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  * Copyright (c) 2008-2011 Rising Tide Systems
   7  * Copyright (c) 2008-2011 Linux-iSCSI.org
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  ****************************************************************************/
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <generated/utsrelease.h>
  27 #include <linux/utsname.h>
  28 #include <linux/init.h>
  29 #include <linux/fs.h>
  30 #include <linux/namei.h>
  31 #include <linux/slab.h>
  32 #include <linux/types.h>
  33 #include <linux/delay.h>
  34 #include <linux/unistd.h>
  35 #include <linux/string.h>
  36 #include <linux/parser.h>
  37 #include <linux/syscalls.h>
  38 #include <linux/configfs.h>
  39 #include <linux/spinlock.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_backend.h>
  43 #include <target/target_core_fabric.h>
  44 #include <target/target_core_fabric_configfs.h>
  45 #include <target/target_core_configfs.h>
  46 #include <target/configfs_macros.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_rd.h"
  52
  53 extern struct t10_alua_lu_gp *default_lu_gp;
  54
  55 static struct list_head g_tf_list;
  56 static struct mutex g_tf_lock;
  57
  58 struct target_core_configfs_attribute {
  59         struct configfs_attribute attr;
  60         ssize_t (*show)(void *, char *);
  61         ssize_t (*store)(void *, const char *, size_t);
  62 };
  63
  64 static struct config_group target_core_hbagroup;
  65 static struct config_group alua_group;
  66 static struct config_group alua_lu_gps_group;
  67
  68 static inline struct se_hba *
  69 item_to_hba(struct config_item *item)
  70 {
  71         return container_of(to_config_group(item), struct se_hba, hba_group);
  72 }
  73
  74 /*
  75  * Attributes for /sys/kernel/config/target/
  76  */
  77 static ssize_t target_core_attr_show(struct config_item *item,
  78                                       struct configfs_attribute *attr,
  79                                       char *page)
  80 {
  81         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  82                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
  83                 utsname()->sysname, utsname()->machine);
  84 }
  85
  86 static struct configfs_item_operations target_core_fabric_item_ops = {
  87         .show_attribute = target_core_attr_show,
  88 };
  89
  90 static struct configfs_attribute target_core_item_attr_version = {
  91         .ca_owner       = THIS_MODULE,
  92         .ca_name        = "version",
  93         .ca_mode        = S_IRUGO,
  94 };
  95
  96 static struct target_fabric_configfs *target_core_get_fabric(
  97         const char *name)
  98 {
  99         struct target_fabric_configfs *tf;
 100
 101         if (!name)
 102                 return NULL;
 103
 104         mutex_lock(&g_tf_lock);
 105         list_for_each_entry(tf, &g_tf_list, tf_list) {
 106                 if (!strcmp(tf->tf_name, name)) {
 107                         atomic_inc(&tf->tf_access_cnt);
 108                         mutex_unlock(&g_tf_lock);
 109                         return tf;
 110                 }
 111         }
 112         mutex_unlock(&g_tf_lock);
 113
 114         return NULL;
 115 }
 116
 117 /*
 118  * Called from struct target_core_group_ops->make_group()
 119  */
 120 static struct config_group *target_core_register_fabric(
 121         struct config_group *group,
 122         const char *name)
 123 {
 124         struct target_fabric_configfs *tf;
 125         int ret;
 126
 127         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 128                         " %s\n", group, name);
 129         /*
 130          * Below are some hardcoded request_module() calls to automatically
 131          * local fabric modules when the following is called:
 132          *
 133          * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 134          *
 135          * Note that this does not limit which TCM fabric module can be
 136          * registered, but simply provids auto loading logic for modules with
 137          * mkdir(2) system calls with known TCM fabric modules.
 138          */
 139         if (!strncmp(name, "iscsi", 5)) {
 140                 /*
 141                  * Automatically load the LIO Target fabric module when the
 142                  * following is called:
 143                  *
 144                  * mkdir -p $CONFIGFS/target/iscsi
 145                  */
 146                 ret = request_module("iscsi_target_mod");
 147                 if (ret < 0) {
 148                         pr_err("request_module() failed for"
 149                                 " iscsi_target_mod.ko: %d\n", ret);
 150                         return ERR_PTR(-EINVAL);
 151                 }
 152         } else if (!strncmp(name, "loopback", 8)) {
 153                 /*
 154                  * Automatically load the tcm_loop fabric module when the
 155                  * following is called:
 156                  *
 157                  * mkdir -p $CONFIGFS/target/loopback
 158                  */
 159                 ret = request_module("tcm_loop");
 160                 if (ret < 0) {
 161                         pr_err("request_module() failed for"
 162                                 " tcm_loop.ko: %d\n", ret);
 163                         return ERR_PTR(-EINVAL);
 164                 }
 165         }
 166
 167         tf = target_core_get_fabric(name);
 168         if (!tf) {
 169                 pr_err("target_core_get_fabric() failed for %s\n",
 170                         name);
 171                 return ERR_PTR(-EINVAL);
 172         }
 173         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 174                         " %s\n", tf->tf_name);
 175         /*
 176          * On a successful target_core_get_fabric() look, the returned
 177          * struct target_fabric_configfs *tf will contain a usage reference.
 178          */
 179         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 180                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 181
 182         tf->tf_group.default_groups = tf->tf_default_groups;
 183         tf->tf_group.default_groups[0] = &tf->tf_disc_group;
 184         tf->tf_group.default_groups[1] = NULL;
 185
 186         config_group_init_type_name(&tf->tf_group, name,
 187                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 188         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 189                         &TF_CIT_TMPL(tf)->tfc_discovery_cit);
 190
 191         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 192                         " %s\n", tf->tf_group.cg_item.ci_name);
 193         /*
 194          * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
 195          */
 196         tf->tf_ops.tf_subsys = tf->tf_subsys;
 197         tf->tf_fabric = &tf->tf_group.cg_item;
 198         pr_debug("Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
 199                         " for %s\n", name);
 200
 201         return &tf->tf_group;
 202 }
 203
 204 /*
 205  * Called from struct target_core_group_ops->drop_item()
 206  */
 207 static void target_core_deregister_fabric(
 208         struct config_group *group,
 209         struct config_item *item)
 210 {
 211         struct target_fabric_configfs *tf = container_of(
 212                 to_config_group(item), struct target_fabric_configfs, tf_group);
 213         struct config_group *tf_group;
 214         struct config_item *df_item;
 215         int i;
 216
 217         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 218                 " tf list\n", config_item_name(item));
 219
 220         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 221                         " %s\n", tf->tf_name);
 222         atomic_dec(&tf->tf_access_cnt);
 223
 224         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing"
 225                         " tf->tf_fabric for %s\n", tf->tf_name);
 226         tf->tf_fabric = NULL;
 227
 228         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 229                         " %s\n", config_item_name(item));
 230
 231         tf_group = &tf->tf_group;
 232         for (i = 0; tf_group->default_groups[i]; i++) {
 233                 df_item = &tf_group->default_groups[i]->cg_item;
 234                 tf_group->default_groups[i] = NULL;
 235                 config_item_put(df_item);
 236         }
 237         config_item_put(item);
 238 }
 239
 240 static struct configfs_group_operations target_core_fabric_group_ops = {
 241         .make_group     = &target_core_register_fabric,
 242         .drop_item      = &target_core_deregister_fabric,
 243 };
 244
 245 /*
 246  * All item attributes appearing in /sys/kernel/target/ appear here.
 247  */
 248 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 249         &target_core_item_attr_version,
 250         NULL,
 251 };
 252
 253 /*
 254  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 255  */
 256 static struct config_item_type target_core_fabrics_item = {
 257         .ct_item_ops    = &target_core_fabric_item_ops,
 258         .ct_group_ops   = &target_core_fabric_group_ops,
 259         .ct_attrs       = target_core_fabric_item_attrs,
 260         .ct_owner       = THIS_MODULE,
 261 };
 262
 263 static struct configfs_subsystem target_core_fabrics = {
 264         .su_group = {
 265                 .cg_item = {
 266                         .ci_namebuf = "target",
 267                         .ci_type = &target_core_fabrics_item,
 268                 },
 269         },
 270 };
 271
 272 static struct configfs_subsystem *target_core_subsystem[] = {
 273         &target_core_fabrics,
 274         NULL,
 275 };
 276
 277 /*##############################################################################
 278 // Start functions called by external Target Fabrics Modules
 279 //############################################################################*/
 280
 281 /*
 282  * First function called by fabric modules to:
 283  *
 284  * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
 285  * 2) Add struct target_fabric_configfs to g_tf_list
 286  * 3) Return struct target_fabric_configfs to fabric module to be passed
 287  *    into target_fabric_configfs_register().
 288  */
 289 struct target_fabric_configfs *target_fabric_configfs_init(
 290         struct module *fabric_mod,
 291         const char *name)
 292 {
 293         struct target_fabric_configfs *tf;
 294
 295         if (!(name)) {
 296                 pr_err("Unable to locate passed fabric name\n");
 297                 return ERR_PTR(-EINVAL);
 298         }
 299         if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
 300                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
 301                         "_NAME_SIZE\n", name);
 302                 return ERR_PTR(-EINVAL);
 303         }
 304
 305         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 306         if (!tf)
 307                 return ERR_PTR(-ENOMEM);
 308
 309         INIT_LIST_HEAD(&tf->tf_list);
 310         atomic_set(&tf->tf_access_cnt, 0);
 311         /*
 312          * Setup the default generic struct config_item_type's (cits) in
 313          * struct target_fabric_configfs->tf_cit_tmpl
 314          */
 315         tf->tf_module = fabric_mod;
 316         target_fabric_setup_cits(tf);
 317
 318         tf->tf_subsys = target_core_subsystem[0];
 319         snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
 320
 321         mutex_lock(&g_tf_lock);
 322         list_add_tail(&tf->tf_list, &g_tf_list);
 323         mutex_unlock(&g_tf_lock);
 324
 325         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
 326                         ">>>>>>>>>>>>>>\n");
 327         pr_debug("Initialized struct target_fabric_configfs: %p for"
 328                         " %s\n", tf, tf->tf_name);
 329         return tf;
 330 }
 331 EXPORT_SYMBOL(target_fabric_configfs_init);
 332
 333 /*
 334  * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
 335  */
 336 void target_fabric_configfs_free(
 337         struct target_fabric_configfs *tf)
 338 {
 339         mutex_lock(&g_tf_lock);
 340         list_del(&tf->tf_list);
 341         mutex_unlock(&g_tf_lock);
 342
 343         kfree(tf);
 344 }
 345 EXPORT_SYMBOL(target_fabric_configfs_free);
 346
 347 /*
 348  * Perform a sanity check of the passed tf->tf_ops before completing
 349  * TCM fabric module registration.
 350  */
 351 static int target_fabric_tf_ops_check(
 352         struct target_fabric_configfs *tf)
 353 {
 354         struct target_core_fabric_ops *tfo = &tf->tf_ops;
 355
 356         if (!tfo->get_fabric_name) {
 357                 pr_err("Missing tfo->get_fabric_name()\n");
 358                 return -EINVAL;
 359         }
 360         if (!tfo->get_fabric_proto_ident) {
 361                 pr_err("Missing tfo->get_fabric_proto_ident()\n");
 362                 return -EINVAL;
 363         }
 364         if (!tfo->tpg_get_wwn) {
 365                 pr_err("Missing tfo->tpg_get_wwn()\n");
 366                 return -EINVAL;
 367         }
 368         if (!tfo->tpg_get_tag) {
 369                 pr_err("Missing tfo->tpg_get_tag()\n");
 370                 return -EINVAL;
 371         }
 372         if (!tfo->tpg_get_default_depth) {
 373                 pr_err("Missing tfo->tpg_get_default_depth()\n");
 374                 return -EINVAL;
 375         }
 376         if (!tfo->tpg_get_pr_transport_id) {
 377                 pr_err("Missing tfo->tpg_get_pr_transport_id()\n");
 378                 return -EINVAL;
 379         }
 380         if (!tfo->tpg_get_pr_transport_id_len) {
 381                 pr_err("Missing tfo->tpg_get_pr_transport_id_len()\n");
 382                 return -EINVAL;
 383         }
 384         if (!tfo->tpg_check_demo_mode) {
 385                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
 386                 return -EINVAL;
 387         }
 388         if (!tfo->tpg_check_demo_mode_cache) {
 389                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 390                 return -EINVAL;
 391         }
 392         if (!tfo->tpg_check_demo_mode_write_protect) {
 393                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 394                 return -EINVAL;
 395         }
 396         if (!tfo->tpg_check_prod_mode_write_protect) {
 397                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 398                 return -EINVAL;
 399         }
 400         if (!tfo->tpg_alloc_fabric_acl) {
 401                 pr_err("Missing tfo->tpg_alloc_fabric_acl()\n");
 402                 return -EINVAL;
 403         }
 404         if (!tfo->tpg_release_fabric_acl) {
 405                 pr_err("Missing tfo->tpg_release_fabric_acl()\n");
 406                 return -EINVAL;
 407         }
 408         if (!tfo->tpg_get_inst_index) {
 409                 pr_err("Missing tfo->tpg_get_inst_index()\n");
 410                 return -EINVAL;
 411         }
 412         if (!tfo->release_cmd) {
 413                 pr_err("Missing tfo->release_cmd()\n");
 414                 return -EINVAL;
 415         }
 416         if (!tfo->shutdown_session) {
 417                 pr_err("Missing tfo->shutdown_session()\n");
 418                 return -EINVAL;
 419         }
 420         if (!tfo->close_session) {
 421                 pr_err("Missing tfo->close_session()\n");
 422                 return -EINVAL;
 423         }
 424         if (!tfo->stop_session) {
 425                 pr_err("Missing tfo->stop_session()\n");
 426                 return -EINVAL;
 427         }
 428         if (!tfo->fall_back_to_erl0) {
 429                 pr_err("Missing tfo->fall_back_to_erl0()\n");
 430                 return -EINVAL;
 431         }
 432         if (!tfo->sess_logged_in) {
 433                 pr_err("Missing tfo->sess_logged_in()\n");
 434                 return -EINVAL;
 435         }
 436         if (!tfo->sess_get_index) {
 437                 pr_err("Missing tfo->sess_get_index()\n");
 438                 return -EINVAL;
 439         }
 440         if (!tfo->write_pending) {
 441                 pr_err("Missing tfo->write_pending()\n");
 442                 return -EINVAL;
 443         }
 444         if (!tfo->write_pending_status) {
 445                 pr_err("Missing tfo->write_pending_status()\n");
 446                 return -EINVAL;
 447         }
 448         if (!tfo->set_default_node_attributes) {
 449                 pr_err("Missing tfo->set_default_node_attributes()\n");
 450                 return -EINVAL;
 451         }
 452         if (!tfo->get_task_tag) {
 453                 pr_err("Missing tfo->get_task_tag()\n");
 454                 return -EINVAL;
 455         }
 456         if (!tfo->get_cmd_state) {
 457                 pr_err("Missing tfo->get_cmd_state()\n");
 458                 return -EINVAL;
 459         }
 460         if (!tfo->queue_data_in) {
 461                 pr_err("Missing tfo->queue_data_in()\n");
 462                 return -EINVAL;
 463         }
 464         if (!tfo->queue_status) {
 465                 pr_err("Missing tfo->queue_status()\n");
 466                 return -EINVAL;
 467         }
 468         if (!tfo->queue_tm_rsp) {
 469                 pr_err("Missing tfo->queue_tm_rsp()\n");
 470                 return -EINVAL;
 471         }
 472         if (!tfo->set_fabric_sense_len) {
 473                 pr_err("Missing tfo->set_fabric_sense_len()\n");
 474                 return -EINVAL;
 475         }
 476         if (!tfo->get_fabric_sense_len) {
 477                 pr_err("Missing tfo->get_fabric_sense_len()\n");
 478                 return -EINVAL;
 479         }
 480         if (!tfo->is_state_remove) {
 481                 pr_err("Missing tfo->is_state_remove()\n");
 482                 return -EINVAL;
 483         }
 484         /*
 485          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 486          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 487          * target_core_fabric_configfs.c WWN+TPG group context code.
 488          */
 489         if (!tfo->fabric_make_wwn) {
 490                 pr_err("Missing tfo->fabric_make_wwn()\n");
 491                 return -EINVAL;
 492         }
 493         if (!tfo->fabric_drop_wwn) {
 494                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 495                 return -EINVAL;
 496         }
 497         if (!tfo->fabric_make_tpg) {
 498                 pr_err("Missing tfo->fabric_make_tpg()\n");
 499                 return -EINVAL;
 500         }
 501         if (!tfo->fabric_drop_tpg) {
 502                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 503                 return -EINVAL;
 504         }
 505
 506         return 0;
 507 }
 508
 509 /*
 510  * Called 2nd from fabric module with returned parameter of
 511  * struct target_fabric_configfs * from target_fabric_configfs_init().
 512  *
 513  * Upon a successful registration, the new fabric's struct config_item is
 514  * return.  Also, a pointer to this struct is set in the passed
 515  * struct target_fabric_configfs.
 516  */
 517 int target_fabric_configfs_register(
 518         struct target_fabric_configfs *tf)
 519 {
 520         int ret;
 521
 522         if (!tf) {
 523                 pr_err("Unable to locate target_fabric_configfs"
 524                         " pointer\n");
 525                 return -EINVAL;
 526         }
 527         if (!tf->tf_subsys) {
 528                 pr_err("Unable to target struct config_subsystem"
 529                         " pointer\n");
 530                 return -EINVAL;
 531         }
 532         ret = target_fabric_tf_ops_check(tf);
 533         if (ret < 0)
 534                 return ret;
 535
 536         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
 537                 ">>>>>>>>>>\n");
 538         return 0;
 539 }
 540 EXPORT_SYMBOL(target_fabric_configfs_register);
 541
 542 void target_fabric_configfs_deregister(
 543         struct target_fabric_configfs *tf)
 544 {
 545         struct configfs_subsystem *su;
 546
 547         if (!tf) {
 548                 pr_err("Unable to locate passed target_fabric_"
 549                         "configfs\n");
 550                 return;
 551         }
 552         su = tf->tf_subsys;
 553         if (!su) {
 554                 pr_err("Unable to locate passed tf->tf_subsys"
 555                         " pointer\n");
 556                 return;
 557         }
 558         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
 559                         ">>>>>>>>>>>>\n");
 560         mutex_lock(&g_tf_lock);
 561         if (atomic_read(&tf->tf_access_cnt)) {
 562                 mutex_unlock(&g_tf_lock);
 563                 pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
 564                         tf->tf_name);
 565                 BUG();
 566         }
 567         list_del(&tf->tf_list);
 568         mutex_unlock(&g_tf_lock);
 569
 570         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
 571                         " %s\n", tf->tf_name);
 572         tf->tf_module = NULL;
 573         tf->tf_subsys = NULL;
 574         kfree(tf);
 575
 576         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
 577                         ">>>>>\n");
 578 }
 579 EXPORT_SYMBOL(target_fabric_configfs_deregister);
 580
 581 /*##############################################################################
 582 // Stop functions called by external Target Fabrics Modules
 583 //############################################################################*/
 584
 585 /* Start functions for struct config_item_type target_core_dev_attrib_cit */
 586
 587 #define DEF_DEV_ATTRIB_SHOW(_name)                                      \
 588 static ssize_t target_core_dev_show_attr_##_name(                       \
 589         struct se_dev_attrib *da,                                       \
 590         char *page)                                                     \
 591 {                                                                       \
 592         struct se_device *dev;                                          \
 593         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 594         ssize_t rb;                                                     \
 595                                                                         \
 596         spin_lock(&se_dev->se_dev_lock);                                \
 597         dev = se_dev->se_dev_ptr;                                       \
 598         if (!dev) {                                                     \
 599                 spin_unlock(&se_dev->se_dev_lock);                      \
 600                 return -ENODEV;                                         \
 601         }                                                               \
 602         rb = snprintf(page, PAGE_SIZE, "%u\n",                          \
 603                 (u32)dev->se_sub_dev->se_dev_attrib._name);             \
 604         spin_unlock(&se_dev->se_dev_lock);                              \
 605                                                                         \
 606         return rb;                                                      \
 607 }
 608
 609 #define DEF_DEV_ATTRIB_STORE(_name)                                     \
 610 static ssize_t target_core_dev_store_attr_##_name(                      \
 611         struct se_dev_attrib *da,                                       \
 612         const char *page,                                               \
 613         size_t count)                                                   \
 614 {                                                                       \
 615         struct se_device *dev;                                          \
 616         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 617         unsigned long val;                                              \
 618         int ret;                                                        \
 619                                                                         \
 620         spin_lock(&se_dev->se_dev_lock);                                \
 621         dev = se_dev->se_dev_ptr;                                       \
 622         if (!dev) {                                                     \
 623                 spin_unlock(&se_dev->se_dev_lock);                      \
 624                 return -ENODEV;                                         \
 625         }                                                               \
 626         ret = strict_strtoul(page, 0, &val);                            \
 627         if (ret < 0) {                                                  \
 628                 spin_unlock(&se_dev->se_dev_lock);                      \
 629                 pr_err("strict_strtoul() failed with"           \
 630                         " ret: %d\n", ret);                             \
 631                 return -EINVAL;                                         \
 632         }                                                               \
 633         ret = se_dev_set_##_name(dev, (u32)val);                        \
 634         spin_unlock(&se_dev->se_dev_lock);                              \
 635                                                                         \
 636         return (!ret) ? count : -EINVAL;                                \
 637 }
 638
 639 #define DEF_DEV_ATTRIB(_name)                                           \
 640 DEF_DEV_ATTRIB_SHOW(_name);                                             \
 641 DEF_DEV_ATTRIB_STORE(_name);
 642
 643 #define DEF_DEV_ATTRIB_RO(_name)                                        \
 644 DEF_DEV_ATTRIB_SHOW(_name);
 645
 646 CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
 647 #define SE_DEV_ATTR(_name, _mode)                                       \
 648 static struct target_core_dev_attrib_attribute                          \
 649                         target_core_dev_attrib_##_name =                \
 650                 __CONFIGFS_EATTR(_name, _mode,                          \
 651                 target_core_dev_show_attr_##_name,                      \
 652                 target_core_dev_store_attr_##_name);
 653
 654 #define SE_DEV_ATTR_RO(_name);                                          \
 655 static struct target_core_dev_attrib_attribute                          \
 656                         target_core_dev_attrib_##_name =                \
 657         __CONFIGFS_EATTR_RO(_name,                                      \
 658         target_core_dev_show_attr_##_name);
 659
 660 DEF_DEV_ATTRIB(emulate_dpo);
 661 SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
 662
 663 DEF_DEV_ATTRIB(emulate_fua_write);
 664 SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);
 665
 666 DEF_DEV_ATTRIB(emulate_fua_read);
 667 SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);
 668
 669 DEF_DEV_ATTRIB(emulate_write_cache);
 670 SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);
 671
 672 DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
 673 SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
 674
 675 DEF_DEV_ATTRIB(emulate_tas);
 676 SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
 677
 678 DEF_DEV_ATTRIB(emulate_tpu);
 679 SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
 680
 681 DEF_DEV_ATTRIB(emulate_tpws);
 682 SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
 683
 684 DEF_DEV_ATTRIB(enforce_pr_isids);
 685 SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
 686
 687 DEF_DEV_ATTRIB(is_nonrot);
 688 SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
 689
 690 DEF_DEV_ATTRIB(emulate_rest_reord);
 691 SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);
 692
 693 DEF_DEV_ATTRIB_RO(hw_block_size);
 694 SE_DEV_ATTR_RO(hw_block_size);
 695
 696 DEF_DEV_ATTRIB(block_size);
 697 SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
 698
 699 DEF_DEV_ATTRIB_RO(hw_max_sectors);
 700 SE_DEV_ATTR_RO(hw_max_sectors);
 701
 702 DEF_DEV_ATTRIB(max_sectors);
 703 SE_DEV_ATTR(max_sectors, S_IRUGO | S_IWUSR);
 704
 705 DEF_DEV_ATTRIB(optimal_sectors);
 706 SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);
 707
 708 DEF_DEV_ATTRIB_RO(hw_queue_depth);
 709 SE_DEV_ATTR_RO(hw_queue_depth);
 710
 711 DEF_DEV_ATTRIB(queue_depth);
 712 SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
 713
 714 DEF_DEV_ATTRIB(max_unmap_lba_count);
 715 SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
 716
 717 DEF_DEV_ATTRIB(max_unmap_block_desc_count);
 718 SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);
 719
 720 DEF_DEV_ATTRIB(unmap_granularity);
 721 SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
 722
 723 DEF_DEV_ATTRIB(unmap_granularity_alignment);
 724 SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
 725
 726 CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
 727
 728 static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
 729         &target_core_dev_attrib_emulate_dpo.attr,
 730         &target_core_dev_attrib_emulate_fua_write.attr,
 731         &target_core_dev_attrib_emulate_fua_read.attr,
 732         &target_core_dev_attrib_emulate_write_cache.attr,
 733         &target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
 734         &target_core_dev_attrib_emulate_tas.attr,
 735         &target_core_dev_attrib_emulate_tpu.attr,
 736         &target_core_dev_attrib_emulate_tpws.attr,
 737         &target_core_dev_attrib_enforce_pr_isids.attr,
 738         &target_core_dev_attrib_is_nonrot.attr,
 739         &target_core_dev_attrib_emulate_rest_reord.attr,
 740         &target_core_dev_attrib_hw_block_size.attr,
 741         &target_core_dev_attrib_block_size.attr,
 742         &target_core_dev_attrib_hw_max_sectors.attr,
 743         &target_core_dev_attrib_max_sectors.attr,
 744         &target_core_dev_attrib_optimal_sectors.attr,
 745         &target_core_dev_attrib_hw_queue_depth.attr,
 746         &target_core_dev_attrib_queue_depth.attr,
 747         &target_core_dev_attrib_max_unmap_lba_count.attr,
 748         &target_core_dev_attrib_max_unmap_block_desc_count.attr,
 749         &target_core_dev_attrib_unmap_granularity.attr,
 750         &target_core_dev_attrib_unmap_granularity_alignment.attr,
 751         NULL,
 752 };
 753
 754 static struct configfs_item_operations target_core_dev_attrib_ops = {
 755         .show_attribute         = target_core_dev_attrib_attr_show,
 756         .store_attribute        = target_core_dev_attrib_attr_store,
 757 };
 758
 759 static struct config_item_type target_core_dev_attrib_cit = {
 760         .ct_item_ops            = &target_core_dev_attrib_ops,
 761         .ct_attrs               = target_core_dev_attrib_attrs,
 762         .ct_owner               = THIS_MODULE,
 763 };
 764
 765 /* End functions for struct config_item_type target_core_dev_attrib_cit */
 766
 767 /*  Start functions for struct config_item_type target_core_dev_wwn_cit */
 768
 769 CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
 770 #define SE_DEV_WWN_ATTR(_name, _mode)                                   \
 771 static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
 772                 __CONFIGFS_EATTR(_name, _mode,                          \
 773                 target_core_dev_wwn_show_attr_##_name,                  \
 774                 target_core_dev_wwn_store_attr_##_name);
 775
 776 #define SE_DEV_WWN_ATTR_RO(_name);                                      \
 777 do {                                                                    \
 778         static struct target_core_dev_wwn_attribute                     \
 779                         target_core_dev_wwn_##_name =                   \
 780                 __CONFIGFS_EATTR_RO(_name,                              \
 781                 target_core_dev_wwn_show_attr_##_name);                 \
 782 } while (0);
 783
 784 /*
 785  * VPD page 0x80 Unit serial
 786  */
 787 static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
 788         struct t10_wwn *t10_wwn,
 789         char *page)
 790 {
 791         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 792         struct se_device *dev;
 793
 794         dev = se_dev->se_dev_ptr;
 795         if (!dev)
 796                 return -ENODEV;
 797
 798         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
 799                 &t10_wwn->unit_serial[0]);
 800 }
 801
 802 static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
 803         struct t10_wwn *t10_wwn,
 804         const char *page,
 805         size_t count)
 806 {
 807         struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
 808         struct se_device *dev;
 809         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
 810
 811         /*
 812          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
 813          * from the struct scsi_device level firmware, do not allow
 814          * VPD Unit Serial to be emulated.
 815          *
 816          * Note this struct scsi_device could also be emulating VPD
 817          * information from its drivers/scsi LLD.  But for now we assume
 818          * it is doing 'the right thing' wrt a world wide unique
 819          * VPD Unit Serial Number that OS dependent multipath can depend on.
 820          */
 821         if (su_dev->su_dev_flags & SDF_FIRMWARE_VPD_UNIT_SERIAL) {
 822                 pr_err("Underlying SCSI device firmware provided VPD"
 823                         " Unit Serial, ignoring request\n");
 824                 return -EOPNOTSUPP;
 825         }
 826
 827         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
 828                 pr_err("Emulated VPD Unit Serial exceeds"
 829                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
 830                 return -EOVERFLOW;
 831         }
 832         /*
 833          * Check to see if any active $FABRIC_MOD exports exist.  If they
 834          * do exist, fail here as changing this information on the fly
 835          * (underneath the initiator side OS dependent multipath code)
 836          * could cause negative effects.
 837          */
 838         dev = su_dev->se_dev_ptr;
 839         if (dev) {
 840                 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
 841                         pr_err("Unable to set VPD Unit Serial while"
 842                                 " active %d $FABRIC_MOD exports exist\n",
 843                                 atomic_read(&dev->dev_export_obj.obj_access_count));
 844                         return -EINVAL;
 845                 }
 846         }
 847         /*
 848          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
 849          *
 850          * Also, strip any newline added from the userspace
 851          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
 852          */
 853         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
 854         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
 855         snprintf(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
 856                         "%s", strstrip(buf));
 857         su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;
 858
 859         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
 860                         " %s\n", su_dev->t10_wwn.unit_serial);
 861
 862         return count;
 863 }
 864
 865 SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);
 866
 867 /*
 868  * VPD page 0x83 Protocol Identifier
 869  */
 870 static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
 871         struct t10_wwn *t10_wwn,
 872         char *page)
 873 {
 874         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 875         struct se_device *dev;
 876         struct t10_vpd *vpd;
 877         unsigned char buf[VPD_TMP_BUF_SIZE];
 878         ssize_t len = 0;
 879
 880         dev = se_dev->se_dev_ptr;
 881         if (!dev)
 882                 return -ENODEV;
 883
 884         memset(buf, 0, VPD_TMP_BUF_SIZE);
 885
 886         spin_lock(&t10_wwn->t10_vpd_lock);
 887         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
 888                 if (!vpd->protocol_identifier_set)
 889                         continue;
 890
 891                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
 892
 893                 if (len + strlen(buf) >= PAGE_SIZE)
 894                         break;
 895
 896                 len += sprintf(page+len, "%s", buf);
 897         }
 898         spin_unlock(&t10_wwn->t10_vpd_lock);
 899
 900         return len;
 901 }
 902
 903 static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
 904         struct t10_wwn *t10_wwn,
 905         const char *page,
 906         size_t count)
 907 {
 908         return -ENOSYS;
 909 }
 910
 911 SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);
 912
 913 /*
 914  * Generic wrapper for dumping VPD identifiers by association.
 915  */
 916 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
 917 static ssize_t target_core_dev_wwn_show_attr_##_name(                   \
 918         struct t10_wwn *t10_wwn,                                        \
 919         char *page)                                                     \
 920 {                                                                       \
 921         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;         \
 922         struct se_device *dev;                                          \
 923         struct t10_vpd *vpd;                                                    \
 924         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
 925         ssize_t len = 0;                                                \
 926                                                                         \
 927         dev = se_dev->se_dev_ptr;                                       \
 928         if (!dev)                                                       \
 929                 return -ENODEV;                                         \
 930                                                                         \
 931         spin_lock(&t10_wwn->t10_vpd_lock);                              \
 932         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
 933                 if (vpd->association != _assoc)                         \
 934                         continue;                                       \
 935                                                                         \
 936                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 937                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
 938                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 939                         break;                                          \
 940                 len += sprintf(page+len, "%s", buf);                    \
 941                                                                         \
 942                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 943                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
 944                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 945                         break;                                          \
 946                 len += sprintf(page+len, "%s", buf);                    \
 947                                                                         \
 948                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 949                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
 950                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 951                         break;                                          \
 952                 len += sprintf(page+len, "%s", buf);                    \
 953         }                                                               \
 954         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
 955                                                                         \
 956         return len;                                                     \
 957 }
 958
 959 /*
 960  * VPD page 0x83 Association: Logical Unit
 961  */
 962 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
 963
 964 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
 965         struct t10_wwn *t10_wwn,
 966         const char *page,
 967         size_t count)
 968 {
 969         return -ENOSYS;
 970 }
 971
 972 SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);
 973
 974 /*
 975  * VPD page 0x83 Association: Target Port
 976  */
 977 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
 978
 979 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
 980         struct t10_wwn *t10_wwn,
 981         const char *page,
 982         size_t count)
 983 {
 984         return -ENOSYS;
 985 }
 986
 987 SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);
 988
 989 /*
 990  * VPD page 0x83 Association: SCSI Target Device
 991  */
 992 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
 993
 994 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
 995         struct t10_wwn *t10_wwn,
 996         const char *page,
 997         size_t count)
 998 {
 999         return -ENOSYS;
1000 }
1001
1002 SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);
1003
1004 CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);
1005
1006 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1007         &target_core_dev_wwn_vpd_unit_serial.attr,
1008         &target_core_dev_wwn_vpd_protocol_identifier.attr,
1009         &target_core_dev_wwn_vpd_assoc_logical_unit.attr,
1010         &target_core_dev_wwn_vpd_assoc_target_port.attr,
1011         &target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
1012         NULL,
1013 };
1014
1015 static struct configfs_item_operations target_core_dev_wwn_ops = {
1016         .show_attribute         = target_core_dev_wwn_attr_show,
1017         .store_attribute        = target_core_dev_wwn_attr_store,
1018 };
1019
1020 static struct config_item_type target_core_dev_wwn_cit = {
1021         .ct_item_ops            = &target_core_dev_wwn_ops,
1022         .ct_attrs               = target_core_dev_wwn_attrs,
1023         .ct_owner               = THIS_MODULE,
1024 };
1025
1026 /*  End functions for struct config_item_type target_core_dev_wwn_cit */
1027
1028 /*  Start functions for struct config_item_type target_core_dev_pr_cit */
1029
1030 CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_subsystem_dev);
1031 #define SE_DEV_PR_ATTR(_name, _mode)                                    \
1032 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1033         __CONFIGFS_EATTR(_name, _mode,                                  \
1034         target_core_dev_pr_show_attr_##_name,                           \
1035         target_core_dev_pr_store_attr_##_name);
1036
1037 #define SE_DEV_PR_ATTR_RO(_name);                                       \
1038 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1039         __CONFIGFS_EATTR_RO(_name,                                      \
1040         target_core_dev_pr_show_attr_##_name);
1041
1042 /*
1043  * res_holder
1044  */
1045 static ssize_t target_core_dev_pr_show_spc3_res(
1046         struct se_device *dev,
1047         char *page,
1048         ssize_t *len)
1049 {
1050         struct se_node_acl *se_nacl;
1051         struct t10_pr_registration *pr_reg;
1052         char i_buf[PR_REG_ISID_ID_LEN];
1053         int prf_isid;
1054
1055         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1056
1057         spin_lock(&dev->dev_reservation_lock);
1058         pr_reg = dev->dev_pr_res_holder;
1059         if (!pr_reg) {
1060                 *len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
1061                 spin_unlock(&dev->dev_reservation_lock);
1062                 return *len;
1063         }
1064         se_nacl = pr_reg->pr_reg_nacl;
1065         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1066                                 PR_REG_ISID_ID_LEN);
1067
1068         *len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
1069                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1070                 se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
1071         spin_unlock(&dev->dev_reservation_lock);
1072
1073         return *len;
1074 }
1075
1076 static ssize_t target_core_dev_pr_show_spc2_res(
1077         struct se_device *dev,
1078         char *page,
1079         ssize_t *len)
1080 {
1081         struct se_node_acl *se_nacl;
1082
1083         spin_lock(&dev->dev_reservation_lock);
1084         se_nacl = dev->dev_reserved_node_acl;
1085         if (!se_nacl) {
1086                 *len += sprintf(page + *len, "No SPC-2 Reservation holder\n");
1087                 spin_unlock(&dev->dev_reservation_lock);
1088                 return *len;
1089         }
1090         *len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",
1091                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1092                 se_nacl->initiatorname);
1093         spin_unlock(&dev->dev_reservation_lock);
1094
1095         return *len;
1096 }
1097
1098 static ssize_t target_core_dev_pr_show_attr_res_holder(
1099         struct se_subsystem_dev *su_dev,
1100         char *page)
1101 {
1102         ssize_t len = 0;
1103
1104         if (!su_dev->se_dev_ptr)
1105                 return -ENODEV;
1106
1107         switch (su_dev->t10_pr.res_type) {
1108         case SPC3_PERSISTENT_RESERVATIONS:
1109                 target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
1110                                 page, &len);
1111                 break;
1112         case SPC2_RESERVATIONS:
1113                 target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
1114                                 page, &len);
1115                 break;
1116         case SPC_PASSTHROUGH:
1117                 len += sprintf(page+len, "Passthrough\n");
1118                 break;
1119         default:
1120                 len += sprintf(page+len, "Unknown\n");
1121                 break;
1122         }
1123
1124         return len;
1125 }
1126
1127 SE_DEV_PR_ATTR_RO(res_holder);
1128
1129 /*
1130  * res_pr_all_tgt_pts
1131  */
1132 static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
1133         struct se_subsystem_dev *su_dev,
1134         char *page)
1135 {
1136         struct se_device *dev;
1137         struct t10_pr_registration *pr_reg;
1138         ssize_t len = 0;
1139
1140         dev = su_dev->se_dev_ptr;
1141         if (!dev)
1142                 return -ENODEV;
1143
1144         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1145                 return len;
1146
1147         spin_lock(&dev->dev_reservation_lock);
1148         pr_reg = dev->dev_pr_res_holder;
1149         if (!pr_reg) {
1150                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1151                 spin_unlock(&dev->dev_reservation_lock);
1152                 return len;
1153         }
1154         /*
1155          * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
1156          * Basic PERSISTENT RESERVER OUT parameter list, page 290
1157          */
1158         if (pr_reg->pr_reg_all_tg_pt)
1159                 len = sprintf(page, "SPC-3 Reservation: All Target"
1160                         " Ports registration\n");
1161         else
1162                 len = sprintf(page, "SPC-3 Reservation: Single"
1163                         " Target Port registration\n");
1164         spin_unlock(&dev->dev_reservation_lock);
1165
1166         return len;
1167 }
1168
1169 SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);
1170
1171 /*
1172  * res_pr_generation
1173  */
1174 static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
1175         struct se_subsystem_dev *su_dev,
1176         char *page)
1177 {
1178         if (!su_dev->se_dev_ptr)
1179                 return -ENODEV;
1180
1181         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1182                 return 0;
1183
1184         return sprintf(page, "0x%08x\n", su_dev->t10_pr.pr_generation);
1185 }
1186
1187 SE_DEV_PR_ATTR_RO(res_pr_generation);
1188
1189 /*
1190  * res_pr_holder_tg_port
1191  */
1192 static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
1193         struct se_subsystem_dev *su_dev,
1194         char *page)
1195 {
1196         struct se_device *dev;
1197         struct se_node_acl *se_nacl;
1198         struct se_lun *lun;
1199         struct se_portal_group *se_tpg;
1200         struct t10_pr_registration *pr_reg;
1201         struct target_core_fabric_ops *tfo;
1202         ssize_t len = 0;
1203
1204         dev = su_dev->se_dev_ptr;
1205         if (!dev)
1206                 return -ENODEV;
1207
1208         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1209                 return len;
1210
1211         spin_lock(&dev->dev_reservation_lock);
1212         pr_reg = dev->dev_pr_res_holder;
1213         if (!pr_reg) {
1214                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1215                 spin_unlock(&dev->dev_reservation_lock);
1216                 return len;
1217         }
1218         se_nacl = pr_reg->pr_reg_nacl;
1219         se_tpg = se_nacl->se_tpg;
1220         lun = pr_reg->pr_reg_tg_pt_lun;
1221         tfo = se_tpg->se_tpg_tfo;
1222
1223         len += sprintf(page+len, "SPC-3 Reservation: %s"
1224                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1225                 tfo->tpg_get_wwn(se_tpg));
1226         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1227                 " Identifer Tag: %hu %s Portal Group Tag: %hu"
1228                 " %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
1229                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1230                 tfo->get_fabric_name(), lun->unpacked_lun);
1231         spin_unlock(&dev->dev_reservation_lock);
1232
1233         return len;
1234 }
1235
1236 SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);
1237
1238 /*
1239  * res_pr_registered_i_pts
1240  */
1241 static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
1242         struct se_subsystem_dev *su_dev,
1243         char *page)
1244 {
1245         struct target_core_fabric_ops *tfo;
1246         struct t10_pr_registration *pr_reg;
1247         unsigned char buf[384];
1248         char i_buf[PR_REG_ISID_ID_LEN];
1249         ssize_t len = 0;
1250         int reg_count = 0, prf_isid;
1251
1252         if (!su_dev->se_dev_ptr)
1253                 return -ENODEV;
1254
1255         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1256                 return len;
1257
1258         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1259
1260         spin_lock(&su_dev->t10_pr.registration_lock);
1261         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1262                         pr_reg_list) {
1263
1264                 memset(buf, 0, 384);
1265                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1266                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1267                 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1268                                         PR_REG_ISID_ID_LEN);
1269                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1270                         tfo->get_fabric_name(),
1271                         pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
1272                         &i_buf[0] : "", pr_reg->pr_res_key,
1273                         pr_reg->pr_res_generation);
1274
1275                 if (len + strlen(buf) >= PAGE_SIZE)
1276                         break;
1277
1278                 len += sprintf(page+len, "%s", buf);
1279                 reg_count++;
1280         }
1281         spin_unlock(&su_dev->t10_pr.registration_lock);
1282
1283         if (!reg_count)
1284                 len += sprintf(page+len, "None\n");
1285
1286         return len;
1287 }
1288
1289 SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);
1290
1291 /*
1292  * res_pr_type
1293  */
1294 static ssize_t target_core_dev_pr_show_attr_res_pr_type(
1295         struct se_subsystem_dev *su_dev,
1296         char *page)
1297 {
1298         struct se_device *dev;
1299         struct t10_pr_registration *pr_reg;
1300         ssize_t len = 0;
1301
1302         dev = su_dev->se_dev_ptr;
1303         if (!dev)
1304                 return -ENODEV;
1305
1306         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1307                 return len;
1308
1309         spin_lock(&dev->dev_reservation_lock);
1310         pr_reg = dev->dev_pr_res_holder;
1311         if (!pr_reg) {
1312                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1313                 spin_unlock(&dev->dev_reservation_lock);
1314                 return len;
1315         }
1316         len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1317                 core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1318         spin_unlock(&dev->dev_reservation_lock);
1319
1320         return len;
1321 }
1322
1323 SE_DEV_PR_ATTR_RO(res_pr_type);
1324
1325 /*
1326  * res_type
1327  */
1328 static ssize_t target_core_dev_pr_show_attr_res_type(
1329         struct se_subsystem_dev *su_dev,
1330         char *page)
1331 {
1332         ssize_t len = 0;
1333
1334         if (!su_dev->se_dev_ptr)
1335                 return -ENODEV;
1336
1337         switch (su_dev->t10_pr.res_type) {
1338         case SPC3_PERSISTENT_RESERVATIONS:
1339                 len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1340                 break;
1341         case SPC2_RESERVATIONS:
1342                 len = sprintf(page, "SPC2_RESERVATIONS\n");
1343                 break;
1344         case SPC_PASSTHROUGH:
1345                 len = sprintf(page, "SPC_PASSTHROUGH\n");
1346                 break;
1347         default:
1348                 len = sprintf(page, "UNKNOWN\n");
1349                 break;
1350         }
1351
1352         return len;
1353 }
1354
1355 SE_DEV_PR_ATTR_RO(res_type);
1356
1357 /*
1358  * res_aptpl_active
1359  */
1360
1361 static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
1362         struct se_subsystem_dev *su_dev,
1363         char *page)
1364 {
1365         if (!su_dev->se_dev_ptr)
1366                 return -ENODEV;
1367
1368         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1369                 return 0;
1370
1371         return sprintf(page, "APTPL Bit Status: %s\n",
1372                 (su_dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1373 }
1374
1375 SE_DEV_PR_ATTR_RO(res_aptpl_active);
1376
1377 /*
1378  * res_aptpl_metadata
1379  */
1380 static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
1381         struct se_subsystem_dev *su_dev,
1382         char *page)
1383 {
1384         if (!su_dev->se_dev_ptr)
1385                 return -ENODEV;
1386
1387         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1388                 return 0;
1389
1390         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1391 }
1392
1393 enum {
1394         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1395         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1396         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1397         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1398 };
1399
1400 static match_table_t tokens = {
1401         {Opt_initiator_fabric, "initiator_fabric=%s"},
1402         {Opt_initiator_node, "initiator_node=%s"},
1403         {Opt_initiator_sid, "initiator_sid=%s"},
1404         {Opt_sa_res_key, "sa_res_key=%s"},
1405         {Opt_res_holder, "res_holder=%d"},
1406         {Opt_res_type, "res_type=%d"},
1407         {Opt_res_scope, "res_scope=%d"},
1408         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1409         {Opt_mapped_lun, "mapped_lun=%d"},
1410         {Opt_target_fabric, "target_fabric=%s"},
1411         {Opt_target_node, "target_node=%s"},
1412         {Opt_tpgt, "tpgt=%d"},
1413         {Opt_port_rtpi, "port_rtpi=%d"},
1414         {Opt_target_lun, "target_lun=%d"},
1415         {Opt_err, NULL}
1416 };
1417
1418 static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
1419         struct se_subsystem_dev *su_dev,
1420         const char *page,
1421         size_t count)
1422 {
1423         struct se_device *dev;
1424         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1425         unsigned char *t_fabric = NULL, *t_port = NULL;
1426         char *orig, *ptr, *arg_p, *opts;
1427         substring_t args[MAX_OPT_ARGS];
1428         unsigned long long tmp_ll;
1429         u64 sa_res_key = 0;
1430         u32 mapped_lun = 0, target_lun = 0;
1431         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1432         u16 port_rpti = 0, tpgt = 0;
1433         u8 type = 0, scope;
1434
1435         dev = su_dev->se_dev_ptr;
1436         if (!dev)
1437                 return -ENODEV;
1438
1439         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1440                 return 0;
1441
1442         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1443                 pr_debug("Unable to process APTPL metadata while"
1444                         " active fabric exports exist\n");
1445                 return -EINVAL;
1446         }
1447
1448         opts = kstrdup(page, GFP_KERNEL);
1449         if (!opts)
1450                 return -ENOMEM;
1451
1452         orig = opts;
1453         while ((ptr = strsep(&opts, ",\n")) != NULL) {
1454                 if (!*ptr)
1455                         continue;
1456
1457                 token = match_token(ptr, tokens, args);
1458                 switch (token) {
1459                 case Opt_initiator_fabric:
1460                         i_fabric = match_strdup(&args[0]);
1461                         if (!i_fabric) {
1462                                 ret = -ENOMEM;
1463                                 goto out;
1464                         }
1465                         break;
1466                 case Opt_initiator_node:
1467                         i_port = match_strdup(&args[0]);
1468                         if (!i_port) {
1469                                 ret = -ENOMEM;
1470                                 goto out;
1471                         }
1472                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1473                                 pr_err("APTPL metadata initiator_node="
1474                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1475                                         PR_APTPL_MAX_IPORT_LEN);
1476                                 ret = -EINVAL;
1477                                 break;
1478                         }
1479                         break;
1480                 case Opt_initiator_sid:
1481                         isid = match_strdup(&args[0]);
1482                         if (!isid) {
1483                                 ret = -ENOMEM;
1484                                 goto out;
1485                         }
1486                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1487                                 pr_err("APTPL metadata initiator_isid"
1488                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1489                                         PR_REG_ISID_LEN);
1490                                 ret = -EINVAL;
1491                                 break;
1492                         }
1493                         break;
1494                 case Opt_sa_res_key:
1495                         arg_p = match_strdup(&args[0]);
1496                         if (!arg_p) {
1497                                 ret = -ENOMEM;
1498                                 goto out;
1499                         }
1500                         ret = strict_strtoull(arg_p, 0, &tmp_ll);
1501                         if (ret < 0) {
1502                                 pr_err("strict_strtoull() failed for"
1503                                         " sa_res_key=\n");
1504                                 goto out;
1505                         }
1506                         sa_res_key = (u64)tmp_ll;
1507                         break;
1508                 /*
1509                  * PR APTPL Metadata for Reservation
1510                  */
1511                 case Opt_res_holder:
1512                         match_int(args, &arg);
1513                         res_holder = arg;
1514                         break;
1515                 case Opt_res_type:
1516                         match_int(args, &arg);
1517                         type = (u8)arg;
1518                         break;
1519                 case Opt_res_scope:
1520                         match_int(args, &arg);
1521                         scope = (u8)arg;
1522                         break;
1523                 case Opt_res_all_tg_pt:
1524                         match_int(args, &arg);
1525                         all_tg_pt = (int)arg;
1526                         break;
1527                 case Opt_mapped_lun:
1528                         match_int(args, &arg);
1529                         mapped_lun = (u32)arg;
1530                         break;
1531                 /*
1532                  * PR APTPL Metadata for Target Port
1533                  */
1534                 case Opt_target_fabric:
1535                         t_fabric = match_strdup(&args[0]);
1536                         if (!t_fabric) {
1537                                 ret = -ENOMEM;
1538                                 goto out;
1539                         }
1540                         break;
1541                 case Opt_target_node:
1542                         t_port = match_strdup(&args[0]);
1543                         if (!t_port) {
1544                                 ret = -ENOMEM;
1545                                 goto out;
1546                         }
1547                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1548                                 pr_err("APTPL metadata target_node="
1549                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1550                                         PR_APTPL_MAX_TPORT_LEN);
1551                                 ret = -EINVAL;
1552                                 break;
1553                         }
1554                         break;
1555                 case Opt_tpgt:
1556                         match_int(args, &arg);
1557                         tpgt = (u16)arg;
1558                         break;
1559                 case Opt_port_rtpi:
1560                         match_int(args, &arg);
1561                         port_rpti = (u16)arg;
1562                         break;
1563                 case Opt_target_lun:
1564                         match_int(args, &arg);
1565                         target_lun = (u32)arg;
1566                         break;
1567                 default:
1568                         break;
1569                 }
1570         }
1571
1572         if (!i_port || !t_port || !sa_res_key) {
1573                 pr_err("Illegal parameters for APTPL registration\n");
1574                 ret = -EINVAL;
1575                 goto out;
1576         }
1577
1578         if (res_holder && !(type)) {
1579                 pr_err("Illegal PR type: 0x%02x for reservation"
1580                                 " holder\n", type);
1581                 ret = -EINVAL;
1582                 goto out;
1583         }
1584
1585         ret = core_scsi3_alloc_aptpl_registration(&su_dev->t10_pr, sa_res_key,
1586                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1587                         res_holder, all_tg_pt, type);
1588 out:
1589         kfree(i_fabric);
1590         kfree(i_port);
1591         kfree(isid);
1592         kfree(t_fabric);
1593         kfree(t_port);
1594         kfree(orig);
1595         return (ret == 0) ? count : ret;
1596 }
1597
1598 SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);
1599
1600 CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);
1601
1602 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1603         &target_core_dev_pr_res_holder.attr,
1604         &target_core_dev_pr_res_pr_all_tgt_pts.attr,
1605         &target_core_dev_pr_res_pr_generation.attr,
1606         &target_core_dev_pr_res_pr_holder_tg_port.attr,
1607         &target_core_dev_pr_res_pr_registered_i_pts.attr,
1608         &target_core_dev_pr_res_pr_type.attr,
1609         &target_core_dev_pr_res_type.attr,
1610         &target_core_dev_pr_res_aptpl_active.attr,
1611         &target_core_dev_pr_res_aptpl_metadata.attr,
1612         NULL,
1613 };
1614
1615 static struct configfs_item_operations target_core_dev_pr_ops = {
1616         .show_attribute         = target_core_dev_pr_attr_show,
1617         .store_attribute        = target_core_dev_pr_attr_store,
1618 };
1619
1620 static struct config_item_type target_core_dev_pr_cit = {
1621         .ct_item_ops            = &target_core_dev_pr_ops,
1622         .ct_attrs               = target_core_dev_pr_attrs,
1623         .ct_owner               = THIS_MODULE,
1624 };
1625
1626 /*  End functions for struct config_item_type target_core_dev_pr_cit */
1627
1628 /*  Start functions for struct config_item_type target_core_dev_cit */
1629
1630 static ssize_t target_core_show_dev_info(void *p, char *page)
1631 {
1632         struct se_subsystem_dev *se_dev = p;
1633         struct se_hba *hba = se_dev->se_dev_hba;
1634         struct se_subsystem_api *t = hba->transport;
1635         int bl = 0;
1636         ssize_t read_bytes = 0;
1637
1638         if (!se_dev->se_dev_ptr)
1639                 return -ENODEV;
1640
1641         transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
1642         read_bytes += bl;
1643         read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
1644         return read_bytes;
1645 }
1646
1647 static struct target_core_configfs_attribute target_core_attr_dev_info = {
1648         .attr   = { .ca_owner = THIS_MODULE,
1649                     .ca_name = "info",
1650                     .ca_mode = S_IRUGO },
1651         .show   = target_core_show_dev_info,
1652         .store  = NULL,
1653 };
1654
1655 static ssize_t target_core_store_dev_control(
1656         void *p,
1657         const char *page,
1658         size_t count)
1659 {
1660         struct se_subsystem_dev *se_dev = p;
1661         struct se_hba *hba = se_dev->se_dev_hba;
1662         struct se_subsystem_api *t = hba->transport;
1663
1664         if (!se_dev->se_dev_su_ptr) {
1665                 pr_err("Unable to locate struct se_subsystem_dev>se"
1666                                 "_dev_su_ptr\n");
1667                 return -EINVAL;
1668         }
1669
1670         return t->set_configfs_dev_params(hba, se_dev, page, count);
1671 }
1672
1673 static struct target_core_configfs_attribute target_core_attr_dev_control = {
1674         .attr   = { .ca_owner = THIS_MODULE,
1675                     .ca_name = "control",
1676                     .ca_mode = S_IWUSR },
1677         .show   = NULL,
1678         .store  = target_core_store_dev_control,
1679 };
1680
1681 static ssize_t target_core_show_dev_alias(void *p, char *page)
1682 {
1683         struct se_subsystem_dev *se_dev = p;
1684
1685         if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
1686                 return 0;
1687
1688         return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_alias);
1689 }
1690
1691 static ssize_t target_core_store_dev_alias(
1692         void *p,
1693         const char *page,
1694         size_t count)
1695 {
1696         struct se_subsystem_dev *se_dev = p;
1697         struct se_hba *hba = se_dev->se_dev_hba;
1698         ssize_t read_bytes;
1699
1700         if (count > (SE_DEV_ALIAS_LEN-1)) {
1701                 pr_err("alias count: %d exceeds"
1702                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1703                         SE_DEV_ALIAS_LEN-1);
1704                 return -EINVAL;
1705         }
1706
1707         read_bytes = snprintf(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
1708                         "%s", page);
1709         if (!read_bytes)
1710                 return -EINVAL;
1711         if (se_dev->se_dev_alias[read_bytes - 1] == '\n')
1712                 se_dev->se_dev_alias[read_bytes - 1] = '\0';
1713
1714         se_dev->su_dev_flags |= SDF_USING_ALIAS;
1715
1716         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1717                 config_item_name(&hba->hba_group.cg_item),
1718                 config_item_name(&se_dev->se_dev_group.cg_item),
1719                 se_dev->se_dev_alias);
1720
1721         return read_bytes;
1722 }
1723
1724 static struct target_core_configfs_attribute target_core_attr_dev_alias = {
1725         .attr   = { .ca_owner = THIS_MODULE,
1726                     .ca_name = "alias",
1727                     .ca_mode =  S_IRUGO | S_IWUSR },
1728         .show   = target_core_show_dev_alias,
1729         .store  = target_core_store_dev_alias,
1730 };
1731
1732 static ssize_t target_core_show_dev_udev_path(void *p, char *page)
1733 {
1734         struct se_subsystem_dev *se_dev = p;
1735
1736         if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH))
1737                 return 0;
1738
1739         return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_udev_path);
1740 }
1741
1742 static ssize_t target_core_store_dev_udev_path(
1743         void *p,
1744         const char *page,
1745         size_t count)
1746 {
1747         struct se_subsystem_dev *se_dev = p;
1748         struct se_hba *hba = se_dev->se_dev_hba;
1749         ssize_t read_bytes;
1750
1751         if (count > (SE_UDEV_PATH_LEN-1)) {
1752                 pr_err("udev_path count: %d exceeds"
1753                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1754                         SE_UDEV_PATH_LEN-1);
1755                 return -EINVAL;
1756         }
1757
1758         read_bytes = snprintf(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
1759                         "%s", page);
1760         if (!read_bytes)
1761                 return -EINVAL;
1762         if (se_dev->se_dev_udev_path[read_bytes - 1] == '\n')
1763                 se_dev->se_dev_udev_path[read_bytes - 1] = '\0';
1764
1765         se_dev->su_dev_flags |= SDF_USING_UDEV_PATH;
1766
1767         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1768                 config_item_name(&hba->hba_group.cg_item),
1769                 config_item_name(&se_dev->se_dev_group.cg_item),
1770                 se_dev->se_dev_udev_path);
1771
1772         return read_bytes;
1773 }
1774
1775 static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
1776         .attr   = { .ca_owner = THIS_MODULE,
1777                     .ca_name = "udev_path",
1778                     .ca_mode =  S_IRUGO | S_IWUSR },
1779         .show   = target_core_show_dev_udev_path,
1780         .store  = target_core_store_dev_udev_path,
1781 };
1782
1783 static ssize_t target_core_store_dev_enable(
1784         void *p,
1785         const char *page,
1786         size_t count)
1787 {
1788         struct se_subsystem_dev *se_dev = p;
1789         struct se_device *dev;
1790         struct se_hba *hba = se_dev->se_dev_hba;
1791         struct se_subsystem_api *t = hba->transport;
1792         char *ptr;
1793
1794         ptr = strstr(page, "1");
1795         if (!ptr) {
1796                 pr_err("For dev_enable ops, only valid value"
1797                                 " is \"1\"\n");
1798                 return -EINVAL;
1799         }
1800         if (se_dev->se_dev_ptr) {
1801                 pr_err("se_dev->se_dev_ptr already set for storage"
1802                                 " object\n");
1803                 return -EEXIST;
1804         }
1805
1806         if (t->check_configfs_dev_params(hba, se_dev) < 0)
1807                 return -EINVAL;
1808
1809         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1810         if (IS_ERR(dev))
1811                 return PTR_ERR(dev);
1812         else if (!dev)
1813                 return -EINVAL;
1814
1815         se_dev->se_dev_ptr = dev;
1816         pr_debug("Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
1817                 " %p\n", se_dev->se_dev_ptr);
1818
1819         return count;
1820 }
1821
1822 static struct target_core_configfs_attribute target_core_attr_dev_enable = {
1823         .attr   = { .ca_owner = THIS_MODULE,
1824                     .ca_name = "enable",
1825                     .ca_mode = S_IWUSR },
1826         .show   = NULL,
1827         .store  = target_core_store_dev_enable,
1828 };
1829
1830 static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
1831 {
1832         struct se_device *dev;
1833         struct se_subsystem_dev *su_dev = p;
1834         struct config_item *lu_ci;
1835         struct t10_alua_lu_gp *lu_gp;
1836         struct t10_alua_lu_gp_member *lu_gp_mem;
1837         ssize_t len = 0;
1838
1839         dev = su_dev->se_dev_ptr;
1840         if (!dev)
1841                 return -ENODEV;
1842
1843         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED)
1844                 return len;
1845
1846         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1847         if (!lu_gp_mem) {
1848                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1849                                 " pointer\n");
1850                 return -EINVAL;
1851         }
1852
1853         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1854         lu_gp = lu_gp_mem->lu_gp;
1855         if (lu_gp) {
1856                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1857                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1858                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1859         }
1860         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1861
1862         return len;
1863 }
1864
1865 static ssize_t target_core_store_alua_lu_gp(
1866         void *p,
1867         const char *page,
1868         size_t count)
1869 {
1870         struct se_device *dev;
1871         struct se_subsystem_dev *su_dev = p;
1872         struct se_hba *hba = su_dev->se_dev_hba;
1873         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
1874         struct t10_alua_lu_gp_member *lu_gp_mem;
1875         unsigned char buf[LU_GROUP_NAME_BUF];
1876         int move = 0;
1877
1878         dev = su_dev->se_dev_ptr;
1879         if (!dev)
1880                 return -ENODEV;
1881
1882         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
1883                 pr_warn("SPC3_ALUA_EMULATED not enabled for %s/%s\n",
1884                         config_item_name(&hba->hba_group.cg_item),
1885                         config_item_name(&su_dev->se_dev_group.cg_item));
1886                 return -EINVAL;
1887         }
1888         if (count > LU_GROUP_NAME_BUF) {
1889                 pr_err("ALUA LU Group Alias too large!\n");
1890                 return -EINVAL;
1891         }
1892         memset(buf, 0, LU_GROUP_NAME_BUF);
1893         memcpy(buf, page, count);
1894         /*
1895          * Any ALUA logical unit alias besides "NULL" means we will be
1896          * making a new group association.
1897          */
1898         if (strcmp(strstrip(buf), "NULL")) {
1899                 /*
1900                  * core_alua_get_lu_gp_by_name() will increment reference to
1901                  * struct t10_alua_lu_gp.  This reference is released with
1902                  * core_alua_get_lu_gp_by_name below().
1903                  */
1904                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
1905                 if (!lu_gp_new)
1906                         return -ENODEV;
1907         }
1908         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1909         if (!lu_gp_mem) {
1910                 if (lu_gp_new)
1911                         core_alua_put_lu_gp_from_name(lu_gp_new);
1912                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1913                                 " pointer\n");
1914                 return -EINVAL;
1915         }
1916
1917         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1918         lu_gp = lu_gp_mem->lu_gp;
1919         if (lu_gp) {
1920                 /*
1921                  * Clearing an existing lu_gp association, and replacing
1922                  * with NULL
1923                  */
1924                 if (!lu_gp_new) {
1925                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
1926                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
1927                                 " %hu\n",
1928                                 config_item_name(&hba->hba_group.cg_item),
1929                                 config_item_name(&su_dev->se_dev_group.cg_item),
1930                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
1931                                 lu_gp->lu_gp_id);
1932
1933                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1934                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1935
1936                         return count;
1937                 }
1938                 /*
1939                  * Removing existing association of lu_gp_mem with lu_gp
1940                  */
1941                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1942                 move = 1;
1943         }
1944         /*
1945          * Associate lu_gp_mem with lu_gp_new.
1946          */
1947         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
1948         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1949
1950         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
1951                 " core/alua/lu_gps/%s, ID: %hu\n",
1952                 (move) ? "Moving" : "Adding",
1953                 config_item_name(&hba->hba_group.cg_item),
1954                 config_item_name(&su_dev->se_dev_group.cg_item),
1955                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
1956                 lu_gp_new->lu_gp_id);
1957
1958         core_alua_put_lu_gp_from_name(lu_gp_new);
1959         return count;
1960 }
1961
1962 static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
1963         .attr   = { .ca_owner = THIS_MODULE,
1964                     .ca_name = "alua_lu_gp",
1965                     .ca_mode = S_IRUGO | S_IWUSR },
1966         .show   = target_core_show_alua_lu_gp,
1967         .store  = target_core_store_alua_lu_gp,
1968 };
1969
1970 static struct configfs_attribute *lio_core_dev_attrs[] = {
1971         &target_core_attr_dev_info.attr,
1972         &target_core_attr_dev_control.attr,
1973         &target_core_attr_dev_alias.attr,
1974         &target_core_attr_dev_udev_path.attr,
1975         &target_core_attr_dev_enable.attr,
1976         &target_core_attr_dev_alua_lu_gp.attr,
1977         NULL,
1978 };
1979
1980 static void target_core_dev_release(struct config_item *item)
1981 {
1982         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
1983                                 struct se_subsystem_dev, se_dev_group);
1984         struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
1985         struct se_subsystem_api *t = hba->transport;
1986         struct config_group *dev_cg = &se_dev->se_dev_group;
1987
1988         kfree(dev_cg->default_groups);
1989         /*
1990          * This pointer will set when the storage is enabled with:
1991          *`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
1992          */
1993         if (se_dev->se_dev_ptr) {
1994                 pr_debug("Target_Core_ConfigFS: Calling se_free_"
1995                         "virtual_device() for se_dev_ptr: %p\n",
1996                         se_dev->se_dev_ptr);
1997
1998                 se_free_virtual_device(se_dev->se_dev_ptr, hba);
1999         } else {
2000                 /*
2001                  * Release struct se_subsystem_dev->se_dev_su_ptr..
2002                  */
2003                 pr_debug("Target_Core_ConfigFS: Calling t->free_"
2004                         "device() for se_dev_su_ptr: %p\n",
2005                         se_dev->se_dev_su_ptr);
2006
2007                 t->free_device(se_dev->se_dev_su_ptr);
2008         }
2009
2010         pr_debug("Target_Core_ConfigFS: Deallocating se_subsystem"
2011                         "_dev_t: %p\n", se_dev);
2012         kfree(se_dev);
2013 }
2014
2015 static ssize_t target_core_dev_show(struct config_item *item,
2016                                      struct configfs_attribute *attr,
2017                                      char *page)
2018 {
2019         struct se_subsystem_dev *se_dev = container_of(
2020                         to_config_group(item), struct se_subsystem_dev,
2021                         se_dev_group);
2022         struct target_core_configfs_attribute *tc_attr = container_of(
2023                         attr, struct target_core_configfs_attribute, attr);
2024
2025         if (!tc_attr->show)
2026                 return -EINVAL;
2027
2028         return tc_attr->show(se_dev, page);
2029 }
2030
2031 static ssize_t target_core_dev_store(struct config_item *item,
2032                                       struct configfs_attribute *attr,
2033                                       const char *page, size_t count)
2034 {
2035         struct se_subsystem_dev *se_dev = container_of(
2036                         to_config_group(item), struct se_subsystem_dev,
2037                         se_dev_group);
2038         struct target_core_configfs_attribute *tc_attr = container_of(
2039                         attr, struct target_core_configfs_attribute, attr);
2040
2041         if (!tc_attr->store)
2042                 return -EINVAL;
2043
2044         return tc_attr->store(se_dev, page, count);
2045 }
2046
2047 static struct configfs_item_operations target_core_dev_item_ops = {
2048         .release                = target_core_dev_release,
2049         .show_attribute         = target_core_dev_show,
2050         .store_attribute        = target_core_dev_store,
2051 };
2052
2053 static struct config_item_type target_core_dev_cit = {
2054         .ct_item_ops            = &target_core_dev_item_ops,
2055         .ct_attrs               = lio_core_dev_attrs,
2056         .ct_owner               = THIS_MODULE,
2057 };
2058
2059 /* End functions for struct config_item_type target_core_dev_cit */
2060
2061 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2062
2063 CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
2064 #define SE_DEV_ALUA_LU_ATTR(_name, _mode)                               \
2065 static struct target_core_alua_lu_gp_attribute                          \
2066                         target_core_alua_lu_gp_##_name =                \
2067         __CONFIGFS_EATTR(_name, _mode,                                  \
2068         target_core_alua_lu_gp_show_attr_##_name,                       \
2069         target_core_alua_lu_gp_store_attr_##_name);
2070
2071 #define SE_DEV_ALUA_LU_ATTR_RO(_name)                                   \
2072 static struct target_core_alua_lu_gp_attribute                          \
2073                         target_core_alua_lu_gp_##_name =                \
2074         __CONFIGFS_EATTR_RO(_name,                                      \
2075         target_core_alua_lu_gp_show_attr_##_name);
2076
2077 /*
2078  * lu_gp_id
2079  */
2080 static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
2081         struct t10_alua_lu_gp *lu_gp,
2082         char *page)
2083 {
2084         if (!lu_gp->lu_gp_valid_id)
2085                 return 0;
2086
2087         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2088 }
2089
2090 static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
2091         struct t10_alua_lu_gp *lu_gp,
2092         const char *page,
2093         size_t count)
2094 {
2095         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2096         unsigned long lu_gp_id;
2097         int ret;
2098
2099         ret = strict_strtoul(page, 0, &lu_gp_id);
2100         if (ret < 0) {
2101                 pr_err("strict_strtoul() returned %d for"
2102                         " lu_gp_id\n", ret);
2103                 return -EINVAL;
2104         }
2105         if (lu_gp_id > 0x0000ffff) {
2106                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2107                         " 0x0000ffff\n", lu_gp_id);
2108                 return -EINVAL;
2109         }
2110
2111         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2112         if (ret < 0)
2113                 return -EINVAL;
2114
2115         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2116                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2117                 config_item_name(&alua_lu_gp_cg->cg_item),
2118                 lu_gp->lu_gp_id);
2119
2120         return count;
2121 }
2122
2123 SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);
2124
2125 /*
2126  * members
2127  */
2128 static ssize_t target_core_alua_lu_gp_show_attr_members(
2129         struct t10_alua_lu_gp *lu_gp,
2130         char *page)
2131 {
2132         struct se_device *dev;
2133         struct se_hba *hba;
2134         struct se_subsystem_dev *su_dev;
2135         struct t10_alua_lu_gp_member *lu_gp_mem;
2136         ssize_t len = 0, cur_len;
2137         unsigned char buf[LU_GROUP_NAME_BUF];
2138
2139         memset(buf, 0, LU_GROUP_NAME_BUF);
2140
2141         spin_lock(&lu_gp->lu_gp_lock);
2142         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2143                 dev = lu_gp_mem->lu_gp_mem_dev;
2144                 su_dev = dev->se_sub_dev;
2145                 hba = su_dev->se_dev_hba;
2146
2147                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2148                         config_item_name(&hba->hba_group.cg_item),
2149                         config_item_name(&su_dev->se_dev_group.cg_item));
2150                 cur_len++; /* Extra byte for NULL terminator */
2151
2152                 if ((cur_len + len) > PAGE_SIZE) {
2153                         pr_warn("Ran out of lu_gp_show_attr"
2154                                 "_members buffer\n");
2155                         break;
2156                 }
2157                 memcpy(page+len, buf, cur_len);
2158                 len += cur_len;
2159         }
2160         spin_unlock(&lu_gp->lu_gp_lock);
2161
2162         return len;
2163 }
2164
2165 SE_DEV_ALUA_LU_ATTR_RO(members);
2166
2167 CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);
2168
2169 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2170         &target_core_alua_lu_gp_lu_gp_id.attr,
2171         &target_core_alua_lu_gp_members.attr,
2172         NULL,
2173 };
2174
2175 static void target_core_alua_lu_gp_release(struct config_item *item)
2176 {
2177         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2178                         struct t10_alua_lu_gp, lu_gp_group);
2179
2180         core_alua_free_lu_gp(lu_gp);
2181 }
2182
2183 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2184         .release                = target_core_alua_lu_gp_release,
2185         .show_attribute         = target_core_alua_lu_gp_attr_show,
2186         .store_attribute        = target_core_alua_lu_gp_attr_store,
2187 };
2188
2189 static struct config_item_type target_core_alua_lu_gp_cit = {
2190         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2191         .ct_attrs               = target_core_alua_lu_gp_attrs,
2192         .ct_owner               = THIS_MODULE,
2193 };
2194
2195 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2196
2197 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2198
2199 static struct config_group *target_core_alua_create_lu_gp(
2200         struct config_group *group,
2201         const char *name)
2202 {
2203         struct t10_alua_lu_gp *lu_gp;
2204         struct config_group *alua_lu_gp_cg = NULL;
2205         struct config_item *alua_lu_gp_ci = NULL;
2206
2207         lu_gp = core_alua_allocate_lu_gp(name, 0);
2208         if (IS_ERR(lu_gp))
2209                 return NULL;
2210
2211         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2212         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2213
2214         config_group_init_type_name(alua_lu_gp_cg, name,
2215                         &target_core_alua_lu_gp_cit);
2216
2217         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2218                 " Group: core/alua/lu_gps/%s\n",
2219                 config_item_name(alua_lu_gp_ci));
2220
2221         return alua_lu_gp_cg;
2222
2223 }
2224
2225 static void target_core_alua_drop_lu_gp(
2226         struct config_group *group,
2227         struct config_item *item)
2228 {
2229         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2230                         struct t10_alua_lu_gp, lu_gp_group);
2231
2232         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2233                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2234                 config_item_name(item), lu_gp->lu_gp_id);
2235         /*
2236          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2237          * -> target_core_alua_lu_gp_release()
2238          */
2239         config_item_put(item);
2240 }
2241
2242 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2243         .make_group             = &target_core_alua_create_lu_gp,
2244         .drop_item              = &target_core_alua_drop_lu_gp,
2245 };
2246
2247 static struct config_item_type target_core_alua_lu_gps_cit = {
2248         .ct_item_ops            = NULL,
2249         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2250         .ct_owner               = THIS_MODULE,
2251 };
2252
2253 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2254
2255 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2256
2257 CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
2258 #define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)                            \
2259 static struct target_core_alua_tg_pt_gp_attribute                       \
2260                         target_core_alua_tg_pt_gp_##_name =             \
2261         __CONFIGFS_EATTR(_name, _mode,                                  \
2262         target_core_alua_tg_pt_gp_show_attr_##_name,                    \
2263         target_core_alua_tg_pt_gp_store_attr_##_name);
2264
2265 #define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)                                \
2266 static struct target_core_alua_tg_pt_gp_attribute                       \
2267                         target_core_alua_tg_pt_gp_##_name =             \
2268         __CONFIGFS_EATTR_RO(_name,                                      \
2269         target_core_alua_tg_pt_gp_show_attr_##_name);
2270
2271 /*
2272  * alua_access_state
2273  */
2274 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
2275         struct t10_alua_tg_pt_gp *tg_pt_gp,
2276         char *page)
2277 {
2278         return sprintf(page, "%d\n",
2279                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
2280 }
2281
2282 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
2283         struct t10_alua_tg_pt_gp *tg_pt_gp,
2284         const char *page,
2285         size_t count)
2286 {
2287         struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
2288         unsigned long tmp;
2289         int new_state, ret;
2290
2291         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2292                 pr_err("Unable to do implict ALUA on non valid"
2293                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2294                 return -EINVAL;
2295         }
2296
2297         ret = strict_strtoul(page, 0, &tmp);
2298         if (ret < 0) {
2299                 pr_err("Unable to extract new ALUA access state from"
2300                                 " %s\n", page);
2301                 return -EINVAL;
2302         }
2303         new_state = (int)tmp;
2304
2305         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) {
2306                 pr_err("Unable to process implict configfs ALUA"
2307                         " transition while TPGS_IMPLICT_ALUA is diabled\n");
2308                 return -EINVAL;
2309         }
2310
2311         ret = core_alua_do_port_transition(tg_pt_gp, su_dev->se_dev_ptr,
2312                                         NULL, NULL, new_state, 0);
2313         return (!ret) ? count : -EINVAL;
2314 }
2315
2316 SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);
2317
2318 /*
2319  * alua_access_status
2320  */
2321 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
2322         struct t10_alua_tg_pt_gp *tg_pt_gp,
2323         char *page)
2324 {
2325         return sprintf(page, "%s\n",
2326                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2327 }
2328
2329 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
2330         struct t10_alua_tg_pt_gp *tg_pt_gp,
2331         const char *page,
2332         size_t count)
2333 {
2334         unsigned long tmp;
2335         int new_status, ret;
2336
2337         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2338                 pr_err("Unable to do set ALUA access status on non"
2339                         " valid tg_pt_gp ID: %hu\n",
2340                         tg_pt_gp->tg_pt_gp_valid_id);
2341                 return -EINVAL;
2342         }
2343
2344         ret = strict_strtoul(page, 0, &tmp);
2345         if (ret < 0) {
2346                 pr_err("Unable to extract new ALUA access status"
2347                                 " from %s\n", page);
2348                 return -EINVAL;
2349         }
2350         new_status = (int)tmp;
2351
2352         if ((new_status != ALUA_STATUS_NONE) &&
2353             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
2354             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
2355                 pr_err("Illegal ALUA access status: 0x%02x\n",
2356                                 new_status);
2357                 return -EINVAL;
2358         }
2359
2360         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2361         return count;
2362 }
2363
2364 SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);
2365
2366 /*
2367  * alua_access_type
2368  */
2369 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
2370         struct t10_alua_tg_pt_gp *tg_pt_gp,
2371         char *page)
2372 {
2373         return core_alua_show_access_type(tg_pt_gp, page);
2374 }
2375
2376 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
2377         struct t10_alua_tg_pt_gp *tg_pt_gp,
2378         const char *page,
2379         size_t count)
2380 {
2381         return core_alua_store_access_type(tg_pt_gp, page, count);
2382 }
2383
2384 SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);
2385
2386 /*
2387  * alua_write_metadata
2388  */
2389 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
2390         struct t10_alua_tg_pt_gp *tg_pt_gp,
2391         char *page)
2392 {
2393         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
2394 }
2395
2396 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
2397         struct t10_alua_tg_pt_gp *tg_pt_gp,
2398         const char *page,
2399         size_t count)
2400 {
2401         unsigned long tmp;
2402         int ret;
2403
2404         ret = strict_strtoul(page, 0, &tmp);
2405         if (ret < 0) {
2406                 pr_err("Unable to extract alua_write_metadata\n");
2407                 return -EINVAL;
2408         }
2409
2410         if ((tmp != 0) && (tmp != 1)) {
2411                 pr_err("Illegal value for alua_write_metadata:"
2412                         " %lu\n", tmp);
2413                 return -EINVAL;
2414         }
2415         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2416
2417         return count;
2418 }
2419
2420 SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);
2421
2422
2423
2424 /*
2425  * nonop_delay_msecs
2426  */
2427 static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
2428         struct t10_alua_tg_pt_gp *tg_pt_gp,
2429         char *page)
2430 {
2431         return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);
2432
2433 }
2434
2435 static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
2436         struct t10_alua_tg_pt_gp *tg_pt_gp,
2437         const char *page,
2438         size_t count)
2439 {
2440         return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
2441 }
2442
2443 SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);
2444
2445 /*
2446  * trans_delay_msecs
2447  */
2448 static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
2449         struct t10_alua_tg_pt_gp *tg_pt_gp,
2450         char *page)
2451 {
2452         return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
2453 }
2454
2455 static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
2456         struct t10_alua_tg_pt_gp *tg_pt_gp,
2457         const char *page,
2458         size_t count)
2459 {
2460         return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
2461 }
2462
2463 SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);
2464
2465 /*
2466  * preferred
2467  */
2468
2469 static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
2470         struct t10_alua_tg_pt_gp *tg_pt_gp,
2471         char *page)
2472 {
2473         return core_alua_show_preferred_bit(tg_pt_gp, page);
2474 }
2475
2476 static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
2477         struct t10_alua_tg_pt_gp *tg_pt_gp,
2478         const char *page,
2479         size_t count)
2480 {
2481         return core_alua_store_preferred_bit(tg_pt_gp, page, count);
2482 }
2483
2484 SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);
2485
2486 /*
2487  * tg_pt_gp_id
2488  */
2489 static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
2490         struct t10_alua_tg_pt_gp *tg_pt_gp,
2491         char *page)
2492 {
2493         if (!tg_pt_gp->tg_pt_gp_valid_id)
2494                 return 0;
2495
2496         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2497 }
2498
2499 static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
2500         struct t10_alua_tg_pt_gp *tg_pt_gp,
2501         const char *page,
2502         size_t count)
2503 {
2504         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2505         unsigned long tg_pt_gp_id;
2506         int ret;
2507
2508         ret = strict_strtoul(page, 0, &tg_pt_gp_id);
2509         if (ret < 0) {
2510                 pr_err("strict_strtoul() returned %d for"
2511                         " tg_pt_gp_id\n", ret);
2512                 return -EINVAL;
2513         }
2514         if (tg_pt_gp_id > 0x0000ffff) {
2515                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
2516                         " 0x0000ffff\n", tg_pt_gp_id);
2517                 return -EINVAL;
2518         }
2519
2520         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2521         if (ret < 0)
2522                 return -EINVAL;
2523
2524         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2525                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2526                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2527                 tg_pt_gp->tg_pt_gp_id);
2528
2529         return count;
2530 }
2531
2532 SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);
2533
2534 /*
2535  * members
2536  */
2537 static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
2538         struct t10_alua_tg_pt_gp *tg_pt_gp,
2539         char *page)
2540 {
2541         struct se_port *port;
2542         struct se_portal_group *tpg;
2543         struct se_lun *lun;
2544         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2545         ssize_t len = 0, cur_len;
2546         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2547
2548         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2549
2550         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2551         list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
2552                         tg_pt_gp_mem_list) {
2553                 port = tg_pt_gp_mem->tg_pt;
2554                 tpg = port->sep_tpg;
2555                 lun = port->sep_lun;
2556
2557                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2558                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2559                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2560                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2561                         config_item_name(&lun->lun_group.cg_item));
2562                 cur_len++; /* Extra byte for NULL terminator */
2563
2564                 if ((cur_len + len) > PAGE_SIZE) {
2565                         pr_warn("Ran out of lu_gp_show_attr"
2566                                 "_members buffer\n");
2567                         break;
2568                 }
2569                 memcpy(page+len, buf, cur_len);
2570                 len += cur_len;
2571         }
2572         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2573
2574         return len;
2575 }
2576
2577 SE_DEV_ALUA_TG_PT_ATTR_RO(members);
2578
2579 CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
2580                         tg_pt_gp_group);
2581
2582 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2583         &target_core_alua_tg_pt_gp_alua_access_state.attr,
2584         &target_core_alua_tg_pt_gp_alua_access_status.attr,
2585         &target_core_alua_tg_pt_gp_alua_access_type.attr,
2586         &target_core_alua_tg_pt_gp_alua_write_metadata.attr,
2587         &target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
2588         &target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
2589         &target_core_alua_tg_pt_gp_preferred.attr,
2590         &target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
2591         &target_core_alua_tg_pt_gp_members.attr,
2592         NULL,
2593 };
2594
2595 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2596 {
2597         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2598                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2599
2600         core_alua_free_tg_pt_gp(tg_pt_gp);
2601 }
2602
2603 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2604         .release                = target_core_alua_tg_pt_gp_release,
2605         .show_attribute         = target_core_alua_tg_pt_gp_attr_show,
2606         .store_attribute        = target_core_alua_tg_pt_gp_attr_store,
2607 };
2608
2609 static struct config_item_type target_core_alua_tg_pt_gp_cit = {
2610         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2611         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2612         .ct_owner               = THIS_MODULE,
2613 };
2614
2615 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2616
2617 /* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2618
2619 static struct config_group *target_core_alua_create_tg_pt_gp(
2620         struct config_group *group,
2621         const char *name)
2622 {
2623         struct t10_alua *alua = container_of(group, struct t10_alua,
2624                                         alua_tg_pt_gps_group);
2625         struct t10_alua_tg_pt_gp *tg_pt_gp;
2626         struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
2627         struct config_group *alua_tg_pt_gp_cg = NULL;
2628         struct config_item *alua_tg_pt_gp_ci = NULL;
2629
2630         tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
2631         if (!tg_pt_gp)
2632                 return NULL;
2633
2634         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2635         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2636
2637         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2638                         &target_core_alua_tg_pt_gp_cit);
2639
2640         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2641                 " Group: alua/tg_pt_gps/%s\n",
2642                 config_item_name(alua_tg_pt_gp_ci));
2643
2644         return alua_tg_pt_gp_cg;
2645 }
2646
2647 static void target_core_alua_drop_tg_pt_gp(
2648         struct config_group *group,
2649         struct config_item *item)
2650 {
2651         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2652                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2653
2654         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2655                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2656                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2657         /*
2658          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2659          * -> target_core_alua_tg_pt_gp_release().
2660          */
2661         config_item_put(item);
2662 }
2663
2664 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2665         .make_group             = &target_core_alua_create_tg_pt_gp,
2666         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2667 };
2668
2669 static struct config_item_type target_core_alua_tg_pt_gps_cit = {
2670         .ct_group_ops           = &target_core_alua_tg_pt_gps_group_ops,
2671         .ct_owner               = THIS_MODULE,
2672 };
2673
2674 /* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2675
2676 /* Start functions for struct config_item_type target_core_alua_cit */
2677
2678 /*
2679  * target_core_alua_cit is a ConfigFS group that lives under
2680  * /sys/kernel/config/target/core/alua.  There are default groups
2681  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2682  * target_core_alua_cit in target_core_init_configfs() below.
2683  */
2684 static struct config_item_type target_core_alua_cit = {
2685         .ct_item_ops            = NULL,
2686         .ct_attrs               = NULL,
2687         .ct_owner               = THIS_MODULE,
2688 };
2689
2690 /* End functions for struct config_item_type target_core_alua_cit */
2691
2692 /* Start functions for struct config_item_type target_core_stat_cit */
2693
2694 static struct config_group *target_core_stat_mkdir(
2695         struct config_group *group,
2696         const char *name)
2697 {
2698         return ERR_PTR(-ENOSYS);
2699 }
2700
2701 static void target_core_stat_rmdir(
2702         struct config_group *group,
2703         struct config_item *item)
2704 {
2705         return;
2706 }
2707
2708 static struct configfs_group_operations target_core_stat_group_ops = {
2709         .make_group             = &target_core_stat_mkdir,
2710         .drop_item              = &target_core_stat_rmdir,
2711 };
2712
2713 static struct config_item_type target_core_stat_cit = {
2714         .ct_group_ops           = &target_core_stat_group_ops,
2715         .ct_owner               = THIS_MODULE,
2716 };
2717
2718 /* End functions for struct config_item_type target_core_stat_cit */
2719
2720 /* Start functions for struct config_item_type target_core_hba_cit */
2721
2722 static struct config_group *target_core_make_subdev(
2723         struct config_group *group,
2724         const char *name)
2725 {
2726         struct t10_alua_tg_pt_gp *tg_pt_gp;
2727         struct se_subsystem_dev *se_dev;
2728         struct se_subsystem_api *t;
2729         struct config_item *hba_ci = &group->cg_item;
2730         struct se_hba *hba = item_to_hba(hba_ci);
2731         struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
2732         struct config_group *dev_stat_grp = NULL;
2733         int errno = -ENOMEM, ret;
2734
2735         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2736         if (ret)
2737                 return ERR_PTR(ret);
2738         /*
2739          * Locate the struct se_subsystem_api from parent's struct se_hba.
2740          */
2741         t = hba->transport;
2742
2743         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
2744         if (!se_dev) {
2745                 pr_err("Unable to allocate memory for"
2746                                 " struct se_subsystem_dev\n");
2747                 goto unlock;
2748         }
2749         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
2750         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
2751         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
2752         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
2753         spin_lock_init(&se_dev->t10_pr.registration_lock);
2754         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
2755         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
2756         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
2757         spin_lock_init(&se_dev->se_dev_lock);
2758         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
2759         se_dev->t10_wwn.t10_sub_dev = se_dev;
2760         se_dev->t10_alua.t10_sub_dev = se_dev;
2761         se_dev->se_dev_attrib.da_sub_dev = se_dev;
2762
2763         se_dev->se_dev_hba = hba;
2764         dev_cg = &se_dev->se_dev_group;
2765
2766         dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 7,
2767                         GFP_KERNEL);
2768         if (!dev_cg->default_groups)
2769                 goto out;
2770         /*
2771          * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
2772          * for ->allocate_virtdevice()
2773          *
2774          * se_dev->se_dev_ptr will be set after ->create_virtdev()
2775          * has been called successfully in the next level up in the
2776          * configfs tree for device object's struct config_group.
2777          */
2778         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
2779         if (!se_dev->se_dev_su_ptr) {
2780                 pr_err("Unable to locate subsystem dependent pointer"
2781                         " from allocate_virtdevice()\n");
2782                 goto out;
2783         }
2784
2785         config_group_init_type_name(&se_dev->se_dev_group, name,
2786                         &target_core_dev_cit);
2787         config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
2788                         &target_core_dev_attrib_cit);
2789         config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
2790                         &target_core_dev_pr_cit);
2791         config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
2792                         &target_core_dev_wwn_cit);
2793         config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
2794                         "alua", &target_core_alua_tg_pt_gps_cit);
2795         config_group_init_type_name(&se_dev->dev_stat_grps.stat_group,
2796                         "statistics", &target_core_stat_cit);
2797
2798         dev_cg->default_groups[0] = &se_dev->se_dev_attrib.da_group;
2799         dev_cg->default_groups[1] = &se_dev->se_dev_pr_group;
2800         dev_cg->default_groups[2] = &se_dev->t10_wwn.t10_wwn_group;
2801         dev_cg->default_groups[3] = &se_dev->t10_alua.alua_tg_pt_gps_group;
2802         dev_cg->default_groups[4] = &se_dev->dev_stat_grps.stat_group;
2803         dev_cg->default_groups[5] = NULL;
2804         /*
2805          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2806          */
2807         tg_pt_gp = core_alua_allocate_tg_pt_gp(se_dev, "default_tg_pt_gp", 1);
2808         if (!tg_pt_gp)
2809                 goto out;
2810
2811         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2812         tg_pt_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
2813                                 GFP_KERNEL);
2814         if (!tg_pt_gp_cg->default_groups) {
2815                 pr_err("Unable to allocate tg_pt_gp_cg->"
2816                                 "default_groups\n");
2817                 goto out;
2818         }
2819
2820         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2821                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2822         tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
2823         tg_pt_gp_cg->default_groups[1] = NULL;
2824         se_dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2825         /*
2826          * Add core/$HBA/$DEV/statistics/ default groups
2827          */
2828         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2829         dev_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 4,
2830                                 GFP_KERNEL);
2831         if (!dev_stat_grp->default_groups) {
2832                 pr_err("Unable to allocate dev_stat_grp->default_groups\n");
2833                 goto out;
2834         }
2835         target_stat_setup_dev_default_groups(se_dev);
2836
2837         pr_debug("Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
2838                 " %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);
2839
2840         mutex_unlock(&hba->hba_access_mutex);
2841         return &se_dev->se_dev_group;
2842 out:
2843         if (se_dev->t10_alua.default_tg_pt_gp) {
2844                 core_alua_free_tg_pt_gp(se_dev->t10_alua.default_tg_pt_gp);
2845                 se_dev->t10_alua.default_tg_pt_gp = NULL;
2846         }
2847         if (dev_stat_grp)
2848                 kfree(dev_stat_grp->default_groups);
2849         if (tg_pt_gp_cg)
2850                 kfree(tg_pt_gp_cg->default_groups);
2851         if (dev_cg)
2852                 kfree(dev_cg->default_groups);
2853         if (se_dev->se_dev_su_ptr)
2854                 t->free_device(se_dev->se_dev_su_ptr);
2855         kfree(se_dev);
2856 unlock:
2857         mutex_unlock(&hba->hba_access_mutex);
2858         return ERR_PTR(errno);
2859 }
2860
2861 static void target_core_drop_subdev(
2862         struct config_group *group,
2863         struct config_item *item)
2864 {
2865         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
2866                                 struct se_subsystem_dev, se_dev_group);
2867         struct se_hba *hba;
2868         struct se_subsystem_api *t;
2869         struct config_item *df_item;
2870         struct config_group *dev_cg, *tg_pt_gp_cg, *dev_stat_grp;
2871         int i;
2872
2873         hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
2874
2875         mutex_lock(&hba->hba_access_mutex);
2876         t = hba->transport;
2877
2878         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2879         for (i = 0; dev_stat_grp->default_groups[i]; i++) {
2880                 df_item = &dev_stat_grp->default_groups[i]->cg_item;
2881                 dev_stat_grp->default_groups[i] = NULL;
2882                 config_item_put(df_item);
2883         }
2884         kfree(dev_stat_grp->default_groups);
2885
2886         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2887         for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
2888                 df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
2889                 tg_pt_gp_cg->default_groups[i] = NULL;
2890                 config_item_put(df_item);
2891         }
2892         kfree(tg_pt_gp_cg->default_groups);
2893         /*
2894          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
2895          * directly from target_core_alua_tg_pt_gp_release().
2896          */
2897         se_dev->t10_alua.default_tg_pt_gp = NULL;
2898
2899         dev_cg = &se_dev->se_dev_group;
2900         for (i = 0; dev_cg->default_groups[i]; i++) {
2901                 df_item = &dev_cg->default_groups[i]->cg_item;
2902                 dev_cg->default_groups[i] = NULL;
2903                 config_item_put(df_item);
2904         }
2905         /*
2906          * The releasing of se_dev and associated se_dev->se_dev_ptr is done
2907          * from target_core_dev_item_ops->release() ->target_core_dev_release().
2908          */
2909         config_item_put(item);
2910         mutex_unlock(&hba->hba_access_mutex);
2911 }
2912
2913 static struct configfs_group_operations target_core_hba_group_ops = {
2914         .make_group             = target_core_make_subdev,
2915         .drop_item              = target_core_drop_subdev,
2916 };
2917
2918 CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
2919 #define SE_HBA_ATTR(_name, _mode)                               \
2920 static struct target_core_hba_attribute                         \
2921                 target_core_hba_##_name =                       \
2922                 __CONFIGFS_EATTR(_name, _mode,                  \
2923                 target_core_hba_show_attr_##_name,              \
2924                 target_core_hba_store_attr_##_name);
2925
2926 #define SE_HBA_ATTR_RO(_name)                                   \
2927 static struct target_core_hba_attribute                         \
2928                 target_core_hba_##_name =                       \
2929                 __CONFIGFS_EATTR_RO(_name,                      \
2930                 target_core_hba_show_attr_##_name);
2931
2932 static ssize_t target_core_hba_show_attr_hba_info(
2933         struct se_hba *hba,
2934         char *page)
2935 {
2936         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
2937                         hba->hba_id, hba->transport->name,
2938                         TARGET_CORE_CONFIGFS_VERSION);
2939 }
2940
2941 SE_HBA_ATTR_RO(hba_info);
2942
2943 static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
2944                                 char *page)
2945 {
2946         int hba_mode = 0;
2947
2948         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
2949                 hba_mode = 1;
2950
2951         return sprintf(page, "%d\n", hba_mode);
2952 }
2953
2954 static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
2955                                 const char *page, size_t count)
2956 {
2957         struct se_subsystem_api *transport = hba->transport;
2958         unsigned long mode_flag;
2959         int ret;
2960
2961         if (transport->pmode_enable_hba == NULL)
2962                 return -EINVAL;
2963
2964         ret = strict_strtoul(page, 0, &mode_flag);
2965         if (ret < 0) {
2966                 pr_err("Unable to extract hba mode flag: %d\n", ret);
2967                 return -EINVAL;
2968         }
2969
2970         spin_lock(&hba->device_lock);
2971         if (!list_empty(&hba->hba_dev_list)) {
2972                 pr_err("Unable to set hba_mode with active devices\n");
2973                 spin_unlock(&hba->device_lock);
2974                 return -EINVAL;
2975         }
2976         spin_unlock(&hba->device_lock);
2977
2978         ret = transport->pmode_enable_hba(hba, mode_flag);
2979         if (ret < 0)
2980                 return -EINVAL;
2981         if (ret > 0)
2982                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
2983         else if (ret == 0)
2984                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
2985
2986         return count;
2987 }
2988
2989 SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
2990
2991 CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
2992
2993 static void target_core_hba_release(struct config_item *item)
2994 {
2995         struct se_hba *hba = container_of(to_config_group(item),
2996                                 struct se_hba, hba_group);
2997         core_delete_hba(hba);
2998 }
2999
3000 static struct configfs_attribute *target_core_hba_attrs[] = {
3001         &target_core_hba_hba_info.attr,
3002         &target_core_hba_hba_mode.attr,
3003         NULL,
3004 };
3005
3006 static struct configfs_item_operations target_core_hba_item_ops = {
3007         .release                = target_core_hba_release,
3008         .show_attribute         = target_core_hba_attr_show,
3009         .store_attribute        = target_core_hba_attr_store,
3010 };
3011
3012 static struct config_item_type target_core_hba_cit = {
3013         .ct_item_ops            = &target_core_hba_item_ops,
3014         .ct_group_ops           = &target_core_hba_group_ops,
3015         .ct_attrs               = target_core_hba_attrs,
3016         .ct_owner               = THIS_MODULE,
3017 };
3018
3019 static struct config_group *target_core_call_addhbatotarget(
3020         struct config_group *group,
3021         const char *name)
3022 {
3023         char *se_plugin_str, *str, *str2;
3024         struct se_hba *hba;
3025         char buf[TARGET_CORE_NAME_MAX_LEN];
3026         unsigned long plugin_dep_id = 0;
3027         int ret;
3028
3029         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3030         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3031                 pr_err("Passed *name strlen(): %d exceeds"
3032                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3033                         TARGET_CORE_NAME_MAX_LEN);
3034                 return ERR_PTR(-ENAMETOOLONG);
3035         }
3036         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3037
3038         str = strstr(buf, "_");
3039         if (!str) {
3040                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3041                 return ERR_PTR(-EINVAL);
3042         }
3043         se_plugin_str = buf;
3044         /*
3045          * Special case for subsystem plugins that have "_" in their names.
3046          * Namely rd_direct and rd_mcp..
3047          */
3048         str2 = strstr(str+1, "_");
3049         if (str2) {
3050                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3051                 str2++; /* Skip to start of plugin dependent ID */
3052                 str = str2;
3053         } else {
3054                 *str = '\0'; /* Terminate for *se_plugin_str */
3055                 str++; /* Skip to start of plugin dependent ID */
3056         }
3057
3058         ret = strict_strtoul(str, 0, &plugin_dep_id);
3059         if (ret < 0) {
3060                 pr_err("strict_strtoul() returned %d for"
3061                                 " plugin_dep_id\n", ret);
3062                 return ERR_PTR(-EINVAL);
3063         }
3064         /*
3065          * Load up TCM subsystem plugins if they have not already been loaded.
3066          */
3067         transport_subsystem_check_init();
3068
3069         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3070         if (IS_ERR(hba))
3071                 return ERR_CAST(hba);
3072
3073         config_group_init_type_name(&hba->hba_group, name,
3074                         &target_core_hba_cit);
3075
3076         return &hba->hba_group;
3077 }
3078
3079 static void target_core_call_delhbafromtarget(
3080         struct config_group *group,
3081         struct config_item *item)
3082 {
3083         /*
3084          * core_delete_hba() is called from target_core_hba_item_ops->release()
3085          * -> target_core_hba_release()
3086          */
3087         config_item_put(item);
3088 }
3089
3090 static struct configfs_group_operations target_core_group_ops = {
3091         .make_group     = target_core_call_addhbatotarget,
3092         .drop_item      = target_core_call_delhbafromtarget,
3093 };
3094
3095 static struct config_item_type target_core_cit = {
3096         .ct_item_ops    = NULL,
3097         .ct_group_ops   = &target_core_group_ops,
3098         .ct_attrs       = NULL,
3099         .ct_owner       = THIS_MODULE,
3100 };
3101
3102 /* Stop functions for struct config_item_type target_core_hba_cit */
3103
3104 static int __init target_core_init_configfs(void)
3105 {
3106         struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
3107         struct config_group *lu_gp_cg = NULL;
3108         struct configfs_subsystem *subsys;
3109         struct t10_alua_lu_gp *lu_gp;
3110         int ret;
3111
3112         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3113                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3114                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3115
3116         subsys = target_core_subsystem[0];
3117         config_group_init(&subsys->su_group);
3118         mutex_init(&subsys->su_mutex);
3119
3120         INIT_LIST_HEAD(&g_tf_list);
3121         mutex_init(&g_tf_lock);
3122         ret = init_se_kmem_caches();
3123         if (ret < 0)
3124                 return ret;
3125         /*
3126          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3127          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3128          */
3129         target_cg = &subsys->su_group;
3130         target_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3131                                 GFP_KERNEL);
3132         if (!target_cg->default_groups) {
3133                 pr_err("Unable to allocate target_cg->default_groups\n");
3134                 goto out_global;
3135         }
3136
3137         config_group_init_type_name(&target_core_hbagroup,
3138                         "core", &target_core_cit);
3139         target_cg->default_groups[0] = &target_core_hbagroup;
3140         target_cg->default_groups[1] = NULL;
3141         /*
3142          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3143          */
3144         hba_cg = &target_core_hbagroup;
3145         hba_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3146                                 GFP_KERNEL);
3147         if (!hba_cg->default_groups) {
3148                 pr_err("Unable to allocate hba_cg->default_groups\n");
3149                 goto out_global;
3150         }
3151         config_group_init_type_name(&alua_group,
3152                         "alua", &target_core_alua_cit);
3153         hba_cg->default_groups[0] = &alua_group;
3154         hba_cg->default_groups[1] = NULL;
3155         /*
3156          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3157          * groups under /sys/kernel/config/target/core/alua/
3158          */
3159         alua_cg = &alua_group;
3160         alua_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3161                         GFP_KERNEL);
3162         if (!alua_cg->default_groups) {
3163                 pr_err("Unable to allocate alua_cg->default_groups\n");
3164                 goto out_global;
3165         }
3166
3167         config_group_init_type_name(&alua_lu_gps_group,
3168                         "lu_gps", &target_core_alua_lu_gps_cit);
3169         alua_cg->default_groups[0] = &alua_lu_gps_group;
3170         alua_cg->default_groups[1] = NULL;
3171         /*
3172          * Add core/alua/lu_gps/default_lu_gp
3173          */
3174         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3175         if (IS_ERR(lu_gp))
3176                 goto out_global;
3177
3178         lu_gp_cg = &alua_lu_gps_group;
3179         lu_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3180                         GFP_KERNEL);
3181         if (!lu_gp_cg->default_groups) {
3182                 pr_err("Unable to allocate lu_gp_cg->default_groups\n");
3183                 goto out_global;
3184         }
3185
3186         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3187                                 &target_core_alua_lu_gp_cit);
3188         lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
3189         lu_gp_cg->default_groups[1] = NULL;
3190         default_lu_gp = lu_gp;
3191         /*
3192          * Register the target_core_mod subsystem with configfs.
3193          */
3194         ret = configfs_register_subsystem(subsys);
3195         if (ret < 0) {
3196                 pr_err("Error %d while registering subsystem %s\n",
3197                         ret, subsys->su_group.cg_item.ci_namebuf);
3198                 goto out_global;
3199         }
3200         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3201                 " Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
3202                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3203         /*
3204          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3205          */
3206         ret = rd_module_init();
3207         if (ret < 0)
3208                 goto out;
3209
3210         if (core_dev_setup_virtual_lun0() < 0)
3211                 goto out;
3212
3213         return 0;
3214
3215 out:
3216         configfs_unregister_subsystem(subsys);
3217         core_dev_release_virtual_lun0();
3218         rd_module_exit();
3219 out_global:
3220         if (default_lu_gp) {
3221                 core_alua_free_lu_gp(default_lu_gp);
3222                 default_lu_gp = NULL;
3223         }
3224         if (lu_gp_cg)
3225                 kfree(lu_gp_cg->default_groups);
3226         if (alua_cg)
3227                 kfree(alua_cg->default_groups);
3228         if (hba_cg)
3229                 kfree(hba_cg->default_groups);
3230         kfree(target_cg->default_groups);
3231         release_se_kmem_caches();
3232         return ret;
3233 }
3234
3235 static void __exit target_core_exit_configfs(void)
3236 {
3237         struct configfs_subsystem *subsys;
3238         struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
3239         struct config_item *item;
3240         int i;
3241
3242         subsys = target_core_subsystem[0];
3243
3244         lu_gp_cg = &alua_lu_gps_group;
3245         for (i = 0; lu_gp_cg->default_groups[i]; i++) {
3246                 item = &lu_gp_cg->default_groups[i]->cg_item;
3247                 lu_gp_cg->default_groups[i] = NULL;
3248                 config_item_put(item);
3249         }
3250         kfree(lu_gp_cg->default_groups);
3251         lu_gp_cg->default_groups = NULL;
3252
3253         alua_cg = &alua_group;
3254         for (i = 0; alua_cg->default_groups[i]; i++) {
3255                 item = &alua_cg->default_groups[i]->cg_item;
3256                 alua_cg->default_groups[i] = NULL;
3257                 config_item_put(item);
3258         }
3259         kfree(alua_cg->default_groups);
3260         alua_cg->default_groups = NULL;
3261
3262         hba_cg = &target_core_hbagroup;
3263         for (i = 0; hba_cg->default_groups[i]; i++) {
3264                 item = &hba_cg->default_groups[i]->cg_item;
3265                 hba_cg->default_groups[i] = NULL;
3266                 config_item_put(item);
3267         }
3268         kfree(hba_cg->default_groups);
3269         hba_cg->default_groups = NULL;
3270         /*
3271          * We expect subsys->su_group.default_groups to be released
3272          * by configfs subsystem provider logic..
3273          */
3274         configfs_unregister_subsystem(subsys);
3275         kfree(subsys->su_group.default_groups);
3276
3277         core_alua_free_lu_gp(default_lu_gp);
3278         default_lu_gp = NULL;
3279
3280         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3281                         " Infrastructure\n");
3282
3283         core_dev_release_virtual_lun0();
3284         rd_module_exit();
3285         release_se_kmem_caches();
3286 }
3287
3288 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3289 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3290 MODULE_LICENSE("GPL");
3291
3292 module_init(target_core_init_configfs);
3293 module_exit(target_core_exit_configfs);