path: root/drivers/target/target_core_fabric_configfs.c

/*******************************************************************************
* 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 <nab@linux-iscsi.org>
*
 * 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/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 =