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