drivers/target/target_core_configfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename:  target_core_configfs.c
   4  *
   5  * This file contains ConfigFS logic for the Generic Target Engine project.
   6  *
   7  * (c) Copyright 2008-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
  12  *
  13  ****************************************************************************/
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <generated/utsrelease.h>
  18 #include <linux/utsname.h>
  19 #include <linux/init.h>
  20 #include <linux/fs.h>
  21 #include <linux/namei.h>
  22 #include <linux/slab.h>
  23 #include <linux/types.h>
  24 #include <linux/delay.h>
  25 #include <linux/unistd.h>
  26 #include <linux/string.h>
  27 #include <linux/parser.h>
  28 #include <linux/syscalls.h>
  29 #include <linux/configfs.h>
  30 #include <linux/spinlock.h>
  31
  32 #include <target/target_core_base.h>
  33 #include <target/target_core_backend.h>
  34 #include <target/target_core_fabric.h>
  35
  36 #include "target_core_internal.h"
  37 #include "target_core_alua.h"
  38 #include "target_core_pr.h"
  39 #include "target_core_rd.h"
  40 #include "target_core_xcopy.h"
  41
  42 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
  43 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  44 {                                                                       \
  45         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  46                                                                         \
  47         cit->ct_item_ops = _item_ops;                                   \
  48         cit->ct_group_ops = _group_ops;                                 \
  49         cit->ct_attrs = _attrs;                                         \
  50         cit->ct_owner = tb->ops->owner;                                 \
  51         pr_debug("Setup generic %s\n", __stringify(_name));             \
  52 }
  53
  54 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)                  \
  55 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  56 {                                                                       \
  57         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  58                                                                         \
  59         cit->ct_item_ops = _item_ops;                                   \
  60         cit->ct_group_ops = _group_ops;                                 \
  61         cit->ct_attrs = tb->ops->tb_##_name##_attrs;                    \
  62         cit->ct_owner = tb->ops->owner;                                 \
  63         pr_debug("Setup generic %s\n", __stringify(_name));             \
  64 }
  65
  66 extern struct t10_alua_lu_gp *default_lu_gp;
  67
  68 static LIST_HEAD(g_tf_list);
  69 static DEFINE_MUTEX(g_tf_lock);
  70
  71 static struct config_group target_core_hbagroup;
  72 static struct config_group alua_group;
  73 static struct config_group alua_lu_gps_group;
  74
  75 static inline struct se_hba *
  76 item_to_hba(struct config_item *item)
  77 {
  78         return container_of(to_config_group(item), struct se_hba, hba_group);
  79 }
  80
  81 /*
  82  * Attributes for /sys/kernel/config/target/
  83  */
  84 static ssize_t target_core_item_version_show(struct config_item *item,
  85                 char *page)
  86 {
  87         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  88                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
  89                 utsname()->sysname, utsname()->machine);
  90 }
  91
  92 CONFIGFS_ATTR_RO(target_core_item_, version);
  93
  94 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
  95 static char db_root_stage[DB_ROOT_LEN];
  96
  97 static ssize_t target_core_item_dbroot_show(struct config_item *item,
  98                                             char *page)
  99 {
 100         return sprintf(page, "%s\n", db_root);
 101 }
 102
 103 static ssize_t target_core_item_dbroot_store(struct config_item *item,
 104                                         const char *page, size_t count)
 105 {
 106         ssize_t read_bytes;
 107         struct file *fp;
 108
 109         mutex_lock(&g_tf_lock);
 110         if (!list_empty(&g_tf_list)) {
 111                 mutex_unlock(&g_tf_lock);
 112                 pr_err("db_root: cannot be changed: target drivers registered");
 113                 return -EINVAL;
 114         }
 115
 116         if (count > (DB_ROOT_LEN - 1)) {
 117                 mutex_unlock(&g_tf_lock);
 118                 pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
 119                        (int)count, DB_ROOT_LEN - 1);
 120                 return -EINVAL;
 121         }
 122
 123         read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
 124         if (!read_bytes) {
 125                 mutex_unlock(&g_tf_lock);
 126                 return -EINVAL;
 127         }
 128         if (db_root_stage[read_bytes - 1] == '\n')
 129                 db_root_stage[read_bytes - 1] = '\0';
 130
 131         /* validate new db root before accepting it */
 132         fp = filp_open(db_root_stage, O_RDONLY, 0);
 133         if (IS_ERR(fp)) {
 134                 mutex_unlock(&g_tf_lock);
 135                 pr_err("db_root: cannot open: %s\n", db_root_stage);
 136                 return -EINVAL;
 137         }
 138         if (!S_ISDIR(file_inode(fp)->i_mode)) {
 139                 filp_close(fp, NULL);
 140                 mutex_unlock(&g_tf_lock);
 141                 pr_err("db_root: not a directory: %s\n", db_root_stage);
 142                 return -EINVAL;
 143         }
 144         filp_close(fp, NULL);
 145
 146         strncpy(db_root, db_root_stage, read_bytes);
 147
 148         mutex_unlock(&g_tf_lock);
 149
 150         pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
 151
 152         return read_bytes;
 153 }
 154
 155 CONFIGFS_ATTR(target_core_item_, dbroot);
 156
 157 static struct target_fabric_configfs *target_core_get_fabric(
 158         const char *name)
 159 {
 160         struct target_fabric_configfs *tf;
 161
 162         if (!name)
 163                 return NULL;
 164
 165         mutex_lock(&g_tf_lock);
 166         list_for_each_entry(tf, &g_tf_list, tf_list) {
 167                 const char *cmp_name = tf->tf_ops->fabric_alias;
 168                 if (!cmp_name)
 169                         cmp_name = tf->tf_ops->fabric_name;
 170                 if (!strcmp(cmp_name, name)) {
 171                         atomic_inc(&tf->tf_access_cnt);
 172                         mutex_unlock(&g_tf_lock);
 173                         return tf;
 174                 }
 175         }
 176         mutex_unlock(&g_tf_lock);
 177
 178         return NULL;
 179 }
 180
 181 /*
 182  * Called from struct target_core_group_ops->make_group()
 183  */
 184 static struct config_group *target_core_register_fabric(
 185         struct config_group *group,
 186         const char *name)
 187 {
 188         struct target_fabric_configfs *tf;
 189         int ret;
 190
 191         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 192                         " %s\n", group, name);
 193
 194         tf = target_core_get_fabric(name);
 195         if (!tf) {
 196                 pr_debug("target_core_register_fabric() trying autoload for %s\n",
 197                          name);
 198
 199                 /*
 200                  * Below are some hardcoded request_module() calls to automatically
 201                  * local fabric modules when the following is called:
 202                  *
 203                  * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 204                  *
 205                  * Note that this does not limit which TCM fabric module can be
 206                  * registered, but simply provids auto loading logic for modules with
 207                  * mkdir(2) system calls with known TCM fabric modules.
 208                  */
 209
 210                 if (!strncmp(name, "iscsi", 5)) {
 211                         /*
 212                          * Automatically load the LIO Target fabric module when the
 213                          * following is called:
 214                          *
 215                          * mkdir -p $CONFIGFS/target/iscsi
 216                          */
 217                         ret = request_module("iscsi_target_mod");
 218                         if (ret < 0) {
 219                                 pr_debug("request_module() failed for"
 220                                          " iscsi_target_mod.ko: %d\n", ret);
 221                                 return ERR_PTR(-EINVAL);
 222                         }
 223                 } else if (!strncmp(name, "loopback", 8)) {
 224                         /*
 225                          * Automatically load the tcm_loop fabric module when the
 226                          * following is called:
 227                          *
 228                          * mkdir -p $CONFIGFS/target/loopback
 229                          */
 230                         ret = request_module("tcm_loop");
 231                         if (ret < 0) {
 232                                 pr_debug("request_module() failed for"
 233                                          " tcm_loop.ko: %d\n", ret);
 234                                 return ERR_PTR(-EINVAL);
 235                         }
 236                 }
 237
 238                 tf = target_core_get_fabric(name);
 239         }
 240
 241         if (!tf) {
 242                 pr_debug("target_core_get_fabric() failed for %s\n",
 243                          name);
 244                 return ERR_PTR(-EINVAL);
 245         }
 246         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 247                         " %s\n", tf->tf_ops->fabric_name);
 248         /*
 249          * On a successful target_core_get_fabric() look, the returned
 250          * struct target_fabric_configfs *tf will contain a usage reference.
 251          */
 252         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 253                         &tf->tf_wwn_cit);
 254
 255         config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
 256
 257         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 258                         &tf->tf_discovery_cit);
 259         configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
 260
 261         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric: %s\n",
 262                  config_item_name(&tf->tf_group.cg_item));
 263         return &tf->tf_group;
 264 }
 265
 266 /*
 267  * Called from struct target_core_group_ops->drop_item()
 268  */
 269 static void target_core_deregister_fabric(
 270         struct config_group *group,
 271         struct config_item *item)
 272 {
 273         struct target_fabric_configfs *tf = container_of(
 274                 to_config_group(item), struct target_fabric_configfs, tf_group);
 275
 276         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 277                 " tf list\n", config_item_name(item));
 278
 279         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 280                         " %s\n", tf->tf_ops->fabric_name);
 281         atomic_dec(&tf->tf_access_cnt);
 282
 283         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 284                         " %s\n", config_item_name(item));
 285
 286         configfs_remove_default_groups(&tf->tf_group);
 287         config_item_put(item);
 288 }
 289
 290 static struct configfs_group_operations target_core_fabric_group_ops = {
 291         .make_group     = &target_core_register_fabric,
 292         .drop_item      = &target_core_deregister_fabric,
 293 };
 294
 295 /*
 296  * All item attributes appearing in /sys/kernel/target/ appear here.
 297  */
 298 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 299         &target_core_item_attr_version,
 300         &target_core_item_attr_dbroot,
 301         NULL,
 302 };
 303
 304 /*
 305  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 306  */
 307 static const struct config_item_type target_core_fabrics_item = {
 308         .ct_group_ops   = &target_core_fabric_group_ops,
 309         .ct_attrs       = target_core_fabric_item_attrs,
 310         .ct_owner       = THIS_MODULE,
 311 };
 312
 313 static struct configfs_subsystem target_core_fabrics = {
 314         .su_group = {
 315                 .cg_item = {
 316                         .ci_namebuf = "target",
 317                         .ci_type = &target_core_fabrics_item,
 318                 },
 319         },
 320 };
 321
 322 int target_depend_item(struct config_item *item)
 323 {
 324         return configfs_depend_item(&target_core_fabrics, item);
 325 }
 326 EXPORT_SYMBOL(target_depend_item);
 327
 328 void target_undepend_item(struct config_item *item)
 329 {
 330         return configfs_undepend_item(item);
 331 }
 332 EXPORT_SYMBOL(target_undepend_item);
 333
 334 /*##############################################################################
 335 // Start functions called by external Target Fabrics Modules
 336 //############################################################################*/
 337
 338 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 339 {
 340         if (tfo->fabric_alias) {
 341                 if (strlen(tfo->fabric_alias) >= TARGET_FABRIC_NAME_SIZE) {
 342                         pr_err("Passed alias: %s exceeds "
 343                                 "TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_alias);
 344                         return -EINVAL;
 345                 }
 346         }
 347         if (!tfo->fabric_name) {
 348                 pr_err("Missing tfo->fabric_name\n");
 349                 return -EINVAL;
 350         }
 351         if (strlen(tfo->fabric_name) >= TARGET_FABRIC_NAME_SIZE) {
 352                 pr_err("Passed name: %s exceeds "
 353                         "TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_name);
 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->set_default_node_attributes) {
 397                 pr_err("Missing tfo->set_default_node_attributes()\n");
 398                 return -EINVAL;
 399         }
 400         if (!tfo->get_cmd_state) {
 401                 pr_err("Missing tfo->get_cmd_state()\n");
 402                 return -EINVAL;
 403         }
 404         if (!tfo->queue_data_in) {
 405                 pr_err("Missing tfo->queue_data_in()\n");
 406                 return -EINVAL;
 407         }
 408         if (!tfo->queue_status) {
 409                 pr_err("Missing tfo->queue_status()\n");
 410                 return -EINVAL;
 411         }
 412         if (!tfo->queue_tm_rsp) {
 413                 pr_err("Missing tfo->queue_tm_rsp()\n");
 414                 return -EINVAL;
 415         }
 416         if (!tfo->aborted_task) {
 417                 pr_err("Missing tfo->aborted_task()\n");
 418                 return -EINVAL;
 419         }
 420         if (!tfo->check_stop_free) {
 421                 pr_err("Missing tfo->check_stop_free()\n");
 422                 return -EINVAL;
 423         }
 424         /*
 425          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 426          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 427          * target_core_fabric_configfs.c WWN+TPG group context code.
 428          */
 429         if (!tfo->fabric_make_wwn) {
 430                 pr_err("Missing tfo->fabric_make_wwn()\n");
 431                 return -EINVAL;
 432         }
 433         if (!tfo->fabric_drop_wwn) {
 434                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 435                 return -EINVAL;
 436         }
 437         if (!tfo->fabric_make_tpg) {
 438                 pr_err("Missing tfo->fabric_make_tpg()\n");
 439                 return -EINVAL;
 440         }
 441         if (!tfo->fabric_drop_tpg) {
 442                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 443                 return -EINVAL;
 444         }
 445
 446         return 0;
 447 }
 448
 449 int target_register_template(const struct target_core_fabric_ops *fo)
 450 {
 451         struct target_fabric_configfs *tf;
 452         int ret;
 453
 454         ret = target_fabric_tf_ops_check(fo);
 455         if (ret)
 456                 return ret;
 457
 458         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 459         if (!tf) {
 460                 pr_err("%s: could not allocate memory!\n", __func__);
 461                 return -ENOMEM;
 462         }
 463
 464         INIT_LIST_HEAD(&tf->tf_list);
 465         atomic_set(&tf->tf_access_cnt, 0);
 466         tf->tf_ops = fo;
 467         target_fabric_setup_cits(tf);
 468
 469         mutex_lock(&g_tf_lock);
 470         list_add_tail(&tf->tf_list, &g_tf_list);
 471         mutex_unlock(&g_tf_lock);
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(target_register_template);
 476
 477 void target_unregister_template(const struct target_core_fabric_ops *fo)
 478 {
 479         struct target_fabric_configfs *t;
 480
 481         mutex_lock(&g_tf_lock);
 482         list_for_each_entry(t, &g_tf_list, tf_list) {
 483                 if (!strcmp(t->tf_ops->fabric_name, fo->fabric_name)) {
 484                         BUG_ON(atomic_read(&t->tf_access_cnt));
 485                         list_del(&t->tf_list);
 486                         mutex_unlock(&g_tf_lock);
 487                         /*
 488                          * Wait for any outstanding fabric se_deve_entry->rcu_head
 489                          * callbacks to complete post kfree_rcu(), before allowing
 490                          * fabric driver unload of TFO->module to proceed.
 491                          */
 492                         rcu_barrier();
 493                         kfree(t);
 494                         return;
 495                 }
 496         }
 497         mutex_unlock(&g_tf_lock);
 498 }
 499 EXPORT_SYMBOL(target_unregister_template);
 500
 501 /*##############################################################################
 502 // Stop functions called by external Target Fabrics Modules
 503 //############################################################################*/
 504
 505 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
 506 {
 507         return container_of(to_config_group(item), struct se_dev_attrib,
 508                         da_group);
 509 }
 510
 511 /* Start functions for struct config_item_type tb_dev_attrib_cit */
 512 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
 513 static ssize_t _name##_show(struct config_item *item, char *page)       \
 514 {                                                                       \
 515         return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
 516 }
 517
 518 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
 519 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
 520 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
 521 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
 522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
 523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
 524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
 525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
 526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
 527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
 528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
 529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_pr);
 530 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
 531 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
 532 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
 533 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
 534 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
 535 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
 536 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
 537 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
 538 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
 539 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
 540 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
 541 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
 542 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
 543 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
 544 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
 545 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
 546 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
 547 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
 548 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
 549
 550 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
 551 static ssize_t _name##_store(struct config_item *item, const char *page,\
 552                 size_t count)                                           \
 553 {                                                                       \
 554         struct se_dev_attrib *da = to_attrib(item);                     \
 555         u32 val;                                                        \
 556         int ret;                                                        \
 557                                                                         \
 558         ret = kstrtou32(page, 0, &val);                                 \
 559         if (ret < 0)                                                    \
 560                 return ret;                                             \
 561         da->_name = val;                                                \
 562         return count;                                                   \
 563 }
 564
 565 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
 566 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
 567 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
 568 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
 569 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
 570
 571 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
 572 static ssize_t _name##_store(struct config_item *item, const char *page,        \
 573                 size_t count)                                           \
 574 {                                                                       \
 575         struct se_dev_attrib *da = to_attrib(item);                     \
 576         bool flag;                                                      \
 577         int ret;                                                        \
 578                                                                         \
 579         ret = strtobool(page, &flag);                                   \
 580         if (ret < 0)                                                    \
 581                 return ret;                                             \
 582         da->_name = flag;                                               \
 583         return count;                                                   \
 584 }
 585
 586 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
 587 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
 588 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
 589 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_pr);
 590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
 591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
 592
 593 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
 594 static ssize_t _name##_store(struct config_item *item, const char *page,\
 595                 size_t count)                                           \
 596 {                                                                       \
 597         printk_once(KERN_WARNING                                        \
 598                 "ignoring deprecated %s attribute\n",                   \
 599                 __stringify(_name));                                    \
 600         return count;                                                   \
 601 }
 602
 603 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
 604 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
 605
 606 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 607 {
 608         const char *configname;
 609
 610         configname = config_item_name(&dev->dev_group.cg_item);
 611         if (strlen(configname) >= INQUIRY_MODEL_LEN) {
 612                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 613                         "INQUIRY_MODEL, truncating to 15 characters\n", dev,
 614                         configname);
 615         }
 616         /*
 617          * XXX We can't use sizeof(dev->t10_wwn.model) (INQUIRY_MODEL_LEN + 1)
 618          * here without potentially breaking existing setups, so continue to
 619          * truncate one byte shorter than what can be carried in INQUIRY.
 620          */
 621         strlcpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
 622 }
 623
 624 static ssize_t emulate_model_alias_store(struct config_item *item,
 625                 const char *page, size_t count)
 626 {
 627         struct se_dev_attrib *da = to_attrib(item);
 628         struct se_device *dev = da->da_dev;
 629         bool flag;
 630         int ret;
 631
 632         if (dev->export_count) {
 633                 pr_err("dev[%p]: Unable to change model alias"
 634                         " while export_count is %d\n",
 635                         dev, dev->export_count);
 636                 return -EINVAL;
 637         }
 638
 639         ret = strtobool(page, &flag);
 640         if (ret < 0)
 641                 return ret;
 642
 643         BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
 644         if (flag) {
 645                 dev_set_t10_wwn_model_alias(dev);
 646         } else {
 647                 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 648                         sizeof(dev->t10_wwn.model));
 649         }
 650         da->emulate_model_alias = flag;
 651         return count;
 652 }
 653
 654 static ssize_t emulate_write_cache_store(struct config_item *item,
 655                 const char *page, size_t count)
 656 {
 657         struct se_dev_attrib *da = to_attrib(item);
 658         bool flag;
 659         int ret;
 660
 661         ret = strtobool(page, &flag);
 662         if (ret < 0)
 663                 return ret;
 664
 665         if (flag && da->da_dev->transport->get_write_cache) {
 666                 pr_err("emulate_write_cache not supported for this device\n");
 667                 return -EINVAL;
 668         }
 669
 670         da->emulate_write_cache = flag;
 671         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 672                         da->da_dev, flag);
 673         return count;
 674 }
 675
 676 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
 677                 const char *page, size_t count)
 678 {
 679         struct se_dev_attrib *da = to_attrib(item);
 680         u32 val;
 681         int ret;
 682
 683         ret = kstrtou32(page, 0, &val);
 684         if (ret < 0)
 685                 return ret;
 686
 687         if (val != TARGET_UA_INTLCK_CTRL_CLEAR
 688          && val != TARGET_UA_INTLCK_CTRL_NO_CLEAR
 689          && val != TARGET_UA_INTLCK_CTRL_ESTABLISH_UA) {
 690                 pr_err("Illegal value %d\n", val);
 691                 return -EINVAL;
 692         }
 693
 694         if (da->da_dev->export_count) {
 695                 pr_err("dev[%p]: Unable to change SE Device"
 696                         " UA_INTRLCK_CTRL while export_count is %d\n",
 697                         da->da_dev, da->da_dev->export_count);
 698                 return -EINVAL;
 699         }
 700         da->emulate_ua_intlck_ctrl = val;
 701         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 702                 da->da_dev, val);
 703         return count;
 704 }
 705
 706 static ssize_t emulate_tas_store(struct config_item *item,
 707                 const char *page, size_t count)
 708 {
 709         struct se_dev_attrib *da = to_attrib(item);
 710         bool flag;
 711         int ret;
 712
 713         ret = strtobool(page, &flag);
 714         if (ret < 0)
 715                 return ret;
 716
 717         if (da->da_dev->export_count) {
 718                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 719                         " export_count is %d\n",
 720                         da->da_dev, da->da_dev->export_count);
 721                 return -EINVAL;
 722         }
 723         da->emulate_tas = flag;
 724         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 725                 da->da_dev, flag ? "Enabled" : "Disabled");
 726
 727         return count;
 728 }
 729
 730 static ssize_t emulate_tpu_store(struct config_item *item,
 731                 const char *page, size_t count)
 732 {
 733         struct se_dev_attrib *da = to_attrib(item);
 734         bool flag;
 735         int ret;
 736
 737         ret = strtobool(page, &flag);
 738         if (ret < 0)
 739                 return ret;
 740
 741         /*
 742          * We expect this value to be non-zero when generic Block Layer
 743          * Discard supported is detected iblock_create_virtdevice().
 744          */
 745         if (flag && !da->max_unmap_block_desc_count) {
 746                 pr_err("Generic Block Discard not supported\n");
 747                 return -ENOSYS;
 748         }
 749
 750         da->emulate_tpu = flag;
 751         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 752                 da->da_dev, flag);
 753         return count;
 754 }
 755
 756 static ssize_t emulate_tpws_store(struct config_item *item,
 757                 const char *page, size_t count)
 758 {
 759         struct se_dev_attrib *da = to_attrib(item);
 760         bool flag;
 761         int ret;
 762
 763         ret = strtobool(page, &flag);
 764         if (ret < 0)
 765                 return ret;
 766
 767         /*
 768          * We expect this value to be non-zero when generic Block Layer
 769          * Discard supported is detected iblock_create_virtdevice().
 770          */
 771         if (flag && !da->max_unmap_block_desc_count) {
 772                 pr_err("Generic Block Discard not supported\n");
 773                 return -ENOSYS;
 774         }
 775
 776         da->emulate_tpws = flag;
 777         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 778                                 da->da_dev, flag);
 779         return count;
 780 }
 781
 782 static ssize_t pi_prot_type_store(struct config_item *item,
 783                 const char *page, size_t count)
 784 {
 785         struct se_dev_attrib *da = to_attrib(item);
 786         int old_prot = da->pi_prot_type, ret;
 787         struct se_device *dev = da->da_dev;
 788         u32 flag;
 789
 790         ret = kstrtou32(page, 0, &flag);
 791         if (ret < 0)
 792                 return ret;
 793
 794         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 795                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 796                 return -EINVAL;
 797         }
 798         if (flag == 2) {
 799                 pr_err("DIF TYPE2 protection currently not supported\n");
 800                 return -ENOSYS;
 801         }
 802         if (da->hw_pi_prot_type) {
 803                 pr_warn("DIF protection enabled on underlying hardware,"
 804                         " ignoring\n");
 805                 return count;
 806         }
 807         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 808                 /* 0 is only allowed value for non-supporting backends */
 809                 if (flag == 0)
 810                         return count;
 811
 812                 pr_err("DIF protection not supported by backend: %s\n",
 813                        dev->transport->name);
 814                 return -ENOSYS;
 815         }
 816         if (!target_dev_configured(dev)) {
 817                 pr_err("DIF protection requires device to be configured\n");
 818                 return -ENODEV;
 819         }
 820         if (dev->export_count) {
 821                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 822                        " export_count is %d\n", dev, dev->export_count);
 823                 return -EINVAL;
 824         }
 825
 826         da->pi_prot_type = flag;
 827
 828         if (flag && !old_prot) {
 829                 ret = dev->transport->init_prot(dev);
 830                 if (ret) {
 831                         da->pi_prot_type = old_prot;
 832                         da->pi_prot_verify = (bool) da->pi_prot_type;
 833                         return ret;
 834                 }
 835
 836         } else if (!flag && old_prot) {
 837                 dev->transport->free_prot(dev);
 838         }
 839
 840         da->pi_prot_verify = (bool) da->pi_prot_type;
 841         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 842         return count;
 843 }
 844
 845 /* always zero, but attr needs to remain RW to avoid userspace breakage */
 846 static ssize_t pi_prot_format_show(struct config_item *item, char *page)
 847 {
 848         return snprintf(page, PAGE_SIZE, "0\n");
 849 }
 850
 851 static ssize_t pi_prot_format_store(struct config_item *item,
 852                 const char *page, size_t count)
 853 {
 854         struct se_dev_attrib *da = to_attrib(item);
 855         struct se_device *dev = da->da_dev;
 856         bool flag;
 857         int ret;
 858
 859         ret = strtobool(page, &flag);
 860         if (ret < 0)
 861                 return ret;
 862
 863         if (!flag)
 864                 return count;
 865
 866         if (!dev->transport->format_prot) {
 867                 pr_err("DIF protection format not supported by backend %s\n",
 868                        dev->transport->name);
 869                 return -ENOSYS;
 870         }
 871         if (!target_dev_configured(dev)) {
 872                 pr_err("DIF protection format requires device to be configured\n");
 873                 return -ENODEV;
 874         }
 875         if (dev->export_count) {
 876                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 877                        " export_count is %d\n", dev, dev->export_count);
 878                 return -EINVAL;
 879         }
 880
 881         ret = dev->transport->format_prot(dev);
 882         if (ret)
 883                 return ret;
 884
 885         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
 886         return count;
 887 }
 888
 889 static ssize_t pi_prot_verify_store(struct config_item *item,
 890                 const char *page, size_t count)
 891 {
 892         struct se_dev_attrib *da = to_attrib(item);
 893         bool flag;
 894         int ret;
 895
 896         ret = strtobool(page, &flag);
 897         if (ret < 0)
 898                 return ret;
 899
 900         if (!flag) {
 901                 da->pi_prot_verify = flag;
 902                 return count;
 903         }
 904         if (da->hw_pi_prot_type) {
 905                 pr_warn("DIF protection enabled on underlying hardware,"
 906                         " ignoring\n");
 907                 return count;
 908         }
 909         if (!da->pi_prot_type) {
 910                 pr_warn("DIF protection not supported by backend, ignoring\n");
 911                 return count;
 912         }
 913         da->pi_prot_verify = flag;
 914
 915         return count;
 916 }
 917
 918 static ssize_t force_pr_aptpl_store(struct config_item *item,
 919                 const char *page, size_t count)
 920 {
 921         struct se_dev_attrib *da = to_attrib(item);
 922         bool flag;
 923         int ret;
 924
 925         ret = strtobool(page, &flag);
 926         if (ret < 0)
 927                 return ret;
 928         if (da->da_dev->export_count) {
 929                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
 930                        " export_count is %d\n",
 931                        da->da_dev, da->da_dev->export_count);
 932                 return -EINVAL;
 933         }
 934
 935         da->force_pr_aptpl = flag;
 936         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
 937         return count;
 938 }
 939
 940 static ssize_t emulate_rest_reord_store(struct config_item *item,
 941                 const char *page, size_t count)
 942 {
 943         struct se_dev_attrib *da = to_attrib(item);
 944         bool flag;
 945         int ret;
 946
 947         ret = strtobool(page, &flag);
 948         if (ret < 0)
 949                 return ret;
 950
 951         if (flag != 0) {
 952                 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
 953                         " reordering not implemented\n", da->da_dev);
 954                 return -ENOSYS;
 955         }
 956         da->emulate_rest_reord = flag;
 957         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
 958                 da->da_dev, flag);
 959         return count;
 960 }
 961
 962 static ssize_t unmap_zeroes_data_store(struct config_item *item,
 963                 const char *page, size_t count)
 964 {
 965         struct se_dev_attrib *da = to_attrib(item);
 966         bool flag;
 967         int ret;
 968
 969         ret = strtobool(page, &flag);
 970         if (ret < 0)
 971                 return ret;
 972
 973         if (da->da_dev->export_count) {
 974                 pr_err("dev[%p]: Unable to change SE Device"
 975                        " unmap_zeroes_data while export_count is %d\n",
 976                        da->da_dev, da->da_dev->export_count);
 977                 return -EINVAL;
 978         }
 979         /*
 980          * We expect this value to be non-zero when generic Block Layer
 981          * Discard supported is detected iblock_configure_device().
 982          */
 983         if (flag && !da->max_unmap_block_desc_count) {
 984                 pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
 985                        " because max_unmap_block_desc_count is zero\n",
 986                        da->da_dev);
 987                 return -ENOSYS;
 988         }
 989         da->unmap_zeroes_data = flag;
 990         pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
 991                  da->da_dev, flag);
 992         return count;
 993 }
 994
 995 /*
 996  * Note, this can only be called on unexported SE Device Object.
 997  */
 998 static ssize_t queue_depth_store(struct config_item *item,
 999                 const char *page, size_t count)
1000 {
1001         struct se_dev_attrib *da = to_attrib(item);
1002         struct se_device *dev = da->da_dev;
1003         u32 val;
1004         int ret;
1005
1006         ret = kstrtou32(page, 0, &val);
1007         if (ret < 0)
1008                 return ret;
1009
1010         if (dev->export_count) {
1011                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1012                         " export_count is %d\n",
1013                         dev, dev->export_count);
1014                 return -EINVAL;
1015         }
1016         if (!val) {
1017                 pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1018                 return -EINVAL;
1019         }
1020
1021         if (val > dev->dev_attrib.queue_depth) {
1022                 if (val > dev->dev_attrib.hw_queue_depth) {
1023                         pr_err("dev[%p]: Passed queue_depth:"
1024                                 " %u exceeds TCM/SE_Device MAX"
1025                                 " TCQ: %u\n", dev, val,
1026                                 dev->dev_attrib.hw_queue_depth);
1027                         return -EINVAL;
1028                 }
1029         }
1030         da->queue_depth = dev->queue_depth = val;
1031         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1032         return count;
1033 }
1034
1035 static ssize_t optimal_sectors_store(struct config_item *item,
1036                 const char *page, size_t count)
1037 {
1038         struct se_dev_attrib *da = to_attrib(item);
1039         u32 val;
1040         int ret;
1041
1042         ret = kstrtou32(page, 0, &val);
1043         if (ret < 0)
1044                 return ret;
1045
1046         if (da->da_dev->export_count) {
1047                 pr_err("dev[%p]: Unable to change SE Device"
1048                         " optimal_sectors while export_count is %d\n",
1049                         da->da_dev, da->da_dev->export_count);
1050                 return -EINVAL;
1051         }
1052         if (val > da->hw_max_sectors) {
1053                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1054                         " greater than hw_max_sectors: %u\n",
1055                         da->da_dev, val, da->hw_max_sectors);
1056                 return -EINVAL;
1057         }
1058
1059         da->optimal_sectors = val;
1060         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1061                         da->da_dev, val);
1062         return count;
1063 }
1064
1065 static ssize_t block_size_store(struct config_item *item,
1066                 const char *page, size_t count)
1067 {
1068         struct se_dev_attrib *da = to_attrib(item);
1069         u32 val;
1070         int ret;
1071
1072         ret = kstrtou32(page, 0, &val);
1073         if (ret < 0)
1074                 return ret;
1075
1076         if (da->da_dev->export_count) {
1077                 pr_err("dev[%p]: Unable to change SE Device block_size"
1078                         " while export_count is %d\n",
1079                         da->da_dev, da->da_dev->export_count);
1080                 return -EINVAL;
1081         }
1082
1083         if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1084                 pr_err("dev[%p]: Illegal value for block_device: %u"
1085                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1086                         da->da_dev, val);
1087                 return -EINVAL;
1088         }
1089
1090         da->block_size = val;
1091         if (da->max_bytes_per_io)
1092                 da->hw_max_sectors = da->max_bytes_per_io / val;
1093
1094         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1095                         da->da_dev, val);
1096         return count;
1097 }
1098
1099 static ssize_t alua_support_show(struct config_item *item, char *page)
1100 {
1101         struct se_dev_attrib *da = to_attrib(item);
1102         u8 flags = da->da_dev->transport_flags;
1103
1104         return snprintf(page, PAGE_SIZE, "%d\n",
1105                         flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1106 }
1107
1108 static ssize_t alua_support_store(struct config_item *item,
1109                 const char *page, size_t count)
1110 {
1111         struct se_dev_attrib *da = to_attrib(item);
1112         struct se_device *dev = da->da_dev;
1113         bool flag, oldflag;
1114         int ret;
1115
1116         ret = strtobool(page, &flag);
1117         if (ret < 0)
1118                 return ret;
1119
1120         oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA);
1121         if (flag == oldflag)
1122                 return count;
1123
1124         if (!(dev->transport->transport_flags_changeable &
1125               TRANSPORT_FLAG_PASSTHROUGH_ALUA)) {
1126                 pr_err("dev[%p]: Unable to change SE Device alua_support:"
1127                         " alua_support has fixed value\n", dev);
1128                 return -ENOSYS;
1129         }
1130
1131         if (flag)
1132                 dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1133         else
1134                 dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1135         return count;
1136 }
1137
1138 static ssize_t pgr_support_show(struct config_item *item, char *page)
1139 {
1140         struct se_dev_attrib *da = to_attrib(item);
1141         u8 flags = da->da_dev->transport_flags;
1142
1143         return snprintf(page, PAGE_SIZE, "%d\n",
1144                         flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1145 }
1146
1147 static ssize_t pgr_support_store(struct config_item *item,
1148                 const char *page, size_t count)
1149 {
1150         struct se_dev_attrib *da = to_attrib(item);
1151         struct se_device *dev = da->da_dev;
1152         bool flag, oldflag;
1153         int ret;
1154
1155         ret = strtobool(page, &flag);
1156         if (ret < 0)
1157                 return ret;
1158
1159         oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR);
1160         if (flag == oldflag)
1161                 return count;
1162
1163         if (!(dev->transport->transport_flags_changeable &
1164               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1165                 pr_err("dev[%p]: Unable to change SE Device pgr_support:"
1166                         " pgr_support has fixed value\n", dev);
1167                 return -ENOSYS;
1168         }
1169
1170         if (flag)
1171                 dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_PGR;
1172         else
1173                 dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_PGR;
1174         return count;
1175 }
1176
1177 CONFIGFS_ATTR(, emulate_model_alias);
1178 CONFIGFS_ATTR(, emulate_dpo);
1179 CONFIGFS_ATTR(, emulate_fua_write);
1180 CONFIGFS_ATTR(, emulate_fua_read);
1181 CONFIGFS_ATTR(, emulate_write_cache);
1182 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1183 CONFIGFS_ATTR(, emulate_tas);
1184 CONFIGFS_ATTR(, emulate_tpu);
1185 CONFIGFS_ATTR(, emulate_tpws);
1186 CONFIGFS_ATTR(, emulate_caw);
1187 CONFIGFS_ATTR(, emulate_3pc);
1188 CONFIGFS_ATTR(, emulate_pr);
1189 CONFIGFS_ATTR(, pi_prot_type);
1190 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1191 CONFIGFS_ATTR(, pi_prot_format);
1192 CONFIGFS_ATTR(, pi_prot_verify);
1193 CONFIGFS_ATTR(, enforce_pr_isids);
1194 CONFIGFS_ATTR(, is_nonrot);
1195 CONFIGFS_ATTR(, emulate_rest_reord);
1196 CONFIGFS_ATTR(, force_pr_aptpl);
1197 CONFIGFS_ATTR_RO(, hw_block_size);
1198 CONFIGFS_ATTR(, block_size);
1199 CONFIGFS_ATTR_RO(, hw_max_sectors);
1200 CONFIGFS_ATTR(, optimal_sectors);
1201 CONFIGFS_ATTR_RO(, hw_queue_depth);
1202 CONFIGFS_ATTR(, queue_depth);
1203 CONFIGFS_ATTR(, max_unmap_lba_count);
1204 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1205 CONFIGFS_ATTR(, unmap_granularity);
1206 CONFIGFS_ATTR(, unmap_granularity_alignment);
1207 CONFIGFS_ATTR(, unmap_zeroes_data);
1208 CONFIGFS_ATTR(, max_write_same_len);
1209 CONFIGFS_ATTR(, alua_support);
1210 CONFIGFS_ATTR(, pgr_support);
1211
1212 /*
1213  * dev_attrib attributes for devices using the target core SBC/SPC
1214  * interpreter.  Any backend using spc_parse_cdb should be using
1215  * these.
1216  */
1217 struct configfs_attribute *sbc_attrib_attrs[] = {
1218         &attr_emulate_model_alias,
1219         &attr_emulate_dpo,
1220         &attr_emulate_fua_write,
1221         &attr_emulate_fua_read,
1222         &attr_emulate_write_cache,
1223         &attr_emulate_ua_intlck_ctrl,
1224         &attr_emulate_tas,
1225         &attr_emulate_tpu,
1226         &attr_emulate_tpws,
1227         &attr_emulate_caw,
1228         &attr_emulate_3pc,
1229         &attr_emulate_pr,
1230         &attr_pi_prot_type,
1231         &attr_hw_pi_prot_type,
1232         &attr_pi_prot_format,
1233         &attr_pi_prot_verify,
1234         &attr_enforce_pr_isids,
1235         &attr_is_nonrot,
1236         &attr_emulate_rest_reord,
1237         &attr_force_pr_aptpl,
1238         &attr_hw_block_size,
1239         &attr_block_size,
1240         &attr_hw_max_sectors,
1241         &attr_optimal_sectors,
1242         &attr_hw_queue_depth,
1243         &attr_queue_depth,
1244         &attr_max_unmap_lba_count,
1245         &attr_max_unmap_block_desc_count,
1246         &attr_unmap_granularity,
1247         &attr_unmap_granularity_alignment,
1248         &attr_unmap_zeroes_data,
1249         &attr_max_write_same_len,
1250         &attr_alua_support,
1251         &attr_pgr_support,
1252         NULL,
1253 };
1254 EXPORT_SYMBOL(sbc_attrib_attrs);
1255
1256 /*
1257  * Minimal dev_attrib attributes for devices passing through CDBs.
1258  * In this case we only provide a few read-only attributes for
1259  * backwards compatibility.
1260  */
1261 struct configfs_attribute *passthrough_attrib_attrs[] = {
1262         &attr_hw_pi_prot_type,
1263         &attr_hw_block_size,
1264         &attr_hw_max_sectors,
1265         &attr_hw_queue_depth,
1266         &attr_emulate_pr,
1267         &attr_alua_support,
1268         &attr_pgr_support,
1269         NULL,
1270 };
1271 EXPORT_SYMBOL(passthrough_attrib_attrs);
1272
1273 /*
1274  * pr related dev_attrib attributes for devices passing through CDBs,
1275  * but allowing in core pr emulation.
1276  */
1277 struct configfs_attribute *passthrough_pr_attrib_attrs[] = {
1278         &attr_enforce_pr_isids,
1279         &attr_force_pr_aptpl,
1280         NULL,
1281 };
1282 EXPORT_SYMBOL(passthrough_pr_attrib_attrs);
1283
1284 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1285 TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
1286
1287 /* End functions for struct config_item_type tb_dev_attrib_cit */
1288
1289 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1290
1291 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1292 {
1293         return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1294 }
1295
1296 static ssize_t target_check_inquiry_data(char *buf)
1297 {
1298         size_t len;
1299         int i;
1300
1301         len = strlen(buf);
1302
1303         /*
1304          * SPC 4.3.1:
1305          * ASCII data fields shall contain only ASCII printable characters
1306          * (i.e., code values 20h to 7Eh) and may be terminated with one or
1307          * more ASCII null (00h) characters.
1308          */
1309         for (i = 0; i < len; i++) {
1310                 if (buf[i] < 0x20 || buf[i] > 0x7E) {
1311                         pr_err("Emulated T10 Inquiry Data contains non-ASCII-printable characters\n");
1312                         return -EINVAL;
1313                 }
1314         }
1315
1316         return len;
1317 }
1318
1319 /*
1320  * STANDARD and VPD page 0x83 T10 Vendor Identification
1321  */
1322 static ssize_t target_wwn_vendor_id_show(struct config_item *item,
1323                 char *page)
1324 {
1325         return sprintf(page, "%s\n", &to_t10_wwn(item)->vendor[0]);
1326 }
1327
1328 static ssize_t target_wwn_vendor_id_store(struct config_item *item,
1329                 const char *page, size_t count)
1330 {
1331         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1332         struct se_device *dev = t10_wwn->t10_dev;
1333         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1334         unsigned char buf[INQUIRY_VENDOR_LEN + 2];
1335         char *stripped = NULL;
1336         size_t len;
1337         ssize_t ret;
1338
1339         len = strlcpy(buf, page, sizeof(buf));
1340         if (len < sizeof(buf)) {
1341                 /* Strip any newline added from userspace. */
1342                 stripped = strstrip(buf);
1343                 len = strlen(stripped);
1344         }
1345         if (len > INQUIRY_VENDOR_LEN) {
1346                 pr_err("Emulated T10 Vendor Identification exceeds"
1347                         " INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
1348                         "\n");
1349                 return -EOVERFLOW;
1350         }
1351
1352         ret = target_check_inquiry_data(stripped);
1353
1354         if (ret < 0)
1355                 return ret;
1356
1357         /*
1358          * Check to see if any active exports exist.  If they do exist, fail
1359          * here as changing this information on the fly (underneath the
1360          * initiator side OS dependent multipath code) could cause negative
1361          * effects.
1362          */
1363         if (dev->export_count) {
1364                 pr_err("Unable to set T10 Vendor Identification while"
1365                         " active %d exports exist\n", dev->export_count);
1366                 return -EINVAL;
1367         }
1368
1369         BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
1370         strlcpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));
1371
1372         pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"
1373                  " %s\n", dev->t10_wwn.vendor);
1374
1375         return count;
1376 }
1377
1378 static ssize_t target_wwn_product_id_show(struct config_item *item,
1379                 char *page)
1380 {
1381         return sprintf(page, "%s\n", &to_t10_wwn(item)->model[0]);
1382 }
1383
1384 static ssize_t target_wwn_product_id_store(struct config_item *item,
1385                 const char *page, size_t count)
1386 {
1387         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1388         struct se_device *dev = t10_wwn->t10_dev;
1389         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1390         unsigned char buf[INQUIRY_MODEL_LEN + 2];
1391         char *stripped = NULL;
1392         size_t len;
1393         ssize_t ret;
1394
1395         len = strlcpy(buf, page, sizeof(buf));
1396         if (len < sizeof(buf)) {
1397                 /* Strip any newline added from userspace. */
1398                 stripped = strstrip(buf);
1399                 len = strlen(stripped);
1400         }
1401         if (len > INQUIRY_MODEL_LEN) {
1402                 pr_err("Emulated T10 Vendor exceeds INQUIRY_MODEL_LEN: "
1403                          __stringify(INQUIRY_MODEL_LEN)
1404                         "\n");
1405                 return -EOVERFLOW;
1406         }
1407
1408         ret = target_check_inquiry_data(stripped);
1409
1410         if (ret < 0)
1411                 return ret;
1412
1413         /*
1414          * Check to see if any active exports exist.  If they do exist, fail
1415          * here as changing this information on the fly (underneath the
1416          * initiator side OS dependent multipath code) could cause negative
1417          * effects.
1418          */
1419         if (dev->export_count) {
1420                 pr_err("Unable to set T10 Model while active %d exports exist\n",
1421                         dev->export_count);
1422                 return -EINVAL;
1423         }
1424
1425         BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
1426         strlcpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));
1427
1428         pr_debug("Target_Core_ConfigFS: Set emulated T10 Model Identification: %s\n",
1429                  dev->t10_wwn.model);
1430
1431         return count;
1432 }
1433
1434 static ssize_t target_wwn_revision_show(struct config_item *item,
1435                 char *page)
1436 {
1437         return sprintf(page, "%s\n", &to_t10_wwn(item)->revision[0]);
1438 }
1439
1440 static ssize_t target_wwn_revision_store(struct config_item *item,
1441                 const char *page, size_t count)
1442 {
1443         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1444         struct se_device *dev = t10_wwn->t10_dev;
1445         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1446         unsigned char buf[INQUIRY_REVISION_LEN + 2];
1447         char *stripped = NULL;
1448         size_t len;
1449         ssize_t ret;
1450
1451         len = strlcpy(buf, page, sizeof(buf));
1452         if (len < sizeof(buf)) {
1453                 /* Strip any newline added from userspace. */
1454                 stripped = strstrip(buf);
1455                 len = strlen(stripped);
1456         }
1457         if (len > INQUIRY_REVISION_LEN) {
1458                 pr_err("Emulated T10 Revision exceeds INQUIRY_REVISION_LEN: "
1459                          __stringify(INQUIRY_REVISION_LEN)
1460                         "\n");
1461                 return -EOVERFLOW;
1462         }
1463
1464         ret = target_check_inquiry_data(stripped);
1465
1466         if (ret < 0)
1467                 return ret;
1468
1469         /*
1470          * Check to see if any active exports exist.  If they do exist, fail
1471          * here as changing this information on the fly (underneath the
1472          * initiator side OS dependent multipath code) could cause negative
1473          * effects.
1474          */
1475         if (dev->export_count) {
1476                 pr_err("Unable to set T10 Revision while active %d exports exist\n",
1477                         dev->export_count);
1478                 return -EINVAL;
1479         }
1480
1481         BUILD_BUG_ON(sizeof(dev->t10_wwn.revision) != INQUIRY_REVISION_LEN + 1);
1482         strlcpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));
1483
1484         pr_debug("Target_Core_ConfigFS: Set emulated T10 Revision: %s\n",
1485                  dev->t10_wwn.revision);
1486
1487         return count;
1488 }
1489
1490 static ssize_t
1491 target_wwn_company_id_show(struct config_item *item,
1492                                 char *page)
1493 {
1494         return snprintf(page, PAGE_SIZE, "%#08x\n",
1495                         to_t10_wwn(item)->company_id);
1496 }
1497
1498 static ssize_t
1499 target_wwn_company_id_store(struct config_item *item,
1500                                  const char *page, size_t count)
1501 {
1502         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1503         struct se_device *dev = t10_wwn->t10_dev;
1504         u32 val;
1505         int ret;
1506
1507         /*
1508          * The IEEE COMPANY_ID field should contain a 24-bit canonical
1509          * form OUI assigned by the IEEE.
1510          */
1511         ret = kstrtou32(page, 0, &val);
1512         if (ret < 0)
1513                 return ret;
1514
1515         if (val >= 0x1000000)
1516                 return -EOVERFLOW;
1517
1518         /*
1519          * Check to see if any active exports exist. If they do exist, fail
1520          * here as changing this information on the fly (underneath the
1521          * initiator side OS dependent multipath code) could cause negative
1522          * effects.
1523          */
1524         if (dev->export_count) {
1525                 pr_err("Unable to set Company ID while %u exports exist\n",
1526                        dev->export_count);
1527                 return -EINVAL;
1528         }
1529
1530         t10_wwn->company_id = val;
1531
1532         pr_debug("Target_Core_ConfigFS: Set IEEE Company ID: %#08x\n",
1533                  t10_wwn->company_id);
1534
1535         return count;
1536 }
1537
1538 /*
1539  * VPD page 0x80 Unit serial
1540  */
1541 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1542                 char *page)
1543 {
1544         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1545                 &to_t10_wwn(item)->unit_serial[0]);
1546 }
1547
1548 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1549                 const char *page, size_t count)
1550 {
1551         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1552         struct se_device *dev = t10_wwn->t10_dev;
1553         unsigned char buf[INQUIRY_VPD_SERIAL_LEN] = { };
1554
1555         /*
1556          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1557          * from the struct scsi_device level firmware, do not allow
1558          * VPD Unit Serial to be emulated.
1559          *
1560          * Note this struct scsi_device could also be emulating VPD
1561          * information from its drivers/scsi LLD.  But for now we assume
1562          * it is doing 'the right thing' wrt a world wide unique
1563          * VPD Unit Serial Number that OS dependent multipath can depend on.
1564          */
1565         if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1566                 pr_err("Underlying SCSI device firmware provided VPD"
1567                         " Unit Serial, ignoring request\n");
1568                 return -EOPNOTSUPP;
1569         }
1570
1571         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1572                 pr_err("Emulated VPD Unit Serial exceeds"
1573                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1574                 return -EOVERFLOW;
1575         }
1576         /*
1577          * Check to see if any active $FABRIC_MOD exports exist.  If they
1578          * do exist, fail here as changing this information on the fly
1579          * (underneath the initiator side OS dependent multipath code)
1580          * could cause negative effects.
1581          */
1582         if (dev->export_count) {
1583                 pr_err("Unable to set VPD Unit Serial while"
1584                         " active %d $FABRIC_MOD exports exist\n",
1585                         dev->export_count);
1586                 return -EINVAL;
1587         }
1588
1589         /*
1590          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1591          *
1592          * Also, strip any newline added from the userspace
1593          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1594          */
1595         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1596         snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1597                         "%s", strstrip(buf));
1598         dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1599
1600         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1601                         " %s\n", dev->t10_wwn.unit_serial);
1602
1603         return count;
1604 }
1605
1606 /*
1607  * VPD page 0x83 Protocol Identifier
1608  */
1609 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1610                 char *page)
1611 {
1612         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1613         struct t10_vpd *vpd;
1614         unsigned char buf[VPD_TMP_BUF_SIZE] = { };
1615         ssize_t len = 0;
1616
1617         spin_lock(&t10_wwn->t10_vpd_lock);
1618         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1619                 if (!vpd->protocol_identifier_set)
1620                         continue;
1621
1622                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1623
1624                 if (len + strlen(buf) >= PAGE_SIZE)
1625                         break;
1626
1627                 len += sprintf(page+len, "%s", buf);
1628         }
1629         spin_unlock(&t10_wwn->t10_vpd_lock);
1630
1631         return len;
1632 }
1633
1634 /*
1635  * Generic wrapper for dumping VPD identifiers by association.
1636  */
1637 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
1638 static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
1639                 char *page)                                             \
1640 {                                                                       \
1641         struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
1642         struct t10_vpd *vpd;                                            \
1643         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
1644         ssize_t len = 0;                                                \
1645                                                                         \
1646         spin_lock(&t10_wwn->t10_vpd_lock);                              \
1647         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
1648                 if (vpd->association != _assoc)                         \
1649                         continue;                                       \
1650                                                                         \
1651                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1652                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
1653                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1654                         break;                                          \
1655                 len += sprintf(page+len, "%s", buf);                    \
1656                                                                         \
1657                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1658                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1659                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1660                         break;                                          \
1661                 len += sprintf(page+len, "%s", buf);                    \
1662                                                                         \
1663                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1664                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1665                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1666                         break;                                          \
1667                 len += sprintf(page+len, "%s", buf);                    \
1668         }                                                               \
1669         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
1670                                                                         \
1671         return len;                                                     \
1672 }
1673
1674 /* VPD page 0x83 Association: Logical Unit */
1675 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1676 /* VPD page 0x83 Association: Target Port */
1677 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1678 /* VPD page 0x83 Association: SCSI Target Device */
1679 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1680
1681 CONFIGFS_ATTR(target_wwn_, vendor_id);
1682 CONFIGFS_ATTR(target_wwn_, product_id);
1683 CONFIGFS_ATTR(target_wwn_, revision);
1684 CONFIGFS_ATTR(target_wwn_, company_id);
1685 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1686 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1687 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1688 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1689 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1690
1691 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1692         &target_wwn_attr_vendor_id,
1693         &target_wwn_attr_product_id,
1694         &target_wwn_attr_revision,
1695         &target_wwn_attr_company_id,
1696         &target_wwn_attr_vpd_unit_serial,
1697         &target_wwn_attr_vpd_protocol_identifier,
1698         &target_wwn_attr_vpd_assoc_logical_unit,
1699         &target_wwn_attr_vpd_assoc_target_port,
1700         &target_wwn_attr_vpd_assoc_scsi_target_device,
1701         NULL,
1702 };
1703
1704 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1705
1706 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1707
1708 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1709
1710 static struct se_device *pr_to_dev(struct config_item *item)
1711 {
1712         return container_of(to_config_group(item), struct se_device,
1713                         dev_pr_group);
1714 }
1715
1716 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1717                 char *page)
1718 {
1719         struct se_node_acl *se_nacl;
1720         struct t10_pr_registration *pr_reg;
1721         char i_buf[PR_REG_ISID_ID_LEN] = { };
1722
1723         pr_reg = dev->dev_pr_res_holder;
1724         if (!pr_reg)
1725                 return sprintf(page, "No SPC-3 Reservation holder\n");
1726
1727         se_nacl = pr_reg->pr_reg_nacl;
1728         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1729
1730         return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1731                 se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1732                 se_nacl->initiatorname, i_buf);
1733 }
1734
1735 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1736                 char *page)
1737 {
1738         struct se_session *sess = dev->reservation_holder;
1739         struct se_node_acl *se_nacl;
1740         ssize_t len;
1741
1742         if (sess) {
1743                 se_nacl = sess->se_node_acl;
1744                 len = sprintf(page,
1745                               "SPC-2 Reservation: %s Initiator: %s\n",
1746                               se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1747                               se_nacl->initiatorname);
1748         } else {
1749                 len = sprintf(page, "No SPC-2 Reservation holder\n");
1750         }
1751         return len;
1752 }
1753
1754 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1755 {
1756         struct se_device *dev = pr_to_dev(item);
1757         int ret;
1758
1759         if (!dev->dev_attrib.emulate_pr)
1760                 return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1761
1762         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1763                 return sprintf(page, "Passthrough\n");
1764
1765         spin_lock(&dev->dev_reservation_lock);
1766         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1767                 ret = target_core_dev_pr_show_spc2_res(dev, page);
1768         else
1769                 ret = target_core_dev_pr_show_spc3_res(dev, page);
1770         spin_unlock(&dev->dev_reservation_lock);
1771         return ret;
1772 }
1773
1774 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1775                 char *page)
1776 {
1777         struct se_device *dev = pr_to_dev(item);
1778         ssize_t len = 0;
1779
1780         spin_lock(&dev->dev_reservation_lock);
1781         if (!dev->dev_pr_res_holder) {
1782                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1783         } else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1784                 len = sprintf(page, "SPC-3 Reservation: All Target"
1785                         " Ports registration\n");
1786         } else {
1787                 len = sprintf(page, "SPC-3 Reservation: Single"
1788                         " Target Port registration\n");
1789         }
1790
1791         spin_unlock(&dev->dev_reservation_lock);
1792         return len;
1793 }
1794
1795 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1796                 char *page)
1797 {
1798         return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1799 }
1800
1801
1802 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1803                 char *page)
1804 {
1805         struct se_device *dev = pr_to_dev(item);
1806         struct se_node_acl *se_nacl;
1807         struct se_portal_group *se_tpg;
1808         struct t10_pr_registration *pr_reg;
1809         const struct target_core_fabric_ops *tfo;
1810         ssize_t len = 0;
1811
1812         spin_lock(&dev->dev_reservation_lock);
1813         pr_reg = dev->dev_pr_res_holder;
1814         if (!pr_reg) {
1815                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1816                 goto out_unlock;
1817         }
1818
1819         se_nacl = pr_reg->pr_reg_nacl;
1820         se_tpg = se_nacl->se_tpg;
1821         tfo = se_tpg->se_tpg_tfo;
1822
1823         len += sprintf(page+len, "SPC-3 Reservation: %s"
1824                 " Target Node Endpoint: %s\n", tfo->fabric_name,
1825                 tfo->tpg_get_wwn(se_tpg));
1826         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1827                 " Identifier Tag: %hu %s Portal Group Tag: %hu"
1828                 " %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1829                 tfo->fabric_name, tfo->tpg_get_tag(se_tpg),
1830                 tfo->fabric_name, pr_reg->pr_aptpl_target_lun);
1831
1832 out_unlock:
1833         spin_unlock(&dev->dev_reservation_lock);
1834         return len;
1835 }
1836
1837
1838 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1839                 char *page)
1840 {
1841         struct se_device *dev = pr_to_dev(item);
1842         const struct target_core_fabric_ops *tfo;
1843         struct t10_pr_registration *pr_reg;
1844         unsigned char buf[384];
1845         char i_buf[PR_REG_ISID_ID_LEN];
1846         ssize_t len = 0;
1847         int reg_count = 0;
1848
1849         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1850
1851         spin_lock(&dev->t10_pr.registration_lock);
1852         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1853                         pr_reg_list) {
1854
1855                 memset(buf, 0, 384);
1856                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1857                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1858                 core_pr_dump_initiator_port(pr_reg, i_buf,
1859                                         PR_REG_ISID_ID_LEN);
1860                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1861                         tfo->fabric_name,
1862                         pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1863                         pr_reg->pr_res_generation);
1864
1865                 if (len + strlen(buf) >= PAGE_SIZE)
1866                         break;
1867
1868                 len += sprintf(page+len, "%s", buf);
1869                 reg_count++;
1870         }
1871         spin_unlock(&dev->t10_pr.registration_lock);
1872
1873         if (!reg_count)
1874                 len += sprintf(page+len, "None\n");
1875
1876         return len;
1877 }
1878
1879 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1880 {
1881         struct se_device *dev = pr_to_dev(item);
1882         struct t10_pr_registration *pr_reg;
1883         ssize_t len = 0;
1884
1885         spin_lock(&dev->dev_reservation_lock);
1886         pr_reg = dev->dev_pr_res_holder;
1887         if (pr_reg) {
1888                 len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1889                         core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1890         } else {
1891                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1892         }
1893
1894         spin_unlock(&dev->dev_reservation_lock);
1895         return len;
1896 }
1897
1898 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1899 {
1900         struct se_device *dev = pr_to_dev(item);
1901
1902         if (!dev->dev_attrib.emulate_pr)
1903                 return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1904         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1905                 return sprintf(page, "SPC_PASSTHROUGH\n");
1906         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1907                 return sprintf(page, "SPC2_RESERVATIONS\n");
1908
1909         return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1910 }
1911
1912 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1913                 char *page)
1914 {
1915         struct se_device *dev = pr_to_dev(item);
1916
1917         if (!dev->dev_attrib.emulate_pr ||
1918             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1919                 return 0;
1920
1921         return sprintf(page, "APTPL Bit Status: %s\n",
1922                 (dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1923 }
1924
1925 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1926                 char *page)
1927 {
1928         struct se_device *dev = pr_to_dev(item);
1929
1930         if (!dev->dev_attrib.emulate_pr ||
1931             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1932                 return 0;
1933
1934         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1935 }
1936
1937 enum {
1938         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1939         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1940         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1941         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1942 };
1943
1944 static match_table_t tokens = {
1945         {Opt_initiator_fabric, "initiator_fabric=%s"},
1946         {Opt_initiator_node, "initiator_node=%s"},
1947         {Opt_initiator_sid, "initiator_sid=%s"},
1948         {Opt_sa_res_key, "sa_res_key=%s"},
1949         {Opt_res_holder, "res_holder=%d"},
1950         {Opt_res_type, "res_type=%d"},
1951         {Opt_res_scope, "res_scope=%d"},
1952         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1953         {Opt_mapped_lun, "mapped_lun=%u"},
1954         {Opt_target_fabric, "target_fabric=%s"},
1955         {Opt_target_node, "target_node=%s"},
1956         {Opt_tpgt, "tpgt=%d"},
1957         {Opt_port_rtpi, "port_rtpi=%d"},
1958         {Opt_target_lun, "target_lun=%u"},
1959         {Opt_err, NULL}
1960 };
1961
1962 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1963                 const char *page, size_t count)
1964 {
1965         struct se_device *dev = pr_to_dev(item);
1966         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1967         unsigned char *t_fabric = NULL, *t_port = NULL;
1968         char *orig, *ptr, *opts;
1969         substring_t args[MAX_OPT_ARGS];
1970         unsigned long long tmp_ll;
1971         u64 sa_res_key = 0;
1972         u64 mapped_lun = 0, target_lun = 0;
1973         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1974         u16 tpgt = 0;
1975         u8 type = 0;
1976
1977         if (!dev->dev_attrib.emulate_pr ||
1978             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1979                 return count;
1980         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1981                 return count;
1982
1983         if (dev->export_count) {
1984                 pr_debug("Unable to process APTPL metadata while"
1985                         " active fabric exports exist\n");
1986                 return -EINVAL;
1987         }
1988
1989         opts = kstrdup(page, GFP_KERNEL);
1990         if (!opts)
1991                 return -ENOMEM;
1992
1993         orig = opts;
1994         while ((ptr = strsep(&opts, ",\n")) != NULL) {
1995                 if (!*ptr)
1996                         continue;
1997
1998                 token = match_token(ptr, tokens, args);
1999                 switch (token) {
2000                 case Opt_initiator_fabric:
2001                         i_fabric = match_strdup(args);
2002                         if (!i_fabric) {
2003                                 ret = -ENOMEM;
2004                                 goto out;
2005                         }
2006                         break;
2007                 case Opt_initiator_node:
2008                         i_port = match_strdup(args);
2009                         if (!i_port) {
2010                                 ret = -ENOMEM;
2011                                 goto out;
2012                         }
2013                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
2014                                 pr_err("APTPL metadata initiator_node="
2015                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
2016                                         PR_APTPL_MAX_IPORT_LEN);
2017                                 ret = -EINVAL;
2018                                 break;
2019                         }
2020                         break;
2021                 case Opt_initiator_sid:
2022                         isid = match_strdup(args);
2023                         if (!isid) {
2024                                 ret = -ENOMEM;
2025                                 goto out;
2026                         }
2027                         if (strlen(isid) >= PR_REG_ISID_LEN) {
2028                                 pr_err("APTPL metadata initiator_isid"
2029                                         "= exceeds PR_REG_ISID_LEN: %d\n",
2030                                         PR_REG_ISID_LEN);
2031                                 ret = -EINVAL;
2032                                 break;
2033                         }
2034                         break;
2035                 case Opt_sa_res_key:
2036                         ret = match_u64(args,  &tmp_ll);
2037                         if (ret < 0) {
2038                                 pr_err("kstrtoull() failed for sa_res_key=\n");
2039                                 goto out;
2040                         }
2041                         sa_res_key = (u64)tmp_ll;
2042                         break;
2043                 /*
2044                  * PR APTPL Metadata for Reservation
2045                  */
2046                 case Opt_res_holder:
2047                         ret = match_int(args, &arg);
2048                         if (ret)
2049                                 goto out;
2050                         res_holder = arg;
2051                         break;
2052                 case Opt_res_type:
2053                         ret = match_int(args, &arg);
2054                         if (ret)
2055                                 goto out;
2056                         type = (u8)arg;
2057                         break;
2058                 case Opt_res_scope:
2059                         ret = match_int(args, &arg);
2060                         if (ret)
2061                                 goto out;
2062                         break;
2063                 case Opt_res_all_tg_pt:
2064                         ret = match_int(args, &arg);
2065                         if (ret)
2066                                 goto out;
2067                         all_tg_pt = (int)arg;
2068                         break;
2069                 case Opt_mapped_lun:
2070                         ret = match_u64(args, &tmp_ll);
2071                         if (ret)
2072                                 goto out;
2073                         mapped_lun = (u64)tmp_ll;
2074                         break;
2075                 /*
2076                  * PR APTPL Metadata for Target Port
2077                  */
2078                 case Opt_target_fabric:
2079                         t_fabric = match_strdup(args);
2080                         if (!t_fabric) {
2081                                 ret = -ENOMEM;
2082                                 goto out;
2083                         }
2084                         break;
2085                 case Opt_target_node:
2086                         t_port = match_strdup(args);
2087                         if (!t_port) {
2088                                 ret = -ENOMEM;
2089                                 goto out;
2090                         }
2091                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
2092                                 pr_err("APTPL metadata target_node="
2093                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
2094                                         PR_APTPL_MAX_TPORT_LEN);
2095                                 ret = -EINVAL;
2096                                 break;
2097                         }
2098                         break;
2099                 case Opt_tpgt:
2100                         ret = match_int(args, &arg);
2101                         if (ret)
2102                                 goto out;
2103                         tpgt = (u16)arg;
2104                         break;
2105                 case Opt_port_rtpi:
2106                         ret = match_int(args, &arg);
2107                         if (ret)
2108                                 goto out;
2109                         break;
2110                 case Opt_target_lun:
2111                         ret = match_u64(args, &tmp_ll);
2112                         if (ret)
2113                                 goto out;
2114                         target_lun = (u64)tmp_ll;
2115                         break;
2116                 default:
2117                         break;
2118                 }
2119         }
2120
2121         if (!i_port || !t_port || !sa_res_key) {
2122                 pr_err("Illegal parameters for APTPL registration\n");
2123                 ret = -EINVAL;
2124                 goto out;
2125         }
2126
2127         if (res_holder && !(type)) {
2128                 pr_err("Illegal PR type: 0x%02x for reservation"
2129                                 " holder\n", type);
2130                 ret = -EINVAL;
2131                 goto out;
2132         }
2133
2134         ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
2135                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
2136                         res_holder, all_tg_pt, type);
2137 out:
2138         kfree(i_fabric);
2139         kfree(i_port);
2140         kfree(isid);
2141         kfree(t_fabric);
2142         kfree(t_port);
2143         kfree(orig);
2144         return (ret == 0) ? count : ret;
2145 }
2146
2147
2148 CONFIGFS_ATTR_RO(target_pr_, res_holder);
2149 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
2150 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
2151 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
2152 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
2153 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
2154 CONFIGFS_ATTR_RO(target_pr_, res_type);
2155 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
2156 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
2157
2158 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
2159         &target_pr_attr_res_holder,
2160         &target_pr_attr_res_pr_all_tgt_pts,
2161         &target_pr_attr_res_pr_generation,
2162         &target_pr_attr_res_pr_holder_tg_port,
2163         &target_pr_attr_res_pr_registered_i_pts,
2164         &target_pr_attr_res_pr_type,
2165         &target_pr_attr_res_type,
2166         &target_pr_attr_res_aptpl_active,
2167         &target_pr_attr_res_aptpl_metadata,
2168         NULL,
2169 };
2170
2171 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
2172
2173 /*  End functions for struct config_item_type tb_dev_pr_cit */
2174
2175 /*  Start functions for struct config_item_type tb_dev_cit */
2176
2177 static inline struct se_device *to_device(struct config_item *item)
2178 {
2179         return container_of(to_config_group(item), struct se_device, dev_group);
2180 }
2181
2182 static ssize_t target_dev_info_show(struct config_item *item, char *page)
2183 {
2184         struct se_device *dev = to_device(item);
2185         int bl = 0;
2186         ssize_t read_bytes = 0;
2187
2188         transport_dump_dev_state(dev, page, &bl);
2189         read_bytes += bl;
2190         read_bytes += dev->transport->show_configfs_dev_params(dev,
2191                         page+read_bytes);
2192         return read_bytes;
2193 }
2194
2195 static ssize_t target_dev_control_store(struct config_item *item,
2196                 const char *page, size_t count)
2197 {
2198         struct se_device *dev = to_device(item);
2199
2200         return dev->transport->set_configfs_dev_params(dev, page, count);
2201 }
2202
2203 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
2204 {
2205         struct se_device *dev = to_device(item);
2206
2207         if (!(dev->dev_flags & DF_USING_ALIAS))
2208                 return 0;
2209
2210         return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
2211 }
2212
2213 static ssize_t target_dev_alias_store(struct config_item *item,
2214                 const char *page, size_t count)
2215 {
2216         struct se_device *dev = to_device(item);
2217         struct se_hba *hba = dev->se_hba;
2218         ssize_t read_bytes;
2219
2220         if (count > (SE_DEV_ALIAS_LEN-1)) {
2221                 pr_err("alias count: %d exceeds"
2222                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
2223                         SE_DEV_ALIAS_LEN-1);
2224                 return -EINVAL;
2225         }
2226
2227         read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
2228         if (!read_bytes)
2229                 return -EINVAL;
2230         if (dev->dev_alias[read_bytes - 1] == '\n')
2231                 dev->dev_alias[read_bytes - 1] = '\0';
2232
2233         dev->dev_flags |= DF_USING_ALIAS;
2234
2235         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
2236                 config_item_name(&hba->hba_group.cg_item),
2237                 config_item_name(&dev->dev_group.cg_item),
2238                 dev->dev_alias);
2239
2240         return read_bytes;
2241 }
2242
2243 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
2244 {
2245         struct se_device *dev = to_device(item);
2246
2247         if (!(dev->dev_flags & DF_USING_UDEV_PATH))
2248                 return 0;
2249
2250         return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
2251 }
2252
2253 static ssize_t target_dev_udev_path_store(struct config_item *item,
2254                 const char *page, size_t count)
2255 {
2256         struct se_device *dev = to_device(item);
2257         struct se_hba *hba = dev->se_hba;
2258         ssize_t read_bytes;
2259
2260         if (count > (SE_UDEV_PATH_LEN-1)) {
2261                 pr_err("udev_path count: %d exceeds"
2262                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
2263                         SE_UDEV_PATH_LEN-1);
2264                 return -EINVAL;
2265         }
2266
2267         read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
2268                         "%s", page);
2269         if (!read_bytes)
2270                 return -EINVAL;
2271         if (dev->udev_path[read_bytes - 1] == '\n')
2272                 dev->udev_path[read_bytes - 1] = '\0';
2273
2274         dev->dev_flags |= DF_USING_UDEV_PATH;
2275
2276         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
2277                 config_item_name(&hba->hba_group.cg_item),
2278                 config_item_name(&dev->dev_group.cg_item),
2279                 dev->udev_path);
2280
2281         return read_bytes;
2282 }
2283
2284 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
2285 {
2286         struct se_device *dev = to_device(item);
2287
2288         return snprintf(page, PAGE_SIZE, "%d\n", target_dev_configured(dev));
2289 }
2290
2291 static ssize_t target_dev_enable_store(struct config_item *item,
2292                 const char *page, size_t count)
2293 {
2294         struct se_device *dev = to_device(item);
2295         char *ptr;
2296         int ret;
2297
2298         ptr = strstr(page, "1");
2299         if (!ptr) {
2300                 pr_err("For dev_enable ops, only valid value"
2301                                 " is \"1\"\n");
2302                 return -EINVAL;
2303         }
2304
2305         ret = target_configure_device(dev);
2306         if (ret)
2307                 return ret;
2308         return count;
2309 }
2310
2311 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
2312 {
2313         struct se_device *dev = to_device(item);
2314         struct config_item *lu_ci;
2315         struct t10_alua_lu_gp *lu_gp;
2316         struct t10_alua_lu_gp_member *lu_gp_mem;
2317         ssize_t len = 0;
2318
2319         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2320         if (!lu_gp_mem)
2321                 return 0;
2322
2323         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2324         lu_gp = lu_gp_mem->lu_gp;
2325         if (lu_gp) {
2326                 lu_ci = &lu_gp->lu_gp_group.cg_item;
2327                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
2328                         config_item_name(lu_ci), lu_gp->lu_gp_id);
2329         }
2330         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2331
2332         return len;
2333 }
2334
2335 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
2336                 const char *page, size_t count)
2337 {
2338         struct se_device *dev = to_device(item);
2339         struct se_hba *hba = dev->se_hba;
2340         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2341         struct t10_alua_lu_gp_member *lu_gp_mem;
2342         unsigned char buf[LU_GROUP_NAME_BUF] = { };
2343         int move = 0;
2344
2345         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2346         if (!lu_gp_mem)
2347                 return count;
2348
2349         if (count > LU_GROUP_NAME_BUF) {
2350                 pr_err("ALUA LU Group Alias too large!\n");
2351                 return -EINVAL;
2352         }
2353         memcpy(buf, page, count);
2354         /*
2355          * Any ALUA logical unit alias besides "NULL" means we will be
2356          * making a new group association.
2357          */
2358         if (strcmp(strstrip(buf), "NULL")) {
2359                 /*
2360                  * core_alua_get_lu_gp_by_name() will increment reference to
2361                  * struct t10_alua_lu_gp.  This reference is released with
2362                  * core_alua_get_lu_gp_by_name below().
2363                  */
2364                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2365                 if (!lu_gp_new)
2366                         return -ENODEV;
2367         }
2368
2369         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2370         lu_gp = lu_gp_mem->lu_gp;
2371         if (lu_gp) {
2372                 /*
2373                  * Clearing an existing lu_gp association, and replacing
2374                  * with NULL
2375                  */
2376                 if (!lu_gp_new) {
2377                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2378                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2379                                 " %hu\n",
2380                                 config_item_name(&hba->hba_group.cg_item),
2381                                 config_item_name(&dev->dev_group.cg_item),
2382                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
2383                                 lu_gp->lu_gp_id);
2384
2385                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2386                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2387
2388                         return count;
2389                 }
2390                 /*
2391                  * Removing existing association of lu_gp_mem with lu_gp
2392                  */
2393                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2394                 move = 1;
2395         }
2396         /*
2397          * Associate lu_gp_mem with lu_gp_new.
2398          */
2399         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2400         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2401
2402         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2403                 " core/alua/lu_gps/%s, ID: %hu\n",
2404                 (move) ? "Moving" : "Adding",
2405                 config_item_name(&hba->hba_group.cg_item),
2406                 config_item_name(&dev->dev_group.cg_item),
2407                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2408                 lu_gp_new->lu_gp_id);
2409
2410         core_alua_put_lu_gp_from_name(lu_gp_new);
2411         return count;
2412 }
2413
2414 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2415 {
2416         struct se_device *dev = to_device(item);
2417         struct t10_alua_lba_map *map;
2418         struct t10_alua_lba_map_member *mem;
2419         char *b = page;
2420         int bl = 0;
2421         char state;
2422
2423         spin_lock(&dev->t10_alua.lba_map_lock);
2424         if (!list_empty(&dev->t10_alua.lba_map_list))
2425             bl += sprintf(b + bl, "%u %u\n",
2426                           dev->t10_alua.lba_map_segment_size,
2427                           dev->t10_alua.lba_map_segment_multiplier);
2428         list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2429                 bl += sprintf(b + bl, "%llu %llu",
2430                               map->lba_map_first_lba, map->lba_map_last_lba);
2431                 list_for_each_entry(mem, &map->lba_map_mem_list,
2432                                     lba_map_mem_list) {
2433                         switch (mem->lba_map_mem_alua_state) {
2434                         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2435                                 state = 'O';
2436                                 break;
2437                         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2438                                 state = 'A';
2439                                 break;
2440                         case ALUA_ACCESS_STATE_STANDBY:
2441                                 state = 'S';
2442                                 break;
2443                         case ALUA_ACCESS_STATE_UNAVAILABLE:
2444                                 state = 'U';
2445                                 break;
2446                         default:
2447                                 state = '.';
2448                                 break;
2449                         }
2450                         bl += sprintf(b + bl, " %d:%c",
2451                                       mem->lba_map_mem_alua_pg_id, state);
2452                 }
2453                 bl += sprintf(b + bl, "\n");
2454         }
2455         spin_unlock(&dev->t10_alua.lba_map_lock);
2456         return bl;
2457 }
2458
2459 static ssize_t target_dev_lba_map_store(struct config_item *item,
2460                 const char *page, size_t count)
2461 {
2462         struct se_device *dev = to_device(item);
2463         struct t10_alua_lba_map *lba_map = NULL;
2464         struct list_head lba_list;
2465         char *map_entries, *orig, *ptr;
2466         char state;
2467         int pg_num = -1, pg;
2468         int ret = 0, num = 0, pg_id, alua_state;
2469         unsigned long start_lba = -1, end_lba = -1;
2470         unsigned long segment_size = -1, segment_mult = -1;
2471
2472         orig = map_entries = kstrdup(page, GFP_KERNEL);
2473         if (!map_entries)
2474                 return -ENOMEM;
2475
2476         INIT_LIST_HEAD(&lba_list);
2477         while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2478                 if (!*ptr)
2479                         continue;
2480
2481                 if (num == 0) {
2482                         if (sscanf(ptr, "%lu %lu\n",
2483                                    &segment_size, &segment_mult) != 2) {
2484                                 pr_err("Invalid line %d\n", num);
2485                                 ret = -EINVAL;
2486                                 break;
2487                         }
2488                         num++;
2489                         continue;
2490                 }
2491                 if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2492                         pr_err("Invalid line %d\n", num);
2493                         ret = -EINVAL;
2494                         break;
2495                 }
2496                 ptr = strchr(ptr, ' ');
2497                 if (!ptr) {
2498                         pr_err("Invalid line %d, missing end lba\n", num);
2499                         ret = -EINVAL;
2500                         break;
2501                 }
2502                 ptr++;
2503                 ptr = strchr(ptr, ' ');
2504                 if (!ptr) {
2505                         pr_err("Invalid line %d, missing state definitions\n",
2506                                num);
2507                         ret = -EINVAL;
2508                         break;
2509                 }
2510                 ptr++;
2511                 lba_map = core_alua_allocate_lba_map(&lba_list,
2512                                                      start_lba, end_lba);
2513                 if (IS_ERR(lba_map)) {
2514                         ret = PTR_ERR(lba_map);
2515                         break;
2516                 }
2517                 pg = 0;
2518                 while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2519                         switch (state) {
2520                         case 'O':
2521                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2522                                 break;
2523                         case 'A':
2524                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2525                                 break;
2526                         case 'S':
2527                                 alua_state = ALUA_ACCESS_STATE_STANDBY;
2528                                 break;
2529                         case 'U':
2530                                 alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2531                                 break;
2532                         default:
2533                                 pr_err("Invalid ALUA state '%c'\n", state);
2534                                 ret = -EINVAL;
2535                                 goto out;
2536                         }
2537
2538                         ret = core_alua_allocate_lba_map_mem(lba_map,
2539                                                              pg_id, alua_state);
2540                         if (ret) {
2541                                 pr_err("Invalid target descriptor %d:%c "
2542                                        "at line %d\n",
2543                                        pg_id, state, num);
2544                                 break;
2545                         }
2546                         pg++;
2547                         ptr = strchr(ptr, ' ');
2548                         if (ptr)
2549                                 ptr++;
2550                         else
2551                                 break;
2552                 }
2553                 if (pg_num == -1)
2554                     pg_num = pg;
2555                 else if (pg != pg_num) {
2556                         pr_err("Only %d from %d port groups definitions "
2557                                "at line %d\n", pg, pg_num, num);
2558                         ret = -EINVAL;
2559                         break;
2560                 }
2561                 num++;
2562         }
2563 out:
2564         if (ret) {
2565                 core_alua_free_lba_map(&lba_list);
2566                 count = ret;
2567         } else
2568                 core_alua_set_lba_map(dev, &lba_list,
2569                                       segment_size, segment_mult);
2570         kfree(orig);
2571         return count;
2572 }
2573
2574 CONFIGFS_ATTR_RO(target_dev_, info);
2575 CONFIGFS_ATTR_WO(target_dev_, control);
2576 CONFIGFS_ATTR(target_dev_, alias);
2577 CONFIGFS_ATTR(target_dev_, udev_path);
2578 CONFIGFS_ATTR(target_dev_, enable);
2579 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2580 CONFIGFS_ATTR(target_dev_, lba_map);
2581
2582 static struct configfs_attribute *target_core_dev_attrs[] = {
2583         &target_dev_attr_info,
2584         &target_dev_attr_control,
2585         &target_dev_attr_alias,
2586         &target_dev_attr_udev_path,
2587         &target_dev_attr_enable,
2588         &target_dev_attr_alua_lu_gp,
2589         &target_dev_attr_lba_map,
2590         NULL,
2591 };
2592
2593 static void target_core_dev_release(struct config_item *item)
2594 {
2595         struct config_group *dev_cg = to_config_group(item);
2596         struct se_device *dev =
2597                 container_of(dev_cg, struct se_device, dev_group);
2598
2599         target_free_device(dev);
2600 }
2601
2602 /*
2603  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2604  * within target_fabric_port_link()
2605  */
2606 struct configfs_item_operations target_core_dev_item_ops = {
2607         .release                = target_core_dev_release,
2608 };
2609
2610 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2611
2612 /* End functions for struct config_item_type tb_dev_cit */
2613
2614 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2615
2616 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2617 {
2618         return container_of(to_config_group(item), struct t10_alua_lu_gp,
2619                         lu_gp_group);
2620 }
2621
2622 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2623 {
2624         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2625
2626         if (!lu_gp->lu_gp_valid_id)
2627                 return 0;
2628         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2629 }
2630
2631 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2632                 const char *page, size_t count)
2633 {
2634         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2635         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2636         unsigned long lu_gp_id;
2637         int ret;
2638
2639         ret = kstrtoul(page, 0, &lu_gp_id);
2640         if (ret < 0) {
2641                 pr_err("kstrtoul() returned %d for"
2642                         " lu_gp_id\n", ret);
2643                 return ret;
2644         }
2645         if (lu_gp_id > 0x0000ffff) {
2646                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2647                         " 0x0000ffff\n", lu_gp_id);
2648                 return -EINVAL;
2649         }
2650
2651         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2652         if (ret < 0)
2653                 return -EINVAL;
2654
2655         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2656                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2657                 config_item_name(&alua_lu_gp_cg->cg_item),
2658                 lu_gp->lu_gp_id);
2659
2660         return count;
2661 }
2662
2663 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2664 {
2665         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2666         struct se_device *dev;
2667         struct se_hba *hba;
2668         struct t10_alua_lu_gp_member *lu_gp_mem;
2669         ssize_t len = 0, cur_len;
2670         unsigned char buf[LU_GROUP_NAME_BUF] = { };
2671
2672         spin_lock(&lu_gp->lu_gp_lock);
2673         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2674                 dev = lu_gp_mem->lu_gp_mem_dev;
2675                 hba = dev->se_hba;
2676
2677                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2678                         config_item_name(&hba->hba_group.cg_item),
2679                         config_item_name(&dev->dev_group.cg_item));
2680                 cur_len++; /* Extra byte for NULL terminator */
2681
2682                 if ((cur_len + len) > PAGE_SIZE) {
2683                         pr_warn("Ran out of lu_gp_show_attr"
2684                                 "_members buffer\n");
2685                         break;
2686                 }
2687                 memcpy(page+len, buf, cur_len);
2688                 len += cur_len;
2689         }
2690         spin_unlock(&lu_gp->lu_gp_lock);
2691
2692         return len;
2693 }
2694
2695 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2696 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2697
2698 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2699         &target_lu_gp_attr_lu_gp_id,
2700         &target_lu_gp_attr_members,
2701         NULL,
2702 };
2703
2704 static void target_core_alua_lu_gp_release(struct config_item *item)
2705 {
2706         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2707                         struct t10_alua_lu_gp, lu_gp_group);
2708
2709         core_alua_free_lu_gp(lu_gp);
2710 }
2711
2712 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2713         .release                = target_core_alua_lu_gp_release,
2714 };
2715
2716 static const struct config_item_type target_core_alua_lu_gp_cit = {
2717         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2718         .ct_attrs               = target_core_alua_lu_gp_attrs,
2719         .ct_owner               = THIS_MODULE,
2720 };
2721
2722 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2723
2724 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2725
2726 static struct config_group *target_core_alua_create_lu_gp(
2727         struct config_group *group,
2728         const char *name)
2729 {
2730         struct t10_alua_lu_gp *lu_gp;
2731         struct config_group *alua_lu_gp_cg = NULL;
2732         struct config_item *alua_lu_gp_ci = NULL;
2733
2734         lu_gp = core_alua_allocate_lu_gp(name, 0);
2735         if (IS_ERR(lu_gp))
2736                 return NULL;
2737
2738         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2739         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2740
2741         config_group_init_type_name(alua_lu_gp_cg, name,
2742                         &target_core_alua_lu_gp_cit);
2743
2744         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2745                 " Group: core/alua/lu_gps/%s\n",
2746                 config_item_name(alua_lu_gp_ci));
2747
2748         return alua_lu_gp_cg;
2749
2750 }
2751
2752 static void target_core_alua_drop_lu_gp(
2753         struct config_group *group,
2754         struct config_item *item)
2755 {
2756         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2757                         struct t10_alua_lu_gp, lu_gp_group);
2758
2759         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2760                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2761                 config_item_name(item), lu_gp->lu_gp_id);
2762         /*
2763          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2764          * -> target_core_alua_lu_gp_release()
2765          */
2766         config_item_put(item);
2767 }
2768
2769 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2770         .make_group             = &target_core_alua_create_lu_gp,
2771         .drop_item              = &target_core_alua_drop_lu_gp,
2772 };
2773
2774 static const struct config_item_type target_core_alua_lu_gps_cit = {
2775         .ct_item_ops            = NULL,
2776         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2777         .ct_owner               = THIS_MODULE,
2778 };
2779
2780 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2781
2782 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2783
2784 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2785 {
2786         return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2787                         tg_pt_gp_group);
2788 }
2789
2790 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2791                 char *page)
2792 {
2793         return sprintf(page, "%d\n",
2794                        to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2795 }
2796
2797 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2798                 const char *page, size_t count)
2799 {
2800         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2801         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2802         unsigned long tmp;
2803         int new_state, ret;
2804
2805         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2806                 pr_err("Unable to do implicit ALUA on invalid tg_pt_gp ID\n");
2807                 return -EINVAL;
2808         }
2809         if (!target_dev_configured(dev)) {
2810                 pr_err("Unable to set alua_access_state while device is"
2811                        " not configured\n");
2812                 return -ENODEV;
2813         }
2814
2815         ret = kstrtoul(page, 0, &tmp);
2816         if (ret < 0) {
2817                 pr_err("Unable to extract new ALUA access state from"
2818                                 " %s\n", page);
2819                 return ret;
2820         }
2821         new_state = (int)tmp;
2822
2823         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2824                 pr_err("Unable to process implicit configfs ALUA"
2825                         " transition while TPGS_IMPLICIT_ALUA is disabled\n");
2826                 return -EINVAL;
2827         }
2828         if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2829             new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2830                 /* LBA DEPENDENT is only allowed with implicit ALUA */
2831                 pr_err("Unable to process implicit configfs ALUA transition"
2832                        " while explicit ALUA management is enabled\n");
2833                 return -EINVAL;
2834         }
2835
2836         ret = core_alua_do_port_transition(tg_pt_gp, dev,
2837                                         NULL, NULL, new_state, 0);
2838         return (!ret) ? count : -EINVAL;
2839 }
2840
2841 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2842                 char *page)
2843 {
2844         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2845         return sprintf(page, "%s\n",
2846                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2847 }
2848
2849 static ssize_t target_tg_pt_gp_alua_access_status_store(
2850                 struct config_item *item, const char *page, size_t count)
2851 {
2852         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2853         unsigned long tmp;
2854         int new_status, ret;
2855
2856         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2857                 pr_err("Unable to set ALUA access status on invalid tg_pt_gp ID\n");
2858                 return -EINVAL;
2859         }
2860
2861         ret = kstrtoul(page, 0, &tmp);
2862         if (ret < 0) {
2863                 pr_err("Unable to extract new ALUA access status"
2864                                 " from %s\n", page);
2865                 return ret;
2866         }
2867         new_status = (int)tmp;
2868
2869         if ((new_status != ALUA_STATUS_NONE) &&
2870             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2871             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2872                 pr_err("Illegal ALUA access status: 0x%02x\n",
2873                                 new_status);
2874                 return -EINVAL;
2875         }
2876
2877         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2878         return count;
2879 }
2880
2881 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2882                 char *page)
2883 {
2884         return core_alua_show_access_type(to_tg_pt_gp(item), page);
2885 }
2886
2887 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2888                 const char *page, size_t count)
2889 {
2890         return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2891 }
2892
2893 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
2894 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
2895                 struct config_item *item, char *p)                      \
2896 {                                                                       \
2897         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2898         return sprintf(p, "%d\n",                                       \
2899                 !!(t->tg_pt_gp_alua_supported_states & _bit));          \
2900 }                                                                       \
2901                                                                         \
2902 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
2903                 struct config_item *item, const char *p, size_t c)      \
2904 {                                                                       \
2905         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2906         unsigned long tmp;                                              \
2907         int ret;                                                        \
2908                                                                         \
2909         if (!t->tg_pt_gp_valid_id) {                                    \
2910                 pr_err("Unable to set " #_name " ALUA state on invalid tg_pt_gp ID\n"); \
2911                 return -EINVAL;                                         \
2912         }                                                               \
2913                                                                         \
2914         ret = kstrtoul(p, 0, &tmp);                                     \
2915         if (ret < 0) {                                                  \
2916                 pr_err("Invalid value '%s', must be '0' or '1'\n", p);  \
2917                 return -EINVAL;                                         \
2918         }                                                               \
2919         if (tmp > 1) {                                                  \
2920                 pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2921                 return -EINVAL;                                         \
2922         }                                                               \
2923         if (tmp)                                                        \
2924                 t->tg_pt_gp_alua_supported_states |= _bit;              \
2925         else                                                            \
2926                 t->tg_pt_gp_alua_supported_states &= ~_bit;             \
2927                                                                         \
2928         return c;                                                       \
2929 }
2930
2931 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2932 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2933 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2934 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2935 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2936 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2937 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2938
2939 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2940                 struct config_item *item, char *page)
2941 {
2942         return sprintf(page, "%d\n",
2943                 to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2944 }
2945
2946 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2947                 struct config_item *item, const char *page, size_t count)
2948 {
2949         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2950         unsigned long tmp;
2951         int ret;
2952
2953         ret = kstrtoul(page, 0, &tmp);
2954         if (ret < 0) {
2955                 pr_err("Unable to extract alua_write_metadata\n");
2956                 return ret;
2957         }
2958
2959         if ((tmp != 0) && (tmp != 1)) {
2960                 pr_err("Illegal value for alua_write_metadata:"
2961                         " %lu\n", tmp);
2962                 return -EINVAL;
2963         }
2964         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2965
2966         return count;
2967 }
2968
2969 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2970                 char *page)
2971 {
2972         return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2973 }
2974
2975 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2976                 const char *page, size_t count)
2977 {
2978         return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2979                         count);
2980 }
2981
2982 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2983                 char *page)
2984 {
2985         return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2986 }
2987
2988 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
2989                 const char *page, size_t count)
2990 {
2991         return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
2992                         count);
2993 }
2994
2995 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
2996                 struct config_item *item, char *page)
2997 {
2998         return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
2999 }
3000
3001 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
3002                 struct config_item *item, const char *page, size_t count)
3003 {
3004         return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
3005                         count);
3006 }
3007
3008 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
3009                 char *page)
3010 {
3011         return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
3012 }
3013
3014 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
3015                 const char *page, size_t count)
3016 {
3017         return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
3018 }
3019
3020 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
3021                 char *page)
3022 {
3023         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3024
3025         if (!tg_pt_gp->tg_pt_gp_valid_id)
3026                 return 0;
3027         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
3028 }
3029
3030 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
3031                 const char *page, size_t count)
3032 {
3033         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3034         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3035         unsigned long tg_pt_gp_id;
3036         int ret;
3037
3038         ret = kstrtoul(page, 0, &tg_pt_gp_id);
3039         if (ret < 0) {
3040                 pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
3041                        page);
3042                 return ret;
3043         }
3044         if (tg_pt_gp_id > 0x0000ffff) {
3045                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
3046                        tg_pt_gp_id);
3047                 return -EINVAL;
3048         }
3049
3050         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
3051         if (ret < 0)
3052                 return -EINVAL;
3053
3054         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
3055                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
3056                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
3057                 tg_pt_gp->tg_pt_gp_id);
3058
3059         return count;
3060 }
3061
3062 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
3063                 char *page)
3064 {
3065         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3066         struct se_lun *lun;
3067         ssize_t len = 0, cur_len;
3068         unsigned char buf[TG_PT_GROUP_NAME_BUF] = { };
3069
3070         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
3071         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
3072                         lun_tg_pt_gp_link) {
3073                 struct se_portal_group *tpg = lun->lun_tpg;
3074
3075                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
3076                         "/%s\n", tpg->se_tpg_tfo->fabric_name,
3077                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
3078                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
3079                         config_item_name(&lun->lun_group.cg_item));
3080                 cur_len++; /* Extra byte for NULL terminator */
3081
3082                 if ((cur_len + len) > PAGE_SIZE) {
3083                         pr_warn("Ran out of lu_gp_show_attr"
3084                                 "_members buffer\n");
3085                         break;
3086                 }
3087                 memcpy(page+len, buf, cur_len);
3088                 len += cur_len;
3089         }
3090         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
3091
3092         return len;
3093 }
3094
3095 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
3096 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
3097 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
3098 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
3099 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
3100 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
3101 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
3102 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
3103 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
3104 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
3105 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
3106 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
3107 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
3108 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
3109 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
3110 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
3111 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
3112
3113 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
3114         &target_tg_pt_gp_attr_alua_access_state,
3115         &target_tg_pt_gp_attr_alua_access_status,
3116         &target_tg_pt_gp_attr_alua_access_type,
3117         &target_tg_pt_gp_attr_alua_support_transitioning,
3118         &target_tg_pt_gp_attr_alua_support_offline,
3119         &target_tg_pt_gp_attr_alua_support_lba_dependent,
3120         &target_tg_pt_gp_attr_alua_support_unavailable,
3121         &target_tg_pt_gp_attr_alua_support_standby,
3122         &target_tg_pt_gp_attr_alua_support_active_nonoptimized,
3123         &target_tg_pt_gp_attr_alua_support_active_optimized,
3124         &target_tg_pt_gp_attr_alua_write_metadata,
3125         &target_tg_pt_gp_attr_nonop_delay_msecs,
3126         &target_tg_pt_gp_attr_trans_delay_msecs,
3127         &target_tg_pt_gp_attr_implicit_trans_secs,
3128         &target_tg_pt_gp_attr_preferred,
3129         &target_tg_pt_gp_attr_tg_pt_gp_id,
3130         &target_tg_pt_gp_attr_members,
3131         NULL,
3132 };
3133
3134 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
3135 {
3136         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3137                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3138
3139         core_alua_free_tg_pt_gp(tg_pt_gp);
3140 }
3141
3142 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
3143         .release                = target_core_alua_tg_pt_gp_release,
3144 };
3145
3146 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
3147         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
3148         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
3149         .ct_owner               = THIS_MODULE,
3150 };
3151
3152 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
3153
3154 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3155
3156 static struct config_group *target_core_alua_create_tg_pt_gp(
3157         struct config_group *group,
3158         const char *name)
3159 {
3160         struct t10_alua *alua = container_of(group, struct t10_alua,
3161                                         alua_tg_pt_gps_group);
3162         struct t10_alua_tg_pt_gp *tg_pt_gp;
3163         struct config_group *alua_tg_pt_gp_cg = NULL;
3164         struct config_item *alua_tg_pt_gp_ci = NULL;
3165
3166         tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
3167         if (!tg_pt_gp)
3168                 return NULL;
3169
3170         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3171         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
3172
3173         config_group_init_type_name(alua_tg_pt_gp_cg, name,
3174                         &target_core_alua_tg_pt_gp_cit);
3175
3176         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
3177                 " Group: alua/tg_pt_gps/%s\n",
3178                 config_item_name(alua_tg_pt_gp_ci));
3179
3180         return alua_tg_pt_gp_cg;
3181 }
3182
3183 static void target_core_alua_drop_tg_pt_gp(
3184         struct config_group *group,
3185         struct config_item *item)
3186 {
3187         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3188                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3189
3190         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
3191                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
3192                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
3193         /*
3194          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
3195          * -> target_core_alua_tg_pt_gp_release().
3196          */
3197         config_item_put(item);
3198 }
3199
3200 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
3201         .make_group             = &target_core_alua_create_tg_pt_gp,
3202         .drop_item              = &target_core_alua_drop_tg_pt_gp,
3203 };
3204
3205 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
3206
3207 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3208
3209 /* Start functions for struct config_item_type target_core_alua_cit */
3210
3211 /*
3212  * target_core_alua_cit is a ConfigFS group that lives under
3213  * /sys/kernel/config/target/core/alua.  There are default groups
3214  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
3215  * target_core_alua_cit in target_core_init_configfs() below.
3216  */
3217 static const struct config_item_type target_core_alua_cit = {
3218         .ct_item_ops            = NULL,
3219         .ct_attrs               = NULL,
3220         .ct_owner               = THIS_MODULE,
3221 };
3222
3223 /* End functions for struct config_item_type target_core_alua_cit */
3224
3225 /* Start functions for struct config_item_type tb_dev_stat_cit */
3226
3227 static struct config_group *target_core_stat_mkdir(
3228         struct config_group *group,
3229         const char *name)
3230 {
3231         return ERR_PTR(-ENOSYS);
3232 }
3233
3234 static void target_core_stat_rmdir(
3235         struct config_group *group,
3236         struct config_item *item)
3237 {
3238         return;
3239 }
3240
3241 static struct configfs_group_operations target_core_stat_group_ops = {
3242         .make_group             = &target_core_stat_mkdir,
3243         .drop_item              = &target_core_stat_rmdir,
3244 };
3245
3246 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
3247
3248 /* End functions for struct config_item_type tb_dev_stat_cit */
3249
3250 /* Start functions for struct config_item_type target_core_hba_cit */
3251
3252 static struct config_group *target_core_make_subdev(
3253         struct config_group *group,
3254         const char *name)
3255 {
3256         struct t10_alua_tg_pt_gp *tg_pt_gp;
3257         struct config_item *hba_ci = &group->cg_item;
3258         struct se_hba *hba = item_to_hba(hba_ci);
3259         struct target_backend *tb = hba->backend;
3260         struct se_device *dev;
3261         int errno = -ENOMEM, ret;
3262
3263         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
3264         if (ret)
3265                 return ERR_PTR(ret);
3266
3267         dev = target_alloc_device(hba, name);
3268         if (!dev)
3269                 goto out_unlock;
3270
3271         config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
3272
3273         config_group_init_type_name(&dev->dev_action_group, "action",
3274                         &tb->tb_dev_action_cit);
3275         configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
3276
3277         config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
3278                         &tb->tb_dev_attrib_cit);
3279         configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
3280
3281         config_group_init_type_name(&dev->dev_pr_group, "pr",
3282                         &tb->tb_dev_pr_cit);
3283         configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
3284
3285         config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
3286                         &tb->tb_dev_wwn_cit);
3287         configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
3288                         &dev->dev_group);
3289
3290         config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
3291                         "alua", &tb->tb_dev_alua_tg_pt_gps_cit);
3292         configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
3293                         &dev->dev_group);
3294
3295         config_group_init_type_name(&dev->dev_stat_grps.stat_group,
3296                         "statistics", &tb->tb_dev_stat_cit);
3297         configfs_add_default_group(&dev->dev_stat_grps.stat_group,
3298                         &dev->dev_group);
3299
3300         /*
3301          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
3302          */
3303         tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
3304         if (!tg_pt_gp)
3305                 goto out_free_device;
3306         dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
3307
3308         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
3309                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
3310         configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
3311                         &dev->t10_alua.alua_tg_pt_gps_group);
3312
3313         /*
3314          * Add core/$HBA/$DEV/statistics/ default groups
3315          */
3316         target_stat_setup_dev_default_groups(dev);
3317
3318         mutex_unlock(&hba->hba_access_mutex);
3319         return &dev->dev_group;
3320
3321 out_free_device:
3322         target_free_device(dev);
3323 out_unlock:
3324         mutex_unlock(&hba->hba_access_mutex);
3325         return ERR_PTR(errno);
3326 }
3327
3328 static void target_core_drop_subdev(
3329         struct config_group *group,
3330         struct config_item *item)
3331 {
3332         struct config_group *dev_cg = to_config_group(item);
3333         struct se_device *dev =
3334                 container_of(dev_cg, struct se_device, dev_group);
3335         struct se_hba *hba;
3336
3337         hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3338
3339         mutex_lock(&hba->hba_access_mutex);
3340
3341         configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3342         configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3343
3344         /*
3345          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3346          * directly from target_core_alua_tg_pt_gp_release().
3347          */
3348         dev->t10_alua.default_tg_pt_gp = NULL;
3349
3350         configfs_remove_default_groups(dev_cg);
3351
3352         /*
3353          * se_dev is released from target_core_dev_item_ops->release()
3354          */
3355         config_item_put(item);
3356         mutex_unlock(&hba->hba_access_mutex);
3357 }
3358
3359 static struct configfs_group_operations target_core_hba_group_ops = {
3360         .make_group             = target_core_make_subdev,
3361         .drop_item              = target_core_drop_subdev,
3362 };
3363
3364
3365 static inline struct se_hba *to_hba(struct config_item *item)
3366 {
3367         return container_of(to_config_group(item), struct se_hba, hba_group);
3368 }
3369
3370 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3371 {
3372         struct se_hba *hba = to_hba(item);
3373
3374         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3375                         hba->hba_id, hba->backend->ops->name,
3376                         TARGET_CORE_VERSION);
3377 }
3378
3379 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3380 {
3381         struct se_hba *hba = to_hba(item);
3382         int hba_mode = 0;
3383
3384         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3385                 hba_mode = 1;
3386
3387         return sprintf(page, "%d\n", hba_mode);
3388 }
3389
3390 static ssize_t target_hba_mode_store(struct config_item *item,
3391                 const char *page, size_t count)
3392 {
3393         struct se_hba *hba = to_hba(item);
3394         unsigned long mode_flag;
3395         int ret;
3396
3397         if (hba->backend->ops->pmode_enable_hba == NULL)
3398                 return -EINVAL;
3399
3400         ret = kstrtoul(page, 0, &mode_flag);
3401         if (ret < 0) {
3402                 pr_err("Unable to extract hba mode flag: %d\n", ret);
3403                 return ret;
3404         }
3405
3406         if (hba->dev_count) {
3407                 pr_err("Unable to set hba_mode with active devices\n");
3408                 return -EINVAL;
3409         }
3410
3411         ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3412         if (ret < 0)
3413                 return -EINVAL;
3414         if (ret > 0)
3415                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3416         else if (ret == 0)
3417                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3418
3419         return count;
3420 }
3421
3422 CONFIGFS_ATTR_RO(target_, hba_info);
3423 CONFIGFS_ATTR(target_, hba_mode);
3424
3425 static void target_core_hba_release(struct config_item *item)
3426 {
3427         struct se_hba *hba = container_of(to_config_group(item),
3428                                 struct se_hba, hba_group);
3429         core_delete_hba(hba);
3430 }
3431
3432 static struct configfs_attribute *target_core_hba_attrs[] = {
3433         &target_attr_hba_info,
3434         &target_attr_hba_mode,
3435         NULL,
3436 };
3437
3438 static struct configfs_item_operations target_core_hba_item_ops = {
3439         .release                = target_core_hba_release,
3440 };
3441
3442 static const struct config_item_type target_core_hba_cit = {
3443         .ct_item_ops            = &target_core_hba_item_ops,
3444         .ct_group_ops           = &target_core_hba_group_ops,
3445         .ct_attrs               = target_core_hba_attrs,
3446         .ct_owner               = THIS_MODULE,
3447 };
3448
3449 static struct config_group *target_core_call_addhbatotarget(
3450         struct config_group *group,
3451         const char *name)
3452 {
3453         char *se_plugin_str, *str, *str2;
3454         struct se_hba *hba;
3455         char buf[TARGET_CORE_NAME_MAX_LEN] = { };
3456         unsigned long plugin_dep_id = 0;
3457         int ret;
3458
3459         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3460                 pr_err("Passed *name strlen(): %d exceeds"
3461                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3462                         TARGET_CORE_NAME_MAX_LEN);
3463                 return ERR_PTR(-ENAMETOOLONG);
3464         }
3465         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3466
3467         str = strstr(buf, "_");
3468         if (!str) {
3469                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3470                 return ERR_PTR(-EINVAL);
3471         }
3472         se_plugin_str = buf;
3473         /*
3474          * Special case for subsystem plugins that have "_" in their names.
3475          * Namely rd_direct and rd_mcp..
3476          */
3477         str2 = strstr(str+1, "_");
3478         if (str2) {
3479                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3480                 str2++; /* Skip to start of plugin dependent ID */
3481                 str = str2;
3482         } else {
3483                 *str = '\0'; /* Terminate for *se_plugin_str */
3484                 str++; /* Skip to start of plugin dependent ID */
3485         }
3486
3487         ret = kstrtoul(str, 0, &plugin_dep_id);
3488         if (ret < 0) {
3489                 pr_err("kstrtoul() returned %d for"
3490                                 " plugin_dep_id\n", ret);
3491                 return ERR_PTR(ret);
3492         }
3493         /*
3494          * Load up TCM subsystem plugins if they have not already been loaded.
3495          */
3496         transport_subsystem_check_init();
3497
3498         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3499         if (IS_ERR(hba))
3500                 return ERR_CAST(hba);
3501
3502         config_group_init_type_name(&hba->hba_group, name,
3503                         &target_core_hba_cit);
3504
3505         return &hba->hba_group;
3506 }
3507
3508 static void target_core_call_delhbafromtarget(
3509         struct config_group *group,
3510         struct config_item *item)
3511 {
3512         /*
3513          * core_delete_hba() is called from target_core_hba_item_ops->release()
3514          * -> target_core_hba_release()
3515          */
3516         config_item_put(item);
3517 }
3518
3519 static struct configfs_group_operations target_core_group_ops = {
3520         .make_group     = target_core_call_addhbatotarget,
3521         .drop_item      = target_core_call_delhbafromtarget,
3522 };
3523
3524 static const struct config_item_type target_core_cit = {
3525         .ct_item_ops    = NULL,
3526         .ct_group_ops   = &target_core_group_ops,
3527         .ct_attrs       = NULL,
3528         .ct_owner       = THIS_MODULE,
3529 };
3530
3531 /* Stop functions for struct config_item_type target_core_hba_cit */
3532
3533 void target_setup_backend_cits(struct target_backend *tb)
3534 {
3535         target_core_setup_dev_cit(tb);
3536         target_core_setup_dev_action_cit(tb);
3537         target_core_setup_dev_attrib_cit(tb);
3538         target_core_setup_dev_pr_cit(tb);
3539         target_core_setup_dev_wwn_cit(tb);
3540         target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3541         target_core_setup_dev_stat_cit(tb);
3542 }
3543
3544 static void target_init_dbroot(void)
3545 {
3546         struct file *fp;
3547
3548         snprintf(db_root_stage, DB_ROOT_LEN, DB_ROOT_PREFERRED);
3549         fp = filp_open(db_root_stage, O_RDONLY, 0);
3550         if (IS_ERR(fp)) {
3551                 pr_err("db_root: cannot open: %s\n", db_root_stage);
3552                 return;
3553         }
3554         if (!S_ISDIR(file_inode(fp)->i_mode)) {
3555                 filp_close(fp, NULL);
3556                 pr_err("db_root: not a valid directory: %s\n", db_root_stage);
3557                 return;
3558         }
3559         filp_close(fp, NULL);
3560
3561         strncpy(db_root, db_root_stage, DB_ROOT_LEN);
3562         pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
3563 }
3564
3565 static int __init target_core_init_configfs(void)
3566 {
3567         struct configfs_subsystem *subsys = &target_core_fabrics;
3568         struct t10_alua_lu_gp *lu_gp;
3569         int ret;
3570
3571         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3572                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3573                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3574
3575         config_group_init(&subsys->su_group);
3576         mutex_init(&subsys->su_mutex);
3577
3578         ret = init_se_kmem_caches();
3579         if (ret < 0)
3580                 return ret;
3581         /*
3582          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3583          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3584          */
3585         config_group_init_type_name(&target_core_hbagroup, "core",
3586                         &target_core_cit);
3587         configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3588
3589         /*
3590          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3591          */
3592         config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3593         configfs_add_default_group(&alua_group, &target_core_hbagroup);
3594
3595         /*
3596          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3597          * groups under /sys/kernel/config/target/core/alua/
3598          */
3599         config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3600                         &target_core_alua_lu_gps_cit);
3601         configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3602
3603         /*
3604          * Add core/alua/lu_gps/default_lu_gp
3605          */
3606         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3607         if (IS_ERR(lu_gp)) {
3608                 ret = -ENOMEM;
3609                 goto out_global;
3610         }
3611
3612         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3613                                 &target_core_alua_lu_gp_cit);
3614         configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3615
3616         default_lu_gp = lu_gp;
3617
3618         /*
3619          * Register the target_core_mod subsystem with configfs.
3620          */
3621         ret = configfs_register_subsystem(subsys);
3622         if (ret < 0) {
3623                 pr_err("Error %d while registering subsystem %s\n",
3624                         ret, subsys->su_group.cg_item.ci_namebuf);
3625                 goto out_global;
3626         }
3627         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3628                 " Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3629                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3630         /*
3631          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3632          */
3633         ret = rd_module_init();
3634         if (ret < 0)
3635                 goto out;
3636
3637         ret = core_dev_setup_virtual_lun0();
3638         if (ret < 0)
3639                 goto out;
3640
3641         ret = target_xcopy_setup_pt();
3642         if (ret < 0)
3643                 goto out;
3644
3645         target_init_dbroot();
3646
3647         return 0;
3648
3649 out:
3650         configfs_unregister_subsystem(subsys);
3651         core_dev_release_virtual_lun0();
3652         rd_module_exit();
3653 out_global:
3654         if (default_lu_gp) {
3655                 core_alua_free_lu_gp(default_lu_gp);
3656                 default_lu_gp = NULL;
3657         }
3658         release_se_kmem_caches();
3659         return ret;
3660 }
3661
3662 static void __exit target_core_exit_configfs(void)
3663 {
3664         configfs_remove_default_groups(&alua_lu_gps_group);
3665         configfs_remove_default_groups(&alua_group);
3666         configfs_remove_default_groups(&target_core_hbagroup);
3667
3668         /*
3669          * We expect subsys->su_group.default_groups to be released
3670          * by configfs subsystem provider logic..
3671          */
3672         configfs_unregister_subsystem(&target_core_fabrics);
3673
3674         core_alua_free_lu_gp(default_lu_gp);
3675         default_lu_gp = NULL;
3676
3677         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3678                         " Infrastructure\n");
3679
3680         core_dev_release_virtual_lun0();
3681         rd_module_exit();
3682         target_xcopy_release_pt();
3683         release_se_kmem_caches();
3684 }
3685
3686 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3687 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3688 MODULE_LICENSE("GPL");
3689
3690 module_init(target_core_init_configfs);
3691 module_exit(target_core_exit_configfs);