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  * (c) Copyright 2008-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  ****************************************************************************/
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <generated/utsrelease.h>
  26 #include <linux/utsname.h>
  27 #include <linux/init.h>
  28 #include <linux/fs.h>
  29 #include <linux/namei.h>
  30 #include <linux/slab.h>
  31 #include <linux/types.h>
  32 #include <linux/delay.h>
  33 #include <linux/unistd.h>
  34 #include <linux/string.h>
  35 #include <linux/parser.h>
  36 #include <linux/syscalls.h>
  37 #include <linux/configfs.h>
  38 #include <linux/spinlock.h>
  39
  40 #include <target/target_core_base.h>
  41 #include <target/target_core_backend.h>
  42 #include <target/target_core_fabric.h>
  43
  44 #include "target_core_internal.h"
  45 #include "target_core_alua.h"
  46 #include "target_core_pr.h"
  47 #include "target_core_rd.h"
  48 #include "target_core_xcopy.h"
  49
  50 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
  51 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  52 {                                                                       \
  53         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  54                                                                         \
  55         cit->ct_item_ops = _item_ops;                                   \
  56         cit->ct_group_ops = _group_ops;                                 \
  57         cit->ct_attrs = _attrs;                                         \
  58         cit->ct_owner = tb->ops->owner;                                 \
  59         pr_debug("Setup generic %s\n", __stringify(_name));             \
  60 }
  61
  62 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)                  \
  63 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  64 {                                                                       \
  65         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  66                                                                         \
  67         cit->ct_item_ops = _item_ops;                                   \
  68         cit->ct_group_ops = _group_ops;                                 \
  69         cit->ct_attrs = tb->ops->tb_##_name##_attrs;                    \
  70         cit->ct_owner = tb->ops->owner;                                 \
  71         pr_debug("Setup generic %s\n", __stringify(_name));             \
  72 }
  73
  74 extern struct t10_alua_lu_gp *default_lu_gp;
  75
  76 static LIST_HEAD(g_tf_list);
  77 static DEFINE_MUTEX(g_tf_lock);
  78
  79 static struct config_group target_core_hbagroup;
  80 static struct config_group alua_group;
  81 static struct config_group alua_lu_gps_group;
  82
  83 static inline struct se_hba *
  84 item_to_hba(struct config_item *item)
  85 {
  86         return container_of(to_config_group(item), struct se_hba, hba_group);
  87 }
  88
  89 /*
  90  * Attributes for /sys/kernel/config/target/
  91  */
  92 static ssize_t target_core_item_version_show(struct config_item *item,
  93                 char *page)
  94 {
  95         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  96                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
  97                 utsname()->sysname, utsname()->machine);
  98 }
  99
 100 CONFIGFS_ATTR_RO(target_core_item_, version);
 101
 102 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
 103 static char db_root_stage[DB_ROOT_LEN];
 104
 105 static ssize_t target_core_item_dbroot_show(struct config_item *item,
 106                                             char *page)
 107 {
 108         return sprintf(page, "%s\n", db_root);
 109 }
 110
 111 static ssize_t target_core_item_dbroot_store(struct config_item *item,
 112                                         const char *page, size_t count)
 113 {
 114         ssize_t read_bytes;
 115         struct file *fp;
 116
 117         mutex_lock(&g_tf_lock);
 118         if (!list_empty(&g_tf_list)) {
 119                 mutex_unlock(&g_tf_lock);
 120                 pr_err("db_root: cannot be changed: target drivers registered");
 121                 return -EINVAL;
 122         }
 123
 124         if (count > (DB_ROOT_LEN - 1)) {
 125                 mutex_unlock(&g_tf_lock);
 126                 pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
 127                        (int)count, DB_ROOT_LEN - 1);
 128                 return -EINVAL;
 129         }
 130
 131         read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
 132         if (!read_bytes) {
 133                 mutex_unlock(&g_tf_lock);
 134                 return -EINVAL;
 135         }
 136         if (db_root_stage[read_bytes - 1] == '\n')
 137                 db_root_stage[read_bytes - 1] = '\0';
 138
 139         /* validate new db root before accepting it */
 140         fp = filp_open(db_root_stage, O_RDONLY, 0);
 141         if (IS_ERR(fp)) {
 142                 mutex_unlock(&g_tf_lock);
 143                 pr_err("db_root: cannot open: %s\n", db_root_stage);
 144                 return -EINVAL;
 145         }
 146         if (!S_ISDIR(file_inode(fp)->i_mode)) {
 147                 filp_close(fp, NULL);
 148                 mutex_unlock(&g_tf_lock);
 149                 pr_err("db_root: not a directory: %s\n", db_root_stage);
 150                 return -EINVAL;
 151         }
 152         filp_close(fp, NULL);
 153
 154         strncpy(db_root, db_root_stage, read_bytes);
 155
 156         mutex_unlock(&g_tf_lock);
 157
 158         return read_bytes;
 159 }
 160
 161 CONFIGFS_ATTR(target_core_item_, dbroot);
 162
 163 static struct target_fabric_configfs *target_core_get_fabric(
 164         const char *name)
 165 {
 166         struct target_fabric_configfs *tf;
 167
 168         if (!name)
 169                 return NULL;
 170
 171         mutex_lock(&g_tf_lock);
 172         list_for_each_entry(tf, &g_tf_list, tf_list) {
 173                 if (!strcmp(tf->tf_ops->name, name)) {
 174                         atomic_inc(&tf->tf_access_cnt);
 175                         mutex_unlock(&g_tf_lock);
 176                         return tf;
 177                 }
 178         }
 179         mutex_unlock(&g_tf_lock);
 180
 181         return NULL;
 182 }
 183
 184 /*
 185  * Called from struct target_core_group_ops->make_group()
 186  */
 187 static struct config_group *target_core_register_fabric(
 188         struct config_group *group,
 189         const char *name)
 190 {
 191         struct target_fabric_configfs *tf;
 192         int ret;
 193
 194         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 195                         " %s\n", group, name);
 196
 197         tf = target_core_get_fabric(name);
 198         if (!tf) {
 199                 pr_debug("target_core_register_fabric() trying autoload for %s\n",
 200                          name);
 201
 202                 /*
 203                  * Below are some hardcoded request_module() calls to automatically
 204                  * local fabric modules when the following is called:
 205                  *
 206                  * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 207                  *
 208                  * Note that this does not limit which TCM fabric module can be
 209                  * registered, but simply provids auto loading logic for modules with
 210                  * mkdir(2) system calls with known TCM fabric modules.
 211                  */
 212
 213                 if (!strncmp(name, "iscsi", 5)) {
 214                         /*
 215                          * Automatically load the LIO Target fabric module when the
 216                          * following is called:
 217                          *
 218                          * mkdir -p $CONFIGFS/target/iscsi
 219                          */
 220                         ret = request_module("iscsi_target_mod");
 221                         if (ret < 0) {
 222                                 pr_debug("request_module() failed for"
 223                                          " iscsi_target_mod.ko: %d\n", ret);
 224                                 return ERR_PTR(-EINVAL);
 225                         }
 226                 } else if (!strncmp(name, "loopback", 8)) {
 227                         /*
 228                          * Automatically load the tcm_loop fabric module when the
 229                          * following is called:
 230                          *
 231                          * mkdir -p $CONFIGFS/target/loopback
 232                          */
 233                         ret = request_module("tcm_loop");
 234                         if (ret < 0) {
 235                                 pr_debug("request_module() failed for"
 236                                          " tcm_loop.ko: %d\n", ret);
 237                                 return ERR_PTR(-EINVAL);
 238                         }
 239                 }
 240
 241                 tf = target_core_get_fabric(name);
 242         }
 243
 244         if (!tf) {
 245                 pr_debug("target_core_get_fabric() failed for %s\n",
 246                          name);
 247                 return ERR_PTR(-EINVAL);
 248         }
 249         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 250                         " %s\n", tf->tf_ops->name);
 251         /*
 252          * On a successful target_core_get_fabric() look, the returned
 253          * struct target_fabric_configfs *tf will contain a usage reference.
 254          */
 255         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 256                         &tf->tf_wwn_cit);
 257
 258         config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
 259
 260         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 261                         &tf->tf_discovery_cit);
 262         configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
 263
 264         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 265                         " %s\n", tf->tf_group.cg_item.ci_name);
 266         return &tf->tf_group;
 267 }
 268
 269 /*
 270  * Called from struct target_core_group_ops->drop_item()
 271  */
 272 static void target_core_deregister_fabric(
 273         struct config_group *group,
 274         struct config_item *item)
 275 {
 276         struct target_fabric_configfs *tf = container_of(
 277                 to_config_group(item), struct target_fabric_configfs, tf_group);
 278
 279         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 280                 " tf list\n", config_item_name(item));
 281
 282         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 283                         " %s\n", tf->tf_ops->name);
 284         atomic_dec(&tf->tf_access_cnt);
 285
 286         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 287                         " %s\n", config_item_name(item));
 288
 289         configfs_remove_default_groups(&tf->tf_group);
 290         config_item_put(item);
 291 }
 292
 293 static struct configfs_group_operations target_core_fabric_group_ops = {
 294         .make_group     = &target_core_register_fabric,
 295         .drop_item      = &target_core_deregister_fabric,
 296 };
 297
 298 /*
 299  * All item attributes appearing in /sys/kernel/target/ appear here.
 300  */
 301 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 302         &target_core_item_attr_version,
 303         &target_core_item_attr_dbroot,
 304         NULL,
 305 };
 306
 307 /*
 308  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 309  */
 310 static struct config_item_type target_core_fabrics_item = {
 311         .ct_group_ops   = &target_core_fabric_group_ops,
 312         .ct_attrs       = target_core_fabric_item_attrs,
 313         .ct_owner       = THIS_MODULE,
 314 };
 315
 316 static struct configfs_subsystem target_core_fabrics = {
 317         .su_group = {
 318                 .cg_item = {
 319                         .ci_namebuf = "target",
 320                         .ci_type = &target_core_fabrics_item,
 321                 },
 322         },
 323 };
 324
 325 int target_depend_item(struct config_item *item)
 326 {
 327         return configfs_depend_item(&target_core_fabrics, item);
 328 }
 329 EXPORT_SYMBOL(target_depend_item);
 330
 331 void target_undepend_item(struct config_item *item)
 332 {
 333         return configfs_undepend_item(item);
 334 }
 335 EXPORT_SYMBOL(target_undepend_item);
 336
 337 /*##############################################################################
 338 // Start functions called by external Target Fabrics Modules
 339 //############################################################################*/
 340
 341 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 342 {
 343         if (!tfo->name) {
 344                 pr_err("Missing tfo->name\n");
 345                 return -EINVAL;
 346         }
 347         if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
 348                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
 349                         "_NAME_SIZE\n", tfo->name);
 350                 return -EINVAL;
 351         }
 352         if (!tfo->get_fabric_name) {
 353                 pr_err("Missing tfo->get_fabric_name()\n");
 354                 return -EINVAL;
 355         }
 356         if (!tfo->tpg_get_wwn) {
 357                 pr_err("Missing tfo->tpg_get_wwn()\n");
 358                 return -EINVAL;
 359         }
 360         if (!tfo->tpg_get_tag) {
 361                 pr_err("Missing tfo->tpg_get_tag()\n");
 362                 return -EINVAL;
 363         }
 364         if (!tfo->tpg_check_demo_mode) {
 365                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
 366                 return -EINVAL;
 367         }
 368         if (!tfo->tpg_check_demo_mode_cache) {
 369                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 370                 return -EINVAL;
 371         }
 372         if (!tfo->tpg_check_demo_mode_write_protect) {
 373                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 374                 return -EINVAL;
 375         }
 376         if (!tfo->tpg_check_prod_mode_write_protect) {
 377                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 378                 return -EINVAL;
 379         }
 380         if (!tfo->tpg_get_inst_index) {
 381                 pr_err("Missing tfo->tpg_get_inst_index()\n");
 382                 return -EINVAL;
 383         }
 384         if (!tfo->release_cmd) {
 385                 pr_err("Missing tfo->release_cmd()\n");
 386                 return -EINVAL;
 387         }
 388         if (!tfo->sess_get_index) {
 389                 pr_err("Missing tfo->sess_get_index()\n");
 390                 return -EINVAL;
 391         }
 392         if (!tfo->write_pending) {
 393                 pr_err("Missing tfo->write_pending()\n");
 394                 return -EINVAL;
 395         }
 396         if (!tfo->write_pending_status) {
 397                 pr_err("Missing tfo->write_pending_status()\n");
 398                 return -EINVAL;
 399         }
 400         if (!tfo->set_default_node_attributes) {
 401                 pr_err("Missing tfo->set_default_node_attributes()\n");
 402                 return -EINVAL;
 403         }
 404         if (!tfo->get_cmd_state) {
 405                 pr_err("Missing tfo->get_cmd_state()\n");
 406                 return -EINVAL;
 407         }
 408         if (!tfo->queue_data_in) {
 409                 pr_err("Missing tfo->queue_data_in()\n");
 410                 return -EINVAL;
 411         }
 412         if (!tfo->queue_status) {
 413                 pr_err("Missing tfo->queue_status()\n");
 414                 return -EINVAL;
 415         }
 416         if (!tfo->queue_tm_rsp) {
 417                 pr_err("Missing tfo->queue_tm_rsp()\n");
 418                 return -EINVAL;
 419         }
 420         if (!tfo->aborted_task) {
 421                 pr_err("Missing tfo->aborted_task()\n");
 422                 return -EINVAL;
 423         }
 424         if (!tfo->check_stop_free) {
 425                 pr_err("Missing tfo->check_stop_free()\n");
 426                 return -EINVAL;
 427         }
 428         /*
 429          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 430          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 431          * target_core_fabric_configfs.c WWN+TPG group context code.
 432          */
 433         if (!tfo->fabric_make_wwn) {
 434                 pr_err("Missing tfo->fabric_make_wwn()\n");
 435                 return -EINVAL;
 436         }
 437         if (!tfo->fabric_drop_wwn) {
 438                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 439                 return -EINVAL;
 440         }
 441         if (!tfo->fabric_make_tpg) {
 442                 pr_err("Missing tfo->fabric_make_tpg()\n");
 443                 return -EINVAL;
 444         }
 445         if (!tfo->fabric_drop_tpg) {
 446                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 int target_register_template(const struct target_core_fabric_ops *fo)
 454 {
 455         struct target_fabric_configfs *tf;
 456         int ret;
 457
 458         ret = target_fabric_tf_ops_check(fo);
 459         if (ret)
 460                 return ret;
 461
 462         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 463         if (!tf) {
 464                 pr_err("%s: could not allocate memory!\n", __func__);
 465                 return -ENOMEM;
 466         }
 467
 468         INIT_LIST_HEAD(&tf->tf_list);
 469         atomic_set(&tf->tf_access_cnt, 0);
 470         tf->tf_ops = fo;
 471         target_fabric_setup_cits(tf);
 472
 473         mutex_lock(&g_tf_lock);
 474         list_add_tail(&tf->tf_list, &g_tf_list);
 475         mutex_unlock(&g_tf_lock);
 476
 477         return 0;
 478 }
 479 EXPORT_SYMBOL(target_register_template);
 480
 481 void target_unregister_template(const struct target_core_fabric_ops *fo)
 482 {
 483         struct target_fabric_configfs *t;
 484
 485         mutex_lock(&g_tf_lock);
 486         list_for_each_entry(t, &g_tf_list, tf_list) {
 487                 if (!strcmp(t->tf_ops->name, fo->name)) {
 488                         BUG_ON(atomic_read(&t->tf_access_cnt));
 489                         list_del(&t->tf_list);
 490                         mutex_unlock(&g_tf_lock);
 491                         /*
 492                          * Wait for any outstanding fabric se_deve_entry->rcu_head
 493                          * callbacks to complete post kfree_rcu(), before allowing
 494                          * fabric driver unload of TFO->module to proceed.
 495                          */
 496                         rcu_barrier();
 497                         kfree(t);
 498                         return;
 499                 }
 500         }
 501         mutex_unlock(&g_tf_lock);
 502 }
 503 EXPORT_SYMBOL(target_unregister_template);
 504
 505 /*##############################################################################
 506 // Stop functions called by external Target Fabrics Modules
 507 //############################################################################*/
 508
 509 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
 510 {
 511         return container_of(to_config_group(item), struct se_dev_attrib,
 512                         da_group);
 513 }
 514
 515 /* Start functions for struct config_item_type tb_dev_attrib_cit */
 516 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
 517 static ssize_t _name##_show(struct config_item *item, char *page)       \
 518 {                                                                       \
 519         return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
 520 }
 521
 522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
 523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
 524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
 525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
 526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
 527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
 528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
 529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
 530 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
 531 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
 532 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
 533 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
 534 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
 535 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_format);
 536 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
 537 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
 538 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
 539 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
 540 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
 541 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
 542 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
 543 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
 544 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
 545 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
 546 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
 547 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
 548 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
 549 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
 550 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
 551 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
 552
 553 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
 554 static ssize_t _name##_store(struct config_item *item, const char *page,\
 555                 size_t count)                                           \
 556 {                                                                       \
 557         struct se_dev_attrib *da = to_attrib(item);                     \
 558         u32 val;                                                        \
 559         int ret;                                                        \
 560                                                                         \
 561         ret = kstrtou32(page, 0, &val);                                 \
 562         if (ret < 0)                                                    \
 563                 return ret;                                             \
 564         da->_name = val;                                                \
 565         return count;                                                   \
 566 }
 567
 568 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
 569 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
 570 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
 571 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
 572 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
 573
 574 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
 575 static ssize_t _name##_store(struct config_item *item, const char *page,        \
 576                 size_t count)                                           \
 577 {                                                                       \
 578         struct se_dev_attrib *da = to_attrib(item);                     \
 579         bool flag;                                                      \
 580         int ret;                                                        \
 581                                                                         \
 582         ret = strtobool(page, &flag);                                   \
 583         if (ret < 0)                                                    \
 584                 return ret;                                             \
 585         da->_name = flag;                                               \
 586         return count;                                                   \
 587 }
 588
 589 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
 590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
 591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
 592 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
 593 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
 594
 595 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
 596 static ssize_t _name##_store(struct config_item *item, const char *page,\
 597                 size_t count)                                           \
 598 {                                                                       \
 599         printk_once(KERN_WARNING                                        \
 600                 "ignoring deprecated %s attribute\n",                   \
 601                 __stringify(_name));                                    \
 602         return count;                                                   \
 603 }
 604
 605 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
 606 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
 607
 608 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 609 {
 610         const char *configname;
 611
 612         configname = config_item_name(&dev->dev_group.cg_item);
 613         if (strlen(configname) >= 16) {
 614                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 615                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 616                         configname);
 617         }
 618         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 619 }
 620
 621 static ssize_t emulate_model_alias_store(struct config_item *item,
 622                 const char *page, size_t count)
 623 {
 624         struct se_dev_attrib *da = to_attrib(item);
 625         struct se_device *dev = da->da_dev;
 626         bool flag;
 627         int ret;
 628
 629         if (dev->export_count) {
 630                 pr_err("dev[%p]: Unable to change model alias"
 631                         " while export_count is %d\n",
 632                         dev, dev->export_count);
 633                 return -EINVAL;
 634         }
 635
 636         ret = strtobool(page, &flag);
 637         if (ret < 0)
 638                 return ret;
 639
 640         if (flag) {
 641                 dev_set_t10_wwn_model_alias(dev);
 642         } else {
 643                 strncpy(&dev->t10_wwn.model[0],
 644                         dev->transport->inquiry_prod, 16);
 645         }
 646         da->emulate_model_alias = flag;
 647         return count;
 648 }
 649
 650 static ssize_t emulate_write_cache_store(struct config_item *item,
 651                 const char *page, size_t count)
 652 {
 653         struct se_dev_attrib *da = to_attrib(item);
 654         bool flag;
 655         int ret;
 656
 657         ret = strtobool(page, &flag);
 658         if (ret < 0)
 659                 return ret;
 660
 661         if (flag && da->da_dev->transport->get_write_cache) {
 662                 pr_err("emulate_write_cache not supported for this device\n");
 663                 return -EINVAL;
 664         }
 665
 666         da->emulate_write_cache = flag;
 667         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 668                         da->da_dev, flag);
 669         return count;
 670 }
 671
 672 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
 673                 const char *page, size_t count)
 674 {
 675         struct se_dev_attrib *da = to_attrib(item);
 676         u32 val;
 677         int ret;
 678
 679         ret = kstrtou32(page, 0, &val);
 680         if (ret < 0)
 681                 return ret;
 682
 683         if (val != 0 && val != 1 && val != 2) {
 684                 pr_err("Illegal value %d\n", val);
 685                 return -EINVAL;
 686         }
 687
 688         if (da->da_dev->export_count) {
 689                 pr_err("dev[%p]: Unable to change SE Device"
 690                         " UA_INTRLCK_CTRL while export_count is %d\n",
 691                         da->da_dev, da->da_dev->export_count);
 692                 return -EINVAL;
 693         }
 694         da->emulate_ua_intlck_ctrl = val;
 695         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 696                 da->da_dev, val);
 697         return count;
 698 }
 699
 700 static ssize_t emulate_tas_store(struct config_item *item,
 701                 const char *page, size_t count)
 702 {
 703         struct se_dev_attrib *da = to_attrib(item);
 704         bool flag;
 705         int ret;
 706
 707         ret = strtobool(page, &flag);
 708         if (ret < 0)
 709                 return ret;
 710
 711         if (da->da_dev->export_count) {
 712                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 713                         " export_count is %d\n",
 714                         da->da_dev, da->da_dev->export_count);
 715                 return -EINVAL;
 716         }
 717         da->emulate_tas = flag;
 718         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 719                 da->da_dev, flag ? "Enabled" : "Disabled");
 720
 721         return count;
 722 }
 723
 724 static ssize_t emulate_tpu_store(struct config_item *item,
 725                 const char *page, size_t count)
 726 {
 727         struct se_dev_attrib *da = to_attrib(item);
 728         bool flag;
 729         int ret;
 730
 731         ret = strtobool(page, &flag);
 732         if (ret < 0)
 733                 return ret;
 734
 735         /*
 736          * We expect this value to be non-zero when generic Block Layer
 737          * Discard supported is detected iblock_create_virtdevice().
 738          */
 739         if (flag && !da->max_unmap_block_desc_count) {
 740                 pr_err("Generic Block Discard not supported\n");
 741                 return -ENOSYS;
 742         }
 743
 744         da->emulate_tpu = flag;
 745         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 746                 da->da_dev, flag);
 747         return count;
 748 }
 749
 750 static ssize_t emulate_tpws_store(struct config_item *item,
 751                 const char *page, size_t count)
 752 {
 753         struct se_dev_attrib *da = to_attrib(item);
 754         bool flag;
 755         int ret;
 756
 757         ret = strtobool(page, &flag);
 758         if (ret < 0)
 759                 return ret;
 760
 761         /*
 762          * We expect this value to be non-zero when generic Block Layer
 763          * Discard supported is detected iblock_create_virtdevice().
 764          */
 765         if (flag && !da->max_unmap_block_desc_count) {
 766                 pr_err("Generic Block Discard not supported\n");
 767                 return -ENOSYS;
 768         }
 769
 770         da->emulate_tpws = flag;
 771         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 772                                 da->da_dev, flag);
 773         return count;
 774 }
 775
 776 static ssize_t pi_prot_type_store(struct config_item *item,
 777                 const char *page, size_t count)
 778 {
 779         struct se_dev_attrib *da = to_attrib(item);
 780         int old_prot = da->pi_prot_type, ret;
 781         struct se_device *dev = da->da_dev;
 782         u32 flag;
 783
 784         ret = kstrtou32(page, 0, &flag);
 785         if (ret < 0)
 786                 return ret;
 787
 788         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 789                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 790                 return -EINVAL;
 791         }
 792         if (flag == 2) {
 793                 pr_err("DIF TYPE2 protection currently not supported\n");
 794                 return -ENOSYS;
 795         }
 796         if (da->hw_pi_prot_type) {
 797                 pr_warn("DIF protection enabled on underlying hardware,"
 798                         " ignoring\n");
 799                 return count;
 800         }
 801         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 802                 /* 0 is only allowed value for non-supporting backends */
 803                 if (flag == 0)
 804                         return count;
 805
 806                 pr_err("DIF protection not supported by backend: %s\n",
 807                        dev->transport->name);
 808                 return -ENOSYS;
 809         }
 810         if (!(dev->dev_flags & DF_CONFIGURED)) {
 811                 pr_err("DIF protection requires device to be configured\n");
 812                 return -ENODEV;
 813         }
 814         if (dev->export_count) {
 815                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 816                        " export_count is %d\n", dev, dev->export_count);
 817                 return -EINVAL;
 818         }
 819
 820         da->pi_prot_type = flag;
 821
 822         if (flag && !old_prot) {
 823                 ret = dev->transport->init_prot(dev);
 824                 if (ret) {
 825                         da->pi_prot_type = old_prot;
 826                         return ret;
 827                 }
 828
 829         } else if (!flag && old_prot) {
 830                 dev->transport->free_prot(dev);
 831         }
 832
 833         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 834         return count;
 835 }
 836
 837 static ssize_t pi_prot_format_store(struct config_item *item,
 838                 const char *page, size_t count)
 839 {
 840         struct se_dev_attrib *da = to_attrib(item);
 841         struct se_device *dev = da->da_dev;
 842         bool flag;
 843         int ret;
 844
 845         ret = strtobool(page, &flag);
 846         if (ret < 0)
 847                 return ret;
 848
 849         if (!flag)
 850                 return count;
 851
 852         if (!dev->transport->format_prot) {
 853                 pr_err("DIF protection format not supported by backend %s\n",
 854                        dev->transport->name);
 855                 return -ENOSYS;
 856         }
 857         if (!(dev->dev_flags & DF_CONFIGURED)) {
 858                 pr_err("DIF protection format requires device to be configured\n");
 859                 return -ENODEV;
 860         }
 861         if (dev->export_count) {
 862                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 863                        " export_count is %d\n", dev, dev->export_count);
 864                 return -EINVAL;
 865         }
 866
 867         ret = dev->transport->format_prot(dev);
 868         if (ret)
 869                 return ret;
 870
 871         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
 872         return count;
 873 }
 874
 875 static ssize_t force_pr_aptpl_store(struct config_item *item,
 876                 const char *page, size_t count)
 877 {
 878         struct se_dev_attrib *da = to_attrib(item);
 879         bool flag;
 880         int ret;
 881
 882         ret = strtobool(page, &flag);
 883         if (ret < 0)
 884                 return ret;
 885         if (da->da_dev->export_count) {
 886                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
 887                        " export_count is %d\n",
 888                        da->da_dev, da->da_dev->export_count);
 889                 return -EINVAL;
 890         }
 891
 892         da->force_pr_aptpl = flag;
 893         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
 894         return count;
 895 }
 896
 897 static ssize_t emulate_rest_reord_store(struct config_item *item,
 898                 const char *page, size_t count)
 899 {
 900         struct se_dev_attrib *da = to_attrib(item);
 901         bool flag;
 902         int ret;
 903
 904         ret = strtobool(page, &flag);
 905         if (ret < 0)
 906                 return ret;
 907
 908         if (flag != 0) {
 909                 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
 910                         " reordering not implemented\n", da->da_dev);
 911                 return -ENOSYS;
 912         }
 913         da->emulate_rest_reord = flag;
 914         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
 915                 da->da_dev, flag);
 916         return count;
 917 }
 918
 919 static ssize_t unmap_zeroes_data_store(struct config_item *item,
 920                 const char *page, size_t count)
 921 {
 922         struct se_dev_attrib *da = to_attrib(item);
 923         bool flag;
 924         int ret;
 925
 926         ret = strtobool(page, &flag);
 927         if (ret < 0)
 928                 return ret;
 929
 930         if (da->da_dev->export_count) {
 931                 pr_err("dev[%p]: Unable to change SE Device"
 932                        " unmap_zeroes_data while export_count is %d\n",
 933                        da->da_dev, da->da_dev->export_count);
 934                 return -EINVAL;
 935         }
 936         /*
 937          * We expect this value to be non-zero when generic Block Layer
 938          * Discard supported is detected iblock_configure_device().
 939          */
 940         if (flag && !da->max_unmap_block_desc_count) {
 941                 pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
 942                        " because max_unmap_block_desc_count is zero\n",
 943                        da->da_dev);
 944                 return -ENOSYS;
 945         }
 946         da->unmap_zeroes_data = flag;
 947         pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
 948                  da->da_dev, flag);
 949         return count;
 950 }
 951
 952 /*
 953  * Note, this can only be called on unexported SE Device Object.
 954  */
 955 static ssize_t queue_depth_store(struct config_item *item,
 956                 const char *page, size_t count)
 957 {
 958         struct se_dev_attrib *da = to_attrib(item);
 959         struct se_device *dev = da->da_dev;
 960         u32 val;
 961         int ret;
 962
 963         ret = kstrtou32(page, 0, &val);
 964         if (ret < 0)
 965                 return ret;
 966
 967         if (dev->export_count) {
 968                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
 969                         " export_count is %d\n",
 970                         dev, dev->export_count);
 971                 return -EINVAL;
 972         }
 973         if (!val) {
 974                 pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
 975                 return -EINVAL;
 976         }
 977
 978         if (val > dev->dev_attrib.queue_depth) {
 979                 if (val > dev->dev_attrib.hw_queue_depth) {
 980                         pr_err("dev[%p]: Passed queue_depth:"
 981                                 " %u exceeds TCM/SE_Device MAX"
 982                                 " TCQ: %u\n", dev, val,
 983                                 dev->dev_attrib.hw_queue_depth);
 984                         return -EINVAL;
 985                 }
 986         }
 987         da->queue_depth = dev->queue_depth = val;
 988         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
 989         return count;
 990 }
 991
 992 static ssize_t optimal_sectors_store(struct config_item *item,
 993                 const char *page, size_t count)
 994 {
 995         struct se_dev_attrib *da = to_attrib(item);
 996         u32 val;
 997         int ret;
 998
 999         ret = kstrtou32(page, 0, &val);
1000         if (ret < 0)
1001                 return ret;
1002
1003         if (da->da_dev->export_count) {
1004                 pr_err("dev[%p]: Unable to change SE Device"
1005                         " optimal_sectors while export_count is %d\n",
1006                         da->da_dev, da->da_dev->export_count);
1007                 return -EINVAL;
1008         }
1009         if (val > da->hw_max_sectors) {
1010                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1011                         " greater than hw_max_sectors: %u\n",
1012                         da->da_dev, val, da->hw_max_sectors);
1013                 return -EINVAL;
1014         }
1015
1016         da->optimal_sectors = val;
1017         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1018                         da->da_dev, val);
1019         return count;
1020 }
1021
1022 static ssize_t block_size_store(struct config_item *item,
1023                 const char *page, size_t count)
1024 {
1025         struct se_dev_attrib *da = to_attrib(item);
1026         u32 val;
1027         int ret;
1028
1029         ret = kstrtou32(page, 0, &val);
1030         if (ret < 0)
1031                 return ret;
1032
1033         if (da->da_dev->export_count) {
1034                 pr_err("dev[%p]: Unable to change SE Device block_size"
1035                         " while export_count is %d\n",
1036                         da->da_dev, da->da_dev->export_count);
1037                 return -EINVAL;
1038         }
1039
1040         if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1041                 pr_err("dev[%p]: Illegal value for block_device: %u"
1042                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1043                         da->da_dev, val);
1044                 return -EINVAL;
1045         }
1046
1047         da->block_size = val;
1048         if (da->max_bytes_per_io)
1049                 da->hw_max_sectors = da->max_bytes_per_io / val;
1050
1051         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1052                         da->da_dev, val);
1053         return count;
1054 }
1055
1056 CONFIGFS_ATTR(, emulate_model_alias);
1057 CONFIGFS_ATTR(, emulate_dpo);
1058 CONFIGFS_ATTR(, emulate_fua_write);
1059 CONFIGFS_ATTR(, emulate_fua_read);
1060 CONFIGFS_ATTR(, emulate_write_cache);
1061 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1062 CONFIGFS_ATTR(, emulate_tas);
1063 CONFIGFS_ATTR(, emulate_tpu);
1064 CONFIGFS_ATTR(, emulate_tpws);
1065 CONFIGFS_ATTR(, emulate_caw);
1066 CONFIGFS_ATTR(, emulate_3pc);
1067 CONFIGFS_ATTR(, pi_prot_type);
1068 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1069 CONFIGFS_ATTR(, pi_prot_format);
1070 CONFIGFS_ATTR(, enforce_pr_isids);
1071 CONFIGFS_ATTR(, is_nonrot);
1072 CONFIGFS_ATTR(, emulate_rest_reord);
1073 CONFIGFS_ATTR(, force_pr_aptpl);
1074 CONFIGFS_ATTR_RO(, hw_block_size);
1075 CONFIGFS_ATTR(, block_size);
1076 CONFIGFS_ATTR_RO(, hw_max_sectors);
1077 CONFIGFS_ATTR(, optimal_sectors);
1078 CONFIGFS_ATTR_RO(, hw_queue_depth);
1079 CONFIGFS_ATTR(, queue_depth);
1080 CONFIGFS_ATTR(, max_unmap_lba_count);
1081 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1082 CONFIGFS_ATTR(, unmap_granularity);
1083 CONFIGFS_ATTR(, unmap_granularity_alignment);
1084 CONFIGFS_ATTR(, unmap_zeroes_data);
1085 CONFIGFS_ATTR(, max_write_same_len);
1086
1087 /*
1088  * dev_attrib attributes for devices using the target core SBC/SPC
1089  * interpreter.  Any backend using spc_parse_cdb should be using
1090  * these.
1091  */
1092 struct configfs_attribute *sbc_attrib_attrs[] = {
1093         &attr_emulate_model_alias,
1094         &attr_emulate_dpo,
1095         &attr_emulate_fua_write,
1096         &attr_emulate_fua_read,
1097         &attr_emulate_write_cache,
1098         &attr_emulate_ua_intlck_ctrl,
1099         &attr_emulate_tas,
1100         &attr_emulate_tpu,
1101         &attr_emulate_tpws,
1102         &attr_emulate_caw,
1103         &attr_emulate_3pc,
1104         &attr_pi_prot_type,
1105         &attr_hw_pi_prot_type,
1106         &attr_pi_prot_format,
1107         &attr_enforce_pr_isids,
1108         &attr_is_nonrot,
1109         &attr_emulate_rest_reord,
1110         &attr_force_pr_aptpl,
1111         &attr_hw_block_size,
1112         &attr_block_size,
1113         &attr_hw_max_sectors,
1114         &attr_optimal_sectors,
1115         &attr_hw_queue_depth,
1116         &attr_queue_depth,
1117         &attr_max_unmap_lba_count,
1118         &attr_max_unmap_block_desc_count,
1119         &attr_unmap_granularity,
1120         &attr_unmap_granularity_alignment,
1121         &attr_unmap_zeroes_data,
1122         &attr_max_write_same_len,
1123         NULL,
1124 };
1125 EXPORT_SYMBOL(sbc_attrib_attrs);
1126
1127 /*
1128  * Minimal dev_attrib attributes for devices passing through CDBs.
1129  * In this case we only provide a few read-only attributes for
1130  * backwards compatibility.
1131  */
1132 struct configfs_attribute *passthrough_attrib_attrs[] = {
1133         &attr_hw_pi_prot_type,
1134         &attr_hw_block_size,
1135         &attr_hw_max_sectors,
1136         &attr_hw_queue_depth,
1137         NULL,
1138 };
1139 EXPORT_SYMBOL(passthrough_attrib_attrs);
1140
1141 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1142
1143 /* End functions for struct config_item_type tb_dev_attrib_cit */
1144
1145 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1146
1147 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1148 {
1149         return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1150 }
1151
1152 /*
1153  * VPD page 0x80 Unit serial
1154  */
1155 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1156                 char *page)
1157 {
1158         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1159                 &to_t10_wwn(item)->unit_serial[0]);
1160 }
1161
1162 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1163                 const char *page, size_t count)
1164 {
1165         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1166         struct se_device *dev = t10_wwn->t10_dev;
1167         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
1168
1169         /*
1170          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1171          * from the struct scsi_device level firmware, do not allow
1172          * VPD Unit Serial to be emulated.
1173          *
1174          * Note this struct scsi_device could also be emulating VPD
1175          * information from its drivers/scsi LLD.  But for now we assume
1176          * it is doing 'the right thing' wrt a world wide unique
1177          * VPD Unit Serial Number that OS dependent multipath can depend on.
1178          */
1179         if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1180                 pr_err("Underlying SCSI device firmware provided VPD"
1181                         " Unit Serial, ignoring request\n");
1182                 return -EOPNOTSUPP;
1183         }
1184
1185         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1186                 pr_err("Emulated VPD Unit Serial exceeds"
1187                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1188                 return -EOVERFLOW;
1189         }
1190         /*
1191          * Check to see if any active $FABRIC_MOD exports exist.  If they
1192          * do exist, fail here as changing this information on the fly
1193          * (underneath the initiator side OS dependent multipath code)
1194          * could cause negative effects.
1195          */
1196         if (dev->export_count) {
1197                 pr_err("Unable to set VPD Unit Serial while"
1198                         " active %d $FABRIC_MOD exports exist\n",
1199                         dev->export_count);
1200                 return -EINVAL;
1201         }
1202
1203         /*
1204          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1205          *
1206          * Also, strip any newline added from the userspace
1207          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1208          */
1209         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
1210         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1211         snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1212                         "%s", strstrip(buf));
1213         dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1214
1215         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1216                         " %s\n", dev->t10_wwn.unit_serial);
1217
1218         return count;
1219 }
1220
1221 /*
1222  * VPD page 0x83 Protocol Identifier
1223  */
1224 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1225                 char *page)
1226 {
1227         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1228         struct t10_vpd *vpd;
1229         unsigned char buf[VPD_TMP_BUF_SIZE];
1230         ssize_t len = 0;
1231
1232         memset(buf, 0, VPD_TMP_BUF_SIZE);
1233
1234         spin_lock(&t10_wwn->t10_vpd_lock);
1235         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1236                 if (!vpd->protocol_identifier_set)
1237                         continue;
1238
1239                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1240
1241                 if (len + strlen(buf) >= PAGE_SIZE)
1242                         break;
1243
1244                 len += sprintf(page+len, "%s", buf);
1245         }
1246         spin_unlock(&t10_wwn->t10_vpd_lock);
1247
1248         return len;
1249 }
1250
1251 /*
1252  * Generic wrapper for dumping VPD identifiers by association.
1253  */
1254 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
1255 static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
1256                 char *page)                                             \
1257 {                                                                       \
1258         struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
1259         struct t10_vpd *vpd;                                            \
1260         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
1261         ssize_t len = 0;                                                \
1262                                                                         \
1263         spin_lock(&t10_wwn->t10_vpd_lock);                              \
1264         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
1265                 if (vpd->association != _assoc)                         \
1266                         continue;                                       \
1267                                                                         \
1268                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1269                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
1270                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1271                         break;                                          \
1272                 len += sprintf(page+len, "%s", buf);                    \
1273                                                                         \
1274                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1275                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1276                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1277                         break;                                          \
1278                 len += sprintf(page+len, "%s", buf);                    \
1279                                                                         \
1280                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1281                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1282                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1283                         break;                                          \
1284                 len += sprintf(page+len, "%s", buf);                    \
1285         }                                                               \
1286         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
1287                                                                         \
1288         return len;                                                     \
1289 }
1290
1291 /* VPD page 0x83 Association: Logical Unit */
1292 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1293 /* VPD page 0x83 Association: Target Port */
1294 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1295 /* VPD page 0x83 Association: SCSI Target Device */
1296 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1297
1298 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1299 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1300 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1301 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1302 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1303
1304 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1305         &target_wwn_attr_vpd_unit_serial,
1306         &target_wwn_attr_vpd_protocol_identifier,
1307         &target_wwn_attr_vpd_assoc_logical_unit,
1308         &target_wwn_attr_vpd_assoc_target_port,
1309         &target_wwn_attr_vpd_assoc_scsi_target_device,
1310         NULL,
1311 };
1312
1313 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1314
1315 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1316
1317 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1318
1319 static struct se_device *pr_to_dev(struct config_item *item)
1320 {
1321         return container_of(to_config_group(item), struct se_device,
1322                         dev_pr_group);
1323 }
1324
1325 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1326                 char *page)
1327 {
1328         struct se_node_acl *se_nacl;
1329         struct t10_pr_registration *pr_reg;
1330         char i_buf[PR_REG_ISID_ID_LEN];
1331
1332         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1333
1334         pr_reg = dev->dev_pr_res_holder;
1335         if (!pr_reg)
1336                 return sprintf(page, "No SPC-3 Reservation holder\n");
1337
1338         se_nacl = pr_reg->pr_reg_nacl;
1339         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1340
1341         return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1342                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1343                 se_nacl->initiatorname, i_buf);
1344 }
1345
1346 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1347                 char *page)
1348 {
1349         struct se_node_acl *se_nacl;
1350         ssize_t len;
1351
1352         se_nacl = dev->dev_reserved_node_acl;
1353         if (se_nacl) {
1354                 len = sprintf(page,
1355                               "SPC-2 Reservation: %s Initiator: %s\n",
1356                               se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1357                               se_nacl->initiatorname);
1358         } else {
1359                 len = sprintf(page, "No SPC-2 Reservation holder\n");
1360         }
1361         return len;
1362 }
1363
1364 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1365 {
1366         struct se_device *dev = pr_to_dev(item);
1367         int ret;
1368
1369         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1370                 return sprintf(page, "Passthrough\n");
1371
1372         spin_lock(&dev->dev_reservation_lock);
1373         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1374                 ret = target_core_dev_pr_show_spc2_res(dev, page);
1375         else
1376                 ret = target_core_dev_pr_show_spc3_res(dev, page);
1377         spin_unlock(&dev->dev_reservation_lock);
1378         return ret;
1379 }
1380
1381 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1382                 char *page)
1383 {
1384         struct se_device *dev = pr_to_dev(item);
1385         ssize_t len = 0;
1386
1387         spin_lock(&dev->dev_reservation_lock);
1388         if (!dev->dev_pr_res_holder) {
1389                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1390         } else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1391                 len = sprintf(page, "SPC-3 Reservation: All Target"
1392                         " Ports registration\n");
1393         } else {
1394                 len = sprintf(page, "SPC-3 Reservation: Single"
1395                         " Target Port registration\n");
1396         }
1397
1398         spin_unlock(&dev->dev_reservation_lock);
1399         return len;
1400 }
1401
1402 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1403                 char *page)
1404 {
1405         return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1406 }
1407
1408
1409 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1410                 char *page)
1411 {
1412         struct se_device *dev = pr_to_dev(item);
1413         struct se_node_acl *se_nacl;
1414         struct se_portal_group *se_tpg;
1415         struct t10_pr_registration *pr_reg;
1416         const struct target_core_fabric_ops *tfo;
1417         ssize_t len = 0;
1418
1419         spin_lock(&dev->dev_reservation_lock);
1420         pr_reg = dev->dev_pr_res_holder;
1421         if (!pr_reg) {
1422                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1423                 goto out_unlock;
1424         }
1425
1426         se_nacl = pr_reg->pr_reg_nacl;
1427         se_tpg = se_nacl->se_tpg;
1428         tfo = se_tpg->se_tpg_tfo;
1429
1430         len += sprintf(page+len, "SPC-3 Reservation: %s"
1431                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1432                 tfo->tpg_get_wwn(se_tpg));
1433         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1434                 " Identifier Tag: %hu %s Portal Group Tag: %hu"
1435                 " %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1436                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1437                 tfo->get_fabric_name(), pr_reg->pr_aptpl_target_lun);
1438
1439 out_unlock:
1440         spin_unlock(&dev->dev_reservation_lock);
1441         return len;
1442 }
1443
1444
1445 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1446                 char *page)
1447 {
1448         struct se_device *dev = pr_to_dev(item);
1449         const struct target_core_fabric_ops *tfo;
1450         struct t10_pr_registration *pr_reg;
1451         unsigned char buf[384];
1452         char i_buf[PR_REG_ISID_ID_LEN];
1453         ssize_t len = 0;
1454         int reg_count = 0;
1455
1456         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1457
1458         spin_lock(&dev->t10_pr.registration_lock);
1459         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1460                         pr_reg_list) {
1461
1462                 memset(buf, 0, 384);
1463                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1464                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1465                 core_pr_dump_initiator_port(pr_reg, i_buf,
1466                                         PR_REG_ISID_ID_LEN);
1467                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1468                         tfo->get_fabric_name(),
1469                         pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1470                         pr_reg->pr_res_generation);
1471
1472                 if (len + strlen(buf) >= PAGE_SIZE)
1473                         break;
1474
1475                 len += sprintf(page+len, "%s", buf);
1476                 reg_count++;
1477         }
1478         spin_unlock(&dev->t10_pr.registration_lock);
1479
1480         if (!reg_count)
1481                 len += sprintf(page+len, "None\n");
1482
1483         return len;
1484 }
1485
1486 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1487 {
1488         struct se_device *dev = pr_to_dev(item);
1489         struct t10_pr_registration *pr_reg;
1490         ssize_t len = 0;
1491
1492         spin_lock(&dev->dev_reservation_lock);
1493         pr_reg = dev->dev_pr_res_holder;
1494         if (pr_reg) {
1495                 len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1496                         core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1497         } else {
1498                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1499         }
1500
1501         spin_unlock(&dev->dev_reservation_lock);
1502         return len;
1503 }
1504
1505 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1506 {
1507         struct se_device *dev = pr_to_dev(item);
1508
1509         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1510                 return sprintf(page, "SPC_PASSTHROUGH\n");
1511         else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1512                 return sprintf(page, "SPC2_RESERVATIONS\n");
1513         else
1514                 return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1515 }
1516
1517 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1518                 char *page)
1519 {
1520         struct se_device *dev = pr_to_dev(item);
1521
1522         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1523                 return 0;
1524
1525         return sprintf(page, "APTPL Bit Status: %s\n",
1526                 (dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1527 }
1528
1529 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1530                 char *page)
1531 {
1532         struct se_device *dev = pr_to_dev(item);
1533
1534         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1535                 return 0;
1536
1537         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1538 }
1539
1540 enum {
1541         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1542         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1543         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1544         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1545 };
1546
1547 static match_table_t tokens = {
1548         {Opt_initiator_fabric, "initiator_fabric=%s"},
1549         {Opt_initiator_node, "initiator_node=%s"},
1550         {Opt_initiator_sid, "initiator_sid=%s"},
1551         {Opt_sa_res_key, "sa_res_key=%s"},
1552         {Opt_res_holder, "res_holder=%d"},
1553         {Opt_res_type, "res_type=%d"},
1554         {Opt_res_scope, "res_scope=%d"},
1555         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1556         {Opt_mapped_lun, "mapped_lun=%lld"},
1557         {Opt_target_fabric, "target_fabric=%s"},
1558         {Opt_target_node, "target_node=%s"},
1559         {Opt_tpgt, "tpgt=%d"},
1560         {Opt_port_rtpi, "port_rtpi=%d"},
1561         {Opt_target_lun, "target_lun=%lld"},
1562         {Opt_err, NULL}
1563 };
1564
1565 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1566                 const char *page, size_t count)
1567 {
1568         struct se_device *dev = pr_to_dev(item);
1569         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1570         unsigned char *t_fabric = NULL, *t_port = NULL;
1571         char *orig, *ptr, *opts;
1572         substring_t args[MAX_OPT_ARGS];
1573         unsigned long long tmp_ll;
1574         u64 sa_res_key = 0;
1575         u64 mapped_lun = 0, target_lun = 0;
1576         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1577         u16 tpgt = 0;
1578         u8 type = 0;
1579
1580         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1581                 return count;
1582         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1583                 return count;
1584
1585         if (dev->export_count) {
1586                 pr_debug("Unable to process APTPL metadata while"
1587                         " active fabric exports exist\n");
1588                 return -EINVAL;
1589         }
1590
1591         opts = kstrdup(page, GFP_KERNEL);
1592         if (!opts)
1593                 return -ENOMEM;
1594
1595         orig = opts;
1596         while ((ptr = strsep(&opts, ",\n")) != NULL) {
1597                 if (!*ptr)
1598                         continue;
1599
1600                 token = match_token(ptr, tokens, args);
1601                 switch (token) {
1602                 case Opt_initiator_fabric:
1603                         i_fabric = match_strdup(args);
1604                         if (!i_fabric) {
1605                                 ret = -ENOMEM;
1606                                 goto out;
1607                         }
1608                         break;
1609                 case Opt_initiator_node:
1610                         i_port = match_strdup(args);
1611                         if (!i_port) {
1612                                 ret = -ENOMEM;
1613                                 goto out;
1614                         }
1615                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1616                                 pr_err("APTPL metadata initiator_node="
1617                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1618                                         PR_APTPL_MAX_IPORT_LEN);
1619                                 ret = -EINVAL;
1620                                 break;
1621                         }
1622                         break;
1623                 case Opt_initiator_sid:
1624                         isid = match_strdup(args);
1625                         if (!isid) {
1626                                 ret = -ENOMEM;
1627                                 goto out;
1628                         }
1629                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1630                                 pr_err("APTPL metadata initiator_isid"
1631                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1632                                         PR_REG_ISID_LEN);
1633                                 ret = -EINVAL;
1634                                 break;
1635                         }
1636                         break;
1637                 case Opt_sa_res_key:
1638                         ret = kstrtoull(args->from, 0, &tmp_ll);
1639                         if (ret < 0) {
1640                                 pr_err("kstrtoull() failed for sa_res_key=\n");
1641                                 goto out;
1642                         }
1643                         sa_res_key = (u64)tmp_ll;
1644                         break;
1645                 /*
1646                  * PR APTPL Metadata for Reservation
1647                  */
1648                 case Opt_res_holder:
1649                         ret = match_int(args, &arg);
1650                         if (ret)
1651                                 goto out;
1652                         res_holder = arg;
1653                         break;
1654                 case Opt_res_type:
1655                         ret = match_int(args, &arg);
1656                         if (ret)
1657                                 goto out;
1658                         type = (u8)arg;
1659                         break;
1660                 case Opt_res_scope:
1661                         ret = match_int(args, &arg);
1662                         if (ret)
1663                                 goto out;
1664                         break;
1665                 case Opt_res_all_tg_pt:
1666                         ret = match_int(args, &arg);
1667                         if (ret)
1668                                 goto out;
1669                         all_tg_pt = (int)arg;
1670                         break;
1671                 case Opt_mapped_lun:
1672                         ret = match_int(args, &arg);
1673                         if (ret)
1674                                 goto out;
1675                         mapped_lun = (u64)arg;
1676                         break;
1677                 /*
1678                  * PR APTPL Metadata for Target Port
1679                  */
1680                 case Opt_target_fabric:
1681                         t_fabric = match_strdup(args);
1682                         if (!t_fabric) {
1683                                 ret = -ENOMEM;
1684                                 goto out;
1685                         }
1686                         break;
1687                 case Opt_target_node:
1688                         t_port = match_strdup(args);
1689                         if (!t_port) {
1690                                 ret = -ENOMEM;
1691                                 goto out;
1692                         }
1693                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1694                                 pr_err("APTPL metadata target_node="
1695                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1696                                         PR_APTPL_MAX_TPORT_LEN);
1697                                 ret = -EINVAL;
1698                                 break;
1699                         }
1700                         break;
1701                 case Opt_tpgt:
1702                         ret = match_int(args, &arg);
1703                         if (ret)
1704                                 goto out;
1705                         tpgt = (u16)arg;
1706                         break;
1707                 case Opt_port_rtpi:
1708                         ret = match_int(args, &arg);
1709                         if (ret)
1710                                 goto out;
1711                         break;
1712                 case Opt_target_lun:
1713                         ret = match_int(args, &arg);
1714                         if (ret)
1715                                 goto out;
1716                         target_lun = (u64)arg;
1717                         break;
1718                 default:
1719                         break;
1720                 }
1721         }
1722
1723         if (!i_port || !t_port || !sa_res_key) {
1724                 pr_err("Illegal parameters for APTPL registration\n");
1725                 ret = -EINVAL;
1726                 goto out;
1727         }
1728
1729         if (res_holder && !(type)) {
1730                 pr_err("Illegal PR type: 0x%02x for reservation"
1731                                 " holder\n", type);
1732                 ret = -EINVAL;
1733                 goto out;
1734         }
1735
1736         ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
1737                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1738                         res_holder, all_tg_pt, type);
1739 out:
1740         kfree(i_fabric);
1741         kfree(i_port);
1742         kfree(isid);
1743         kfree(t_fabric);
1744         kfree(t_port);
1745         kfree(orig);
1746         return (ret == 0) ? count : ret;
1747 }
1748
1749
1750 CONFIGFS_ATTR_RO(target_pr_, res_holder);
1751 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
1752 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
1753 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
1754 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
1755 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
1756 CONFIGFS_ATTR_RO(target_pr_, res_type);
1757 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
1758 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
1759
1760 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1761         &target_pr_attr_res_holder,
1762         &target_pr_attr_res_pr_all_tgt_pts,
1763         &target_pr_attr_res_pr_generation,
1764         &target_pr_attr_res_pr_holder_tg_port,
1765         &target_pr_attr_res_pr_registered_i_pts,
1766         &target_pr_attr_res_pr_type,
1767         &target_pr_attr_res_type,
1768         &target_pr_attr_res_aptpl_active,
1769         &target_pr_attr_res_aptpl_metadata,
1770         NULL,
1771 };
1772
1773 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
1774
1775 /*  End functions for struct config_item_type tb_dev_pr_cit */
1776
1777 /*  Start functions for struct config_item_type tb_dev_cit */
1778
1779 static inline struct se_device *to_device(struct config_item *item)
1780 {
1781         return container_of(to_config_group(item), struct se_device, dev_group);
1782 }
1783
1784 static ssize_t target_dev_info_show(struct config_item *item, char *page)
1785 {
1786         struct se_device *dev = to_device(item);
1787         int bl = 0;
1788         ssize_t read_bytes = 0;
1789
1790         transport_dump_dev_state(dev, page, &bl);
1791         read_bytes += bl;
1792         read_bytes += dev->transport->show_configfs_dev_params(dev,
1793                         page+read_bytes);
1794         return read_bytes;
1795 }
1796
1797 static ssize_t target_dev_control_store(struct config_item *item,
1798                 const char *page, size_t count)
1799 {
1800         struct se_device *dev = to_device(item);
1801
1802         return dev->transport->set_configfs_dev_params(dev, page, count);
1803 }
1804
1805 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
1806 {
1807         struct se_device *dev = to_device(item);
1808
1809         if (!(dev->dev_flags & DF_USING_ALIAS))
1810                 return 0;
1811
1812         return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
1813 }
1814
1815 static ssize_t target_dev_alias_store(struct config_item *item,
1816                 const char *page, size_t count)
1817 {
1818         struct se_device *dev = to_device(item);
1819         struct se_hba *hba = dev->se_hba;
1820         ssize_t read_bytes;
1821
1822         if (count > (SE_DEV_ALIAS_LEN-1)) {
1823                 pr_err("alias count: %d exceeds"
1824                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1825                         SE_DEV_ALIAS_LEN-1);
1826                 return -EINVAL;
1827         }
1828
1829         read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
1830         if (!read_bytes)
1831                 return -EINVAL;
1832         if (dev->dev_alias[read_bytes - 1] == '\n')
1833                 dev->dev_alias[read_bytes - 1] = '\0';
1834
1835         dev->dev_flags |= DF_USING_ALIAS;
1836
1837         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1838                 config_item_name(&hba->hba_group.cg_item),
1839                 config_item_name(&dev->dev_group.cg_item),
1840                 dev->dev_alias);
1841
1842         return read_bytes;
1843 }
1844
1845 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
1846 {
1847         struct se_device *dev = to_device(item);
1848
1849         if (!(dev->dev_flags & DF_USING_UDEV_PATH))
1850                 return 0;
1851
1852         return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
1853 }
1854
1855 static ssize_t target_dev_udev_path_store(struct config_item *item,
1856                 const char *page, size_t count)
1857 {
1858         struct se_device *dev = to_device(item);
1859         struct se_hba *hba = dev->se_hba;
1860         ssize_t read_bytes;
1861
1862         if (count > (SE_UDEV_PATH_LEN-1)) {
1863                 pr_err("udev_path count: %d exceeds"
1864                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1865                         SE_UDEV_PATH_LEN-1);
1866                 return -EINVAL;
1867         }
1868
1869         read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
1870                         "%s", page);
1871         if (!read_bytes)
1872                 return -EINVAL;
1873         if (dev->udev_path[read_bytes - 1] == '\n')
1874                 dev->udev_path[read_bytes - 1] = '\0';
1875
1876         dev->dev_flags |= DF_USING_UDEV_PATH;
1877
1878         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1879                 config_item_name(&hba->hba_group.cg_item),
1880                 config_item_name(&dev->dev_group.cg_item),
1881                 dev->udev_path);
1882
1883         return read_bytes;
1884 }
1885
1886 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
1887 {
1888         struct se_device *dev = to_device(item);
1889
1890         return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
1891 }
1892
1893 static ssize_t target_dev_enable_store(struct config_item *item,
1894                 const char *page, size_t count)
1895 {
1896         struct se_device *dev = to_device(item);
1897         char *ptr;
1898         int ret;
1899
1900         ptr = strstr(page, "1");
1901         if (!ptr) {
1902                 pr_err("For dev_enable ops, only valid value"
1903                                 " is \"1\"\n");
1904                 return -EINVAL;
1905         }
1906
1907         ret = target_configure_device(dev);
1908         if (ret)
1909                 return ret;
1910         return count;
1911 }
1912
1913 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
1914 {
1915         struct se_device *dev = to_device(item);
1916         struct config_item *lu_ci;
1917         struct t10_alua_lu_gp *lu_gp;
1918         struct t10_alua_lu_gp_member *lu_gp_mem;
1919         ssize_t len = 0;
1920
1921         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1922         if (!lu_gp_mem)
1923                 return 0;
1924
1925         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1926         lu_gp = lu_gp_mem->lu_gp;
1927         if (lu_gp) {
1928                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1929                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1930                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1931         }
1932         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1933
1934         return len;
1935 }
1936
1937 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
1938                 const char *page, size_t count)
1939 {
1940         struct se_device *dev = to_device(item);
1941         struct se_hba *hba = dev->se_hba;
1942         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
1943         struct t10_alua_lu_gp_member *lu_gp_mem;
1944         unsigned char buf[LU_GROUP_NAME_BUF];
1945         int move = 0;
1946
1947         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1948         if (!lu_gp_mem)
1949                 return count;
1950
1951         if (count > LU_GROUP_NAME_BUF) {
1952                 pr_err("ALUA LU Group Alias too large!\n");
1953                 return -EINVAL;
1954         }
1955         memset(buf, 0, LU_GROUP_NAME_BUF);
1956         memcpy(buf, page, count);
1957         /*
1958          * Any ALUA logical unit alias besides "NULL" means we will be
1959          * making a new group association.
1960          */
1961         if (strcmp(strstrip(buf), "NULL")) {
1962                 /*
1963                  * core_alua_get_lu_gp_by_name() will increment reference to
1964                  * struct t10_alua_lu_gp.  This reference is released with
1965                  * core_alua_get_lu_gp_by_name below().
1966                  */
1967                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
1968                 if (!lu_gp_new)
1969                         return -ENODEV;
1970         }
1971
1972         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1973         lu_gp = lu_gp_mem->lu_gp;
1974         if (lu_gp) {
1975                 /*
1976                  * Clearing an existing lu_gp association, and replacing
1977                  * with NULL
1978                  */
1979                 if (!lu_gp_new) {
1980                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
1981                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
1982                                 " %hu\n",
1983                                 config_item_name(&hba->hba_group.cg_item),
1984                                 config_item_name(&dev->dev_group.cg_item),
1985                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
1986                                 lu_gp->lu_gp_id);
1987
1988                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1989                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1990
1991                         return count;
1992                 }
1993                 /*
1994                  * Removing existing association of lu_gp_mem with lu_gp
1995                  */
1996                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1997                 move = 1;
1998         }
1999         /*
2000          * Associate lu_gp_mem with lu_gp_new.
2001          */
2002         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2003         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2004
2005         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2006                 " core/alua/lu_gps/%s, ID: %hu\n",
2007                 (move) ? "Moving" : "Adding",
2008                 config_item_name(&hba->hba_group.cg_item),
2009                 config_item_name(&dev->dev_group.cg_item),
2010                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2011                 lu_gp_new->lu_gp_id);
2012
2013         core_alua_put_lu_gp_from_name(lu_gp_new);
2014         return count;
2015 }
2016
2017 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2018 {
2019         struct se_device *dev = to_device(item);
2020         struct t10_alua_lba_map *map;
2021         struct t10_alua_lba_map_member *mem;
2022         char *b = page;
2023         int bl = 0;
2024         char state;
2025
2026         spin_lock(&dev->t10_alua.lba_map_lock);
2027         if (!list_empty(&dev->t10_alua.lba_map_list))
2028             bl += sprintf(b + bl, "%u %u\n",
2029                           dev->t10_alua.lba_map_segment_size,
2030                           dev->t10_alua.lba_map_segment_multiplier);
2031         list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2032                 bl += sprintf(b + bl, "%llu %llu",
2033                               map->lba_map_first_lba, map->lba_map_last_lba);
2034                 list_for_each_entry(mem, &map->lba_map_mem_list,
2035                                     lba_map_mem_list) {
2036                         switch (mem->lba_map_mem_alua_state) {
2037                         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2038                                 state = 'O';
2039                                 break;
2040                         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2041                                 state = 'A';
2042                                 break;
2043                         case ALUA_ACCESS_STATE_STANDBY:
2044                                 state = 'S';
2045                                 break;
2046                         case ALUA_ACCESS_STATE_UNAVAILABLE:
2047                                 state = 'U';
2048                                 break;
2049                         default:
2050                                 state = '.';
2051                                 break;
2052                         }
2053                         bl += sprintf(b + bl, " %d:%c",
2054                                       mem->lba_map_mem_alua_pg_id, state);
2055                 }
2056                 bl += sprintf(b + bl, "\n");
2057         }
2058         spin_unlock(&dev->t10_alua.lba_map_lock);
2059         return bl;
2060 }
2061
2062 static ssize_t target_dev_lba_map_store(struct config_item *item,
2063                 const char *page, size_t count)
2064 {
2065         struct se_device *dev = to_device(item);
2066         struct t10_alua_lba_map *lba_map = NULL;
2067         struct list_head lba_list;
2068         char *map_entries, *orig, *ptr;
2069         char state;
2070         int pg_num = -1, pg;
2071         int ret = 0, num = 0, pg_id, alua_state;
2072         unsigned long start_lba = -1, end_lba = -1;
2073         unsigned long segment_size = -1, segment_mult = -1;
2074
2075         orig = map_entries = kstrdup(page, GFP_KERNEL);
2076         if (!map_entries)
2077                 return -ENOMEM;
2078
2079         INIT_LIST_HEAD(&lba_list);
2080         while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2081                 if (!*ptr)
2082                         continue;
2083
2084                 if (num == 0) {
2085                         if (sscanf(ptr, "%lu %lu\n",
2086                                    &segment_size, &segment_mult) != 2) {
2087                                 pr_err("Invalid line %d\n", num);
2088                                 ret = -EINVAL;
2089                                 break;
2090                         }
2091                         num++;
2092                         continue;
2093                 }
2094                 if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2095                         pr_err("Invalid line %d\n", num);
2096                         ret = -EINVAL;
2097                         break;
2098                 }
2099                 ptr = strchr(ptr, ' ');
2100                 if (!ptr) {
2101                         pr_err("Invalid line %d, missing end lba\n", num);
2102                         ret = -EINVAL;
2103                         break;
2104                 }
2105                 ptr++;
2106                 ptr = strchr(ptr, ' ');
2107                 if (!ptr) {
2108                         pr_err("Invalid line %d, missing state definitions\n",
2109                                num);
2110                         ret = -EINVAL;
2111                         break;
2112                 }
2113                 ptr++;
2114                 lba_map = core_alua_allocate_lba_map(&lba_list,
2115                                                      start_lba, end_lba);
2116                 if (IS_ERR(lba_map)) {
2117                         ret = PTR_ERR(lba_map);
2118                         break;
2119                 }
2120                 pg = 0;
2121                 while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2122                         switch (state) {
2123                         case 'O':
2124                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2125                                 break;
2126                         case 'A':
2127                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2128                                 break;
2129                         case 'S':
2130                                 alua_state = ALUA_ACCESS_STATE_STANDBY;
2131                                 break;
2132                         case 'U':
2133                                 alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2134                                 break;
2135                         default:
2136                                 pr_err("Invalid ALUA state '%c'\n", state);
2137                                 ret = -EINVAL;
2138                                 goto out;
2139                         }
2140
2141                         ret = core_alua_allocate_lba_map_mem(lba_map,
2142                                                              pg_id, alua_state);
2143                         if (ret) {
2144                                 pr_err("Invalid target descriptor %d:%c "
2145                                        "at line %d\n",
2146                                        pg_id, state, num);
2147                                 break;
2148                         }
2149                         pg++;
2150                         ptr = strchr(ptr, ' ');
2151                         if (ptr)
2152                                 ptr++;
2153                         else
2154                                 break;
2155                 }
2156                 if (pg_num == -1)
2157                     pg_num = pg;
2158                 else if (pg != pg_num) {
2159                         pr_err("Only %d from %d port groups definitions "
2160                                "at line %d\n", pg, pg_num, num);
2161                         ret = -EINVAL;
2162                         break;
2163                 }
2164                 num++;
2165         }
2166 out:
2167         if (ret) {
2168                 core_alua_free_lba_map(&lba_list);
2169                 count = ret;
2170         } else
2171                 core_alua_set_lba_map(dev, &lba_list,
2172                                       segment_size, segment_mult);
2173         kfree(orig);
2174         return count;
2175 }
2176
2177 CONFIGFS_ATTR_RO(target_dev_, info);
2178 CONFIGFS_ATTR_WO(target_dev_, control);
2179 CONFIGFS_ATTR(target_dev_, alias);
2180 CONFIGFS_ATTR(target_dev_, udev_path);
2181 CONFIGFS_ATTR(target_dev_, enable);
2182 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2183 CONFIGFS_ATTR(target_dev_, lba_map);
2184
2185 static struct configfs_attribute *target_core_dev_attrs[] = {
2186         &target_dev_attr_info,
2187         &target_dev_attr_control,
2188         &target_dev_attr_alias,
2189         &target_dev_attr_udev_path,
2190         &target_dev_attr_enable,
2191         &target_dev_attr_alua_lu_gp,
2192         &target_dev_attr_lba_map,
2193         NULL,
2194 };
2195
2196 static void target_core_dev_release(struct config_item *item)
2197 {
2198         struct config_group *dev_cg = to_config_group(item);
2199         struct se_device *dev =
2200                 container_of(dev_cg, struct se_device, dev_group);
2201
2202         target_free_device(dev);
2203 }
2204
2205 static struct configfs_item_operations target_core_dev_item_ops = {
2206         .release                = target_core_dev_release,
2207 };
2208
2209 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2210
2211 /* End functions for struct config_item_type tb_dev_cit */
2212
2213 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2214
2215 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2216 {
2217         return container_of(to_config_group(item), struct t10_alua_lu_gp,
2218                         lu_gp_group);
2219 }
2220
2221 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2222 {
2223         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2224
2225         if (!lu_gp->lu_gp_valid_id)
2226                 return 0;
2227         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2228 }
2229
2230 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2231                 const char *page, size_t count)
2232 {
2233         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2234         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2235         unsigned long lu_gp_id;
2236         int ret;
2237
2238         ret = kstrtoul(page, 0, &lu_gp_id);
2239         if (ret < 0) {
2240                 pr_err("kstrtoul() returned %d for"
2241                         " lu_gp_id\n", ret);
2242                 return ret;
2243         }
2244         if (lu_gp_id > 0x0000ffff) {
2245                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2246                         " 0x0000ffff\n", lu_gp_id);
2247                 return -EINVAL;
2248         }
2249
2250         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2251         if (ret < 0)
2252                 return -EINVAL;
2253
2254         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2255                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2256                 config_item_name(&alua_lu_gp_cg->cg_item),
2257                 lu_gp->lu_gp_id);
2258
2259         return count;
2260 }
2261
2262 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2263 {
2264         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2265         struct se_device *dev;
2266         struct se_hba *hba;
2267         struct t10_alua_lu_gp_member *lu_gp_mem;
2268         ssize_t len = 0, cur_len;
2269         unsigned char buf[LU_GROUP_NAME_BUF];
2270
2271         memset(buf, 0, LU_GROUP_NAME_BUF);
2272
2273         spin_lock(&lu_gp->lu_gp_lock);
2274         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2275                 dev = lu_gp_mem->lu_gp_mem_dev;
2276                 hba = dev->se_hba;
2277
2278                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2279                         config_item_name(&hba->hba_group.cg_item),
2280                         config_item_name(&dev->dev_group.cg_item));
2281                 cur_len++; /* Extra byte for NULL terminator */
2282
2283                 if ((cur_len + len) > PAGE_SIZE) {
2284                         pr_warn("Ran out of lu_gp_show_attr"
2285                                 "_members buffer\n");
2286                         break;
2287                 }
2288                 memcpy(page+len, buf, cur_len);
2289                 len += cur_len;
2290         }
2291         spin_unlock(&lu_gp->lu_gp_lock);
2292
2293         return len;
2294 }
2295
2296 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2297 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2298
2299 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2300         &target_lu_gp_attr_lu_gp_id,
2301         &target_lu_gp_attr_members,
2302         NULL,
2303 };
2304
2305 static void target_core_alua_lu_gp_release(struct config_item *item)
2306 {
2307         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2308                         struct t10_alua_lu_gp, lu_gp_group);
2309
2310         core_alua_free_lu_gp(lu_gp);
2311 }
2312
2313 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2314         .release                = target_core_alua_lu_gp_release,
2315 };
2316
2317 static struct config_item_type target_core_alua_lu_gp_cit = {
2318         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2319         .ct_attrs               = target_core_alua_lu_gp_attrs,
2320         .ct_owner               = THIS_MODULE,
2321 };
2322
2323 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2324
2325 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2326
2327 static struct config_group *target_core_alua_create_lu_gp(
2328         struct config_group *group,
2329         const char *name)
2330 {
2331         struct t10_alua_lu_gp *lu_gp;
2332         struct config_group *alua_lu_gp_cg = NULL;
2333         struct config_item *alua_lu_gp_ci = NULL;
2334
2335         lu_gp = core_alua_allocate_lu_gp(name, 0);
2336         if (IS_ERR(lu_gp))
2337                 return NULL;
2338
2339         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2340         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2341
2342         config_group_init_type_name(alua_lu_gp_cg, name,
2343                         &target_core_alua_lu_gp_cit);
2344
2345         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2346                 " Group: core/alua/lu_gps/%s\n",
2347                 config_item_name(alua_lu_gp_ci));
2348
2349         return alua_lu_gp_cg;
2350
2351 }
2352
2353 static void target_core_alua_drop_lu_gp(
2354         struct config_group *group,
2355         struct config_item *item)
2356 {
2357         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2358                         struct t10_alua_lu_gp, lu_gp_group);
2359
2360         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2361                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2362                 config_item_name(item), lu_gp->lu_gp_id);
2363         /*
2364          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2365          * -> target_core_alua_lu_gp_release()
2366          */
2367         config_item_put(item);
2368 }
2369
2370 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2371         .make_group             = &target_core_alua_create_lu_gp,
2372         .drop_item              = &target_core_alua_drop_lu_gp,
2373 };
2374
2375 static struct config_item_type target_core_alua_lu_gps_cit = {
2376         .ct_item_ops            = NULL,
2377         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2378         .ct_owner               = THIS_MODULE,
2379 };
2380
2381 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2382
2383 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2384
2385 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2386 {
2387         return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2388                         tg_pt_gp_group);
2389 }
2390
2391 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2392                 char *page)
2393 {
2394         return sprintf(page, "%d\n",
2395                        to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2396 }
2397
2398 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2399                 const char *page, size_t count)
2400 {
2401         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2402         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2403         unsigned long tmp;
2404         int new_state, ret;
2405
2406         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2407                 pr_err("Unable to do implicit ALUA on non valid"
2408                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2409                 return -EINVAL;
2410         }
2411         if (!(dev->dev_flags & DF_CONFIGURED)) {
2412                 pr_err("Unable to set alua_access_state while device is"
2413                        " not configured\n");
2414                 return -ENODEV;
2415         }
2416
2417         ret = kstrtoul(page, 0, &tmp);
2418         if (ret < 0) {
2419                 pr_err("Unable to extract new ALUA access state from"
2420                                 " %s\n", page);
2421                 return ret;
2422         }
2423         new_state = (int)tmp;
2424
2425         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2426                 pr_err("Unable to process implicit configfs ALUA"
2427                         " transition while TPGS_IMPLICIT_ALUA is disabled\n");
2428                 return -EINVAL;
2429         }
2430         if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2431             new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2432                 /* LBA DEPENDENT is only allowed with implicit ALUA */
2433                 pr_err("Unable to process implicit configfs ALUA transition"
2434                        " while explicit ALUA management is enabled\n");
2435                 return -EINVAL;
2436         }
2437
2438         ret = core_alua_do_port_transition(tg_pt_gp, dev,
2439                                         NULL, NULL, new_state, 0);
2440         return (!ret) ? count : -EINVAL;
2441 }
2442
2443 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2444                 char *page)
2445 {
2446         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2447         return sprintf(page, "%s\n",
2448                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2449 }
2450
2451 static ssize_t target_tg_pt_gp_alua_access_status_store(
2452                 struct config_item *item, const char *page, size_t count)
2453 {
2454         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2455         unsigned long tmp;
2456         int new_status, ret;
2457
2458         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2459                 pr_err("Unable to do set ALUA access status on non"
2460                         " valid tg_pt_gp ID: %hu\n",
2461                         tg_pt_gp->tg_pt_gp_valid_id);
2462                 return -EINVAL;
2463         }
2464
2465         ret = kstrtoul(page, 0, &tmp);
2466         if (ret < 0) {
2467                 pr_err("Unable to extract new ALUA access status"
2468                                 " from %s\n", page);
2469                 return ret;
2470         }
2471         new_status = (int)tmp;
2472
2473         if ((new_status != ALUA_STATUS_NONE) &&
2474             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2475             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2476                 pr_err("Illegal ALUA access status: 0x%02x\n",
2477                                 new_status);
2478                 return -EINVAL;
2479         }
2480
2481         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2482         return count;
2483 }
2484
2485 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2486                 char *page)
2487 {
2488         return core_alua_show_access_type(to_tg_pt_gp(item), page);
2489 }
2490
2491 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2492                 const char *page, size_t count)
2493 {
2494         return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2495 }
2496
2497 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
2498 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
2499                 struct config_item *item, char *p)                      \
2500 {                                                                       \
2501         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2502         return sprintf(p, "%d\n",                                       \
2503                 !!(t->tg_pt_gp_alua_supported_states & _bit));          \
2504 }                                                                       \
2505                                                                         \
2506 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
2507                 struct config_item *item, const char *p, size_t c)      \
2508 {                                                                       \
2509         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2510         unsigned long tmp;                                              \
2511         int ret;                                                        \
2512                                                                         \
2513         if (!t->tg_pt_gp_valid_id) {                                    \
2514                 pr_err("Unable to do set ##_name ALUA state on non"     \
2515                        " valid tg_pt_gp ID: %hu\n",                     \
2516                        t->tg_pt_gp_valid_id);                           \
2517                 return -EINVAL;                                         \
2518         }                                                               \
2519                                                                         \
2520         ret = kstrtoul(p, 0, &tmp);                                     \
2521         if (ret < 0) {                                                  \
2522                 pr_err("Invalid value '%s', must be '0' or '1'\n", p);  \
2523                 return -EINVAL;                                         \
2524         }                                                               \
2525         if (tmp > 1) {                                                  \
2526                 pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2527                 return -EINVAL;                                         \
2528         }                                                               \
2529         if (tmp)                                                        \
2530                 t->tg_pt_gp_alua_supported_states |= _bit;              \
2531         else                                                            \
2532                 t->tg_pt_gp_alua_supported_states &= ~_bit;             \
2533                                                                         \
2534         return c;                                                       \
2535 }
2536
2537 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2538 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2539 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2540 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2541 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2542 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2543 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2544
2545 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2546                 struct config_item *item, char *page)
2547 {
2548         return sprintf(page, "%d\n",
2549                 to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2550 }
2551
2552 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2553                 struct config_item *item, const char *page, size_t count)
2554 {
2555         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2556         unsigned long tmp;
2557         int ret;
2558
2559         ret = kstrtoul(page, 0, &tmp);
2560         if (ret < 0) {
2561                 pr_err("Unable to extract alua_write_metadata\n");
2562                 return ret;
2563         }
2564
2565         if ((tmp != 0) && (tmp != 1)) {
2566                 pr_err("Illegal value for alua_write_metadata:"
2567                         " %lu\n", tmp);
2568                 return -EINVAL;
2569         }
2570         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2571
2572         return count;
2573 }
2574
2575 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2576                 char *page)
2577 {
2578         return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2579 }
2580
2581 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2582                 const char *page, size_t count)
2583 {
2584         return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2585                         count);
2586 }
2587
2588 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2589                 char *page)
2590 {
2591         return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2592 }
2593
2594 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
2595                 const char *page, size_t count)
2596 {
2597         return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
2598                         count);
2599 }
2600
2601 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
2602                 struct config_item *item, char *page)
2603 {
2604         return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
2605 }
2606
2607 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
2608                 struct config_item *item, const char *page, size_t count)
2609 {
2610         return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
2611                         count);
2612 }
2613
2614 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
2615                 char *page)
2616 {
2617         return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
2618 }
2619
2620 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
2621                 const char *page, size_t count)
2622 {
2623         return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
2624 }
2625
2626 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
2627                 char *page)
2628 {
2629         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2630
2631         if (!tg_pt_gp->tg_pt_gp_valid_id)
2632                 return 0;
2633         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2634 }
2635
2636 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
2637                 const char *page, size_t count)
2638 {
2639         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2640         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2641         unsigned long tg_pt_gp_id;
2642         int ret;
2643
2644         ret = kstrtoul(page, 0, &tg_pt_gp_id);
2645         if (ret < 0) {
2646                 pr_err("kstrtoul() returned %d for"
2647                         " tg_pt_gp_id\n", ret);
2648                 return ret;
2649         }
2650         if (tg_pt_gp_id > 0x0000ffff) {
2651                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
2652                         " 0x0000ffff\n", tg_pt_gp_id);
2653                 return -EINVAL;
2654         }
2655
2656         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2657         if (ret < 0)
2658                 return -EINVAL;
2659
2660         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2661                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2662                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2663                 tg_pt_gp->tg_pt_gp_id);
2664
2665         return count;
2666 }
2667
2668 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
2669                 char *page)
2670 {
2671         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2672         struct se_lun *lun;
2673         ssize_t len = 0, cur_len;
2674         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2675
2676         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2677
2678         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2679         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
2680                         lun_tg_pt_gp_link) {
2681                 struct se_portal_group *tpg = lun->lun_tpg;
2682
2683                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2684                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2685                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2686                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2687                         config_item_name(&lun->lun_group.cg_item));
2688                 cur_len++; /* Extra byte for NULL terminator */
2689
2690                 if ((cur_len + len) > PAGE_SIZE) {
2691                         pr_warn("Ran out of lu_gp_show_attr"
2692                                 "_members buffer\n");
2693                         break;
2694                 }
2695                 memcpy(page+len, buf, cur_len);
2696                 len += cur_len;
2697         }
2698         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2699
2700         return len;
2701 }
2702
2703 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
2704 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
2705 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
2706 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
2707 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
2708 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
2709 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
2710 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
2711 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
2712 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
2713 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
2714 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
2715 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
2716 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
2717 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
2718 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
2719 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
2720
2721 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2722         &target_tg_pt_gp_attr_alua_access_state,
2723         &target_tg_pt_gp_attr_alua_access_status,
2724         &target_tg_pt_gp_attr_alua_access_type,
2725         &target_tg_pt_gp_attr_alua_support_transitioning,
2726         &target_tg_pt_gp_attr_alua_support_offline,
2727         &target_tg_pt_gp_attr_alua_support_lba_dependent,
2728         &target_tg_pt_gp_attr_alua_support_unavailable,
2729         &target_tg_pt_gp_attr_alua_support_standby,
2730         &target_tg_pt_gp_attr_alua_support_active_nonoptimized,
2731         &target_tg_pt_gp_attr_alua_support_active_optimized,
2732         &target_tg_pt_gp_attr_alua_write_metadata,
2733         &target_tg_pt_gp_attr_nonop_delay_msecs,
2734         &target_tg_pt_gp_attr_trans_delay_msecs,
2735         &target_tg_pt_gp_attr_implicit_trans_secs,
2736         &target_tg_pt_gp_attr_preferred,
2737         &target_tg_pt_gp_attr_tg_pt_gp_id,
2738         &target_tg_pt_gp_attr_members,
2739         NULL,
2740 };
2741
2742 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2743 {
2744         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2745                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2746
2747         core_alua_free_tg_pt_gp(tg_pt_gp);
2748 }
2749
2750 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2751         .release                = target_core_alua_tg_pt_gp_release,
2752 };
2753
2754 static struct config_item_type target_core_alua_tg_pt_gp_cit = {
2755         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2756         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2757         .ct_owner               = THIS_MODULE,
2758 };
2759
2760 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2761
2762 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2763
2764 static struct config_group *target_core_alua_create_tg_pt_gp(
2765         struct config_group *group,
2766         const char *name)
2767 {
2768         struct t10_alua *alua = container_of(group, struct t10_alua,
2769                                         alua_tg_pt_gps_group);
2770         struct t10_alua_tg_pt_gp *tg_pt_gp;
2771         struct config_group *alua_tg_pt_gp_cg = NULL;
2772         struct config_item *alua_tg_pt_gp_ci = NULL;
2773
2774         tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
2775         if (!tg_pt_gp)
2776                 return NULL;
2777
2778         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2779         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2780
2781         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2782                         &target_core_alua_tg_pt_gp_cit);
2783
2784         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2785                 " Group: alua/tg_pt_gps/%s\n",
2786                 config_item_name(alua_tg_pt_gp_ci));
2787
2788         return alua_tg_pt_gp_cg;
2789 }
2790
2791 static void target_core_alua_drop_tg_pt_gp(
2792         struct config_group *group,
2793         struct config_item *item)
2794 {
2795         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2796                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2797
2798         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2799                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2800                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2801         /*
2802          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2803          * -> target_core_alua_tg_pt_gp_release().
2804          */
2805         config_item_put(item);
2806 }
2807
2808 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2809         .make_group             = &target_core_alua_create_tg_pt_gp,
2810         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2811 };
2812
2813 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
2814
2815 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2816
2817 /* Start functions for struct config_item_type target_core_alua_cit */
2818
2819 /*
2820  * target_core_alua_cit is a ConfigFS group that lives under
2821  * /sys/kernel/config/target/core/alua.  There are default groups
2822  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2823  * target_core_alua_cit in target_core_init_configfs() below.
2824  */
2825 static struct config_item_type target_core_alua_cit = {
2826         .ct_item_ops            = NULL,
2827         .ct_attrs               = NULL,
2828         .ct_owner               = THIS_MODULE,
2829 };
2830
2831 /* End functions for struct config_item_type target_core_alua_cit */
2832
2833 /* Start functions for struct config_item_type tb_dev_stat_cit */
2834
2835 static struct config_group *target_core_stat_mkdir(
2836         struct config_group *group,
2837         const char *name)
2838 {
2839         return ERR_PTR(-ENOSYS);
2840 }
2841
2842 static void target_core_stat_rmdir(
2843         struct config_group *group,
2844         struct config_item *item)
2845 {
2846         return;
2847 }
2848
2849 static struct configfs_group_operations target_core_stat_group_ops = {
2850         .make_group             = &target_core_stat_mkdir,
2851         .drop_item              = &target_core_stat_rmdir,
2852 };
2853
2854 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
2855
2856 /* End functions for struct config_item_type tb_dev_stat_cit */
2857
2858 /* Start functions for struct config_item_type target_core_hba_cit */
2859
2860 static struct config_group *target_core_make_subdev(
2861         struct config_group *group,
2862         const char *name)
2863 {
2864         struct t10_alua_tg_pt_gp *tg_pt_gp;
2865         struct config_item *hba_ci = &group->cg_item;
2866         struct se_hba *hba = item_to_hba(hba_ci);
2867         struct target_backend *tb = hba->backend;
2868         struct se_device *dev;
2869         int errno = -ENOMEM, ret;
2870
2871         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2872         if (ret)
2873                 return ERR_PTR(ret);
2874
2875         dev = target_alloc_device(hba, name);
2876         if (!dev)
2877                 goto out_unlock;
2878
2879         config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
2880
2881         config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
2882                         &tb->tb_dev_attrib_cit);
2883         configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
2884
2885         config_group_init_type_name(&dev->dev_pr_group, "pr",
2886                         &tb->tb_dev_pr_cit);
2887         configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
2888
2889         config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
2890                         &tb->tb_dev_wwn_cit);
2891         configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
2892                         &dev->dev_group);
2893
2894         config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
2895                         "alua", &tb->tb_dev_alua_tg_pt_gps_cit);
2896         configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
2897                         &dev->dev_group);
2898
2899         config_group_init_type_name(&dev->dev_stat_grps.stat_group,
2900                         "statistics", &tb->tb_dev_stat_cit);
2901         configfs_add_default_group(&dev->dev_stat_grps.stat_group,
2902                         &dev->dev_group);
2903
2904         /*
2905          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2906          */
2907         tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
2908         if (!tg_pt_gp)
2909                 goto out_free_device;
2910         dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2911
2912         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2913                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2914         configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
2915                         &dev->t10_alua.alua_tg_pt_gps_group);
2916
2917         /*
2918          * Add core/$HBA/$DEV/statistics/ default groups
2919          */
2920         target_stat_setup_dev_default_groups(dev);
2921
2922         mutex_unlock(&hba->hba_access_mutex);
2923         return &dev->dev_group;
2924
2925 out_free_device:
2926         target_free_device(dev);
2927 out_unlock:
2928         mutex_unlock(&hba->hba_access_mutex);
2929         return ERR_PTR(errno);
2930 }
2931
2932 static void target_core_drop_subdev(
2933         struct config_group *group,
2934         struct config_item *item)
2935 {
2936         struct config_group *dev_cg = to_config_group(item);
2937         struct se_device *dev =
2938                 container_of(dev_cg, struct se_device, dev_group);
2939         struct se_hba *hba;
2940
2941         hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
2942
2943         mutex_lock(&hba->hba_access_mutex);
2944
2945         configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
2946         configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
2947
2948         /*
2949          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
2950          * directly from target_core_alua_tg_pt_gp_release().
2951          */
2952         dev->t10_alua.default_tg_pt_gp = NULL;
2953
2954         configfs_remove_default_groups(dev_cg);
2955
2956         /*
2957          * se_dev is released from target_core_dev_item_ops->release()
2958          */
2959         config_item_put(item);
2960         mutex_unlock(&hba->hba_access_mutex);
2961 }
2962
2963 static struct configfs_group_operations target_core_hba_group_ops = {
2964         .make_group             = target_core_make_subdev,
2965         .drop_item              = target_core_drop_subdev,
2966 };
2967
2968
2969 static inline struct se_hba *to_hba(struct config_item *item)
2970 {
2971         return container_of(to_config_group(item), struct se_hba, hba_group);
2972 }
2973
2974 static ssize_t target_hba_info_show(struct config_item *item, char *page)
2975 {
2976         struct se_hba *hba = to_hba(item);
2977
2978         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
2979                         hba->hba_id, hba->backend->ops->name,
2980                         TARGET_CORE_VERSION);
2981 }
2982
2983 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
2984 {
2985         struct se_hba *hba = to_hba(item);
2986         int hba_mode = 0;
2987
2988         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
2989                 hba_mode = 1;
2990
2991         return sprintf(page, "%d\n", hba_mode);
2992 }
2993
2994 static ssize_t target_hba_mode_store(struct config_item *item,
2995                 const char *page, size_t count)
2996 {
2997         struct se_hba *hba = to_hba(item);
2998         unsigned long mode_flag;
2999         int ret;
3000
3001         if (hba->backend->ops->pmode_enable_hba == NULL)
3002                 return -EINVAL;
3003
3004         ret = kstrtoul(page, 0, &mode_flag);
3005         if (ret < 0) {
3006                 pr_err("Unable to extract hba mode flag: %d\n", ret);
3007                 return ret;
3008         }
3009
3010         if (hba->dev_count) {
3011                 pr_err("Unable to set hba_mode with active devices\n");
3012                 return -EINVAL;
3013         }
3014
3015         ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3016         if (ret < 0)
3017                 return -EINVAL;
3018         if (ret > 0)
3019                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3020         else if (ret == 0)
3021                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3022
3023         return count;
3024 }
3025
3026 CONFIGFS_ATTR_RO(target_, hba_info);
3027 CONFIGFS_ATTR(target_, hba_mode);
3028
3029 static void target_core_hba_release(struct config_item *item)
3030 {
3031         struct se_hba *hba = container_of(to_config_group(item),
3032                                 struct se_hba, hba_group);
3033         core_delete_hba(hba);
3034 }
3035
3036 static struct configfs_attribute *target_core_hba_attrs[] = {
3037         &target_attr_hba_info,
3038         &target_attr_hba_mode,
3039         NULL,
3040 };
3041
3042 static struct configfs_item_operations target_core_hba_item_ops = {
3043         .release                = target_core_hba_release,
3044 };
3045
3046 static struct config_item_type target_core_hba_cit = {
3047         .ct_item_ops            = &target_core_hba_item_ops,
3048         .ct_group_ops           = &target_core_hba_group_ops,
3049         .ct_attrs               = target_core_hba_attrs,
3050         .ct_owner               = THIS_MODULE,
3051 };
3052
3053 static struct config_group *target_core_call_addhbatotarget(
3054         struct config_group *group,
3055         const char *name)
3056 {
3057         char *se_plugin_str, *str, *str2;
3058         struct se_hba *hba;
3059         char buf[TARGET_CORE_NAME_MAX_LEN];
3060         unsigned long plugin_dep_id = 0;
3061         int ret;
3062
3063         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3064         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3065                 pr_err("Passed *name strlen(): %d exceeds"
3066                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3067                         TARGET_CORE_NAME_MAX_LEN);
3068                 return ERR_PTR(-ENAMETOOLONG);
3069         }
3070         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3071
3072         str = strstr(buf, "_");
3073         if (!str) {
3074                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3075                 return ERR_PTR(-EINVAL);
3076         }
3077         se_plugin_str = buf;
3078         /*
3079          * Special case for subsystem plugins that have "_" in their names.
3080          * Namely rd_direct and rd_mcp..
3081          */
3082         str2 = strstr(str+1, "_");
3083         if (str2) {
3084                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3085                 str2++; /* Skip to start of plugin dependent ID */
3086                 str = str2;
3087         } else {
3088                 *str = '\0'; /* Terminate for *se_plugin_str */
3089                 str++; /* Skip to start of plugin dependent ID */
3090         }
3091
3092         ret = kstrtoul(str, 0, &plugin_dep_id);
3093         if (ret < 0) {
3094                 pr_err("kstrtoul() returned %d for"
3095                                 " plugin_dep_id\n", ret);
3096                 return ERR_PTR(ret);
3097         }
3098         /*
3099          * Load up TCM subsystem plugins if they have not already been loaded.
3100          */
3101         transport_subsystem_check_init();
3102
3103         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3104         if (IS_ERR(hba))
3105                 return ERR_CAST(hba);
3106
3107         config_group_init_type_name(&hba->hba_group, name,
3108                         &target_core_hba_cit);
3109
3110         return &hba->hba_group;
3111 }
3112
3113 static void target_core_call_delhbafromtarget(
3114         struct config_group *group,
3115         struct config_item *item)
3116 {
3117         /*
3118          * core_delete_hba() is called from target_core_hba_item_ops->release()
3119          * -> target_core_hba_release()
3120          */
3121         config_item_put(item);
3122 }
3123
3124 static struct configfs_group_operations target_core_group_ops = {
3125         .make_group     = target_core_call_addhbatotarget,
3126         .drop_item      = target_core_call_delhbafromtarget,
3127 };
3128
3129 static struct config_item_type target_core_cit = {
3130         .ct_item_ops    = NULL,
3131         .ct_group_ops   = &target_core_group_ops,
3132         .ct_attrs       = NULL,
3133         .ct_owner       = THIS_MODULE,
3134 };
3135
3136 /* Stop functions for struct config_item_type target_core_hba_cit */
3137
3138 void target_setup_backend_cits(struct target_backend *tb)
3139 {
3140         target_core_setup_dev_cit(tb);
3141         target_core_setup_dev_attrib_cit(tb);
3142         target_core_setup_dev_pr_cit(tb);
3143         target_core_setup_dev_wwn_cit(tb);
3144         target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3145         target_core_setup_dev_stat_cit(tb);
3146 }
3147
3148 static int __init target_core_init_configfs(void)
3149 {
3150         struct configfs_subsystem *subsys = &target_core_fabrics;
3151         struct t10_alua_lu_gp *lu_gp;
3152         int ret;
3153
3154         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3155                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3156                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3157
3158         config_group_init(&subsys->su_group);
3159         mutex_init(&subsys->su_mutex);
3160
3161         ret = init_se_kmem_caches();
3162         if (ret < 0)
3163                 return ret;
3164         /*
3165          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3166          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3167          */
3168         config_group_init_type_name(&target_core_hbagroup, "core",
3169                         &target_core_cit);
3170         configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3171
3172         /*
3173          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3174          */
3175         config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3176         configfs_add_default_group(&alua_group, &target_core_hbagroup);
3177
3178         /*
3179          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3180          * groups under /sys/kernel/config/target/core/alua/
3181          */
3182         config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3183                         &target_core_alua_lu_gps_cit);
3184         configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3185
3186         /*
3187          * Add core/alua/lu_gps/default_lu_gp
3188          */
3189         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3190         if (IS_ERR(lu_gp)) {
3191                 ret = -ENOMEM;
3192                 goto out_global;
3193         }
3194
3195         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3196                                 &target_core_alua_lu_gp_cit);
3197         configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3198
3199         default_lu_gp = lu_gp;
3200
3201         /*
3202          * Register the target_core_mod subsystem with configfs.
3203          */
3204         ret = configfs_register_subsystem(subsys);
3205         if (ret < 0) {
3206                 pr_err("Error %d while registering subsystem %s\n",
3207                         ret, subsys->su_group.cg_item.ci_namebuf);
3208                 goto out_global;
3209         }
3210         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3211                 " Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3212                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3213         /*
3214          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3215          */
3216         ret = rd_module_init();
3217         if (ret < 0)
3218                 goto out;
3219
3220         ret = core_dev_setup_virtual_lun0();
3221         if (ret < 0)
3222                 goto out;
3223
3224         ret = target_xcopy_setup_pt();
3225         if (ret < 0)
3226                 goto out;
3227
3228         return 0;
3229
3230 out:
3231         configfs_unregister_subsystem(subsys);
3232         core_dev_release_virtual_lun0();
3233         rd_module_exit();
3234 out_global:
3235         if (default_lu_gp) {
3236                 core_alua_free_lu_gp(default_lu_gp);
3237                 default_lu_gp = NULL;
3238         }
3239         release_se_kmem_caches();
3240         return ret;
3241 }
3242
3243 static void __exit target_core_exit_configfs(void)
3244 {
3245         configfs_remove_default_groups(&alua_lu_gps_group);
3246         configfs_remove_default_groups(&alua_group);
3247         configfs_remove_default_groups(&target_core_hbagroup);
3248
3249         /*
3250          * We expect subsys->su_group.default_groups to be released
3251          * by configfs subsystem provider logic..
3252          */
3253         configfs_unregister_subsystem(&target_core_fabrics);
3254
3255         core_alua_free_lu_gp(default_lu_gp);
3256         default_lu_gp = NULL;
3257
3258         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3259                         " Infrastructure\n");
3260
3261         core_dev_release_virtual_lun0();
3262         rd_module_exit();
3263         target_xcopy_release_pt();
3264         release_se_kmem_caches();
3265 }
3266
3267 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3268 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3269 MODULE_LICENSE("GPL");
3270
3271 module_init(target_core_init_configfs);
3272 module_exit(target_core_exit_configfs);