdevice()\n");
        goto out;
    }

    config_group_init_type_name(&se_dev->se_dev_group, name,
            &target_core_dev_cit);
    config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
            &target_core_dev_attrib_cit);
    config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
            &target_core_dev_pr_cit);
    config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
            &target_core_dev_wwn_cit);
    config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
            "alua", &target_core_alua_tg_pt_gps_cit);
    config_group_init_type_name(&se_dev->dev_stat_grps.stat_group,
            "statistics", &target_core_stat_cit);

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

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

    config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
            "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
    tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
    tg_pt_gp_cg->default_groups[1] = NULL;
    se_dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
    /*
     * Add core/$HBA/$DEV/statistics/ default groups
     */
    dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
    dev_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 4,
                GFP_KERNEL);
    if (!dev_stat_grp->default_groups) {
        pr_err("Unable to allocate dev_stat_grp->default_groups\n");
        goto out;
    }
    target_stat_setup_dev_default_groups(se_dev);

    pr_debug("Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
        " %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);

    mutex_unlock(&hba->hba_access_mutex);
    return &se_dev->se_dev_group;
out:
    if (se_dev->t10_alua.default_tg_pt_gp) {
        core_alua_free_tg_pt_gp(se_dev->t10_alua.default_tg_pt_gp);
        se_dev->t10_alua.default_tg_pt_gp = NULL;
    }
    if (dev_stat_grp)
        kfree(dev_stat_grp->default_groups);
    if (tg_pt_gp_cg)
        kfree(tg_pt_gp_cg->default_groups);
    if (dev_cg)
        kfree(dev_cg->default_groups);
    if (se_dev->se_dev_su_ptr)
        t->free_device(se_dev->se_dev_su_ptr);
    kfree(se_dev);
unlock:
    mutex_unlock(&hba->hba_access_mutex);
    return ERR_PTR(errno);
}

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

    hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);

    mutex_lock(&hba->hba_access_mutex);

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

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

    dev_cg = &se_dev->se_dev_group;
    for (i = 0; dev_cg->default_groups[i]; i++) {
        df_item = &dev_cg->default_groups[i]->cg_item;
        dev_cg->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    /*
     * The releasing of se_dev and associated se_dev->se_dev_ptr is done
     * from target_core_dev_item_ops->release() ->target_core_dev_release().
     */
    config_item_put(item);
    mutex_unlock(&hba->hba_access_mutex);
}

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

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

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

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

SE_HBA_ATTR_RO(hba_info);

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

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

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

static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
                const char *page, size_t count)
{
    struct se_subsystem_api *transport = hba->transport;
    unsigned long mode_flag;
    int ret;

    if (transport->pmode_enable_hba == NULL)
        return -EINVAL;

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

    spin_lock(&hba->device_lock);
    if (!list_empty(&hba->hba_dev_list)) {
        pr_err("Unable to set hba_mode with active devices\n");
        spin_unlock(&hba->device_lock);
        return -EINVAL;
    }
    spin_unlock(&hba->device_lock);

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

    return count;
}

SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);

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

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

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

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

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

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

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

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

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

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

    return &hba->hba_group;
}

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

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

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

/* Stop functions for struct config_item_type target_core_hba_cit */

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

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

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

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

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

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

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

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

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

    return 0;

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

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

    subsys = target_core_subsystem[0];

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

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

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

    core_alua_free_lu_gp(default_lu_gp);
    default_lu_gp = NULL;

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

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

MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
MODULE_AUTHOR("[email protected]");
MODULE_LICENSE("GPL");

module_init(target_core_init_configfs);
module_exit(target_core_exit_configfs);