drivers/target/target_core_configfs.c

   1 /*******************************************************************************
   2  * Filename:  target_core_configfs.c
   3  *
   4  * This file contains ConfigFS logic for the Generic Target Engine project.
   5  *
   6  * (c) Copyright 2008-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  ****************************************************************************/
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <generated/utsrelease.h>
  26 #include <linux/utsname.h>
  27 #include <linux/init.h>
  28 #include <linux/fs.h>
  29 #include <linux/namei.h>
  30 #include <linux/slab.h>
  31 #include <linux/types.h>
  32 #include <linux/delay.h>
  33 #include <linux/unistd.h>
  34 #include <linux/string.h>
  35 #include <linux/parser.h>
  36 #include <linux/syscalls.h>
  37 #include <linux/configfs.h>
  38 #include <linux/spinlock.h>
  39
  40 #include <target/target_core_base.h>
  41 #include <target/target_core_backend.h>
  42 #include <target/target_core_fabric.h>
  43
  44 #include "target_core_internal.h"
  45 #include "target_core_alua.h"
  46 #include "target_core_pr.h"
  47 #include "target_core_rd.h"
  48 #include "target_core_xcopy.h"
  49
  50 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
  51 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  52 {                                                                       \
  53         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  54                                                                         \
  55         cit->ct_item_ops = _item_ops;                                   \
  56         cit->ct_group_ops = _group_ops;                                 \
  57         cit->ct_attrs = _attrs;                                         \
  58         cit->ct_owner = tb->ops->owner;                                 \
  59         pr_debug("Setup generic %s\n", __stringify(_name));             \
  60 }
  61
  62 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)                  \
  63 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
  64 {                                                                       \
  65         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
  66                                                                         \
  67         cit->ct_item_ops = _item_ops;                                   \
  68         cit->ct_group_ops = _group_ops;                                 \
  69         cit->ct_attrs = tb->ops->tb_##_name##_attrs;                    \
  70         cit->ct_owner = tb->ops->owner;                                 \
  71         pr_debug("Setup generic %s\n", __stringify(_name));             \
  72 }
  73
  74 extern struct t10_alua_lu_gp *default_lu_gp;
  75
  76 static LIST_HEAD(g_tf_list);
  77 static DEFINE_MUTEX(g_tf_lock);
  78
  79 static struct config_group target_core_hbagroup;
  80 static struct config_group alua_group;
  81 static struct config_group alua_lu_gps_group;
  82
  83 static inline struct se_hba *
  84 item_to_hba(struct config_item *item)
  85 {
  86         return container_of(to_config_group(item), struct se_hba, hba_group);
  87 }
  88
  89 /*
  90  * Attributes for /sys/kernel/config/target/
  91  */
  92 static ssize_t target_core_item_version_show(struct config_item *item,
  93                 char *page)
  94 {
  95         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  96                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
  97                 utsname()->sysname, utsname()->machine);
  98 }
  99
 100 CONFIGFS_ATTR_RO(target_core_item_, version);
 101
 102 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
 103 static char db_root_stage[DB_ROOT_LEN];
 104
 105 static ssize_t target_core_item_dbroot_show(struct config_item *item,
 106                                             char *page)
 107 {
 108         return sprintf(page, "%s\n", db_root);
 109 }
 110
 111 static ssize_t target_core_item_dbroot_store(struct config_item *item,
 112                                         const char *page, size_t count)
 113 {
 114         ssize_t read_bytes;
 115         struct file *fp;
 116
 117         mutex_lock(&g_tf_lock);
 118         if (!list_empty(&g_tf_list)) {
 119                 mutex_unlock(&g_tf_lock);
 120                 pr_err("db_root: cannot be changed: target drivers registered");
 121                 return -EINVAL;
 122         }
 123
 124         if (count > (DB_ROOT_LEN - 1)) {
 125                 mutex_unlock(&g_tf_lock);
 126                 pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
 127                        (int)count, DB_ROOT_LEN - 1);
 128                 return -EINVAL;
 129         }
 130
 131         read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
 132         if (!read_bytes) {
 133                 mutex_unlock(&g_tf_lock);
 134                 return -EINVAL;
 135         }
 136         if (db_root_stage[read_bytes - 1] == '\n')
 137                 db_root_stage[read_bytes - 1] = '\0';
 138
 139         /* validate new db root before accepting it */
 140         fp = filp_open(db_root_stage, O_RDONLY, 0);
 141         if (IS_ERR(fp)) {
 142                 mutex_unlock(&g_tf_lock);
 143                 pr_err("db_root: cannot open: %s\n", db_root_stage);
 144                 return -EINVAL;
 145         }
 146         if (!S_ISDIR(file_inode(fp)->i_mode)) {
 147                 filp_close(fp, NULL);
 148                 mutex_unlock(&g_tf_lock);
 149                 pr_err("db_root: not a directory: %s\n", db_root_stage);
 150                 return -EINVAL;
 151         }
 152         filp_close(fp, NULL);
 153
 154         strncpy(db_root, db_root_stage, read_bytes);
 155
 156         mutex_unlock(&g_tf_lock);
 157
 158         return read_bytes;
 159 }
 160
 161 CONFIGFS_ATTR(target_core_item_, dbroot);
 162
 163 static struct target_fabric_configfs *target_core_get_fabric(
 164         const char *name)
 165 {
 166         struct target_fabric_configfs *tf;
 167
 168         if (!name)
 169                 return NULL;
 170
 171         mutex_lock(&g_tf_lock);
 172         list_for_each_entry(tf, &g_tf_list, tf_list) {
 173                 if (!strcmp(tf->tf_ops->name, name)) {
 174                         atomic_inc(&tf->tf_access_cnt);
 175                         mutex_unlock(&g_tf_lock);
 176                         return tf;
 177                 }
 178         }
 179         mutex_unlock(&g_tf_lock);
 180
 181         return NULL;
 182 }
 183
 184 /*
 185  * Called from struct target_core_group_ops->make_group()
 186  */
 187 static struct config_group *target_core_register_fabric(
 188         struct config_group *group,
 189         const char *name)
 190 {
 191         struct target_fabric_configfs *tf;
 192         int ret;
 193
 194         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 195                         " %s\n", group, name);
 196
 197         tf = target_core_get_fabric(name);
 198         if (!tf) {
 199                 pr_debug("target_core_register_fabric() trying autoload for %s\n",
 200                          name);
 201
 202                 /*
 203                  * Below are some hardcoded request_module() calls to automatically
 204                  * local fabric modules when the following is called:
 205                  *
 206                  * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 207                  *
 208                  * Note that this does not limit which TCM fabric module can be
 209                  * registered, but simply provids auto loading logic for modules with
 210                  * mkdir(2) system calls with known TCM fabric modules.
 211                  */
 212
 213                 if (!strncmp(name, "iscsi", 5)) {
 214                         /*
 215                          * Automatically load the LIO Target fabric module when the
 216                          * following is called:
 217                          *
 218                          * mkdir -p $CONFIGFS/target/iscsi
 219                          */
 220                         ret = request_module("iscsi_target_mod");
 221                         if (ret < 0) {
 222                                 pr_debug("request_module() failed for"
 223                                          " iscsi_target_mod.ko: %d\n", ret);
 224                                 return ERR_PTR(-EINVAL);
 225                         }
 226                 } else if (!strncmp(name, "loopback", 8)) {
 227                         /*
 228                          * Automatically load the tcm_loop fabric module when the
 229                          * following is called:
 230                          *
 231                          * mkdir -p $CONFIGFS/target/loopback
 232                          */
 233                         ret = request_module("tcm_loop");
 234                         if (ret < 0) {
 235                                 pr_debug("request_module() failed for"
 236                                          " tcm_loop.ko: %d\n", ret);
 237                                 return ERR_PTR(-EINVAL);
 238                         }
 239                 }
 240
 241                 tf = target_core_get_fabric(name);
 242         }
 243
 244         if (!tf) {
 245                 pr_debug("target_core_get_fabric() failed for %s\n",
 246                          name);
 247                 return ERR_PTR(-EINVAL);
 248         }
 249         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 250                         " %s\n", tf->tf_ops->name);
 251         /*
 252          * On a successful target_core_get_fabric() look, the returned
 253          * struct target_fabric_configfs *tf will contain a usage reference.
 254          */
 255         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 256                         &tf->tf_wwn_cit);
 257
 258         config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
 259
 260         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 261                         &tf->tf_discovery_cit);
 262         configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
 263
 264         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 265                         " %s\n", tf->tf_group.cg_item.ci_name);
 266         return &tf->tf_group;
 267 }
 268
 269 /*
 270  * Called from struct target_core_group_ops->drop_item()
 271  */
 272 static void target_core_deregister_fabric(
 273         struct config_group *group,
 274         struct config_item *item)
 275 {
 276         struct target_fabric_configfs *tf = container_of(
 277                 to_config_group(item), struct target_fabric_configfs, tf_group);
 278
 279         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 280                 " tf list\n", config_item_name(item));
 281
 282         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 283                         " %s\n", tf->tf_ops->name);
 284         atomic_dec(&tf->tf_access_cnt);
 285
 286         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 287                         " %s\n", config_item_name(item));
 288
 289         configfs_remove_default_groups(&tf->tf_group);
 290         config_item_put(item);
 291 }
 292
 293 static struct configfs_group_operations target_core_fabric_group_ops = {
 294         .make_group     = &target_core_register_fabric,
 295         .drop_item      = &target_core_deregister_fabric,
 296 };
 297
 298 /*
 299  * All item attributes appearing in /sys/kernel/target/ appear here.
 300  */
 301 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 302         &target_core_item_attr_version,
 303         &target_core_item_attr_dbroot,
 304         NULL,
 305 };
 306
 307 /*
 308  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 309  */
 310 static const struct config_item_type target_core_fabrics_item = {
 311         .ct_group_ops   = &target_core_fabric_group_ops,
 312         .ct_attrs       = target_core_fabric_item_attrs,
 313         .ct_owner       = THIS_MODULE,
 314 };
 315
 316 static struct configfs_subsystem target_core_fabrics = {
 317         .su_group = {
 318                 .cg_item = {
 319                         .ci_namebuf = "target",
 320                         .ci_type = &target_core_fabrics_item,
 321                 },
 322         },
 323 };
 324
 325 int target_depend_item(struct config_item *item)
 326 {
 327         return configfs_depend_item(&target_core_fabrics, item);
 328 }
 329 EXPORT_SYMBOL(target_depend_item);
 330
 331 void target_undepend_item(struct config_item *item)
 332 {
 333         return configfs_undepend_item(item);
 334 }
 335 EXPORT_SYMBOL(target_undepend_item);
 336
 337 /*##############################################################################
 338 // Start functions called by external Target Fabrics Modules
 339 //############################################################################*/
 340
 341 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 342 {
 343         if (!tfo->name) {
 344                 pr_err("Missing tfo->name\n");
 345                 return -EINVAL;
 346         }
 347         if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
 348                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
 349                         "_NAME_SIZE\n", tfo->name);
 350                 return -EINVAL;
 351         }
 352         if (!tfo->get_fabric_name) {
 353                 pr_err("Missing tfo->get_fabric_name()\n");
 354                 return -EINVAL;
 355         }
 356         if (!tfo->tpg_get_wwn) {
 357                 pr_err("Missing tfo->tpg_get_wwn()\n");
 358                 return -EINVAL;
 359         }
 360         if (!tfo->tpg_get_tag) {
 361                 pr_err("Missing tfo->tpg_get_tag()\n");
 362                 return -EINVAL;
 363         }
 364         if (!tfo->tpg_check_demo_mode) {
 365                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
 366                 return -EINVAL;
 367         }
 368         if (!tfo->tpg_check_demo_mode_cache) {
 369                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 370                 return -EINVAL;
 371         }
 372         if (!tfo->tpg_check_demo_mode_write_protect) {
 373                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 374                 return -EINVAL;
 375         }
 376         if (!tfo->tpg_check_prod_mode_write_protect) {
 377                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 378                 return -EINVAL;
 379         }
 380         if (!tfo->tpg_get_inst_index) {
 381                 pr_err("Missing tfo->tpg_get_inst_index()\n");
 382                 return -EINVAL;
 383         }
 384         if (!tfo->release_cmd) {
 385                 pr_err("Missing tfo->release_cmd()\n");
 386                 return -EINVAL;
 387         }
 388         if (!tfo->sess_get_index) {
 389                 pr_err("Missing tfo->sess_get_index()\n");
 390                 return -EINVAL;
 391         }
 392         if (!tfo->write_pending) {
 393                 pr_err("Missing tfo->write_pending()\n");
 394                 return -EINVAL;
 395         }
 396         if (!tfo->write_pending_status) {
 397                 pr_err("Missing tfo->write_pending_status()\n");
 398                 return -EINVAL;
 399         }
 400         if (!tfo->set_default_node_attributes) {
 401                 pr_err("Missing tfo->set_default_node_attributes()\n");
 402                 return -EINVAL;
 403         }
 404         if (!tfo->get_cmd_state) {
 405                 pr_err("Missing tfo->get_cmd_state()\n");
 406                 return -EINVAL;
 407         }
 408         if (!tfo->queue_data_in) {
 409                 pr_err("Missing tfo->queue_data_in()\n");
 410                 return -EINVAL;
 411         }
 412         if (!tfo->queue_status) {
 413                 pr_err("Missing tfo->queue_status()\n");
 414                 return -EINVAL;
 415         }
 416         if (!tfo->queue_tm_rsp) {
 417                 pr_err("Missing tfo->queue_tm_rsp()\n");
 418                 return -EINVAL;
 419         }
 420         if (!tfo->aborted_task) {
 421                 pr_err("Missing tfo->aborted_task()\n");
 422                 return -EINVAL;
 423         }
 424         if (!tfo->check_stop_free) {
 425                 pr_err("Missing tfo->check_stop_free()\n");
 426                 return -EINVAL;
 427         }
 428         /*
 429          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 430          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 431          * target_core_fabric_configfs.c WWN+TPG group context code.
 432          */
 433         if (!tfo->fabric_make_wwn) {
 434                 pr_err("Missing tfo->fabric_make_wwn()\n");
 435                 return -EINVAL;
 436         }
 437         if (!tfo->fabric_drop_wwn) {
 438                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 439                 return -EINVAL;
 440         }
 441         if (!tfo->fabric_make_tpg) {
 442                 pr_err("Missing tfo->fabric_make_tpg()\n");
 443                 return -EINVAL;
 444         }
 445         if (!tfo->fabric_drop_tpg) {
 446                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 int target_register_template(const struct target_core_fabric_ops *fo)
 454 {
 455         struct target_fabric_configfs *tf;
 456         int ret;
 457
 458         ret = target_fabric_tf_ops_check(fo);
 459         if (ret)
 460                 return ret;
 461
 462         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 463         if (!tf) {
 464                 pr_err("%s: could not allocate memory!\n", __func__);
 465                 return -ENOMEM;
 466         }
 467
 468         INIT_LIST_HEAD(&tf->tf_list);
 469         atomic_set(&tf->tf_access_cnt, 0);
 470         tf->tf_ops = fo;
 471         target_fabric_setup_cits(tf);
 472
 473         mutex_lock(&g_tf_lock);
 474         list_add_tail(&tf->tf_list, &g_tf_list);
 475         mutex_unlock(&g_tf_lock);
 476
 477         return 0;
 478 }
 479 EXPORT_SYMBOL(target_register_template);
 480
 481 void target_unregister_template(const struct target_core_fabric_ops *fo)
 482 {
 483         struct target_fabric_configfs *t;
 484
 485         mutex_lock(&g_tf_lock);
 486         list_for_each_entry(t, &g_tf_list, tf_list) {
 487                 if (!strcmp(t->tf_ops->name, fo->name)) {
 488                         BUG_ON(atomic_read(&t->tf_access_cnt));
 489                         list_del(&t->tf_list);
 490                         mutex_unlock(&g_tf_lock);
 491                         /*
 492                          * Wait for any outstanding fabric se_deve_entry->rcu_head
 493                          * callbacks to complete post kfree_rcu(), before allowing
 494                          * fabric driver unload of TFO->module to proceed.
 495                          */
 496                         rcu_barrier();
 497                         kfree(t);
 498                         return;
 499                 }
 500         }
 501         mutex_unlock(&g_tf_lock);
 502 }
 503 EXPORT_SYMBOL(target_unregister_template);
 504
 505 /*##############################################################################
 506 // Stop functions called by external Target Fabrics Modules
 507 //############################################################################*/
 508
 509 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
 510 {
 511         return container_of(to_config_group(item), struct se_dev_attrib,
 512                         da_group);
 513 }
 514
 515 /* Start functions for struct config_item_type tb_dev_attrib_cit */
 516 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
 517 static ssize_t _name##_show(struct config_item *item, char *page)       \
 518 {                                                                       \
 519         return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
 520 }
 521
 522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
 523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
 524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
 525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
 526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
 527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
 528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
 529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
 530 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
 531 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
 532 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
 533 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
 534 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
 535 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_format);
 536 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
 537 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
 538 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
 539 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
 540 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
 541 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
 542 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
 543 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
 544 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
 545 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
 546 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
 547 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
 548 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
 549 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
 550 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
 551 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
 552 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
 553
 554 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
 555 static ssize_t _name##_store(struct config_item *item, const char *page,\
 556                 size_t count)                                           \
 557 {                                                                       \
 558         struct se_dev_attrib *da = to_attrib(item);                     \
 559         u32 val;                                                        \
 560         int ret;                                                        \
 561                                                                         \
 562         ret = kstrtou32(page, 0, &val);                                 \
 563         if (ret < 0)                                                    \
 564                 return ret;                                             \
 565         da->_name = val;                                                \
 566         return count;                                                   \
 567 }
 568
 569 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
 570 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
 571 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
 572 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
 573 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
 574
 575 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
 576 static ssize_t _name##_store(struct config_item *item, const char *page,        \
 577                 size_t count)                                           \
 578 {                                                                       \
 579         struct se_dev_attrib *da = to_attrib(item);                     \
 580         bool flag;                                                      \
 581         int ret;                                                        \
 582                                                                         \
 583         ret = strtobool(page, &flag);                                   \
 584         if (ret < 0)                                                    \
 585                 return ret;                                             \
 586         da->_name = flag;                                               \
 587         return count;                                                   \
 588 }
 589
 590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
 591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
 592 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
 593 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
 594 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
 595
 596 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
 597 static ssize_t _name##_store(struct config_item *item, const char *page,\
 598                 size_t count)                                           \
 599 {                                                                       \
 600         printk_once(KERN_WARNING                                        \
 601                 "ignoring deprecated %s attribute\n",                   \
 602                 __stringify(_name));                                    \
 603         return count;                                                   \
 604 }
 605
 606 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
 607 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
 608
 609 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 610 {
 611         const char *configname;
 612
 613         configname = config_item_name(&dev->dev_group.cg_item);
 614         if (strlen(configname) >= 16) {
 615                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 616                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 617                         configname);
 618         }
 619         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 620 }
 621
 622 static ssize_t emulate_model_alias_store(struct config_item *item,
 623                 const char *page, size_t count)
 624 {
 625         struct se_dev_attrib *da = to_attrib(item);
 626         struct se_device *dev = da->da_dev;
 627         bool flag;
 628         int ret;
 629
 630         if (dev->export_count) {
 631                 pr_err("dev[%p]: Unable to change model alias"
 632                         " while export_count is %d\n",
 633                         dev, dev->export_count);
 634                 return -EINVAL;
 635         }
 636
 637         ret = strtobool(page, &flag);
 638         if (ret < 0)
 639                 return ret;
 640
 641         if (flag) {
 642                 dev_set_t10_wwn_model_alias(dev);
 643         } else {
 644                 strncpy(&dev->t10_wwn.model[0],
 645                         dev->transport->inquiry_prod, 16);
 646         }
 647         da->emulate_model_alias = flag;
 648         return count;
 649 }
 650
 651 static ssize_t emulate_write_cache_store(struct config_item *item,
 652                 const char *page, size_t count)
 653 {
 654         struct se_dev_attrib *da = to_attrib(item);
 655         bool flag;
 656         int ret;
 657
 658         ret = strtobool(page, &flag);
 659         if (ret < 0)
 660                 return ret;
 661
 662         if (flag && da->da_dev->transport->get_write_cache) {
 663                 pr_err("emulate_write_cache not supported for this device\n");
 664                 return -EINVAL;
 665         }
 666
 667         da->emulate_write_cache = flag;
 668         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 669                         da->da_dev, flag);
 670         return count;
 671 }
 672
 673 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
 674                 const char *page, size_t count)
 675 {
 676         struct se_dev_attrib *da = to_attrib(item);
 677         u32 val;
 678         int ret;
 679
 680         ret = kstrtou32(page, 0, &val);
 681         if (ret < 0)
 682                 return ret;
 683
 684         if (val != 0 && val != 1 && val != 2) {
 685                 pr_err("Illegal value %d\n", val);
 686                 return -EINVAL;
 687         }
 688
 689         if (da->da_dev->export_count) {
 690                 pr_err("dev[%p]: Unable to change SE Device"
 691                         " UA_INTRLCK_CTRL while export_count is %d\n",
 692                         da->da_dev, da->da_dev->export_count);
 693                 return -EINVAL;
 694         }
 695         da->emulate_ua_intlck_ctrl = val;
 696         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 697                 da->da_dev, val);
 698         return count;
 699 }
 700
 701 static ssize_t emulate_tas_store(struct config_item *item,
 702                 const char *page, size_t count)
 703 {
 704         struct se_dev_attrib *da = to_attrib(item);
 705         bool flag;
 706         int ret;
 707
 708         ret = strtobool(page, &flag);
 709         if (ret < 0)
 710                 return ret;
 711
 712         if (da->da_dev->export_count) {
 713                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 714                         " export_count is %d\n",
 715                         da->da_dev, da->da_dev->export_count);
 716                 return -EINVAL;
 717         }
 718         da->emulate_tas = flag;
 719         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 720                 da->da_dev, flag ? "Enabled" : "Disabled");
 721
 722         return count;
 723 }
 724
 725 static ssize_t emulate_tpu_store(struct config_item *item,
 726                 const char *page, size_t count)
 727 {
 728         struct se_dev_attrib *da = to_attrib(item);
 729         bool flag;
 730         int ret;
 731
 732         ret = strtobool(page, &flag);
 733         if (ret < 0)
 734                 return ret;
 735
 736         /*
 737          * We expect this value to be non-zero when generic Block Layer
 738          * Discard supported is detected iblock_create_virtdevice().
 739          */
 740         if (flag && !da->max_unmap_block_desc_count) {
 741                 pr_err("Generic Block Discard not supported\n");
 742                 return -ENOSYS;
 743         }
 744
 745         da->emulate_tpu = flag;
 746         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 747                 da->da_dev, flag);
 748         return count;
 749 }
 750
 751 static ssize_t emulate_tpws_store(struct config_item *item,
 752                 const char *page, size_t count)
 753 {
 754         struct se_dev_attrib *da = to_attrib(item);
 755         bool flag;
 756         int ret;
 757
 758         ret = strtobool(page, &flag);
 759         if (ret < 0)
 760                 return ret;
 761
 762         /*
 763          * We expect this value to be non-zero when generic Block Layer
 764          * Discard supported is detected iblock_create_virtdevice().
 765          */
 766         if (flag && !da->max_unmap_block_desc_count) {
 767                 pr_err("Generic Block Discard not supported\n");
 768                 return -ENOSYS;
 769         }
 770
 771         da->emulate_tpws = flag;
 772         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 773                                 da->da_dev, flag);
 774         return count;
 775 }
 776
 777 static ssize_t pi_prot_type_store(struct config_item *item,
 778                 const char *page, size_t count)
 779 {
 780         struct se_dev_attrib *da = to_attrib(item);
 781         int old_prot = da->pi_prot_type, ret;
 782         struct se_device *dev = da->da_dev;
 783         u32 flag;
 784
 785         ret = kstrtou32(page, 0, &flag);
 786         if (ret < 0)
 787                 return ret;
 788
 789         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 790                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 791                 return -EINVAL;
 792         }
 793         if (flag == 2) {
 794                 pr_err("DIF TYPE2 protection currently not supported\n");
 795                 return -ENOSYS;
 796         }
 797         if (da->hw_pi_prot_type) {
 798                 pr_warn("DIF protection enabled on underlying hardware,"
 799                         " ignoring\n");
 800                 return count;
 801         }
 802         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 803                 /* 0 is only allowed value for non-supporting backends */
 804                 if (flag == 0)
 805                         return count;
 806
 807                 pr_err("DIF protection not supported by backend: %s\n",
 808                        dev->transport->name);
 809                 return -ENOSYS;
 810         }
 811         if (!(dev->dev_flags & DF_CONFIGURED)) {
 812                 pr_err("DIF protection requires device to be configured\n");
 813                 return -ENODEV;
 814         }
 815         if (dev->export_count) {
 816                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 817                        " export_count is %d\n", dev, dev->export_count);
 818                 return -EINVAL;
 819         }
 820
 821         da->pi_prot_type = flag;
 822
 823         if (flag && !old_prot) {
 824                 ret = dev->transport->init_prot(dev);
 825                 if (ret) {
 826                         da->pi_prot_type = old_prot;
 827                         da->pi_prot_verify = (bool) da->pi_prot_type;
 828                         return ret;
 829                 }
 830
 831         } else if (!flag && old_prot) {
 832                 dev->transport->free_prot(dev);
 833         }
 834
 835         da->pi_prot_verify = (bool) da->pi_prot_type;
 836         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 837         return count;
 838 }
 839
 840 static ssize_t pi_prot_format_store(struct config_item *item,
 841                 const char *page, size_t count)
 842 {
 843         struct se_dev_attrib *da = to_attrib(item);
 844         struct se_device *dev = da->da_dev;
 845         bool flag;
 846         int ret;
 847
 848         ret = strtobool(page, &flag);
 849         if (ret < 0)
 850                 return ret;
 851
 852         if (!flag)
 853                 return count;
 854
 855         if (!dev->transport->format_prot) {
 856                 pr_err("DIF protection format not supported by backend %s\n",
 857                        dev->transport->name);
 858                 return -ENOSYS;
 859         }
 860         if (!(dev->dev_flags & DF_CONFIGURED)) {
 861                 pr_err("DIF protection format requires device to be configured\n");
 862                 return -ENODEV;
 863         }
 864         if (dev->export_count) {
 865                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 866                        " export_count is %d\n", dev, dev->export_count);
 867                 return -EINVAL;
 868         }
 869
 870         ret = dev->transport->format_prot(dev);
 871         if (ret)
 872                 return ret;
 873
 874         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
 875         return count;
 876 }
 877
 878 static ssize_t pi_prot_verify_store(struct config_item *item,
 879                 const char *page, size_t count)
 880 {
 881         struct se_dev_attrib *da = to_attrib(item);
 882         bool flag;
 883         int ret;
 884
 885         ret = strtobool(page, &flag);
 886         if (ret < 0)
 887                 return ret;
 888
 889         if (!flag) {
 890                 da->pi_prot_verify = flag;
 891                 return count;
 892         }
 893         if (da->hw_pi_prot_type) {
 894                 pr_warn("DIF protection enabled on underlying hardware,"
 895                         " ignoring\n");
 896                 return count;
 897         }
 898         if (!da->pi_prot_type) {
 899                 pr_warn("DIF protection not supported by backend, ignoring\n");
 900                 return count;
 901         }
 902         da->pi_prot_verify = flag;
 903
 904         return count;
 905 }
 906
 907 static ssize_t force_pr_aptpl_store(struct config_item *item,
 908                 const char *page, size_t count)
 909 {
 910         struct se_dev_attrib *da = to_attrib(item);
 911         bool flag;
 912         int ret;
 913
 914         ret = strtobool(page, &flag);
 915         if (ret < 0)
 916                 return ret;
 917         if (da->da_dev->export_count) {
 918                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
 919                        " export_count is %d\n",
 920                        da->da_dev, da->da_dev->export_count);
 921                 return -EINVAL;
 922         }
 923
 924         da->force_pr_aptpl = flag;
 925         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
 926         return count;
 927 }
 928
 929 static ssize_t emulate_rest_reord_store(struct config_item *item,
 930                 const char *page, size_t count)
 931 {
 932         struct se_dev_attrib *da = to_attrib(item);
 933         bool flag;
 934         int ret;
 935
 936         ret = strtobool(page, &flag);
 937         if (ret < 0)
 938                 return ret;
 939
 940         if (flag != 0) {
 941                 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
 942                         " reordering not implemented\n", da->da_dev);
 943                 return -ENOSYS;
 944         }
 945         da->emulate_rest_reord = flag;
 946         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
 947                 da->da_dev, flag);
 948         return count;
 949 }
 950
 951 static ssize_t unmap_zeroes_data_store(struct config_item *item,
 952                 const char *page, size_t count)
 953 {
 954         struct se_dev_attrib *da = to_attrib(item);
 955         bool flag;
 956         int ret;
 957
 958         ret = strtobool(page, &flag);
 959         if (ret < 0)
 960                 return ret;
 961
 962         if (da->da_dev->export_count) {
 963                 pr_err("dev[%p]: Unable to change SE Device"
 964                        " unmap_zeroes_data while export_count is %d\n",
 965                        da->da_dev, da->da_dev->export_count);
 966                 return -EINVAL;
 967         }
 968         /*
 969          * We expect this value to be non-zero when generic Block Layer
 970          * Discard supported is detected iblock_configure_device().
 971          */
 972         if (flag && !da->max_unmap_block_desc_count) {
 973                 pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
 974                        " because max_unmap_block_desc_count is zero\n",
 975                        da->da_dev);
 976                 return -ENOSYS;
 977         }
 978         da->unmap_zeroes_data = flag;
 979         pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
 980                  da->da_dev, flag);
 981         return count;
 982 }
 983
 984 /*
 985  * Note, this can only be called on unexported SE Device Object.
 986  */
 987 static ssize_t queue_depth_store(struct config_item *item,
 988                 const char *page, size_t count)
 989 {
 990         struct se_dev_attrib *da = to_attrib(item);
 991         struct se_device *dev = da->da_dev;
 992         u32 val;
 993         int ret;
 994
 995         ret = kstrtou32(page, 0, &val);
 996         if (ret < 0)
 997                 return ret;
 998
 999         if (dev->export_count) {
1000                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1001                         " export_count is %d\n",
1002                         dev, dev->export_count);
1003                 return -EINVAL;
1004         }
1005         if (!val) {
1006                 pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1007                 return -EINVAL;
1008         }
1009
1010         if (val > dev->dev_attrib.queue_depth) {
1011                 if (val > dev->dev_attrib.hw_queue_depth) {
1012                         pr_err("dev[%p]: Passed queue_depth:"
1013                                 " %u exceeds TCM/SE_Device MAX"
1014                                 " TCQ: %u\n", dev, val,
1015                                 dev->dev_attrib.hw_queue_depth);
1016                         return -EINVAL;
1017                 }
1018         }
1019         da->queue_depth = dev->queue_depth = val;
1020         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1021         return count;
1022 }
1023
1024 static ssize_t optimal_sectors_store(struct config_item *item,
1025                 const char *page, size_t count)
1026 {
1027         struct se_dev_attrib *da = to_attrib(item);
1028         u32 val;
1029         int ret;
1030
1031         ret = kstrtou32(page, 0, &val);
1032         if (ret < 0)
1033                 return ret;
1034
1035         if (da->da_dev->export_count) {
1036                 pr_err("dev[%p]: Unable to change SE Device"
1037                         " optimal_sectors while export_count is %d\n",
1038                         da->da_dev, da->da_dev->export_count);
1039                 return -EINVAL;
1040         }
1041         if (val > da->hw_max_sectors) {
1042                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1043                         " greater than hw_max_sectors: %u\n",
1044                         da->da_dev, val, da->hw_max_sectors);
1045                 return -EINVAL;
1046         }
1047
1048         da->optimal_sectors = val;
1049         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1050                         da->da_dev, val);
1051         return count;
1052 }
1053
1054 static ssize_t block_size_store(struct config_item *item,
1055                 const char *page, size_t count)
1056 {
1057         struct se_dev_attrib *da = to_attrib(item);
1058         u32 val;
1059         int ret;
1060
1061         ret = kstrtou32(page, 0, &val);
1062         if (ret < 0)
1063                 return ret;
1064
1065         if (da->da_dev->export_count) {
1066                 pr_err("dev[%p]: Unable to change SE Device block_size"
1067                         " while export_count is %d\n",
1068                         da->da_dev, da->da_dev->export_count);
1069                 return -EINVAL;
1070         }
1071
1072         if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1073                 pr_err("dev[%p]: Illegal value for block_device: %u"
1074                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1075                         da->da_dev, val);
1076                 return -EINVAL;
1077         }
1078
1079         da->block_size = val;
1080         if (da->max_bytes_per_io)
1081                 da->hw_max_sectors = da->max_bytes_per_io / val;
1082
1083         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1084                         da->da_dev, val);
1085         return count;
1086 }
1087
1088 static ssize_t alua_support_show(struct config_item *item, char *page)
1089 {
1090         struct se_dev_attrib *da = to_attrib(item);
1091         u8 flags = da->da_dev->transport->transport_flags;
1092
1093         return snprintf(page, PAGE_SIZE, "%d\n",
1094                         flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1095 }
1096
1097 static ssize_t pgr_support_show(struct config_item *item, char *page)
1098 {
1099         struct se_dev_attrib *da = to_attrib(item);
1100         u8 flags = da->da_dev->transport->transport_flags;
1101
1102         return snprintf(page, PAGE_SIZE, "%d\n",
1103                         flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1104 }
1105
1106 CONFIGFS_ATTR(, emulate_model_alias);
1107 CONFIGFS_ATTR(, emulate_dpo);
1108 CONFIGFS_ATTR(, emulate_fua_write);
1109 CONFIGFS_ATTR(, emulate_fua_read);
1110 CONFIGFS_ATTR(, emulate_write_cache);
1111 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1112 CONFIGFS_ATTR(, emulate_tas);
1113 CONFIGFS_ATTR(, emulate_tpu);
1114 CONFIGFS_ATTR(, emulate_tpws);
1115 CONFIGFS_ATTR(, emulate_caw);
1116 CONFIGFS_ATTR(, emulate_3pc);
1117 CONFIGFS_ATTR(, pi_prot_type);
1118 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1119 CONFIGFS_ATTR(, pi_prot_format);
1120 CONFIGFS_ATTR(, pi_prot_verify);
1121 CONFIGFS_ATTR(, enforce_pr_isids);
1122 CONFIGFS_ATTR(, is_nonrot);
1123 CONFIGFS_ATTR(, emulate_rest_reord);
1124 CONFIGFS_ATTR(, force_pr_aptpl);
1125 CONFIGFS_ATTR_RO(, hw_block_size);
1126 CONFIGFS_ATTR(, block_size);
1127 CONFIGFS_ATTR_RO(, hw_max_sectors);
1128 CONFIGFS_ATTR(, optimal_sectors);
1129 CONFIGFS_ATTR_RO(, hw_queue_depth);
1130 CONFIGFS_ATTR(, queue_depth);
1131 CONFIGFS_ATTR(, max_unmap_lba_count);
1132 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1133 CONFIGFS_ATTR(, unmap_granularity);
1134 CONFIGFS_ATTR(, unmap_granularity_alignment);
1135 CONFIGFS_ATTR(, unmap_zeroes_data);
1136 CONFIGFS_ATTR(, max_write_same_len);
1137 CONFIGFS_ATTR_RO(, alua_support);
1138 CONFIGFS_ATTR_RO(, pgr_support);
1139
1140 /*
1141  * dev_attrib attributes for devices using the target core SBC/SPC
1142  * interpreter.  Any backend using spc_parse_cdb should be using
1143  * these.
1144  */
1145 struct configfs_attribute *sbc_attrib_attrs[] = {
1146         &attr_emulate_model_alias,
1147         &attr_emulate_dpo,
1148         &attr_emulate_fua_write,
1149         &attr_emulate_fua_read,
1150         &attr_emulate_write_cache,
1151         &attr_emulate_ua_intlck_ctrl,
1152         &attr_emulate_tas,
1153         &attr_emulate_tpu,
1154         &attr_emulate_tpws,
1155         &attr_emulate_caw,
1156         &attr_emulate_3pc,
1157         &attr_pi_prot_type,
1158         &attr_hw_pi_prot_type,
1159         &attr_pi_prot_format,
1160         &attr_pi_prot_verify,
1161         &attr_enforce_pr_isids,
1162         &attr_is_nonrot,
1163         &attr_emulate_rest_reord,
1164         &attr_force_pr_aptpl,
1165         &attr_hw_block_size,
1166         &attr_block_size,
1167         &attr_hw_max_sectors,
1168         &attr_optimal_sectors,
1169         &attr_hw_queue_depth,
1170         &attr_queue_depth,
1171         &attr_max_unmap_lba_count,
1172         &attr_max_unmap_block_desc_count,
1173         &attr_unmap_granularity,
1174         &attr_unmap_granularity_alignment,
1175         &attr_unmap_zeroes_data,
1176         &attr_max_write_same_len,
1177         &attr_alua_support,
1178         &attr_pgr_support,
1179         NULL,
1180 };
1181 EXPORT_SYMBOL(sbc_attrib_attrs);
1182
1183 /*
1184  * Minimal dev_attrib attributes for devices passing through CDBs.
1185  * In this case we only provide a few read-only attributes for
1186  * backwards compatibility.
1187  */
1188 struct configfs_attribute *passthrough_attrib_attrs[] = {
1189         &attr_hw_pi_prot_type,
1190         &attr_hw_block_size,
1191         &attr_hw_max_sectors,
1192         &attr_hw_queue_depth,
1193         &attr_alua_support,
1194         &attr_pgr_support,
1195         NULL,
1196 };
1197 EXPORT_SYMBOL(passthrough_attrib_attrs);
1198
1199 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1200 TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
1201
1202 /* End functions for struct config_item_type tb_dev_attrib_cit */
1203
1204 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1205
1206 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1207 {
1208         return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1209 }
1210
1211 /*
1212  * VPD page 0x80 Unit serial
1213  */
1214 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1215                 char *page)
1216 {
1217         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1218                 &to_t10_wwn(item)->unit_serial[0]);
1219 }
1220
1221 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1222                 const char *page, size_t count)
1223 {
1224         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1225         struct se_device *dev = t10_wwn->t10_dev;
1226         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
1227
1228         /*
1229          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1230          * from the struct scsi_device level firmware, do not allow
1231          * VPD Unit Serial to be emulated.
1232          *
1233          * Note this struct scsi_device could also be emulating VPD
1234          * information from its drivers/scsi LLD.  But for now we assume
1235          * it is doing 'the right thing' wrt a world wide unique
1236          * VPD Unit Serial Number that OS dependent multipath can depend on.
1237          */
1238         if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1239                 pr_err("Underlying SCSI device firmware provided VPD"
1240                         " Unit Serial, ignoring request\n");
1241                 return -EOPNOTSUPP;
1242         }
1243
1244         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1245                 pr_err("Emulated VPD Unit Serial exceeds"
1246                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1247                 return -EOVERFLOW;
1248         }
1249         /*
1250          * Check to see if any active $FABRIC_MOD exports exist.  If they
1251          * do exist, fail here as changing this information on the fly
1252          * (underneath the initiator side OS dependent multipath code)
1253          * could cause negative effects.
1254          */
1255         if (dev->export_count) {
1256                 pr_err("Unable to set VPD Unit Serial while"
1257                         " active %d $FABRIC_MOD exports exist\n",
1258                         dev->export_count);
1259                 return -EINVAL;
1260         }
1261
1262         /*
1263          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1264          *
1265          * Also, strip any newline added from the userspace
1266          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1267          */
1268         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
1269         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1270         snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1271                         "%s", strstrip(buf));
1272         dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1273
1274         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1275                         " %s\n", dev->t10_wwn.unit_serial);
1276
1277         return count;
1278 }
1279
1280 /*
1281  * VPD page 0x83 Protocol Identifier
1282  */
1283 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1284                 char *page)
1285 {
1286         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1287         struct t10_vpd *vpd;
1288         unsigned char buf[VPD_TMP_BUF_SIZE];
1289         ssize_t len = 0;
1290
1291         memset(buf, 0, VPD_TMP_BUF_SIZE);
1292
1293         spin_lock(&t10_wwn->t10_vpd_lock);
1294         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1295                 if (!vpd->protocol_identifier_set)
1296                         continue;
1297
1298                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1299
1300                 if (len + strlen(buf) >= PAGE_SIZE)
1301                         break;
1302
1303                 len += sprintf(page+len, "%s", buf);
1304         }
1305         spin_unlock(&t10_wwn->t10_vpd_lock);
1306
1307         return len;
1308 }
1309
1310 /*
1311  * Generic wrapper for dumping VPD identifiers by association.
1312  */
1313 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
1314 static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
1315                 char *page)                                             \
1316 {                                                                       \
1317         struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
1318         struct t10_vpd *vpd;                                            \
1319         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
1320         ssize_t len = 0;                                                \
1321                                                                         \
1322         spin_lock(&t10_wwn->t10_vpd_lock);                              \
1323         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
1324                 if (vpd->association != _assoc)                         \
1325                         continue;                                       \
1326                                                                         \
1327                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1328                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
1329                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1330                         break;                                          \
1331                 len += sprintf(page+len, "%s", buf);                    \
1332                                                                         \
1333                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1334                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1335                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1336                         break;                                          \
1337                 len += sprintf(page+len, "%s", buf);                    \
1338                                                                         \
1339                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1340                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1341                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1342                         break;                                          \
1343                 len += sprintf(page+len, "%s", buf);                    \
1344         }                                                               \
1345         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
1346                                                                         \
1347         return len;                                                     \
1348 }
1349
1350 /* VPD page 0x83 Association: Logical Unit */
1351 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1352 /* VPD page 0x83 Association: Target Port */
1353 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1354 /* VPD page 0x83 Association: SCSI Target Device */
1355 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1356
1357 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1358 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1359 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1360 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1361 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1362
1363 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1364         &target_wwn_attr_vpd_unit_serial,
1365         &target_wwn_attr_vpd_protocol_identifier,
1366         &target_wwn_attr_vpd_assoc_logical_unit,
1367         &target_wwn_attr_vpd_assoc_target_port,
1368         &target_wwn_attr_vpd_assoc_scsi_target_device,
1369         NULL,
1370 };
1371
1372 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1373
1374 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1375
1376 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1377
1378 static struct se_device *pr_to_dev(struct config_item *item)
1379 {
1380         return container_of(to_config_group(item), struct se_device,
1381                         dev_pr_group);
1382 }
1383
1384 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1385                 char *page)
1386 {
1387         struct se_node_acl *se_nacl;
1388         struct t10_pr_registration *pr_reg;
1389         char i_buf[PR_REG_ISID_ID_LEN];
1390
1391         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1392
1393         pr_reg = dev->dev_pr_res_holder;
1394         if (!pr_reg)
1395                 return sprintf(page, "No SPC-3 Reservation holder\n");
1396
1397         se_nacl = pr_reg->pr_reg_nacl;
1398         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1399
1400         return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1401                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1402                 se_nacl->initiatorname, i_buf);
1403 }
1404
1405 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1406                 char *page)
1407 {
1408         struct se_node_acl *se_nacl;
1409         ssize_t len;
1410
1411         se_nacl = dev->dev_reserved_node_acl;
1412         if (se_nacl) {
1413                 len = sprintf(page,
1414                               "SPC-2 Reservation: %s Initiator: %s\n",
1415                               se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1416                               se_nacl->initiatorname);
1417         } else {
1418                 len = sprintf(page, "No SPC-2 Reservation holder\n");
1419         }
1420         return len;
1421 }
1422
1423 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1424 {
1425         struct se_device *dev = pr_to_dev(item);
1426         int ret;
1427
1428         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1429                 return sprintf(page, "Passthrough\n");
1430
1431         spin_lock(&dev->dev_reservation_lock);
1432         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1433                 ret = target_core_dev_pr_show_spc2_res(dev, page);
1434         else
1435                 ret = target_core_dev_pr_show_spc3_res(dev, page);
1436         spin_unlock(&dev->dev_reservation_lock);
1437         return ret;
1438 }
1439
1440 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1441                 char *page)
1442 {
1443         struct se_device *dev = pr_to_dev(item);
1444         ssize_t len = 0;
1445
1446         spin_lock(&dev->dev_reservation_lock);
1447         if (!dev->dev_pr_res_holder) {
1448                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1449         } else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1450                 len = sprintf(page, "SPC-3 Reservation: All Target"
1451                         " Ports registration\n");
1452         } else {
1453                 len = sprintf(page, "SPC-3 Reservation: Single"
1454                         " Target Port registration\n");
1455         }
1456
1457         spin_unlock(&dev->dev_reservation_lock);
1458         return len;
1459 }
1460
1461 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1462                 char *page)
1463 {
1464         return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1465 }
1466
1467
1468 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1469                 char *page)
1470 {
1471         struct se_device *dev = pr_to_dev(item);
1472         struct se_node_acl *se_nacl;
1473         struct se_portal_group *se_tpg;
1474         struct t10_pr_registration *pr_reg;
1475         const struct target_core_fabric_ops *tfo;
1476         ssize_t len = 0;
1477
1478         spin_lock(&dev->dev_reservation_lock);
1479         pr_reg = dev->dev_pr_res_holder;
1480         if (!pr_reg) {
1481                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1482                 goto out_unlock;
1483         }
1484
1485         se_nacl = pr_reg->pr_reg_nacl;
1486         se_tpg = se_nacl->se_tpg;
1487         tfo = se_tpg->se_tpg_tfo;
1488
1489         len += sprintf(page+len, "SPC-3 Reservation: %s"
1490                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1491                 tfo->tpg_get_wwn(se_tpg));
1492         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1493                 " Identifier Tag: %hu %s Portal Group Tag: %hu"
1494                 " %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1495                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1496                 tfo->get_fabric_name(), pr_reg->pr_aptpl_target_lun);
1497
1498 out_unlock:
1499         spin_unlock(&dev->dev_reservation_lock);
1500         return len;
1501 }
1502
1503
1504 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1505                 char *page)
1506 {
1507         struct se_device *dev = pr_to_dev(item);
1508         const struct target_core_fabric_ops *tfo;
1509         struct t10_pr_registration *pr_reg;
1510         unsigned char buf[384];
1511         char i_buf[PR_REG_ISID_ID_LEN];
1512         ssize_t len = 0;
1513         int reg_count = 0;
1514
1515         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1516
1517         spin_lock(&dev->t10_pr.registration_lock);
1518         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1519                         pr_reg_list) {
1520
1521                 memset(buf, 0, 384);
1522                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1523                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1524                 core_pr_dump_initiator_port(pr_reg, i_buf,
1525                                         PR_REG_ISID_ID_LEN);
1526                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1527                         tfo->get_fabric_name(),
1528                         pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1529                         pr_reg->pr_res_generation);
1530
1531                 if (len + strlen(buf) >= PAGE_SIZE)
1532                         break;
1533
1534                 len += sprintf(page+len, "%s", buf);
1535                 reg_count++;
1536         }
1537         spin_unlock(&dev->t10_pr.registration_lock);
1538
1539         if (!reg_count)
1540                 len += sprintf(page+len, "None\n");
1541
1542         return len;
1543 }
1544
1545 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1546 {
1547         struct se_device *dev = pr_to_dev(item);
1548         struct t10_pr_registration *pr_reg;
1549         ssize_t len = 0;
1550
1551         spin_lock(&dev->dev_reservation_lock);
1552         pr_reg = dev->dev_pr_res_holder;
1553         if (pr_reg) {
1554                 len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1555                         core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1556         } else {
1557                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1558         }
1559
1560         spin_unlock(&dev->dev_reservation_lock);
1561         return len;
1562 }
1563
1564 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1565 {
1566         struct se_device *dev = pr_to_dev(item);
1567
1568         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1569                 return sprintf(page, "SPC_PASSTHROUGH\n");
1570         else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1571                 return sprintf(page, "SPC2_RESERVATIONS\n");
1572         else
1573                 return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1574 }
1575
1576 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1577                 char *page)
1578 {
1579         struct se_device *dev = pr_to_dev(item);
1580
1581         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1582                 return 0;
1583
1584         return sprintf(page, "APTPL Bit Status: %s\n",
1585                 (dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1586 }
1587
1588 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1589                 char *page)
1590 {
1591         struct se_device *dev = pr_to_dev(item);
1592
1593         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1594                 return 0;
1595
1596         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1597 }
1598
1599 enum {
1600         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1601         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1602         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1603         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1604 };
1605
1606 static match_table_t tokens = {
1607         {Opt_initiator_fabric, "initiator_fabric=%s"},
1608         {Opt_initiator_node, "initiator_node=%s"},
1609         {Opt_initiator_sid, "initiator_sid=%s"},
1610         {Opt_sa_res_key, "sa_res_key=%s"},
1611         {Opt_res_holder, "res_holder=%d"},
1612         {Opt_res_type, "res_type=%d"},
1613         {Opt_res_scope, "res_scope=%d"},
1614         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1615         {Opt_mapped_lun, "mapped_lun=%u"},
1616         {Opt_target_fabric, "target_fabric=%s"},
1617         {Opt_target_node, "target_node=%s"},
1618         {Opt_tpgt, "tpgt=%d"},
1619         {Opt_port_rtpi, "port_rtpi=%d"},
1620         {Opt_target_lun, "target_lun=%u"},
1621         {Opt_err, NULL}
1622 };
1623
1624 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1625                 const char *page, size_t count)
1626 {
1627         struct se_device *dev = pr_to_dev(item);
1628         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1629         unsigned char *t_fabric = NULL, *t_port = NULL;
1630         char *orig, *ptr, *opts;
1631         substring_t args[MAX_OPT_ARGS];
1632         unsigned long long tmp_ll;
1633         u64 sa_res_key = 0;
1634         u64 mapped_lun = 0, target_lun = 0;
1635         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1636         u16 tpgt = 0;
1637         u8 type = 0;
1638
1639         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1640                 return count;
1641         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1642                 return count;
1643
1644         if (dev->export_count) {
1645                 pr_debug("Unable to process APTPL metadata while"
1646                         " active fabric exports exist\n");
1647                 return -EINVAL;
1648         }
1649
1650         opts = kstrdup(page, GFP_KERNEL);
1651         if (!opts)
1652                 return -ENOMEM;
1653
1654         orig = opts;
1655         while ((ptr = strsep(&opts, ",\n")) != NULL) {
1656                 if (!*ptr)
1657                         continue;
1658
1659                 token = match_token(ptr, tokens, args);
1660                 switch (token) {
1661                 case Opt_initiator_fabric:
1662                         i_fabric = match_strdup(args);
1663                         if (!i_fabric) {
1664                                 ret = -ENOMEM;
1665                                 goto out;
1666                         }
1667                         break;
1668                 case Opt_initiator_node:
1669                         i_port = match_strdup(args);
1670                         if (!i_port) {
1671                                 ret = -ENOMEM;
1672                                 goto out;
1673                         }
1674                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1675                                 pr_err("APTPL metadata initiator_node="
1676                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1677                                         PR_APTPL_MAX_IPORT_LEN);
1678                                 ret = -EINVAL;
1679                                 break;
1680                         }
1681                         break;
1682                 case Opt_initiator_sid:
1683                         isid = match_strdup(args);
1684                         if (!isid) {
1685                                 ret = -ENOMEM;
1686                                 goto out;
1687                         }
1688                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1689                                 pr_err("APTPL metadata initiator_isid"
1690                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1691                                         PR_REG_ISID_LEN);
1692                                 ret = -EINVAL;
1693                                 break;
1694                         }
1695                         break;
1696                 case Opt_sa_res_key:
1697                         ret = match_u64(args,  &tmp_ll);
1698                         if (ret < 0) {
1699                                 pr_err("kstrtoull() failed for sa_res_key=\n");
1700                                 goto out;
1701                         }
1702                         sa_res_key = (u64)tmp_ll;
1703                         break;
1704                 /*
1705                  * PR APTPL Metadata for Reservation
1706                  */
1707                 case Opt_res_holder:
1708                         ret = match_int(args, &arg);
1709                         if (ret)
1710                                 goto out;
1711                         res_holder = arg;
1712                         break;
1713                 case Opt_res_type:
1714                         ret = match_int(args, &arg);
1715                         if (ret)
1716                                 goto out;
1717                         type = (u8)arg;
1718                         break;
1719                 case Opt_res_scope:
1720                         ret = match_int(args, &arg);
1721                         if (ret)
1722                                 goto out;
1723                         break;
1724                 case Opt_res_all_tg_pt:
1725                         ret = match_int(args, &arg);
1726                         if (ret)
1727                                 goto out;
1728                         all_tg_pt = (int)arg;
1729                         break;
1730                 case Opt_mapped_lun:
1731                         ret = match_u64(args, &tmp_ll);
1732                         if (ret)
1733                                 goto out;
1734                         mapped_lun = (u64)tmp_ll;
1735                         break;
1736                 /*
1737                  * PR APTPL Metadata for Target Port
1738                  */
1739                 case Opt_target_fabric:
1740                         t_fabric = match_strdup(args);
1741                         if (!t_fabric) {
1742                                 ret = -ENOMEM;
1743                                 goto out;
1744                         }
1745                         break;
1746                 case Opt_target_node:
1747                         t_port = match_strdup(args);
1748                         if (!t_port) {
1749                                 ret = -ENOMEM;
1750                                 goto out;
1751                         }
1752                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1753                                 pr_err("APTPL metadata target_node="
1754                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1755                                         PR_APTPL_MAX_TPORT_LEN);
1756                                 ret = -EINVAL;
1757                                 break;
1758                         }
1759                         break;
1760                 case Opt_tpgt:
1761                         ret = match_int(args, &arg);
1762                         if (ret)
1763                                 goto out;
1764                         tpgt = (u16)arg;
1765                         break;
1766                 case Opt_port_rtpi:
1767                         ret = match_int(args, &arg);
1768                         if (ret)
1769                                 goto out;
1770                         break;
1771                 case Opt_target_lun:
1772                         ret = match_u64(args, &tmp_ll);
1773                         if (ret)
1774                                 goto out;
1775                         target_lun = (u64)tmp_ll;
1776                         break;
1777                 default:
1778                         break;
1779                 }
1780         }
1781
1782         if (!i_port || !t_port || !sa_res_key) {
1783                 pr_err("Illegal parameters for APTPL registration\n");
1784                 ret = -EINVAL;
1785                 goto out;
1786         }
1787
1788         if (res_holder && !(type)) {
1789                 pr_err("Illegal PR type: 0x%02x for reservation"
1790                                 " holder\n", type);
1791                 ret = -EINVAL;
1792                 goto out;
1793         }
1794
1795         ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
1796                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1797                         res_holder, all_tg_pt, type);
1798 out:
1799         kfree(i_fabric);
1800         kfree(i_port);
1801         kfree(isid);
1802         kfree(t_fabric);
1803         kfree(t_port);
1804         kfree(orig);
1805         return (ret == 0) ? count : ret;
1806 }
1807
1808
1809 CONFIGFS_ATTR_RO(target_pr_, res_holder);
1810 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
1811 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
1812 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
1813 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
1814 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
1815 CONFIGFS_ATTR_RO(target_pr_, res_type);
1816 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
1817 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
1818
1819 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1820         &target_pr_attr_res_holder,
1821         &target_pr_attr_res_pr_all_tgt_pts,
1822         &target_pr_attr_res_pr_generation,
1823         &target_pr_attr_res_pr_holder_tg_port,
1824         &target_pr_attr_res_pr_registered_i_pts,
1825         &target_pr_attr_res_pr_type,
1826         &target_pr_attr_res_type,
1827         &target_pr_attr_res_aptpl_active,
1828         &target_pr_attr_res_aptpl_metadata,
1829         NULL,
1830 };
1831
1832 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
1833
1834 /*  End functions for struct config_item_type tb_dev_pr_cit */
1835
1836 /*  Start functions for struct config_item_type tb_dev_cit */
1837
1838 static inline struct se_device *to_device(struct config_item *item)
1839 {
1840         return container_of(to_config_group(item), struct se_device, dev_group);
1841 }
1842
1843 static ssize_t target_dev_info_show(struct config_item *item, char *page)
1844 {
1845         struct se_device *dev = to_device(item);
1846         int bl = 0;
1847         ssize_t read_bytes = 0;
1848
1849         transport_dump_dev_state(dev, page, &bl);
1850         read_bytes += bl;
1851         read_bytes += dev->transport->show_configfs_dev_params(dev,
1852                         page+read_bytes);
1853         return read_bytes;
1854 }
1855
1856 static ssize_t target_dev_control_store(struct config_item *item,
1857                 const char *page, size_t count)
1858 {
1859         struct se_device *dev = to_device(item);
1860
1861         return dev->transport->set_configfs_dev_params(dev, page, count);
1862 }
1863
1864 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
1865 {
1866         struct se_device *dev = to_device(item);
1867
1868         if (!(dev->dev_flags & DF_USING_ALIAS))
1869                 return 0;
1870
1871         return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
1872 }
1873
1874 static ssize_t target_dev_alias_store(struct config_item *item,
1875                 const char *page, size_t count)
1876 {
1877         struct se_device *dev = to_device(item);
1878         struct se_hba *hba = dev->se_hba;
1879         ssize_t read_bytes;
1880
1881         if (count > (SE_DEV_ALIAS_LEN-1)) {
1882                 pr_err("alias count: %d exceeds"
1883                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1884                         SE_DEV_ALIAS_LEN-1);
1885                 return -EINVAL;
1886         }
1887
1888         read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
1889         if (!read_bytes)
1890                 return -EINVAL;
1891         if (dev->dev_alias[read_bytes - 1] == '\n')
1892                 dev->dev_alias[read_bytes - 1] = '\0';
1893
1894         dev->dev_flags |= DF_USING_ALIAS;
1895
1896         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1897                 config_item_name(&hba->hba_group.cg_item),
1898                 config_item_name(&dev->dev_group.cg_item),
1899                 dev->dev_alias);
1900
1901         return read_bytes;
1902 }
1903
1904 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
1905 {
1906         struct se_device *dev = to_device(item);
1907
1908         if (!(dev->dev_flags & DF_USING_UDEV_PATH))
1909                 return 0;
1910
1911         return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
1912 }
1913
1914 static ssize_t target_dev_udev_path_store(struct config_item *item,
1915                 const char *page, size_t count)
1916 {
1917         struct se_device *dev = to_device(item);
1918         struct se_hba *hba = dev->se_hba;
1919         ssize_t read_bytes;
1920
1921         if (count > (SE_UDEV_PATH_LEN-1)) {
1922                 pr_err("udev_path count: %d exceeds"
1923                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1924                         SE_UDEV_PATH_LEN-1);
1925                 return -EINVAL;
1926         }
1927
1928         read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
1929                         "%s", page);
1930         if (!read_bytes)
1931                 return -EINVAL;
1932         if (dev->udev_path[read_bytes - 1] == '\n')
1933                 dev->udev_path[read_bytes - 1] = '\0';
1934
1935         dev->dev_flags |= DF_USING_UDEV_PATH;
1936
1937         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1938                 config_item_name(&hba->hba_group.cg_item),
1939                 config_item_name(&dev->dev_group.cg_item),
1940                 dev->udev_path);
1941
1942         return read_bytes;
1943 }
1944
1945 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
1946 {
1947         struct se_device *dev = to_device(item);
1948
1949         return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
1950 }
1951
1952 static ssize_t target_dev_enable_store(struct config_item *item,
1953                 const char *page, size_t count)
1954 {
1955         struct se_device *dev = to_device(item);
1956         char *ptr;
1957         int ret;
1958
1959         ptr = strstr(page, "1");
1960         if (!ptr) {
1961                 pr_err("For dev_enable ops, only valid value"
1962                                 " is \"1\"\n");
1963                 return -EINVAL;
1964         }
1965
1966         ret = target_configure_device(dev);
1967         if (ret)
1968                 return ret;
1969         return count;
1970 }
1971
1972 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
1973 {
1974         struct se_device *dev = to_device(item);
1975         struct config_item *lu_ci;
1976         struct t10_alua_lu_gp *lu_gp;
1977         struct t10_alua_lu_gp_member *lu_gp_mem;
1978         ssize_t len = 0;
1979
1980         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1981         if (!lu_gp_mem)
1982                 return 0;
1983
1984         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1985         lu_gp = lu_gp_mem->lu_gp;
1986         if (lu_gp) {
1987                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1988                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1989                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1990         }
1991         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1992
1993         return len;
1994 }
1995
1996 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
1997                 const char *page, size_t count)
1998 {
1999         struct se_device *dev = to_device(item);
2000         struct se_hba *hba = dev->se_hba;
2001         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2002         struct t10_alua_lu_gp_member *lu_gp_mem;
2003         unsigned char buf[LU_GROUP_NAME_BUF];
2004         int move = 0;
2005
2006         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2007         if (!lu_gp_mem)
2008                 return count;
2009
2010         if (count > LU_GROUP_NAME_BUF) {
2011                 pr_err("ALUA LU Group Alias too large!\n");
2012                 return -EINVAL;
2013         }
2014         memset(buf, 0, LU_GROUP_NAME_BUF);
2015         memcpy(buf, page, count);
2016         /*
2017          * Any ALUA logical unit alias besides "NULL" means we will be
2018          * making a new group association.
2019          */
2020         if (strcmp(strstrip(buf), "NULL")) {
2021                 /*
2022                  * core_alua_get_lu_gp_by_name() will increment reference to
2023                  * struct t10_alua_lu_gp.  This reference is released with
2024                  * core_alua_get_lu_gp_by_name below().
2025                  */
2026                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2027                 if (!lu_gp_new)
2028                         return -ENODEV;
2029         }
2030
2031         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2032         lu_gp = lu_gp_mem->lu_gp;
2033         if (lu_gp) {
2034                 /*
2035                  * Clearing an existing lu_gp association, and replacing
2036                  * with NULL
2037                  */
2038                 if (!lu_gp_new) {
2039                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2040                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2041                                 " %hu\n",
2042                                 config_item_name(&hba->hba_group.cg_item),
2043                                 config_item_name(&dev->dev_group.cg_item),
2044                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
2045                                 lu_gp->lu_gp_id);
2046
2047                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2048                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2049
2050                         return count;
2051                 }
2052                 /*
2053                  * Removing existing association of lu_gp_mem with lu_gp
2054                  */
2055                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2056                 move = 1;
2057         }
2058         /*
2059          * Associate lu_gp_mem with lu_gp_new.
2060          */
2061         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2062         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2063
2064         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2065                 " core/alua/lu_gps/%s, ID: %hu\n",
2066                 (move) ? "Moving" : "Adding",
2067                 config_item_name(&hba->hba_group.cg_item),
2068                 config_item_name(&dev->dev_group.cg_item),
2069                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2070                 lu_gp_new->lu_gp_id);
2071
2072         core_alua_put_lu_gp_from_name(lu_gp_new);
2073         return count;
2074 }
2075
2076 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2077 {
2078         struct se_device *dev = to_device(item);
2079         struct t10_alua_lba_map *map;
2080         struct t10_alua_lba_map_member *mem;
2081         char *b = page;
2082         int bl = 0;
2083         char state;
2084
2085         spin_lock(&dev->t10_alua.lba_map_lock);
2086         if (!list_empty(&dev->t10_alua.lba_map_list))
2087             bl += sprintf(b + bl, "%u %u\n",
2088                           dev->t10_alua.lba_map_segment_size,
2089                           dev->t10_alua.lba_map_segment_multiplier);
2090         list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2091                 bl += sprintf(b + bl, "%llu %llu",
2092                               map->lba_map_first_lba, map->lba_map_last_lba);
2093                 list_for_each_entry(mem, &map->lba_map_mem_list,
2094                                     lba_map_mem_list) {
2095                         switch (mem->lba_map_mem_alua_state) {
2096                         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2097                                 state = 'O';
2098                                 break;
2099                         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2100                                 state = 'A';
2101                                 break;
2102                         case ALUA_ACCESS_STATE_STANDBY:
2103                                 state = 'S';
2104                                 break;
2105                         case ALUA_ACCESS_STATE_UNAVAILABLE:
2106                                 state = 'U';
2107                                 break;
2108                         default:
2109                                 state = '.';
2110                                 break;
2111                         }
2112                         bl += sprintf(b + bl, " %d:%c",
2113                                       mem->lba_map_mem_alua_pg_id, state);
2114                 }
2115                 bl += sprintf(b + bl, "\n");
2116         }
2117         spin_unlock(&dev->t10_alua.lba_map_lock);
2118         return bl;
2119 }
2120
2121 static ssize_t target_dev_lba_map_store(struct config_item *item,
2122                 const char *page, size_t count)
2123 {
2124         struct se_device *dev = to_device(item);
2125         struct t10_alua_lba_map *lba_map = NULL;
2126         struct list_head lba_list;
2127         char *map_entries, *orig, *ptr;
2128         char state;
2129         int pg_num = -1, pg;
2130         int ret = 0, num = 0, pg_id, alua_state;
2131         unsigned long start_lba = -1, end_lba = -1;
2132         unsigned long segment_size = -1, segment_mult = -1;
2133
2134         orig = map_entries = kstrdup(page, GFP_KERNEL);
2135         if (!map_entries)
2136                 return -ENOMEM;
2137
2138         INIT_LIST_HEAD(&lba_list);
2139         while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2140                 if (!*ptr)
2141                         continue;
2142
2143                 if (num == 0) {
2144                         if (sscanf(ptr, "%lu %lu\n",
2145                                    &segment_size, &segment_mult) != 2) {
2146                                 pr_err("Invalid line %d\n", num);
2147                                 ret = -EINVAL;
2148                                 break;
2149                         }
2150                         num++;
2151                         continue;
2152                 }
2153                 if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2154                         pr_err("Invalid line %d\n", num);
2155                         ret = -EINVAL;
2156                         break;
2157                 }
2158                 ptr = strchr(ptr, ' ');
2159                 if (!ptr) {
2160                         pr_err("Invalid line %d, missing end lba\n", num);
2161                         ret = -EINVAL;
2162                         break;
2163                 }
2164                 ptr++;
2165                 ptr = strchr(ptr, ' ');
2166                 if (!ptr) {
2167                         pr_err("Invalid line %d, missing state definitions\n",
2168                                num);
2169                         ret = -EINVAL;
2170                         break;
2171                 }
2172                 ptr++;
2173                 lba_map = core_alua_allocate_lba_map(&lba_list,
2174                                                      start_lba, end_lba);
2175                 if (IS_ERR(lba_map)) {
2176                         ret = PTR_ERR(lba_map);
2177                         break;
2178                 }
2179                 pg = 0;
2180                 while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2181                         switch (state) {
2182                         case 'O':
2183                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2184                                 break;
2185                         case 'A':
2186                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2187                                 break;
2188                         case 'S':
2189                                 alua_state = ALUA_ACCESS_STATE_STANDBY;
2190                                 break;
2191                         case 'U':
2192                                 alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2193                                 break;
2194                         default:
2195                                 pr_err("Invalid ALUA state '%c'\n", state);
2196                                 ret = -EINVAL;
2197                                 goto out;
2198                         }
2199
2200                         ret = core_alua_allocate_lba_map_mem(lba_map,
2201                                                              pg_id, alua_state);
2202                         if (ret) {
2203                                 pr_err("Invalid target descriptor %d:%c "
2204                                        "at line %d\n",
2205                                        pg_id, state, num);
2206                                 break;
2207                         }
2208                         pg++;
2209                         ptr = strchr(ptr, ' ');
2210                         if (ptr)
2211                                 ptr++;
2212                         else
2213                                 break;
2214                 }
2215                 if (pg_num == -1)
2216                     pg_num = pg;
2217                 else if (pg != pg_num) {
2218                         pr_err("Only %d from %d port groups definitions "
2219                                "at line %d\n", pg, pg_num, num);
2220                         ret = -EINVAL;
2221                         break;
2222                 }
2223                 num++;
2224         }
2225 out:
2226         if (ret) {
2227                 core_alua_free_lba_map(&lba_list);
2228                 count = ret;
2229         } else
2230                 core_alua_set_lba_map(dev, &lba_list,
2231                                       segment_size, segment_mult);
2232         kfree(orig);
2233         return count;
2234 }
2235
2236 CONFIGFS_ATTR_RO(target_dev_, info);
2237 CONFIGFS_ATTR_WO(target_dev_, control);
2238 CONFIGFS_ATTR(target_dev_, alias);
2239 CONFIGFS_ATTR(target_dev_, udev_path);
2240 CONFIGFS_ATTR(target_dev_, enable);
2241 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2242 CONFIGFS_ATTR(target_dev_, lba_map);
2243
2244 static struct configfs_attribute *target_core_dev_attrs[] = {
2245         &target_dev_attr_info,
2246         &target_dev_attr_control,
2247         &target_dev_attr_alias,
2248         &target_dev_attr_udev_path,
2249         &target_dev_attr_enable,
2250         &target_dev_attr_alua_lu_gp,
2251         &target_dev_attr_lba_map,
2252         NULL,
2253 };
2254
2255 static void target_core_dev_release(struct config_item *item)
2256 {
2257         struct config_group *dev_cg = to_config_group(item);
2258         struct se_device *dev =
2259                 container_of(dev_cg, struct se_device, dev_group);
2260
2261         target_free_device(dev);
2262 }
2263
2264 /*
2265  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2266  * within target_fabric_port_link()
2267  */
2268 struct configfs_item_operations target_core_dev_item_ops = {
2269         .release                = target_core_dev_release,
2270 };
2271
2272 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2273
2274 /* End functions for struct config_item_type tb_dev_cit */
2275
2276 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2277
2278 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2279 {
2280         return container_of(to_config_group(item), struct t10_alua_lu_gp,
2281                         lu_gp_group);
2282 }
2283
2284 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2285 {
2286         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2287
2288         if (!lu_gp->lu_gp_valid_id)
2289                 return 0;
2290         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2291 }
2292
2293 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2294                 const char *page, size_t count)
2295 {
2296         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2297         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2298         unsigned long lu_gp_id;
2299         int ret;
2300
2301         ret = kstrtoul(page, 0, &lu_gp_id);
2302         if (ret < 0) {
2303                 pr_err("kstrtoul() returned %d for"
2304                         " lu_gp_id\n", ret);
2305                 return ret;
2306         }
2307         if (lu_gp_id > 0x0000ffff) {
2308                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2309                         " 0x0000ffff\n", lu_gp_id);
2310                 return -EINVAL;
2311         }
2312
2313         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2314         if (ret < 0)
2315                 return -EINVAL;
2316
2317         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2318                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2319                 config_item_name(&alua_lu_gp_cg->cg_item),
2320                 lu_gp->lu_gp_id);
2321
2322         return count;
2323 }
2324
2325 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2326 {
2327         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2328         struct se_device *dev;
2329         struct se_hba *hba;
2330         struct t10_alua_lu_gp_member *lu_gp_mem;
2331         ssize_t len = 0, cur_len;
2332         unsigned char buf[LU_GROUP_NAME_BUF];
2333
2334         memset(buf, 0, LU_GROUP_NAME_BUF);
2335
2336         spin_lock(&lu_gp->lu_gp_lock);
2337         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2338                 dev = lu_gp_mem->lu_gp_mem_dev;
2339                 hba = dev->se_hba;
2340
2341                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2342                         config_item_name(&hba->hba_group.cg_item),
2343                         config_item_name(&dev->dev_group.cg_item));
2344                 cur_len++; /* Extra byte for NULL terminator */
2345
2346                 if ((cur_len + len) > PAGE_SIZE) {
2347                         pr_warn("Ran out of lu_gp_show_attr"
2348                                 "_members buffer\n");
2349                         break;
2350                 }
2351                 memcpy(page+len, buf, cur_len);
2352                 len += cur_len;
2353         }
2354         spin_unlock(&lu_gp->lu_gp_lock);
2355
2356         return len;
2357 }
2358
2359 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2360 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2361
2362 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2363         &target_lu_gp_attr_lu_gp_id,
2364         &target_lu_gp_attr_members,
2365         NULL,
2366 };
2367
2368 static void target_core_alua_lu_gp_release(struct config_item *item)
2369 {
2370         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2371                         struct t10_alua_lu_gp, lu_gp_group);
2372
2373         core_alua_free_lu_gp(lu_gp);
2374 }
2375
2376 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2377         .release                = target_core_alua_lu_gp_release,
2378 };
2379
2380 static const struct config_item_type target_core_alua_lu_gp_cit = {
2381         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2382         .ct_attrs               = target_core_alua_lu_gp_attrs,
2383         .ct_owner               = THIS_MODULE,
2384 };
2385
2386 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2387
2388 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2389
2390 static struct config_group *target_core_alua_create_lu_gp(
2391         struct config_group *group,
2392         const char *name)
2393 {
2394         struct t10_alua_lu_gp *lu_gp;
2395         struct config_group *alua_lu_gp_cg = NULL;
2396         struct config_item *alua_lu_gp_ci = NULL;
2397
2398         lu_gp = core_alua_allocate_lu_gp(name, 0);
2399         if (IS_ERR(lu_gp))
2400                 return NULL;
2401
2402         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2403         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2404
2405         config_group_init_type_name(alua_lu_gp_cg, name,
2406                         &target_core_alua_lu_gp_cit);
2407
2408         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2409                 " Group: core/alua/lu_gps/%s\n",
2410                 config_item_name(alua_lu_gp_ci));
2411
2412         return alua_lu_gp_cg;
2413
2414 }
2415
2416 static void target_core_alua_drop_lu_gp(
2417         struct config_group *group,
2418         struct config_item *item)
2419 {
2420         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2421                         struct t10_alua_lu_gp, lu_gp_group);
2422
2423         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2424                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2425                 config_item_name(item), lu_gp->lu_gp_id);
2426         /*
2427          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2428          * -> target_core_alua_lu_gp_release()
2429          */
2430         config_item_put(item);
2431 }
2432
2433 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2434         .make_group             = &target_core_alua_create_lu_gp,
2435         .drop_item              = &target_core_alua_drop_lu_gp,
2436 };
2437
2438 static const struct config_item_type target_core_alua_lu_gps_cit = {
2439         .ct_item_ops            = NULL,
2440         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2441         .ct_owner               = THIS_MODULE,
2442 };
2443
2444 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2445
2446 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2447
2448 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2449 {
2450         return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2451                         tg_pt_gp_group);
2452 }
2453
2454 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2455                 char *page)
2456 {
2457         return sprintf(page, "%d\n",
2458                        to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2459 }
2460
2461 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2462                 const char *page, size_t count)
2463 {
2464         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2465         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2466         unsigned long tmp;
2467         int new_state, ret;
2468
2469         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2470                 pr_err("Unable to do implicit ALUA on non valid"
2471                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2472                 return -EINVAL;
2473         }
2474         if (!(dev->dev_flags & DF_CONFIGURED)) {
2475                 pr_err("Unable to set alua_access_state while device is"
2476                        " not configured\n");
2477                 return -ENODEV;
2478         }
2479
2480         ret = kstrtoul(page, 0, &tmp);
2481         if (ret < 0) {
2482                 pr_err("Unable to extract new ALUA access state from"
2483                                 " %s\n", page);
2484                 return ret;
2485         }
2486         new_state = (int)tmp;
2487
2488         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2489                 pr_err("Unable to process implicit configfs ALUA"
2490                         " transition while TPGS_IMPLICIT_ALUA is disabled\n");
2491                 return -EINVAL;
2492         }
2493         if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2494             new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2495                 /* LBA DEPENDENT is only allowed with implicit ALUA */
2496                 pr_err("Unable to process implicit configfs ALUA transition"
2497                        " while explicit ALUA management is enabled\n");
2498                 return -EINVAL;
2499         }
2500
2501         ret = core_alua_do_port_transition(tg_pt_gp, dev,
2502                                         NULL, NULL, new_state, 0);
2503         return (!ret) ? count : -EINVAL;
2504 }
2505
2506 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2507                 char *page)
2508 {
2509         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2510         return sprintf(page, "%s\n",
2511                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2512 }
2513
2514 static ssize_t target_tg_pt_gp_alua_access_status_store(
2515                 struct config_item *item, const char *page, size_t count)
2516 {
2517         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2518         unsigned long tmp;
2519         int new_status, ret;
2520
2521         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2522                 pr_err("Unable to do set ALUA access status on non"
2523                         " valid tg_pt_gp ID: %hu\n",
2524                         tg_pt_gp->tg_pt_gp_valid_id);
2525                 return -EINVAL;
2526         }
2527
2528         ret = kstrtoul(page, 0, &tmp);
2529         if (ret < 0) {
2530                 pr_err("Unable to extract new ALUA access status"
2531                                 " from %s\n", page);
2532                 return ret;
2533         }
2534         new_status = (int)tmp;
2535
2536         if ((new_status != ALUA_STATUS_NONE) &&
2537             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2538             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2539                 pr_err("Illegal ALUA access status: 0x%02x\n",
2540                                 new_status);
2541                 return -EINVAL;
2542         }
2543
2544         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2545         return count;
2546 }
2547
2548 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2549                 char *page)
2550 {
2551         return core_alua_show_access_type(to_tg_pt_gp(item), page);
2552 }
2553
2554 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2555                 const char *page, size_t count)
2556 {
2557         return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2558 }
2559
2560 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
2561 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
2562                 struct config_item *item, char *p)                      \
2563 {                                                                       \
2564         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2565         return sprintf(p, "%d\n",                                       \
2566                 !!(t->tg_pt_gp_alua_supported_states & _bit));          \
2567 }                                                                       \
2568                                                                         \
2569 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
2570                 struct config_item *item, const char *p, size_t c)      \
2571 {                                                                       \
2572         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2573         unsigned long tmp;                                              \
2574         int ret;                                                        \
2575                                                                         \
2576         if (!t->tg_pt_gp_valid_id) {                                    \
2577                 pr_err("Unable to do set " #_name " ALUA state on non"  \
2578                        " valid tg_pt_gp ID: %hu\n",                     \
2579                        t->tg_pt_gp_valid_id);                           \
2580                 return -EINVAL;                                         \
2581         }                                                               \
2582                                                                         \
2583         ret = kstrtoul(p, 0, &tmp);                                     \
2584         if (ret < 0) {                                                  \
2585                 pr_err("Invalid value '%s', must be '0' or '1'\n", p);  \
2586                 return -EINVAL;                                         \
2587         }                                                               \
2588         if (tmp > 1) {                                                  \
2589                 pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2590                 return -EINVAL;                                         \
2591         }                                                               \
2592         if (tmp)                                                        \
2593                 t->tg_pt_gp_alua_supported_states |= _bit;              \
2594         else                                                            \
2595                 t->tg_pt_gp_alua_supported_states &= ~_bit;             \
2596                                                                         \
2597         return c;                                                       \
2598 }
2599
2600 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2601 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2602 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2603 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2604 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2605 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2606 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2607
2608 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2609                 struct config_item *item, char *page)
2610 {
2611         return sprintf(page, "%d\n",
2612                 to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2613 }
2614
2615 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2616                 struct config_item *item, const char *page, size_t count)
2617 {
2618         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2619         unsigned long tmp;
2620         int ret;
2621
2622         ret = kstrtoul(page, 0, &tmp);
2623         if (ret < 0) {
2624                 pr_err("Unable to extract alua_write_metadata\n");
2625                 return ret;
2626         }
2627
2628         if ((tmp != 0) && (tmp != 1)) {
2629                 pr_err("Illegal value for alua_write_metadata:"
2630                         " %lu\n", tmp);
2631                 return -EINVAL;
2632         }
2633         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2634
2635         return count;
2636 }
2637
2638 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2639                 char *page)
2640 {
2641         return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2642 }
2643
2644 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2645                 const char *page, size_t count)
2646 {
2647         return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2648                         count);
2649 }
2650
2651 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2652                 char *page)
2653 {
2654         return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2655 }
2656
2657 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
2658                 const char *page, size_t count)
2659 {
2660         return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
2661                         count);
2662 }
2663
2664 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
2665                 struct config_item *item, char *page)
2666 {
2667         return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
2668 }
2669
2670 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
2671                 struct config_item *item, const char *page, size_t count)
2672 {
2673         return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
2674                         count);
2675 }
2676
2677 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
2678                 char *page)
2679 {
2680         return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
2681 }
2682
2683 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
2684                 const char *page, size_t count)
2685 {
2686         return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
2687 }
2688
2689 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
2690                 char *page)
2691 {
2692         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2693
2694         if (!tg_pt_gp->tg_pt_gp_valid_id)
2695                 return 0;
2696         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2697 }
2698
2699 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
2700                 const char *page, size_t count)
2701 {
2702         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2703         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2704         unsigned long tg_pt_gp_id;
2705         int ret;
2706
2707         ret = kstrtoul(page, 0, &tg_pt_gp_id);
2708         if (ret < 0) {
2709                 pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
2710                        page);
2711                 return ret;
2712         }
2713         if (tg_pt_gp_id > 0x0000ffff) {
2714                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
2715                        tg_pt_gp_id);
2716                 return -EINVAL;
2717         }
2718
2719         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2720         if (ret < 0)
2721                 return -EINVAL;
2722
2723         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2724                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2725                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2726                 tg_pt_gp->tg_pt_gp_id);
2727
2728         return count;
2729 }
2730
2731 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
2732                 char *page)
2733 {
2734         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2735         struct se_lun *lun;
2736         ssize_t len = 0, cur_len;
2737         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2738
2739         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2740
2741         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2742         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
2743                         lun_tg_pt_gp_link) {
2744                 struct se_portal_group *tpg = lun->lun_tpg;
2745
2746                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2747                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2748                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2749                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2750                         config_item_name(&lun->lun_group.cg_item));
2751                 cur_len++; /* Extra byte for NULL terminator */
2752
2753                 if ((cur_len + len) > PAGE_SIZE) {
2754                         pr_warn("Ran out of lu_gp_show_attr"
2755                                 "_members buffer\n");
2756                         break;
2757                 }
2758                 memcpy(page+len, buf, cur_len);
2759                 len += cur_len;
2760         }
2761         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2762
2763         return len;
2764 }
2765
2766 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
2767 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
2768 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
2769 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
2770 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
2771 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
2772 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
2773 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
2774 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
2775 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
2776 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
2777 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
2778 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
2779 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
2780 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
2781 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
2782 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
2783
2784 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2785         &target_tg_pt_gp_attr_alua_access_state,
2786         &target_tg_pt_gp_attr_alua_access_status,
2787         &target_tg_pt_gp_attr_alua_access_type,
2788         &target_tg_pt_gp_attr_alua_support_transitioning,
2789         &target_tg_pt_gp_attr_alua_support_offline,
2790         &target_tg_pt_gp_attr_alua_support_lba_dependent,
2791         &target_tg_pt_gp_attr_alua_support_unavailable,
2792         &target_tg_pt_gp_attr_alua_support_standby,
2793         &target_tg_pt_gp_attr_alua_support_active_nonoptimized,
2794         &target_tg_pt_gp_attr_alua_support_active_optimized,
2795         &target_tg_pt_gp_attr_alua_write_metadata,
2796         &target_tg_pt_gp_attr_nonop_delay_msecs,
2797         &target_tg_pt_gp_attr_trans_delay_msecs,
2798         &target_tg_pt_gp_attr_implicit_trans_secs,
2799         &target_tg_pt_gp_attr_preferred,
2800         &target_tg_pt_gp_attr_tg_pt_gp_id,
2801         &target_tg_pt_gp_attr_members,
2802         NULL,
2803 };
2804
2805 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2806 {
2807         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2808                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2809
2810         core_alua_free_tg_pt_gp(tg_pt_gp);
2811 }
2812
2813 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2814         .release                = target_core_alua_tg_pt_gp_release,
2815 };
2816
2817 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
2818         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2819         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2820         .ct_owner               = THIS_MODULE,
2821 };
2822
2823 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2824
2825 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2826
2827 static struct config_group *target_core_alua_create_tg_pt_gp(
2828         struct config_group *group,
2829         const char *name)
2830 {
2831         struct t10_alua *alua = container_of(group, struct t10_alua,
2832                                         alua_tg_pt_gps_group);
2833         struct t10_alua_tg_pt_gp *tg_pt_gp;
2834         struct config_group *alua_tg_pt_gp_cg = NULL;
2835         struct config_item *alua_tg_pt_gp_ci = NULL;
2836
2837         tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
2838         if (!tg_pt_gp)
2839                 return NULL;
2840
2841         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2842         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2843
2844         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2845                         &target_core_alua_tg_pt_gp_cit);
2846
2847         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2848                 " Group: alua/tg_pt_gps/%s\n",
2849                 config_item_name(alua_tg_pt_gp_ci));
2850
2851         return alua_tg_pt_gp_cg;
2852 }
2853
2854 static void target_core_alua_drop_tg_pt_gp(
2855         struct config_group *group,
2856         struct config_item *item)
2857 {
2858         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2859                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2860
2861         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2862                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2863                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2864         /*
2865          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2866          * -> target_core_alua_tg_pt_gp_release().
2867          */
2868         config_item_put(item);
2869 }
2870
2871 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2872         .make_group             = &target_core_alua_create_tg_pt_gp,
2873         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2874 };
2875
2876 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
2877
2878 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2879
2880 /* Start functions for struct config_item_type target_core_alua_cit */
2881
2882 /*
2883  * target_core_alua_cit is a ConfigFS group that lives under
2884  * /sys/kernel/config/target/core/alua.  There are default groups
2885  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2886  * target_core_alua_cit in target_core_init_configfs() below.
2887  */
2888 static const struct config_item_type target_core_alua_cit = {
2889         .ct_item_ops            = NULL,
2890         .ct_attrs               = NULL,
2891         .ct_owner               = THIS_MODULE,
2892 };
2893
2894 /* End functions for struct config_item_type target_core_alua_cit */
2895
2896 /* Start functions for struct config_item_type tb_dev_stat_cit */
2897
2898 static struct config_group *target_core_stat_mkdir(
2899         struct config_group *group,
2900         const char *name)
2901 {
2902         return ERR_PTR(-ENOSYS);
2903 }
2904
2905 static void target_core_stat_rmdir(
2906         struct config_group *group,
2907         struct config_item *item)
2908 {
2909         return;
2910 }
2911
2912 static struct configfs_group_operations target_core_stat_group_ops = {
2913         .make_group             = &target_core_stat_mkdir,
2914         .drop_item              = &target_core_stat_rmdir,
2915 };
2916
2917 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
2918
2919 /* End functions for struct config_item_type tb_dev_stat_cit */
2920
2921 /* Start functions for struct config_item_type target_core_hba_cit */
2922
2923 static struct config_group *target_core_make_subdev(
2924         struct config_group *group,
2925         const char *name)
2926 {
2927         struct t10_alua_tg_pt_gp *tg_pt_gp;
2928         struct config_item *hba_ci = &group->cg_item;
2929         struct se_hba *hba = item_to_hba(hba_ci);
2930         struct target_backend *tb = hba->backend;
2931         struct se_device *dev;
2932         int errno = -ENOMEM, ret;
2933
2934         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2935         if (ret)
2936                 return ERR_PTR(ret);
2937
2938         dev = target_alloc_device(hba, name);
2939         if (!dev)
2940                 goto out_unlock;
2941
2942         config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
2943
2944         config_group_init_type_name(&dev->dev_action_group, "action",
2945                         &tb->tb_dev_action_cit);
2946         configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
2947
2948         config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
2949                         &tb->tb_dev_attrib_cit);
2950         configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
2951
2952         config_group_init_type_name(&dev->dev_pr_group, "pr",
2953                         &tb->tb_dev_pr_cit);
2954         configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
2955
2956         config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
2957                         &tb->tb_dev_wwn_cit);
2958         configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
2959                         &dev->dev_group);
2960
2961         config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
2962                         "alua", &tb->tb_dev_alua_tg_pt_gps_cit);
2963         configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
2964                         &dev->dev_group);
2965
2966         config_group_init_type_name(&dev->dev_stat_grps.stat_group,
2967                         "statistics", &tb->tb_dev_stat_cit);
2968         configfs_add_default_group(&dev->dev_stat_grps.stat_group,
2969                         &dev->dev_group);
2970
2971         /*
2972          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2973          */
2974         tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
2975         if (!tg_pt_gp)
2976                 goto out_free_device;
2977         dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2978
2979         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2980                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2981         configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
2982                         &dev->t10_alua.alua_tg_pt_gps_group);
2983
2984         /*
2985          * Add core/$HBA/$DEV/statistics/ default groups
2986          */
2987         target_stat_setup_dev_default_groups(dev);
2988
2989         mutex_unlock(&hba->hba_access_mutex);
2990         return &dev->dev_group;
2991
2992 out_free_device:
2993         target_free_device(dev);
2994 out_unlock:
2995         mutex_unlock(&hba->hba_access_mutex);
2996         return ERR_PTR(errno);
2997 }
2998
2999 static void target_core_drop_subdev(
3000         struct config_group *group,
3001         struct config_item *item)
3002 {
3003         struct config_group *dev_cg = to_config_group(item);
3004         struct se_device *dev =
3005                 container_of(dev_cg, struct se_device, dev_group);
3006         struct se_hba *hba;
3007
3008         hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3009
3010         mutex_lock(&hba->hba_access_mutex);
3011
3012         configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3013         configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3014
3015         /*
3016          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3017          * directly from target_core_alua_tg_pt_gp_release().
3018          */
3019         dev->t10_alua.default_tg_pt_gp = NULL;
3020
3021         configfs_remove_default_groups(dev_cg);
3022
3023         /*
3024          * se_dev is released from target_core_dev_item_ops->release()
3025          */
3026         config_item_put(item);
3027         mutex_unlock(&hba->hba_access_mutex);
3028 }
3029
3030 static struct configfs_group_operations target_core_hba_group_ops = {
3031         .make_group             = target_core_make_subdev,
3032         .drop_item              = target_core_drop_subdev,
3033 };
3034
3035
3036 static inline struct se_hba *to_hba(struct config_item *item)
3037 {
3038         return container_of(to_config_group(item), struct se_hba, hba_group);
3039 }
3040
3041 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3042 {
3043         struct se_hba *hba = to_hba(item);
3044
3045         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3046                         hba->hba_id, hba->backend->ops->name,
3047                         TARGET_CORE_VERSION);
3048 }
3049
3050 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3051 {
3052         struct se_hba *hba = to_hba(item);
3053         int hba_mode = 0;
3054
3055         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3056                 hba_mode = 1;
3057
3058         return sprintf(page, "%d\n", hba_mode);
3059 }
3060
3061 static ssize_t target_hba_mode_store(struct config_item *item,
3062                 const char *page, size_t count)
3063 {
3064         struct se_hba *hba = to_hba(item);
3065         unsigned long mode_flag;
3066         int ret;
3067
3068         if (hba->backend->ops->pmode_enable_hba == NULL)
3069                 return -EINVAL;
3070
3071         ret = kstrtoul(page, 0, &mode_flag);
3072         if (ret < 0) {
3073                 pr_err("Unable to extract hba mode flag: %d\n", ret);
3074                 return ret;
3075         }
3076
3077         if (hba->dev_count) {
3078                 pr_err("Unable to set hba_mode with active devices\n");
3079                 return -EINVAL;
3080         }
3081
3082         ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3083         if (ret < 0)
3084                 return -EINVAL;
3085         if (ret > 0)
3086                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3087         else if (ret == 0)
3088                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3089
3090         return count;
3091 }
3092
3093 CONFIGFS_ATTR_RO(target_, hba_info);
3094 CONFIGFS_ATTR(target_, hba_mode);
3095
3096 static void target_core_hba_release(struct config_item *item)
3097 {
3098         struct se_hba *hba = container_of(to_config_group(item),
3099                                 struct se_hba, hba_group);
3100         core_delete_hba(hba);
3101 }
3102
3103 static struct configfs_attribute *target_core_hba_attrs[] = {
3104         &target_attr_hba_info,
3105         &target_attr_hba_mode,
3106         NULL,
3107 };
3108
3109 static struct configfs_item_operations target_core_hba_item_ops = {
3110         .release                = target_core_hba_release,
3111 };
3112
3113 static const struct config_item_type target_core_hba_cit = {
3114         .ct_item_ops            = &target_core_hba_item_ops,
3115         .ct_group_ops           = &target_core_hba_group_ops,
3116         .ct_attrs               = target_core_hba_attrs,
3117         .ct_owner               = THIS_MODULE,
3118 };
3119
3120 static struct config_group *target_core_call_addhbatotarget(
3121         struct config_group *group,
3122         const char *name)
3123 {
3124         char *se_plugin_str, *str, *str2;
3125         struct se_hba *hba;
3126         char buf[TARGET_CORE_NAME_MAX_LEN];
3127         unsigned long plugin_dep_id = 0;
3128         int ret;
3129
3130         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3131         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3132                 pr_err("Passed *name strlen(): %d exceeds"
3133                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3134                         TARGET_CORE_NAME_MAX_LEN);
3135                 return ERR_PTR(-ENAMETOOLONG);
3136         }
3137         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3138
3139         str = strstr(buf, "_");
3140         if (!str) {
3141                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3142                 return ERR_PTR(-EINVAL);
3143         }
3144         se_plugin_str = buf;
3145         /*
3146          * Special case for subsystem plugins that have "_" in their names.
3147          * Namely rd_direct and rd_mcp..
3148          */
3149         str2 = strstr(str+1, "_");
3150         if (str2) {
3151                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3152                 str2++; /* Skip to start of plugin dependent ID */
3153                 str = str2;
3154         } else {
3155                 *str = '\0'; /* Terminate for *se_plugin_str */
3156                 str++; /* Skip to start of plugin dependent ID */
3157         }
3158
3159         ret = kstrtoul(str, 0, &plugin_dep_id);
3160         if (ret < 0) {
3161                 pr_err("kstrtoul() returned %d for"
3162                                 " plugin_dep_id\n", ret);
3163                 return ERR_PTR(ret);
3164         }
3165         /*
3166          * Load up TCM subsystem plugins if they have not already been loaded.
3167          */
3168         transport_subsystem_check_init();
3169
3170         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3171         if (IS_ERR(hba))
3172                 return ERR_CAST(hba);
3173
3174         config_group_init_type_name(&hba->hba_group, name,
3175                         &target_core_hba_cit);
3176
3177         return &hba->hba_group;
3178 }
3179
3180 static void target_core_call_delhbafromtarget(
3181         struct config_group *group,
3182         struct config_item *item)
3183 {
3184         /*
3185          * core_delete_hba() is called from target_core_hba_item_ops->release()
3186          * -> target_core_hba_release()
3187          */
3188         config_item_put(item);
3189 }
3190
3191 static struct configfs_group_operations target_core_group_ops = {
3192         .make_group     = target_core_call_addhbatotarget,
3193         .drop_item      = target_core_call_delhbafromtarget,
3194 };
3195
3196 static const struct config_item_type target_core_cit = {
3197         .ct_item_ops    = NULL,
3198         .ct_group_ops   = &target_core_group_ops,
3199         .ct_attrs       = NULL,
3200         .ct_owner       = THIS_MODULE,
3201 };
3202
3203 /* Stop functions for struct config_item_type target_core_hba_cit */
3204
3205 void target_setup_backend_cits(struct target_backend *tb)
3206 {
3207         target_core_setup_dev_cit(tb);
3208         target_core_setup_dev_action_cit(tb);
3209         target_core_setup_dev_attrib_cit(tb);
3210         target_core_setup_dev_pr_cit(tb);
3211         target_core_setup_dev_wwn_cit(tb);
3212         target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3213         target_core_setup_dev_stat_cit(tb);
3214 }
3215
3216 static int __init target_core_init_configfs(void)
3217 {
3218         struct configfs_subsystem *subsys = &target_core_fabrics;
3219         struct t10_alua_lu_gp *lu_gp;
3220         int ret;
3221
3222         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3223                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3224                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3225
3226         config_group_init(&subsys->su_group);
3227         mutex_init(&subsys->su_mutex);
3228
3229         ret = init_se_kmem_caches();
3230         if (ret < 0)
3231                 return ret;
3232         /*
3233          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3234          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3235          */
3236         config_group_init_type_name(&target_core_hbagroup, "core",
3237                         &target_core_cit);
3238         configfs_add_default_group(&target_core_hbagroup, &subsys->su_group);
3239
3240         /*
3241          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3242          */
3243         config_group_init_type_name(&alua_group, "alua", &target_core_alua_cit);
3244         configfs_add_default_group(&alua_group, &target_core_hbagroup);
3245
3246         /*
3247          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3248          * groups under /sys/kernel/config/target/core/alua/
3249          */
3250         config_group_init_type_name(&alua_lu_gps_group, "lu_gps",
3251                         &target_core_alua_lu_gps_cit);
3252         configfs_add_default_group(&alua_lu_gps_group, &alua_group);
3253
3254         /*
3255          * Add core/alua/lu_gps/default_lu_gp
3256          */
3257         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3258         if (IS_ERR(lu_gp)) {
3259                 ret = -ENOMEM;
3260                 goto out_global;
3261         }
3262
3263         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3264                                 &target_core_alua_lu_gp_cit);
3265         configfs_add_default_group(&lu_gp->lu_gp_group, &alua_lu_gps_group);
3266
3267         default_lu_gp = lu_gp;
3268
3269         /*
3270          * Register the target_core_mod subsystem with configfs.
3271          */
3272         ret = configfs_register_subsystem(subsys);
3273         if (ret < 0) {
3274                 pr_err("Error %d while registering subsystem %s\n",
3275                         ret, subsys->su_group.cg_item.ci_namebuf);
3276                 goto out_global;
3277         }
3278         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3279                 " Infrastructure: "TARGET_CORE_VERSION" on %s/%s"
3280                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3281         /*
3282          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3283          */
3284         ret = rd_module_init();
3285         if (ret < 0)
3286                 goto out;
3287
3288         ret = core_dev_setup_virtual_lun0();
3289         if (ret < 0)
3290                 goto out;
3291
3292         ret = target_xcopy_setup_pt();
3293         if (ret < 0)
3294                 goto out;
3295
3296         return 0;
3297
3298 out:
3299         configfs_unregister_subsystem(subsys);
3300         core_dev_release_virtual_lun0();
3301         rd_module_exit();
3302 out_global:
3303         if (default_lu_gp) {
3304                 core_alua_free_lu_gp(default_lu_gp);
3305                 default_lu_gp = NULL;
3306         }
3307         release_se_kmem_caches();
3308         return ret;
3309 }
3310
3311 static void __exit target_core_exit_configfs(void)
3312 {
3313         configfs_remove_default_groups(&alua_lu_gps_group);
3314         configfs_remove_default_groups(&alua_group);
3315         configfs_remove_default_groups(&target_core_hbagroup);
3316
3317         /*
3318          * We expect subsys->su_group.default_groups to be released
3319          * by configfs subsystem provider logic..
3320          */
3321         configfs_unregister_subsystem(&target_core_fabrics);
3322
3323         core_alua_free_lu_gp(default_lu_gp);
3324         default_lu_gp = NULL;
3325
3326         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3327                         " Infrastructure\n");
3328
3329         core_dev_release_virtual_lun0();
3330         rd_module_exit();
3331         target_xcopy_release_pt();
3332         release_se_kmem_caches();
3333 }
3334
3335 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3336 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3337 MODULE_LICENSE("GPL");
3338
3339 module_init(target_core_init_configfs);
3340 module_exit(target_core_exit_configfs);