target_core_fabric_configfs.c

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/*******************************************************************************
* Filename: target_core_fabric_configfs.c
 *
 * This file contains generic fabric module configfs infrastructure for
 * TCM v4.x code
 *
 * Copyright (c) 2010,2011 Rising Tide Systems
 * Copyright (c) 2010,2011 Linux-iSCSI.org
 *
 * Copyright (c) Nicholas A. Bellinger <[email protected]>
*
 * 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 <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/syscalls.h>
#include <linux/configfs.h>

#include <target/target_core_base.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"

#define TF_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)      \
static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
{                                   \
    struct target_fabric_configfs_template *tfc = &tf->tf_cit_tmpl; \
    struct config_item_type *cit = &tfc->tfc_##_name##_cit;     \
                                    \
    cit->ct_item_ops = _item_ops;                   \
    cit->ct_group_ops = _group_ops;                 \
    cit->ct_attrs = _attrs;                     \
    cit->ct_owner = tf->tf_module;                  \
    pr_debug("Setup generic %s\n", __stringify(_name));     \
}

/* Start of tfc_tpg_mappedlun_cit */

static int target_fabric_mappedlun_link(
    struct config_item *lun_acl_ci,
    struct config_item *lun_ci)
{
    struct se_dev_entry *deve;
    struct se_lun *lun = container_of(to_config_group(lun_ci),
            struct se_lun, lun_group);
    struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
            struct se_lun_acl, se_lun_group);
    struct se_portal_group *se_tpg;
    struct config_item *nacl_ci, *tpg_ci, *tpg_ci_s, *wwn_ci, *wwn_ci_s;
    int ret = 0, lun_access;
    /*
     * Ensure that the source port exists
     */
    if (!lun->lun_sep || !lun->lun_sep->sep_tpg) {
        pr_err("Source se_lun->lun_sep or lun->lun_sep->sep"
                "_tpg does not exist\n");
        return -EINVAL;
    }
    se_tpg = lun->lun_sep->sep_tpg;

    nacl_ci = &lun_acl_ci->ci_parent->ci_group->cg_item;
    tpg_ci = &nacl_ci->ci_group->cg_item;
    wwn_ci = &tpg_ci->ci_group->cg_item;
    tpg_ci_s = &lun_ci->ci_parent->ci_group->cg_item;
    wwn_ci_s = &tpg_ci_s->ci_group->cg_item;
    /*
     * Make sure the SymLink is going to the same $FABRIC/$WWN/tpgt_$TPGT
     */
    if (strcmp(config_item_name(wwn_ci), config_item_name(wwn_ci_s))) {
        pr_err("Illegal Initiator ACL SymLink outside of %s\n",
            config_item_name(wwn_ci));
        return -EINVAL;
    }
    if (strcmp(config_item_name(tpg_ci), config_item_name(tpg_ci_s))) {
        pr_err("Illegal Initiator ACL Symlink outside of %s"
            " TPGT: %s\n", config_item_name(wwn_ci),
            config_item_name(tpg_ci));
        return -EINVAL;
    }
    /*
     * If this struct se_node_acl was dynamically generated with
     * tpg_1/attrib/generate_node_acls=1, use the existing deve->lun_flags,
     * which be will write protected (READ-ONLY) when
     * tpg_1/attrib/demo_mode_write_protect=1
     */
    spin_lock_irq(&lacl->se_lun_nacl->device_list_lock);
    deve = lacl->se_lun_nacl->device_list[lacl->mapped_lun];
    if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)
        lun_access = deve->lun_flags;
    else
        lun_access =
            (se_tpg->se_tpg_tfo->tpg_check_prod_mode_write_protect(
                se_tpg)) ? TRANSPORT_LUNFLAGS_READ_ONLY :
                       TRANSPORT_LUNFLAGS_READ_WRITE;
    spin_unlock_irq(&lacl->se_lun_nacl->device_list_lock);
    /*
     * Determine the actual mapped LUN value user wants..
     *
     * This value is what the SCSI Initiator actually sees the
     * iscsi/$IQN/$TPGT/lun/lun_* as on their SCSI Initiator Ports.
     */
    ret = core_dev_add_initiator_node_lun_acl(se_tpg, lacl,
            lun->unpacked_lun, lun_access);

    return (ret < 0) ? -EINVAL : 0;
}

static int target_fabric_mappedlun_unlink(
    struct config_item *lun_acl_ci,
    struct config_item *lun_ci)
{
    struct se_lun *lun;
    struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
            struct se_lun_acl, se_lun_group);
    struct se_node_acl *nacl = lacl->se_lun_nacl;
    struct se_dev_entry *deve = nacl->device_list[lacl->mapped_lun];
    struct se_portal_group *se_tpg;
    /*
     * Determine if the underlying MappedLUN has already been released..
     */
    if (!deve->se_lun)
        return 0;

    lun = container_of(to_config_group(lun_ci), struct se_lun, lun_group);
    se_tpg = lun->lun_sep->sep_tpg;

    core_dev_del_initiator_node_lun_acl(se_tpg, lun, lacl);
    return 0;
}

CONFIGFS_EATTR_STRUCT(target_fabric_mappedlun, se_lun_acl);
#define TCM_MAPPEDLUN_ATTR(_name, _mode)                \
static struct target_fabric_mappedlun_attribute target_fabric_mappedlun_##_name = \
    __CONFIGFS_EATTR(_name, _mode,                  \
    target_fabric_mappedlun_show_##_name,               \
    target_fabric_mappedlun_store_##_name);

static ssize_t target_fabric_mappedlun_show_write_protect(
    struct se_lun_acl *lacl,
    char *page)
{
    struct se_node_acl *se_nacl = lacl->se_lun_nacl;
    struct se_dev_entry *deve;
    ssize_t len;

    spin_lock_irq(&se_nacl->device_list_lock);
    deve = se_nacl->device_list[lacl->mapped_lun];
    len = sprintf(page, "%d\n",
            (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) ?
            1 : 0);
    spin_unlock_irq(&se_nacl->device_list_lock);

    return len;
}

static ssize_t target_fabric_mappedlun_store_write_protect(
    struct se_lun_acl *lacl,
    const char *page,
    size_t count)
{
    struct se_node_acl *se_nacl = lacl->se_lun_nacl;
    struct se_portal_group *se_tpg = se_nacl->se_tpg;
    unsigned long op;

    if (strict_strtoul(page, 0, &op))
        return -EINVAL;

    if ((op != 1) && (op != 0))
        return -EINVAL;

    core_update_device_list_access(lacl->mapped_lun, (op) ?
            TRANSPORT_LUNFLAGS_READ_ONLY :
            TRANSPORT_LUNFLAGS_READ_WRITE,
            lacl->se_lun_nacl);

    pr_debug("%s_ConfigFS: Changed Initiator ACL: %s"
        " Mapped LUN: %u Write Protect bit to %s\n",
        se_tpg->se_tpg_tfo->get_fabric_name(),
        lacl->initiatorname, lacl->mapped_lun, (op) ? "ON" : "OFF");

    return count;

}

TCM_MAPPEDLUN_ATTR(write_protect, S_IRUGO | S_IWUSR);

CONFIGFS_EATTR_OPS(target_fabric_mappedlun, se_lun_acl, se_lun_group);

static void target_fabric_mappedlun_release(struct config_item *item)
{
    struct se_lun_acl *lacl = container_of(to_config_group(item),
                struct se_lun_acl, se_lun_group);
    struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;

    core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
}

static struct configfs_attribute *target_fabric_mappedlun_attrs[] = {
    &target_fabric_mappedlun_write_protect.attr,
    NULL,
};

static struct configfs_item_operations target_fabric_mappedlun_item_ops = {
    .release        = target_fabric_mappedlun_release,
    .show_attribute     = target_fabric_mappedlun_attr_show,
    .store_attribute    = target_fabric_mappedlun_attr_store,
    .allow_link     = target_fabric_mappedlun_link,
    .drop_link      = target_fabric_mappedlun_unlink,
};

TF_CIT_SETUP(tpg_mappedlun, &target_fabric_mappedlun_item_ops, NULL,
        target_fabric_mappedlun_attrs);

/* End of tfc_tpg_mappedlun_cit */

/* Start of tfc_tpg_mappedlun_port_cit */

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

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

static struct configfs_group_operations target_fabric_mappedlun_stat_group_ops = {
    .make_group     = target_core_mappedlun_stat_mkdir,
    .drop_item      = target_core_mappedlun_stat_rmdir,
};

TF_CIT_SETUP(tpg_mappedlun_stat, NULL, &target_fabric_mappedlun_stat_group_ops,
        NULL);

/* End of tfc_tpg_mappedlun_port_cit */

/* Start of tfc_tpg_nacl_attrib_cit */

CONFIGFS_EATTR_OPS(target_fabric_nacl_attrib, se_node_acl, acl_attrib_group);

static struct configfs_item_operations target_fabric_nacl_attrib_item_ops = {
    .show_attribute     = target_fabric_nacl_attrib_attr_show,
    .store_attribute    = target_fabric_nacl_attrib_attr_store,
};

TF_CIT_SETUP(tpg_nacl_attrib, &target_fabric_nacl_attrib_item_ops, NULL, NULL);

/* End of tfc_tpg_nacl_attrib_cit */

/* Start of tfc_tpg_nacl_auth_cit */

CONFIGFS_EATTR_OPS(target_fabric_nacl_auth, se_node_acl, acl_auth_group);

static struct configfs_item_operations target_fabric_nacl_auth_item_ops = {
    .show_attribute     = target_fabric_nacl_auth_attr_show,
    .store_attribute    = target_fabric_nacl_auth_attr_store,
};

TF_CIT_SETUP(tpg_nacl_auth, &target_fabric_nacl_auth_item_ops, NULL, NULL);

/* End of tfc_tpg_nacl_auth_cit */

/* Start of tfc_tpg_nacl_param_cit */

CONFIGFS_EATTR_OPS(target_fabric_nacl_param, se_node_acl, acl_param_group);

static struct configfs_item_operations target_fabric_nacl_param_item_ops = {
    .show_attribute     = target_fabric_nacl_param_attr_show,
    .store_attribute    = target_fabric_nacl_param_attr_store,
};

TF_CIT_SETUP(tpg_nacl_param, &target_fabric_nacl_param_item_ops, NULL, NULL);

/* End of tfc_tpg_nacl_param_cit */

/* Start of tfc_tpg_nacl_base_cit */

CONFIGFS_EATTR_OPS(target_fabric_nacl_base, se_node_acl, acl_group);

static struct config_group *target_fabric_make_mappedlun(
    struct config_group *group,
    const char *name)
{
    struct se_node_acl *se_nacl = container_of(group,
            struct se_node_acl, acl_group);
    struct se_portal_group *se_tpg = se_nacl->se_tpg;
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
    struct se_lun_acl *lacl;
    struct config_item *acl_ci;
    struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
    char *buf;
    unsigned long mapped_lun;
    int ret = 0;

    acl_ci = &group->cg_item;
    if (!acl_ci) {
        pr_err("Unable to locatel acl_ci\n");
        return NULL;
    }

    buf = kzalloc(strlen(name) + 1, GFP_KERNEL);
    if (!buf) {
        pr_err("Unable to allocate memory for name buf\n");
        return ERR_PTR(-ENOMEM);
    }
    snprintf(buf, strlen(name) + 1, "%s", name);
    /*
     * Make sure user is creating iscsi/$IQN/$TPGT/acls/$INITIATOR/lun_$ID.
     */
    if (strstr(buf, "lun_") != buf) {
        pr_err("Unable to locate \"lun_\" from buf: %s"
            " name: %s\n", buf, name);
        ret = -EINVAL;
        goto out;
    }
    /*
     * Determine the Mapped LUN value.  This is what the SCSI Initiator
     * Port will actually see.
     */
    if (strict_strtoul(buf + 4, 0, &mapped_lun) || mapped_lun > UINT_MAX) {
        ret = -EINVAL;
        goto out;
    }

    lacl = core_dev_init_initiator_node_lun_acl(se_tpg, mapped_lun,
            config_item_name(acl_ci), &ret);
    if (!lacl) {
        ret = -EINVAL;
        goto out;
    }

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

    config_group_init_type_name(&lacl->se_lun_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_mappedlun_cit);
    config_group_init_type_name(&lacl->ml_stat_grps.stat_group,
            "statistics", &TF_CIT_TMPL(tf)->tfc_tpg_mappedlun_stat_cit);
    lacl_cg->default_groups[0] = &lacl->ml_stat_grps.stat_group;
    lacl_cg->default_groups[1] = NULL;

    ml_stat_grp = &lacl->ml_stat_grps.stat_group;
    ml_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 3,
                GFP_KERNEL);
    if (!ml_stat_grp->default_groups) {
        pr_err("Unable to allocate ml_stat_grp->default_groups\n");
        ret = -ENOMEM;
        goto out;
    }
    target_stat_setup_mappedlun_default_groups(lacl);

    kfree(buf);
    return &lacl->se_lun_group;
out:
    if (lacl_cg)
        kfree(lacl_cg->default_groups);
    kfree(buf);
    return ERR_PTR(ret);
}

static void target_fabric_drop_mappedlun(
    struct config_group *group,
    struct config_item *item)
{
    struct se_lun_acl *lacl = container_of(to_config_group(item),
            struct se_lun_acl, se_lun_group);
    struct config_item *df_item;
    struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
    int i;

    ml_stat_grp = &lacl->ml_stat_grps.stat_group;
    for (i = 0; ml_stat_grp->default_groups[i]; i++) {
        df_item = &ml_stat_grp->default_groups[i]->cg_item;
        ml_stat_grp->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    kfree(ml_stat_grp->default_groups);

    lacl_cg = &lacl->se_lun_group;
    for (i = 0; lacl_cg->default_groups[i]; i++) {
        df_item = &lacl_cg->default_groups[i]->cg_item;
        lacl_cg->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    kfree(lacl_cg->default_groups);

    config_item_put(item);
}

static void target_fabric_nacl_base_release(struct config_item *item)
{
    struct se_node_acl *se_nacl = container_of(to_config_group(item),
            struct se_node_acl, acl_group);
    struct se_portal_group *se_tpg = se_nacl->se_tpg;
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;

    tf->tf_ops.fabric_drop_nodeacl(se_nacl);
}

static struct configfs_item_operations target_fabric_nacl_base_item_ops = {
    .release        = target_fabric_nacl_base_release,
    .show_attribute     = target_fabric_nacl_base_attr_show,
    .store_attribute    = target_fabric_nacl_base_attr_store,
};

static struct configfs_group_operations target_fabric_nacl_base_group_ops = {
    .make_group     = target_fabric_make_mappedlun,
    .drop_item      = target_fabric_drop_mappedlun,
};

TF_CIT_SETUP(tpg_nacl_base, &target_fabric_nacl_base_item_ops,
        &target_fabric_nacl_base_group_ops, NULL);

/* End of tfc_tpg_nacl_base_cit */

/* Start of tfc_node_fabric_stats_cit */
/*
 * This is used as a placeholder for struct se_node_acl->acl_fabric_stat_group
 * to allow fabrics access to ->acl_fabric_stat_group->default_groups[]
 */
TF_CIT_SETUP(tpg_nacl_stat, NULL, NULL, NULL);

/* End of tfc_wwn_fabric_stats_cit */

/* Start of tfc_tpg_nacl_cit */

static struct config_group *target_fabric_make_nodeacl(
    struct config_group *group,
    const char *name)
{
    struct se_portal_group *se_tpg = container_of(group,
            struct se_portal_group, tpg_acl_group);
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
    struct se_node_acl *se_nacl;
    struct config_group *nacl_cg;

    if (!tf->tf_ops.fabric_make_nodeacl) {
        pr_err("tf->tf_ops.fabric_make_nodeacl is NULL\n");
        return ERR_PTR(-ENOSYS);
    }

    se_nacl = tf->tf_ops.fabric_make_nodeacl(se_tpg, group, name);
    if (IS_ERR(se_nacl))
        return ERR_CAST(se_nacl);

    nacl_cg = &se_nacl->acl_group;
    nacl_cg->default_groups = se_nacl->acl_default_groups;
    nacl_cg->default_groups[0] = &se_nacl->acl_attrib_group;
    nacl_cg->default_groups[1] = &se_nacl->acl_auth_group;
    nacl_cg->default_groups[2] = &se_nacl->acl_param_group;
    nacl_cg->default_groups[3] = &se_nacl->acl_fabric_stat_group;
    nacl_cg->default_groups[4] = NULL;

    config_group_init_type_name(&se_nacl->acl_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_base_cit);
    config_group_init_type_name(&se_nacl->acl_attrib_group, "attrib",
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_attrib_cit);
    config_group_init_type_name(&se_nacl->acl_auth_group, "auth",
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_auth_cit);
    config_group_init_type_name(&se_nacl->acl_param_group, "param",
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_param_cit);
    config_group_init_type_name(&se_nacl->acl_fabric_stat_group,
            "fabric_statistics",
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_stat_cit);

    return &se_nacl->acl_group;
}

static void target_fabric_drop_nodeacl(
    struct config_group *group,
    struct config_item *item)
{
    struct se_node_acl *se_nacl = container_of(to_config_group(item),
            struct se_node_acl, acl_group);
    struct config_item *df_item;
    struct config_group *nacl_cg;
    int i;

    nacl_cg = &se_nacl->acl_group;
    for (i = 0; nacl_cg->default_groups[i]; i++) {
        df_item = &nacl_cg->default_groups[i]->cg_item;
        nacl_cg->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    /*
     * struct se_node_acl free is done in target_fabric_nacl_base_release()
     */
    config_item_put(item);
}

static struct configfs_group_operations target_fabric_nacl_group_ops = {
    .make_group = target_fabric_make_nodeacl,
    .drop_item  = target_fabric_drop_nodeacl,
};

TF_CIT_SETUP(tpg_nacl, NULL, &target_fabric_nacl_group_ops, NULL);

/* End of tfc_tpg_nacl_cit */

/* Start of tfc_tpg_np_base_cit */

CONFIGFS_EATTR_OPS(target_fabric_np_base, se_tpg_np, tpg_np_group);

static void target_fabric_np_base_release(struct config_item *item)
{
    struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
                struct se_tpg_np, tpg_np_group);
    struct se_portal_group *se_tpg = se_tpg_np->tpg_np_parent;
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;

    tf->tf_ops.fabric_drop_np(se_tpg_np);
}

static struct configfs_item_operations target_fabric_np_base_item_ops = {
    .release        = target_fabric_np_base_release,
    .show_attribute     = target_fabric_np_base_attr_show,
    .store_attribute    = target_fabric_np_base_attr_store,
};

TF_CIT_SETUP(tpg_np_base, &target_fabric_np_base_item_ops, NULL, NULL);

/* End of tfc_tpg_np_base_cit */

/* Start of tfc_tpg_np_cit */

static struct config_group *target_fabric_make_np(
    struct config_group *group,
    const char *name)
{
    struct se_portal_group *se_tpg = container_of(group,
                struct se_portal_group, tpg_np_group);
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
    struct se_tpg_np *se_tpg_np;

    if (!tf->tf_ops.fabric_make_np) {
        pr_err("tf->tf_ops.fabric_make_np is NULL\n");
        return ERR_PTR(-ENOSYS);
    }

    se_tpg_np = tf->tf_ops.fabric_make_np(se_tpg, group, name);
    if (!se_tpg_np || IS_ERR(se_tpg_np))
        return ERR_PTR(-EINVAL);

    se_tpg_np->tpg_np_parent = se_tpg;
    config_group_init_type_name(&se_tpg_np->tpg_np_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_np_base_cit);

    return &se_tpg_np->tpg_np_group;
}

static void target_fabric_drop_np(
    struct config_group *group,
    struct config_item *item)
{
    /*
     * struct se_tpg_np is released via target_fabric_np_base_release()
     */
    config_item_put(item);
}

static struct configfs_group_operations target_fabric_np_group_ops = {
    .make_group = &target_fabric_make_np,
    .drop_item  = &target_fabric_drop_np,
};

TF_CIT_SETUP(tpg_np, NULL, &target_fabric_np_group_ops, NULL);

/* End of tfc_tpg_np_cit */

/* Start of tfc_tpg_port_cit */

CONFIGFS_EATTR_STRUCT(target_fabric_port, se_lun);
#define TCM_PORT_ATTR(_name, _mode)                 \
static struct target_fabric_port_attribute target_fabric_port_##_name = \
    __CONFIGFS_EATTR(_name, _mode,                  \
    target_fabric_port_show_attr_##_name,               \
    target_fabric_port_store_attr_##_name);

#define TCM_PORT_ATTOR_RO(_name)                    \
    __CONFIGFS_EATTR_RO(_name,                  \
    target_fabric_port_show_attr_##_name);

/*
 * alua_tg_pt_gp
 */
static ssize_t target_fabric_port_show_attr_alua_tg_pt_gp(
    struct se_lun *lun,
    char *page)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_show_tg_pt_gp_info(lun->lun_sep, page);
}

static ssize_t target_fabric_port_store_attr_alua_tg_pt_gp(
    struct se_lun *lun,
    const char *page,
    size_t count)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_store_tg_pt_gp_info(lun->lun_sep, page, count);
}

TCM_PORT_ATTR(alua_tg_pt_gp, S_IRUGO | S_IWUSR);

/*
 * alua_tg_pt_offline
 */
static ssize_t target_fabric_port_show_attr_alua_tg_pt_offline(
    struct se_lun *lun,
    char *page)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_show_offline_bit(lun, page);
}

static ssize_t target_fabric_port_store_attr_alua_tg_pt_offline(
    struct se_lun *lun,
    const char *page,
    size_t count)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_store_offline_bit(lun, page, count);
}

TCM_PORT_ATTR(alua_tg_pt_offline, S_IRUGO | S_IWUSR);

/*
 * alua_tg_pt_status
 */
static ssize_t target_fabric_port_show_attr_alua_tg_pt_status(
    struct se_lun *lun,
    char *page)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_show_secondary_status(lun, page);
}

static ssize_t target_fabric_port_store_attr_alua_tg_pt_status(
    struct se_lun *lun,
    const char *page,
    size_t count)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_store_secondary_status(lun, page, count);
}

TCM_PORT_ATTR(alua_tg_pt_status, S_IRUGO | S_IWUSR);

/*
 * alua_tg_pt_write_md
 */
static ssize_t target_fabric_port_show_attr_alua_tg_pt_write_md(
    struct se_lun *lun,
    char *page)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_show_secondary_write_metadata(lun, page);
}

static ssize_t target_fabric_port_store_attr_alua_tg_pt_write_md(
    struct se_lun *lun,
    const char *page,
    size_t count)
{
    if (!lun || !lun->lun_sep)
        return -ENODEV;

    return core_alua_store_secondary_write_metadata(lun, page, count);
}

TCM_PORT_ATTR(alua_tg_pt_write_md, S_IRUGO | S_IWUSR);


static struct configfs_attribute *target_fabric_port_attrs[] = {
    &target_fabric_port_alua_tg_pt_gp.attr,
    &target_fabric_port_alua_tg_pt_offline.attr,
    &target_fabric_port_alua_tg_pt_status.attr,
    &target_fabric_port_alua_tg_pt_write_md.attr,
    NULL,
};

CONFIGFS_EATTR_OPS(target_fabric_port, se_lun, lun_group);

static int target_fabric_port_link(
    struct config_item *lun_ci,
    struct config_item *se_dev_ci)
{
    struct config_item *tpg_ci;
    struct se_device *dev;
    struct se_lun *lun = container_of(to_config_group(lun_ci),
                struct se_lun, lun_group);
    struct se_lun *lun_p;
    struct se_portal_group *se_tpg;
    struct se_subsystem_dev *se_dev = container_of(
                to_config_group(se_dev_ci), struct se_subsystem_dev,
                se_dev_group);
    struct target_fabric_configfs *tf;
    int ret;

    tpg_ci = &lun_ci->ci_parent->ci_group->cg_item;
    se_tpg = container_of(to_config_group(tpg_ci),
                struct se_portal_group, tpg_group);
    tf = se_tpg->se_tpg_wwn->wwn_tf;

    if (lun->lun_se_dev !=  NULL) {
        pr_err("Port Symlink already exists\n");
        return -EEXIST;
    }

    dev = se_dev->se_dev_ptr;
    if (!dev) {
        pr_err("Unable to locate struct se_device pointer from"
            " %s\n", config_item_name(se_dev_ci));
        ret = -ENODEV;
        goto out;
    }

    lun_p = core_dev_add_lun(se_tpg, dev, lun->unpacked_lun);
    if (IS_ERR(lun_p)) {
        pr_err("core_dev_add_lun() failed\n");
        ret = PTR_ERR(lun_p);
        goto out;
    }

    if (tf->tf_ops.fabric_post_link) {
        /*
         * Call the optional fabric_post_link() to allow a
         * fabric module to setup any additional state once
         * core_dev_add_lun() has been called..
         */
        tf->tf_ops.fabric_post_link(se_tpg, lun);
    }

    return 0;
out:
    return ret;
}

static int target_fabric_port_unlink(
    struct config_item *lun_ci,
    struct config_item *se_dev_ci)
{
    struct se_lun *lun = container_of(to_config_group(lun_ci),
                struct se_lun, lun_group);
    struct se_portal_group *se_tpg = lun->lun_sep->sep_tpg;
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;

    if (tf->tf_ops.fabric_pre_unlink) {
        /*
         * Call the optional fabric_pre_unlink() to allow a
         * fabric module to release any additional stat before
         * core_dev_del_lun() is called.
        */
        tf->tf_ops.fabric_pre_unlink(se_tpg, lun);
    }

    core_dev_del_lun(se_tpg, lun->unpacked_lun);
    return 0;
}

static struct configfs_item_operations target_fabric_port_item_ops = {
    .show_attribute     = target_fabric_port_attr_show,
    .store_attribute    = target_fabric_port_attr_store,
    .allow_link     = target_fabric_port_link,
    .drop_link      = target_fabric_port_unlink,
};

TF_CIT_SETUP(tpg_port, &target_fabric_port_item_ops, NULL, target_fabric_port_attrs);

/* End of tfc_tpg_port_cit */

/* Start of tfc_tpg_port_stat_cit */

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

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

static struct configfs_group_operations target_fabric_port_stat_group_ops = {
    .make_group     = target_core_port_stat_mkdir,
    .drop_item      = target_core_port_stat_rmdir,
};

TF_CIT_SETUP(tpg_port_stat, NULL, &target_fabric_port_stat_group_ops, NULL);

/* End of tfc_tpg_port_stat_cit */

/* Start of tfc_tpg_lun_cit */

static struct config_group *target_fabric_make_lun(
    struct config_group *group,
    const char *name)
{
    struct se_lun *lun;
    struct se_portal_group *se_tpg = container_of(group,
            struct se_portal_group, tpg_lun_group);
    struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
    struct config_group *lun_cg = NULL, *port_stat_grp = NULL;
    unsigned long unpacked_lun;
    int errno;

    if (strstr(name, "lun_") != name) {
        pr_err("Unable to locate \'_\" in"
                " \"lun_$LUN_NUMBER\"\n");
        return ERR_PTR(-EINVAL);
    }
    if (strict_strtoul(name + 4, 0, &unpacked_lun) || unpacked_lun > UINT_MAX)
        return ERR_PTR(-EINVAL);

    lun = core_get_lun_from_tpg(se_tpg, unpacked_lun);
    if (!lun)
        return ERR_PTR(-EINVAL);

    lun_cg = &lun->lun_group;
    lun_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
                GFP_KERNEL);
    if (!lun_cg->default_groups) {
        pr_err("Unable to allocate lun_cg->default_groups\n");
        return ERR_PTR(-ENOMEM);
    }

    config_group_init_type_name(&lun->lun_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_port_cit);
    config_group_init_type_name(&lun->port_stat_grps.stat_group,
            "statistics", &TF_CIT_TMPL(tf)->tfc_tpg_port_stat_cit);
    lun_cg->default_groups[0] = &lun->port_stat_grps.stat_group;
    lun_cg->default_groups[1] = NULL;

    port_stat_grp = &lun->port_stat_grps.stat_group;
    port_stat_grp->default_groups =  kzalloc(sizeof(struct config_group) * 3,
                GFP_KERNEL);
    if (!port_stat_grp->default_groups) {
        pr_err("Unable to allocate port_stat_grp->default_groups\n");
        errno = -ENOMEM;
        goto out;
    }
    target_stat_setup_port_default_groups(lun);

    return &lun->lun_group;
out:
    if (lun_cg)
        kfree(lun_cg->default_groups);
    return ERR_PTR(errno);
}

static void target_fabric_drop_lun(
    struct config_group *group,
    struct config_item *item)
{
    struct se_lun *lun = container_of(to_config_group(item),
                struct se_lun, lun_group);
    struct config_item *df_item;
    struct config_group *lun_cg, *port_stat_grp;
    int i;

    port_stat_grp = &lun->port_stat_grps.stat_group;
    for (i = 0; port_stat_grp->default_groups[i]; i++) {
        df_item = &port_stat_grp->default_groups[i]->cg_item;
        port_stat_grp->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    kfree(port_stat_grp->default_groups);

    lun_cg = &lun->lun_group;
    for (i = 0; lun_cg->default_groups[i]; i++) {
        df_item = &lun_cg->default_groups[i]->cg_item;
        lun_cg->default_groups[i] = NULL;
        config_item_put(df_item);
    }
    kfree(lun_cg->default_groups);

    config_item_put(item);
}

static struct configfs_group_operations target_fabric_lun_group_ops = {
    .make_group = &target_fabric_make_lun,
    .drop_item  = &target_fabric_drop_lun,
};

TF_CIT_SETUP(tpg_lun, NULL, &target_fabric_lun_group_ops, NULL);

/* End of tfc_tpg_lun_cit */

/* Start of tfc_tpg_attrib_cit */

CONFIGFS_EATTR_OPS(target_fabric_tpg_attrib, se_portal_group, tpg_attrib_group);

static struct configfs_item_operations target_fabric_tpg_attrib_item_ops = {
    .show_attribute     = target_fabric_tpg_attrib_attr_show,
    .store_attribute    = target_fabric_tpg_attrib_attr_store,
};

TF_CIT_SETUP(tpg_attrib, &target_fabric_tpg_attrib_item_ops, NULL, NULL);

/* End of tfc_tpg_attrib_cit */

/* Start of tfc_tpg_param_cit */

CONFIGFS_EATTR_OPS(target_fabric_tpg_param, se_portal_group, tpg_param_group);

static struct configfs_item_operations target_fabric_tpg_param_item_ops = {
    .show_attribute     = target_fabric_tpg_param_attr_show,
    .store_attribute    = target_fabric_tpg_param_attr_store,
};

TF_CIT_SETUP(tpg_param, &target_fabric_tpg_param_item_ops, NULL, NULL);

/* End of tfc_tpg_param_cit */

/* Start of tfc_tpg_base_cit */
/*
 * For use with TF_TPG_ATTR() and TF_TPG_ATTR_RO()
 */
CONFIGFS_EATTR_OPS(target_fabric_tpg, se_portal_group, tpg_group);

static void target_fabric_tpg_release(struct config_item *item)
{
    struct se_portal_group *se_tpg = container_of(to_config_group(item),
            struct se_portal_group, tpg_group);
    struct se_wwn *wwn = se_tpg->se_tpg_wwn;
    struct target_fabric_configfs *tf = wwn->wwn_tf;

    tf->tf_ops.fabric_drop_tpg(se_tpg);
}

static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
    .release        = target_fabric_tpg_release,
    .show_attribute     = target_fabric_tpg_attr_show,
    .store_attribute    = target_fabric_tpg_attr_store,
};

TF_CIT_SETUP(tpg_base, &target_fabric_tpg_base_item_ops, NULL, NULL);

/* End of tfc_tpg_base_cit */

/* Start of tfc_tpg_cit */

static struct config_group *target_fabric_make_tpg(
    struct config_group *group,
    const char *name)
{
    struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
    struct target_fabric_configfs *tf = wwn->wwn_tf;
    struct se_portal_group *se_tpg;

    if (!tf->tf_ops.fabric_make_tpg) {
        pr_err("tf->tf_ops.fabric_make_tpg is NULL\n");
        return ERR_PTR(-ENOSYS);
    }

    se_tpg = tf->tf_ops.fabric_make_tpg(wwn, group, name);
    if (!se_tpg || IS_ERR(se_tpg))
        return ERR_PTR(-EINVAL);
    /*
     * Setup default groups from pre-allocated se_tpg->tpg_default_groups
     */
    se_tpg->tpg_group.default_groups = se_tpg->tpg_default_groups;
    se_tpg->tpg_group.default_groups[0] = &se_tpg->tpg_lun_group;
    se_tpg->tpg_group.default_groups[1] = &se_tpg->tpg_np_group;
    se_tpg->tpg_group.default_groups[2] = &se_tpg->tpg_acl_group;
    se_tpg->tpg_group.default_groups[3] = &se_tpg->tpg_attrib_group;
    se_tpg->tpg_group.default_groups[4] = &se_tpg->tpg_param_group;
    se_tpg->tpg_group.default_groups[5] = NULL;

    config_group_init_type_name(&se_tpg->tpg_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_base_cit);
    config_group_init_type_name(&se_tpg->tpg_lun_group, "lun",
            &TF_CIT_TMPL(tf)->tfc_tpg_lun_cit);
    config_group_init_type_name(&se_tpg->tpg_np_group, "np",
            &TF_CIT_TMPL(tf)->tfc_tpg_np_cit);
    config_group_init_type_name(&se_tpg->tpg_acl_group, "acls",
            &TF_CIT_TMPL(tf)->tfc_tpg_nacl_cit);
    config_group_init_type_name(&se_tpg->tpg_attrib_group, "attrib",
            &TF_CIT_TMPL(tf)->tfc_tpg_attrib_cit);
    config_group_init_type_name(&se_tpg->tpg_param_group, "param",
            &TF_CIT_TMPL(tf)->tfc_tpg_param_cit);

    return &se_tpg->tpg_group;
}

static void target_fabric_drop_tpg(
    struct config_group *group,
    struct config_item *item)
{
    struct se_portal_group *se_tpg = container_of(to_config_group(item),
                struct se_portal_group, tpg_group);
    struct config_group *tpg_cg = &se_tpg->tpg_group;
    struct config_item *df_item;
    int i;
    /*
     * Release default groups, but do not release tpg_cg->default_groups
     * memory as it is statically allocated at se_tpg->tpg_default_groups.
     */
    for (i = 0; tpg_cg->default_groups[i]; i++) {
        df_item = &tpg_cg->default_groups[i]->cg_item;
        tpg_cg->default_groups[i] = NULL;
        config_item_put(df_item);
    }

    config_item_put(item);
}

static void target_fabric_release_wwn(struct config_item *item)
{
    struct se_wwn *wwn = container_of(to_config_group(item),
                struct se_wwn, wwn_group);
    struct target_fabric_configfs *tf = wwn->wwn_tf;

    tf->tf_ops.fabric_drop_wwn(wwn);
}

static struct configfs_item_operations target_fabric_tpg_item_ops = {
    .release    = target_fabric_release_wwn,
};

static struct configfs_group_operations target_fabric_tpg_group_ops = {
    .make_group = target_fabric_make_tpg,
    .drop_item  = target_fabric_drop_tpg,
};

TF_CIT_SETUP(tpg, &target_fabric_tpg_item_ops, &target_fabric_tpg_group_ops,
        NULL);

/* End of tfc_tpg_cit */

/* Start of tfc_wwn_fabric_stats_cit */
/*
 * This is used as a placeholder for struct se_wwn->fabric_stat_group
 * to allow fabrics access to ->fabric_stat_group->default_groups[]
 */
TF_CIT_SETUP(wwn_fabric_stats, NULL, NULL, NULL);

/* End of tfc_wwn_fabric_stats_cit */

/* Start of tfc_wwn_cit */

static struct config_group *target_fabric_make_wwn(
    struct config_group *group,
    const char *name)
{
    struct target_fabric_configfs *tf = container_of(group,
                struct target_fabric_configfs, tf_group);
    struct se_wwn *wwn;

    if (!tf->tf_ops.fabric_make_wwn) {
        pr_err("tf->tf_ops.fabric_make_wwn is NULL\n");
        return ERR_PTR(-ENOSYS);
    }

    wwn = tf->tf_ops.fabric_make_wwn(tf, group, name);
    if (!wwn || IS_ERR(wwn))
        return ERR_PTR(-EINVAL);

    wwn->wwn_tf = tf;
    /*
     * Setup default groups from pre-allocated wwn->wwn_default_groups
     */
    wwn->wwn_group.default_groups = wwn->wwn_default_groups;
    wwn->wwn_group.default_groups[0] = &wwn->fabric_stat_group;
    wwn->wwn_group.default_groups[1] = NULL;

    config_group_init_type_name(&wwn->wwn_group, name,
            &TF_CIT_TMPL(tf)->tfc_tpg_cit);
    config_group_init_type_name(&wwn->fabric_stat_group, "fabric_statistics",
            &TF_CIT_TMPL(tf)->tfc_wwn_fabric_stats_cit);

    return &wwn->wwn_group;
}

static void target_fabric_drop_wwn(
    struct config_group *group,
    struct config_item *item)
{
    struct se_wwn *wwn = container_of(to_config_group(item),
                struct se_wwn, wwn_group);
    struct config_item *df_item;
    struct config_group *cg = &wwn->wwn_group;
    int i;

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

    config_item_put(item);
}

static struct configfs_group_operations target_fabric_wwn_group_ops = {
    .make_group = target_fabric_make_wwn,
    .drop_item  = target_fabric_drop_wwn,
};
/*
 * For use with TF_WWN_ATTR() and TF_WWN_ATTR_RO()
 */
CONFIGFS_EATTR_OPS(target_fabric_wwn, target_fabric_configfs, tf_group);

static struct configfs_item_operations target_fabric_wwn_item_ops = {
    .show_attribute     = target_fabric_wwn_attr_show,
    .store_attribute    = target_fabric_wwn_attr_store,
};

TF_CIT_SETUP(wwn, &target_fabric_wwn_item_ops, &target_fabric_wwn_group_ops, NULL);

/* End of tfc_wwn_cit */

/* Start of tfc_discovery_cit */

CONFIGFS_EATTR_OPS(target_fabric_discovery, target_fabric_configfs,
        tf_disc_group);

static struct configfs_item_operations target_fabric_discovery_item_ops = {
    .show_attribute     = target_fabric_discovery_attr_show,
    .store_attribute    = target_fabric_discovery_attr_store,
};

TF_CIT_SETUP(discovery, &target_fabric_discovery_item_ops, NULL, NULL);

/* End of tfc_discovery_cit */

int target_fabric_setup_cits(struct target_fabric_configfs *tf)
{
    target_fabric_setup_discovery_cit(tf);
    target_fabric_setup_wwn_cit(tf);
    target_fabric_setup_wwn_fabric_stats_cit(tf);
    target_fabric_setup_tpg_cit(tf);
    target_fabric_setup_tpg_base_cit(tf);
    target_fabric_setup_tpg_port_cit(tf);
    target_fabric_setup_tpg_port_stat_cit(tf);
    target_fabric_setup_tpg_lun_cit(tf);
    target_fabric_setup_tpg_np_cit(tf);
    target_fabric_setup_tpg_np_base_cit(tf);
    target_fabric_setup_tpg_attrib_cit(tf);
    target_fabric_setup_tpg_param_cit(tf);
    target_fabric_setup_tpg_nacl_cit(tf);
    target_fabric_setup_tpg_nacl_base_cit(tf);
    target_fabric_setup_tpg_nacl_attrib_cit(tf);
    target_fabric_setup_tpg_nacl_auth_cit(tf);
    target_fabric_setup_tpg_nacl_param_cit(tf);
    target_fabric_setup_tpg_nacl_stat_cit(tf);
    target_fabric_setup_tpg_mappedlun_cit(tf);
    target_fabric_setup_tpg_mappedlun_stat_cit(tf);

    return 0;
}