drivers/target/target_core_configfs.c

   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_device.h>
  43 #include <target/target_core_transport.h>
  44 #include <target/target_core_fabric_ops.h>
  45 #include <target/target_core_fabric_configfs.h>
  46 #include <target/target_core_configfs.h>
  47 #include <target/configfs_macros.h>
  48
  49 #include "target_core_internal.h"
  50 #include "target_core_alua.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_rd.h"
  53
  54 extern struct t10_alua_lu_gp *default_lu_gp;
  55
  56 static struct list_head g_tf_list;
  57 static struct mutex g_tf_lock;
  58
  59 struct target_core_configfs_attribute {
  60         struct configfs_attribute attr;
  61         ssize_t (*show)(void *, char *);
  62         ssize_t (*store)(void *, const char *, size_t);
  63 };
  64
  65 static struct config_group target_core_hbagroup;
  66 static struct config_group alua_group;
  67 static struct config_group alua_lu_gps_group;
  68
  69 static inline struct se_hba *
  70 item_to_hba(struct config_item *item)
  71 {
  72         return container_of(to_config_group(item), struct se_hba, hba_group);
  73 }
  74
  75 /*
  76  * Attributes for /sys/kernel/config/target/
  77  */
  78 static ssize_t target_core_attr_show(struct config_item *item,
  79                                       struct configfs_attribute *attr,
  80                                       char *page)
  81 {
  82         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  83                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
  84                 utsname()->sysname, utsname()->machine);
  85 }
  86
  87 static struct configfs_item_operations target_core_fabric_item_ops = {
  88         .show_attribute = target_core_attr_show,
  89 };
  90
  91 static struct configfs_attribute target_core_item_attr_version = {
  92         .ca_owner       = THIS_MODULE,
  93         .ca_name        = "version",
  94         .ca_mode        = S_IRUGO,
  95 };
  96
  97 static struct target_fabric_configfs *target_core_get_fabric(
  98         const char *name)
  99 {
 100         struct target_fabric_configfs *tf;
 101
 102         if (!name)
 103                 return NULL;
 104
 105         mutex_lock(&g_tf_lock);
 106         list_for_each_entry(tf, &g_tf_list, tf_list) {
 107                 if (!strcmp(tf->tf_name, name)) {
 108                         atomic_inc(&tf->tf_access_cnt);
 109                         mutex_unlock(&g_tf_lock);
 110                         return tf;
 111                 }
 112         }
 113         mutex_unlock(&g_tf_lock);
 114
 115         return NULL;
 116 }
 117
 118 /*
 119  * Called from struct target_core_group_ops->make_group()
 120  */
 121 static struct config_group *target_core_register_fabric(
 122         struct config_group *group,
 123         const char *name)
 124 {
 125         struct target_fabric_configfs *tf;
 126         int ret;
 127
 128         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 129                         " %s\n", group, name);
 130         /*
 131          * Below are some hardcoded request_module() calls to automatically
 132          * local fabric modules when the following is called:
 133          *
 134          * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 135          *
 136          * Note that this does not limit which TCM fabric module can be
 137          * registered, but simply provids auto loading logic for modules with
 138          * mkdir(2) system calls with known TCM fabric modules.
 139          */
 140         if (!strncmp(name, "iscsi", 5)) {
 141                 /*
 142                  * Automatically load the LIO Target fabric module when the
 143                  * following is called:
 144                  *
 145                  * mkdir -p $CONFIGFS/target/iscsi
 146                  */
 147                 ret = request_module("iscsi_target_mod");
 148                 if (ret < 0) {
 149                         pr_err("request_module() failed for"
 150                                 " iscsi_target_mod.ko: %d\n", ret);
 151                         return ERR_PTR(-EINVAL);
 152                 }
 153         } else if (!strncmp(name, "loopback", 8)) {
 154                 /*
 155                  * Automatically load the tcm_loop fabric module when the
 156                  * following is called:
 157                  *
 158                  * mkdir -p $CONFIGFS/target/loopback
 159                  */
 160                 ret = request_module("tcm_loop");
 161                 if (ret < 0) {
 162                         pr_err("request_module() failed for"
 163                                 " tcm_loop.ko: %d\n", ret);
 164                         return ERR_PTR(-EINVAL);
 165                 }
 166         }
 167
 168         tf = target_core_get_fabric(name);
 169         if (!tf) {
 170                 pr_err("target_core_get_fabric() failed for %s\n",
 171                         name);
 172                 return ERR_PTR(-EINVAL);
 173         }
 174         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 175                         " %s\n", tf->tf_name);
 176         /*
 177          * On a successful target_core_get_fabric() look, the returned
 178          * struct target_fabric_configfs *tf will contain a usage reference.
 179          */
 180         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 181                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 182
 183         tf->tf_group.default_groups = tf->tf_default_groups;
 184         tf->tf_group.default_groups[0] = &tf->tf_disc_group;
 185         tf->tf_group.default_groups[1] = NULL;
 186
 187         config_group_init_type_name(&tf->tf_group, name,
 188                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 189         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 190                         &TF_CIT_TMPL(tf)->tfc_discovery_cit);
 191
 192         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 193                         " %s\n", tf->tf_group.cg_item.ci_name);
 194         /*
 195          * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
 196          */
 197         tf->tf_ops.tf_subsys = tf->tf_subsys;
 198         tf->tf_fabric = &tf->tf_group.cg_item;
 199         pr_debug("Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
 200                         " for %s\n", name);
 201
 202         return &tf->tf_group;
 203 }
 204
 205 /*
 206  * Called from struct target_core_group_ops->drop_item()
 207  */
 208 static void target_core_deregister_fabric(
 209         struct config_group *group,
 210         struct config_item *item)
 211 {
 212         struct target_fabric_configfs *tf = container_of(
 213                 to_config_group(item), struct target_fabric_configfs, tf_group);
 214         struct config_group *tf_group;
 215         struct config_item *df_item;
 216         int i;
 217
 218         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 219                 " tf list\n", config_item_name(item));
 220
 221         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 222                         " %s\n", tf->tf_name);
 223         atomic_dec(&tf->tf_access_cnt);
 224
 225         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing"
 226                         " tf->tf_fabric for %s\n", tf->tf_name);
 227         tf->tf_fabric = NULL;
 228
 229         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 230                         " %s\n", config_item_name(item));
 231
 232         tf_group = &tf->tf_group;
 233         for (i = 0; tf_group->default_groups[i]; i++) {
 234                 df_item = &tf_group->default_groups[i]->cg_item;
 235                 tf_group->default_groups[i] = NULL;
 236                 config_item_put(df_item);
 237         }
 238         config_item_put(item);
 239 }
 240
 241 static struct configfs_group_operations target_core_fabric_group_ops = {
 242         .make_group     = &target_core_register_fabric,
 243         .drop_item      = &target_core_deregister_fabric,
 244 };
 245
 246 /*
 247  * All item attributes appearing in /sys/kernel/target/ appear here.
 248  */
 249 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 250         &target_core_item_attr_version,
 251         NULL,
 252 };
 253
 254 /*
 255  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 256  */
 257 static struct config_item_type target_core_fabrics_item = {
 258         .ct_item_ops    = &target_core_fabric_item_ops,
 259         .ct_group_ops   = &target_core_fabric_group_ops,
 260         .ct_attrs       = target_core_fabric_item_attrs,
 261         .ct_owner       = THIS_MODULE,
 262 };
 263
 264 static struct configfs_subsystem target_core_fabrics = {
 265         .su_group = {
 266                 .cg_item = {
 267                         .ci_namebuf = "target",
 268                         .ci_type = &target_core_fabrics_item,
 269                 },
 270         },
 271 };
 272
 273 static struct configfs_subsystem *target_core_subsystem[] = {
 274         &target_core_fabrics,
 275         NULL,
 276 };
 277
 278 /*##############################################################################
 279 // Start functions called by external Target Fabrics Modules
 280 //############################################################################*/
 281
 282 /*
 283  * First function called by fabric modules to:
 284  *
 285  * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
 286  * 2) Add struct target_fabric_configfs to g_tf_list
 287  * 3) Return struct target_fabric_configfs to fabric module to be passed
 288  *    into target_fabric_configfs_register().
 289  */
 290 struct target_fabric_configfs *target_fabric_configfs_init(
 291         struct module *fabric_mod,
 292         const char *name)
 293 {
 294         struct target_fabric_configfs *tf;
 295
 296         if (!(name)) {
 297                 pr_err("Unable to locate passed fabric name\n");
 298                 return ERR_PTR(-EINVAL);
 299         }
 300         if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
 301                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
 302                         "_NAME_SIZE\n", name);
 303                 return ERR_PTR(-EINVAL);
 304         }
 305
 306         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 307         if (!tf)
 308                 return ERR_PTR(-ENOMEM);
 309
 310         INIT_LIST_HEAD(&tf->tf_list);
 311         atomic_set(&tf->tf_access_cnt, 0);
 312         /*
 313          * Setup the default generic struct config_item_type's (cits) in
 314          * struct target_fabric_configfs->tf_cit_tmpl
 315          */
 316         tf->tf_module = fabric_mod;
 317         target_fabric_setup_cits(tf);
 318
 319         tf->tf_subsys = target_core_subsystem[0];
 320         snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
 321
 322         mutex_lock(&g_tf_lock);
 323         list_add_tail(&tf->tf_list, &g_tf_list);
 324         mutex_unlock(&g_tf_lock);
 325
 326         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
 327                         ">>>>>>>>>>>>>>\n");
 328         pr_debug("Initialized struct target_fabric_configfs: %p for"
 329                         " %s\n", tf, tf->tf_name);
 330         return tf;
 331 }
 332 EXPORT_SYMBOL(target_fabric_configfs_init);
 333
 334 /*
 335  * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
 336  */
 337 void target_fabric_configfs_free(
 338         struct target_fabric_configfs *tf)
 339 {
 340         mutex_lock(&g_tf_lock);
 341         list_del(&tf->tf_list);
 342         mutex_unlock(&g_tf_lock);
 343
 344         kfree(tf);
 345 }
 346 EXPORT_SYMBOL(target_fabric_configfs_free);
 347
 348 /*
 349  * Perform a sanity check of the passed tf->tf_ops before completing
 350  * TCM fabric module registration.
 351  */
 352 static int target_fabric_tf_ops_check(
 353         struct target_fabric_configfs *tf)
 354 {
 355         struct target_core_fabric_ops *tfo = &tf->tf_ops;
 356
 357         if (!tfo->get_fabric_name) {
 358                 pr_err("Missing tfo->get_fabric_name()\n");
 359                 return -EINVAL;
 360         }
 361         if (!tfo->get_fabric_proto_ident) {
 362                 pr_err("Missing tfo->get_fabric_proto_ident()\n");
 363                 return -EINVAL;
 364         }
 365         if (!tfo->tpg_get_wwn) {
 366                 pr_err("Missing tfo->tpg_get_wwn()\n");
 367                 return -EINVAL;
 368         }
 369         if (!tfo->tpg_get_tag) {
 370                 pr_err("Missing tfo->tpg_get_tag()\n");
 371                 return -EINVAL;
 372         }
 373         if (!tfo->tpg_get_default_depth) {
 374                 pr_err("Missing tfo->tpg_get_default_depth()\n");
 375                 return -EINVAL;
 376         }
 377         if (!tfo->tpg_get_pr_transport_id) {
 378                 pr_err("Missing tfo->tpg_get_pr_transport_id()\n");
 379                 return -EINVAL;
 380         }
 381         if (!tfo->tpg_get_pr_transport_id_len) {
 382                 pr_err("Missing tfo->tpg_get_pr_transport_id_len()\n");
 383                 return -EINVAL;
 384         }
 385         if (!tfo->tpg_check_demo_mode) {
 386                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
 387                 return -EINVAL;
 388         }
 389         if (!tfo->tpg_check_demo_mode_cache) {
 390                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 391                 return -EINVAL;
 392         }
 393         if (!tfo->tpg_check_demo_mode_write_protect) {
 394                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 395                 return -EINVAL;
 396         }
 397         if (!tfo->tpg_check_prod_mode_write_protect) {
 398                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 399                 return -EINVAL;
 400         }
 401         if (!tfo->tpg_alloc_fabric_acl) {
 402                 pr_err("Missing tfo->tpg_alloc_fabric_acl()\n");
 403                 return -EINVAL;
 404         }
 405         if (!tfo->tpg_release_fabric_acl) {
 406                 pr_err("Missing tfo->tpg_release_fabric_acl()\n");
 407                 return -EINVAL;
 408         }
 409         if (!tfo->tpg_get_inst_index) {
 410                 pr_err("Missing tfo->tpg_get_inst_index()\n");
 411                 return -EINVAL;
 412         }
 413         if (!tfo->release_cmd) {
 414                 pr_err("Missing tfo->release_cmd()\n");
 415                 return -EINVAL;
 416         }
 417         if (!tfo->shutdown_session) {
 418                 pr_err("Missing tfo->shutdown_session()\n");
 419                 return -EINVAL;
 420         }
 421         if (!tfo->close_session) {
 422                 pr_err("Missing tfo->close_session()\n");
 423                 return -EINVAL;
 424         }
 425         if (!tfo->stop_session) {
 426                 pr_err("Missing tfo->stop_session()\n");
 427                 return -EINVAL;
 428         }
 429         if (!tfo->fall_back_to_erl0) {
 430                 pr_err("Missing tfo->fall_back_to_erl0()\n");
 431                 return -EINVAL;
 432         }
 433         if (!tfo->sess_logged_in) {
 434                 pr_err("Missing tfo->sess_logged_in()\n");
 435                 return -EINVAL;
 436         }
 437         if (!tfo->sess_get_index) {
 438                 pr_err("Missing tfo->sess_get_index()\n");
 439                 return -EINVAL;
 440         }
 441         if (!tfo->write_pending) {
 442                 pr_err("Missing tfo->write_pending()\n");
 443                 return -EINVAL;
 444         }
 445         if (!tfo->write_pending_status) {
 446                 pr_err("Missing tfo->write_pending_status()\n");
 447                 return -EINVAL;
 448         }
 449         if (!tfo->set_default_node_attributes) {
 450                 pr_err("Missing tfo->set_default_node_attributes()\n");
 451                 return -EINVAL;
 452         }
 453         if (!tfo->get_task_tag) {
 454                 pr_err("Missing tfo->get_task_tag()\n");
 455                 return -EINVAL;
 456         }
 457         if (!tfo->get_cmd_state) {
 458                 pr_err("Missing tfo->get_cmd_state()\n");
 459                 return -EINVAL;
 460         }
 461         if (!tfo->queue_data_in) {
 462                 pr_err("Missing tfo->queue_data_in()\n");
 463                 return -EINVAL;
 464         }
 465         if (!tfo->queue_status) {
 466                 pr_err("Missing tfo->queue_status()\n");
 467                 return -EINVAL;
 468         }
 469         if (!tfo->queue_tm_rsp) {
 470                 pr_err("Missing tfo->queue_tm_rsp()\n");
 471                 return -EINVAL;
 472         }
 473         if (!tfo->set_fabric_sense_len) {
 474                 pr_err("Missing tfo->set_fabric_sense_len()\n");
 475                 return -EINVAL;
 476         }
 477         if (!tfo->get_fabric_sense_len) {
 478                 pr_err("Missing tfo->get_fabric_sense_len()\n");
 479                 return -EINVAL;
 480         }
 481         if (!tfo->is_state_remove) {
 482                 pr_err("Missing tfo->is_state_remove()\n");
 483                 return -EINVAL;
 484         }
 485         /*
 486          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 487          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 488          * target_core_fabric_configfs.c WWN+TPG group context code.
 489          */
 490         if (!tfo->fabric_make_wwn) {
 491                 pr_err("Missing tfo->fabric_make_wwn()\n");
 492                 return -EINVAL;
 493         }
 494         if (!tfo->fabric_drop_wwn) {
 495                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 496                 return -EINVAL;
 497         }
 498         if (!tfo->fabric_make_tpg) {
 499                 pr_err("Missing tfo->fabric_make_tpg()\n");
 500                 return -EINVAL;
 501         }
 502         if (!tfo->fabric_drop_tpg) {
 503                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 504                 return -EINVAL;
 505         }
 506
 507         return 0;
 508 }
 509
 510 /*
 511  * Called 2nd from fabric module with returned parameter of
 512  * struct target_fabric_configfs * from target_fabric_configfs_init().
 513  *
 514  * Upon a successful registration, the new fabric's struct config_item is
 515  * return.  Also, a pointer to this struct is set in the passed
 516  * struct target_fabric_configfs.
 517  */
 518 int target_fabric_configfs_register(
 519         struct target_fabric_configfs *tf)
 520 {
 521         int ret;
 522
 523         if (!tf) {
 524                 pr_err("Unable to locate target_fabric_configfs"
 525                         " pointer\n");
 526                 return -EINVAL;
 527         }
 528         if (!tf->tf_subsys) {
 529                 pr_err("Unable to target struct config_subsystem"
 530                         " pointer\n");
 531                 return -EINVAL;
 532         }
 533         ret = target_fabric_tf_ops_check(tf);
 534         if (ret < 0)
 535                 return ret;
 536
 537         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
 538                 ">>>>>>>>>>\n");
 539         return 0;
 540 }
 541 EXPORT_SYMBOL(target_fabric_configfs_register);
 542
 543 void target_fabric_configfs_deregister(
 544         struct target_fabric_configfs *tf)
 545 {
 546         struct configfs_subsystem *su;
 547
 548         if (!tf) {
 549                 pr_err("Unable to locate passed target_fabric_"
 550                         "configfs\n");
 551                 return;
 552         }
 553         su = tf->tf_subsys;
 554         if (!su) {
 555                 pr_err("Unable to locate passed tf->tf_subsys"
 556                         " pointer\n");
 557                 return;
 558         }
 559         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
 560                         ">>>>>>>>>>>>\n");
 561         mutex_lock(&g_tf_lock);
 562         if (atomic_read(&tf->tf_access_cnt)) {
 563                 mutex_unlock(&g_tf_lock);
 564                 pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
 565                         tf->tf_name);
 566                 BUG();
 567         }
 568         list_del(&tf->tf_list);
 569         mutex_unlock(&g_tf_lock);
 570
 571         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
 572                         " %s\n", tf->tf_name);
 573         tf->tf_module = NULL;
 574         tf->tf_subsys = NULL;
 575         kfree(tf);
 576
 577         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
 578                         ">>>>>\n");
 579 }
 580 EXPORT_SYMBOL(target_fabric_configfs_deregister);
 581
 582 /*##############################################################################
 583 // Stop functions called by external Target Fabrics Modules
 584 //############################################################################*/
 585
 586 /* Start functions for struct config_item_type target_core_dev_attrib_cit */
 587
 588 #define DEF_DEV_ATTRIB_SHOW(_name)                                      \
 589 static ssize_t target_core_dev_show_attr_##_name(                       \
 590         struct se_dev_attrib *da,                                       \
 591         char *page)                                                     \
 592 {                                                                       \
 593         struct se_device *dev;                                          \
 594         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 595         ssize_t rb;                                                     \
 596                                                                         \
 597         spin_lock(&se_dev->se_dev_lock);                                \
 598         dev = se_dev->se_dev_ptr;                                       \
 599         if (!dev) {                                                     \
 600                 spin_unlock(&se_dev->se_dev_lock);                      \
 601                 return -ENODEV;                                         \
 602         }                                                               \
 603         rb = snprintf(page, PAGE_SIZE, "%u\n",                          \
 604                 (u32)dev->se_sub_dev->se_dev_attrib._name);             \
 605         spin_unlock(&se_dev->se_dev_lock);                              \
 606                                                                         \
 607         return rb;                                                      \
 608 }
 609
 610 #define DEF_DEV_ATTRIB_STORE(_name)                                     \
 611 static ssize_t target_core_dev_store_attr_##_name(                      \
 612         struct se_dev_attrib *da,                                       \
 613         const char *page,                                               \
 614         size_t count)                                                   \
 615 {                                                                       \
 616         struct se_device *dev;                                          \
 617         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 618         unsigned long val;                                              \
 619         int ret;                                                        \
 620                                                                         \
 621         spin_lock(&se_dev->se_dev_lock);                                \
 622         dev = se_dev->se_dev_ptr;                                       \
 623         if (!dev) {                                                     \
 624                 spin_unlock(&se_dev->se_dev_lock);                      \
 625                 return -ENODEV;                                         \
 626         }                                                               \
 627         ret = strict_strtoul(page, 0, &val);                            \
 628         if (ret < 0) {                                                  \
 629                 spin_unlock(&se_dev->se_dev_lock);                      \
 630                 pr_err("strict_strtoul() failed with"           \
 631                         " ret: %d\n", ret);                             \
 632                 return -EINVAL;                                         \
 633         }                                                               \
 634         ret = se_dev_set_##_name(dev, (u32)val);                        \
 635         spin_unlock(&se_dev->se_dev_lock);                              \
 636                                                                         \
 637         return (!ret) ? count : -EINVAL;                                \
 638 }
 639
 640 #define DEF_DEV_ATTRIB(_name)                                           \
 641 DEF_DEV_ATTRIB_SHOW(_name);                                             \
 642 DEF_DEV_ATTRIB_STORE(_name);
 643
 644 #define DEF_DEV_ATTRIB_RO(_name)                                        \
 645 DEF_DEV_ATTRIB_SHOW(_name);
 646
 647 CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
 648 #define SE_DEV_ATTR(_name, _mode)                                       \
 649 static struct target_core_dev_attrib_attribute                          \
 650                         target_core_dev_attrib_##_name =                \
 651                 __CONFIGFS_EATTR(_name, _mode,                          \
 652                 target_core_dev_show_attr_##_name,                      \
 653                 target_core_dev_store_attr_##_name);
 654
 655 #define SE_DEV_ATTR_RO(_name);                                          \
 656 static struct target_core_dev_attrib_attribute                          \
 657                         target_core_dev_attrib_##_name =                \
 658         __CONFIGFS_EATTR_RO(_name,                                      \
 659         target_core_dev_show_attr_##_name);
 660
 661 DEF_DEV_ATTRIB(emulate_dpo);
 662 SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
 663
 664 DEF_DEV_ATTRIB(emulate_fua_write);
 665 SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);
 666
 667 DEF_DEV_ATTRIB(emulate_fua_read);
 668 SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);
 669
 670 DEF_DEV_ATTRIB(emulate_write_cache);
 671 SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);
 672
 673 DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
 674 SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
 675
 676 DEF_DEV_ATTRIB(emulate_tas);
 677 SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
 678
 679 DEF_DEV_ATTRIB(emulate_tpu);
 680 SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
 681
 682 DEF_DEV_ATTRIB(emulate_tpws);
 683 SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
 684
 685 DEF_DEV_ATTRIB(enforce_pr_isids);
 686 SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
 687
 688 DEF_DEV_ATTRIB(is_nonrot);
 689 SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
 690
 691 DEF_DEV_ATTRIB(emulate_rest_reord);
 692 SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);
 693
 694 DEF_DEV_ATTRIB_RO(hw_block_size);
 695 SE_DEV_ATTR_RO(hw_block_size);
 696
 697 DEF_DEV_ATTRIB(block_size);
 698 SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
 699
 700 DEF_DEV_ATTRIB_RO(hw_max_sectors);
 701 SE_DEV_ATTR_RO(hw_max_sectors);
 702
 703 DEF_DEV_ATTRIB(max_sectors);
 704 SE_DEV_ATTR(max_sectors, S_IRUGO | S_IWUSR);
 705
 706 DEF_DEV_ATTRIB(optimal_sectors);
 707 SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);
 708
 709 DEF_DEV_ATTRIB_RO(hw_queue_depth);
 710 SE_DEV_ATTR_RO(hw_queue_depth);
 711
 712 DEF_DEV_ATTRIB(queue_depth);
 713 SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
 714
 715 DEF_DEV_ATTRIB(max_unmap_lba_count);
 716 SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
 717
 718 DEF_DEV_ATTRIB(max_unmap_block_desc_count);
 719 SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);
 720
 721 DEF_DEV_ATTRIB(unmap_granularity);
 722 SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
 723
 724 DEF_DEV_ATTRIB(unmap_granularity_alignment);
 725 SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
 726
 727 CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
 728
 729 static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
 730         &target_core_dev_attrib_emulate_dpo.attr,
 731         &target_core_dev_attrib_emulate_fua_write.attr,
 732         &target_core_dev_attrib_emulate_fua_read.attr,
 733         &target_core_dev_attrib_emulate_write_cache.attr,
 734         &target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
 735         &target_core_dev_attrib_emulate_tas.attr,
 736         &target_core_dev_attrib_emulate_tpu.attr,
 737         &target_core_dev_attrib_emulate_tpws.attr,
 738         &target_core_dev_attrib_enforce_pr_isids.attr,
 739         &target_core_dev_attrib_is_nonrot.attr,
 740         &target_core_dev_attrib_emulate_rest_reord.attr,
 741         &target_core_dev_attrib_hw_block_size.attr,
 742         &target_core_dev_attrib_block_size.attr,
 743         &target_core_dev_attrib_hw_max_sectors.attr,
 744         &target_core_dev_attrib_max_sectors.attr,
 745         &target_core_dev_attrib_optimal_sectors.attr,
 746         &target_core_dev_attrib_hw_queue_depth.attr,
 747         &target_core_dev_attrib_queue_depth.attr,
 748         &target_core_dev_attrib_max_unmap_lba_count.attr,
 749         &target_core_dev_attrib_max_unmap_block_desc_count.attr,
 750         &target_core_dev_attrib_unmap_granularity.attr,
 751         &target_core_dev_attrib_unmap_granularity_alignment.attr,
 752         NULL,
 753 };
 754
 755 static struct configfs_item_operations target_core_dev_attrib_ops = {
 756         .show_attribute         = target_core_dev_attrib_attr_show,
 757         .store_attribute        = target_core_dev_attrib_attr_store,
 758 };
 759
 760 static struct config_item_type target_core_dev_attrib_cit = {
 761         .ct_item_ops            = &target_core_dev_attrib_ops,
 762         .ct_attrs               = target_core_dev_attrib_attrs,
 763         .ct_owner               = THIS_MODULE,
 764 };
 765
 766 /* End functions for struct config_item_type target_core_dev_attrib_cit */
 767
 768 /*  Start functions for struct config_item_type target_core_dev_wwn_cit */
 769
 770 CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
 771 #define SE_DEV_WWN_ATTR(_name, _mode)                                   \
 772 static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
 773                 __CONFIGFS_EATTR(_name, _mode,                          \
 774                 target_core_dev_wwn_show_attr_##_name,                  \
 775                 target_core_dev_wwn_store_attr_##_name);
 776
 777 #define SE_DEV_WWN_ATTR_RO(_name);                                      \
 778 do {                                                                    \
 779         static struct target_core_dev_wwn_attribute                     \
 780                         target_core_dev_wwn_##_name =                   \
 781                 __CONFIGFS_EATTR_RO(_name,                              \
 782                 target_core_dev_wwn_show_attr_##_name);                 \
 783 } while (0);
 784
 785 /*
 786  * VPD page 0x80 Unit serial
 787  */
 788 static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
 789         struct t10_wwn *t10_wwn,
 790         char *page)
 791 {
 792         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 793         struct se_device *dev;
 794
 795         dev = se_dev->se_dev_ptr;
 796         if (!dev)
 797                 return -ENODEV;
 798
 799         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
 800                 &t10_wwn->unit_serial[0]);
 801 }
 802
 803 static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
 804         struct t10_wwn *t10_wwn,
 805         const char *page,
 806         size_t count)
 807 {
 808         struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
 809         struct se_device *dev;
 810         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
 811
 812         /*
 813          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
 814          * from the struct scsi_device level firmware, do not allow
 815          * VPD Unit Serial to be emulated.
 816          *
 817          * Note this struct scsi_device could also be emulating VPD
 818          * information from its drivers/scsi LLD.  But for now we assume
 819          * it is doing 'the right thing' wrt a world wide unique
 820          * VPD Unit Serial Number that OS dependent multipath can depend on.
 821          */
 822         if (su_dev->su_dev_flags & SDF_FIRMWARE_VPD_UNIT_SERIAL) {
 823                 pr_err("Underlying SCSI device firmware provided VPD"
 824                         " Unit Serial, ignoring request\n");
 825                 return -EOPNOTSUPP;
 826         }
 827
 828         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
 829                 pr_err("Emulated VPD Unit Serial exceeds"
 830                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
 831                 return -EOVERFLOW;
 832         }
 833         /*
 834          * Check to see if any active $FABRIC_MOD exports exist.  If they
 835          * do exist, fail here as changing this information on the fly
 836          * (underneath the initiator side OS dependent multipath code)
 837          * could cause negative effects.
 838          */
 839         dev = su_dev->se_dev_ptr;
 840         if (dev) {
 841                 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
 842                         pr_err("Unable to set VPD Unit Serial while"
 843                                 " active %d $FABRIC_MOD exports exist\n",
 844                                 atomic_read(&dev->dev_export_obj.obj_access_count));
 845                         return -EINVAL;
 846                 }
 847         }
 848         /*
 849          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
 850          *
 851          * Also, strip any newline added from the userspace
 852          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
 853          */
 854         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
 855         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
 856         snprintf(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
 857                         "%s", strstrip(buf));
 858         su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;
 859
 860         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
 861                         " %s\n", su_dev->t10_wwn.unit_serial);
 862
 863         return count;
 864 }
 865
 866 SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);
 867
 868 /*
 869  * VPD page 0x83 Protocol Identifier
 870  */
 871 static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
 872         struct t10_wwn *t10_wwn,
 873         char *page)
 874 {
 875         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 876         struct se_device *dev;
 877         struct t10_vpd *vpd;
 878         unsigned char buf[VPD_TMP_BUF_SIZE];
 879         ssize_t len = 0;
 880
 881         dev = se_dev->se_dev_ptr;
 882         if (!dev)
 883                 return -ENODEV;
 884
 885         memset(buf, 0, VPD_TMP_BUF_SIZE);
 886
 887         spin_lock(&t10_wwn->t10_vpd_lock);
 888         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
 889                 if (!vpd->protocol_identifier_set)
 890                         continue;
 891
 892                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
 893
 894                 if (len + strlen(buf) >= PAGE_SIZE)
 895                         break;
 896
 897                 len += sprintf(page+len, "%s", buf);
 898         }
 899         spin_unlock(&t10_wwn->t10_vpd_lock);
 900
 901         return len;
 902 }
 903
 904 static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
 905         struct t10_wwn *t10_wwn,
 906         const char *page,
 907         size_t count)
 908 {
 909         return -ENOSYS;
 910 }
 911
 912 SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);
 913
 914 /*
 915  * Generic wrapper for dumping VPD identifiers by association.
 916  */
 917 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
 918 static ssize_t target_core_dev_wwn_show_attr_##_name(                   \
 919         struct t10_wwn *t10_wwn,                                        \
 920         char *page)                                                     \
 921 {                                                                       \
 922         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;         \
 923         struct se_device *dev;                                          \
 924         struct t10_vpd *vpd;                                                    \
 925         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
 926         ssize_t len = 0;                                                \
 927                                                                         \
 928         dev = se_dev->se_dev_ptr;                                       \
 929         if (!dev)                                                       \
 930                 return -ENODEV;                                         \
 931                                                                         \
 932         spin_lock(&t10_wwn->t10_vpd_lock);                              \
 933         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
 934                 if (vpd->association != _assoc)                         \
 935                         continue;                                       \
 936                                                                         \
 937                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 938                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
 939                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 940                         break;                                          \
 941                 len += sprintf(page+len, "%s", buf);                    \
 942                                                                         \
 943                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 944                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
 945                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 946                         break;                                          \
 947                 len += sprintf(page+len, "%s", buf);                    \
 948                                                                         \
 949                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 950                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
 951                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 952                         break;                                          \
 953                 len += sprintf(page+len, "%s", buf);                    \
 954         }                                                               \
 955         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
 956                                                                         \
 957         return len;                                                     \
 958 }
 959
 960 /*
 961  * VPD page 0x83 Association: Logical Unit
 962  */
 963 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
 964
 965 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
 966         struct t10_wwn *t10_wwn,
 967         const char *page,
 968         size_t count)
 969 {
 970         return -ENOSYS;
 971 }
 972
 973 SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);
 974
 975 /*
 976  * VPD page 0x83 Association: Target Port
 977  */
 978 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
 979
 980 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
 981         struct t10_wwn *t10_wwn,
 982         const char *page,
 983         size_t count)
 984 {
 985         return -ENOSYS;
 986 }
 987
 988 SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);
 989
 990 /*
 991  * VPD page 0x83 Association: SCSI Target Device
 992  */
 993 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
 994
 995 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
 996         struct t10_wwn *t10_wwn,
 997         const char *page,
 998         size_t count)
 999 {
1000         return -ENOSYS;
1001 }
1002
1003 SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);
1004
1005 CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);
1006
1007 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1008         &target_core_dev_wwn_vpd_unit_serial.attr,
1009         &target_core_dev_wwn_vpd_protocol_identifier.attr,
1010         &target_core_dev_wwn_vpd_assoc_logical_unit.attr,
1011         &target_core_dev_wwn_vpd_assoc_target_port.attr,
1012         &target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
1013         NULL,
1014 };
1015
1016 static struct configfs_item_operations target_core_dev_wwn_ops = {
1017         .show_attribute         = target_core_dev_wwn_attr_show,
1018         .store_attribute        = target_core_dev_wwn_attr_store,
1019 };
1020
1021 static struct config_item_type target_core_dev_wwn_cit = {
1022         .ct_item_ops            = &target_core_dev_wwn_ops,
1023         .ct_attrs               = target_core_dev_wwn_attrs,
1024         .ct_owner               = THIS_MODULE,
1025 };
1026
1027 /*  End functions for struct config_item_type target_core_dev_wwn_cit */
1028
1029 /*  Start functions for struct config_item_type target_core_dev_pr_cit */
1030
1031 CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_subsystem_dev);
1032 #define SE_DEV_PR_ATTR(_name, _mode)                                    \
1033 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1034         __CONFIGFS_EATTR(_name, _mode,                                  \
1035         target_core_dev_pr_show_attr_##_name,                           \
1036         target_core_dev_pr_store_attr_##_name);
1037
1038 #define SE_DEV_PR_ATTR_RO(_name);                                       \
1039 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1040         __CONFIGFS_EATTR_RO(_name,                                      \
1041         target_core_dev_pr_show_attr_##_name);
1042
1043 /*
1044  * res_holder
1045  */
1046 static ssize_t target_core_dev_pr_show_spc3_res(
1047         struct se_device *dev,
1048         char *page,
1049         ssize_t *len)
1050 {
1051         struct se_node_acl *se_nacl;
1052         struct t10_pr_registration *pr_reg;
1053         char i_buf[PR_REG_ISID_ID_LEN];
1054         int prf_isid;
1055
1056         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1057
1058         spin_lock(&dev->dev_reservation_lock);
1059         pr_reg = dev->dev_pr_res_holder;
1060         if (!pr_reg) {
1061                 *len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
1062                 spin_unlock(&dev->dev_reservation_lock);
1063                 return *len;
1064         }
1065         se_nacl = pr_reg->pr_reg_nacl;
1066         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1067                                 PR_REG_ISID_ID_LEN);
1068
1069         *len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
1070                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1071                 se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
1072         spin_unlock(&dev->dev_reservation_lock);
1073
1074         return *len;
1075 }
1076
1077 static ssize_t target_core_dev_pr_show_spc2_res(
1078         struct se_device *dev,
1079         char *page,
1080         ssize_t *len)
1081 {
1082         struct se_node_acl *se_nacl;
1083
1084         spin_lock(&dev->dev_reservation_lock);
1085         se_nacl = dev->dev_reserved_node_acl;
1086         if (!se_nacl) {
1087                 *len += sprintf(page + *len, "No SPC-2 Reservation holder\n");
1088                 spin_unlock(&dev->dev_reservation_lock);
1089                 return *len;
1090         }
1091         *len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",
1092                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1093                 se_nacl->initiatorname);
1094         spin_unlock(&dev->dev_reservation_lock);
1095
1096         return *len;
1097 }
1098
1099 static ssize_t target_core_dev_pr_show_attr_res_holder(
1100         struct se_subsystem_dev *su_dev,
1101         char *page)
1102 {
1103         ssize_t len = 0;
1104
1105         if (!su_dev->se_dev_ptr)
1106                 return -ENODEV;
1107
1108         switch (su_dev->t10_pr.res_type) {
1109         case SPC3_PERSISTENT_RESERVATIONS:
1110                 target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
1111                                 page, &len);
1112                 break;
1113         case SPC2_RESERVATIONS:
1114                 target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
1115                                 page, &len);
1116                 break;
1117         case SPC_PASSTHROUGH:
1118                 len += sprintf(page+len, "Passthrough\n");
1119                 break;
1120         default:
1121                 len += sprintf(page+len, "Unknown\n");
1122                 break;
1123         }
1124
1125         return len;
1126 }
1127
1128 SE_DEV_PR_ATTR_RO(res_holder);
1129
1130 /*
1131  * res_pr_all_tgt_pts
1132  */
1133 static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
1134         struct se_subsystem_dev *su_dev,
1135         char *page)
1136 {
1137         struct se_device *dev;
1138         struct t10_pr_registration *pr_reg;
1139         ssize_t len = 0;
1140
1141         dev = su_dev->se_dev_ptr;
1142         if (!dev)
1143                 return -ENODEV;
1144
1145         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1146                 return len;
1147
1148         spin_lock(&dev->dev_reservation_lock);
1149         pr_reg = dev->dev_pr_res_holder;
1150         if (!pr_reg) {
1151                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1152                 spin_unlock(&dev->dev_reservation_lock);
1153                 return len;
1154         }
1155         /*
1156          * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
1157          * Basic PERSISTENT RESERVER OUT parameter list, page 290
1158          */
1159         if (pr_reg->pr_reg_all_tg_pt)
1160                 len = sprintf(page, "SPC-3 Reservation: All Target"
1161                         " Ports registration\n");
1162         else
1163                 len = sprintf(page, "SPC-3 Reservation: Single"
1164                         " Target Port registration\n");
1165         spin_unlock(&dev->dev_reservation_lock);
1166
1167         return len;
1168 }
1169
1170 SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);
1171
1172 /*
1173  * res_pr_generation
1174  */
1175 static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
1176         struct se_subsystem_dev *su_dev,
1177         char *page)
1178 {
1179         if (!su_dev->se_dev_ptr)
1180                 return -ENODEV;
1181
1182         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1183                 return 0;
1184
1185         return sprintf(page, "0x%08x\n", su_dev->t10_pr.pr_generation);
1186 }
1187
1188 SE_DEV_PR_ATTR_RO(res_pr_generation);
1189
1190 /*
1191  * res_pr_holder_tg_port
1192  */
1193 static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
1194         struct se_subsystem_dev *su_dev,
1195         char *page)
1196 {
1197         struct se_device *dev;
1198         struct se_node_acl *se_nacl;
1199         struct se_lun *lun;
1200         struct se_portal_group *se_tpg;
1201         struct t10_pr_registration *pr_reg;
1202         struct target_core_fabric_ops *tfo;
1203         ssize_t len = 0;
1204
1205         dev = su_dev->se_dev_ptr;
1206         if (!dev)
1207                 return -ENODEV;
1208
1209         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1210                 return len;
1211
1212         spin_lock(&dev->dev_reservation_lock);
1213         pr_reg = dev->dev_pr_res_holder;
1214         if (!pr_reg) {
1215                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1216                 spin_unlock(&dev->dev_reservation_lock);
1217                 return len;
1218         }
1219         se_nacl = pr_reg->pr_reg_nacl;
1220         se_tpg = se_nacl->se_tpg;
1221         lun = pr_reg->pr_reg_tg_pt_lun;
1222         tfo = se_tpg->se_tpg_tfo;
1223
1224         len += sprintf(page+len, "SPC-3 Reservation: %s"
1225                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1226                 tfo->tpg_get_wwn(se_tpg));
1227         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1228                 " Identifer Tag: %hu %s Portal Group Tag: %hu"
1229                 " %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
1230                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1231                 tfo->get_fabric_name(), lun->unpacked_lun);
1232         spin_unlock(&dev->dev_reservation_lock);
1233
1234         return len;
1235 }
1236
1237 SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);
1238
1239 /*
1240  * res_pr_registered_i_pts
1241  */
1242 static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
1243         struct se_subsystem_dev *su_dev,
1244         char *page)
1245 {
1246         struct target_core_fabric_ops *tfo;
1247         struct t10_pr_registration *pr_reg;
1248         unsigned char buf[384];
1249         char i_buf[PR_REG_ISID_ID_LEN];
1250         ssize_t len = 0;
1251         int reg_count = 0, prf_isid;
1252
1253         if (!su_dev->se_dev_ptr)
1254                 return -ENODEV;
1255
1256         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1257                 return len;
1258
1259         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1260
1261         spin_lock(&su_dev->t10_pr.registration_lock);
1262         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1263                         pr_reg_list) {
1264
1265                 memset(buf, 0, 384);
1266                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1267                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1268                 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1269                                         PR_REG_ISID_ID_LEN);
1270                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1271                         tfo->get_fabric_name(),
1272                         pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
1273                         &i_buf[0] : "", pr_reg->pr_res_key,
1274                         pr_reg->pr_res_generation);
1275
1276                 if (len + strlen(buf) >= PAGE_SIZE)
1277                         break;
1278
1279                 len += sprintf(page+len, "%s", buf);
1280                 reg_count++;
1281         }
1282         spin_unlock(&su_dev->t10_pr.registration_lock);
1283
1284         if (!reg_count)
1285                 len += sprintf(page+len, "None\n");
1286
1287         return len;
1288 }
1289
1290 SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);
1291
1292 /*
1293  * res_pr_type
1294  */
1295 static ssize_t target_core_dev_pr_show_attr_res_pr_type(
1296         struct se_subsystem_dev *su_dev,
1297         char *page)
1298 {
1299         struct se_device *dev;
1300         struct t10_pr_registration *pr_reg;
1301         ssize_t len = 0;
1302
1303         dev = su_dev->se_dev_ptr;
1304         if (!dev)
1305                 return -ENODEV;
1306
1307         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1308                 return len;
1309
1310         spin_lock(&dev->dev_reservation_lock);
1311         pr_reg = dev->dev_pr_res_holder;
1312         if (!pr_reg) {
1313                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1314                 spin_unlock(&dev->dev_reservation_lock);
1315                 return len;
1316         }
1317         len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1318                 core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1319         spin_unlock(&dev->dev_reservation_lock);
1320
1321         return len;
1322 }
1323
1324 SE_DEV_PR_ATTR_RO(res_pr_type);
1325
1326 /*
1327  * res_type
1328  */
1329 static ssize_t target_core_dev_pr_show_attr_res_type(
1330         struct se_subsystem_dev *su_dev,
1331         char *page)
1332 {
1333         ssize_t len = 0;
1334
1335         if (!su_dev->se_dev_ptr)
1336                 return -ENODEV;
1337
1338         switch (su_dev->t10_pr.res_type) {
1339         case SPC3_PERSISTENT_RESERVATIONS:
1340                 len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1341                 break;
1342         case SPC2_RESERVATIONS:
1343                 len = sprintf(page, "SPC2_RESERVATIONS\n");
1344                 break;
1345         case SPC_PASSTHROUGH:
1346                 len = sprintf(page, "SPC_PASSTHROUGH\n");
1347                 break;
1348         default:
1349                 len = sprintf(page, "UNKNOWN\n");
1350                 break;
1351         }
1352
1353         return len;
1354 }
1355
1356 SE_DEV_PR_ATTR_RO(res_type);
1357
1358 /*
1359  * res_aptpl_active
1360  */
1361
1362 static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
1363         struct se_subsystem_dev *su_dev,
1364         char *page)
1365 {
1366         if (!su_dev->se_dev_ptr)
1367                 return -ENODEV;
1368
1369         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1370                 return 0;
1371
1372         return sprintf(page, "APTPL Bit Status: %s\n",
1373                 (su_dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1374 }
1375
1376 SE_DEV_PR_ATTR_RO(res_aptpl_active);
1377
1378 /*
1379  * res_aptpl_metadata
1380  */
1381 static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
1382         struct se_subsystem_dev *su_dev,
1383         char *page)
1384 {
1385         if (!su_dev->se_dev_ptr)
1386                 return -ENODEV;
1387
1388         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1389                 return 0;
1390
1391         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1392 }
1393
1394 enum {
1395         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1396         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1397         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1398         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1399 };
1400
1401 static match_table_t tokens = {
1402         {Opt_initiator_fabric, "initiator_fabric=%s"},
1403         {Opt_initiator_node, "initiator_node=%s"},
1404         {Opt_initiator_sid, "initiator_sid=%s"},
1405         {Opt_sa_res_key, "sa_res_key=%s"},
1406         {Opt_res_holder, "res_holder=%d"},
1407         {Opt_res_type, "res_type=%d"},
1408         {Opt_res_scope, "res_scope=%d"},
1409         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1410         {Opt_mapped_lun, "mapped_lun=%d"},
1411         {Opt_target_fabric, "target_fabric=%s"},
1412         {Opt_target_node, "target_node=%s"},
1413         {Opt_tpgt, "tpgt=%d"},
1414         {Opt_port_rtpi, "port_rtpi=%d"},
1415         {Opt_target_lun, "target_lun=%d"},
1416         {Opt_err, NULL}
1417 };
1418
1419 static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
1420         struct se_subsystem_dev *su_dev,
1421         const char *page,
1422         size_t count)
1423 {
1424         struct se_device *dev;
1425         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1426         unsigned char *t_fabric = NULL, *t_port = NULL;
1427         char *orig, *ptr, *arg_p, *opts;
1428         substring_t args[MAX_OPT_ARGS];
1429         unsigned long long tmp_ll;
1430         u64 sa_res_key = 0;
1431         u32 mapped_lun = 0, target_lun = 0;
1432         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1433         u16 port_rpti = 0, tpgt = 0;
1434         u8 type = 0, scope;
1435
1436         dev = su_dev->se_dev_ptr;
1437         if (!dev)
1438                 return -ENODEV;
1439
1440         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1441                 return 0;
1442
1443         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1444                 pr_debug("Unable to process APTPL metadata while"
1445                         " active fabric exports exist\n");
1446                 return -EINVAL;
1447         }
1448
1449         opts = kstrdup(page, GFP_KERNEL);
1450         if (!opts)
1451                 return -ENOMEM;
1452
1453         orig = opts;
1454         while ((ptr = strsep(&opts, ",")) != NULL) {
1455                 if (!*ptr)
1456                         continue;
1457
1458                 token = match_token(ptr, tokens, args);
1459                 switch (token) {
1460                 case Opt_initiator_fabric:
1461                         i_fabric = match_strdup(&args[0]);
1462                         if (!i_fabric) {
1463                                 ret = -ENOMEM;
1464                                 goto out;
1465                         }
1466                         break;
1467                 case Opt_initiator_node:
1468                         i_port = match_strdup(&args[0]);
1469                         if (!i_port) {
1470                                 ret = -ENOMEM;
1471                                 goto out;
1472                         }
1473                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1474                                 pr_err("APTPL metadata initiator_node="
1475                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1476                                         PR_APTPL_MAX_IPORT_LEN);
1477                                 ret = -EINVAL;
1478                                 break;
1479                         }
1480                         break;
1481                 case Opt_initiator_sid:
1482                         isid = match_strdup(&args[0]);
1483                         if (!isid) {
1484                                 ret = -ENOMEM;
1485                                 goto out;
1486                         }
1487                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1488                                 pr_err("APTPL metadata initiator_isid"
1489                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1490                                         PR_REG_ISID_LEN);
1491                                 ret = -EINVAL;
1492                                 break;
1493                         }
1494                         break;
1495                 case Opt_sa_res_key:
1496                         arg_p = match_strdup(&args[0]);
1497                         if (!arg_p) {
1498                                 ret = -ENOMEM;
1499                                 goto out;
1500                         }
1501                         ret = strict_strtoull(arg_p, 0, &tmp_ll);
1502                         if (ret < 0) {
1503                                 pr_err("strict_strtoull() failed for"
1504                                         " sa_res_key=\n");
1505                                 goto out;
1506                         }
1507                         sa_res_key = (u64)tmp_ll;
1508                         break;
1509                 /*
1510                  * PR APTPL Metadata for Reservation
1511                  */
1512                 case Opt_res_holder:
1513                         match_int(args, &arg);
1514                         res_holder = arg;
1515                         break;
1516                 case Opt_res_type:
1517                         match_int(args, &arg);
1518                         type = (u8)arg;
1519                         break;
1520                 case Opt_res_scope:
1521                         match_int(args, &arg);
1522                         scope = (u8)arg;
1523                         break;
1524                 case Opt_res_all_tg_pt:
1525                         match_int(args, &arg);
1526                         all_tg_pt = (int)arg;
1527                         break;
1528                 case Opt_mapped_lun:
1529                         match_int(args, &arg);
1530                         mapped_lun = (u32)arg;
1531                         break;
1532                 /*
1533                  * PR APTPL Metadata for Target Port
1534                  */
1535                 case Opt_target_fabric:
1536                         t_fabric = match_strdup(&args[0]);
1537                         if (!t_fabric) {
1538                                 ret = -ENOMEM;
1539                                 goto out;
1540                         }
1541                         break;
1542                 case Opt_target_node:
1543                         t_port = match_strdup(&args[0]);
1544                         if (!t_port) {
1545                                 ret = -ENOMEM;
1546                                 goto out;
1547                         }
1548                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1549                                 pr_err("APTPL metadata target_node="
1550                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1551                                         PR_APTPL_MAX_TPORT_LEN);
1552                                 ret = -EINVAL;
1553                                 break;
1554                         }
1555                         break;
1556                 case Opt_tpgt:
1557                         match_int(args, &arg);
1558                         tpgt = (u16)arg;
1559                         break;
1560                 case Opt_port_rtpi:
1561                         match_int(args, &arg);
1562                         port_rpti = (u16)arg;
1563                         break;
1564                 case Opt_target_lun:
1565                         match_int(args, &arg);
1566                         target_lun = (u32)arg;
1567                         break;
1568                 default:
1569                         break;
1570                 }
1571         }
1572
1573         if (!i_port || !t_port || !sa_res_key) {
1574                 pr_err("Illegal parameters for APTPL registration\n");
1575                 ret = -EINVAL;
1576                 goto out;
1577         }
1578
1579         if (res_holder && !(type)) {
1580                 pr_err("Illegal PR type: 0x%02x for reservation"
1581                                 " holder\n", type);
1582                 ret = -EINVAL;
1583                 goto out;
1584         }
1585
1586         ret = core_scsi3_alloc_aptpl_registration(&su_dev->t10_pr, sa_res_key,
1587                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1588                         res_holder, all_tg_pt, type);
1589 out:
1590         kfree(i_fabric);
1591         kfree(i_port);
1592         kfree(isid);
1593         kfree(t_fabric);
1594         kfree(t_port);
1595         kfree(orig);
1596         return (ret == 0) ? count : ret;
1597 }
1598
1599 SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);
1600
1601 CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);
1602
1603 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1604         &target_core_dev_pr_res_holder.attr,
1605         &target_core_dev_pr_res_pr_all_tgt_pts.attr,
1606         &target_core_dev_pr_res_pr_generation.attr,
1607         &target_core_dev_pr_res_pr_holder_tg_port.attr,
1608         &target_core_dev_pr_res_pr_registered_i_pts.attr,
1609         &target_core_dev_pr_res_pr_type.attr,
1610         &target_core_dev_pr_res_type.attr,
1611         &target_core_dev_pr_res_aptpl_active.attr,
1612         &target_core_dev_pr_res_aptpl_metadata.attr,
1613         NULL,
1614 };
1615
1616 static struct configfs_item_operations target_core_dev_pr_ops = {
1617         .show_attribute         = target_core_dev_pr_attr_show,
1618         .store_attribute        = target_core_dev_pr_attr_store,
1619 };
1620
1621 static struct config_item_type target_core_dev_pr_cit = {
1622         .ct_item_ops            = &target_core_dev_pr_ops,
1623         .ct_attrs               = target_core_dev_pr_attrs,
1624         .ct_owner               = THIS_MODULE,
1625 };
1626
1627 /*  End functions for struct config_item_type target_core_dev_pr_cit */
1628
1629 /*  Start functions for struct config_item_type target_core_dev_cit */
1630
1631 static ssize_t target_core_show_dev_info(void *p, char *page)
1632 {
1633         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1634         struct se_hba *hba = se_dev->se_dev_hba;
1635         struct se_subsystem_api *t = hba->transport;
1636         int bl = 0;
1637         ssize_t read_bytes = 0;
1638
1639         if (!se_dev->se_dev_ptr)
1640                 return -ENODEV;
1641
1642         transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
1643         read_bytes += bl;
1644         read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
1645         return read_bytes;
1646 }
1647
1648 static struct target_core_configfs_attribute target_core_attr_dev_info = {
1649         .attr   = { .ca_owner = THIS_MODULE,
1650                     .ca_name = "info",
1651                     .ca_mode = S_IRUGO },
1652         .show   = target_core_show_dev_info,
1653         .store  = NULL,
1654 };
1655
1656 static ssize_t target_core_store_dev_control(
1657         void *p,
1658         const char *page,
1659         size_t count)
1660 {
1661         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1662         struct se_hba *hba = se_dev->se_dev_hba;
1663         struct se_subsystem_api *t = hba->transport;
1664
1665         if (!se_dev->se_dev_su_ptr) {
1666                 pr_err("Unable to locate struct se_subsystem_dev>se"
1667                                 "_dev_su_ptr\n");
1668                 return -EINVAL;
1669         }
1670
1671         return t->set_configfs_dev_params(hba, se_dev, page, count);
1672 }
1673
1674 static struct target_core_configfs_attribute target_core_attr_dev_control = {
1675         .attr   = { .ca_owner = THIS_MODULE,
1676                     .ca_name = "control",
1677                     .ca_mode = S_IWUSR },
1678         .show   = NULL,
1679         .store  = target_core_store_dev_control,
1680 };
1681
1682 static ssize_t target_core_show_dev_alias(void *p, char *page)
1683 {
1684         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1685
1686         if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
1687                 return 0;
1688
1689         return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_alias);
1690 }
1691
1692 static ssize_t target_core_store_dev_alias(
1693         void *p,
1694         const char *page,
1695         size_t count)
1696 {
1697         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1698         struct se_hba *hba = se_dev->se_dev_hba;
1699         ssize_t read_bytes;
1700
1701         if (count > (SE_DEV_ALIAS_LEN-1)) {
1702                 pr_err("alias count: %d exceeds"
1703                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1704                         SE_DEV_ALIAS_LEN-1);
1705                 return -EINVAL;
1706         }
1707
1708         se_dev->su_dev_flags |= SDF_USING_ALIAS;
1709         read_bytes = snprintf(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
1710                         "%s", page);
1711
1712         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1713                 config_item_name(&hba->hba_group.cg_item),
1714                 config_item_name(&se_dev->se_dev_group.cg_item),
1715                 se_dev->se_dev_alias);
1716
1717         return read_bytes;
1718 }
1719
1720 static struct target_core_configfs_attribute target_core_attr_dev_alias = {
1721         .attr   = { .ca_owner = THIS_MODULE,
1722                     .ca_name = "alias",
1723                     .ca_mode =  S_IRUGO | S_IWUSR },
1724         .show   = target_core_show_dev_alias,
1725         .store  = target_core_store_dev_alias,
1726 };
1727
1728 static ssize_t target_core_show_dev_udev_path(void *p, char *page)
1729 {
1730         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1731
1732         if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH))
1733                 return 0;
1734
1735         return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_udev_path);
1736 }
1737
1738 static ssize_t target_core_store_dev_udev_path(
1739         void *p,
1740         const char *page,
1741         size_t count)
1742 {
1743         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1744         struct se_hba *hba = se_dev->se_dev_hba;
1745         ssize_t read_bytes;
1746
1747         if (count > (SE_UDEV_PATH_LEN-1)) {
1748                 pr_err("udev_path count: %d exceeds"
1749                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1750                         SE_UDEV_PATH_LEN-1);
1751                 return -EINVAL;
1752         }
1753
1754         se_dev->su_dev_flags |= SDF_USING_UDEV_PATH;
1755         read_bytes = snprintf(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
1756                         "%s", page);
1757
1758         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1759                 config_item_name(&hba->hba_group.cg_item),
1760                 config_item_name(&se_dev->se_dev_group.cg_item),
1761                 se_dev->se_dev_udev_path);
1762
1763         return read_bytes;
1764 }
1765
1766 static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
1767         .attr   = { .ca_owner = THIS_MODULE,
1768                     .ca_name = "udev_path",
1769                     .ca_mode =  S_IRUGO | S_IWUSR },
1770         .show   = target_core_show_dev_udev_path,
1771         .store  = target_core_store_dev_udev_path,
1772 };
1773
1774 static ssize_t target_core_store_dev_enable(
1775         void *p,
1776         const char *page,
1777         size_t count)
1778 {
1779         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1780         struct se_device *dev;
1781         struct se_hba *hba = se_dev->se_dev_hba;
1782         struct se_subsystem_api *t = hba->transport;
1783         char *ptr;
1784
1785         ptr = strstr(page, "1");
1786         if (!ptr) {
1787                 pr_err("For dev_enable ops, only valid value"
1788                                 " is \"1\"\n");
1789                 return -EINVAL;
1790         }
1791         if (se_dev->se_dev_ptr) {
1792                 pr_err("se_dev->se_dev_ptr already set for storage"
1793                                 " object\n");
1794                 return -EEXIST;
1795         }
1796
1797         if (t->check_configfs_dev_params(hba, se_dev) < 0)
1798                 return -EINVAL;
1799
1800         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1801         if (IS_ERR(dev))
1802                 return PTR_ERR(dev);
1803         else if (!dev)
1804                 return -EINVAL;
1805
1806         se_dev->se_dev_ptr = dev;
1807         pr_debug("Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
1808                 " %p\n", se_dev->se_dev_ptr);
1809
1810         return count;
1811 }
1812
1813 static struct target_core_configfs_attribute target_core_attr_dev_enable = {
1814         .attr   = { .ca_owner = THIS_MODULE,
1815                     .ca_name = "enable",
1816                     .ca_mode = S_IWUSR },
1817         .show   = NULL,
1818         .store  = target_core_store_dev_enable,
1819 };
1820
1821 static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
1822 {
1823         struct se_device *dev;
1824         struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
1825         struct config_item *lu_ci;
1826         struct t10_alua_lu_gp *lu_gp;
1827         struct t10_alua_lu_gp_member *lu_gp_mem;
1828         ssize_t len = 0;
1829
1830         dev = su_dev->se_dev_ptr;
1831         if (!dev)
1832                 return -ENODEV;
1833
1834         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED)
1835                 return len;
1836
1837         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1838         if (!lu_gp_mem) {
1839                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1840                                 " pointer\n");
1841                 return -EINVAL;
1842         }
1843
1844         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1845         lu_gp = lu_gp_mem->lu_gp;
1846         if (lu_gp) {
1847                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1848                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1849                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1850         }
1851         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1852
1853         return len;
1854 }
1855
1856 static ssize_t target_core_store_alua_lu_gp(
1857         void *p,
1858         const char *page,
1859         size_t count)
1860 {
1861         struct se_device *dev;
1862         struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
1863         struct se_hba *hba = su_dev->se_dev_hba;
1864         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
1865         struct t10_alua_lu_gp_member *lu_gp_mem;
1866         unsigned char buf[LU_GROUP_NAME_BUF];
1867         int move = 0;
1868
1869         dev = su_dev->se_dev_ptr;
1870         if (!dev)
1871                 return -ENODEV;
1872
1873         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
1874                 pr_warn("SPC3_ALUA_EMULATED not enabled for %s/%s\n",
1875                         config_item_name(&hba->hba_group.cg_item),
1876                         config_item_name(&su_dev->se_dev_group.cg_item));
1877                 return -EINVAL;
1878         }
1879         if (count > LU_GROUP_NAME_BUF) {
1880                 pr_err("ALUA LU Group Alias too large!\n");
1881                 return -EINVAL;
1882         }
1883         memset(buf, 0, LU_GROUP_NAME_BUF);
1884         memcpy(buf, page, count);
1885         /*
1886          * Any ALUA logical unit alias besides "NULL" means we will be
1887          * making a new group association.
1888          */
1889         if (strcmp(strstrip(buf), "NULL")) {
1890                 /*
1891                  * core_alua_get_lu_gp_by_name() will increment reference to
1892                  * struct t10_alua_lu_gp.  This reference is released with
1893                  * core_alua_get_lu_gp_by_name below().
1894                  */
1895                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
1896                 if (!lu_gp_new)
1897                         return -ENODEV;
1898         }
1899         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1900         if (!lu_gp_mem) {
1901                 if (lu_gp_new)
1902                         core_alua_put_lu_gp_from_name(lu_gp_new);
1903                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1904                                 " pointer\n");
1905                 return -EINVAL;
1906         }
1907
1908         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1909         lu_gp = lu_gp_mem->lu_gp;
1910         if (lu_gp) {
1911                 /*
1912                  * Clearing an existing lu_gp association, and replacing
1913                  * with NULL
1914                  */
1915                 if (!lu_gp_new) {
1916                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
1917                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
1918                                 " %hu\n",
1919                                 config_item_name(&hba->hba_group.cg_item),
1920                                 config_item_name(&su_dev->se_dev_group.cg_item),
1921                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
1922                                 lu_gp->lu_gp_id);
1923
1924                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1925                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1926
1927                         return count;
1928                 }
1929                 /*
1930                  * Removing existing association of lu_gp_mem with lu_gp
1931                  */
1932                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1933                 move = 1;
1934         }
1935         /*
1936          * Associate lu_gp_mem with lu_gp_new.
1937          */
1938         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
1939         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1940
1941         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
1942                 " core/alua/lu_gps/%s, ID: %hu\n",
1943                 (move) ? "Moving" : "Adding",
1944                 config_item_name(&hba->hba_group.cg_item),
1945                 config_item_name(&su_dev->se_dev_group.cg_item),
1946                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
1947                 lu_gp_new->lu_gp_id);
1948
1949         core_alua_put_lu_gp_from_name(lu_gp_new);
1950         return count;
1951 }
1952
1953 static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
1954         .attr   = { .ca_owner = THIS_MODULE,
1955                     .ca_name = "alua_lu_gp",
1956                     .ca_mode = S_IRUGO | S_IWUSR },
1957         .show   = target_core_show_alua_lu_gp,
1958         .store  = target_core_store_alua_lu_gp,
1959 };
1960
1961 static struct configfs_attribute *lio_core_dev_attrs[] = {
1962         &target_core_attr_dev_info.attr,
1963         &target_core_attr_dev_control.attr,
1964         &target_core_attr_dev_alias.attr,
1965         &target_core_attr_dev_udev_path.attr,
1966         &target_core_attr_dev_enable.attr,
1967         &target_core_attr_dev_alua_lu_gp.attr,
1968         NULL,
1969 };
1970
1971 static void target_core_dev_release(struct config_item *item)
1972 {
1973         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
1974                                 struct se_subsystem_dev, se_dev_group);
1975         struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
1976         struct se_subsystem_api *t = hba->transport;
1977         struct config_group *dev_cg = &se_dev->se_dev_group;
1978
1979         kfree(dev_cg->default_groups);
1980         /*
1981          * This pointer will set when the storage is enabled with:
1982          *`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
1983          */
1984         if (se_dev->se_dev_ptr) {
1985                 pr_debug("Target_Core_ConfigFS: Calling se_free_"
1986                         "virtual_device() for se_dev_ptr: %p\n",
1987                         se_dev->se_dev_ptr);
1988
1989                 se_free_virtual_device(se_dev->se_dev_ptr, hba);
1990         } else {
1991                 /*
1992                  * Release struct se_subsystem_dev->se_dev_su_ptr..
1993                  */
1994                 pr_debug("Target_Core_ConfigFS: Calling t->free_"
1995                         "device() for se_dev_su_ptr: %p\n",
1996                         se_dev->se_dev_su_ptr);
1997
1998                 t->free_device(se_dev->se_dev_su_ptr);
1999         }
2000
2001         pr_debug("Target_Core_ConfigFS: Deallocating se_subsystem"
2002                         "_dev_t: %p\n", se_dev);
2003         kfree(se_dev);
2004 }
2005
2006 static ssize_t target_core_dev_show(struct config_item *item,
2007                                      struct configfs_attribute *attr,
2008                                      char *page)
2009 {
2010         struct se_subsystem_dev *se_dev = container_of(
2011                         to_config_group(item), struct se_subsystem_dev,
2012                         se_dev_group);
2013         struct target_core_configfs_attribute *tc_attr = container_of(
2014                         attr, struct target_core_configfs_attribute, attr);
2015
2016         if (!tc_attr->show)
2017                 return -EINVAL;
2018
2019         return tc_attr->show(se_dev, page);
2020 }
2021
2022 static ssize_t target_core_dev_store(struct config_item *item,
2023                                       struct configfs_attribute *attr,
2024                                       const char *page, size_t count)
2025 {
2026         struct se_subsystem_dev *se_dev = container_of(
2027                         to_config_group(item), struct se_subsystem_dev,
2028                         se_dev_group);
2029         struct target_core_configfs_attribute *tc_attr = container_of(
2030                         attr, struct target_core_configfs_attribute, attr);
2031
2032         if (!tc_attr->store)
2033                 return -EINVAL;
2034
2035         return tc_attr->store(se_dev, page, count);
2036 }
2037
2038 static struct configfs_item_operations target_core_dev_item_ops = {
2039         .release                = target_core_dev_release,
2040         .show_attribute         = target_core_dev_show,
2041         .store_attribute        = target_core_dev_store,
2042 };
2043
2044 static struct config_item_type target_core_dev_cit = {
2045         .ct_item_ops            = &target_core_dev_item_ops,
2046         .ct_attrs               = lio_core_dev_attrs,
2047         .ct_owner               = THIS_MODULE,
2048 };
2049
2050 /* End functions for struct config_item_type target_core_dev_cit */
2051
2052 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2053
2054 CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
2055 #define SE_DEV_ALUA_LU_ATTR(_name, _mode)                               \
2056 static struct target_core_alua_lu_gp_attribute                          \
2057                         target_core_alua_lu_gp_##_name =                \
2058         __CONFIGFS_EATTR(_name, _mode,                                  \
2059         target_core_alua_lu_gp_show_attr_##_name,                       \
2060         target_core_alua_lu_gp_store_attr_##_name);
2061
2062 #define SE_DEV_ALUA_LU_ATTR_RO(_name)                                   \
2063 static struct target_core_alua_lu_gp_attribute                          \
2064                         target_core_alua_lu_gp_##_name =                \
2065         __CONFIGFS_EATTR_RO(_name,                                      \
2066         target_core_alua_lu_gp_show_attr_##_name);
2067
2068 /*
2069  * lu_gp_id
2070  */
2071 static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
2072         struct t10_alua_lu_gp *lu_gp,
2073         char *page)
2074 {
2075         if (!lu_gp->lu_gp_valid_id)
2076                 return 0;
2077
2078         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2079 }
2080
2081 static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
2082         struct t10_alua_lu_gp *lu_gp,
2083         const char *page,
2084         size_t count)
2085 {
2086         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2087         unsigned long lu_gp_id;
2088         int ret;
2089
2090         ret = strict_strtoul(page, 0, &lu_gp_id);
2091         if (ret < 0) {
2092                 pr_err("strict_strtoul() returned %d for"
2093                         " lu_gp_id\n", ret);
2094                 return -EINVAL;
2095         }
2096         if (lu_gp_id > 0x0000ffff) {
2097                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2098                         " 0x0000ffff\n", lu_gp_id);
2099                 return -EINVAL;
2100         }
2101
2102         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2103         if (ret < 0)
2104                 return -EINVAL;
2105
2106         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2107                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2108                 config_item_name(&alua_lu_gp_cg->cg_item),
2109                 lu_gp->lu_gp_id);
2110
2111         return count;
2112 }
2113
2114 SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);
2115
2116 /*
2117  * members
2118  */
2119 static ssize_t target_core_alua_lu_gp_show_attr_members(
2120         struct t10_alua_lu_gp *lu_gp,
2121         char *page)
2122 {
2123         struct se_device *dev;
2124         struct se_hba *hba;
2125         struct se_subsystem_dev *su_dev;
2126         struct t10_alua_lu_gp_member *lu_gp_mem;
2127         ssize_t len = 0, cur_len;
2128         unsigned char buf[LU_GROUP_NAME_BUF];
2129
2130         memset(buf, 0, LU_GROUP_NAME_BUF);
2131
2132         spin_lock(&lu_gp->lu_gp_lock);
2133         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2134                 dev = lu_gp_mem->lu_gp_mem_dev;
2135                 su_dev = dev->se_sub_dev;
2136                 hba = su_dev->se_dev_hba;
2137
2138                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2139                         config_item_name(&hba->hba_group.cg_item),
2140                         config_item_name(&su_dev->se_dev_group.cg_item));
2141                 cur_len++; /* Extra byte for NULL terminator */
2142
2143                 if ((cur_len + len) > PAGE_SIZE) {
2144                         pr_warn("Ran out of lu_gp_show_attr"
2145                                 "_members buffer\n");
2146                         break;
2147                 }
2148                 memcpy(page+len, buf, cur_len);
2149                 len += cur_len;
2150         }
2151         spin_unlock(&lu_gp->lu_gp_lock);
2152
2153         return len;
2154 }
2155
2156 SE_DEV_ALUA_LU_ATTR_RO(members);
2157
2158 CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);
2159
2160 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2161         &target_core_alua_lu_gp_lu_gp_id.attr,
2162         &target_core_alua_lu_gp_members.attr,
2163         NULL,
2164 };
2165
2166 static void target_core_alua_lu_gp_release(struct config_item *item)
2167 {
2168         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2169                         struct t10_alua_lu_gp, lu_gp_group);
2170
2171         core_alua_free_lu_gp(lu_gp);
2172 }
2173
2174 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2175         .release                = target_core_alua_lu_gp_release,
2176         .show_attribute         = target_core_alua_lu_gp_attr_show,
2177         .store_attribute        = target_core_alua_lu_gp_attr_store,
2178 };
2179
2180 static struct config_item_type target_core_alua_lu_gp_cit = {
2181         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2182         .ct_attrs               = target_core_alua_lu_gp_attrs,
2183         .ct_owner               = THIS_MODULE,
2184 };
2185
2186 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2187
2188 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2189
2190 static struct config_group *target_core_alua_create_lu_gp(
2191         struct config_group *group,
2192         const char *name)
2193 {
2194         struct t10_alua_lu_gp *lu_gp;
2195         struct config_group *alua_lu_gp_cg = NULL;
2196         struct config_item *alua_lu_gp_ci = NULL;
2197
2198         lu_gp = core_alua_allocate_lu_gp(name, 0);
2199         if (IS_ERR(lu_gp))
2200                 return NULL;
2201
2202         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2203         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2204
2205         config_group_init_type_name(alua_lu_gp_cg, name,
2206                         &target_core_alua_lu_gp_cit);
2207
2208         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2209                 " Group: core/alua/lu_gps/%s\n",
2210                 config_item_name(alua_lu_gp_ci));
2211
2212         return alua_lu_gp_cg;
2213
2214 }
2215
2216 static void target_core_alua_drop_lu_gp(
2217         struct config_group *group,
2218         struct config_item *item)
2219 {
2220         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2221                         struct t10_alua_lu_gp, lu_gp_group);
2222
2223         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2224                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2225                 config_item_name(item), lu_gp->lu_gp_id);
2226         /*
2227          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2228          * -> target_core_alua_lu_gp_release()
2229          */
2230         config_item_put(item);
2231 }
2232
2233 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2234         .make_group             = &target_core_alua_create_lu_gp,
2235         .drop_item              = &target_core_alua_drop_lu_gp,
2236 };
2237
2238 static struct config_item_type target_core_alua_lu_gps_cit = {
2239         .ct_item_ops            = NULL,
2240         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2241         .ct_owner               = THIS_MODULE,
2242 };
2243
2244 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2245
2246 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2247
2248 CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
2249 #define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)                            \
2250 static struct target_core_alua_tg_pt_gp_attribute                       \
2251                         target_core_alua_tg_pt_gp_##_name =             \
2252         __CONFIGFS_EATTR(_name, _mode,                                  \
2253         target_core_alua_tg_pt_gp_show_attr_##_name,                    \
2254         target_core_alua_tg_pt_gp_store_attr_##_name);
2255
2256 #define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)                                \
2257 static struct target_core_alua_tg_pt_gp_attribute                       \
2258                         target_core_alua_tg_pt_gp_##_name =             \
2259         __CONFIGFS_EATTR_RO(_name,                                      \
2260         target_core_alua_tg_pt_gp_show_attr_##_name);
2261
2262 /*
2263  * alua_access_state
2264  */
2265 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
2266         struct t10_alua_tg_pt_gp *tg_pt_gp,
2267         char *page)
2268 {
2269         return sprintf(page, "%d\n",
2270                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
2271 }
2272
2273 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
2274         struct t10_alua_tg_pt_gp *tg_pt_gp,
2275         const char *page,
2276         size_t count)
2277 {
2278         struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
2279         unsigned long tmp;
2280         int new_state, ret;
2281
2282         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2283                 pr_err("Unable to do implict ALUA on non valid"
2284                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2285                 return -EINVAL;
2286         }
2287
2288         ret = strict_strtoul(page, 0, &tmp);
2289         if (ret < 0) {
2290                 pr_err("Unable to extract new ALUA access state from"
2291                                 " %s\n", page);
2292                 return -EINVAL;
2293         }
2294         new_state = (int)tmp;
2295
2296         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) {
2297                 pr_err("Unable to process implict configfs ALUA"
2298                         " transition while TPGS_IMPLICT_ALUA is diabled\n");
2299                 return -EINVAL;
2300         }
2301
2302         ret = core_alua_do_port_transition(tg_pt_gp, su_dev->se_dev_ptr,
2303                                         NULL, NULL, new_state, 0);
2304         return (!ret) ? count : -EINVAL;
2305 }
2306
2307 SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);
2308
2309 /*
2310  * alua_access_status
2311  */
2312 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
2313         struct t10_alua_tg_pt_gp *tg_pt_gp,
2314         char *page)
2315 {
2316         return sprintf(page, "%s\n",
2317                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2318 }
2319
2320 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
2321         struct t10_alua_tg_pt_gp *tg_pt_gp,
2322         const char *page,
2323         size_t count)
2324 {
2325         unsigned long tmp;
2326         int new_status, ret;
2327
2328         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2329                 pr_err("Unable to do set ALUA access status on non"
2330                         " valid tg_pt_gp ID: %hu\n",
2331                         tg_pt_gp->tg_pt_gp_valid_id);
2332                 return -EINVAL;
2333         }
2334
2335         ret = strict_strtoul(page, 0, &tmp);
2336         if (ret < 0) {
2337                 pr_err("Unable to extract new ALUA access status"
2338                                 " from %s\n", page);
2339                 return -EINVAL;
2340         }
2341         new_status = (int)tmp;
2342
2343         if ((new_status != ALUA_STATUS_NONE) &&
2344             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
2345             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
2346                 pr_err("Illegal ALUA access status: 0x%02x\n",
2347                                 new_status);
2348                 return -EINVAL;
2349         }
2350
2351         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2352         return count;
2353 }
2354
2355 SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);
2356
2357 /*
2358  * alua_access_type
2359  */
2360 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
2361         struct t10_alua_tg_pt_gp *tg_pt_gp,
2362         char *page)
2363 {
2364         return core_alua_show_access_type(tg_pt_gp, page);
2365 }
2366
2367 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
2368         struct t10_alua_tg_pt_gp *tg_pt_gp,
2369         const char *page,
2370         size_t count)
2371 {
2372         return core_alua_store_access_type(tg_pt_gp, page, count);
2373 }
2374
2375 SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);
2376
2377 /*
2378  * alua_write_metadata
2379  */
2380 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
2381         struct t10_alua_tg_pt_gp *tg_pt_gp,
2382         char *page)
2383 {
2384         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
2385 }
2386
2387 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
2388         struct t10_alua_tg_pt_gp *tg_pt_gp,
2389         const char *page,
2390         size_t count)
2391 {
2392         unsigned long tmp;
2393         int ret;
2394
2395         ret = strict_strtoul(page, 0, &tmp);
2396         if (ret < 0) {
2397                 pr_err("Unable to extract alua_write_metadata\n");
2398                 return -EINVAL;
2399         }
2400
2401         if ((tmp != 0) && (tmp != 1)) {
2402                 pr_err("Illegal value for alua_write_metadata:"
2403                         " %lu\n", tmp);
2404                 return -EINVAL;
2405         }
2406         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2407
2408         return count;
2409 }
2410
2411 SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);
2412
2413
2414
2415 /*
2416  * nonop_delay_msecs
2417  */
2418 static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
2419         struct t10_alua_tg_pt_gp *tg_pt_gp,
2420         char *page)
2421 {
2422         return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);
2423
2424 }
2425
2426 static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
2427         struct t10_alua_tg_pt_gp *tg_pt_gp,
2428         const char *page,
2429         size_t count)
2430 {
2431         return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
2432 }
2433
2434 SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);
2435
2436 /*
2437  * trans_delay_msecs
2438  */
2439 static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
2440         struct t10_alua_tg_pt_gp *tg_pt_gp,
2441         char *page)
2442 {
2443         return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
2444 }
2445
2446 static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
2447         struct t10_alua_tg_pt_gp *tg_pt_gp,
2448         const char *page,
2449         size_t count)
2450 {
2451         return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
2452 }
2453
2454 SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);
2455
2456 /*
2457  * preferred
2458  */
2459
2460 static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
2461         struct t10_alua_tg_pt_gp *tg_pt_gp,
2462         char *page)
2463 {
2464         return core_alua_show_preferred_bit(tg_pt_gp, page);
2465 }
2466
2467 static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
2468         struct t10_alua_tg_pt_gp *tg_pt_gp,
2469         const char *page,
2470         size_t count)
2471 {
2472         return core_alua_store_preferred_bit(tg_pt_gp, page, count);
2473 }
2474
2475 SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);
2476
2477 /*
2478  * tg_pt_gp_id
2479  */
2480 static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
2481         struct t10_alua_tg_pt_gp *tg_pt_gp,
2482         char *page)
2483 {
2484         if (!tg_pt_gp->tg_pt_gp_valid_id)
2485                 return 0;
2486
2487         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2488 }
2489
2490 static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
2491         struct t10_alua_tg_pt_gp *tg_pt_gp,
2492         const char *page,
2493         size_t count)
2494 {
2495         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2496         unsigned long tg_pt_gp_id;
2497         int ret;
2498
2499         ret = strict_strtoul(page, 0, &tg_pt_gp_id);
2500         if (ret < 0) {
2501                 pr_err("strict_strtoul() returned %d for"
2502                         " tg_pt_gp_id\n", ret);
2503                 return -EINVAL;
2504         }
2505         if (tg_pt_gp_id > 0x0000ffff) {
2506                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
2507                         " 0x0000ffff\n", tg_pt_gp_id);
2508                 return -EINVAL;
2509         }
2510
2511         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2512         if (ret < 0)
2513                 return -EINVAL;
2514
2515         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2516                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2517                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2518                 tg_pt_gp->tg_pt_gp_id);
2519
2520         return count;
2521 }
2522
2523 SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);
2524
2525 /*
2526  * members
2527  */
2528 static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
2529         struct t10_alua_tg_pt_gp *tg_pt_gp,
2530         char *page)
2531 {
2532         struct se_port *port;
2533         struct se_portal_group *tpg;
2534         struct se_lun *lun;
2535         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2536         ssize_t len = 0, cur_len;
2537         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2538
2539         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2540
2541         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2542         list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
2543                         tg_pt_gp_mem_list) {
2544                 port = tg_pt_gp_mem->tg_pt;
2545                 tpg = port->sep_tpg;
2546                 lun = port->sep_lun;
2547
2548                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2549                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2550                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2551                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2552                         config_item_name(&lun->lun_group.cg_item));
2553                 cur_len++; /* Extra byte for NULL terminator */
2554
2555                 if ((cur_len + len) > PAGE_SIZE) {
2556                         pr_warn("Ran out of lu_gp_show_attr"
2557                                 "_members buffer\n");
2558                         break;
2559                 }
2560                 memcpy(page+len, buf, cur_len);
2561                 len += cur_len;
2562         }
2563         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2564
2565         return len;
2566 }
2567
2568 SE_DEV_ALUA_TG_PT_ATTR_RO(members);
2569
2570 CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
2571                         tg_pt_gp_group);
2572
2573 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2574         &target_core_alua_tg_pt_gp_alua_access_state.attr,
2575         &target_core_alua_tg_pt_gp_alua_access_status.attr,
2576         &target_core_alua_tg_pt_gp_alua_access_type.attr,
2577         &target_core_alua_tg_pt_gp_alua_write_metadata.attr,
2578         &target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
2579         &target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
2580         &target_core_alua_tg_pt_gp_preferred.attr,
2581         &target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
2582         &target_core_alua_tg_pt_gp_members.attr,
2583         NULL,
2584 };
2585
2586 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2587 {
2588         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2589                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2590
2591         core_alua_free_tg_pt_gp(tg_pt_gp);
2592 }
2593
2594 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2595         .release                = target_core_alua_tg_pt_gp_release,
2596         .show_attribute         = target_core_alua_tg_pt_gp_attr_show,
2597         .store_attribute        = target_core_alua_tg_pt_gp_attr_store,
2598 };
2599
2600 static struct config_item_type target_core_alua_tg_pt_gp_cit = {
2601         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2602         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2603         .ct_owner               = THIS_MODULE,
2604 };
2605
2606 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2607
2608 /* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2609
2610 static struct config_group *target_core_alua_create_tg_pt_gp(
2611         struct config_group *group,
2612         const char *name)
2613 {
2614         struct t10_alua *alua = container_of(group, struct t10_alua,
2615                                         alua_tg_pt_gps_group);
2616         struct t10_alua_tg_pt_gp *tg_pt_gp;
2617         struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
2618         struct config_group *alua_tg_pt_gp_cg = NULL;
2619         struct config_item *alua_tg_pt_gp_ci = NULL;
2620
2621         tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
2622         if (!tg_pt_gp)
2623                 return NULL;
2624
2625         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2626         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2627
2628         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2629                         &target_core_alua_tg_pt_gp_cit);
2630
2631         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2632                 " Group: alua/tg_pt_gps/%s\n",
2633                 config_item_name(alua_tg_pt_gp_ci));
2634
2635         return alua_tg_pt_gp_cg;
2636 }
2637
2638 static void target_core_alua_drop_tg_pt_gp(
2639         struct config_group *group,
2640         struct config_item *item)
2641 {
2642         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2643                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2644
2645         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2646                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2647                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2648         /*
2649          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2650          * -> target_core_alua_tg_pt_gp_release().
2651          */
2652         config_item_put(item);
2653 }
2654
2655 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2656         .make_group             = &target_core_alua_create_tg_pt_gp,
2657         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2658 };
2659
2660 static struct config_item_type target_core_alua_tg_pt_gps_cit = {
2661         .ct_group_ops           = &target_core_alua_tg_pt_gps_group_ops,
2662         .ct_owner               = THIS_MODULE,
2663 };
2664
2665 /* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2666
2667 /* Start functions for struct config_item_type target_core_alua_cit */
2668
2669 /*
2670  * target_core_alua_cit is a ConfigFS group that lives under
2671  * /sys/kernel/config/target/core/alua.  There are default groups
2672  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2673  * target_core_alua_cit in target_core_init_configfs() below.
2674  */
2675 static struct config_item_type target_core_alua_cit = {
2676         .ct_item_ops            = NULL,
2677         .ct_attrs               = NULL,
2678         .ct_owner               = THIS_MODULE,
2679 };
2680
2681 /* End functions for struct config_item_type target_core_alua_cit */
2682
2683 /* Start functions for struct config_item_type target_core_stat_cit */
2684
2685 static struct config_group *target_core_stat_mkdir(
2686         struct config_group *group,
2687         const char *name)
2688 {
2689         return ERR_PTR(-ENOSYS);
2690 }
2691
2692 static void target_core_stat_rmdir(
2693         struct config_group *group,
2694         struct config_item *item)
2695 {
2696         return;
2697 }
2698
2699 static struct configfs_group_operations target_core_stat_group_ops = {
2700         .make_group             = &target_core_stat_mkdir,
2701         .drop_item              = &target_core_stat_rmdir,
2702 };
2703
2704 static struct config_item_type target_core_stat_cit = {
2705         .ct_group_ops           = &target_core_stat_group_ops,
2706         .ct_owner               = THIS_MODULE,
2707 };
2708
2709 /* End functions for struct config_item_type target_core_stat_cit */
2710
2711 /* Start functions for struct config_item_type target_core_hba_cit */
2712
2713 static struct config_group *target_core_make_subdev(
2714         struct config_group *group,
2715         const char *name)
2716 {
2717         struct t10_alua_tg_pt_gp *tg_pt_gp;
2718         struct se_subsystem_dev *se_dev;
2719         struct se_subsystem_api *t;
2720         struct config_item *hba_ci = &group->cg_item;
2721         struct se_hba *hba = item_to_hba(hba_ci);
2722         struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
2723         struct config_group *dev_stat_grp = NULL;
2724         int errno = -ENOMEM, ret;
2725
2726         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2727         if (ret)
2728                 return ERR_PTR(ret);
2729         /*
2730          * Locate the struct se_subsystem_api from parent's struct se_hba.
2731          */
2732         t = hba->transport;
2733
2734         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
2735         if (!se_dev) {
2736                 pr_err("Unable to allocate memory for"
2737                                 " struct se_subsystem_dev\n");
2738                 goto unlock;
2739         }
2740         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
2741         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
2742         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
2743         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
2744         spin_lock_init(&se_dev->t10_pr.registration_lock);
2745         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
2746         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
2747         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
2748         spin_lock_init(&se_dev->se_dev_lock);
2749         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
2750         se_dev->t10_wwn.t10_sub_dev = se_dev;
2751         se_dev->t10_alua.t10_sub_dev = se_dev;
2752         se_dev->se_dev_attrib.da_sub_dev = se_dev;
2753
2754         se_dev->se_dev_hba = hba;
2755         dev_cg = &se_dev->se_dev_group;
2756
2757         dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 7,
2758                         GFP_KERNEL);
2759         if (!dev_cg->default_groups)
2760                 goto out;
2761         /*
2762          * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
2763          * for ->allocate_virtdevice()
2764          *
2765          * se_dev->se_dev_ptr will be set after ->create_virtdev()
2766          * has been called successfully in the next level up in the
2767          * configfs tree for device object's struct config_group.
2768          */
2769         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
2770         if (!se_dev->se_dev_su_ptr) {
2771                 pr_err("Unable to locate subsystem dependent pointer"
2772                         " from allocate_virtdevice()\n");
2773                 goto out;
2774         }
2775
2776         config_group_init_type_name(&se_dev->se_dev_group, name,
2777                         &target_core_dev_cit);
2778         config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
2779                         &target_core_dev_attrib_cit);
2780         config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
2781                         &target_core_dev_pr_cit);
2782         config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
2783                         &target_core_dev_wwn_cit);
2784         config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
2785                         "alua", &target_core_alua_tg_pt_gps_cit);
2786         config_group_init_type_name(&se_dev->dev_stat_grps.stat_group,
2787                         "statistics", &target_core_stat_cit);
2788
2789         dev_cg->default_groups[0] = &se_dev->se_dev_attrib.da_group;
2790         dev_cg->default_groups[1] = &se_dev->se_dev_pr_group;
2791         dev_cg->default_groups[2] = &se_dev->t10_wwn.t10_wwn_group;
2792         dev_cg->default_groups[3] = &se_dev->t10_alua.alua_tg_pt_gps_group;
2793         dev_cg->default_groups[4] = &se_dev->dev_stat_grps.stat_group;
2794         dev_cg->default_groups[5] = NULL;
2795         /*
2796          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2797          */
2798         tg_pt_gp = core_alua_allocate_tg_pt_gp(se_dev, "default_tg_pt_gp", 1);
2799         if (!tg_pt_gp)
2800                 goto out;
2801
2802         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2803         tg_pt_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
2804                                 GFP_KERNEL);
2805         if (!tg_pt_gp_cg->default_groups) {
2806                 pr_err("Unable to allocate tg_pt_gp_cg->"
2807                                 "default_groups\n");
2808                 goto out;
2809         }
2810
2811         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2812                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2813         tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
2814         tg_pt_gp_cg->default_groups[1] = NULL;
2815         se_dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2816         /*
2817          * Add core/$HBA/$DEV/statistics/ default groups
2818          */
2819         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2820         dev_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 4,
2821                                 GFP_KERNEL);
2822         if (!dev_stat_grp->default_groups) {
2823                 pr_err("Unable to allocate dev_stat_grp->default_groups\n");
2824                 goto out;
2825         }
2826         target_stat_setup_dev_default_groups(se_dev);
2827
2828         pr_debug("Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
2829                 " %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);
2830
2831         mutex_unlock(&hba->hba_access_mutex);
2832         return &se_dev->se_dev_group;
2833 out:
2834         if (se_dev->t10_alua.default_tg_pt_gp) {
2835                 core_alua_free_tg_pt_gp(se_dev->t10_alua.default_tg_pt_gp);
2836                 se_dev->t10_alua.default_tg_pt_gp = NULL;
2837         }
2838         if (dev_stat_grp)
2839                 kfree(dev_stat_grp->default_groups);
2840         if (tg_pt_gp_cg)
2841                 kfree(tg_pt_gp_cg->default_groups);
2842         if (dev_cg)
2843                 kfree(dev_cg->default_groups);
2844         if (se_dev->se_dev_su_ptr)
2845                 t->free_device(se_dev->se_dev_su_ptr);
2846         kfree(se_dev);
2847 unlock:
2848         mutex_unlock(&hba->hba_access_mutex);
2849         return ERR_PTR(errno);
2850 }
2851
2852 static void target_core_drop_subdev(
2853         struct config_group *group,
2854         struct config_item *item)
2855 {
2856         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
2857                                 struct se_subsystem_dev, se_dev_group);
2858         struct se_hba *hba;
2859         struct se_subsystem_api *t;
2860         struct config_item *df_item;
2861         struct config_group *dev_cg, *tg_pt_gp_cg, *dev_stat_grp;
2862         int i;
2863
2864         hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
2865
2866         mutex_lock(&hba->hba_access_mutex);
2867         t = hba->transport;
2868
2869         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2870         for (i = 0; dev_stat_grp->default_groups[i]; i++) {
2871                 df_item = &dev_stat_grp->default_groups[i]->cg_item;
2872                 dev_stat_grp->default_groups[i] = NULL;
2873                 config_item_put(df_item);
2874         }
2875         kfree(dev_stat_grp->default_groups);
2876
2877         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2878         for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
2879                 df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
2880                 tg_pt_gp_cg->default_groups[i] = NULL;
2881                 config_item_put(df_item);
2882         }
2883         kfree(tg_pt_gp_cg->default_groups);
2884         /*
2885          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
2886          * directly from target_core_alua_tg_pt_gp_release().
2887          */
2888         se_dev->t10_alua.default_tg_pt_gp = NULL;
2889
2890         dev_cg = &se_dev->se_dev_group;
2891         for (i = 0; dev_cg->default_groups[i]; i++) {
2892                 df_item = &dev_cg->default_groups[i]->cg_item;
2893                 dev_cg->default_groups[i] = NULL;
2894                 config_item_put(df_item);
2895         }
2896         /*
2897          * The releasing of se_dev and associated se_dev->se_dev_ptr is done
2898          * from target_core_dev_item_ops->release() ->target_core_dev_release().
2899          */
2900         config_item_put(item);
2901         mutex_unlock(&hba->hba_access_mutex);
2902 }
2903
2904 static struct configfs_group_operations target_core_hba_group_ops = {
2905         .make_group             = target_core_make_subdev,
2906         .drop_item              = target_core_drop_subdev,
2907 };
2908
2909 CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
2910 #define SE_HBA_ATTR(_name, _mode)                               \
2911 static struct target_core_hba_attribute                         \
2912                 target_core_hba_##_name =                       \
2913                 __CONFIGFS_EATTR(_name, _mode,                  \
2914                 target_core_hba_show_attr_##_name,              \
2915                 target_core_hba_store_attr_##_name);
2916
2917 #define SE_HBA_ATTR_RO(_name)                                   \
2918 static struct target_core_hba_attribute                         \
2919                 target_core_hba_##_name =                       \
2920                 __CONFIGFS_EATTR_RO(_name,                      \
2921                 target_core_hba_show_attr_##_name);
2922
2923 static ssize_t target_core_hba_show_attr_hba_info(
2924         struct se_hba *hba,
2925         char *page)
2926 {
2927         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
2928                         hba->hba_id, hba->transport->name,
2929                         TARGET_CORE_CONFIGFS_VERSION);
2930 }
2931
2932 SE_HBA_ATTR_RO(hba_info);
2933
2934 static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
2935                                 char *page)
2936 {
2937         int hba_mode = 0;
2938
2939         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
2940                 hba_mode = 1;
2941
2942         return sprintf(page, "%d\n", hba_mode);
2943 }
2944
2945 static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
2946                                 const char *page, size_t count)
2947 {
2948         struct se_subsystem_api *transport = hba->transport;
2949         unsigned long mode_flag;
2950         int ret;
2951
2952         if (transport->pmode_enable_hba == NULL)
2953                 return -EINVAL;
2954
2955         ret = strict_strtoul(page, 0, &mode_flag);
2956         if (ret < 0) {
2957                 pr_err("Unable to extract hba mode flag: %d\n", ret);
2958                 return -EINVAL;
2959         }
2960
2961         spin_lock(&hba->device_lock);
2962         if (!list_empty(&hba->hba_dev_list)) {
2963                 pr_err("Unable to set hba_mode with active devices\n");
2964                 spin_unlock(&hba->device_lock);
2965                 return -EINVAL;
2966         }
2967         spin_unlock(&hba->device_lock);
2968
2969         ret = transport->pmode_enable_hba(hba, mode_flag);
2970         if (ret < 0)
2971                 return -EINVAL;
2972         if (ret > 0)
2973                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
2974         else if (ret == 0)
2975                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
2976
2977         return count;
2978 }
2979
2980 SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
2981
2982 CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
2983
2984 static void target_core_hba_release(struct config_item *item)
2985 {
2986         struct se_hba *hba = container_of(to_config_group(item),
2987                                 struct se_hba, hba_group);
2988         core_delete_hba(hba);
2989 }
2990
2991 static struct configfs_attribute *target_core_hba_attrs[] = {
2992         &target_core_hba_hba_info.attr,
2993         &target_core_hba_hba_mode.attr,
2994         NULL,
2995 };
2996
2997 static struct configfs_item_operations target_core_hba_item_ops = {
2998         .release                = target_core_hba_release,
2999         .show_attribute         = target_core_hba_attr_show,
3000         .store_attribute        = target_core_hba_attr_store,
3001 };
3002
3003 static struct config_item_type target_core_hba_cit = {
3004         .ct_item_ops            = &target_core_hba_item_ops,
3005         .ct_group_ops           = &target_core_hba_group_ops,
3006         .ct_attrs               = target_core_hba_attrs,
3007         .ct_owner               = THIS_MODULE,
3008 };
3009
3010 static struct config_group *target_core_call_addhbatotarget(
3011         struct config_group *group,
3012         const char *name)
3013 {
3014         char *se_plugin_str, *str, *str2;
3015         struct se_hba *hba;
3016         char buf[TARGET_CORE_NAME_MAX_LEN];
3017         unsigned long plugin_dep_id = 0;
3018         int ret;
3019
3020         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3021         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3022                 pr_err("Passed *name strlen(): %d exceeds"
3023                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3024                         TARGET_CORE_NAME_MAX_LEN);
3025                 return ERR_PTR(-ENAMETOOLONG);
3026         }
3027         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3028
3029         str = strstr(buf, "_");
3030         if (!str) {
3031                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3032                 return ERR_PTR(-EINVAL);
3033         }
3034         se_plugin_str = buf;
3035         /*
3036          * Special case for subsystem plugins that have "_" in their names.
3037          * Namely rd_direct and rd_mcp..
3038          */
3039         str2 = strstr(str+1, "_");
3040         if (str2) {
3041                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3042                 str2++; /* Skip to start of plugin dependent ID */
3043                 str = str2;
3044         } else {
3045                 *str = '\0'; /* Terminate for *se_plugin_str */
3046                 str++; /* Skip to start of plugin dependent ID */
3047         }
3048
3049         ret = strict_strtoul(str, 0, &plugin_dep_id);
3050         if (ret < 0) {
3051                 pr_err("strict_strtoul() returned %d for"
3052                                 " plugin_dep_id\n", ret);
3053                 return ERR_PTR(-EINVAL);
3054         }
3055         /*
3056          * Load up TCM subsystem plugins if they have not already been loaded.
3057          */
3058         transport_subsystem_check_init();
3059
3060         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3061         if (IS_ERR(hba))
3062                 return ERR_CAST(hba);
3063
3064         config_group_init_type_name(&hba->hba_group, name,
3065                         &target_core_hba_cit);
3066
3067         return &hba->hba_group;
3068 }
3069
3070 static void target_core_call_delhbafromtarget(
3071         struct config_group *group,
3072         struct config_item *item)
3073 {
3074         /*
3075          * core_delete_hba() is called from target_core_hba_item_ops->release()
3076          * -> target_core_hba_release()
3077          */
3078         config_item_put(item);
3079 }
3080
3081 static struct configfs_group_operations target_core_group_ops = {
3082         .make_group     = target_core_call_addhbatotarget,
3083         .drop_item      = target_core_call_delhbafromtarget,
3084 };
3085
3086 static struct config_item_type target_core_cit = {
3087         .ct_item_ops    = NULL,
3088         .ct_group_ops   = &target_core_group_ops,
3089         .ct_attrs       = NULL,
3090         .ct_owner       = THIS_MODULE,
3091 };
3092
3093 /* Stop functions for struct config_item_type target_core_hba_cit */
3094
3095 static int __init target_core_init_configfs(void)
3096 {
3097         struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
3098         struct config_group *lu_gp_cg = NULL;
3099         struct configfs_subsystem *subsys;
3100         struct t10_alua_lu_gp *lu_gp;
3101         int ret;
3102
3103         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3104                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3105                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3106
3107         subsys = target_core_subsystem[0];
3108         config_group_init(&subsys->su_group);
3109         mutex_init(&subsys->su_mutex);
3110
3111         INIT_LIST_HEAD(&g_tf_list);
3112         mutex_init(&g_tf_lock);
3113         ret = init_se_kmem_caches();
3114         if (ret < 0)
3115                 return ret;
3116         /*
3117          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3118          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3119          */
3120         target_cg = &subsys->su_group;
3121         target_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3122                                 GFP_KERNEL);
3123         if (!target_cg->default_groups) {
3124                 pr_err("Unable to allocate target_cg->default_groups\n");
3125                 goto out_global;
3126         }
3127
3128         config_group_init_type_name(&target_core_hbagroup,
3129                         "core", &target_core_cit);
3130         target_cg->default_groups[0] = &target_core_hbagroup;
3131         target_cg->default_groups[1] = NULL;
3132         /*
3133          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3134          */
3135         hba_cg = &target_core_hbagroup;
3136         hba_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3137                                 GFP_KERNEL);
3138         if (!hba_cg->default_groups) {
3139                 pr_err("Unable to allocate hba_cg->default_groups\n");
3140                 goto out_global;
3141         }
3142         config_group_init_type_name(&alua_group,
3143                         "alua", &target_core_alua_cit);
3144         hba_cg->default_groups[0] = &alua_group;
3145         hba_cg->default_groups[1] = NULL;
3146         /*
3147          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3148          * groups under /sys/kernel/config/target/core/alua/
3149          */
3150         alua_cg = &alua_group;
3151         alua_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3152                         GFP_KERNEL);
3153         if (!alua_cg->default_groups) {
3154                 pr_err("Unable to allocate alua_cg->default_groups\n");
3155                 goto out_global;
3156         }
3157
3158         config_group_init_type_name(&alua_lu_gps_group,
3159                         "lu_gps", &target_core_alua_lu_gps_cit);
3160         alua_cg->default_groups[0] = &alua_lu_gps_group;
3161         alua_cg->default_groups[1] = NULL;
3162         /*
3163          * Add core/alua/lu_gps/default_lu_gp
3164          */
3165         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3166         if (IS_ERR(lu_gp))
3167                 goto out_global;
3168
3169         lu_gp_cg = &alua_lu_gps_group;
3170         lu_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3171                         GFP_KERNEL);
3172         if (!lu_gp_cg->default_groups) {
3173                 pr_err("Unable to allocate lu_gp_cg->default_groups\n");
3174                 goto out_global;
3175         }
3176
3177         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3178                                 &target_core_alua_lu_gp_cit);
3179         lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
3180         lu_gp_cg->default_groups[1] = NULL;
3181         default_lu_gp = lu_gp;
3182         /*
3183          * Register the target_core_mod subsystem with configfs.
3184          */
3185         ret = configfs_register_subsystem(subsys);
3186         if (ret < 0) {
3187                 pr_err("Error %d while registering subsystem %s\n",
3188                         ret, subsys->su_group.cg_item.ci_namebuf);
3189                 goto out_global;
3190         }
3191         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3192                 " Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
3193                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3194         /*
3195          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3196          */
3197         ret = rd_module_init();
3198         if (ret < 0)
3199                 goto out;
3200
3201         if (core_dev_setup_virtual_lun0() < 0)
3202                 goto out;
3203
3204         return 0;
3205
3206 out:
3207         configfs_unregister_subsystem(subsys);
3208         core_dev_release_virtual_lun0();
3209         rd_module_exit();
3210 out_global:
3211         if (default_lu_gp) {
3212                 core_alua_free_lu_gp(default_lu_gp);
3213                 default_lu_gp = NULL;
3214         }
3215         if (lu_gp_cg)
3216                 kfree(lu_gp_cg->default_groups);
3217         if (alua_cg)
3218                 kfree(alua_cg->default_groups);
3219         if (hba_cg)
3220                 kfree(hba_cg->default_groups);
3221         kfree(target_cg->default_groups);
3222         release_se_kmem_caches();
3223         return ret;
3224 }
3225
3226 static void __exit target_core_exit_configfs(void)
3227 {
3228         struct configfs_subsystem *subsys;
3229         struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
3230         struct config_item *item;
3231         int i;
3232
3233         subsys = target_core_subsystem[0];
3234
3235         lu_gp_cg = &alua_lu_gps_group;
3236         for (i = 0; lu_gp_cg->default_groups[i]; i++) {
3237                 item = &lu_gp_cg->default_groups[i]->cg_item;
3238                 lu_gp_cg->default_groups[i] = NULL;
3239                 config_item_put(item);
3240         }
3241         kfree(lu_gp_cg->default_groups);
3242         lu_gp_cg->default_groups = NULL;
3243
3244         alua_cg = &alua_group;
3245         for (i = 0; alua_cg->default_groups[i]; i++) {
3246                 item = &alua_cg->default_groups[i]->cg_item;
3247                 alua_cg->default_groups[i] = NULL;
3248                 config_item_put(item);
3249         }
3250         kfree(alua_cg->default_groups);
3251         alua_cg->default_groups = NULL;
3252
3253         hba_cg = &target_core_hbagroup;
3254         for (i = 0; hba_cg->default_groups[i]; i++) {
3255                 item = &hba_cg->default_groups[i]->cg_item;
3256                 hba_cg->default_groups[i] = NULL;
3257                 config_item_put(item);
3258         }
3259         kfree(hba_cg->default_groups);
3260         hba_cg->default_groups = NULL;
3261         /*
3262          * We expect subsys->su_group.default_groups to be released
3263          * by configfs subsystem provider logic..
3264          */
3265         configfs_unregister_subsystem(subsys);
3266         kfree(subsys->su_group.default_groups);
3267
3268         core_alua_free_lu_gp(default_lu_gp);
3269         default_lu_gp = NULL;
3270
3271         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3272                         " Infrastructure\n");
3273
3274         core_dev_release_virtual_lun0();
3275         rd_module_exit();
3276         release_se_kmem_caches();
3277 }
3278
3279 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3280 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3281 MODULE_LICENSE("GPL");
3282
3283 module_init(target_core_init_configfs);
3284 module_exit(target_core_exit_configfs);