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 unsigned int target_devices;
  76 static DEFINE_MUTEX(target_devices_lock);
  77
  78 static inline struct se_hba *
  79 item_to_hba(struct config_item *item)
  80 {
  81         return container_of(to_config_group(item), struct se_hba, hba_group);
  82 }
  83
  84 /*
  85  * Attributes for /sys/kernel/config/target/
  86  */
  87 static ssize_t target_core_item_version_show(struct config_item *item,
  88                 char *page)
  89 {
  90         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  91                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
  92                 utsname()->sysname, utsname()->machine);
  93 }
  94
  95 CONFIGFS_ATTR_RO(target_core_item_, version);
  96
  97 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
  98 static char db_root_stage[DB_ROOT_LEN];
  99
 100 static ssize_t target_core_item_dbroot_show(struct config_item *item,
 101                                             char *page)
 102 {
 103         return sprintf(page, "%s\n", db_root);
 104 }
 105
 106 static ssize_t target_core_item_dbroot_store(struct config_item *item,
 107                                         const char *page, size_t count)
 108 {
 109         ssize_t read_bytes;
 110         struct file *fp;
 111         ssize_t r = -EINVAL;
 112
 113         mutex_lock(&target_devices_lock);
 114         if (target_devices) {
 115                 pr_err("db_root: cannot be changed because it's in use\n");
 116                 goto unlock;
 117         }
 118
 119         if (count > (DB_ROOT_LEN - 1)) {
 120                 pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
 121                        (int)count, DB_ROOT_LEN - 1);
 122                 goto unlock;
 123         }
 124
 125         read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
 126         if (!read_bytes)
 127                 goto unlock;
 128
 129         if (db_root_stage[read_bytes - 1] == '\n')
 130                 db_root_stage[read_bytes - 1] = '\0';
 131
 132         /* validate new db root before accepting it */
 133         fp = filp_open(db_root_stage, O_RDONLY, 0);
 134         if (IS_ERR(fp)) {
 135                 pr_err("db_root: cannot open: %s\n", db_root_stage);
 136                 goto unlock;
 137         }
 138         if (!S_ISDIR(file_inode(fp)->i_mode)) {
 139                 filp_close(fp, NULL);
 140                 pr_err("db_root: not a directory: %s\n", db_root_stage);
 141                 goto unlock;
 142         }
 143         filp_close(fp, NULL);
 144
 145         strncpy(db_root, db_root_stage, read_bytes);
 146         pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
 147
 148         r = read_bytes;
 149
 150 unlock:
 151         mutex_unlock(&target_devices_lock);
 152         return r;
 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->tf_tpg_base_cit.ct_attrs);
 494                         kfree(t);
 495                         return;
 496                 }
 497         }
 498         mutex_unlock(&g_tf_lock);
 499 }
 500 EXPORT_SYMBOL(target_unregister_template);
 501
 502 /*##############################################################################
 503 // Stop functions called by external Target Fabrics Modules
 504 //############################################################################*/
 505
 506 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
 507 {
 508         return container_of(to_config_group(item), struct se_dev_attrib,
 509                         da_group);
 510 }
 511
 512 /* Start functions for struct config_item_type tb_dev_attrib_cit */
 513 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
 514 static ssize_t _name##_show(struct config_item *item, char *page)       \
 515 {                                                                       \
 516         return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
 517 }
 518
 519 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
 520 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
 521 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
 522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
 523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
 524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
 525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
 526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
 527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
 528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
 529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
 530 DEF_CONFIGFS_ATTRIB_SHOW(emulate_pr);
 531 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
 532 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
 533 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
 534 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
 535 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
 536 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
 537 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
 538 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
 539 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
 540 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
 541 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
 542 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
 543 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
 544 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
 545 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
 546 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
 547 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
 548 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
 549 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
 550
 551 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
 552 static ssize_t _name##_store(struct config_item *item, const char *page,\
 553                 size_t count)                                           \
 554 {                                                                       \
 555         struct se_dev_attrib *da = to_attrib(item);                     \
 556         u32 val;                                                        \
 557         int ret;                                                        \
 558                                                                         \
 559         ret = kstrtou32(page, 0, &val);                                 \
 560         if (ret < 0)                                                    \
 561                 return ret;                                             \
 562         da->_name = val;                                                \
 563         return count;                                                   \
 564 }
 565
 566 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
 567 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
 568 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
 569 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
 570 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
 571
 572 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
 573 static ssize_t _name##_store(struct config_item *item, const char *page,        \
 574                 size_t count)                                           \
 575 {                                                                       \
 576         struct se_dev_attrib *da = to_attrib(item);                     \
 577         bool flag;                                                      \
 578         int ret;                                                        \
 579                                                                         \
 580         ret = strtobool(page, &flag);                                   \
 581         if (ret < 0)                                                    \
 582                 return ret;                                             \
 583         da->_name = flag;                                               \
 584         return count;                                                   \
 585 }
 586
 587 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
 588 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
 589 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
 590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_pr);
 591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
 592 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
 593
 594 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
 595 static ssize_t _name##_store(struct config_item *item, const char *page,\
 596                 size_t count)                                           \
 597 {                                                                       \
 598         printk_once(KERN_WARNING                                        \
 599                 "ignoring deprecated %s attribute\n",                   \
 600                 __stringify(_name));                                    \
 601         return count;                                                   \
 602 }
 603
 604 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
 605 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
 606
 607 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 608 {
 609         const char *configname;
 610
 611         configname = config_item_name(&dev->dev_group.cg_item);
 612         if (strlen(configname) >= INQUIRY_MODEL_LEN) {
 613                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 614                         "INQUIRY_MODEL, truncating to 15 characters\n", dev,
 615                         configname);
 616         }
 617         /*
 618          * XXX We can't use sizeof(dev->t10_wwn.model) (INQUIRY_MODEL_LEN + 1)
 619          * here without potentially breaking existing setups, so continue to
 620          * truncate one byte shorter than what can be carried in INQUIRY.
 621          */
 622         strlcpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
 623 }
 624
 625 static ssize_t emulate_model_alias_store(struct config_item *item,
 626                 const char *page, size_t count)
 627 {
 628         struct se_dev_attrib *da = to_attrib(item);
 629         struct se_device *dev = da->da_dev;
 630         bool flag;
 631         int ret;
 632
 633         if (dev->export_count) {
 634                 pr_err("dev[%p]: Unable to change model alias"
 635                         " while export_count is %d\n",
 636                         dev, dev->export_count);
 637                 return -EINVAL;
 638         }
 639
 640         ret = strtobool(page, &flag);
 641         if (ret < 0)
 642                 return ret;
 643
 644         BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
 645         if (flag) {
 646                 dev_set_t10_wwn_model_alias(dev);
 647         } else {
 648                 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 649                         sizeof(dev->t10_wwn.model));
 650         }
 651         da->emulate_model_alias = flag;
 652         return count;
 653 }
 654
 655 static ssize_t emulate_write_cache_store(struct config_item *item,
 656                 const char *page, size_t count)
 657 {
 658         struct se_dev_attrib *da = to_attrib(item);
 659         bool flag;
 660         int ret;
 661
 662         ret = strtobool(page, &flag);
 663         if (ret < 0)
 664                 return ret;
 665
 666         if (flag && da->da_dev->transport->get_write_cache) {
 667                 pr_err("emulate_write_cache not supported for this device\n");
 668                 return -EINVAL;
 669         }
 670
 671         da->emulate_write_cache = flag;
 672         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 673                         da->da_dev, flag);
 674         return count;
 675 }
 676
 677 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
 678                 const char *page, size_t count)
 679 {
 680         struct se_dev_attrib *da = to_attrib(item);
 681         u32 val;
 682         int ret;
 683
 684         ret = kstrtou32(page, 0, &val);
 685         if (ret < 0)
 686                 return ret;
 687
 688         if (val != TARGET_UA_INTLCK_CTRL_CLEAR
 689          && val != TARGET_UA_INTLCK_CTRL_NO_CLEAR
 690          && val != TARGET_UA_INTLCK_CTRL_ESTABLISH_UA) {
 691                 pr_err("Illegal value %d\n", val);
 692                 return -EINVAL;
 693         }
 694
 695         if (da->da_dev->export_count) {
 696                 pr_err("dev[%p]: Unable to change SE Device"
 697                         " UA_INTRLCK_CTRL while export_count is %d\n",
 698                         da->da_dev, da->da_dev->export_count);
 699                 return -EINVAL;
 700         }
 701         da->emulate_ua_intlck_ctrl = val;
 702         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 703                 da->da_dev, val);
 704         return count;
 705 }
 706
 707 static ssize_t emulate_tas_store(struct config_item *item,
 708                 const char *page, size_t count)
 709 {
 710         struct se_dev_attrib *da = to_attrib(item);
 711         bool flag;
 712         int ret;
 713
 714         ret = strtobool(page, &flag);
 715         if (ret < 0)
 716                 return ret;
 717
 718         if (da->da_dev->export_count) {
 719                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 720                         " export_count is %d\n",
 721                         da->da_dev, da->da_dev->export_count);
 722                 return -EINVAL;
 723         }
 724         da->emulate_tas = flag;
 725         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 726                 da->da_dev, flag ? "Enabled" : "Disabled");
 727
 728         return count;
 729 }
 730
 731 static ssize_t emulate_tpu_store(struct config_item *item,
 732                 const char *page, size_t count)
 733 {
 734         struct se_dev_attrib *da = to_attrib(item);
 735         struct se_device *dev = da->da_dev;
 736         bool flag;
 737         int ret;
 738
 739         ret = strtobool(page, &flag);
 740         if (ret < 0)
 741                 return ret;
 742
 743         /*
 744          * We expect this value to be non-zero when generic Block Layer
 745          * Discard supported is detected iblock_create_virtdevice().
 746          */
 747         if (flag && !da->max_unmap_block_desc_count) {
 748                 if (!dev->transport->configure_unmap ||
 749                     !dev->transport->configure_unmap(dev)) {
 750                         pr_err("Generic Block Discard not supported\n");
 751                         return -ENOSYS;
 752                 }
 753         }
 754
 755         da->emulate_tpu = flag;
 756         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 757                 da->da_dev, flag);
 758         return count;
 759 }
 760
 761 static ssize_t emulate_tpws_store(struct config_item *item,
 762                 const char *page, size_t count)
 763 {
 764         struct se_dev_attrib *da = to_attrib(item);
 765         struct se_device *dev = da->da_dev;
 766         bool flag;
 767         int ret;
 768
 769         ret = strtobool(page, &flag);
 770         if (ret < 0)
 771                 return ret;
 772
 773         /*
 774          * We expect this value to be non-zero when generic Block Layer
 775          * Discard supported is detected iblock_create_virtdevice().
 776          */
 777         if (flag && !da->max_unmap_block_desc_count) {
 778                 if (!dev->transport->configure_unmap ||
 779                     !dev->transport->configure_unmap(dev)) {
 780                         pr_err("Generic Block Discard not supported\n");
 781                         return -ENOSYS;
 782                 }
 783         }
 784
 785         da->emulate_tpws = flag;
 786         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 787                                 da->da_dev, flag);
 788         return count;
 789 }
 790
 791 static ssize_t pi_prot_type_store(struct config_item *item,
 792                 const char *page, size_t count)
 793 {
 794         struct se_dev_attrib *da = to_attrib(item);
 795         int old_prot = da->pi_prot_type, ret;
 796         struct se_device *dev = da->da_dev;
 797         u32 flag;
 798
 799         ret = kstrtou32(page, 0, &flag);
 800         if (ret < 0)
 801                 return ret;
 802
 803         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 804                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 805                 return -EINVAL;
 806         }
 807         if (flag == 2) {
 808                 pr_err("DIF TYPE2 protection currently not supported\n");
 809                 return -ENOSYS;
 810         }
 811         if (da->hw_pi_prot_type) {
 812                 pr_warn("DIF protection enabled on underlying hardware,"
 813                         " ignoring\n");
 814                 return count;
 815         }
 816         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 817                 /* 0 is only allowed value for non-supporting backends */
 818                 if (flag == 0)
 819                         return count;
 820
 821                 pr_err("DIF protection not supported by backend: %s\n",
 822                        dev->transport->name);
 823                 return -ENOSYS;
 824         }
 825         if (!target_dev_configured(dev)) {
 826                 pr_err("DIF protection requires device to be configured\n");
 827                 return -ENODEV;
 828         }
 829         if (dev->export_count) {
 830                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 831                        " export_count is %d\n", dev, dev->export_count);
 832                 return -EINVAL;
 833         }
 834
 835         da->pi_prot_type = flag;
 836
 837         if (flag && !old_prot) {
 838                 ret = dev->transport->init_prot(dev);
 839                 if (ret) {
 840                         da->pi_prot_type = old_prot;
 841                         da->pi_prot_verify = (bool) da->pi_prot_type;
 842                         return ret;
 843                 }
 844
 845         } else if (!flag && old_prot) {
 846                 dev->transport->free_prot(dev);
 847         }
 848
 849         da->pi_prot_verify = (bool) da->pi_prot_type;
 850         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 851         return count;
 852 }
 853
 854 /* always zero, but attr needs to remain RW to avoid userspace breakage */
 855 static ssize_t pi_prot_format_show(struct config_item *item, char *page)
 856 {
 857         return snprintf(page, PAGE_SIZE, "0\n");
 858 }
 859
 860 static ssize_t pi_prot_format_store(struct config_item *item,
 861                 const char *page, size_t count)
 862 {
 863         struct se_dev_attrib *da = to_attrib(item);
 864         struct se_device *dev = da->da_dev;
 865         bool flag;
 866         int ret;
 867
 868         ret = strtobool(page, &flag);
 869         if (ret < 0)
 870                 return ret;
 871
 872         if (!flag)
 873                 return count;
 874
 875         if (!dev->transport->format_prot) {
 876                 pr_err("DIF protection format not supported by backend %s\n",
 877                        dev->transport->name);
 878                 return -ENOSYS;
 879         }
 880         if (!target_dev_configured(dev)) {
 881                 pr_err("DIF protection format requires device to be configured\n");
 882                 return -ENODEV;
 883         }
 884         if (dev->export_count) {
 885                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 886                        " export_count is %d\n", dev, dev->export_count);
 887                 return -EINVAL;
 888         }
 889
 890         ret = dev->transport->format_prot(dev);
 891         if (ret)
 892                 return ret;
 893
 894         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
 895         return count;
 896 }
 897
 898 static ssize_t pi_prot_verify_store(struct config_item *item,
 899                 const char *page, size_t count)
 900 {
 901         struct se_dev_attrib *da = to_attrib(item);
 902         bool flag;
 903         int ret;
 904
 905         ret = strtobool(page, &flag);
 906         if (ret < 0)
 907                 return ret;
 908
 909         if (!flag) {
 910                 da->pi_prot_verify = flag;
 911                 return count;
 912         }
 913         if (da->hw_pi_prot_type) {
 914                 pr_warn("DIF protection enabled on underlying hardware,"
 915                         " ignoring\n");
 916                 return count;
 917         }
 918         if (!da->pi_prot_type) {
 919                 pr_warn("DIF protection not supported by backend, ignoring\n");
 920                 return count;
 921         }
 922         da->pi_prot_verify = flag;
 923
 924         return count;
 925 }
 926
 927 static ssize_t force_pr_aptpl_store(struct config_item *item,
 928                 const char *page, size_t count)
 929 {
 930         struct se_dev_attrib *da = to_attrib(item);
 931         bool flag;
 932         int ret;
 933
 934         ret = strtobool(page, &flag);
 935         if (ret < 0)
 936                 return ret;
 937         if (da->da_dev->export_count) {
 938                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
 939                        " export_count is %d\n",
 940                        da->da_dev, da->da_dev->export_count);
 941                 return -EINVAL;
 942         }
 943
 944         da->force_pr_aptpl = flag;
 945         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
 946         return count;
 947 }
 948
 949 static ssize_t emulate_rest_reord_store(struct config_item *item,
 950                 const char *page, size_t count)
 951 {
 952         struct se_dev_attrib *da = to_attrib(item);
 953         bool flag;
 954         int ret;
 955
 956         ret = strtobool(page, &flag);
 957         if (ret < 0)
 958                 return ret;
 959
 960         if (flag != 0) {
 961                 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
 962                         " reordering not implemented\n", da->da_dev);
 963                 return -ENOSYS;
 964         }
 965         da->emulate_rest_reord = flag;
 966         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
 967                 da->da_dev, flag);
 968         return count;
 969 }
 970
 971 static ssize_t unmap_zeroes_data_store(struct config_item *item,
 972                 const char *page, size_t count)
 973 {
 974         struct se_dev_attrib *da = to_attrib(item);
 975         struct se_device *dev = da->da_dev;
 976         bool flag;
 977         int ret;
 978
 979         ret = strtobool(page, &flag);
 980         if (ret < 0)
 981                 return ret;
 982
 983         if (da->da_dev->export_count) {
 984                 pr_err("dev[%p]: Unable to change SE Device"
 985                        " unmap_zeroes_data while export_count is %d\n",
 986                        da->da_dev, da->da_dev->export_count);
 987                 return -EINVAL;
 988         }
 989         /*
 990          * We expect this value to be non-zero when generic Block Layer
 991          * Discard supported is detected iblock_configure_device().
 992          */
 993         if (flag && !da->max_unmap_block_desc_count) {
 994                 if (!dev->transport->configure_unmap ||
 995                     !dev->transport->configure_unmap(dev)) {
 996                         pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set because max_unmap_block_desc_count is zero\n",
 997                                da->da_dev);
 998                         return -ENOSYS;
 999                 }
1000         }
1001         da->unmap_zeroes_data = flag;
1002         pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
1003                  da->da_dev, flag);
1004         return count;
1005 }
1006
1007 /*
1008  * Note, this can only be called on unexported SE Device Object.
1009  */
1010 static ssize_t queue_depth_store(struct config_item *item,
1011                 const char *page, size_t count)
1012 {
1013         struct se_dev_attrib *da = to_attrib(item);
1014         struct se_device *dev = da->da_dev;
1015         u32 val;
1016         int ret;
1017
1018         ret = kstrtou32(page, 0, &val);
1019         if (ret < 0)
1020                 return ret;
1021
1022         if (dev->export_count) {
1023                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1024                         " export_count is %d\n",
1025                         dev, dev->export_count);
1026                 return -EINVAL;
1027         }
1028         if (!val) {
1029                 pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1030                 return -EINVAL;
1031         }
1032
1033         if (val > dev->dev_attrib.queue_depth) {
1034                 if (val > dev->dev_attrib.hw_queue_depth) {
1035                         pr_err("dev[%p]: Passed queue_depth:"
1036                                 " %u exceeds TCM/SE_Device MAX"
1037                                 " TCQ: %u\n", dev, val,
1038                                 dev->dev_attrib.hw_queue_depth);
1039                         return -EINVAL;
1040                 }
1041         }
1042         da->queue_depth = dev->queue_depth = val;
1043         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1044         return count;
1045 }
1046
1047 static ssize_t optimal_sectors_store(struct config_item *item,
1048                 const char *page, size_t count)
1049 {
1050         struct se_dev_attrib *da = to_attrib(item);
1051         u32 val;
1052         int ret;
1053
1054         ret = kstrtou32(page, 0, &val);
1055         if (ret < 0)
1056                 return ret;
1057
1058         if (da->da_dev->export_count) {
1059                 pr_err("dev[%p]: Unable to change SE Device"
1060                         " optimal_sectors while export_count is %d\n",
1061                         da->da_dev, da->da_dev->export_count);
1062                 return -EINVAL;
1063         }
1064         if (val > da->hw_max_sectors) {
1065                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1066                         " greater than hw_max_sectors: %u\n",
1067                         da->da_dev, val, da->hw_max_sectors);
1068                 return -EINVAL;
1069         }
1070
1071         da->optimal_sectors = val;
1072         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1073                         da->da_dev, val);
1074         return count;
1075 }
1076
1077 static ssize_t block_size_store(struct config_item *item,
1078                 const char *page, size_t count)
1079 {
1080         struct se_dev_attrib *da = to_attrib(item);
1081         u32 val;
1082         int ret;
1083
1084         ret = kstrtou32(page, 0, &val);
1085         if (ret < 0)
1086                 return ret;
1087
1088         if (da->da_dev->export_count) {
1089                 pr_err("dev[%p]: Unable to change SE Device block_size"
1090                         " while export_count is %d\n",
1091                         da->da_dev, da->da_dev->export_count);
1092                 return -EINVAL;
1093         }
1094
1095         if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1096                 pr_err("dev[%p]: Illegal value for block_device: %u"
1097                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1098                         da->da_dev, val);
1099                 return -EINVAL;
1100         }
1101
1102         da->block_size = val;
1103         if (da->max_bytes_per_io)
1104                 da->hw_max_sectors = da->max_bytes_per_io / val;
1105
1106         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1107                         da->da_dev, val);
1108         return count;
1109 }
1110
1111 static ssize_t alua_support_show(struct config_item *item, char *page)
1112 {
1113         struct se_dev_attrib *da = to_attrib(item);
1114         u8 flags = da->da_dev->transport_flags;
1115
1116         return snprintf(page, PAGE_SIZE, "%d\n",
1117                         flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1118 }
1119
1120 static ssize_t alua_support_store(struct config_item *item,
1121                 const char *page, size_t count)
1122 {
1123         struct se_dev_attrib *da = to_attrib(item);
1124         struct se_device *dev = da->da_dev;
1125         bool flag, oldflag;
1126         int ret;
1127
1128         ret = strtobool(page, &flag);
1129         if (ret < 0)
1130                 return ret;
1131
1132         oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA);
1133         if (flag == oldflag)
1134                 return count;
1135
1136         if (!(dev->transport->transport_flags_changeable &
1137               TRANSPORT_FLAG_PASSTHROUGH_ALUA)) {
1138                 pr_err("dev[%p]: Unable to change SE Device alua_support:"
1139                         " alua_support has fixed value\n", dev);
1140                 return -ENOSYS;
1141         }
1142
1143         if (flag)
1144                 dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1145         else
1146                 dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_ALUA;
1147         return count;
1148 }
1149
1150 static ssize_t pgr_support_show(struct config_item *item, char *page)
1151 {
1152         struct se_dev_attrib *da = to_attrib(item);
1153         u8 flags = da->da_dev->transport_flags;
1154
1155         return snprintf(page, PAGE_SIZE, "%d\n",
1156                         flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1157 }
1158
1159 static ssize_t pgr_support_store(struct config_item *item,
1160                 const char *page, size_t count)
1161 {
1162         struct se_dev_attrib *da = to_attrib(item);
1163         struct se_device *dev = da->da_dev;
1164         bool flag, oldflag;
1165         int ret;
1166
1167         ret = strtobool(page, &flag);
1168         if (ret < 0)
1169                 return ret;
1170
1171         oldflag = !(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR);
1172         if (flag == oldflag)
1173                 return count;
1174
1175         if (!(dev->transport->transport_flags_changeable &
1176               TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
1177                 pr_err("dev[%p]: Unable to change SE Device pgr_support:"
1178                         " pgr_support has fixed value\n", dev);
1179                 return -ENOSYS;
1180         }
1181
1182         if (flag)
1183                 dev->transport_flags &= ~TRANSPORT_FLAG_PASSTHROUGH_PGR;
1184         else
1185                 dev->transport_flags |= TRANSPORT_FLAG_PASSTHROUGH_PGR;
1186         return count;
1187 }
1188
1189 CONFIGFS_ATTR(, emulate_model_alias);
1190 CONFIGFS_ATTR(, emulate_dpo);
1191 CONFIGFS_ATTR(, emulate_fua_write);
1192 CONFIGFS_ATTR(, emulate_fua_read);
1193 CONFIGFS_ATTR(, emulate_write_cache);
1194 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1195 CONFIGFS_ATTR(, emulate_tas);
1196 CONFIGFS_ATTR(, emulate_tpu);
1197 CONFIGFS_ATTR(, emulate_tpws);
1198 CONFIGFS_ATTR(, emulate_caw);
1199 CONFIGFS_ATTR(, emulate_3pc);
1200 CONFIGFS_ATTR(, emulate_pr);
1201 CONFIGFS_ATTR(, pi_prot_type);
1202 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1203 CONFIGFS_ATTR(, pi_prot_format);
1204 CONFIGFS_ATTR(, pi_prot_verify);
1205 CONFIGFS_ATTR(, enforce_pr_isids);
1206 CONFIGFS_ATTR(, is_nonrot);
1207 CONFIGFS_ATTR(, emulate_rest_reord);
1208 CONFIGFS_ATTR(, force_pr_aptpl);
1209 CONFIGFS_ATTR_RO(, hw_block_size);
1210 CONFIGFS_ATTR(, block_size);
1211 CONFIGFS_ATTR_RO(, hw_max_sectors);
1212 CONFIGFS_ATTR(, optimal_sectors);
1213 CONFIGFS_ATTR_RO(, hw_queue_depth);
1214 CONFIGFS_ATTR(, queue_depth);
1215 CONFIGFS_ATTR(, max_unmap_lba_count);
1216 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1217 CONFIGFS_ATTR(, unmap_granularity);
1218 CONFIGFS_ATTR(, unmap_granularity_alignment);
1219 CONFIGFS_ATTR(, unmap_zeroes_data);
1220 CONFIGFS_ATTR(, max_write_same_len);
1221 CONFIGFS_ATTR(, alua_support);
1222 CONFIGFS_ATTR(, pgr_support);
1223
1224 /*
1225  * dev_attrib attributes for devices using the target core SBC/SPC
1226  * interpreter.  Any backend using spc_parse_cdb should be using
1227  * these.
1228  */
1229 struct configfs_attribute *sbc_attrib_attrs[] = {
1230         &attr_emulate_model_alias,
1231         &attr_emulate_dpo,
1232         &attr_emulate_fua_write,
1233         &attr_emulate_fua_read,
1234         &attr_emulate_write_cache,
1235         &attr_emulate_ua_intlck_ctrl,
1236         &attr_emulate_tas,
1237         &attr_emulate_tpu,
1238         &attr_emulate_tpws,
1239         &attr_emulate_caw,
1240         &attr_emulate_3pc,
1241         &attr_emulate_pr,
1242         &attr_pi_prot_type,
1243         &attr_hw_pi_prot_type,
1244         &attr_pi_prot_format,
1245         &attr_pi_prot_verify,
1246         &attr_enforce_pr_isids,
1247         &attr_is_nonrot,
1248         &attr_emulate_rest_reord,
1249         &attr_force_pr_aptpl,
1250         &attr_hw_block_size,
1251         &attr_block_size,
1252         &attr_hw_max_sectors,
1253         &attr_optimal_sectors,
1254         &attr_hw_queue_depth,
1255         &attr_queue_depth,
1256         &attr_max_unmap_lba_count,
1257         &attr_max_unmap_block_desc_count,
1258         &attr_unmap_granularity,
1259         &attr_unmap_granularity_alignment,
1260         &attr_unmap_zeroes_data,
1261         &attr_max_write_same_len,
1262         &attr_alua_support,
1263         &attr_pgr_support,
1264         NULL,
1265 };
1266 EXPORT_SYMBOL(sbc_attrib_attrs);
1267
1268 /*
1269  * Minimal dev_attrib attributes for devices passing through CDBs.
1270  * In this case we only provide a few read-only attributes for
1271  * backwards compatibility.
1272  */
1273 struct configfs_attribute *passthrough_attrib_attrs[] = {
1274         &attr_hw_pi_prot_type,
1275         &attr_hw_block_size,
1276         &attr_hw_max_sectors,
1277         &attr_hw_queue_depth,
1278         &attr_emulate_pr,
1279         &attr_alua_support,
1280         &attr_pgr_support,
1281         NULL,
1282 };
1283 EXPORT_SYMBOL(passthrough_attrib_attrs);
1284
1285 /*
1286  * pr related dev_attrib attributes for devices passing through CDBs,
1287  * but allowing in core pr emulation.
1288  */
1289 struct configfs_attribute *passthrough_pr_attrib_attrs[] = {
1290         &attr_enforce_pr_isids,
1291         &attr_force_pr_aptpl,
1292         NULL,
1293 };
1294 EXPORT_SYMBOL(passthrough_pr_attrib_attrs);
1295
1296 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1297 TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
1298
1299 /* End functions for struct config_item_type tb_dev_attrib_cit */
1300
1301 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1302
1303 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1304 {
1305         return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1306 }
1307
1308 static ssize_t target_check_inquiry_data(char *buf)
1309 {
1310         size_t len;
1311         int i;
1312
1313         len = strlen(buf);
1314
1315         /*
1316          * SPC 4.3.1:
1317          * ASCII data fields shall contain only ASCII printable characters
1318          * (i.e., code values 20h to 7Eh) and may be terminated with one or
1319          * more ASCII null (00h) characters.
1320          */
1321         for (i = 0; i < len; i++) {
1322                 if (buf[i] < 0x20 || buf[i] > 0x7E) {
1323                         pr_err("Emulated T10 Inquiry Data contains non-ASCII-printable characters\n");
1324                         return -EINVAL;
1325                 }
1326         }
1327
1328         return len;
1329 }
1330
1331 /*
1332  * STANDARD and VPD page 0x83 T10 Vendor Identification
1333  */
1334 static ssize_t target_wwn_vendor_id_show(struct config_item *item,
1335                 char *page)
1336 {
1337         return sprintf(page, "%s\n", &to_t10_wwn(item)->vendor[0]);
1338 }
1339
1340 static ssize_t target_wwn_vendor_id_store(struct config_item *item,
1341                 const char *page, size_t count)
1342 {
1343         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1344         struct se_device *dev = t10_wwn->t10_dev;
1345         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1346         unsigned char buf[INQUIRY_VENDOR_LEN + 2];
1347         char *stripped = NULL;
1348         size_t len;
1349         ssize_t ret;
1350
1351         len = strlcpy(buf, page, sizeof(buf));
1352         if (len < sizeof(buf)) {
1353                 /* Strip any newline added from userspace. */
1354                 stripped = strstrip(buf);
1355                 len = strlen(stripped);
1356         }
1357         if (len > INQUIRY_VENDOR_LEN) {
1358                 pr_err("Emulated T10 Vendor Identification exceeds"
1359                         " INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
1360                         "\n");
1361                 return -EOVERFLOW;
1362         }
1363
1364         ret = target_check_inquiry_data(stripped);
1365
1366         if (ret < 0)
1367                 return ret;
1368
1369         /*
1370          * Check to see if any active exports exist.  If they do exist, fail
1371          * here as changing this information on the fly (underneath the
1372          * initiator side OS dependent multipath code) could cause negative
1373          * effects.
1374          */
1375         if (dev->export_count) {
1376                 pr_err("Unable to set T10 Vendor Identification while"
1377                         " active %d exports exist\n", dev->export_count);
1378                 return -EINVAL;
1379         }
1380
1381         BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
1382         strlcpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));
1383
1384         pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"
1385                  " %s\n", dev->t10_wwn.vendor);
1386
1387         return count;
1388 }
1389
1390 static ssize_t target_wwn_product_id_show(struct config_item *item,
1391                 char *page)
1392 {
1393         return sprintf(page, "%s\n", &to_t10_wwn(item)->model[0]);
1394 }
1395
1396 static ssize_t target_wwn_product_id_store(struct config_item *item,
1397                 const char *page, size_t count)
1398 {
1399         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1400         struct se_device *dev = t10_wwn->t10_dev;
1401         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1402         unsigned char buf[INQUIRY_MODEL_LEN + 2];
1403         char *stripped = NULL;
1404         size_t len;
1405         ssize_t ret;
1406
1407         len = strlcpy(buf, page, sizeof(buf));
1408         if (len < sizeof(buf)) {
1409                 /* Strip any newline added from userspace. */
1410                 stripped = strstrip(buf);
1411                 len = strlen(stripped);
1412         }
1413         if (len > INQUIRY_MODEL_LEN) {
1414                 pr_err("Emulated T10 Vendor exceeds INQUIRY_MODEL_LEN: "
1415                          __stringify(INQUIRY_MODEL_LEN)
1416                         "\n");
1417                 return -EOVERFLOW;
1418         }
1419
1420         ret = target_check_inquiry_data(stripped);
1421
1422         if (ret < 0)
1423                 return ret;
1424
1425         /*
1426          * Check to see if any active exports exist.  If they do exist, fail
1427          * here as changing this information on the fly (underneath the
1428          * initiator side OS dependent multipath code) could cause negative
1429          * effects.
1430          */
1431         if (dev->export_count) {
1432                 pr_err("Unable to set T10 Model while active %d exports exist\n",
1433                         dev->export_count);
1434                 return -EINVAL;
1435         }
1436
1437         BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
1438         strlcpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));
1439
1440         pr_debug("Target_Core_ConfigFS: Set emulated T10 Model Identification: %s\n",
1441                  dev->t10_wwn.model);
1442
1443         return count;
1444 }
1445
1446 static ssize_t target_wwn_revision_show(struct config_item *item,
1447                 char *page)
1448 {
1449         return sprintf(page, "%s\n", &to_t10_wwn(item)->revision[0]);
1450 }
1451
1452 static ssize_t target_wwn_revision_store(struct config_item *item,
1453                 const char *page, size_t count)
1454 {
1455         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1456         struct se_device *dev = t10_wwn->t10_dev;
1457         /* +2 to allow for a trailing (stripped) '\n' and null-terminator */
1458         unsigned char buf[INQUIRY_REVISION_LEN + 2];
1459         char *stripped = NULL;
1460         size_t len;
1461         ssize_t ret;
1462
1463         len = strlcpy(buf, page, sizeof(buf));
1464         if (len < sizeof(buf)) {
1465                 /* Strip any newline added from userspace. */
1466                 stripped = strstrip(buf);
1467                 len = strlen(stripped);
1468         }
1469         if (len > INQUIRY_REVISION_LEN) {
1470                 pr_err("Emulated T10 Revision exceeds INQUIRY_REVISION_LEN: "
1471                          __stringify(INQUIRY_REVISION_LEN)
1472                         "\n");
1473                 return -EOVERFLOW;
1474         }
1475
1476         ret = target_check_inquiry_data(stripped);
1477
1478         if (ret < 0)
1479                 return ret;
1480
1481         /*
1482          * Check to see if any active exports exist.  If they do exist, fail
1483          * here as changing this information on the fly (underneath the
1484          * initiator side OS dependent multipath code) could cause negative
1485          * effects.
1486          */
1487         if (dev->export_count) {
1488                 pr_err("Unable to set T10 Revision while active %d exports exist\n",
1489                         dev->export_count);
1490                 return -EINVAL;
1491         }
1492
1493         BUILD_BUG_ON(sizeof(dev->t10_wwn.revision) != INQUIRY_REVISION_LEN + 1);
1494         strlcpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));
1495
1496         pr_debug("Target_Core_ConfigFS: Set emulated T10 Revision: %s\n",
1497                  dev->t10_wwn.revision);
1498
1499         return count;
1500 }
1501
1502 static ssize_t
1503 target_wwn_company_id_show(struct config_item *item,
1504                                 char *page)
1505 {
1506         return snprintf(page, PAGE_SIZE, "%#08x\n",
1507                         to_t10_wwn(item)->company_id);
1508 }
1509
1510 static ssize_t
1511 target_wwn_company_id_store(struct config_item *item,
1512                                  const char *page, size_t count)
1513 {
1514         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1515         struct se_device *dev = t10_wwn->t10_dev;
1516         u32 val;
1517         int ret;
1518
1519         /*
1520          * The IEEE COMPANY_ID field should contain a 24-bit canonical
1521          * form OUI assigned by the IEEE.
1522          */
1523         ret = kstrtou32(page, 0, &val);
1524         if (ret < 0)
1525                 return ret;
1526
1527         if (val >= 0x1000000)
1528                 return -EOVERFLOW;
1529
1530         /*
1531          * Check to see if any active exports exist. If they do exist, fail
1532          * here as changing this information on the fly (underneath the
1533          * initiator side OS dependent multipath code) could cause negative
1534          * effects.
1535          */
1536         if (dev->export_count) {
1537                 pr_err("Unable to set Company ID while %u exports exist\n",
1538                        dev->export_count);
1539                 return -EINVAL;
1540         }
1541
1542         t10_wwn->company_id = val;
1543
1544         pr_debug("Target_Core_ConfigFS: Set IEEE Company ID: %#08x\n",
1545                  t10_wwn->company_id);
1546
1547         return count;
1548 }
1549
1550 /*
1551  * VPD page 0x80 Unit serial
1552  */
1553 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1554                 char *page)
1555 {
1556         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1557                 &to_t10_wwn(item)->unit_serial[0]);
1558 }
1559
1560 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1561                 const char *page, size_t count)
1562 {
1563         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1564         struct se_device *dev = t10_wwn->t10_dev;
1565         unsigned char buf[INQUIRY_VPD_SERIAL_LEN] = { };
1566
1567         /*
1568          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1569          * from the struct scsi_device level firmware, do not allow
1570          * VPD Unit Serial to be emulated.
1571          *
1572          * Note this struct scsi_device could also be emulating VPD
1573          * information from its drivers/scsi LLD.  But for now we assume
1574          * it is doing 'the right thing' wrt a world wide unique
1575          * VPD Unit Serial Number that OS dependent multipath can depend on.
1576          */
1577         if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1578                 pr_err("Underlying SCSI device firmware provided VPD"
1579                         " Unit Serial, ignoring request\n");
1580                 return -EOPNOTSUPP;
1581         }
1582
1583         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1584                 pr_err("Emulated VPD Unit Serial exceeds"
1585                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1586                 return -EOVERFLOW;
1587         }
1588         /*
1589          * Check to see if any active $FABRIC_MOD exports exist.  If they
1590          * do exist, fail here as changing this information on the fly
1591          * (underneath the initiator side OS dependent multipath code)
1592          * could cause negative effects.
1593          */
1594         if (dev->export_count) {
1595                 pr_err("Unable to set VPD Unit Serial while"
1596                         " active %d $FABRIC_MOD exports exist\n",
1597                         dev->export_count);
1598                 return -EINVAL;
1599         }
1600
1601         /*
1602          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1603          *
1604          * Also, strip any newline added from the userspace
1605          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1606          */
1607         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1608         snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1609                         "%s", strstrip(buf));
1610         dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1611
1612         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1613                         " %s\n", dev->t10_wwn.unit_serial);
1614
1615         return count;
1616 }
1617
1618 /*
1619  * VPD page 0x83 Protocol Identifier
1620  */
1621 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1622                 char *page)
1623 {
1624         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1625         struct t10_vpd *vpd;
1626         unsigned char buf[VPD_TMP_BUF_SIZE] = { };
1627         ssize_t len = 0;
1628
1629         spin_lock(&t10_wwn->t10_vpd_lock);
1630         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1631                 if (!vpd->protocol_identifier_set)
1632                         continue;
1633
1634                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1635
1636                 if (len + strlen(buf) >= PAGE_SIZE)
1637                         break;
1638
1639                 len += sprintf(page+len, "%s", buf);
1640         }
1641         spin_unlock(&t10_wwn->t10_vpd_lock);
1642
1643         return len;
1644 }
1645
1646 /*
1647  * Generic wrapper for dumping VPD identifiers by association.
1648  */
1649 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
1650 static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
1651                 char *page)                                             \
1652 {                                                                       \
1653         struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
1654         struct t10_vpd *vpd;                                            \
1655         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
1656         ssize_t len = 0;                                                \
1657                                                                         \
1658         spin_lock(&t10_wwn->t10_vpd_lock);                              \
1659         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
1660                 if (vpd->association != _assoc)                         \
1661                         continue;                                       \
1662                                                                         \
1663                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1664                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
1665                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1666                         break;                                          \
1667                 len += sprintf(page+len, "%s", buf);                    \
1668                                                                         \
1669                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1670                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1671                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1672                         break;                                          \
1673                 len += sprintf(page+len, "%s", buf);                    \
1674                                                                         \
1675                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1676                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1677                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1678                         break;                                          \
1679                 len += sprintf(page+len, "%s", buf);                    \
1680         }                                                               \
1681         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
1682                                                                         \
1683         return len;                                                     \
1684 }
1685
1686 /* VPD page 0x83 Association: Logical Unit */
1687 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1688 /* VPD page 0x83 Association: Target Port */
1689 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1690 /* VPD page 0x83 Association: SCSI Target Device */
1691 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1692
1693 CONFIGFS_ATTR(target_wwn_, vendor_id);
1694 CONFIGFS_ATTR(target_wwn_, product_id);
1695 CONFIGFS_ATTR(target_wwn_, revision);
1696 CONFIGFS_ATTR(target_wwn_, company_id);
1697 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1698 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1699 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1700 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1701 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1702
1703 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1704         &target_wwn_attr_vendor_id,
1705         &target_wwn_attr_product_id,
1706         &target_wwn_attr_revision,
1707         &target_wwn_attr_company_id,
1708         &target_wwn_attr_vpd_unit_serial,
1709         &target_wwn_attr_vpd_protocol_identifier,
1710         &target_wwn_attr_vpd_assoc_logical_unit,
1711         &target_wwn_attr_vpd_assoc_target_port,
1712         &target_wwn_attr_vpd_assoc_scsi_target_device,
1713         NULL,
1714 };
1715
1716 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1717
1718 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1719
1720 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1721
1722 static struct se_device *pr_to_dev(struct config_item *item)
1723 {
1724         return container_of(to_config_group(item), struct se_device,
1725                         dev_pr_group);
1726 }
1727
1728 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1729                 char *page)
1730 {
1731         struct se_node_acl *se_nacl;
1732         struct t10_pr_registration *pr_reg;
1733         char i_buf[PR_REG_ISID_ID_LEN] = { };
1734
1735         pr_reg = dev->dev_pr_res_holder;
1736         if (!pr_reg)
1737                 return sprintf(page, "No SPC-3 Reservation holder\n");
1738
1739         se_nacl = pr_reg->pr_reg_nacl;
1740         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1741
1742         return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1743                 se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1744                 se_nacl->initiatorname, i_buf);
1745 }
1746
1747 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1748                 char *page)
1749 {
1750         struct se_session *sess = dev->reservation_holder;
1751         struct se_node_acl *se_nacl;
1752         ssize_t len;
1753
1754         if (sess) {
1755                 se_nacl = sess->se_node_acl;
1756                 len = sprintf(page,
1757                               "SPC-2 Reservation: %s Initiator: %s\n",
1758                               se_nacl->se_tpg->se_tpg_tfo->fabric_name,
1759                               se_nacl->initiatorname);
1760         } else {
1761                 len = sprintf(page, "No SPC-2 Reservation holder\n");
1762         }
1763         return len;
1764 }
1765
1766 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1767 {
1768         struct se_device *dev = pr_to_dev(item);
1769         int ret;
1770
1771         if (!dev->dev_attrib.emulate_pr)
1772                 return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1773
1774         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1775                 return sprintf(page, "Passthrough\n");
1776
1777         spin_lock(&dev->dev_reservation_lock);
1778         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1779                 ret = target_core_dev_pr_show_spc2_res(dev, page);
1780         else
1781                 ret = target_core_dev_pr_show_spc3_res(dev, page);
1782         spin_unlock(&dev->dev_reservation_lock);
1783         return ret;
1784 }
1785
1786 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1787                 char *page)
1788 {
1789         struct se_device *dev = pr_to_dev(item);
1790         ssize_t len = 0;
1791
1792         spin_lock(&dev->dev_reservation_lock);
1793         if (!dev->dev_pr_res_holder) {
1794                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1795         } else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1796                 len = sprintf(page, "SPC-3 Reservation: All Target"
1797                         " Ports registration\n");
1798         } else {
1799                 len = sprintf(page, "SPC-3 Reservation: Single"
1800                         " Target Port registration\n");
1801         }
1802
1803         spin_unlock(&dev->dev_reservation_lock);
1804         return len;
1805 }
1806
1807 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1808                 char *page)
1809 {
1810         return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1811 }
1812
1813
1814 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1815                 char *page)
1816 {
1817         struct se_device *dev = pr_to_dev(item);
1818         struct se_node_acl *se_nacl;
1819         struct se_portal_group *se_tpg;
1820         struct t10_pr_registration *pr_reg;
1821         const struct target_core_fabric_ops *tfo;
1822         ssize_t len = 0;
1823
1824         spin_lock(&dev->dev_reservation_lock);
1825         pr_reg = dev->dev_pr_res_holder;
1826         if (!pr_reg) {
1827                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1828                 goto out_unlock;
1829         }
1830
1831         se_nacl = pr_reg->pr_reg_nacl;
1832         se_tpg = se_nacl->se_tpg;
1833         tfo = se_tpg->se_tpg_tfo;
1834
1835         len += sprintf(page+len, "SPC-3 Reservation: %s"
1836                 " Target Node Endpoint: %s\n", tfo->fabric_name,
1837                 tfo->tpg_get_wwn(se_tpg));
1838         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1839                 " Identifier Tag: %hu %s Portal Group Tag: %hu"
1840                 " %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1841                 tfo->fabric_name, tfo->tpg_get_tag(se_tpg),
1842                 tfo->fabric_name, pr_reg->pr_aptpl_target_lun);
1843
1844 out_unlock:
1845         spin_unlock(&dev->dev_reservation_lock);
1846         return len;
1847 }
1848
1849
1850 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1851                 char *page)
1852 {
1853         struct se_device *dev = pr_to_dev(item);
1854         const struct target_core_fabric_ops *tfo;
1855         struct t10_pr_registration *pr_reg;
1856         unsigned char buf[384];
1857         char i_buf[PR_REG_ISID_ID_LEN];
1858         ssize_t len = 0;
1859         int reg_count = 0;
1860
1861         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1862
1863         spin_lock(&dev->t10_pr.registration_lock);
1864         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1865                         pr_reg_list) {
1866
1867                 memset(buf, 0, 384);
1868                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1869                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1870                 core_pr_dump_initiator_port(pr_reg, i_buf,
1871                                         PR_REG_ISID_ID_LEN);
1872                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1873                         tfo->fabric_name,
1874                         pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1875                         pr_reg->pr_res_generation);
1876
1877                 if (len + strlen(buf) >= PAGE_SIZE)
1878                         break;
1879
1880                 len += sprintf(page+len, "%s", buf);
1881                 reg_count++;
1882         }
1883         spin_unlock(&dev->t10_pr.registration_lock);
1884
1885         if (!reg_count)
1886                 len += sprintf(page+len, "None\n");
1887
1888         return len;
1889 }
1890
1891 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1892 {
1893         struct se_device *dev = pr_to_dev(item);
1894         struct t10_pr_registration *pr_reg;
1895         ssize_t len = 0;
1896
1897         spin_lock(&dev->dev_reservation_lock);
1898         pr_reg = dev->dev_pr_res_holder;
1899         if (pr_reg) {
1900                 len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1901                         core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1902         } else {
1903                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1904         }
1905
1906         spin_unlock(&dev->dev_reservation_lock);
1907         return len;
1908 }
1909
1910 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1911 {
1912         struct se_device *dev = pr_to_dev(item);
1913
1914         if (!dev->dev_attrib.emulate_pr)
1915                 return sprintf(page, "SPC_RESERVATIONS_DISABLED\n");
1916         if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1917                 return sprintf(page, "SPC_PASSTHROUGH\n");
1918         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1919                 return sprintf(page, "SPC2_RESERVATIONS\n");
1920
1921         return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1922 }
1923
1924 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1925                 char *page)
1926 {
1927         struct se_device *dev = pr_to_dev(item);
1928
1929         if (!dev->dev_attrib.emulate_pr ||
1930             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1931                 return 0;
1932
1933         return sprintf(page, "APTPL Bit Status: %s\n",
1934                 (dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1935 }
1936
1937 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1938                 char *page)
1939 {
1940         struct se_device *dev = pr_to_dev(item);
1941
1942         if (!dev->dev_attrib.emulate_pr ||
1943             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1944                 return 0;
1945
1946         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1947 }
1948
1949 enum {
1950         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1951         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1952         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1953         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1954 };
1955
1956 static match_table_t tokens = {
1957         {Opt_initiator_fabric, "initiator_fabric=%s"},
1958         {Opt_initiator_node, "initiator_node=%s"},
1959         {Opt_initiator_sid, "initiator_sid=%s"},
1960         {Opt_sa_res_key, "sa_res_key=%s"},
1961         {Opt_res_holder, "res_holder=%d"},
1962         {Opt_res_type, "res_type=%d"},
1963         {Opt_res_scope, "res_scope=%d"},
1964         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1965         {Opt_mapped_lun, "mapped_lun=%u"},
1966         {Opt_target_fabric, "target_fabric=%s"},
1967         {Opt_target_node, "target_node=%s"},
1968         {Opt_tpgt, "tpgt=%d"},
1969         {Opt_port_rtpi, "port_rtpi=%d"},
1970         {Opt_target_lun, "target_lun=%u"},
1971         {Opt_err, NULL}
1972 };
1973
1974 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1975                 const char *page, size_t count)
1976 {
1977         struct se_device *dev = pr_to_dev(item);
1978         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1979         unsigned char *t_fabric = NULL, *t_port = NULL;
1980         char *orig, *ptr, *opts;
1981         substring_t args[MAX_OPT_ARGS];
1982         unsigned long long tmp_ll;
1983         u64 sa_res_key = 0;
1984         u64 mapped_lun = 0, target_lun = 0;
1985         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1986         u16 tpgt = 0;
1987         u8 type = 0;
1988
1989         if (!dev->dev_attrib.emulate_pr ||
1990             (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1991                 return count;
1992         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1993                 return count;
1994
1995         if (dev->export_count) {
1996                 pr_debug("Unable to process APTPL metadata while"
1997                         " active fabric exports exist\n");
1998                 return -EINVAL;
1999         }
2000
2001         opts = kstrdup(page, GFP_KERNEL);
2002         if (!opts)
2003                 return -ENOMEM;
2004
2005         orig = opts;
2006         while ((ptr = strsep(&opts, ",\n")) != NULL) {
2007                 if (!*ptr)
2008                         continue;
2009
2010                 token = match_token(ptr, tokens, args);
2011                 switch (token) {
2012                 case Opt_initiator_fabric:
2013                         i_fabric = match_strdup(args);
2014                         if (!i_fabric) {
2015                                 ret = -ENOMEM;
2016                                 goto out;
2017                         }
2018                         break;
2019                 case Opt_initiator_node:
2020                         i_port = match_strdup(args);
2021                         if (!i_port) {
2022                                 ret = -ENOMEM;
2023                                 goto out;
2024                         }
2025                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
2026                                 pr_err("APTPL metadata initiator_node="
2027                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
2028                                         PR_APTPL_MAX_IPORT_LEN);
2029                                 ret = -EINVAL;
2030                                 break;
2031                         }
2032                         break;
2033                 case Opt_initiator_sid:
2034                         isid = match_strdup(args);
2035                         if (!isid) {
2036                                 ret = -ENOMEM;
2037                                 goto out;
2038                         }
2039                         if (strlen(isid) >= PR_REG_ISID_LEN) {
2040                                 pr_err("APTPL metadata initiator_isid"
2041                                         "= exceeds PR_REG_ISID_LEN: %d\n",
2042                                         PR_REG_ISID_LEN);
2043                                 ret = -EINVAL;
2044                                 break;
2045                         }
2046                         break;
2047                 case Opt_sa_res_key:
2048                         ret = match_u64(args,  &tmp_ll);
2049                         if (ret < 0) {
2050                                 pr_err("kstrtoull() failed for sa_res_key=\n");
2051                                 goto out;
2052                         }
2053                         sa_res_key = (u64)tmp_ll;
2054                         break;
2055                 /*
2056                  * PR APTPL Metadata for Reservation
2057                  */
2058                 case Opt_res_holder:
2059                         ret = match_int(args, &arg);
2060                         if (ret)
2061                                 goto out;
2062                         res_holder = arg;
2063                         break;
2064                 case Opt_res_type:
2065                         ret = match_int(args, &arg);
2066                         if (ret)
2067                                 goto out;
2068                         type = (u8)arg;
2069                         break;
2070                 case Opt_res_scope:
2071                         ret = match_int(args, &arg);
2072                         if (ret)
2073                                 goto out;
2074                         break;
2075                 case Opt_res_all_tg_pt:
2076                         ret = match_int(args, &arg);
2077                         if (ret)
2078                                 goto out;
2079                         all_tg_pt = (int)arg;
2080                         break;
2081                 case Opt_mapped_lun:
2082                         ret = match_u64(args, &tmp_ll);
2083                         if (ret)
2084                                 goto out;
2085                         mapped_lun = (u64)tmp_ll;
2086                         break;
2087                 /*
2088                  * PR APTPL Metadata for Target Port
2089                  */
2090                 case Opt_target_fabric:
2091                         t_fabric = match_strdup(args);
2092                         if (!t_fabric) {
2093                                 ret = -ENOMEM;
2094                                 goto out;
2095                         }
2096                         break;
2097                 case Opt_target_node:
2098                         t_port = match_strdup(args);
2099                         if (!t_port) {
2100                                 ret = -ENOMEM;
2101                                 goto out;
2102                         }
2103                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
2104                                 pr_err("APTPL metadata target_node="
2105                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
2106                                         PR_APTPL_MAX_TPORT_LEN);
2107                                 ret = -EINVAL;
2108                                 break;
2109                         }
2110                         break;
2111                 case Opt_tpgt:
2112                         ret = match_int(args, &arg);
2113                         if (ret)
2114                                 goto out;
2115                         tpgt = (u16)arg;
2116                         break;
2117                 case Opt_port_rtpi:
2118                         ret = match_int(args, &arg);
2119                         if (ret)
2120                                 goto out;
2121                         break;
2122                 case Opt_target_lun:
2123                         ret = match_u64(args, &tmp_ll);
2124                         if (ret)
2125                                 goto out;
2126                         target_lun = (u64)tmp_ll;
2127                         break;
2128                 default:
2129                         break;
2130                 }
2131         }
2132
2133         if (!i_port || !t_port || !sa_res_key) {
2134                 pr_err("Illegal parameters for APTPL registration\n");
2135                 ret = -EINVAL;
2136                 goto out;
2137         }
2138
2139         if (res_holder && !(type)) {
2140                 pr_err("Illegal PR type: 0x%02x for reservation"
2141                                 " holder\n", type);
2142                 ret = -EINVAL;
2143                 goto out;
2144         }
2145
2146         ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
2147                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
2148                         res_holder, all_tg_pt, type);
2149 out:
2150         kfree(i_fabric);
2151         kfree(i_port);
2152         kfree(isid);
2153         kfree(t_fabric);
2154         kfree(t_port);
2155         kfree(orig);
2156         return (ret == 0) ? count : ret;
2157 }
2158
2159
2160 CONFIGFS_ATTR_RO(target_pr_, res_holder);
2161 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
2162 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
2163 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
2164 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
2165 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
2166 CONFIGFS_ATTR_RO(target_pr_, res_type);
2167 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
2168 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
2169
2170 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
2171         &target_pr_attr_res_holder,
2172         &target_pr_attr_res_pr_all_tgt_pts,
2173         &target_pr_attr_res_pr_generation,
2174         &target_pr_attr_res_pr_holder_tg_port,
2175         &target_pr_attr_res_pr_registered_i_pts,
2176         &target_pr_attr_res_pr_type,
2177         &target_pr_attr_res_type,
2178         &target_pr_attr_res_aptpl_active,
2179         &target_pr_attr_res_aptpl_metadata,
2180         NULL,
2181 };
2182
2183 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
2184
2185 /*  End functions for struct config_item_type tb_dev_pr_cit */
2186
2187 /*  Start functions for struct config_item_type tb_dev_cit */
2188
2189 static inline struct se_device *to_device(struct config_item *item)
2190 {
2191         return container_of(to_config_group(item), struct se_device, dev_group);
2192 }
2193
2194 static ssize_t target_dev_info_show(struct config_item *item, char *page)
2195 {
2196         struct se_device *dev = to_device(item);
2197         int bl = 0;
2198         ssize_t read_bytes = 0;
2199
2200         transport_dump_dev_state(dev, page, &bl);
2201         read_bytes += bl;
2202         read_bytes += dev->transport->show_configfs_dev_params(dev,
2203                         page+read_bytes);
2204         return read_bytes;
2205 }
2206
2207 static ssize_t target_dev_control_store(struct config_item *item,
2208                 const char *page, size_t count)
2209 {
2210         struct se_device *dev = to_device(item);
2211
2212         return dev->transport->set_configfs_dev_params(dev, page, count);
2213 }
2214
2215 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
2216 {
2217         struct se_device *dev = to_device(item);
2218
2219         if (!(dev->dev_flags & DF_USING_ALIAS))
2220                 return 0;
2221
2222         return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
2223 }
2224
2225 static ssize_t target_dev_alias_store(struct config_item *item,
2226                 const char *page, size_t count)
2227 {
2228         struct se_device *dev = to_device(item);
2229         struct se_hba *hba = dev->se_hba;
2230         ssize_t read_bytes;
2231
2232         if (count > (SE_DEV_ALIAS_LEN-1)) {
2233                 pr_err("alias count: %d exceeds"
2234                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
2235                         SE_DEV_ALIAS_LEN-1);
2236                 return -EINVAL;
2237         }
2238
2239         read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
2240         if (!read_bytes)
2241                 return -EINVAL;
2242         if (dev->dev_alias[read_bytes - 1] == '\n')
2243                 dev->dev_alias[read_bytes - 1] = '\0';
2244
2245         dev->dev_flags |= DF_USING_ALIAS;
2246
2247         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
2248                 config_item_name(&hba->hba_group.cg_item),
2249                 config_item_name(&dev->dev_group.cg_item),
2250                 dev->dev_alias);
2251
2252         return read_bytes;
2253 }
2254
2255 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
2256 {
2257         struct se_device *dev = to_device(item);
2258
2259         if (!(dev->dev_flags & DF_USING_UDEV_PATH))
2260                 return 0;
2261
2262         return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
2263 }
2264
2265 static ssize_t target_dev_udev_path_store(struct config_item *item,
2266                 const char *page, size_t count)
2267 {
2268         struct se_device *dev = to_device(item);
2269         struct se_hba *hba = dev->se_hba;
2270         ssize_t read_bytes;
2271
2272         if (count > (SE_UDEV_PATH_LEN-1)) {
2273                 pr_err("udev_path count: %d exceeds"
2274                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
2275                         SE_UDEV_PATH_LEN-1);
2276                 return -EINVAL;
2277         }
2278
2279         read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
2280                         "%s", page);
2281         if (!read_bytes)
2282                 return -EINVAL;
2283         if (dev->udev_path[read_bytes - 1] == '\n')
2284                 dev->udev_path[read_bytes - 1] = '\0';
2285
2286         dev->dev_flags |= DF_USING_UDEV_PATH;
2287
2288         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
2289                 config_item_name(&hba->hba_group.cg_item),
2290                 config_item_name(&dev->dev_group.cg_item),
2291                 dev->udev_path);
2292
2293         return read_bytes;
2294 }
2295
2296 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
2297 {
2298         struct se_device *dev = to_device(item);
2299
2300         return snprintf(page, PAGE_SIZE, "%d\n", target_dev_configured(dev));
2301 }
2302
2303 static ssize_t target_dev_enable_store(struct config_item *item,
2304                 const char *page, size_t count)
2305 {
2306         struct se_device *dev = to_device(item);
2307         char *ptr;
2308         int ret;
2309
2310         ptr = strstr(page, "1");
2311         if (!ptr) {
2312                 pr_err("For dev_enable ops, only valid value"
2313                                 " is \"1\"\n");
2314                 return -EINVAL;
2315         }
2316
2317         ret = target_configure_device(dev);
2318         if (ret)
2319                 return ret;
2320         return count;
2321 }
2322
2323 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
2324 {
2325         struct se_device *dev = to_device(item);
2326         struct config_item *lu_ci;
2327         struct t10_alua_lu_gp *lu_gp;
2328         struct t10_alua_lu_gp_member *lu_gp_mem;
2329         ssize_t len = 0;
2330
2331         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2332         if (!lu_gp_mem)
2333                 return 0;
2334
2335         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2336         lu_gp = lu_gp_mem->lu_gp;
2337         if (lu_gp) {
2338                 lu_ci = &lu_gp->lu_gp_group.cg_item;
2339                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
2340                         config_item_name(lu_ci), lu_gp->lu_gp_id);
2341         }
2342         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2343
2344         return len;
2345 }
2346
2347 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
2348                 const char *page, size_t count)
2349 {
2350         struct se_device *dev = to_device(item);
2351         struct se_hba *hba = dev->se_hba;
2352         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2353         struct t10_alua_lu_gp_member *lu_gp_mem;
2354         unsigned char buf[LU_GROUP_NAME_BUF] = { };
2355         int move = 0;
2356
2357         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2358         if (!lu_gp_mem)
2359                 return count;
2360
2361         if (count > LU_GROUP_NAME_BUF) {
2362                 pr_err("ALUA LU Group Alias too large!\n");
2363                 return -EINVAL;
2364         }
2365         memcpy(buf, page, count);
2366         /*
2367          * Any ALUA logical unit alias besides "NULL" means we will be
2368          * making a new group association.
2369          */
2370         if (strcmp(strstrip(buf), "NULL")) {
2371                 /*
2372                  * core_alua_get_lu_gp_by_name() will increment reference to
2373                  * struct t10_alua_lu_gp.  This reference is released with
2374                  * core_alua_get_lu_gp_by_name below().
2375                  */
2376                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2377                 if (!lu_gp_new)
2378                         return -ENODEV;
2379         }
2380
2381         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2382         lu_gp = lu_gp_mem->lu_gp;
2383         if (lu_gp) {
2384                 /*
2385                  * Clearing an existing lu_gp association, and replacing
2386                  * with NULL
2387                  */
2388                 if (!lu_gp_new) {
2389                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2390                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2391                                 " %hu\n",
2392                                 config_item_name(&hba->hba_group.cg_item),
2393                                 config_item_name(&dev->dev_group.cg_item),
2394                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
2395                                 lu_gp->lu_gp_id);
2396
2397                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2398                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2399
2400                         return count;
2401                 }
2402                 /*
2403                  * Removing existing association of lu_gp_mem with lu_gp
2404                  */
2405                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2406                 move = 1;
2407         }
2408         /*
2409          * Associate lu_gp_mem with lu_gp_new.
2410          */
2411         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2412         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2413
2414         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2415                 " core/alua/lu_gps/%s, ID: %hu\n",
2416                 (move) ? "Moving" : "Adding",
2417                 config_item_name(&hba->hba_group.cg_item),
2418                 config_item_name(&dev->dev_group.cg_item),
2419                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2420                 lu_gp_new->lu_gp_id);
2421
2422         core_alua_put_lu_gp_from_name(lu_gp_new);
2423         return count;
2424 }
2425
2426 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2427 {
2428         struct se_device *dev = to_device(item);
2429         struct t10_alua_lba_map *map;
2430         struct t10_alua_lba_map_member *mem;
2431         char *b = page;
2432         int bl = 0;
2433         char state;
2434
2435         spin_lock(&dev->t10_alua.lba_map_lock);
2436         if (!list_empty(&dev->t10_alua.lba_map_list))
2437             bl += sprintf(b + bl, "%u %u\n",
2438                           dev->t10_alua.lba_map_segment_size,
2439                           dev->t10_alua.lba_map_segment_multiplier);
2440         list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2441                 bl += sprintf(b + bl, "%llu %llu",
2442                               map->lba_map_first_lba, map->lba_map_last_lba);
2443                 list_for_each_entry(mem, &map->lba_map_mem_list,
2444                                     lba_map_mem_list) {
2445                         switch (mem->lba_map_mem_alua_state) {
2446                         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2447                                 state = 'O';
2448                                 break;
2449                         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2450                                 state = 'A';
2451                                 break;
2452                         case ALUA_ACCESS_STATE_STANDBY:
2453                                 state = 'S';
2454                                 break;
2455                         case ALUA_ACCESS_STATE_UNAVAILABLE:
2456                                 state = 'U';
2457                                 break;
2458                         default:
2459                                 state = '.';
2460                                 break;
2461                         }
2462                         bl += sprintf(b + bl, " %d:%c",
2463                                       mem->lba_map_mem_alua_pg_id, state);
2464                 }
2465                 bl += sprintf(b + bl, "\n");
2466         }
2467         spin_unlock(&dev->t10_alua.lba_map_lock);
2468         return bl;
2469 }
2470
2471 static ssize_t target_dev_lba_map_store(struct config_item *item,
2472                 const char *page, size_t count)
2473 {
2474         struct se_device *dev = to_device(item);
2475         struct t10_alua_lba_map *lba_map = NULL;
2476         struct list_head lba_list;
2477         char *map_entries, *orig, *ptr;
2478         char state;
2479         int pg_num = -1, pg;
2480         int ret = 0, num = 0, pg_id, alua_state;
2481         unsigned long start_lba = -1, end_lba = -1;
2482         unsigned long segment_size = -1, segment_mult = -1;
2483
2484         orig = map_entries = kstrdup(page, GFP_KERNEL);
2485         if (!map_entries)
2486                 return -ENOMEM;
2487
2488         INIT_LIST_HEAD(&lba_list);
2489         while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2490                 if (!*ptr)
2491                         continue;
2492
2493                 if (num == 0) {
2494                         if (sscanf(ptr, "%lu %lu\n",
2495                                    &segment_size, &segment_mult) != 2) {
2496                                 pr_err("Invalid line %d\n", num);
2497                                 ret = -EINVAL;
2498                                 break;
2499                         }
2500                         num++;
2501                         continue;
2502                 }
2503                 if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2504                         pr_err("Invalid line %d\n", num);
2505                         ret = -EINVAL;
2506                         break;
2507                 }
2508                 ptr = strchr(ptr, ' ');
2509                 if (!ptr) {
2510                         pr_err("Invalid line %d, missing end lba\n", num);
2511                         ret = -EINVAL;
2512                         break;
2513                 }
2514                 ptr++;
2515                 ptr = strchr(ptr, ' ');
2516                 if (!ptr) {
2517                         pr_err("Invalid line %d, missing state definitions\n",
2518                                num);
2519                         ret = -EINVAL;
2520                         break;
2521                 }
2522                 ptr++;
2523                 lba_map = core_alua_allocate_lba_map(&lba_list,
2524                                                      start_lba, end_lba);
2525                 if (IS_ERR(lba_map)) {
2526                         ret = PTR_ERR(lba_map);
2527                         break;
2528                 }
2529                 pg = 0;
2530                 while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2531                         switch (state) {
2532                         case 'O':
2533                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2534                                 break;
2535                         case 'A':
2536                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2537                                 break;
2538                         case 'S':
2539                                 alua_state = ALUA_ACCESS_STATE_STANDBY;
2540                                 break;
2541                         case 'U':
2542                                 alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2543                                 break;
2544                         default:
2545                                 pr_err("Invalid ALUA state '%c'\n", state);
2546                                 ret = -EINVAL;
2547                                 goto out;
2548                         }
2549
2550                         ret = core_alua_allocate_lba_map_mem(lba_map,
2551                                                              pg_id, alua_state);
2552                         if (ret) {
2553                                 pr_err("Invalid target descriptor %d:%c "
2554                                        "at line %d\n",
2555                                        pg_id, state, num);
2556                                 break;
2557                         }
2558                         pg++;
2559                         ptr = strchr(ptr, ' ');
2560                         if (ptr)
2561                                 ptr++;
2562                         else
2563                                 break;
2564                 }
2565                 if (pg_num == -1)
2566                     pg_num = pg;
2567                 else if (pg != pg_num) {
2568                         pr_err("Only %d from %d port groups definitions "
2569                                "at line %d\n", pg, pg_num, num);
2570                         ret = -EINVAL;
2571                         break;
2572                 }
2573                 num++;
2574         }
2575 out:
2576         if (ret) {
2577                 core_alua_free_lba_map(&lba_list);
2578                 count = ret;
2579         } else
2580                 core_alua_set_lba_map(dev, &lba_list,
2581                                       segment_size, segment_mult);
2582         kfree(orig);
2583         return count;
2584 }
2585
2586 CONFIGFS_ATTR_RO(target_dev_, info);
2587 CONFIGFS_ATTR_WO(target_dev_, control);
2588 CONFIGFS_ATTR(target_dev_, alias);
2589 CONFIGFS_ATTR(target_dev_, udev_path);
2590 CONFIGFS_ATTR(target_dev_, enable);
2591 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2592 CONFIGFS_ATTR(target_dev_, lba_map);
2593
2594 static struct configfs_attribute *target_core_dev_attrs[] = {
2595         &target_dev_attr_info,
2596         &target_dev_attr_control,
2597         &target_dev_attr_alias,
2598         &target_dev_attr_udev_path,
2599         &target_dev_attr_enable,
2600         &target_dev_attr_alua_lu_gp,
2601         &target_dev_attr_lba_map,
2602         NULL,
2603 };
2604
2605 static void target_core_dev_release(struct config_item *item)
2606 {
2607         struct config_group *dev_cg = to_config_group(item);
2608         struct se_device *dev =
2609                 container_of(dev_cg, struct se_device, dev_group);
2610
2611         target_free_device(dev);
2612 }
2613
2614 /*
2615  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2616  * within target_fabric_port_link()
2617  */
2618 struct configfs_item_operations target_core_dev_item_ops = {
2619         .release                = target_core_dev_release,
2620 };
2621
2622 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2623
2624 /* End functions for struct config_item_type tb_dev_cit */
2625
2626 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2627
2628 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2629 {
2630         return container_of(to_config_group(item), struct t10_alua_lu_gp,
2631                         lu_gp_group);
2632 }
2633
2634 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2635 {
2636         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2637
2638         if (!lu_gp->lu_gp_valid_id)
2639                 return 0;
2640         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2641 }
2642
2643 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2644                 const char *page, size_t count)
2645 {
2646         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2647         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2648         unsigned long lu_gp_id;
2649         int ret;
2650
2651         ret = kstrtoul(page, 0, &lu_gp_id);
2652         if (ret < 0) {
2653                 pr_err("kstrtoul() returned %d for"
2654                         " lu_gp_id\n", ret);
2655                 return ret;
2656         }
2657         if (lu_gp_id > 0x0000ffff) {
2658                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2659                         " 0x0000ffff\n", lu_gp_id);
2660                 return -EINVAL;
2661         }
2662
2663         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2664         if (ret < 0)
2665                 return -EINVAL;
2666
2667         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2668                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2669                 config_item_name(&alua_lu_gp_cg->cg_item),
2670                 lu_gp->lu_gp_id);
2671
2672         return count;
2673 }
2674
2675 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2676 {
2677         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2678         struct se_device *dev;
2679         struct se_hba *hba;
2680         struct t10_alua_lu_gp_member *lu_gp_mem;
2681         ssize_t len = 0, cur_len;
2682         unsigned char buf[LU_GROUP_NAME_BUF] = { };
2683
2684         spin_lock(&lu_gp->lu_gp_lock);
2685         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2686                 dev = lu_gp_mem->lu_gp_mem_dev;
2687                 hba = dev->se_hba;
2688
2689                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2690                         config_item_name(&hba->hba_group.cg_item),
2691                         config_item_name(&dev->dev_group.cg_item));
2692                 cur_len++; /* Extra byte for NULL terminator */
2693
2694                 if ((cur_len + len) > PAGE_SIZE) {
2695                         pr_warn("Ran out of lu_gp_show_attr"
2696                                 "_members buffer\n");
2697                         break;
2698                 }
2699                 memcpy(page+len, buf, cur_len);
2700                 len += cur_len;
2701         }
2702         spin_unlock(&lu_gp->lu_gp_lock);
2703
2704         return len;
2705 }
2706
2707 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2708 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2709
2710 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2711         &target_lu_gp_attr_lu_gp_id,
2712         &target_lu_gp_attr_members,
2713         NULL,
2714 };
2715
2716 static void target_core_alua_lu_gp_release(struct config_item *item)
2717 {
2718         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2719                         struct t10_alua_lu_gp, lu_gp_group);
2720
2721         core_alua_free_lu_gp(lu_gp);
2722 }
2723
2724 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2725         .release                = target_core_alua_lu_gp_release,
2726 };
2727
2728 static const struct config_item_type target_core_alua_lu_gp_cit = {
2729         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2730         .ct_attrs               = target_core_alua_lu_gp_attrs,
2731         .ct_owner               = THIS_MODULE,
2732 };
2733
2734 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2735
2736 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2737
2738 static struct config_group *target_core_alua_create_lu_gp(
2739         struct config_group *group,
2740         const char *name)
2741 {
2742         struct t10_alua_lu_gp *lu_gp;
2743         struct config_group *alua_lu_gp_cg = NULL;
2744         struct config_item *alua_lu_gp_ci = NULL;
2745
2746         lu_gp = core_alua_allocate_lu_gp(name, 0);
2747         if (IS_ERR(lu_gp))
2748                 return NULL;
2749
2750         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2751         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2752
2753         config_group_init_type_name(alua_lu_gp_cg, name,
2754                         &target_core_alua_lu_gp_cit);
2755
2756         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2757                 " Group: core/alua/lu_gps/%s\n",
2758                 config_item_name(alua_lu_gp_ci));
2759
2760         return alua_lu_gp_cg;
2761
2762 }
2763
2764 static void target_core_alua_drop_lu_gp(
2765         struct config_group *group,
2766         struct config_item *item)
2767 {
2768         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2769                         struct t10_alua_lu_gp, lu_gp_group);
2770
2771         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2772                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2773                 config_item_name(item), lu_gp->lu_gp_id);
2774         /*
2775          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2776          * -> target_core_alua_lu_gp_release()
2777          */
2778         config_item_put(item);
2779 }
2780
2781 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2782         .make_group             = &target_core_alua_create_lu_gp,
2783         .drop_item              = &target_core_alua_drop_lu_gp,
2784 };
2785
2786 static const struct config_item_type target_core_alua_lu_gps_cit = {
2787         .ct_item_ops            = NULL,
2788         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2789         .ct_owner               = THIS_MODULE,
2790 };
2791
2792 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2793
2794 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2795
2796 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2797 {
2798         return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2799                         tg_pt_gp_group);
2800 }
2801
2802 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2803                 char *page)
2804 {
2805         return sprintf(page, "%d\n",
2806                        to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2807 }
2808
2809 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2810                 const char *page, size_t count)
2811 {
2812         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2813         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2814         unsigned long tmp;
2815         int new_state, ret;
2816
2817         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2818                 pr_err("Unable to do implicit ALUA on invalid tg_pt_gp ID\n");
2819                 return -EINVAL;
2820         }
2821         if (!target_dev_configured(dev)) {
2822                 pr_err("Unable to set alua_access_state while device is"
2823                        " not configured\n");
2824                 return -ENODEV;
2825         }
2826
2827         ret = kstrtoul(page, 0, &tmp);
2828         if (ret < 0) {
2829                 pr_err("Unable to extract new ALUA access state from"
2830                                 " %s\n", page);
2831                 return ret;
2832         }
2833         new_state = (int)tmp;
2834
2835         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2836                 pr_err("Unable to process implicit configfs ALUA"
2837                         " transition while TPGS_IMPLICIT_ALUA is disabled\n");
2838                 return -EINVAL;
2839         }
2840         if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2841             new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2842                 /* LBA DEPENDENT is only allowed with implicit ALUA */
2843                 pr_err("Unable to process implicit configfs ALUA transition"
2844                        " while explicit ALUA management is enabled\n");
2845                 return -EINVAL;
2846         }
2847
2848         ret = core_alua_do_port_transition(tg_pt_gp, dev,
2849                                         NULL, NULL, new_state, 0);
2850         return (!ret) ? count : -EINVAL;
2851 }
2852
2853 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2854                 char *page)
2855 {
2856         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2857         return sprintf(page, "%s\n",
2858                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2859 }
2860
2861 static ssize_t target_tg_pt_gp_alua_access_status_store(
2862                 struct config_item *item, const char *page, size_t count)
2863 {
2864         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2865         unsigned long tmp;
2866         int new_status, ret;
2867
2868         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2869                 pr_err("Unable to set ALUA access status on invalid tg_pt_gp ID\n");
2870                 return -EINVAL;
2871         }
2872
2873         ret = kstrtoul(page, 0, &tmp);
2874         if (ret < 0) {
2875                 pr_err("Unable to extract new ALUA access status"
2876                                 " from %s\n", page);
2877                 return ret;
2878         }
2879         new_status = (int)tmp;
2880
2881         if ((new_status != ALUA_STATUS_NONE) &&
2882             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2883             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2884                 pr_err("Illegal ALUA access status: 0x%02x\n",
2885                                 new_status);
2886                 return -EINVAL;
2887         }
2888
2889         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2890         return count;
2891 }
2892
2893 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2894                 char *page)
2895 {
2896         return core_alua_show_access_type(to_tg_pt_gp(item), page);
2897 }
2898
2899 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2900                 const char *page, size_t count)
2901 {
2902         return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2903 }
2904
2905 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
2906 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
2907                 struct config_item *item, char *p)                      \
2908 {                                                                       \
2909         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2910         return sprintf(p, "%d\n",                                       \
2911                 !!(t->tg_pt_gp_alua_supported_states & _bit));          \
2912 }                                                                       \
2913                                                                         \
2914 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
2915                 struct config_item *item, const char *p, size_t c)      \
2916 {                                                                       \
2917         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2918         unsigned long tmp;                                              \
2919         int ret;                                                        \
2920                                                                         \
2921         if (!t->tg_pt_gp_valid_id) {                                    \
2922                 pr_err("Unable to set " #_name " ALUA state on invalid tg_pt_gp ID\n"); \
2923                 return -EINVAL;                                         \
2924         }                                                               \
2925                                                                         \
2926         ret = kstrtoul(p, 0, &tmp);                                     \
2927         if (ret < 0) {                                                  \
2928                 pr_err("Invalid value '%s', must be '0' or '1'\n", p);  \
2929                 return -EINVAL;                                         \
2930         }                                                               \
2931         if (tmp > 1) {                                                  \
2932                 pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2933                 return -EINVAL;                                         \
2934         }                                                               \
2935         if (tmp)                                                        \
2936                 t->tg_pt_gp_alua_supported_states |= _bit;              \
2937         else                                                            \
2938                 t->tg_pt_gp_alua_supported_states &= ~_bit;             \
2939                                                                         \
2940         return c;                                                       \
2941 }
2942
2943 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2944 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2945 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2946 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2947 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2948 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2949 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2950
2951 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2952                 struct config_item *item, char *page)
2953 {
2954         return sprintf(page, "%d\n",
2955                 to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2956 }
2957
2958 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2959                 struct config_item *item, const char *page, size_t count)
2960 {
2961         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2962         unsigned long tmp;
2963         int ret;
2964
2965         ret = kstrtoul(page, 0, &tmp);
2966         if (ret < 0) {
2967                 pr_err("Unable to extract alua_write_metadata\n");
2968                 return ret;
2969         }
2970
2971         if ((tmp != 0) && (tmp != 1)) {
2972                 pr_err("Illegal value for alua_write_metadata:"
2973                         " %lu\n", tmp);
2974                 return -EINVAL;
2975         }
2976         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2977
2978         return count;
2979 }
2980
2981 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2982                 char *page)
2983 {
2984         return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2985 }
2986
2987 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2988                 const char *page, size_t count)
2989 {
2990         return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2991                         count);
2992 }
2993
2994 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2995                 char *page)
2996 {
2997         return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2998 }
2999
3000 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
3001                 const char *page, size_t count)
3002 {
3003         return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
3004                         count);
3005 }
3006
3007 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
3008                 struct config_item *item, char *page)
3009 {
3010         return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
3011 }
3012
3013 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
3014                 struct config_item *item, const char *page, size_t count)
3015 {
3016         return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
3017                         count);
3018 }
3019
3020 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
3021                 char *page)
3022 {
3023         return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
3024 }
3025
3026 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
3027                 const char *page, size_t count)
3028 {
3029         return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
3030 }
3031
3032 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
3033                 char *page)
3034 {
3035         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3036
3037         if (!tg_pt_gp->tg_pt_gp_valid_id)
3038                 return 0;
3039         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
3040 }
3041
3042 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
3043                 const char *page, size_t count)
3044 {
3045         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3046         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3047         unsigned long tg_pt_gp_id;
3048         int ret;
3049
3050         ret = kstrtoul(page, 0, &tg_pt_gp_id);
3051         if (ret < 0) {
3052                 pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
3053                        page);
3054                 return ret;
3055         }
3056         if (tg_pt_gp_id > 0x0000ffff) {
3057                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
3058                        tg_pt_gp_id);
3059                 return -EINVAL;
3060         }
3061
3062         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
3063         if (ret < 0)
3064                 return -EINVAL;
3065
3066         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
3067                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
3068                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
3069                 tg_pt_gp->tg_pt_gp_id);
3070
3071         return count;
3072 }
3073
3074 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
3075                 char *page)
3076 {
3077         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
3078         struct se_lun *lun;
3079         ssize_t len = 0, cur_len;
3080         unsigned char buf[TG_PT_GROUP_NAME_BUF] = { };
3081
3082         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
3083         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
3084                         lun_tg_pt_gp_link) {
3085                 struct se_portal_group *tpg = lun->lun_tpg;
3086
3087                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
3088                         "/%s\n", tpg->se_tpg_tfo->fabric_name,
3089                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
3090                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
3091                         config_item_name(&lun->lun_group.cg_item));
3092                 cur_len++; /* Extra byte for NULL terminator */
3093
3094                 if ((cur_len + len) > PAGE_SIZE) {
3095                         pr_warn("Ran out of lu_gp_show_attr"
3096                                 "_members buffer\n");
3097                         break;
3098                 }
3099                 memcpy(page+len, buf, cur_len);
3100                 len += cur_len;
3101         }
3102         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
3103
3104         return len;
3105 }
3106
3107 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
3108 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
3109 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
3110 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
3111 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
3112 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
3113 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
3114 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
3115 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
3116 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
3117 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
3118 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
3119 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
3120 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
3121 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
3122 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
3123 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
3124
3125 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
3126         &target_tg_pt_gp_attr_alua_access_state,
3127         &target_tg_pt_gp_attr_alua_access_status,
3128         &target_tg_pt_gp_attr_alua_access_type,
3129         &target_tg_pt_gp_attr_alua_support_transitioning,
3130         &target_tg_pt_gp_attr_alua_support_offline,
3131         &target_tg_pt_gp_attr_alua_support_lba_dependent,
3132         &target_tg_pt_gp_attr_alua_support_unavailable,
3133         &target_tg_pt_gp_attr_alua_support_standby,
3134         &target_tg_pt_gp_attr_alua_support_active_nonoptimized,
3135         &target_tg_pt_gp_attr_alua_support_active_optimized,
3136         &target_tg_pt_gp_attr_alua_write_metadata,
3137         &target_tg_pt_gp_attr_nonop_delay_msecs,
3138         &target_tg_pt_gp_attr_trans_delay_msecs,
3139         &target_tg_pt_gp_attr_implicit_trans_secs,
3140         &target_tg_pt_gp_attr_preferred,
3141         &target_tg_pt_gp_attr_tg_pt_gp_id,
3142         &target_tg_pt_gp_attr_members,
3143         NULL,
3144 };
3145
3146 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
3147 {
3148         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3149                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3150
3151         core_alua_free_tg_pt_gp(tg_pt_gp);
3152 }
3153
3154 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
3155         .release                = target_core_alua_tg_pt_gp_release,
3156 };
3157
3158 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
3159         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
3160         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
3161         .ct_owner               = THIS_MODULE,
3162 };
3163
3164 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
3165
3166 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3167
3168 static struct config_group *target_core_alua_create_tg_pt_gp(
3169         struct config_group *group,
3170         const char *name)
3171 {
3172         struct t10_alua *alua = container_of(group, struct t10_alua,
3173                                         alua_tg_pt_gps_group);
3174         struct t10_alua_tg_pt_gp *tg_pt_gp;
3175         struct config_group *alua_tg_pt_gp_cg = NULL;
3176         struct config_item *alua_tg_pt_gp_ci = NULL;
3177
3178         tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
3179         if (!tg_pt_gp)
3180                 return NULL;
3181
3182         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
3183         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
3184
3185         config_group_init_type_name(alua_tg_pt_gp_cg, name,
3186                         &target_core_alua_tg_pt_gp_cit);
3187
3188         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
3189                 " Group: alua/tg_pt_gps/%s\n",
3190                 config_item_name(alua_tg_pt_gp_ci));
3191
3192         return alua_tg_pt_gp_cg;
3193 }
3194
3195 static void target_core_alua_drop_tg_pt_gp(
3196         struct config_group *group,
3197         struct config_item *item)
3198 {
3199         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
3200                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
3201
3202         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
3203                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
3204                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
3205         /*
3206          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
3207          * -> target_core_alua_tg_pt_gp_release().
3208          */
3209         config_item_put(item);
3210 }
3211
3212 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
3213         .make_group             = &target_core_alua_create_tg_pt_gp,
3214         .drop_item              = &target_core_alua_drop_tg_pt_gp,
3215 };
3216
3217 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
3218
3219 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
3220
3221 /* Start functions for struct config_item_type target_core_alua_cit */
3222
3223 /*
3224  * target_core_alua_cit is a ConfigFS group that lives under
3225  * /sys/kernel/config/target/core/alua.  There are default groups
3226  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
3227  * target_core_alua_cit in target_core_init_configfs() below.
3228  */
3229 static const struct config_item_type target_core_alua_cit = {
3230         .ct_item_ops            = NULL,
3231         .ct_attrs               = NULL,
3232         .ct_owner               = THIS_MODULE,
3233 };
3234
3235 /* End functions for struct config_item_type target_core_alua_cit */
3236
3237 /* Start functions for struct config_item_type tb_dev_stat_cit */
3238
3239 static struct config_group *target_core_stat_mkdir(
3240         struct config_group *group,
3241         const char *name)
3242 {
3243         return ERR_PTR(-ENOSYS);
3244 }
3245
3246 static void target_core_stat_rmdir(
3247         struct config_group *group,
3248         struct config_item *item)
3249 {
3250         return;
3251 }
3252
3253 static struct configfs_group_operations target_core_stat_group_ops = {
3254         .make_group             = &target_core_stat_mkdir,
3255         .drop_item              = &target_core_stat_rmdir,
3256 };
3257
3258 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
3259
3260 /* End functions for struct config_item_type tb_dev_stat_cit */
3261
3262 /* Start functions for struct config_item_type target_core_hba_cit */
3263
3264 static struct config_group *target_core_make_subdev(
3265         struct config_group *group,
3266         const char *name)
3267 {
3268         struct t10_alua_tg_pt_gp *tg_pt_gp;
3269         struct config_item *hba_ci = &group->cg_item;
3270         struct se_hba *hba = item_to_hba(hba_ci);
3271         struct target_backend *tb = hba->backend;
3272         struct se_device *dev;
3273         int errno = -ENOMEM, ret;
3274
3275         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
3276         if (ret)
3277                 return ERR_PTR(ret);
3278
3279         dev = target_alloc_device(hba, name);
3280         if (!dev)
3281                 goto out_unlock;
3282
3283         config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
3284
3285         config_group_init_type_name(&dev->dev_action_group, "action",
3286                         &tb->tb_dev_action_cit);
3287         configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
3288
3289         config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
3290                         &tb->tb_dev_attrib_cit);
3291         configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
3292
3293         config_group_init_type_name(&dev->dev_pr_group, "pr",
3294                         &tb->tb_dev_pr_cit);
3295         configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
3296
3297         config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
3298                         &tb->tb_dev_wwn_cit);
3299         configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
3300                         &dev->dev_group);
3301
3302         config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
3303                         "alua", &tb->tb_dev_alua_tg_pt_gps_cit);
3304         configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
3305                         &dev->dev_group);
3306
3307         config_group_init_type_name(&dev->dev_stat_grps.stat_group,
3308                         "statistics", &tb->tb_dev_stat_cit);
3309         configfs_add_default_group(&dev->dev_stat_grps.stat_group,
3310                         &dev->dev_group);
3311
3312         /*
3313          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
3314          */
3315         tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
3316         if (!tg_pt_gp)
3317                 goto out_free_device;
3318         dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
3319
3320         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
3321                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
3322         configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
3323                         &dev->t10_alua.alua_tg_pt_gps_group);
3324
3325         /*
3326          * Add core/$HBA/$DEV/statistics/ default groups
3327          */
3328         target_stat_setup_dev_default_groups(dev);
3329
3330         mutex_lock(&target_devices_lock);
3331         target_devices++;
3332         mutex_unlock(&target_devices_lock);
3333
3334         mutex_unlock(&hba->hba_access_mutex);
3335         return &dev->dev_group;
3336
3337 out_free_device:
3338         target_free_device(dev);
3339 out_unlock:
3340         mutex_unlock(&hba->hba_access_mutex);
3341         return ERR_PTR(errno);
3342 }
3343
3344 static void target_core_drop_subdev(
3345         struct config_group *group,
3346         struct config_item *item)
3347 {
3348         struct config_group *dev_cg = to_config_group(item);
3349         struct se_device *dev =
3350                 container_of(dev_cg, struct se_device, dev_group);
3351         struct se_hba *hba;
3352
3353         hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3354
3355         mutex_lock(&hba->hba_access_mutex);
3356
3357         configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3358         configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3359
3360         /*
3361          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3362          * directly from target_core_alua_tg_pt_gp_release().
3363          */
3364         dev->t10_alua.default_tg_pt_gp = NULL;
3365
3366         configfs_remove_default_groups(dev_cg);
3367
3368         /*
3369          * se_dev is released from target_core_dev_item_ops->release()
3370          */
3371         config_item_put(item);
3372
3373         mutex_lock(&target_devices_lock);
3374         target_devices--;
3375         mutex_unlock(&target_devices_lock);
3376
3377         mutex_unlock(&hba->hba_access_mutex);
3378 }
3379
3380 static struct configfs_group_operations target_core_hba_group_ops = {
3381         .make_group             = target_core_make_subdev,
3382         .drop_item              = target_core_drop_subdev,
3383 };
3384
3385
3386 static inline struct se_hba *to_hba(struct config_item *item)
3387 {
3388         return container_of(to_config_group(item), struct se_hba, hba_group);
3389 }
3390
3391 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3392 {
3393         struct se_hba *hba = to_hba(item);
3394
3395         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3396                         hba->hba_id, hba->backend->ops->name,
3397                         TARGET_CORE_VERSION);
3398 }
3399
3400 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3401 {
3402         struct se_hba *hba = to_hba(item);
3403         int hba_mode = 0;
3404
3405         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3406                 hba_mode = 1;
3407
3408         return sprintf(page, "%d\n", hba_mode);
3409 }
3410
3411 static ssize_t target_hba_mode_store(struct config_item *item,
3412                 const char *page, size_t count)
3413 {
3414         struct se_hba *hba = to_hba(item);
3415         unsigned long mode_flag;
3416         int ret;
3417
3418         if (hba->backend->ops->pmode_enable_hba == NULL)
3419                 return -EINVAL;
3420
3421         ret = kstrtoul(page, 0, &mode_flag);
3422         if (ret < 0) {
3423                 pr_err("Unable to extract hba mode flag: %d\n", ret);
3424                 return ret;
3425         }
3426
3427         if (hba->dev_count) {
3428                 pr_err("Unable to set hba_mode with active devices\n");
3429                 return -EINVAL;
3430         }
3431
3432         ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3433         if (ret < 0)
3434                 return -EINVAL;
3435         if (ret > 0)
3436                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3437         else if (ret == 0)
3438                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3439
3440         return count;
3441 }
3442
3443 CONFIGFS_ATTR_RO(target_, hba_info);
3444 CONFIGFS_ATTR(target_, hba_mode);
3445
3446 static void target_core_hba_release(struct config_item *item)
3447 {
3448         struct se_hba *hba = container_of(to_config_group(item),
3449                                 struct se_hba, hba_group);
3450         core_delete_hba(hba);
3451 }
3452
3453 static struct configfs_attribute *target_core_hba_attrs[] = {
3454         &target_attr_hba_info,
3455         &target_attr_hba_mode,
3456         NULL,
3457 };
3458
3459 static struct configfs_item_operations target_core_hba_item_ops = {
3460         .release                = target_core_hba_release,
3461 };
3462
3463 static const struct config_item_type target_core_hba_cit = {
3464         .ct_item_ops            = &target_core_hba_item_ops,
3465         .ct_group_ops           = &target_core_hba_group_ops,
3466         .ct_attrs               = target_core_hba_attrs,
3467         .ct_owner               = THIS_MODULE,
3468 };
3469
3470 static struct config_group *target_core_call_addhbatotarget(
3471         struct config_group *group,
3472         const char *name)
3473 {
3474         char *se_plugin_str, *str, *str2;
3475         struct se_hba *hba;
3476         char buf[TARGET_CORE_NAME_MAX_LEN] = { };
3477         unsigned long plugin_dep_id = 0;
3478         int ret;
3479
3480         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3481                 pr_err("Passed *name strlen(): %d exceeds"
3482                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3483                         TARGET_CORE_NAME_MAX_LEN);
3484                 return ERR_PTR(-ENAMETOOLONG);
3485         }
3486         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3487
3488         str = strstr(buf, "_");
3489         if (!str) {
3490                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3491                 return ERR_PTR(-EINVAL);
3492         }
3493         se_plugin_str = buf;
3494         /*
3495          * Special case for subsystem plugins that have "_" in their names.
3496          * Namely rd_direct and rd_mcp..
3497          */
3498         str2 = strstr(str+1, "_");
3499         if (str2) {
3500                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3501                 str2++; /* Skip to start of plugin dependent ID */
3502                 str = str2;
3503         } else {
3504                 *str = '\0'; /* Terminate for *se_plugin_str */
3505                 str++; /* Skip to start of plugin dependent ID */
3506         }
3507
3508         ret = kstrtoul(str, 0, &plugin_dep_id);
3509         if (ret < 0) {
3510                 pr_err("kstrtoul() returned %d for"
3511                                 " plugin_dep_id\n", ret);
3512                 return ERR_PTR(ret);
3513         }
3514         /*
3515          * Load up TCM subsystem plugins if they have not already been loaded.
3516          */
3517         transport_subsystem_check_init();
3518
3519         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3520         if (IS_ERR(hba))
3521                 return ERR_CAST(hba);
3522
3523         config_group_init_type_name(&hba->hba_group, name,
3524                         &target_core_hba_cit);
3525
3526         return &hba->hba_group;
3527 }
3528
3529 static void target_core_call_delhbafromtarget(
3530         struct config_group *group,
3531         struct config_item *item)
3532 {
3533         /*
3534          * core_delete_hba() is called from target_core_hba_item_ops->release()
3535          * -> target_core_hba_release()
3536          */
3537         config_item_put(item);
3538 }
3539
3540 static struct configfs_group_operations target_core_group_ops = {
3541         .make_group     = target_core_call_addhbatotarget,
3542         .drop_item      = target_core_call_delhbafromtarget,
3543 };
3544
3545 static const struct config_item_type target_core_cit = {
3546         .ct_item_ops    = NULL,
3547         .ct_group_ops   = &target_core_group_ops,
3548         .ct_attrs       = NULL,
3549         .ct_owner       = THIS_MODULE,
3550 };
3551
3552 /* Stop functions for struct config_item_type target_core_hba_cit */
3553
3554 void target_setup_backend_cits(struct target_backend *tb)
3555 {
3556         target_core_setup_dev_cit(tb);
3557         target_core_setup_dev_action_cit(tb);
3558         target_core_setup_dev_attrib_cit(tb);
3559         target_core_setup_dev_pr_cit(tb);
3560         target_core_setup_dev_wwn_cit(tb);
3561         target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3562         target_core_setup_dev_stat_cit(tb);
3563 }
3564
3565 static void target_init_dbroot(void)
3566 {
3567         struct file *fp;
3568
3569         snprintf(db_root_stage, DB_ROOT_LEN, DB_ROOT_PREFERRED);
3570         fp = filp_open(db_root_stage, O_RDONLY, 0);
3571         if (IS_ERR(fp)) {
3572                 pr_err("db_root: cannot open: %s\n", db_root_stage);
3573                 return;
3574         }
3575         if (!S_ISDIR(file_inode(fp)->i_mode)) {
3576                 filp_close(fp, NULL);
3577                 pr_err("db_root: not a valid directory: %s\n", db_root_stage);
3578                 return;
3579         }
3580         filp_close(fp, NULL);
3581
3582         strncpy(db_root, db_root_stage, DB_ROOT_LEN);
3583         pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
3584 }
3585
3586 static int __init target_core_init_configfs(void)
3587 {
3588         struct configfs_subsystem *subsys = &target_core_fabrics;
3589         struct t10_alua_lu_gp *lu_gp;
3590         int ret;
3591
3592         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3593                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3594                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3595
3596         config_group_init(&subsys->su_group);
3597         mutex_init(&subsys->su_mutex);
3598
3599         ret = init_se_kmem_caches();
3600         if (ret < 0)
3601                 return ret;
3602         /*
3603          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3604          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3605          */
3606         config_group_init_type_name(&target_core_hbagroup, "core",
3607                         &target_core_cit);
3608         configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3609
3610         /*
3611          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3612          */
3613         config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3614         configfs_add_default_group(&alua_group, &target_core_hbagroup);
3615
3616         /*
3617          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3618          * groups under /sys/kernel/config/target/core/alua/
3619          */
3620         config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3621                         &target_core_alua_lu_gps_cit);
3622         configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3623
3624         /*
3625          * Add core/alua/lu_gps/default_lu_gp
3626          */
3627         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3628         if (IS_ERR(lu_gp)) {
3629                 ret = -ENOMEM;
3630                 goto out_global;
3631         }
3632
3633         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3634                                 &target_core_alua_lu_gp_cit);
3635         configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3636
3637         default_lu_gp = lu_gp;
3638
3639         /*
3640          * Register the target_core_mod subsystem with configfs.
3641          */
3642         ret = configfs_register_subsystem(subsys);
3643         if (ret < 0) {
3644                 pr_err("Error %d while registering subsystem %s\n",
3645                         ret, subsys->su_group.cg_item.ci_namebuf);
3646                 goto out_global;
3647         }
3648         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3649                 " Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3650                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3651         /*
3652          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3653          */
3654         ret = rd_module_init();
3655         if (ret < 0)
3656                 goto out;
3657
3658         ret = core_dev_setup_virtual_lun0();
3659         if (ret < 0)
3660                 goto out;
3661
3662         ret = target_xcopy_setup_pt();
3663         if (ret < 0)
3664                 goto out;
3665
3666         target_init_dbroot();
3667
3668         return 0;
3669
3670 out:
3671         configfs_unregister_subsystem(subsys);
3672         core_dev_release_virtual_lun0();
3673         rd_module_exit();
3674 out_global:
3675         if (default_lu_gp) {
3676                 core_alua_free_lu_gp(default_lu_gp);
3677                 default_lu_gp = NULL;
3678         }
3679         release_se_kmem_caches();
3680         return ret;
3681 }
3682
3683 static void __exit target_core_exit_configfs(void)
3684 {
3685         configfs_remove_default_groups(&alua_lu_gps_group);
3686         configfs_remove_default_groups(&alua_group);
3687         configfs_remove_default_groups(&target_core_hbagroup);
3688
3689         /*
3690          * We expect subsys->su_group.default_groups to be released
3691          * by configfs subsystem provider logic..
3692          */
3693         configfs_unregister_subsystem(&target_core_fabrics);
3694
3695         core_alua_free_lu_gp(default_lu_gp);
3696         default_lu_gp = NULL;
3697
3698         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3699                         " Infrastructure\n");
3700
3701         core_dev_release_virtual_lun0();
3702         rd_module_exit();
3703         target_xcopy_release_pt();
3704         release_se_kmem_caches();
3705 }
3706
3707 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3708 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3709 MODULE_LICENSE("GPL");
3710
3711 module_init(target_core_init_configfs);
3712 module_exit(target_core_exit_configfs);