1/*******************************************************************************
   2 * Filename:  target_core_configfs.c
   3 *
   4 * This file contains ConfigFS logic for the Generic Target Engine project.
   5 *
   6 * Copyright (c) 2008-2011 Rising Tide Systems
   7 * Copyright (c) 2008-2011 Linux-iSCSI.org
   8 *
   9 * Nicholas A. Bellinger <nab@kernel.org>
  10 *
  11 * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 ****************************************************************************/
  23
  24#include <linux/module.h>
  25#include <linux/moduleparam.h>
  26#include <generated/utsrelease.h>
  27#include <linux/utsname.h>
  28#include <linux/init.h>
  29#include <linux/fs.h>
  30#include <linux/namei.h>
  31#include <linux/slab.h>
  32#include <linux/types.h>
  33#include <linux/delay.h>
  34#include <linux/unistd.h>
  35#include <linux/string.h>
  36#include <linux/parser.h>
  37#include <linux/syscalls.h>
  38#include <linux/configfs.h>
  39#include <linux/spinlock.h>
  40
  41#include <target/target_core_base.h>
  42#include <target/target_core_backend.h>
  43#include <target/target_core_fabric.h>
  44#include <target/target_core_fabric_configfs.h>
  45#include <target/target_core_configfs.h>
  46#include <target/configfs_macros.h>
  47
  48#include "target_core_internal.h"
  49#include "target_core_alua.h"
  50#include "target_core_pr.h"
  51#include "target_core_rd.h"
  52
  53extern struct t10_alua_lu_gp *default_lu_gp;
  54
  55static LIST_HEAD(g_tf_list);
  56static DEFINE_MUTEX(g_tf_lock);
  57
  58struct target_core_configfs_attribute {
  59	struct configfs_attribute attr;
  60	ssize_t (*show)(void *, char *);
  61	ssize_t (*store)(void *, const char *, size_t);
  62};
  63
  64static struct config_group target_core_hbagroup;
  65static struct config_group alua_group;
  66static struct config_group alua_lu_gps_group;
  67
  68static inline struct se_hba *
  69item_to_hba(struct config_item *item)
  70{
  71	return container_of(to_config_group(item), struct se_hba, hba_group);
  72}
  73
  74/*
  75 * Attributes for /sys/kernel/config/target/
  76 */
  77static ssize_t target_core_attr_show(struct config_item *item,
  78				      struct configfs_attribute *attr,
  79				      char *page)
  80{
  81	return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  82		" on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
  83		utsname()->sysname, utsname()->machine);
  84}
  85
  86static struct configfs_item_operations target_core_fabric_item_ops = {
  87	.show_attribute = target_core_attr_show,
  88};
  89
  90static struct configfs_attribute target_core_item_attr_version = {
  91	.ca_owner	= THIS_MODULE,
  92	.ca_name	= "version",
  93	.ca_mode	= S_IRUGO,
  94};
  95
  96static struct target_fabric_configfs *target_core_get_fabric(
  97	const char *name)
  98{
  99	struct target_fabric_configfs *tf;
 100
 101	if (!name)
 102		return NULL;
 103
 104	mutex_lock(&g_tf_lock);
 105	list_for_each_entry(tf, &g_tf_list, tf_list) {
 106		if (!strcmp(tf->tf_name, name)) {
 107			atomic_inc(&tf->tf_access_cnt);
 108			mutex_unlock(&g_tf_lock);
 109			return tf;
 110		}
 111	}
 112	mutex_unlock(&g_tf_lock);
 113
 114	return NULL;
 115}
 116
 117/*
 118 * Called from struct target_core_group_ops->make_group()
 119 */
 120static struct config_group *target_core_register_fabric(
 121	struct config_group *group,
 122	const char *name)
 123{
 124	struct target_fabric_configfs *tf;
 125	int ret;
 126
 127	pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 128			" %s\n", group, name);
 129	/*
 130	 * Below are some hardcoded request_module() calls to automatically
 131	 * local fabric modules when the following is called:
 132	 *
 133	 * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 134	 *
 135	 * Note that this does not limit which TCM fabric module can be
 136	 * registered, but simply provids auto loading logic for modules with
 137	 * mkdir(2) system calls with known TCM fabric modules.
 138	 */
 139	if (!strncmp(name, "iscsi", 5)) {
 140		/*
 141		 * Automatically load the LIO Target fabric module when the
 142		 * following is called:
 143		 *
 144		 * mkdir -p $CONFIGFS/target/iscsi
 145		 */
 146		ret = request_module("iscsi_target_mod");
 147		if (ret < 0) {
 148			pr_err("request_module() failed for"
 149				" iscsi_target_mod.ko: %d\n", ret);
 150			return ERR_PTR(-EINVAL);
 151		}
 152	} else if (!strncmp(name, "loopback", 8)) {
 153		/*
 154		 * Automatically load the tcm_loop fabric module when the
 155		 * following is called:
 156		 *
 157		 * mkdir -p $CONFIGFS/target/loopback
 158		 */
 159		ret = request_module("tcm_loop");
 160		if (ret < 0) {
 161			pr_err("request_module() failed for"
 162				" tcm_loop.ko: %d\n", ret);
 163			return ERR_PTR(-EINVAL);
 164		}
 165	}
 166
 167	tf = target_core_get_fabric(name);
 168	if (!tf) {
 169		pr_err("target_core_get_fabric() failed for %s\n",
 170			name);
 171		return ERR_PTR(-EINVAL);
 172	}
 173	pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 174			" %s\n", tf->tf_name);
 175	/*
 176	 * On a successful target_core_get_fabric() look, the returned
 177	 * struct target_fabric_configfs *tf will contain a usage reference.
 178	 */
 179	pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 180			&TF_CIT_TMPL(tf)->tfc_wwn_cit);
 181
 182	tf->tf_group.default_groups = tf->tf_default_groups;
 183	tf->tf_group.default_groups[0] = &tf->tf_disc_group;
 184	tf->tf_group.default_groups[1] = NULL;
 185
 186	config_group_init_type_name(&tf->tf_group, name,
 187			&TF_CIT_TMPL(tf)->tfc_wwn_cit);
 188	config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 189			&TF_CIT_TMPL(tf)->tfc_discovery_cit);
 190
 191	pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 192			" %s\n", tf->tf_group.cg_item.ci_name);
 193	/*
 194	 * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
 195	 */
 196	tf->tf_ops.tf_subsys = tf->tf_subsys;
 197	tf->tf_fabric = &tf->tf_group.cg_item;
 198	pr_debug("Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
 199			" for %s\n", name);
 200
 201	return &tf->tf_group;
 202}
 203
 204/*
 205 * Called from struct target_core_group_ops->drop_item()
 206 */
 207static void target_core_deregister_fabric(
 208	struct config_group *group,
 209	struct config_item *item)
 210{
 211	struct target_fabric_configfs *tf = container_of(
 212		to_config_group(item), struct target_fabric_configfs, tf_group);
 213	struct config_group *tf_group;
 214	struct config_item *df_item;
 215	int i;
 216
 217	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 218		" tf list\n", config_item_name(item));
 219
 220	pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 221			" %s\n", tf->tf_name);
 222	atomic_dec(&tf->tf_access_cnt);
 223
 224	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing"
 225			" tf->tf_fabric for %s\n", tf->tf_name);
 226	tf->tf_fabric = NULL;
 227
 228	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 229			" %s\n", config_item_name(item));
 230
 231	tf_group = &tf->tf_group;
 232	for (i = 0; tf_group->default_groups[i]; i++) {
 233		df_item = &tf_group->default_groups[i]->cg_item;
 234		tf_group->default_groups[i] = NULL;
 235		config_item_put(df_item);
 236	}
 237	config_item_put(item);
 238}
 239
 240static struct configfs_group_operations target_core_fabric_group_ops = {
 241	.make_group	= &target_core_register_fabric,
 242	.drop_item	= &target_core_deregister_fabric,
 243};
 244
 245/*
 246 * All item attributes appearing in /sys/kernel/target/ appear here.
 247 */
 248static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 249	&target_core_item_attr_version,
 250	NULL,
 251};
 252
 253/*
 254 * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 255 */
 256static struct config_item_type target_core_fabrics_item = {
 257	.ct_item_ops	= &target_core_fabric_item_ops,
 258	.ct_group_ops	= &target_core_fabric_group_ops,
 259	.ct_attrs	= target_core_fabric_item_attrs,
 260	.ct_owner	= THIS_MODULE,
 261};
 262
 263static struct configfs_subsystem target_core_fabrics = {
 264	.su_group = {
 265		.cg_item = {
 266			.ci_namebuf = "target",
 267			.ci_type = &target_core_fabrics_item,
 268		},
 269	},
 270};
 271
 272static struct configfs_subsystem *target_core_subsystem[] = {
 273	&target_core_fabrics,
 274	NULL,
 275};
 276
 277/*##############################################################################
 278// Start functions called by external Target Fabrics Modules
 279//############################################################################*/
 280
 281/*
 282 * First function called by fabric modules to:
 283 *
 284 * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
 285 * 2) Add struct target_fabric_configfs to g_tf_list
 286 * 3) Return struct target_fabric_configfs to fabric module to be passed
 287 *    into target_fabric_configfs_register().
 288 */
 289struct target_fabric_configfs *target_fabric_configfs_init(
 290	struct module *fabric_mod,
 291	const char *name)
 292{
 293	struct target_fabric_configfs *tf;
 294
 295	if (!(name)) {
 296		pr_err("Unable to locate passed fabric name\n");
 297		return ERR_PTR(-EINVAL);
 298	}
 299	if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
 300		pr_err("Passed name: %s exceeds TARGET_FABRIC"
 301			"_NAME_SIZE\n", name);
 302		return ERR_PTR(-EINVAL);
 303	}
 304
 305	tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 306	if (!tf)
 307		return ERR_PTR(-ENOMEM);
 308
 309	INIT_LIST_HEAD(&tf->tf_list);
 310	atomic_set(&tf->tf_access_cnt, 0);
 311	/*
 312	 * Setup the default generic struct config_item_type's (cits) in
 313	 * struct target_fabric_configfs->tf_cit_tmpl
 314	 */
 315	tf->tf_module = fabric_mod;
 316	target_fabric_setup_cits(tf);
 317
 318	tf->tf_subsys = target_core_subsystem[0];
 319	snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
 320
 321	mutex_lock(&g_tf_lock);
 322	list_add_tail(&tf->tf_list, &g_tf_list);
 323	mutex_unlock(&g_tf_lock);
 324
 325	pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
 326			">>>>>>>>>>>>>>\n");
 327	pr_debug("Initialized struct target_fabric_configfs: %p for"
 328			" %s\n", tf, tf->tf_name);
 329	return tf;
 330}
 331EXPORT_SYMBOL(target_fabric_configfs_init);
 332
 333/*
 334 * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
 335 */
 336void target_fabric_configfs_free(
 337	struct target_fabric_configfs *tf)
 338{
 339	mutex_lock(&g_tf_lock);
 340	list_del(&tf->tf_list);
 341	mutex_unlock(&g_tf_lock);
 342
 343	kfree(tf);
 344}
 345EXPORT_SYMBOL(target_fabric_configfs_free);
 346
 347/*
 348 * Perform a sanity check of the passed tf->tf_ops before completing
 349 * TCM fabric module registration.
 350 */
 351static int target_fabric_tf_ops_check(
 352	struct target_fabric_configfs *tf)
 353{
 354	struct target_core_fabric_ops *tfo = &tf->tf_ops;
 355
 356	if (!tfo->get_fabric_name) {
 357		pr_err("Missing tfo->get_fabric_name()\n");
 358		return -EINVAL;
 359	}
 360	if (!tfo->get_fabric_proto_ident) {
 361		pr_err("Missing tfo->get_fabric_proto_ident()\n");
 362		return -EINVAL;
 363	}
 364	if (!tfo->tpg_get_wwn) {
 365		pr_err("Missing tfo->tpg_get_wwn()\n");
 366		return -EINVAL;
 367	}
 368	if (!tfo->tpg_get_tag) {
 369		pr_err("Missing tfo->tpg_get_tag()\n");
 370		return -EINVAL;
 371	}
 372	if (!tfo->tpg_get_default_depth) {
 373		pr_err("Missing tfo->tpg_get_default_depth()\n");
 374		return -EINVAL;
 375	}
 376	if (!tfo->tpg_get_pr_transport_id) {
 377		pr_err("Missing tfo->tpg_get_pr_transport_id()\n");
 378		return -EINVAL;
 379	}
 380	if (!tfo->tpg_get_pr_transport_id_len) {
 381		pr_err("Missing tfo->tpg_get_pr_transport_id_len()\n");
 382		return -EINVAL;
 383	}
 384	if (!tfo->tpg_check_demo_mode) {
 385		pr_err("Missing tfo->tpg_check_demo_mode()\n");
 386		return -EINVAL;
 387	}
 388	if (!tfo->tpg_check_demo_mode_cache) {
 389		pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 390		return -EINVAL;
 391	}
 392	if (!tfo->tpg_check_demo_mode_write_protect) {
 393		pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 394		return -EINVAL;
 395	}
 396	if (!tfo->tpg_check_prod_mode_write_protect) {
 397		pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 398		return -EINVAL;
 399	}
 400	if (!tfo->tpg_alloc_fabric_acl) {
 401		pr_err("Missing tfo->tpg_alloc_fabric_acl()\n");
 402		return -EINVAL;
 403	}
 404	if (!tfo->tpg_release_fabric_acl) {
 405		pr_err("Missing tfo->tpg_release_fabric_acl()\n");
 406		return -EINVAL;
 407	}
 408	if (!tfo->tpg_get_inst_index) {
 409		pr_err("Missing tfo->tpg_get_inst_index()\n");
 410		return -EINVAL;
 411	}
 412	if (!tfo->release_cmd) {
 413		pr_err("Missing tfo->release_cmd()\n");
 414		return -EINVAL;
 415	}
 416	if (!tfo->shutdown_session) {
 417		pr_err("Missing tfo->shutdown_session()\n");
 418		return -EINVAL;
 419	}
 420	if (!tfo->close_session) {
 421		pr_err("Missing tfo->close_session()\n");
 422		return -EINVAL;
 423	}
 424	if (!tfo->sess_get_index) {
 425		pr_err("Missing tfo->sess_get_index()\n");
 426		return -EINVAL;
 427	}
 428	if (!tfo->write_pending) {
 429		pr_err("Missing tfo->write_pending()\n");
 430		return -EINVAL;
 431	}
 432	if (!tfo->write_pending_status) {
 433		pr_err("Missing tfo->write_pending_status()\n");
 434		return -EINVAL;
 435	}
 436	if (!tfo->set_default_node_attributes) {
 437		pr_err("Missing tfo->set_default_node_attributes()\n");
 438		return -EINVAL;
 439	}
 440	if (!tfo->get_task_tag) {
 441		pr_err("Missing tfo->get_task_tag()\n");
 442		return -EINVAL;
 443	}
 444	if (!tfo->get_cmd_state) {
 445		pr_err("Missing tfo->get_cmd_state()\n");
 446		return -EINVAL;
 447	}
 448	if (!tfo->queue_data_in) {
 449		pr_err("Missing tfo->queue_data_in()\n");
 450		return -EINVAL;
 451	}
 452	if (!tfo->queue_status) {
 453		pr_err("Missing tfo->queue_status()\n");
 454		return -EINVAL;
 455	}
 456	if (!tfo->queue_tm_rsp) {
 457		pr_err("Missing tfo->queue_tm_rsp()\n");
 458		return -EINVAL;
 459	}
 460	if (!tfo->set_fabric_sense_len) {
 461		pr_err("Missing tfo->set_fabric_sense_len()\n");
 462		return -EINVAL;
 463	}
 464	if (!tfo->get_fabric_sense_len) {
 465		pr_err("Missing tfo->get_fabric_sense_len()\n");
 466		return -EINVAL;
 467	}
 468	/*
 469	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 470	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 471	 * target_core_fabric_configfs.c WWN+TPG group context code.
 472	 */
 473	if (!tfo->fabric_make_wwn) {
 474		pr_err("Missing tfo->fabric_make_wwn()\n");
 475		return -EINVAL;
 476	}
 477	if (!tfo->fabric_drop_wwn) {
 478		pr_err("Missing tfo->fabric_drop_wwn()\n");
 479		return -EINVAL;
 480	}
 481	if (!tfo->fabric_make_tpg) {
 482		pr_err("Missing tfo->fabric_make_tpg()\n");
 483		return -EINVAL;
 484	}
 485	if (!tfo->fabric_drop_tpg) {
 486		pr_err("Missing tfo->fabric_drop_tpg()\n");
 487		return -EINVAL;
 488	}
 489
 490	return 0;
 491}
 492
 493/*
 494 * Called 2nd from fabric module with returned parameter of
 495 * struct target_fabric_configfs * from target_fabric_configfs_init().
 496 *
 497 * Upon a successful registration, the new fabric's struct config_item is
 498 * return.  Also, a pointer to this struct is set in the passed
 499 * struct target_fabric_configfs.
 500 */
 501int target_fabric_configfs_register(
 502	struct target_fabric_configfs *tf)
 503{
 504	int ret;
 505
 506	if (!tf) {
 507		pr_err("Unable to locate target_fabric_configfs"
 508			" pointer\n");
 509		return -EINVAL;
 510	}
 511	if (!tf->tf_subsys) {
 512		pr_err("Unable to target struct config_subsystem"
 513			" pointer\n");
 514		return -EINVAL;
 515	}
 516	ret = target_fabric_tf_ops_check(tf);
 517	if (ret < 0)
 518		return ret;
 519
 520	pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
 521		">>>>>>>>>>\n");
 522	return 0;
 523}
 524EXPORT_SYMBOL(target_fabric_configfs_register);
 525
 526void target_fabric_configfs_deregister(
 527	struct target_fabric_configfs *tf)
 528{
 529	struct configfs_subsystem *su;
 530
 531	if (!tf) {
 532		pr_err("Unable to locate passed target_fabric_"
 533			"configfs\n");
 534		return;
 535	}
 536	su = tf->tf_subsys;
 537	if (!su) {
 538		pr_err("Unable to locate passed tf->tf_subsys"
 539			" pointer\n");
 540		return;
 541	}
 542	pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
 543			">>>>>>>>>>>>\n");
 544	mutex_lock(&g_tf_lock);
 545	if (atomic_read(&tf->tf_access_cnt)) {
 546		mutex_unlock(&g_tf_lock);
 547		pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
 548			tf->tf_name);
 549		BUG();
 550	}
 551	list_del(&tf->tf_list);
 552	mutex_unlock(&g_tf_lock);
 553
 554	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
 555			" %s\n", tf->tf_name);
 556	tf->tf_module = NULL;
 557	tf->tf_subsys = NULL;
 558	kfree(tf);
 559
 560	pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
 561			">>>>>\n");
 562}
 563EXPORT_SYMBOL(target_fabric_configfs_deregister);
 564
 565/*##############################################################################
 566// Stop functions called by external Target Fabrics Modules
 567//############################################################################*/
 568
 569/* Start functions for struct config_item_type target_core_dev_attrib_cit */
 570
 571#define DEF_DEV_ATTRIB_SHOW(_name)					\
 572static ssize_t target_core_dev_show_attr_##_name(			\
 573	struct se_dev_attrib *da,					\
 574	char *page)							\
 575{									\
 576	struct se_device *dev;						\
 577	struct se_subsystem_dev *se_dev = da->da_sub_dev;			\
 578	ssize_t rb;							\
 579									\
 580	spin_lock(&se_dev->se_dev_lock);				\
 581	dev = se_dev->se_dev_ptr;					\
 582	if (!dev) {							\
 583		spin_unlock(&se_dev->se_dev_lock); 			\
 584		return -ENODEV;						\
 585	}								\
 586	rb = snprintf(page, PAGE_SIZE, "%u\n",				\
 587		(u32)dev->se_sub_dev->se_dev_attrib._name);		\
 588	spin_unlock(&se_dev->se_dev_lock);				\
 589									\
 590	return rb;							\
 591}
 592
 593#define DEF_DEV_ATTRIB_STORE(_name)					\
 594static ssize_t target_core_dev_store_attr_##_name(			\
 595	struct se_dev_attrib *da,					\
 596	const char *page,						\
 597	size_t count)							\
 598{									\
 599	struct se_device *dev;						\
 600	struct se_subsystem_dev *se_dev = da->da_sub_dev;			\
 601	unsigned long val;						\
 602	int ret;							\
 603									\
 604	spin_lock(&se_dev->se_dev_lock);				\
 605	dev = se_dev->se_dev_ptr;					\
 606	if (!dev) {							\
 607		spin_unlock(&se_dev->se_dev_lock);			\
 608		return -ENODEV;						\
 609	}								\
 610	ret = strict_strtoul(page, 0, &val);				\
 611	if (ret < 0) {							\
 612		spin_unlock(&se_dev->se_dev_lock);                      \
 613		pr_err("strict_strtoul() failed with"		\
 614			" ret: %d\n", ret);				\
 615		return -EINVAL;						\
 616	}								\
 617	ret = se_dev_set_##_name(dev, (u32)val);			\
 618	spin_unlock(&se_dev->se_dev_lock);				\
 619									\
 620	return (!ret) ? count : -EINVAL;				\
 621}
 622
 623#define DEF_DEV_ATTRIB(_name)						\
 624DEF_DEV_ATTRIB_SHOW(_name);						\
 625DEF_DEV_ATTRIB_STORE(_name);
 626
 627#define DEF_DEV_ATTRIB_RO(_name)					\
 628DEF_DEV_ATTRIB_SHOW(_name);
 629
 630CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
 631#define SE_DEV_ATTR(_name, _mode)					\
 632static struct target_core_dev_attrib_attribute				\
 633			target_core_dev_attrib_##_name =		\
 634		__CONFIGFS_EATTR(_name, _mode,				\
 635		target_core_dev_show_attr_##_name,			\
 636		target_core_dev_store_attr_##_name);
 637
 638#define SE_DEV_ATTR_RO(_name);						\
 639static struct target_core_dev_attrib_attribute				\
 640			target_core_dev_attrib_##_name =		\
 641	__CONFIGFS_EATTR_RO(_name,					\
 642	target_core_dev_show_attr_##_name);
 643
 644DEF_DEV_ATTRIB(emulate_dpo);
 645SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
 646
 647DEF_DEV_ATTRIB(emulate_fua_write);
 648SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);
 649
 650DEF_DEV_ATTRIB(emulate_fua_read);
 651SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);
 652
 653DEF_DEV_ATTRIB(emulate_write_cache);
 654SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);
 655
 656DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
 657SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
 658
 659DEF_DEV_ATTRIB(emulate_tas);
 660SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
 661
 662DEF_DEV_ATTRIB(emulate_tpu);
 663SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
 664
 665DEF_DEV_ATTRIB(emulate_tpws);
 666SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
 667
 668DEF_DEV_ATTRIB(enforce_pr_isids);
 669SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
 670
 671DEF_DEV_ATTRIB(is_nonrot);
 672SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
 673
 674DEF_DEV_ATTRIB(emulate_rest_reord);
 675SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);
 676
 677DEF_DEV_ATTRIB_RO(hw_block_size);
 678SE_DEV_ATTR_RO(hw_block_size);
 679
 680DEF_DEV_ATTRIB(block_size);
 681SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
 682
 683DEF_DEV_ATTRIB_RO(hw_max_sectors);
 684SE_DEV_ATTR_RO(hw_max_sectors);
 685
 686DEF_DEV_ATTRIB(fabric_max_sectors);
 687SE_DEV_ATTR(fabric_max_sectors, S_IRUGO | S_IWUSR);
 688
 689DEF_DEV_ATTRIB(optimal_sectors);
 690SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);
 691
 692DEF_DEV_ATTRIB_RO(hw_queue_depth);
 693SE_DEV_ATTR_RO(hw_queue_depth);
 694
 695DEF_DEV_ATTRIB(queue_depth);
 696SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
 697
 698DEF_DEV_ATTRIB(max_unmap_lba_count);
 699SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
 700
 701DEF_DEV_ATTRIB(max_unmap_block_desc_count);
 702SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);
 703
 704DEF_DEV_ATTRIB(unmap_granularity);
 705SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
 706
 707DEF_DEV_ATTRIB(unmap_granularity_alignment);
 708SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
 709
 710CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
 711
 712static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
 713	&target_core_dev_attrib_emulate_dpo.attr,
 714	&target_core_dev_attrib_emulate_fua_write.attr,
 715	&target_core_dev_attrib_emulate_fua_read.attr,
 716	&target_core_dev_attrib_emulate_write_cache.attr,
 717	&target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
 718	&target_core_dev_attrib_emulate_tas.attr,
 719	&target_core_dev_attrib_emulate_tpu.attr,
 720	&target_core_dev_attrib_emulate_tpws.attr,
 721	&target_core_dev_attrib_enforce_pr_isids.attr,
 722	&target_core_dev_attrib_is_nonrot.attr,
 723	&target_core_dev_attrib_emulate_rest_reord.attr,
 724	&target_core_dev_attrib_hw_block_size.attr,
 725	&target_core_dev_attrib_block_size.attr,
 726	&target_core_dev_attrib_hw_max_sectors.attr,
 727	&target_core_dev_attrib_fabric_max_sectors.attr,
 728	&target_core_dev_attrib_optimal_sectors.attr,
 729	&target_core_dev_attrib_hw_queue_depth.attr,
 730	&target_core_dev_attrib_queue_depth.attr,
 731	&target_core_dev_attrib_max_unmap_lba_count.attr,
 732	&target_core_dev_attrib_max_unmap_block_desc_count.attr,
 733	&target_core_dev_attrib_unmap_granularity.attr,
 734	&target_core_dev_attrib_unmap_granularity_alignment.attr,
 735	NULL,
 736};
 737
 738static struct configfs_item_operations target_core_dev_attrib_ops = {
 739	.show_attribute		= target_core_dev_attrib_attr_show,
 740	.store_attribute	= target_core_dev_attrib_attr_store,
 741};
 742
 743static struct config_item_type target_core_dev_attrib_cit = {
 744	.ct_item_ops		= &target_core_dev_attrib_ops,
 745	.ct_attrs		= target_core_dev_attrib_attrs,
 746	.ct_owner		= THIS_MODULE,
 747};
 748
 749/* End functions for struct config_item_type target_core_dev_attrib_cit */
 750
 751/*  Start functions for struct config_item_type target_core_dev_wwn_cit */
 752
 753CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
 754#define SE_DEV_WWN_ATTR(_name, _mode)					\
 755static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
 756		__CONFIGFS_EATTR(_name, _mode,				\
 757		target_core_dev_wwn_show_attr_##_name,			\
 758		target_core_dev_wwn_store_attr_##_name);
 759
 760#define SE_DEV_WWN_ATTR_RO(_name);					\
 761do {									\
 762	static struct target_core_dev_wwn_attribute			\
 763			target_core_dev_wwn_##_name =			\
 764		__CONFIGFS_EATTR_RO(_name,				\
 765		target_core_dev_wwn_show_attr_##_name);			\
 766} while (0);
 767
 768/*
 769 * VPD page 0x80 Unit serial
 770 */
 771static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
 772	struct t10_wwn *t10_wwn,
 773	char *page)
 774{
 775	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 776	struct se_device *dev;
 777
 778	dev = se_dev->se_dev_ptr;
 779	if (!dev)
 780		return -ENODEV;
 781
 782	return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
 783		&t10_wwn->unit_serial[0]);
 784}
 785
 786static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
 787	struct t10_wwn *t10_wwn,
 788	const char *page,
 789	size_t count)
 790{
 791	struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
 792	struct se_device *dev;
 793	unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
 794
 795	/*
 796	 * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
 797	 * from the struct scsi_device level firmware, do not allow
 798	 * VPD Unit Serial to be emulated.
 799	 *
 800	 * Note this struct scsi_device could also be emulating VPD
 801	 * information from its drivers/scsi LLD.  But for now we assume
 802	 * it is doing 'the right thing' wrt a world wide unique
 803	 * VPD Unit Serial Number that OS dependent multipath can depend on.
 804	 */
 805	if (su_dev->su_dev_flags & SDF_FIRMWARE_VPD_UNIT_SERIAL) {
 806		pr_err("Underlying SCSI device firmware provided VPD"
 807			" Unit Serial, ignoring request\n");
 808		return -EOPNOTSUPP;
 809	}
 810
 811	if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
 812		pr_err("Emulated VPD Unit Serial exceeds"
 813		" INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
 814		return -EOVERFLOW;
 815	}
 816	/*
 817	 * Check to see if any active $FABRIC_MOD exports exist.  If they
 818	 * do exist, fail here as changing this information on the fly
 819	 * (underneath the initiator side OS dependent multipath code)
 820	 * could cause negative effects.
 821	 */
 822	dev = su_dev->se_dev_ptr;
 823	if (dev) {
 824		if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
 825			pr_err("Unable to set VPD Unit Serial while"
 826				" active %d $FABRIC_MOD exports exist\n",
 827				atomic_read(&dev->dev_export_obj.obj_access_count));
 828			return -EINVAL;
 829		}
 830	}
 831	/*
 832	 * This currently assumes ASCII encoding for emulated VPD Unit Serial.
 833	 *
 834	 * Also, strip any newline added from the userspace
 835	 * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
 836	 */
 837	memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
 838	snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
 839	snprintf(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
 840			"%s", strstrip(buf));
 841	su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;
 842
 843	pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
 844			" %s\n", su_dev->t10_wwn.unit_serial);
 845
 846	return count;
 847}
 848
 849SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);
 850
 851/*
 852 * VPD page 0x83 Protocol Identifier
 853 */
 854static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
 855	struct t10_wwn *t10_wwn,
 856	char *page)
 857{
 858	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 859	struct se_device *dev;
 860	struct t10_vpd *vpd;
 861	unsigned char buf[VPD_TMP_BUF_SIZE];
 862	ssize_t len = 0;
 863
 864	dev = se_dev->se_dev_ptr;
 865	if (!dev)
 866		return -ENODEV;
 867
 868	memset(buf, 0, VPD_TMP_BUF_SIZE);
 869
 870	spin_lock(&t10_wwn->t10_vpd_lock);
 871	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
 872		if (!vpd->protocol_identifier_set)
 873			continue;
 874
 875		transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
 876
 877		if (len + strlen(buf) >= PAGE_SIZE)
 878			break;
 879
 880		len += sprintf(page+len, "%s", buf);
 881	}
 882	spin_unlock(&t10_wwn->t10_vpd_lock);
 883
 884	return len;
 885}
 886
 887static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
 888	struct t10_wwn *t10_wwn,
 889	const char *page,
 890	size_t count)
 891{
 892	return -ENOSYS;
 893}
 894
 895SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);
 896
 897/*
 898 * Generic wrapper for dumping VPD identifiers by association.
 899 */
 900#define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)				\
 901static ssize_t target_core_dev_wwn_show_attr_##_name(			\
 902	struct t10_wwn *t10_wwn,					\
 903	char *page)							\
 904{									\
 905	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;		\
 906	struct se_device *dev;						\
 907	struct t10_vpd *vpd;							\
 908	unsigned char buf[VPD_TMP_BUF_SIZE];				\
 909	ssize_t len = 0;						\
 910									\
 911	dev = se_dev->se_dev_ptr;					\
 912	if (!dev)							\
 913		return -ENODEV;						\
 914									\
 915	spin_lock(&t10_wwn->t10_vpd_lock);				\
 916	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {	\
 917		if (vpd->association != _assoc)				\
 918			continue;					\
 919									\
 920		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
 921		transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);	\
 922		if (len + strlen(buf) >= PAGE_SIZE)			\
 923			break;						\
 924		len += sprintf(page+len, "%s", buf);			\
 925									\
 926		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
 927		transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
 928		if (len + strlen(buf) >= PAGE_SIZE)			\
 929			break;						\
 930		len += sprintf(page+len, "%s", buf);			\
 931									\
 932		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
 933		transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
 934		if (len + strlen(buf) >= PAGE_SIZE)			\
 935			break;						\
 936		len += sprintf(page+len, "%s", buf);			\
 937	}								\
 938	spin_unlock(&t10_wwn->t10_vpd_lock);				\
 939									\
 940	return len;							\
 941}
 942
 943/*
 944 * VPD page 0x83 Association: Logical Unit
 945 */
 946DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
 947
 948static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
 949	struct t10_wwn *t10_wwn,
 950	const char *page,
 951	size_t count)
 952{
 953	return -ENOSYS;
 954}
 955
 956SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);
 957
 958/*
 959 * VPD page 0x83 Association: Target Port
 960 */
 961DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
 962
 963static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
 964	struct t10_wwn *t10_wwn,
 965	const char *page,
 966	size_t count)
 967{
 968	return -ENOSYS;
 969}
 970
 971SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);
 972
 973/*
 974 * VPD page 0x83 Association: SCSI Target Device
 975 */
 976DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
 977
 978static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
 979	struct t10_wwn *t10_wwn,
 980	const char *page,
 981	size_t count)
 982{
 983	return -ENOSYS;
 984}
 985
 986SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);
 987
 988CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);
 989
 990static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
 991	&target_core_dev_wwn_vpd_unit_serial.attr,
 992	&target_core_dev_wwn_vpd_protocol_identifier.attr,
 993	&target_core_dev_wwn_vpd_assoc_logical_unit.attr,
 994	&target_core_dev_wwn_vpd_assoc_target_port.attr,
 995	&target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
 996	NULL,
 997};
 998
 999static struct configfs_item_operations target_core_dev_wwn_ops = {
1000	.show_attribute		= target_core_dev_wwn_attr_show,
1001	.store_attribute	= target_core_dev_wwn_attr_store,
1002};
1003
1004static struct config_item_type target_core_dev_wwn_cit = {
1005	.ct_item_ops		= &target_core_dev_wwn_ops,
1006	.ct_attrs		= target_core_dev_wwn_attrs,
1007	.ct_owner		= THIS_MODULE,
1008};
1009
1010/*  End functions for struct config_item_type target_core_dev_wwn_cit */
1011
1012/*  Start functions for struct config_item_type target_core_dev_pr_cit */
1013
1014CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_subsystem_dev);
1015#define SE_DEV_PR_ATTR(_name, _mode)					\
1016static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1017	__CONFIGFS_EATTR(_name, _mode,					\
1018	target_core_dev_pr_show_attr_##_name,				\
1019	target_core_dev_pr_store_attr_##_name);
1020
1021#define SE_DEV_PR_ATTR_RO(_name);					\
1022static struct target_core_dev_pr_attribute target_core_dev_pr_##_name =	\
1023	__CONFIGFS_EATTR_RO(_name,					\
1024	target_core_dev_pr_show_attr_##_name);
1025
1026/*
1027 * res_holder
1028 */
1029static ssize_t target_core_dev_pr_show_spc3_res(
1030	struct se_device *dev,
1031	char *page,
1032	ssize_t *len)
1033{
1034	struct se_node_acl *se_nacl;
1035	struct t10_pr_registration *pr_reg;
1036	char i_buf[PR_REG_ISID_ID_LEN];
1037	int prf_isid;
1038
1039	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1040
1041	spin_lock(&dev->dev_reservation_lock);
1042	pr_reg = dev->dev_pr_res_holder;
1043	if (!pr_reg) {
1044		*len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
1045		spin_unlock(&dev->dev_reservation_lock);
1046		return *len;
1047	}
1048	se_nacl = pr_reg->pr_reg_nacl;
1049	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1050				PR_REG_ISID_ID_LEN);
1051
1052	*len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
1053		se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1054		se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
1055	spin_unlock(&dev->dev_reservation_lock);
1056
1057	return *len;
1058}
1059
1060static ssize_t target_core_dev_pr_show_spc2_res(
1061	struct se_device *dev,
1062	char *page,
1063	ssize_t *len)
1064{
1065	struct se_node_acl *se_nacl;
1066
1067	spin_lock(&dev->dev_reservation_lock);
1068	se_nacl = dev->dev_reserved_node_acl;
1069	if (!se_nacl) {
1070		*len += sprintf(page + *len, "No SPC-2 Reservation holder\n");
1071		spin_unlock(&dev->dev_reservation_lock);
1072		return *len;
1073	}
1074	*len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",
1075		se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1076		se_nacl->initiatorname);
1077	spin_unlock(&dev->dev_reservation_lock);
1078
1079	return *len;
1080}
1081
1082static ssize_t target_core_dev_pr_show_attr_res_holder(
1083	struct se_subsystem_dev *su_dev,
1084	char *page)
1085{
1086	ssize_t len = 0;
1087
1088	if (!su_dev->se_dev_ptr)
1089		return -ENODEV;
1090
1091	switch (su_dev->t10_pr.res_type) {
1092	case SPC3_PERSISTENT_RESERVATIONS:
1093		target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
1094				page, &len);
1095		break;
1096	case SPC2_RESERVATIONS:
1097		target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
1098				page, &len);
1099		break;
1100	case SPC_PASSTHROUGH:
1101		len += sprintf(page+len, "Passthrough\n");
1102		break;
1103	default:
1104		len += sprintf(page+len, "Unknown\n");
1105		break;
1106	}
1107
1108	return len;
1109}
1110
1111SE_DEV_PR_ATTR_RO(res_holder);
1112
1113/*
1114 * res_pr_all_tgt_pts
1115 */
1116static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
1117	struct se_subsystem_dev *su_dev,
1118	char *page)
1119{
1120	struct se_device *dev;
1121	struct t10_pr_registration *pr_reg;
1122	ssize_t len = 0;
1123
1124	dev = su_dev->se_dev_ptr;
1125	if (!dev)
1126		return -ENODEV;
1127
1128	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1129		return len;
1130
1131	spin_lock(&dev->dev_reservation_lock);
1132	pr_reg = dev->dev_pr_res_holder;
1133	if (!pr_reg) {
1134		len = sprintf(page, "No SPC-3 Reservation holder\n");
1135		spin_unlock(&dev->dev_reservation_lock);
1136		return len;
1137	}
1138	/*
1139	 * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
1140	 * Basic PERSISTENT RESERVER OUT parameter list, page 290
1141	 */
1142	if (pr_reg->pr_reg_all_tg_pt)
1143		len = sprintf(page, "SPC-3 Reservation: All Target"
1144			" Ports registration\n");
1145	else
1146		len = sprintf(page, "SPC-3 Reservation: Single"
1147			" Target Port registration\n");
1148	spin_unlock(&dev->dev_reservation_lock);
1149
1150	return len;
1151}
1152
1153SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);
1154
1155/*
1156 * res_pr_generation
1157 */
1158static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
1159	struct se_subsystem_dev *su_dev,
1160	char *page)
1161{
1162	if (!su_dev->se_dev_ptr)
1163		return -ENODEV;
1164
1165	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1166		return 0;
1167
1168	return sprintf(page, "0x%08x\n", su_dev->t10_pr.pr_generation);
1169}
1170
1171SE_DEV_PR_ATTR_RO(res_pr_generation);
1172
1173/*
1174 * res_pr_holder_tg_port
1175 */
1176static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
1177	struct se_subsystem_dev *su_dev,
1178	char *page)
1179{
1180	struct se_device *dev;
1181	struct se_node_acl *se_nacl;
1182	struct se_lun *lun;
1183	struct se_portal_group *se_tpg;
1184	struct t10_pr_registration *pr_reg;
1185	struct target_core_fabric_ops *tfo;
1186	ssize_t len = 0;
1187
1188	dev = su_dev->se_dev_ptr;
1189	if (!dev)
1190		return -ENODEV;
1191
1192	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1193		return len;
1194
1195	spin_lock(&dev->dev_reservation_lock);
1196	pr_reg = dev->dev_pr_res_holder;
1197	if (!pr_reg) {
1198		len = sprintf(page, "No SPC-3 Reservation holder\n");
1199		spin_unlock(&dev->dev_reservation_lock);
1200		return len;
1201	}
1202	se_nacl = pr_reg->pr_reg_nacl;
1203	se_tpg = se_nacl->se_tpg;
1204	lun = pr_reg->pr_reg_tg_pt_lun;
1205	tfo = se_tpg->se_tpg_tfo;
1206
1207	len += sprintf(page+len, "SPC-3 Reservation: %s"
1208		" Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1209		tfo->tpg_get_wwn(se_tpg));
1210	len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1211		" Identifer Tag: %hu %s Portal Group Tag: %hu"
1212		" %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
1213		tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1214		tfo->get_fabric_name(), lun->unpacked_lun);
1215	spin_unlock(&dev->dev_reservation_lock);
1216
1217	return len;
1218}
1219
1220SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);
1221
1222/*
1223 * res_pr_registered_i_pts
1224 */
1225static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
1226	struct se_subsystem_dev *su_dev,
1227	char *page)
1228{
1229	struct target_core_fabric_ops *tfo;
1230	struct t10_pr_registration *pr_reg;
1231	unsigned char buf[384];
1232	char i_buf[PR_REG_ISID_ID_LEN];
1233	ssize_t len = 0;
1234	int reg_count = 0, prf_isid;
1235
1236	if (!su_dev->se_dev_ptr)
1237		return -ENODEV;
1238
1239	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1240		return len;
1241
1242	len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1243
1244	spin_lock(&su_dev->t10_pr.registration_lock);
1245	list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1246			pr_reg_list) {
1247
1248		memset(buf, 0, 384);
1249		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1250		tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1251		prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1252					PR_REG_ISID_ID_LEN);
1253		sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1254			tfo->get_fabric_name(),
1255			pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
1256			&i_buf[0] : "", pr_reg->pr_res_key,
1257			pr_reg->pr_res_generation);
1258
1259		if (len + strlen(buf) >= PAGE_SIZE)
1260			break;
1261
1262		len += sprintf(page+len, "%s", buf);
1263		reg_count++;
1264	}
1265	spin_unlock(&su_dev->t10_pr.registration_lock);
1266
1267	if (!reg_count)
1268		len += sprintf(page+len, "None\n");
1269
1270	return len;
1271}
1272
1273SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);
1274
1275/*
1276 * res_pr_type
1277 */
1278static ssize_t target_core_dev_pr_show_attr_res_pr_type(
1279	struct se_subsystem_dev *su_dev,
1280	char *page)
1281{
1282	struct se_device *dev;
1283	struct t10_pr_registration *pr_reg;
1284	ssize_t len = 0;
1285
1286	dev = su_dev->se_dev_ptr;
1287	if (!dev)
1288		return -ENODEV;
1289
1290	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1291		return len;
1292
1293	spin_lock(&dev->dev_reservation_lock);
1294	pr_reg = dev->dev_pr_res_holder;
1295	if (!pr_reg) {
1296		len = sprintf(page, "No SPC-3 Reservation holder\n");
1297		spin_unlock(&dev->dev_reservation_lock);
1298		return len;
1299	}
1300	len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1301		core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1302	spin_unlock(&dev->dev_reservation_lock);
1303
1304	return len;
1305}
1306
1307SE_DEV_PR_ATTR_RO(res_pr_type);
1308
1309/*
1310 * res_type
1311 */
1312static ssize_t target_core_dev_pr_show_attr_res_type(
1313	struct se_subsystem_dev *su_dev,
1314	char *page)
1315{
1316	ssize_t len = 0;
1317
1318	if (!su_dev->se_dev_ptr)
1319		return -ENODEV;
1320
1321	switch (su_dev->t10_pr.res_type) {
1322	case SPC3_PERSISTENT_RESERVATIONS:
1323		len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1324		break;
1325	case SPC2_RESERVATIONS:
1326		len = sprintf(page, "SPC2_RESERVATIONS\n");
1327		break;
1328	case SPC_PASSTHROUGH:
1329		len = sprintf(page, "SPC_PASSTHROUGH\n");
1330		break;
1331	default:
1332		len = sprintf(page, "UNKNOWN\n");
1333		break;
1334	}
1335
1336	return len;
1337}
1338
1339SE_DEV_PR_ATTR_RO(res_type);
1340
1341/*
1342 * res_aptpl_active
1343 */
1344
1345static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
1346	struct se_subsystem_dev *su_dev,
1347	char *page)
1348{
1349	if (!su_dev->se_dev_ptr)
1350		return -ENODEV;
1351
1352	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1353		return 0;
1354
1355	return sprintf(page, "APTPL Bit Status: %s\n",
1356		(su_dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1357}
1358
1359SE_DEV_PR_ATTR_RO(res_aptpl_active);
1360
1361/*
1362 * res_aptpl_metadata
1363 */
1364static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
1365	struct se_subsystem_dev *su_dev,
1366	char *page)
1367{
1368	if (!su_dev->se_dev_ptr)
1369		return -ENODEV;
1370
1371	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1372		return 0;
1373
1374	return sprintf(page, "Ready to process PR APTPL metadata..\n");
1375}
1376
1377enum {
1378	Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1379	Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1380	Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1381	Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1382};
1383
1384static match_table_t tokens = {
1385	{Opt_initiator_fabric, "initiator_fabric=%s"},
1386	{Opt_initiator_node, "initiator_node=%s"},
1387	{Opt_initiator_sid, "initiator_sid=%s"},
1388	{Opt_sa_res_key, "sa_res_key=%s"},
1389	{Opt_res_holder, "res_holder=%d"},
1390	{Opt_res_type, "res_type=%d"},
1391	{Opt_res_scope, "res_scope=%d"},
1392	{Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1393	{Opt_mapped_lun, "mapped_lun=%d"},
1394	{Opt_target_fabric, "target_fabric=%s"},
1395	{Opt_target_node, "target_node=%s"},
1396	{Opt_tpgt, "tpgt=%d"},
1397	{Opt_port_rtpi, "port_rtpi=%d"},
1398	{Opt_target_lun, "target_lun=%d"},
1399	{Opt_err, NULL}
1400};
1401
1402static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
1403	struct se_subsystem_dev *su_dev,
1404	const char *page,
1405	size_t count)
1406{
1407	struct se_device *dev;
1408	unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1409	unsigned char *t_fabric = NULL, *t_port = NULL;
1410	char *orig, *ptr, *arg_p, *opts;
1411	substring_t args[MAX_OPT_ARGS];
1412	unsigned long long tmp_ll;
1413	u64 sa_res_key = 0;
1414	u32 mapped_lun = 0, target_lun = 0;
1415	int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1416	u16 port_rpti = 0, tpgt = 0;
1417	u8 type = 0, scope;
1418
1419	dev = su_dev->se_dev_ptr;
1420	if (!dev)
1421		return -ENODEV;
1422
1423	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1424		return 0;
1425
1426	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1427		pr_debug("Unable to process APTPL metadata while"
1428			" active fabric exports exist\n");
1429		return -EINVAL;
1430	}
1431
1432	opts = kstrdup(page, GFP_KERNEL);
1433	if (!opts)
1434		return -ENOMEM;
1435
1436	orig = opts;
1437	while ((ptr = strsep(&opts, ",\n")) != NULL) {
1438		if (!*ptr)
1439			continue;
1440
1441		token = match_token(ptr, tokens, args);
1442		switch (token) {
1443		case Opt_initiator_fabric:
1444			i_fabric = match_strdup(&args[0]);
1445			if (!i_fabric) {
1446				ret = -ENOMEM;
1447				goto out;
1448			}
1449			break;
1450		case Opt_initiator_node:
1451			i_port = match_strdup(&args[0]);
1452			if (!i_port) {
1453				ret = -ENOMEM;
1454				goto out;
1455			}
1456			if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1457				pr_err("APTPL metadata initiator_node="
1458					" exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1459					PR_APTPL_MAX_IPORT_LEN);
1460				ret = -EINVAL;
1461				break;
1462			}
1463			break;
1464		case Opt_initiator_sid:
1465			isid = match_strdup(&args[0]);
1466			if (!isid) {
1467				ret = -ENOMEM;
1468				goto out;
1469			}
1470			if (strlen(isid) >= PR_REG_ISID_LEN) {
1471				pr_err("APTPL metadata initiator_isid"
1472					"= exceeds PR_REG_ISID_LEN: %d\n",
1473					PR_REG_ISID_LEN);
1474				ret = -EINVAL;
1475				break;
1476			}
1477			break;
1478		case Opt_sa_res_key:
1479			arg_p = match_strdup(&args[0]);
1480			if (!arg_p) {
1481				ret = -ENOMEM;
1482				goto out;
1483			}
1484			ret = strict_strtoull(arg_p, 0, &tmp_ll);
1485			if (ret < 0) {
1486				pr_err("strict_strtoull() failed for"
1487					" sa_res_key=\n");
1488				goto out;
1489			}
1490			sa_res_key = (u64)tmp_ll;
1491			break;
1492		/*
1493		 * PR APTPL Metadata for Reservation
1494		 */
1495		case Opt_res_holder:
1496			match_int(args, &arg);
1497			res_holder = arg;
1498			break;
1499		case Opt_res_type:
1500			match_int(args, &arg);
1501			type = (u8)arg;
1502			break;
1503		case Opt_res_scope:
1504			match_int(args, &arg);
1505			scope = (u8)arg;
1506			break;
1507		case Opt_res_all_tg_pt:
1508			match_int(args, &arg);
1509			all_tg_pt = (int)arg;
1510			break;
1511		case Opt_mapped_lun:
1512			match_int(args, &arg);
1513			mapped_lun = (u32)arg;
1514			break;
1515		/*
1516		 * PR APTPL Metadata for Target Port
1517		 */
1518		case Opt_target_fabric:
1519			t_fabric = match_strdup(&args[0]);
1520			if (!t_fabric) {
1521				ret = -ENOMEM;
1522				goto out;
1523			}
1524			break;
1525		case Opt_target_node:
1526			t_port = match_strdup(&args[0]);
1527			if (!t_port) {
1528				ret = -ENOMEM;
1529				goto out;
1530			}
1531			if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1532				pr_err("APTPL metadata target_node="
1533					" exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1534					PR_APTPL_MAX_TPORT_LEN);
1535				ret = -EINVAL;
1536				break;
1537			}
1538			break;
1539		case Opt_tpgt:
1540			match_int(args, &arg);
1541			tpgt = (u16)arg;
1542			break;
1543		case Opt_port_rtpi:
1544			match_int(args, &arg);
1545			port_rpti = (u16)arg;
1546			break;
1547		case Opt_target_lun:
1548			match_int(args, &arg);
1549			target_lun = (u32)arg;
1550			break;
1551		default:
1552			break;
1553		}
1554	}
1555
1556	if (!i_port || !t_port || !sa_res_key) {
1557		pr_err("Illegal parameters for APTPL registration\n");
1558		ret = -EINVAL;
1559		goto out;
1560	}
1561
1562	if (res_holder && !(type)) {
1563		pr_err("Illegal PR type: 0x%02x for reservation"
1564				" holder\n", type);
1565		ret = -EINVAL;
1566		goto out;
1567	}
1568
1569	ret = core_scsi3_alloc_aptpl_registration(&su_dev->t10_pr, sa_res_key,
1570			i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1571			res_holder, all_tg_pt, type);
1572out:
1573	kfree(i_fabric);
1574	kfree(i_port);
1575	kfree(isid);
1576	kfree(t_fabric);
1577	kfree(t_port);
1578	kfree(orig);
1579	return (ret == 0) ? count : ret;
1580}
1581
1582SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);
1583
1584CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);
1585
1586static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1587	&target_core_dev_pr_res_holder.attr,
1588	&target_core_dev_pr_res_pr_all_tgt_pts.attr,
1589	&target_core_dev_pr_res_pr_generation.attr,
1590	&target_core_dev_pr_res_pr_holder_tg_port.attr,
1591	&target_core_dev_pr_res_pr_registered_i_pts.attr,
1592	&target_core_dev_pr_res_pr_type.attr,
1593	&target_core_dev_pr_res_type.attr,
1594	&target_core_dev_pr_res_aptpl_active.attr,
1595	&target_core_dev_pr_res_aptpl_metadata.attr,
1596	NULL,
1597};
1598
1599static struct configfs_item_operations target_core_dev_pr_ops = {
1600	.show_attribute		= target_core_dev_pr_attr_show,
1601	.store_attribute	= target_core_dev_pr_attr_store,
1602};
1603
1604static struct config_item_type target_core_dev_pr_cit = {
1605	.ct_item_ops		= &target_core_dev_pr_ops,
1606	.ct_attrs		= target_core_dev_pr_attrs,
1607	.ct_owner		= THIS_MODULE,
1608};
1609
1610/*  End functions for struct config_item_type target_core_dev_pr_cit */
1611
1612/*  Start functions for struct config_item_type target_core_dev_cit */
1613
1614static ssize_t target_core_show_dev_info(void *p, char *page)
1615{
1616	struct se_subsystem_dev *se_dev = p;
1617	struct se_hba *hba = se_dev->se_dev_hba;
1618	struct se_subsystem_api *t = hba->transport;
1619	int bl = 0;
1620	ssize_t read_bytes = 0;
1621
1622	if (!se_dev->se_dev_ptr)
1623		return -ENODEV;
1624
1625	transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
1626	read_bytes += bl;
1627	read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
1628	return read_bytes;
1629}
1630
1631static struct target_core_configfs_attribute target_core_attr_dev_info = {
1632	.attr	= { .ca_owner = THIS_MODULE,
1633		    .ca_name = "info",
1634		    .ca_mode = S_IRUGO },
1635	.show	= target_core_show_dev_info,
1636	.store	= NULL,
1637};
1638
1639static ssize_t target_core_store_dev_control(
1640	void *p,
1641	const char *page,
1642	size_t count)
1643{
1644	struct se_subsystem_dev *se_dev = p;
1645	struct se_hba *hba = se_dev->se_dev_hba;
1646	struct se_subsystem_api *t = hba->transport;
1647
1648	if (!se_dev->se_dev_su_ptr) {
1649		pr_err("Unable to locate struct se_subsystem_dev>se"
1650				"_dev_su_ptr\n");
1651		return -EINVAL;
1652	}
1653
1654	return t->set_configfs_dev_params(hba, se_dev, page, count);
1655}
1656
1657static struct target_core_configfs_attribute target_core_attr_dev_control = {
1658	.attr	= { .ca_owner = THIS_MODULE,
1659		    .ca_name = "control",
1660		    .ca_mode = S_IWUSR },
1661	.show	= NULL,
1662	.store	= target_core_store_dev_control,
1663};
1664
1665static ssize_t target_core_show_dev_alias(void *p, char *page)
1666{
1667	struct se_subsystem_dev *se_dev = p;
1668
1669	if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
1670		return 0;
1671
1672	return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_alias);
1673}
1674
1675static ssize_t target_core_store_dev_alias(
1676	void *p,
1677	const char *page,
1678	size_t count)
1679{
1680	struct se_subsystem_dev *se_dev = p;
1681	struct se_hba *hba = se_dev->se_dev_hba;
1682	ssize_t read_bytes;
1683
1684	if (count > (SE_DEV_ALIAS_LEN-1)) {
1685		pr_err("alias count: %d exceeds"
1686			" SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1687			SE_DEV_ALIAS_LEN-1);
1688		return -EINVAL;
1689	}
1690
1691	read_bytes = snprintf(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
1692			"%s", page);
1693	if (!read_bytes)
1694		return -EINVAL;
1695	if (se_dev->se_dev_alias[read_bytes - 1] == '\n')
1696		se_dev->se_dev_alias[read_bytes - 1] = '\0';
1697
1698	se_dev->su_dev_flags |= SDF_USING_ALIAS;
1699
1700	pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1701		config_item_name(&hba->hba_group.cg_item),
1702		config_item_name(&se_dev->se_dev_group.cg_item),
1703		se_dev->se_dev_alias);
1704
1705	return read_bytes;
1706}
1707
1708static struct target_core_configfs_attribute target_core_attr_dev_alias = {
1709	.attr	= { .ca_owner = THIS_MODULE,
1710		    .ca_name = "alias",
1711		    .ca_mode =  S_IRUGO | S_IWUSR },
1712	.show	= target_core_show_dev_alias,
1713	.store	= target_core_store_dev_alias,
1714};
1715
1716static ssize_t target_core_show_dev_udev_path(void *p, char *page)
1717{
1718	struct se_subsystem_dev *se_dev = p;
1719
1720	if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH))
1721		return 0;
1722
1723	return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_udev_path);
1724}
1725
1726static ssize_t target_core_store_dev_udev_path(
1727	void *p,
1728	const char *page,
1729	size_t count)
1730{
1731	struct se_subsystem_dev *se_dev = p;
1732	struct se_hba *hba = se_dev->se_dev_hba;
1733	ssize_t read_bytes;
1734
1735	if (count > (SE_UDEV_PATH_LEN-1)) {
1736		pr_err("udev_path count: %d exceeds"
1737			" SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1738			SE_UDEV_PATH_LEN-1);
1739		return -EINVAL;
1740	}
1741
1742	read_bytes = snprintf(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
1743			"%s", page);
1744	if (!read_bytes)
1745		return -EINVAL;
1746	if (se_dev->se_dev_udev_path[read_bytes - 1] == '\n')
1747		se_dev->se_dev_udev_path[read_bytes - 1] = '\0';
1748
1749	se_dev->su_dev_flags |= SDF_USING_UDEV_PATH;
1750
1751	pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1752		config_item_name(&hba->hba_group.cg_item),
1753		config_item_name(&se_dev->se_dev_group.cg_item),
1754		se_dev->se_dev_udev_path);
1755
1756	return read_bytes;
1757}
1758
1759static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
1760	.attr	= { .ca_owner = THIS_MODULE,
1761		    .ca_name = "udev_path",
1762		    .ca_mode =  S_IRUGO | S_IWUSR },
1763	.show	= target_core_show_dev_udev_path,
1764	.store	= target_core_store_dev_udev_path,
1765};
1766
1767static ssize_t target_core_store_dev_enable(
1768	void *p,
1769	const char *page,
1770	size_t count)
1771{
1772	struct se_subsystem_dev *se_dev = p;
1773	struct se_device *dev;
1774	struct se_hba *hba = se_dev->se_dev_hba;
1775	struct se_subsystem_api *t = hba->transport;
1776	char *ptr;
1777
1778	ptr = strstr(page, "1");
1779	if (!ptr) {
1780		pr_err("For dev_enable ops, only valid value"
1781				" is \"1\"\n");
1782		return -EINVAL;
1783	}
1784	if (se_dev->se_dev_ptr) {
1785		pr_err("se_dev->se_dev_ptr already set for storage"
1786				" object\n");
1787		return -EEXIST;
1788	}
1789
1790	if (t->check_configfs_dev_params(hba, se_dev) < 0)
1791		return -EINVAL;
1792
1793	dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1794	if (IS_ERR(dev))
1795		return PTR_ERR(dev);
1796	else if (!dev)
1797		return -EINVAL;
1798
1799	se_dev->se_dev_ptr = dev;
1800	pr_debug("Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
1801		" %p\n", se_dev->se_dev_ptr);
1802
1803	return count;
1804}
1805
1806static struct target_core_configfs_attribute target_core_attr_dev_enable = {
1807	.attr	= { .ca_owner = THIS_MODULE,
1808		    .ca_name = "enable",
1809		    .ca_mode = S_IWUSR },
1810	.show	= NULL,
1811	.store	= target_core_store_dev_enable,
1812};
1813
1814static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
1815{
1816	struct se_device *dev;
1817	struct se_subsystem_dev *su_dev = p;
1818	struct config_item *lu_ci;
1819	struct t10_alua_lu_gp *lu_gp;
1820	struct t10_alua_lu_gp_member *lu_gp_mem;
1821	ssize_t len = 0;
1822
1823	dev = su_dev->se_dev_ptr;
1824	if (!dev)
1825		return -ENODEV;
1826
1827	if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED)
1828		return len;
1829
1830	lu_gp_mem = dev->dev_alua_lu_gp_mem;
1831	if (!lu_gp_mem) {
1832		pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1833				" pointer\n");
1834		return -EINVAL;
1835	}
1836
1837	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1838	lu_gp = lu_gp_mem->lu_gp;
1839	if (lu_gp) {
1840		lu_ci = &lu_gp->lu_gp_group.cg_item;
1841		len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1842			config_item_name(lu_ci), lu_gp->lu_gp_id);
1843	}
1844	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1845
1846	return len;
1847}
1848
1849static ssize_t target_core_store_alua_lu_gp(
1850	void *p,
1851	const char *page,
1852	size_t count)
1853{
1854	struct se_device *dev;
1855	struct se_subsystem_dev *su_dev = p;
1856	struct se_hba *hba = su_dev->se_dev_hba;
1857	struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
1858	struct t10_alua_lu_gp_member *lu_gp_mem;
1859	unsigned char buf[LU_GROUP_NAME_BUF];
1860	int move = 0;
1861
1862	dev = su_dev->se_dev_ptr;
1863	if (!dev)
1864		return -ENODEV;
1865
1866	if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
1867		pr_warn("SPC3_ALUA_EMULATED not enabled for %s/%s\n",
1868			config_item_name(&hba->hba_group.cg_item),
1869			config_item_name(&su_dev->se_dev_group.cg_item));
1870		return -EINVAL;
1871	}
1872	if (count > LU_GROUP_NAME_BUF) {
1873		pr_err("ALUA LU Group Alias too large!\n");
1874		return -EINVAL;
1875	}
1876	memset(buf, 0, LU_GROUP_NAME_BUF);
1877	memcpy(buf, page, count);
1878	/*
1879	 * Any ALUA logical unit alias besides "NULL" means we will be
1880	 * making a new group association.
1881	 */
1882	if (strcmp(strstrip(buf), "NULL")) {
1883		/*
1884		 * core_alua_get_lu_gp_by_name() will increment reference to
1885		 * struct t10_alua_lu_gp.  This reference is released with
1886		 * core_alua_get_lu_gp_by_name below().
1887		 */
1888		lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
1889		if (!lu_gp_new)
1890			return -ENODEV;
1891	}
1892	lu_gp_mem = dev->dev_alua_lu_gp_mem;
1893	if (!lu_gp_mem) {
1894		if (lu_gp_new)
1895			core_alua_put_lu_gp_from_name(lu_gp_new);
1896		pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1897				" pointer\n");
1898		return -EINVAL;
1899	}
1900
1901	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1902	lu_gp = lu_gp_mem->lu_gp;
1903	if (lu_gp) {
1904		/*
1905		 * Clearing an existing lu_gp association, and replacing
1906		 * with NULL
1907		 */
1908		if (!lu_gp_new) {
1909			pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
1910				" from ALUA LU Group: core/alua/lu_gps/%s, ID:"
1911				" %hu\n",
1912				config_item_name(&hba->hba_group.cg_item),
1913				config_item_name(&su_dev->se_dev_group.cg_item),
1914				config_item_name(&lu_gp->lu_gp_group.cg_item),
1915				lu_gp->lu_gp_id);
1916
1917			__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1918			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1919
1920			return count;
1921		}
1922		/*
1923		 * Removing existing association of lu_gp_mem with lu_gp
1924		 */
1925		__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1926		move = 1;
1927	}
1928	/*
1929	 * Associate lu_gp_mem with lu_gp_new.
1930	 */
1931	__core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
1932	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1933
1934	pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
1935		" core/alua/lu_gps/%s, ID: %hu\n",
1936		(move) ? "Moving" : "Adding",
1937		config_item_name(&hba->hba_group.cg_item),
1938		config_item_name(&su_dev->se_dev_group.cg_item),
1939		config_item_name(&lu_gp_new->lu_gp_group.cg_item),
1940		lu_gp_new->lu_gp_id);
1941
1942	core_alua_put_lu_gp_from_name(lu_gp_new);
1943	return count;
1944}
1945
1946static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
1947	.attr	= { .ca_owner = THIS_MODULE,
1948		    .ca_name = "alua_lu_gp",
1949		    .ca_mode = S_IRUGO | S_IWUSR },
1950	.show	= target_core_show_alua_lu_gp,
1951	.store	= target_core_store_alua_lu_gp,
1952};
1953
1954static struct configfs_attribute *lio_core_dev_attrs[] = {
1955	&target_core_attr_dev_info.attr,
1956	&target_core_attr_dev_control.attr,
1957	&target_core_attr_dev_alias.attr,
1958	&target_core_attr_dev_udev_path.attr,
1959	&target_core_attr_dev_enable.attr,
1960	&target_core_attr_dev_alua_lu_gp.attr,
1961	NULL,
1962};
1963
1964static void target_core_dev_release(struct config_item *item)
1965{
1966	struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
1967				struct se_subsystem_dev, se_dev_group);
1968	struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
1969	struct se_subsystem_api *t = hba->transport;
1970	struct config_group *dev_cg = &se_dev->se_dev_group;
1971
1972	kfree(dev_cg->default_groups);
1973	/*
1974	 * This pointer will set when the storage is enabled with:
1975	 *`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
1976	 */
1977	if (se_dev->se_dev_ptr) {
1978		pr_debug("Target_Core_ConfigFS: Calling se_free_"
1979			"virtual_device() for se_dev_ptr: %p\n",
1980			se_dev->se_dev_ptr);
1981
1982		se_free_virtual_device(se_dev->se_dev_ptr, hba);
1983	} else {
1984		/*
1985		 * Release struct se_subsystem_dev->se_dev_su_ptr..
1986		 */
1987		pr_debug("Target_Core_ConfigFS: Calling t->free_"
1988			"device() for se_dev_su_ptr: %p\n",
1989			se_dev->se_dev_su_ptr);
1990
1991		t->free_device(se_dev->se_dev_su_ptr);
1992	}
1993
1994	pr_debug("Target_Core_ConfigFS: Deallocating se_subsystem"
1995			"_dev_t: %p\n", se_dev);
1996	kfree(se_dev);
1997}
1998
1999static ssize_t target_core_dev_show(struct config_item *item,
2000				     struct configfs_attribute *attr,
2001				     char *page)
2002{
2003	struct se_subsystem_dev *se_dev = container_of(
2004			to_config_group(item), struct se_subsystem_dev,
2005			se_dev_group);
2006	struct target_core_configfs_attribute *tc_attr = container_of(
2007			attr, struct target_core_configfs_attribute, attr);
2008
2009	if (!tc_attr->show)
2010		return -EINVAL;
2011
2012	return tc_attr->show(se_dev, page);
2013}
2014
2015static ssize_t target_core_dev_store(struct config_item *item,
2016				      struct configfs_attribute *attr,
2017				      const char *page, size_t count)
2018{
2019	struct se_subsystem_dev *se_dev = container_of(
2020			to_config_group(item), struct se_subsystem_dev,
2021			se_dev_group);
2022	struct target_core_configfs_attribute *tc_attr = container_of(
2023			attr, struct target_core_configfs_attribute, attr);
2024
2025	if (!tc_attr->store)
2026		return -EINVAL;
2027
2028	return tc_attr->store(se_dev, page, count);
2029}
2030
2031static struct configfs_item_operations target_core_dev_item_ops = {
2032	.release		= target_core_dev_release,
2033	.show_attribute		= target_core_dev_show,
2034	.store_attribute	= target_core_dev_store,
2035};
2036
2037static struct config_item_type target_core_dev_cit = {
2038	.ct_item_ops		= &target_core_dev_item_ops,
2039	.ct_attrs		= lio_core_dev_attrs,
2040	.ct_owner		= THIS_MODULE,
2041};
2042
2043/* End functions for struct config_item_type target_core_dev_cit */
2044
2045/* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2046
2047CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
2048#define SE_DEV_ALUA_LU_ATTR(_name, _mode)				\
2049static struct target_core_alua_lu_gp_attribute				\
2050			target_core_alua_lu_gp_##_name =		\
2051	__CONFIGFS_EATTR(_name, _mode,					\
2052	target_core_alua_lu_gp_show_attr_##_name,			\
2053	target_core_alua_lu_gp_store_attr_##_name);
2054
2055#define SE_DEV_ALUA_LU_ATTR_RO(_name)					\
2056static struct target_core_alua_lu_gp_attribute				\
2057			target_core_alua_lu_gp_##_name =		\
2058	__CONFIGFS_EATTR_RO(_name,					\
2059	target_core_alua_lu_gp_show_attr_##_name);
2060
2061/*
2062 * lu_gp_id
2063 */
2064static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
2065	struct t10_alua_lu_gp *lu_gp,
2066	char *page)
2067{
2068	if (!lu_gp->lu_gp_valid_id)
2069		return 0;
2070
2071	return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2072}
2073
2074static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
2075	struct t10_alua_lu_gp *lu_gp,
2076	const char *page,
2077	size_t count)
2078{
2079	struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2080	unsigned long lu_gp_id;
2081	int ret;
2082
2083	ret = strict_strtoul(page, 0, &lu_gp_id);
2084	if (ret < 0) {
2085		pr_err("strict_strtoul() returned %d for"
2086			" lu_gp_id\n", ret);
2087		return -EINVAL;
2088	}
2089	if (lu_gp_id > 0x0000ffff) {
2090		pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2091			" 0x0000ffff\n", lu_gp_id);
2092		return -EINVAL;
2093	}
2094
2095	ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2096	if (ret < 0)
2097		return -EINVAL;
2098
2099	pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2100		" Group: core/alua/lu_gps/%s to ID: %hu\n",
2101		config_item_name(&alua_lu_gp_cg->cg_item),
2102		lu_gp->lu_gp_id);
2103
2104	return count;
2105}
2106
2107SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);
2108
2109/*
2110 * members
2111 */
2112static ssize_t target_core_alua_lu_gp_show_attr_members(
2113	struct t10_alua_lu_gp *lu_gp,
2114	char *page)
2115{
2116	struct se_device *dev;
2117	struct se_hba *hba;
2118	struct se_subsystem_dev *su_dev;
2119	struct t10_alua_lu_gp_member *lu_gp_mem;
2120	ssize_t len = 0, cur_len;
2121	unsigned char buf[LU_GROUP_NAME_BUF];
2122
2123	memset(buf, 0, LU_GROUP_NAME_BUF);
2124
2125	spin_lock(&lu_gp->lu_gp_lock);
2126	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2127		dev = lu_gp_mem->lu_gp_mem_dev;
2128		su_dev = dev->se_sub_dev;
2129		hba = su_dev->se_dev_hba;
2130
2131		cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2132			config_item_name(&hba->hba_group.cg_item),
2133			config_item_name(&su_dev->se_dev_group.cg_item));
2134		cur_len++; /* Extra byte for NULL terminator */
2135
2136		if ((cur_len + len) > PAGE_SIZE) {
2137			pr_warn("Ran out of lu_gp_show_attr"
2138				"_members buffer\n");
2139			break;
2140		}
2141		memcpy(page+len, buf, cur_len);
2142		len += cur_len;
2143	}
2144	spin_unlock(&lu_gp->lu_gp_lock);
2145
2146	return len;
2147}
2148
2149SE_DEV_ALUA_LU_ATTR_RO(members);
2150
2151CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);
2152
2153static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2154	&target_core_alua_lu_gp_lu_gp_id.attr,
2155	&target_core_alua_lu_gp_members.attr,
2156	NULL,
2157};
2158
2159static void target_core_alua_lu_gp_release(struct config_item *item)
2160{
2161	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2162			struct t10_alua_lu_gp, lu_gp_group);
2163
2164	core_alua_free_lu_gp(lu_gp);
2165}
2166
2167static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2168	.release		= target_core_alua_lu_gp_release,
2169	.show_attribute		= target_core_alua_lu_gp_attr_show,
2170	.store_attribute	= target_core_alua_lu_gp_attr_store,
2171};
2172
2173static struct config_item_type target_core_alua_lu_gp_cit = {
2174	.ct_item_ops		= &target_core_alua_lu_gp_ops,
2175	.ct_attrs		= target_core_alua_lu_gp_attrs,
2176	.ct_owner		= THIS_MODULE,
2177};
2178
2179/* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2180
2181/* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2182
2183static struct config_group *target_core_alua_create_lu_gp(
2184	struct config_group *group,
2185	const char *name)
2186{
2187	struct t10_alua_lu_gp *lu_gp;
2188	struct config_group *alua_lu_gp_cg = NULL;
2189	struct config_item *alua_lu_gp_ci = NULL;
2190
2191	lu_gp = core_alua_allocate_lu_gp(name, 0);
2192	if (IS_ERR(lu_gp))
2193		return NULL;
2194
2195	alua_lu_gp_cg = &lu_gp->lu_gp_group;
2196	alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2197
2198	config_group_init_type_name(alua_lu_gp_cg, name,
2199			&target_core_alua_lu_gp_cit);
2200
2201	pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2202		" Group: core/alua/lu_gps/%s\n",
2203		config_item_name(alua_lu_gp_ci));
2204
2205	return alua_lu_gp_cg;
2206
2207}
2208
2209static void target_core_alua_drop_lu_gp(
2210	struct config_group *group,
2211	struct config_item *item)
2212{
2213	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2214			struct t10_alua_lu_gp, lu_gp_group);
2215
2216	pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2217		" Group: core/alua/lu_gps/%s, ID: %hu\n",
2218		config_item_name(item), lu_gp->lu_gp_id);
2219	/*
2220	 * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2221	 * -> target_core_alua_lu_gp_release()
2222	 */
2223	config_item_put(item);
2224}
2225
2226static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2227	.make_group		= &target_core_alua_create_lu_gp,
2228	.drop_item		= &target_core_alua_drop_lu_gp,
2229};
2230
2231static struct config_item_type target_core_alua_lu_gps_cit = {
2232	.ct_item_ops		= NULL,
2233	.ct_group_ops		= &target_core_alua_lu_gps_group_ops,
2234	.ct_owner		= THIS_MODULE,
2235};
2236
2237/* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2238
2239/* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2240
2241CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
2242#define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)				\
2243static struct target_core_alua_tg_pt_gp_attribute			\
2244			target_core_alua_tg_pt_gp_##_name =		\
2245	__CONFIGFS_EATTR(_name, _mode,					\
2246	target_core_alua_tg_pt_gp_show_attr_##_name,			\
2247	target_core_alua_tg_pt_gp_store_attr_##_name);
2248
2249#define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)				\
2250static struct target_core_alua_tg_pt_gp_attribute			\
2251			target_core_alua_tg_pt_gp_##_name =		\
2252	__CONFIGFS_EATTR_RO(_name,					\
2253	target_core_alua_tg_pt_gp_show_attr_##_name);
2254
2255/*
2256 * alua_access_state
2257 */
2258static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
2259	struct t10_alua_tg_pt_gp *tg_pt_gp,
2260	char *page)
2261{
2262	return sprintf(page, "%d\n",
2263		atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
2264}
2265
2266static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
2267	struct t10_alua_tg_pt_gp *tg_pt_gp,
2268	const char *page,
2269	size_t count)
2270{
2271	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
2272	unsigned long tmp;
2273	int new_state, ret;
2274
2275	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2276		pr_err("Unable to do implict ALUA on non valid"
2277			" tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2278		return -EINVAL;
2279	}
2280
2281	ret = strict_strtoul(page, 0, &tmp);
2282	if (ret < 0) {
2283		pr_err("Unable to extract new ALUA access state from"
2284				" %s\n", page);
2285		return -EINVAL;
2286	}
2287	new_state = (int)tmp;
2288
2289	if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) {
2290		pr_err("Unable to process implict configfs ALUA"
2291			" transition while TPGS_IMPLICT_ALUA is disabled\n");
2292		return -EINVAL;
2293	}
2294
2295	ret = core_alua_do_port_transition(tg_pt_gp, su_dev->se_dev_ptr,
2296					NULL, NULL, new_state, 0);
2297	return (!ret) ? count : -EINVAL;
2298}
2299
2300SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);
2301
2302/*
2303 * alua_access_status
2304 */
2305static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
2306	struct t10_alua_tg_pt_gp *tg_pt_gp,
2307	char *page)
2308{
2309	return sprintf(page, "%s\n",
2310		core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2311}
2312
2313static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
2314	struct t10_alua_tg_pt_gp *tg_pt_gp,
2315	const char *page,
2316	size_t count)
2317{
2318	unsigned long tmp;
2319	int new_status, ret;
2320
2321	if (!tg_pt_gp->tg_pt_gp_valid_id) {
2322		pr_err("Unable to do set ALUA access status on non"
2323			" valid tg_pt_gp ID: %hu\n",
2324			tg_pt_gp->tg_pt_gp_valid_id);
2325		return -EINVAL;
2326	}
2327
2328	ret = strict_strtoul(page, 0, &tmp);
2329	if (ret < 0) {
2330		pr_err("Unable to extract new ALUA access status"
2331				" from %s\n", page);
2332		return -EINVAL;
2333	}
2334	new_status = (int)tmp;
2335
2336	if ((new_status != ALUA_STATUS_NONE) &&
2337	    (new_status != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
2338	    (new_status != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
2339		pr_err("Illegal ALUA access status: 0x%02x\n",
2340				new_status);
2341		return -EINVAL;
2342	}
2343
2344	tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2345	return count;
2346}
2347
2348SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);
2349
2350/*
2351 * alua_access_type
2352 */
2353static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
2354	struct t10_alua_tg_pt_gp *tg_pt_gp,
2355	char *page)
2356{
2357	return core_alua_show_access_type(tg_pt_gp, page);
2358}
2359
2360static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
2361	struct t10_alua_tg_pt_gp *tg_pt_gp,
2362	const char *page,
2363	size_t count)
2364{
2365	return core_alua_store_access_type(tg_pt_gp, page, count);
2366}
2367
2368SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);
2369
2370/*
2371 * alua_write_metadata
2372 */
2373static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
2374	struct t10_alua_tg_pt_gp *tg_pt_gp,
2375	char *page)
2376{
2377	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
2378}
2379
2380static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
2381	struct t10_alua_tg_pt_gp *tg_pt_gp,
2382	const char *page,
2383	size_t count)
2384{
2385	unsigned long tmp;
2386	int ret;
2387
2388	ret = strict_strtoul(page, 0, &tmp);
2389	if (ret < 0) {
2390		pr_err("Unable to extract alua_write_metadata\n");
2391		return -EINVAL;
2392	}
2393
2394	if ((tmp != 0) && (tmp != 1)) {
2395		pr_err("Illegal value for alua_write_metadata:"
2396			" %lu\n", tmp);
2397		return -EINVAL;
2398	}
2399	tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2400
2401	return count;
2402}
2403
2404SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);
2405
2406
2407
2408/*
2409 * nonop_delay_msecs
2410 */
2411static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
2412	struct t10_alua_tg_pt_gp *tg_pt_gp,
2413	char *page)
2414{
2415	return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);
2416
2417}
2418
2419static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
2420	struct t10_alua_tg_pt_gp *tg_pt_gp,
2421	const char *page,
2422	size_t count)
2423{
2424	return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
2425}
2426
2427SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);
2428
2429/*
2430 * trans_delay_msecs
2431 */
2432static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
2433	struct t10_alua_tg_pt_gp *tg_pt_gp,
2434	char *page)
2435{
2436	return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
2437}
2438
2439static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
2440	struct t10_alua_tg_pt_gp *tg_pt_gp,
2441	const char *page,
2442	size_t count)
2443{
2444	return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
2445}
2446
2447SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);
2448
2449/*
2450 * implict_trans_secs
2451 */
2452static ssize_t target_core_alua_tg_pt_gp_show_attr_implict_trans_secs(
2453	struct t10_alua_tg_pt_gp *tg_pt_gp,
2454	char *page)
2455{
2456	return core_alua_show_implict_trans_secs(tg_pt_gp, page);
2457}
2458
2459static ssize_t target_core_alua_tg_pt_gp_store_attr_implict_trans_secs(
2460	struct t10_alua_tg_pt_gp *tg_pt_gp,
2461	const char *page,
2462	size_t count)
2463{
2464	return core_alua_store_implict_trans_secs(tg_pt_gp, page, count);
2465}
2466
2467SE_DEV_ALUA_TG_PT_ATTR(implict_trans_secs, S_IRUGO | S_IWUSR);
2468
2469/*
2470 * preferred
2471 */
2472
2473static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
2474	struct t10_alua_tg_pt_gp *tg_pt_gp,
2475	char *page)
2476{
2477	return core_alua_show_preferred_bit(tg_pt_gp, page);
2478}
2479
2480static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
2481	struct t10_alua_tg_pt_gp *tg_pt_gp,
2482	const char *page,
2483	size_t count)
2484{
2485	return core_alua_store_preferred_bit(tg_pt_gp, page, count);
2486}
2487
2488SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);
2489
2490/*
2491 * tg_pt_gp_id
2492 */
2493static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
2494	struct t10_alua_tg_pt_gp *tg_pt_gp,
2495	char *page)
2496{
2497	if (!tg_pt_gp->tg_pt_gp_valid_id)
2498		return 0;
2499
2500	return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2501}
2502
2503static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
2504	struct t10_alua_tg_pt_gp *tg_pt_gp,
2505	const char *page,
2506	size_t count)
2507{
2508	struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2509	unsigned long tg_pt_gp_id;
2510	int ret;
2511
2512	ret = strict_strtoul(page, 0, &tg_pt_gp_id);
2513	if (ret < 0) {
2514		pr_err("strict_strtoul() returned %d for"
2515			" tg_pt_gp_id\n", ret);
2516		return -EINVAL;
2517	}
2518	if (tg_pt_gp_id > 0x0000ffff) {
2519		pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
2520			" 0x0000ffff\n", tg_pt_gp_id);
2521		return -EINVAL;
2522	}
2523
2524	ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2525	if (ret < 0)
2526		return -EINVAL;
2527
2528	pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2529		"core/alua/tg_pt_gps/%s to ID: %hu\n",
2530		config_item_name(&alua_tg_pt_gp_cg->cg_item),
2531		tg_pt_gp->tg_pt_gp_id);
2532
2533	return count;
2534}
2535
2536SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);
2537
2538/*
2539 * members
2540 */
2541static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
2542	struct t10_alua_tg_pt_gp *tg_pt_gp,
2543	char *page)
2544{
2545	struct se_port *port;
2546	struct se_portal_group *tpg;
2547	struct se_lun *lun;
2548	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2549	ssize_t len = 0, cur_len;
2550	unsigned char buf[TG_PT_GROUP_NAME_BUF];
2551
2552	memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2553
2554	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2555	list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
2556			tg_pt_gp_mem_list) {
2557		port = tg_pt_gp_mem->tg_pt;
2558		tpg = port->sep_tpg;
2559		lun = port->sep_lun;
2560
2561		cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2562			"/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2563			tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2564			tpg->se_tpg_tfo->tpg_get_tag(tpg),
2565			config_item_name(&lun->lun_group.cg_item));
2566		cur_len++; /* Extra byte for NULL terminator */
2567
2568		if ((cur_len + len) > PAGE_SIZE) {
2569			pr_warn("Ran out of lu_gp_show_attr"
2570				"_members buffer\n");
2571			break;
2572		}
2573		memcpy(page+len, buf, cur_len);
2574		len += cur_len;
2575	}
2576	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2577
2578	return len;
2579}
2580
2581SE_DEV_ALUA_TG_PT_ATTR_RO(members);
2582
2583CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
2584			tg_pt_gp_group);
2585
2586static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2587	&target_core_alua_tg_pt_gp_alua_access_state.attr,
2588	&target_core_alua_tg_pt_gp_alua_access_status.attr,
2589	&target_core_alua_tg_pt_gp_alua_access_type.attr,
2590	&target_core_alua_tg_pt_gp_alua_write_metadata.attr,
2591	&target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
2592	&target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
2593	&target_core_alua_tg_pt_gp_implict_trans_secs.attr,
2594	&target_core_alua_tg_pt_gp_preferred.attr,
2595	&target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
2596	&target_core_alua_tg_pt_gp_members.attr,
2597	NULL,
2598};
2599
2600static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2601{
2602	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2603			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2604
2605	core_alua_free_tg_pt_gp(tg_pt_gp);
2606}
2607
2608static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2609	.release		= target_core_alua_tg_pt_gp_release,
2610	.show_attribute		= target_core_alua_tg_pt_gp_attr_show,
2611	.store_attribute	= target_core_alua_tg_pt_gp_attr_store,
2612};
2613
2614static struct config_item_type target_core_alua_tg_pt_gp_cit = {
2615	.ct_item_ops		= &target_core_alua_tg_pt_gp_ops,
2616	.ct_attrs		= target_core_alua_tg_pt_gp_attrs,
2617	.ct_owner		= THIS_MODULE,
2618};
2619
2620/* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2621
2622/* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2623
2624static struct config_group *target_core_alua_create_tg_pt_gp(
2625	struct config_group *group,
2626	const char *name)
2627{
2628	struct t10_alua *alua = container_of(group, struct t10_alua,
2629					alua_tg_pt_gps_group);
2630	struct t10_alua_tg_pt_gp *tg_pt_gp;
2631	struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
2632	struct config_group *alua_tg_pt_gp_cg = NULL;
2633	struct config_item *alua_tg_pt_gp_ci = NULL;
2634
2635	tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
2636	if (!tg_pt_gp)
2637		return NULL;
2638
2639	alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2640	alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2641
2642	config_group_init_type_name(alua_tg_pt_gp_cg, name,
2643			&target_core_alua_tg_pt_gp_cit);
2644
2645	pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2646		" Group: alua/tg_pt_gps/%s\n",
2647		config_item_name(alua_tg_pt_gp_ci));
2648
2649	return alua_tg_pt_gp_cg;
2650}
2651
2652static void target_core_alua_drop_tg_pt_gp(
2653	struct config_group *group,
2654	struct config_item *item)
2655{
2656	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2657			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2658
2659	pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2660		" Group: alua/tg_pt_gps/%s, ID: %hu\n",
2661		config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2662	/*
2663	 * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2664	 * -> target_core_alua_tg_pt_gp_release().
2665	 */
2666	config_item_put(item);
2667}
2668
2669static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2670	.make_group		= &target_core_alua_create_tg_pt_gp,
2671	.drop_item		= &target_core_alua_drop_tg_pt_gp,
2672};
2673
2674static struct config_item_type target_core_alua_tg_pt_gps_cit = {
2675	.ct_group_ops		= &target_core_alua_tg_pt_gps_group_ops,
2676	.ct_owner		= THIS_MODULE,
2677};
2678
2679/* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2680
2681/* Start functions for struct config_item_type target_core_alua_cit */
2682
2683/*
2684 * target_core_alua_cit is a ConfigFS group that lives under
2685 * /sys/kernel/config/target/core/alua.  There are default groups
2686 * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2687 * target_core_alua_cit in target_core_init_configfs() below.
2688 */
2689static struct config_item_type target_core_alua_cit = {
2690	.ct_item_ops		= NULL,
2691	.ct_attrs		= NULL,
2692	.ct_owner		= THIS_MODULE,
2693};
2694
2695/* End functions for struct config_item_type target_core_alua_cit */
2696
2697/* Start functions for struct config_item_type target_core_stat_cit */
2698
2699static struct config_group *target_core_stat_mkdir(
2700	struct config_group *group,
2701	const char *name)
2702{
2703	return ERR_PTR(-ENOSYS);
2704}
2705
2706static void target_core_stat_rmdir(
2707	struct config_group *group,
2708	struct config_item *item)
2709{
2710	return;
2711}
2712
2713static struct configfs_group_operations target_core_stat_group_ops = {
2714	.make_group		= &target_core_stat_mkdir,
2715	.drop_item		= &target_core_stat_rmdir,
2716};
2717
2718static struct config_item_type target_core_stat_cit = {
2719	.ct_group_ops		= &target_core_stat_group_ops,
2720	.ct_owner		= THIS_MODULE,
2721};
2722
2723/* End functions for struct config_item_type target_core_stat_cit */
2724
2725/* Start functions for struct config_item_type target_core_hba_cit */
2726
2727static struct config_group *target_core_make_subdev(
2728	struct config_group *group,
2729	const char *name)
2730{
2731	struct t10_alua_tg_pt_gp *tg_pt_gp;
2732	struct se_subsystem_dev *se_dev;
2733	struct se_subsystem_api *t;
2734	struct config_item *hba_ci = &group->cg_item;
2735	struct se_hba *hba = item_to_hba(hba_ci);
2736	struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
2737	struct config_group *dev_stat_grp = NULL;
2738	int errno = -ENOMEM, ret;
2739
2740	ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2741	if (ret)
2742		return ERR_PTR(ret);
2743	/*
2744	 * Locate the struct se_subsystem_api from parent's struct se_hba.
2745	 */
2746	t = hba->transport;
2747
2748	se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
2749	if (!se_dev) {
2750		pr_err("Unable to allocate memory for"
2751				" struct se_subsystem_dev\n");
2752		goto unlock;
2753	}
2754	INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
2755	spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
2756	INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
2757	INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
2758	spin_lock_init(&se_dev->t10_pr.registration_lock);
2759	spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
2760	INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
2761	spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
2762	spin_lock_init(&se_dev->se_dev_lock);
2763	se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
2764	se_dev->t10_wwn.t10_sub_dev = se_dev;
2765	se_dev->t10_alua.t10_sub_dev = se_dev;
2766	se_dev->se_dev_attrib.da_sub_dev = se_dev;
2767
2768	se_dev->se_dev_hba = hba;
2769	dev_cg = &se_dev->se_dev_group;
2770
2771	dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 7,
2772			GFP_KERNEL);
2773	if (!dev_cg->default_groups)
2774		goto out;
2775	/*
2776	 * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
2777	 * for ->allocate_virtdevice()
2778	 *
2779	 * se_dev->se_dev_ptr will be set after ->create_virtdev()
2780	 * has been called successfully in the next level up in the
2781	 * configfs tree for device object's struct config_group.
2782	 */
2783	se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
2784	if (!se_dev->se_dev_su_ptr) {
2785		pr_err("Unable to locate subsystem dependent pointer"
2786			" from allocate_virtdevice()\n");
2787		goto out;
2788	}
2789
2790	config_group_init_type_name(&se_dev->se_dev_group, name,
2791			&target_core_dev_cit);
2792	config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
2793			&target_core_dev_attrib_cit);
2794	config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
2795			&target_core_dev_pr_cit);
2796	config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
2797			&target_core_dev_wwn_cit);
2798	config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
2799			"alua", &target_core_alua_tg_pt_gps_cit);
2800	config_group_init_type_name(&se_dev->dev_stat_grps.stat_group,
2801			"statistics", &target_core_stat_cit);
2802
2803	dev_cg->default_groups[0] = &se_dev->se_dev_attrib.da_group;
2804	dev_cg->default_groups[1] = &se_dev->se_dev_pr_group;
2805	dev_cg->default_groups[2] = &se_dev->t10_wwn.t10_wwn_group;
2806	dev_cg->default_groups[3] = &se_dev->t10_alua.alua_tg_pt_gps_group;
2807	dev_cg->default_groups[4] = &se_dev->dev_stat_grps.stat_group;
2808	dev_cg->default_groups[5] = NULL;
2809	/*
2810	 * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2811	 */
2812	tg_pt_gp = core_alua_allocate_tg_pt_gp(se_dev, "default_tg_pt_gp", 1);
2813	if (!tg_pt_gp)
2814		goto out;
2815
2816	tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2817	tg_pt_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
2818				GFP_KERNEL);
2819	if (!tg_pt_gp_cg->default_groups) {
2820		pr_err("Unable to allocate tg_pt_gp_cg->"
2821				"default_groups\n");
2822		goto out;
2823	}
2824
2825	config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2826			"default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2827	tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
2828	tg_pt_gp_cg->default_groups[1] = NULL;
2829	se_dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2830	/*
2831	 * Add core/$HBA/$DEV/statistics/ default groups
2832	 */
2833	dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2834	dev_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 4,
2835				GFP_KERNEL);
2836	if (!dev_stat_grp->default_groups) {
2837		pr_err("Unable to allocate dev_stat_grp->default_groups\n");
2838		goto out;
2839	}
2840	target_stat_setup_dev_default_groups(se_dev);
2841
2842	pr_debug("Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
2843		" %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);
2844
2845	mutex_unlock(&hba->hba_access_mutex);
2846	return &se_dev->se_dev_group;
2847out:
2848	if (se_dev->t10_alua.default_tg_pt_gp) {
2849		core_alua_free_tg_pt_gp(se_dev->t10_alua.default_tg_pt_gp);
2850		se_dev->t10_alua.default_tg_pt_gp = NULL;
2851	}
2852	if (dev_stat_grp)
2853		kfree(dev_stat_grp->default_groups);
2854	if (tg_pt_gp_cg)
2855		kfree(tg_pt_gp_cg->default_groups);
2856	if (dev_cg)
2857		kfree(dev_cg->default_groups);
2858	if (se_dev->se_dev_su_ptr)
2859		t->free_device(se_dev->se_dev_su_ptr);
2860	kfree(se_dev);
2861unlock:
2862	mutex_unlock(&hba->hba_access_mutex);
2863	return ERR_PTR(errno);
2864}
2865
2866static void target_core_drop_subdev(
2867	struct config_group *group,
2868	struct config_item *item)
2869{
2870	struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
2871				struct se_subsystem_dev, se_dev_group);
2872	struct se_hba *hba;
2873	struct config_item *df_item;
2874	struct config_group *dev_cg, *tg_pt_gp_cg, *dev_stat_grp;
2875	int i;
2876
2877	hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
2878
2879	mutex_lock(&hba->hba_access_mutex);
2880
2881	dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2882	for (i = 0; dev_stat_grp->default_groups[i]; i++) {
2883		df_item = &dev_stat_grp->default_groups[i]->cg_item;
2884		dev_stat_grp->default_groups[i] = NULL;
2885		config_item_put(df_item);
2886	}
2887	kfree(dev_stat_grp->default_groups);
2888
2889	tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2890	for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
2891		df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
2892		tg_pt_gp_cg->default_groups[i] = NULL;
2893		config_item_put(df_item);
2894	}
2895	kfree(tg_pt_gp_cg->default_groups);
2896	/*
2897	 * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
2898	 * directly from target_core_alua_tg_pt_gp_release().
2899	 */
2900	se_dev->t10_alua.default_tg_pt_gp = NULL;
2901
2902	dev_cg = &se_dev->se_dev_group;
2903	for (i = 0; dev_cg->default_groups[i]; i++) {
2904		df_item = &dev_cg->default_groups[i]->cg_item;
2905		dev_cg->default_groups[i] = NULL;
2906		config_item_put(df_item);
2907	}
2908	/*
2909	 * The releasing of se_dev and associated se_dev->se_dev_ptr is done
2910	 * from target_core_dev_item_ops->release() ->target_core_dev_release().
2911	 */
2912	config_item_put(item);
2913	mutex_unlock(&hba->hba_access_mutex);
2914}
2915
2916static struct configfs_group_operations target_core_hba_group_ops = {
2917	.make_group		= target_core_make_subdev,
2918	.drop_item		= target_core_drop_subdev,
2919};
2920
2921CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
2922#define SE_HBA_ATTR(_name, _mode)				\
2923static struct target_core_hba_attribute				\
2924		target_core_hba_##_name =			\
2925		__CONFIGFS_EATTR(_name, _mode,			\
2926		target_core_hba_show_attr_##_name,		\
2927		target_core_hba_store_attr_##_name);
2928
2929#define SE_HBA_ATTR_RO(_name)					\
2930static struct target_core_hba_attribute				\
2931		target_core_hba_##_name =			\
2932		__CONFIGFS_EATTR_RO(_name,			\
2933		target_core_hba_show_attr_##_name);
2934
2935static ssize_t target_core_hba_show_attr_hba_info(
2936	struct se_hba *hba,
2937	char *page)
2938{
2939	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
2940			hba->hba_id, hba->transport->name,
2941			TARGET_CORE_CONFIGFS_VERSION);
2942}
2943
2944SE_HBA_ATTR_RO(hba_info);
2945
2946static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
2947				char *page)
2948{
2949	int hba_mode = 0;
2950
2951	if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
2952		hba_mode = 1;
2953
2954	return sprintf(page, "%d\n", hba_mode);
2955}
2956
2957static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
2958				const char *page, size_t count)
2959{
2960	struct se_subsystem_api *transport = hba->transport;
2961	unsigned long mode_flag;
2962	int ret;
2963
2964	if (transport->pmode_enable_hba == NULL)
2965		return -EINVAL;
2966
2967	ret = strict_strtoul(page, 0, &mode_flag);
2968	if (ret < 0) {
2969		pr_err("Unable to extract hba mode flag: %d\n", ret);
2970		return -EINVAL;
2971	}
2972
2973	spin_lock(&hba->device_lock);
2974	if (!list_empty(&hba->hba_dev_list)) {
2975		pr_err("Unable to set hba_mode with active devices\n");
2976		spin_unlock(&hba->device_lock);
2977		return -EINVAL;
2978	}
2979	spin_unlock(&hba->device_lock);
2980
2981	ret = transport->pmode_enable_hba(hba, mode_flag);
2982	if (ret < 0)
2983		return -EINVAL;
2984	if (ret > 0)
2985		hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
2986	else if (ret == 0)
2987		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
2988
2989	return count;
2990}
2991
2992SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
2993
2994CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
2995
2996static void target_core_hba_release(struct config_item *item)
2997{
2998	struct se_hba *hba = container_of(to_config_group(item),
2999				struct se_hba, hba_group);
3000	core_delete_hba(hba);
3001}
3002
3003static struct configfs_attribute *target_core_hba_attrs[] = {
3004	&target_core_hba_hba_info.attr,
3005	&target_core_hba_hba_mode.attr,
3006	NULL,
3007};
3008
3009static struct configfs_item_operations target_core_hba_item_ops = {
3010	.release		= target_core_hba_release,
3011	.show_attribute		= target_core_hba_attr_show,
3012	.store_attribute	= target_core_hba_attr_store,
3013};
3014
3015static struct config_item_type target_core_hba_cit = {
3016	.ct_item_ops		= &target_core_hba_item_ops,
3017	.ct_group_ops		= &target_core_hba_group_ops,
3018	.ct_attrs		= target_core_hba_attrs,
3019	.ct_owner		= THIS_MODULE,
3020};
3021
3022static struct config_group *target_core_call_addhbatotarget(
3023	struct config_group *group,
3024	const char *name)
3025{
3026	char *se_plugin_str, *str, *str2;
3027	struct se_hba *hba;
3028	char buf[TARGET_CORE_NAME_MAX_LEN];
3029	unsigned long plugin_dep_id = 0;
3030	int ret;
3031
3032	memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3033	if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3034		pr_err("Passed *name strlen(): %d exceeds"
3035			" TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3036			TARGET_CORE_NAME_MAX_LEN);
3037		return ERR_PTR(-ENAMETOOLONG);
3038	}
3039	snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3040
3041	str = strstr(buf, "_");
3042	if (!str) {
3043		pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3044		return ERR_PTR(-EINVAL);
3045	}
3046	se_plugin_str = buf;
3047	/*
3048	 * Special case for subsystem plugins that have "_" in their names.
3049	 * Namely rd_direct and rd_mcp..
3050	 */
3051	str2 = strstr(str+1, "_");
3052	if (str2) {
3053		*str2 = '\0'; /* Terminate for *se_plugin_str */
3054		str2++; /* Skip to start of plugin dependent ID */
3055		str = str2;
3056	} else {
3057		*str = '\0'; /* Terminate for *se_plugin_str */
3058		str++; /* Skip to start of plugin dependent ID */
3059	}
3060
3061	ret = strict_strtoul(str, 0, &plugin_dep_id);
3062	if (ret < 0) {
3063		pr_err("strict_strtoul() returned %d for"
3064				" plugin_dep_id\n", ret);
3065		return ERR_PTR(-EINVAL);
3066	}
3067	/*
3068	 * Load up TCM subsystem plugins if they have not already been loaded.
3069	 */
3070	transport_subsystem_check_init();
3071
3072	hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3073	if (IS_ERR(hba))
3074		return ERR_CAST(hba);
3075
3076	config_group_init_type_name(&hba->hba_group, name,
3077			&target_core_hba_cit);
3078
3079	return &hba->hba_group;
3080}
3081
3082static void target_core_call_delhbafromtarget(
3083	struct config_group *group,
3084	struct config_item *item)
3085{
3086	/*
3087	 * core_delete_hba() is called from target_core_hba_item_ops->release()
3088	 * -> target_core_hba_release()
3089	 */
3090	config_item_put(item);
3091}
3092
3093static struct configfs_group_operations target_core_group_ops = {
3094	.make_group	= target_core_call_addhbatotarget,
3095	.drop_item	= target_core_call_delhbafromtarget,
3096};
3097
3098static struct config_item_type target_core_cit = {
3099	.ct_item_ops	= NULL,
3100	.ct_group_ops	= &target_core_group_ops,
3101	.ct_attrs	= NULL,
3102	.ct_owner	= THIS_MODULE,
3103};
3104
3105/* Stop functions for struct config_item_type target_core_hba_cit */
3106
3107static int __init target_core_init_configfs(void)
3108{
3109	struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
3110	struct config_group *lu_gp_cg = NULL;
3111	struct configfs_subsystem *subsys;
3112	struct t10_alua_lu_gp *lu_gp;
3113	int ret;
3114
3115	pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3116		" Engine: %s on %s/%s on "UTS_RELEASE"\n",
3117		TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3118
3119	subsys = target_core_subsystem[0];
3120	config_group_init(&subsys->su_group);
3121	mutex_init(&subsys->su_mutex);
3122
3123	ret = init_se_kmem_caches();
3124	if (ret < 0)
3125		return ret;
3126	/*
3127	 * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3128	 * and ALUA Logical Unit Group and Target Port Group infrastructure.
3129	 */
3130	target_cg = &subsys->su_group;
3131	target_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3132				GFP_KERNEL);
3133	if (!target_cg->default_groups) {
3134		pr_err("Unable to allocate target_cg->default_groups\n");
3135		goto out_global;
3136	}
3137
3138	config_group_init_type_name(&target_core_hbagroup,
3139			"core", &target_core_cit);
3140	target_cg->default_groups[0] = &target_core_hbagroup;
3141	target_cg->default_groups[1] = NULL;
3142	/*
3143	 * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3144	 */
3145	hba_cg = &target_core_hbagroup;
3146	hba_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3147				GFP_KERNEL);
3148	if (!hba_cg->default_groups) {
3149		pr_err("Unable to allocate hba_cg->default_groups\n");
3150		goto out_global;
3151	}
3152	config_group_init_type_name(&alua_group,
3153			"alua", &target_core_alua_cit);
3154	hba_cg->default_groups[0] = &alua_group;
3155	hba_cg->default_groups[1] = NULL;
3156	/*
3157	 * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3158	 * groups under /sys/kernel/config/target/core/alua/
3159	 */
3160	alua_cg = &alua_group;
3161	alua_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3162			GFP_KERNEL);
3163	if (!alua_cg->default_groups) {
3164		pr_err("Unable to allocate alua_cg->default_groups\n");
3165		goto out_global;
3166	}
3167
3168	config_group_init_type_name(&alua_lu_gps_group,
3169			"lu_gps", &target_core_alua_lu_gps_cit);
3170	alua_cg->default_groups[0] = &alua_lu_gps_group;
3171	alua_cg->default_groups[1] = NULL;
3172	/*
3173	 * Add core/alua/lu_gps/default_lu_gp
3174	 */
3175	lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3176	if (IS_ERR(lu_gp))
3177		goto out_global;
3178
3179	lu_gp_cg = &alua_lu_gps_group;
3180	lu_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3181			GFP_KERNEL);
3182	if (!lu_gp_cg->default_groups) {
3183		pr_err("Unable to allocate lu_gp_cg->default_groups\n");
3184		goto out_global;
3185	}
3186
3187	config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3188				&target_core_alua_lu_gp_cit);
3189	lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
3190	lu_gp_cg->default_groups[1] = NULL;
3191	default_lu_gp = lu_gp;
3192	/*
3193	 * Register the target_core_mod subsystem with configfs.
3194	 */
3195	ret = configfs_register_subsystem(subsys);
3196	if (ret < 0) {
3197		pr_err("Error %d while registering subsystem %s\n",
3198			ret, subsys->su_group.cg_item.ci_namebuf);
3199		goto out_global;
3200	}
3201	pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3202		" Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
3203		" on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3204	/*
3205	 * Register built-in RAMDISK subsystem logic for virtual LUN 0
3206	 */
3207	ret = rd_module_init();
3208	if (ret < 0)
3209		goto out;
3210
3211	if (core_dev_setup_virtual_lun0() < 0)
3212		goto out;
3213
3214	return 0;
3215
3216out:
3217	configfs_unregister_subsystem(subsys);
3218	core_dev_release_virtual_lun0();
3219	rd_module_exit();
3220out_global:
3221	if (default_lu_gp) {
3222		core_alua_free_lu_gp(default_lu_gp);
3223		default_lu_gp = NULL;
3224	}
3225	if (lu_gp_cg)
3226		kfree(lu_gp_cg->default_groups);
3227	if (alua_cg)
3228		kfree(alua_cg->default_groups);
3229	if (hba_cg)
3230		kfree(hba_cg->default_groups);
3231	kfree(target_cg->default_groups);
3232	release_se_kmem_caches();
3233	return ret;
3234}
3235
3236static void __exit target_core_exit_configfs(void)
3237{
3238	struct configfs_subsystem *subsys;
3239	struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
3240	struct config_item *item;
3241	int i;
3242
3243	subsys = target_core_subsystem[0];
3244
3245	lu_gp_cg = &alua_lu_gps_group;
3246	for (i = 0; lu_gp_cg->default_groups[i]; i++) {
3247		item = &lu_gp_cg->default_groups[i]->cg_item;
3248		lu_gp_cg->default_groups[i] = NULL;
3249		config_item_put(item);
3250	}
3251	kfree(lu_gp_cg->default_groups);
3252	lu_gp_cg->default_groups = NULL;
3253
3254	alua_cg = &alua_group;
3255	for (i = 0; alua_cg->default_groups[i]; i++) {
3256		item = &alua_cg->default_groups[i]->cg_item;
3257		alua_cg->default_groups[i] = NULL;
3258		config_item_put(item);
3259	}
3260	kfree(alua_cg->default_groups);
3261	alua_cg->default_groups = NULL;
3262
3263	hba_cg = &target_core_hbagroup;
3264	for (i = 0; hba_cg->default_groups[i]; i++) {
3265		item = &hba_cg->default_groups[i]->cg_item;
3266		hba_cg->default_groups[i] = NULL;
3267		config_item_put(item);
3268	}
3269	kfree(hba_cg->default_groups);
3270	hba_cg->default_groups = NULL;
3271	/*
3272	 * We expect subsys->su_group.default_groups to be released
3273	 * by configfs subsystem provider logic..
3274	 */
3275	configfs_unregister_subsystem(subsys);
3276	kfree(subsys->su_group.default_groups);
3277
3278	core_alua_free_lu_gp(default_lu_gp);
3279	default_lu_gp = NULL;
3280
3281	pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3282			" Infrastructure\n");
3283
3284	core_dev_release_virtual_lun0();
3285	rd_module_exit();
3286	release_se_kmem_caches();
3287}
3288
3289MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3290MODULE_AUTHOR("nab@Linux-iSCSI.org");
3291MODULE_LICENSE("GPL");
3292
3293module_init(target_core_init_configfs);
3294module_exit(target_core_exit_configfs);