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_device.h>
  43 #include <target/target_core_transport.h>
  44 #include <target/target_core_fabric_ops.h>
  45 #include <target/target_core_fabric_configfs.h>
  46 #include <target/target_core_configfs.h>
  47 #include <target/configfs_macros.h>
  48
  49 #include "target_core_alua.h"
  50 #include "target_core_hba.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_rd.h"
  53 #include "target_core_stat.h"
  54
  55 extern struct t10_alua_lu_gp *default_lu_gp;
  56
  57 static struct list_head g_tf_list;
  58 static struct mutex g_tf_lock;
  59
  60 struct target_core_configfs_attribute {
  61         struct configfs_attribute attr;
  62         ssize_t (*show)(void *, char *);
  63         ssize_t (*store)(void *, const char *, size_t);
  64 };
  65
  66 static struct config_group target_core_hbagroup;
  67 static struct config_group alua_group;
  68 static struct config_group alua_lu_gps_group;
  69
  70 static DEFINE_SPINLOCK(se_device_lock);
  71 static LIST_HEAD(se_dev_list);
  72
  73 static inline struct se_hba *
  74 item_to_hba(struct config_item *item)
  75 {
  76         return container_of(to_config_group(item), struct se_hba, hba_group);
  77 }
  78
  79 /*
  80  * Attributes for /sys/kernel/config/target/
  81  */
  82 static ssize_t target_core_attr_show(struct config_item *item,
  83                                       struct configfs_attribute *attr,
  84                                       char *page)
  85 {
  86         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
  87                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
  88                 utsname()->sysname, utsname()->machine);
  89 }
  90
  91 static struct configfs_item_operations target_core_fabric_item_ops = {
  92         .show_attribute = target_core_attr_show,
  93 };
  94
  95 static struct configfs_attribute target_core_item_attr_version = {
  96         .ca_owner       = THIS_MODULE,
  97         .ca_name        = "version",
  98         .ca_mode        = S_IRUGO,
  99 };
 100
 101 static struct target_fabric_configfs *target_core_get_fabric(
 102         const char *name)
 103 {
 104         struct target_fabric_configfs *tf;
 105
 106         if (!name)
 107                 return NULL;
 108
 109         mutex_lock(&g_tf_lock);
 110         list_for_each_entry(tf, &g_tf_list, tf_list) {
 111                 if (!strcmp(tf->tf_name, name)) {
 112                         atomic_inc(&tf->tf_access_cnt);
 113                         mutex_unlock(&g_tf_lock);
 114                         return tf;
 115                 }
 116         }
 117         mutex_unlock(&g_tf_lock);
 118
 119         return NULL;
 120 }
 121
 122 /*
 123  * Called from struct target_core_group_ops->make_group()
 124  */
 125 static struct config_group *target_core_register_fabric(
 126         struct config_group *group,
 127         const char *name)
 128 {
 129         struct target_fabric_configfs *tf;
 130         int ret;
 131
 132         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
 133                         " %s\n", group, name);
 134         /*
 135          * Below are some hardcoded request_module() calls to automatically
 136          * local fabric modules when the following is called:
 137          *
 138          * mkdir -p /sys/kernel/config/target/$MODULE_NAME
 139          *
 140          * Note that this does not limit which TCM fabric module can be
 141          * registered, but simply provids auto loading logic for modules with
 142          * mkdir(2) system calls with known TCM fabric modules.
 143          */
 144         if (!strncmp(name, "iscsi", 5)) {
 145                 /*
 146                  * Automatically load the LIO Target fabric module when the
 147                  * following is called:
 148                  *
 149                  * mkdir -p $CONFIGFS/target/iscsi
 150                  */
 151                 ret = request_module("iscsi_target_mod");
 152                 if (ret < 0) {
 153                         pr_err("request_module() failed for"
 154                                 " iscsi_target_mod.ko: %d\n", ret);
 155                         return ERR_PTR(-EINVAL);
 156                 }
 157         } else if (!strncmp(name, "loopback", 8)) {
 158                 /*
 159                  * Automatically load the tcm_loop fabric module when the
 160                  * following is called:
 161                  *
 162                  * mkdir -p $CONFIGFS/target/loopback
 163                  */
 164                 ret = request_module("tcm_loop");
 165                 if (ret < 0) {
 166                         pr_err("request_module() failed for"
 167                                 " tcm_loop.ko: %d\n", ret);
 168                         return ERR_PTR(-EINVAL);
 169                 }
 170         }
 171
 172         tf = target_core_get_fabric(name);
 173         if (!tf) {
 174                 pr_err("target_core_get_fabric() failed for %s\n",
 175                         name);
 176                 return ERR_PTR(-EINVAL);
 177         }
 178         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
 179                         " %s\n", tf->tf_name);
 180         /*
 181          * On a successful target_core_get_fabric() look, the returned
 182          * struct target_fabric_configfs *tf will contain a usage reference.
 183          */
 184         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
 185                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 186
 187         tf->tf_group.default_groups = tf->tf_default_groups;
 188         tf->tf_group.default_groups[0] = &tf->tf_disc_group;
 189         tf->tf_group.default_groups[1] = NULL;
 190
 191         config_group_init_type_name(&tf->tf_group, name,
 192                         &TF_CIT_TMPL(tf)->tfc_wwn_cit);
 193         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
 194                         &TF_CIT_TMPL(tf)->tfc_discovery_cit);
 195
 196         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
 197                         " %s\n", tf->tf_group.cg_item.ci_name);
 198         /*
 199          * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
 200          */
 201         tf->tf_ops.tf_subsys = tf->tf_subsys;
 202         tf->tf_fabric = &tf->tf_group.cg_item;
 203         pr_debug("Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
 204                         " for %s\n", name);
 205
 206         return &tf->tf_group;
 207 }
 208
 209 /*
 210  * Called from struct target_core_group_ops->drop_item()
 211  */
 212 static void target_core_deregister_fabric(
 213         struct config_group *group,
 214         struct config_item *item)
 215 {
 216         struct target_fabric_configfs *tf = container_of(
 217                 to_config_group(item), struct target_fabric_configfs, tf_group);
 218         struct config_group *tf_group;
 219         struct config_item *df_item;
 220         int i;
 221
 222         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
 223                 " tf list\n", config_item_name(item));
 224
 225         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
 226                         " %s\n", tf->tf_name);
 227         atomic_dec(&tf->tf_access_cnt);
 228
 229         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing"
 230                         " tf->tf_fabric for %s\n", tf->tf_name);
 231         tf->tf_fabric = NULL;
 232
 233         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
 234                         " %s\n", config_item_name(item));
 235
 236         tf_group = &tf->tf_group;
 237         for (i = 0; tf_group->default_groups[i]; i++) {
 238                 df_item = &tf_group->default_groups[i]->cg_item;
 239                 tf_group->default_groups[i] = NULL;
 240                 config_item_put(df_item);
 241         }
 242         config_item_put(item);
 243 }
 244
 245 static struct configfs_group_operations target_core_fabric_group_ops = {
 246         .make_group     = &target_core_register_fabric,
 247         .drop_item      = &target_core_deregister_fabric,
 248 };
 249
 250 /*
 251  * All item attributes appearing in /sys/kernel/target/ appear here.
 252  */
 253 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
 254         &target_core_item_attr_version,
 255         NULL,
 256 };
 257
 258 /*
 259  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
 260  */
 261 static struct config_item_type target_core_fabrics_item = {
 262         .ct_item_ops    = &target_core_fabric_item_ops,
 263         .ct_group_ops   = &target_core_fabric_group_ops,
 264         .ct_attrs       = target_core_fabric_item_attrs,
 265         .ct_owner       = THIS_MODULE,
 266 };
 267
 268 static struct configfs_subsystem target_core_fabrics = {
 269         .su_group = {
 270                 .cg_item = {
 271                         .ci_namebuf = "target",
 272                         .ci_type = &target_core_fabrics_item,
 273                 },
 274         },
 275 };
 276
 277 static struct configfs_subsystem *target_core_subsystem[] = {
 278         &target_core_fabrics,
 279         NULL,
 280 };
 281
 282 /*##############################################################################
 283 // Start functions called by external Target Fabrics Modules
 284 //############################################################################*/
 285
 286 /*
 287  * First function called by fabric modules to:
 288  *
 289  * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
 290  * 2) Add struct target_fabric_configfs to g_tf_list
 291  * 3) Return struct target_fabric_configfs to fabric module to be passed
 292  *    into target_fabric_configfs_register().
 293  */
 294 struct target_fabric_configfs *target_fabric_configfs_init(
 295         struct module *fabric_mod,
 296         const char *name)
 297 {
 298         struct target_fabric_configfs *tf;
 299
 300         if (!(name)) {
 301                 pr_err("Unable to locate passed fabric name\n");
 302                 return ERR_PTR(-EINVAL);
 303         }
 304         if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
 305                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
 306                         "_NAME_SIZE\n", name);
 307                 return ERR_PTR(-EINVAL);
 308         }
 309
 310         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
 311         if (!tf)
 312                 return ERR_PTR(-ENOMEM);
 313
 314         INIT_LIST_HEAD(&tf->tf_list);
 315         atomic_set(&tf->tf_access_cnt, 0);
 316         /*
 317          * Setup the default generic struct config_item_type's (cits) in
 318          * struct target_fabric_configfs->tf_cit_tmpl
 319          */
 320         tf->tf_module = fabric_mod;
 321         target_fabric_setup_cits(tf);
 322
 323         tf->tf_subsys = target_core_subsystem[0];
 324         snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
 325
 326         mutex_lock(&g_tf_lock);
 327         list_add_tail(&tf->tf_list, &g_tf_list);
 328         mutex_unlock(&g_tf_lock);
 329
 330         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
 331                         ">>>>>>>>>>>>>>\n");
 332         pr_debug("Initialized struct target_fabric_configfs: %p for"
 333                         " %s\n", tf, tf->tf_name);
 334         return tf;
 335 }
 336 EXPORT_SYMBOL(target_fabric_configfs_init);
 337
 338 /*
 339  * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
 340  */
 341 void target_fabric_configfs_free(
 342         struct target_fabric_configfs *tf)
 343 {
 344         mutex_lock(&g_tf_lock);
 345         list_del(&tf->tf_list);
 346         mutex_unlock(&g_tf_lock);
 347
 348         kfree(tf);
 349 }
 350 EXPORT_SYMBOL(target_fabric_configfs_free);
 351
 352 /*
 353  * Perform a sanity check of the passed tf->tf_ops before completing
 354  * TCM fabric module registration.
 355  */
 356 static int target_fabric_tf_ops_check(
 357         struct target_fabric_configfs *tf)
 358 {
 359         struct target_core_fabric_ops *tfo = &tf->tf_ops;
 360
 361         if (!tfo->get_fabric_name) {
 362                 pr_err("Missing tfo->get_fabric_name()\n");
 363                 return -EINVAL;
 364         }
 365         if (!tfo->get_fabric_proto_ident) {
 366                 pr_err("Missing tfo->get_fabric_proto_ident()\n");
 367                 return -EINVAL;
 368         }
 369         if (!tfo->tpg_get_wwn) {
 370                 pr_err("Missing tfo->tpg_get_wwn()\n");
 371                 return -EINVAL;
 372         }
 373         if (!tfo->tpg_get_tag) {
 374                 pr_err("Missing tfo->tpg_get_tag()\n");
 375                 return -EINVAL;
 376         }
 377         if (!tfo->tpg_get_default_depth) {
 378                 pr_err("Missing tfo->tpg_get_default_depth()\n");
 379                 return -EINVAL;
 380         }
 381         if (!tfo->tpg_get_pr_transport_id) {
 382                 pr_err("Missing tfo->tpg_get_pr_transport_id()\n");
 383                 return -EINVAL;
 384         }
 385         if (!tfo->tpg_get_pr_transport_id_len) {
 386                 pr_err("Missing tfo->tpg_get_pr_transport_id_len()\n");
 387                 return -EINVAL;
 388         }
 389         if (!tfo->tpg_check_demo_mode) {
 390                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
 391                 return -EINVAL;
 392         }
 393         if (!tfo->tpg_check_demo_mode_cache) {
 394                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
 395                 return -EINVAL;
 396         }
 397         if (!tfo->tpg_check_demo_mode_write_protect) {
 398                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
 399                 return -EINVAL;
 400         }
 401         if (!tfo->tpg_check_prod_mode_write_protect) {
 402                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
 403                 return -EINVAL;
 404         }
 405         if (!tfo->tpg_alloc_fabric_acl) {
 406                 pr_err("Missing tfo->tpg_alloc_fabric_acl()\n");
 407                 return -EINVAL;
 408         }
 409         if (!tfo->tpg_release_fabric_acl) {
 410                 pr_err("Missing tfo->tpg_release_fabric_acl()\n");
 411                 return -EINVAL;
 412         }
 413         if (!tfo->tpg_get_inst_index) {
 414                 pr_err("Missing tfo->tpg_get_inst_index()\n");
 415                 return -EINVAL;
 416         }
 417         if (!tfo->release_cmd) {
 418                 pr_err("Missing tfo->release_cmd()\n");
 419                 return -EINVAL;
 420         }
 421         if (!tfo->shutdown_session) {
 422                 pr_err("Missing tfo->shutdown_session()\n");
 423                 return -EINVAL;
 424         }
 425         if (!tfo->close_session) {
 426                 pr_err("Missing tfo->close_session()\n");
 427                 return -EINVAL;
 428         }
 429         if (!tfo->stop_session) {
 430                 pr_err("Missing tfo->stop_session()\n");
 431                 return -EINVAL;
 432         }
 433         if (!tfo->fall_back_to_erl0) {
 434                 pr_err("Missing tfo->fall_back_to_erl0()\n");
 435                 return -EINVAL;
 436         }
 437         if (!tfo->sess_logged_in) {
 438                 pr_err("Missing tfo->sess_logged_in()\n");
 439                 return -EINVAL;
 440         }
 441         if (!tfo->sess_get_index) {
 442                 pr_err("Missing tfo->sess_get_index()\n");
 443                 return -EINVAL;
 444         }
 445         if (!tfo->write_pending) {
 446                 pr_err("Missing tfo->write_pending()\n");
 447                 return -EINVAL;
 448         }
 449         if (!tfo->write_pending_status) {
 450                 pr_err("Missing tfo->write_pending_status()\n");
 451                 return -EINVAL;
 452         }
 453         if (!tfo->set_default_node_attributes) {
 454                 pr_err("Missing tfo->set_default_node_attributes()\n");
 455                 return -EINVAL;
 456         }
 457         if (!tfo->get_task_tag) {
 458                 pr_err("Missing tfo->get_task_tag()\n");
 459                 return -EINVAL;
 460         }
 461         if (!tfo->get_cmd_state) {
 462                 pr_err("Missing tfo->get_cmd_state()\n");
 463                 return -EINVAL;
 464         }
 465         if (!tfo->queue_data_in) {
 466                 pr_err("Missing tfo->queue_data_in()\n");
 467                 return -EINVAL;
 468         }
 469         if (!tfo->queue_status) {
 470                 pr_err("Missing tfo->queue_status()\n");
 471                 return -EINVAL;
 472         }
 473         if (!tfo->queue_tm_rsp) {
 474                 pr_err("Missing tfo->queue_tm_rsp()\n");
 475                 return -EINVAL;
 476         }
 477         if (!tfo->set_fabric_sense_len) {
 478                 pr_err("Missing tfo->set_fabric_sense_len()\n");
 479                 return -EINVAL;
 480         }
 481         if (!tfo->get_fabric_sense_len) {
 482                 pr_err("Missing tfo->get_fabric_sense_len()\n");
 483                 return -EINVAL;
 484         }
 485         if (!tfo->is_state_remove) {
 486                 pr_err("Missing tfo->is_state_remove()\n");
 487                 return -EINVAL;
 488         }
 489         /*
 490          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 491          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
 492          * target_core_fabric_configfs.c WWN+TPG group context code.
 493          */
 494         if (!tfo->fabric_make_wwn) {
 495                 pr_err("Missing tfo->fabric_make_wwn()\n");
 496                 return -EINVAL;
 497         }
 498         if (!tfo->fabric_drop_wwn) {
 499                 pr_err("Missing tfo->fabric_drop_wwn()\n");
 500                 return -EINVAL;
 501         }
 502         if (!tfo->fabric_make_tpg) {
 503                 pr_err("Missing tfo->fabric_make_tpg()\n");
 504                 return -EINVAL;
 505         }
 506         if (!tfo->fabric_drop_tpg) {
 507                 pr_err("Missing tfo->fabric_drop_tpg()\n");
 508                 return -EINVAL;
 509         }
 510
 511         return 0;
 512 }
 513
 514 /*
 515  * Called 2nd from fabric module with returned parameter of
 516  * struct target_fabric_configfs * from target_fabric_configfs_init().
 517  *
 518  * Upon a successful registration, the new fabric's struct config_item is
 519  * return.  Also, a pointer to this struct is set in the passed
 520  * struct target_fabric_configfs.
 521  */
 522 int target_fabric_configfs_register(
 523         struct target_fabric_configfs *tf)
 524 {
 525         int ret;
 526
 527         if (!tf) {
 528                 pr_err("Unable to locate target_fabric_configfs"
 529                         " pointer\n");
 530                 return -EINVAL;
 531         }
 532         if (!tf->tf_subsys) {
 533                 pr_err("Unable to target struct config_subsystem"
 534                         " pointer\n");
 535                 return -EINVAL;
 536         }
 537         ret = target_fabric_tf_ops_check(tf);
 538         if (ret < 0)
 539                 return ret;
 540
 541         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
 542                 ">>>>>>>>>>\n");
 543         return 0;
 544 }
 545 EXPORT_SYMBOL(target_fabric_configfs_register);
 546
 547 void target_fabric_configfs_deregister(
 548         struct target_fabric_configfs *tf)
 549 {
 550         struct configfs_subsystem *su;
 551
 552         if (!tf) {
 553                 pr_err("Unable to locate passed target_fabric_"
 554                         "configfs\n");
 555                 return;
 556         }
 557         su = tf->tf_subsys;
 558         if (!su) {
 559                 pr_err("Unable to locate passed tf->tf_subsys"
 560                         " pointer\n");
 561                 return;
 562         }
 563         pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
 564                         ">>>>>>>>>>>>\n");
 565         mutex_lock(&g_tf_lock);
 566         if (atomic_read(&tf->tf_access_cnt)) {
 567                 mutex_unlock(&g_tf_lock);
 568                 pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
 569                         tf->tf_name);
 570                 BUG();
 571         }
 572         list_del(&tf->tf_list);
 573         mutex_unlock(&g_tf_lock);
 574
 575         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
 576                         " %s\n", tf->tf_name);
 577         tf->tf_module = NULL;
 578         tf->tf_subsys = NULL;
 579         kfree(tf);
 580
 581         pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
 582                         ">>>>>\n");
 583 }
 584 EXPORT_SYMBOL(target_fabric_configfs_deregister);
 585
 586 /*##############################################################################
 587 // Stop functions called by external Target Fabrics Modules
 588 //############################################################################*/
 589
 590 /* Start functions for struct config_item_type target_core_dev_attrib_cit */
 591
 592 #define DEF_DEV_ATTRIB_SHOW(_name)                                      \
 593 static ssize_t target_core_dev_show_attr_##_name(                       \
 594         struct se_dev_attrib *da,                                       \
 595         char *page)                                                     \
 596 {                                                                       \
 597         struct se_device *dev;                                          \
 598         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 599         ssize_t rb;                                                     \
 600                                                                         \
 601         spin_lock(&se_dev->se_dev_lock);                                \
 602         dev = se_dev->se_dev_ptr;                                       \
 603         if (!dev) {                                                     \
 604                 spin_unlock(&se_dev->se_dev_lock);                      \
 605                 return -ENODEV;                                         \
 606         }                                                               \
 607         rb = snprintf(page, PAGE_SIZE, "%u\n",                          \
 608                 (u32)dev->se_sub_dev->se_dev_attrib._name);             \
 609         spin_unlock(&se_dev->se_dev_lock);                              \
 610                                                                         \
 611         return rb;                                                      \
 612 }
 613
 614 #define DEF_DEV_ATTRIB_STORE(_name)                                     \
 615 static ssize_t target_core_dev_store_attr_##_name(                      \
 616         struct se_dev_attrib *da,                                       \
 617         const char *page,                                               \
 618         size_t count)                                                   \
 619 {                                                                       \
 620         struct se_device *dev;                                          \
 621         struct se_subsystem_dev *se_dev = da->da_sub_dev;                       \
 622         unsigned long val;                                              \
 623         int ret;                                                        \
 624                                                                         \
 625         spin_lock(&se_dev->se_dev_lock);                                \
 626         dev = se_dev->se_dev_ptr;                                       \
 627         if (!dev) {                                                     \
 628                 spin_unlock(&se_dev->se_dev_lock);                      \
 629                 return -ENODEV;                                         \
 630         }                                                               \
 631         ret = strict_strtoul(page, 0, &val);                            \
 632         if (ret < 0) {                                                  \
 633                 spin_unlock(&se_dev->se_dev_lock);                      \
 634                 pr_err("strict_strtoul() failed with"           \
 635                         " ret: %d\n", ret);                             \
 636                 return -EINVAL;                                         \
 637         }                                                               \
 638         ret = se_dev_set_##_name(dev, (u32)val);                        \
 639         spin_unlock(&se_dev->se_dev_lock);                              \
 640                                                                         \
 641         return (!ret) ? count : -EINVAL;                                \
 642 }
 643
 644 #define DEF_DEV_ATTRIB(_name)                                           \
 645 DEF_DEV_ATTRIB_SHOW(_name);                                             \
 646 DEF_DEV_ATTRIB_STORE(_name);
 647
 648 #define DEF_DEV_ATTRIB_RO(_name)                                        \
 649 DEF_DEV_ATTRIB_SHOW(_name);
 650
 651 CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
 652 #define SE_DEV_ATTR(_name, _mode)                                       \
 653 static struct target_core_dev_attrib_attribute                          \
 654                         target_core_dev_attrib_##_name =                \
 655                 __CONFIGFS_EATTR(_name, _mode,                          \
 656                 target_core_dev_show_attr_##_name,                      \
 657                 target_core_dev_store_attr_##_name);
 658
 659 #define SE_DEV_ATTR_RO(_name);                                          \
 660 static struct target_core_dev_attrib_attribute                          \
 661                         target_core_dev_attrib_##_name =                \
 662         __CONFIGFS_EATTR_RO(_name,                                      \
 663         target_core_dev_show_attr_##_name);
 664
 665 DEF_DEV_ATTRIB(emulate_dpo);
 666 SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
 667
 668 DEF_DEV_ATTRIB(emulate_fua_write);
 669 SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);
 670
 671 DEF_DEV_ATTRIB(emulate_fua_read);
 672 SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);
 673
 674 DEF_DEV_ATTRIB(emulate_write_cache);
 675 SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);
 676
 677 DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
 678 SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
 679
 680 DEF_DEV_ATTRIB(emulate_tas);
 681 SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
 682
 683 DEF_DEV_ATTRIB(emulate_tpu);
 684 SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
 685
 686 DEF_DEV_ATTRIB(emulate_tpws);
 687 SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
 688
 689 DEF_DEV_ATTRIB(enforce_pr_isids);
 690 SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
 691
 692 DEF_DEV_ATTRIB(is_nonrot);
 693 SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
 694
 695 DEF_DEV_ATTRIB(emulate_rest_reord);
 696 SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);
 697
 698 DEF_DEV_ATTRIB_RO(hw_block_size);
 699 SE_DEV_ATTR_RO(hw_block_size);
 700
 701 DEF_DEV_ATTRIB(block_size);
 702 SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
 703
 704 DEF_DEV_ATTRIB_RO(hw_max_sectors);
 705 SE_DEV_ATTR_RO(hw_max_sectors);
 706
 707 DEF_DEV_ATTRIB(max_sectors);
 708 SE_DEV_ATTR(max_sectors, S_IRUGO | S_IWUSR);
 709
 710 DEF_DEV_ATTRIB(optimal_sectors);
 711 SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);
 712
 713 DEF_DEV_ATTRIB_RO(hw_queue_depth);
 714 SE_DEV_ATTR_RO(hw_queue_depth);
 715
 716 DEF_DEV_ATTRIB(queue_depth);
 717 SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
 718
 719 DEF_DEV_ATTRIB(max_unmap_lba_count);
 720 SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
 721
 722 DEF_DEV_ATTRIB(max_unmap_block_desc_count);
 723 SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);
 724
 725 DEF_DEV_ATTRIB(unmap_granularity);
 726 SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
 727
 728 DEF_DEV_ATTRIB(unmap_granularity_alignment);
 729 SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
 730
 731 CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
 732
 733 static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
 734         &target_core_dev_attrib_emulate_dpo.attr,
 735         &target_core_dev_attrib_emulate_fua_write.attr,
 736         &target_core_dev_attrib_emulate_fua_read.attr,
 737         &target_core_dev_attrib_emulate_write_cache.attr,
 738         &target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
 739         &target_core_dev_attrib_emulate_tas.attr,
 740         &target_core_dev_attrib_emulate_tpu.attr,
 741         &target_core_dev_attrib_emulate_tpws.attr,
 742         &target_core_dev_attrib_enforce_pr_isids.attr,
 743         &target_core_dev_attrib_is_nonrot.attr,
 744         &target_core_dev_attrib_emulate_rest_reord.attr,
 745         &target_core_dev_attrib_hw_block_size.attr,
 746         &target_core_dev_attrib_block_size.attr,
 747         &target_core_dev_attrib_hw_max_sectors.attr,
 748         &target_core_dev_attrib_max_sectors.attr,
 749         &target_core_dev_attrib_optimal_sectors.attr,
 750         &target_core_dev_attrib_hw_queue_depth.attr,
 751         &target_core_dev_attrib_queue_depth.attr,
 752         &target_core_dev_attrib_max_unmap_lba_count.attr,
 753         &target_core_dev_attrib_max_unmap_block_desc_count.attr,
 754         &target_core_dev_attrib_unmap_granularity.attr,
 755         &target_core_dev_attrib_unmap_granularity_alignment.attr,
 756         NULL,
 757 };
 758
 759 static struct configfs_item_operations target_core_dev_attrib_ops = {
 760         .show_attribute         = target_core_dev_attrib_attr_show,
 761         .store_attribute        = target_core_dev_attrib_attr_store,
 762 };
 763
 764 static struct config_item_type target_core_dev_attrib_cit = {
 765         .ct_item_ops            = &target_core_dev_attrib_ops,
 766         .ct_attrs               = target_core_dev_attrib_attrs,
 767         .ct_owner               = THIS_MODULE,
 768 };
 769
 770 /* End functions for struct config_item_type target_core_dev_attrib_cit */
 771
 772 /*  Start functions for struct config_item_type target_core_dev_wwn_cit */
 773
 774 CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
 775 #define SE_DEV_WWN_ATTR(_name, _mode)                                   \
 776 static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
 777                 __CONFIGFS_EATTR(_name, _mode,                          \
 778                 target_core_dev_wwn_show_attr_##_name,                  \
 779                 target_core_dev_wwn_store_attr_##_name);
 780
 781 #define SE_DEV_WWN_ATTR_RO(_name);                                      \
 782 do {                                                                    \
 783         static struct target_core_dev_wwn_attribute                     \
 784                         target_core_dev_wwn_##_name =                   \
 785                 __CONFIGFS_EATTR_RO(_name,                              \
 786                 target_core_dev_wwn_show_attr_##_name);                 \
 787 } while (0);
 788
 789 /*
 790  * VPD page 0x80 Unit serial
 791  */
 792 static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
 793         struct t10_wwn *t10_wwn,
 794         char *page)
 795 {
 796         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 797         struct se_device *dev;
 798
 799         dev = se_dev->se_dev_ptr;
 800         if (!dev)
 801                 return -ENODEV;
 802
 803         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
 804                 &t10_wwn->unit_serial[0]);
 805 }
 806
 807 static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
 808         struct t10_wwn *t10_wwn,
 809         const char *page,
 810         size_t count)
 811 {
 812         struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
 813         struct se_device *dev;
 814         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
 815
 816         /*
 817          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
 818          * from the struct scsi_device level firmware, do not allow
 819          * VPD Unit Serial to be emulated.
 820          *
 821          * Note this struct scsi_device could also be emulating VPD
 822          * information from its drivers/scsi LLD.  But for now we assume
 823          * it is doing 'the right thing' wrt a world wide unique
 824          * VPD Unit Serial Number that OS dependent multipath can depend on.
 825          */
 826         if (su_dev->su_dev_flags & SDF_FIRMWARE_VPD_UNIT_SERIAL) {
 827                 pr_err("Underlying SCSI device firmware provided VPD"
 828                         " Unit Serial, ignoring request\n");
 829                 return -EOPNOTSUPP;
 830         }
 831
 832         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
 833                 pr_err("Emulated VPD Unit Serial exceeds"
 834                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
 835                 return -EOVERFLOW;
 836         }
 837         /*
 838          * Check to see if any active $FABRIC_MOD exports exist.  If they
 839          * do exist, fail here as changing this information on the fly
 840          * (underneath the initiator side OS dependent multipath code)
 841          * could cause negative effects.
 842          */
 843         dev = su_dev->se_dev_ptr;
 844         if (dev) {
 845                 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
 846                         pr_err("Unable to set VPD Unit Serial while"
 847                                 " active %d $FABRIC_MOD exports exist\n",
 848                                 atomic_read(&dev->dev_export_obj.obj_access_count));
 849                         return -EINVAL;
 850                 }
 851         }
 852         /*
 853          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
 854          *
 855          * Also, strip any newline added from the userspace
 856          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
 857          */
 858         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
 859         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
 860         snprintf(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
 861                         "%s", strstrip(buf));
 862         su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;
 863
 864         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
 865                         " %s\n", su_dev->t10_wwn.unit_serial);
 866
 867         return count;
 868 }
 869
 870 SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);
 871
 872 /*
 873  * VPD page 0x83 Protocol Identifier
 874  */
 875 static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
 876         struct t10_wwn *t10_wwn,
 877         char *page)
 878 {
 879         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
 880         struct se_device *dev;
 881         struct t10_vpd *vpd;
 882         unsigned char buf[VPD_TMP_BUF_SIZE];
 883         ssize_t len = 0;
 884
 885         dev = se_dev->se_dev_ptr;
 886         if (!dev)
 887                 return -ENODEV;
 888
 889         memset(buf, 0, VPD_TMP_BUF_SIZE);
 890
 891         spin_lock(&t10_wwn->t10_vpd_lock);
 892         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
 893                 if (!vpd->protocol_identifier_set)
 894                         continue;
 895
 896                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
 897
 898                 if (len + strlen(buf) >= PAGE_SIZE)
 899                         break;
 900
 901                 len += sprintf(page+len, "%s", buf);
 902         }
 903         spin_unlock(&t10_wwn->t10_vpd_lock);
 904
 905         return len;
 906 }
 907
 908 static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
 909         struct t10_wwn *t10_wwn,
 910         const char *page,
 911         size_t count)
 912 {
 913         return -ENOSYS;
 914 }
 915
 916 SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);
 917
 918 /*
 919  * Generic wrapper for dumping VPD identifiers by association.
 920  */
 921 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
 922 static ssize_t target_core_dev_wwn_show_attr_##_name(                   \
 923         struct t10_wwn *t10_wwn,                                        \
 924         char *page)                                                     \
 925 {                                                                       \
 926         struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;         \
 927         struct se_device *dev;                                          \
 928         struct t10_vpd *vpd;                                                    \
 929         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
 930         ssize_t len = 0;                                                \
 931                                                                         \
 932         dev = se_dev->se_dev_ptr;                                       \
 933         if (!dev)                                                       \
 934                 return -ENODEV;                                         \
 935                                                                         \
 936         spin_lock(&t10_wwn->t10_vpd_lock);                              \
 937         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
 938                 if (vpd->association != _assoc)                         \
 939                         continue;                                       \
 940                                                                         \
 941                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 942                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
 943                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 944                         break;                                          \
 945                 len += sprintf(page+len, "%s", buf);                    \
 946                                                                         \
 947                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 948                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
 949                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 950                         break;                                          \
 951                 len += sprintf(page+len, "%s", buf);                    \
 952                                                                         \
 953                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
 954                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
 955                 if (len + strlen(buf) >= PAGE_SIZE)                     \
 956                         break;                                          \
 957                 len += sprintf(page+len, "%s", buf);                    \
 958         }                                                               \
 959         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
 960                                                                         \
 961         return len;                                                     \
 962 }
 963
 964 /*
 965  * VPD page 0x83 Association: Logical Unit
 966  */
 967 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
 968
 969 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
 970         struct t10_wwn *t10_wwn,
 971         const char *page,
 972         size_t count)
 973 {
 974         return -ENOSYS;
 975 }
 976
 977 SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);
 978
 979 /*
 980  * VPD page 0x83 Association: Target Port
 981  */
 982 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
 983
 984 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
 985         struct t10_wwn *t10_wwn,
 986         const char *page,
 987         size_t count)
 988 {
 989         return -ENOSYS;
 990 }
 991
 992 SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);
 993
 994 /*
 995  * VPD page 0x83 Association: SCSI Target Device
 996  */
 997 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
 998
 999 static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
1000         struct t10_wwn *t10_wwn,
1001         const char *page,
1002         size_t count)
1003 {
1004         return -ENOSYS;
1005 }
1006
1007 SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);
1008
1009 CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);
1010
1011 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1012         &target_core_dev_wwn_vpd_unit_serial.attr,
1013         &target_core_dev_wwn_vpd_protocol_identifier.attr,
1014         &target_core_dev_wwn_vpd_assoc_logical_unit.attr,
1015         &target_core_dev_wwn_vpd_assoc_target_port.attr,
1016         &target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
1017         NULL,
1018 };
1019
1020 static struct configfs_item_operations target_core_dev_wwn_ops = {
1021         .show_attribute         = target_core_dev_wwn_attr_show,
1022         .store_attribute        = target_core_dev_wwn_attr_store,
1023 };
1024
1025 static struct config_item_type target_core_dev_wwn_cit = {
1026         .ct_item_ops            = &target_core_dev_wwn_ops,
1027         .ct_attrs               = target_core_dev_wwn_attrs,
1028         .ct_owner               = THIS_MODULE,
1029 };
1030
1031 /*  End functions for struct config_item_type target_core_dev_wwn_cit */
1032
1033 /*  Start functions for struct config_item_type target_core_dev_pr_cit */
1034
1035 CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_subsystem_dev);
1036 #define SE_DEV_PR_ATTR(_name, _mode)                                    \
1037 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1038         __CONFIGFS_EATTR(_name, _mode,                                  \
1039         target_core_dev_pr_show_attr_##_name,                           \
1040         target_core_dev_pr_store_attr_##_name);
1041
1042 #define SE_DEV_PR_ATTR_RO(_name);                                       \
1043 static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
1044         __CONFIGFS_EATTR_RO(_name,                                      \
1045         target_core_dev_pr_show_attr_##_name);
1046
1047 /*
1048  * res_holder
1049  */
1050 static ssize_t target_core_dev_pr_show_spc3_res(
1051         struct se_device *dev,
1052         char *page,
1053         ssize_t *len)
1054 {
1055         struct se_node_acl *se_nacl;
1056         struct t10_pr_registration *pr_reg;
1057         char i_buf[PR_REG_ISID_ID_LEN];
1058         int prf_isid;
1059
1060         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1061
1062         spin_lock(&dev->dev_reservation_lock);
1063         pr_reg = dev->dev_pr_res_holder;
1064         if (!pr_reg) {
1065                 *len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
1066                 spin_unlock(&dev->dev_reservation_lock);
1067                 return *len;
1068         }
1069         se_nacl = pr_reg->pr_reg_nacl;
1070         prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1071                                 PR_REG_ISID_ID_LEN);
1072
1073         *len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
1074                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1075                 se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
1076         spin_unlock(&dev->dev_reservation_lock);
1077
1078         return *len;
1079 }
1080
1081 static ssize_t target_core_dev_pr_show_spc2_res(
1082         struct se_device *dev,
1083         char *page,
1084         ssize_t *len)
1085 {
1086         struct se_node_acl *se_nacl;
1087
1088         spin_lock(&dev->dev_reservation_lock);
1089         se_nacl = dev->dev_reserved_node_acl;
1090         if (!se_nacl) {
1091                 *len += sprintf(page + *len, "No SPC-2 Reservation holder\n");
1092                 spin_unlock(&dev->dev_reservation_lock);
1093                 return *len;
1094         }
1095         *len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",
1096                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1097                 se_nacl->initiatorname);
1098         spin_unlock(&dev->dev_reservation_lock);
1099
1100         return *len;
1101 }
1102
1103 static ssize_t target_core_dev_pr_show_attr_res_holder(
1104         struct se_subsystem_dev *su_dev,
1105         char *page)
1106 {
1107         ssize_t len = 0;
1108
1109         if (!su_dev->se_dev_ptr)
1110                 return -ENODEV;
1111
1112         switch (su_dev->t10_pr.res_type) {
1113         case SPC3_PERSISTENT_RESERVATIONS:
1114                 target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
1115                                 page, &len);
1116                 break;
1117         case SPC2_RESERVATIONS:
1118                 target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
1119                                 page, &len);
1120                 break;
1121         case SPC_PASSTHROUGH:
1122                 len += sprintf(page+len, "Passthrough\n");
1123                 break;
1124         default:
1125                 len += sprintf(page+len, "Unknown\n");
1126                 break;
1127         }
1128
1129         return len;
1130 }
1131
1132 SE_DEV_PR_ATTR_RO(res_holder);
1133
1134 /*
1135  * res_pr_all_tgt_pts
1136  */
1137 static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
1138         struct se_subsystem_dev *su_dev,
1139         char *page)
1140 {
1141         struct se_device *dev;
1142         struct t10_pr_registration *pr_reg;
1143         ssize_t len = 0;
1144
1145         dev = su_dev->se_dev_ptr;
1146         if (!dev)
1147                 return -ENODEV;
1148
1149         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1150                 return len;
1151
1152         spin_lock(&dev->dev_reservation_lock);
1153         pr_reg = dev->dev_pr_res_holder;
1154         if (!pr_reg) {
1155                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1156                 spin_unlock(&dev->dev_reservation_lock);
1157                 return len;
1158         }
1159         /*
1160          * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
1161          * Basic PERSISTENT RESERVER OUT parameter list, page 290
1162          */
1163         if (pr_reg->pr_reg_all_tg_pt)
1164                 len = sprintf(page, "SPC-3 Reservation: All Target"
1165                         " Ports registration\n");
1166         else
1167                 len = sprintf(page, "SPC-3 Reservation: Single"
1168                         " Target Port registration\n");
1169         spin_unlock(&dev->dev_reservation_lock);
1170
1171         return len;
1172 }
1173
1174 SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);
1175
1176 /*
1177  * res_pr_generation
1178  */
1179 static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
1180         struct se_subsystem_dev *su_dev,
1181         char *page)
1182 {
1183         if (!su_dev->se_dev_ptr)
1184                 return -ENODEV;
1185
1186         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1187                 return 0;
1188
1189         return sprintf(page, "0x%08x\n", su_dev->t10_pr.pr_generation);
1190 }
1191
1192 SE_DEV_PR_ATTR_RO(res_pr_generation);
1193
1194 /*
1195  * res_pr_holder_tg_port
1196  */
1197 static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
1198         struct se_subsystem_dev *su_dev,
1199         char *page)
1200 {
1201         struct se_device *dev;
1202         struct se_node_acl *se_nacl;
1203         struct se_lun *lun;
1204         struct se_portal_group *se_tpg;
1205         struct t10_pr_registration *pr_reg;
1206         struct target_core_fabric_ops *tfo;
1207         ssize_t len = 0;
1208
1209         dev = su_dev->se_dev_ptr;
1210         if (!dev)
1211                 return -ENODEV;
1212
1213         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1214                 return len;
1215
1216         spin_lock(&dev->dev_reservation_lock);
1217         pr_reg = dev->dev_pr_res_holder;
1218         if (!pr_reg) {
1219                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1220                 spin_unlock(&dev->dev_reservation_lock);
1221                 return len;
1222         }
1223         se_nacl = pr_reg->pr_reg_nacl;
1224         se_tpg = se_nacl->se_tpg;
1225         lun = pr_reg->pr_reg_tg_pt_lun;
1226         tfo = se_tpg->se_tpg_tfo;
1227
1228         len += sprintf(page+len, "SPC-3 Reservation: %s"
1229                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1230                 tfo->tpg_get_wwn(se_tpg));
1231         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1232                 " Identifer Tag: %hu %s Portal Group Tag: %hu"
1233                 " %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
1234                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1235                 tfo->get_fabric_name(), lun->unpacked_lun);
1236         spin_unlock(&dev->dev_reservation_lock);
1237
1238         return len;
1239 }
1240
1241 SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);
1242
1243 /*
1244  * res_pr_registered_i_pts
1245  */
1246 static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
1247         struct se_subsystem_dev *su_dev,
1248         char *page)
1249 {
1250         struct target_core_fabric_ops *tfo;
1251         struct t10_pr_registration *pr_reg;
1252         unsigned char buf[384];
1253         char i_buf[PR_REG_ISID_ID_LEN];
1254         ssize_t len = 0;
1255         int reg_count = 0, prf_isid;
1256
1257         if (!su_dev->se_dev_ptr)
1258                 return -ENODEV;
1259
1260         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1261                 return len;
1262
1263         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1264
1265         spin_lock(&su_dev->t10_pr.registration_lock);
1266         list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
1267                         pr_reg_list) {
1268
1269                 memset(buf, 0, 384);
1270                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1271                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1272                 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
1273                                         PR_REG_ISID_ID_LEN);
1274                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1275                         tfo->get_fabric_name(),
1276                         pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
1277                         &i_buf[0] : "", pr_reg->pr_res_key,
1278                         pr_reg->pr_res_generation);
1279
1280                 if (len + strlen(buf) >= PAGE_SIZE)
1281                         break;
1282
1283                 len += sprintf(page+len, "%s", buf);
1284                 reg_count++;
1285         }
1286         spin_unlock(&su_dev->t10_pr.registration_lock);
1287
1288         if (!reg_count)
1289                 len += sprintf(page+len, "None\n");
1290
1291         return len;
1292 }
1293
1294 SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);
1295
1296 /*
1297  * res_pr_type
1298  */
1299 static ssize_t target_core_dev_pr_show_attr_res_pr_type(
1300         struct se_subsystem_dev *su_dev,
1301         char *page)
1302 {
1303         struct se_device *dev;
1304         struct t10_pr_registration *pr_reg;
1305         ssize_t len = 0;
1306
1307         dev = su_dev->se_dev_ptr;
1308         if (!dev)
1309                 return -ENODEV;
1310
1311         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1312                 return len;
1313
1314         spin_lock(&dev->dev_reservation_lock);
1315         pr_reg = dev->dev_pr_res_holder;
1316         if (!pr_reg) {
1317                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1318                 spin_unlock(&dev->dev_reservation_lock);
1319                 return len;
1320         }
1321         len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1322                 core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1323         spin_unlock(&dev->dev_reservation_lock);
1324
1325         return len;
1326 }
1327
1328 SE_DEV_PR_ATTR_RO(res_pr_type);
1329
1330 /*
1331  * res_type
1332  */
1333 static ssize_t target_core_dev_pr_show_attr_res_type(
1334         struct se_subsystem_dev *su_dev,
1335         char *page)
1336 {
1337         ssize_t len = 0;
1338
1339         if (!su_dev->se_dev_ptr)
1340                 return -ENODEV;
1341
1342         switch (su_dev->t10_pr.res_type) {
1343         case SPC3_PERSISTENT_RESERVATIONS:
1344                 len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1345                 break;
1346         case SPC2_RESERVATIONS:
1347                 len = sprintf(page, "SPC2_RESERVATIONS\n");
1348                 break;
1349         case SPC_PASSTHROUGH:
1350                 len = sprintf(page, "SPC_PASSTHROUGH\n");
1351                 break;
1352         default:
1353                 len = sprintf(page, "UNKNOWN\n");
1354                 break;
1355         }
1356
1357         return len;
1358 }
1359
1360 SE_DEV_PR_ATTR_RO(res_type);
1361
1362 /*
1363  * res_aptpl_active
1364  */
1365
1366 static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
1367         struct se_subsystem_dev *su_dev,
1368         char *page)
1369 {
1370         if (!su_dev->se_dev_ptr)
1371                 return -ENODEV;
1372
1373         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1374                 return 0;
1375
1376         return sprintf(page, "APTPL Bit Status: %s\n",
1377                 (su_dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1378 }
1379
1380 SE_DEV_PR_ATTR_RO(res_aptpl_active);
1381
1382 /*
1383  * res_aptpl_metadata
1384  */
1385 static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
1386         struct se_subsystem_dev *su_dev,
1387         char *page)
1388 {
1389         if (!su_dev->se_dev_ptr)
1390                 return -ENODEV;
1391
1392         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1393                 return 0;
1394
1395         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1396 }
1397
1398 enum {
1399         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1400         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1401         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1402         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1403 };
1404
1405 static match_table_t tokens = {
1406         {Opt_initiator_fabric, "initiator_fabric=%s"},
1407         {Opt_initiator_node, "initiator_node=%s"},
1408         {Opt_initiator_sid, "initiator_sid=%s"},
1409         {Opt_sa_res_key, "sa_res_key=%s"},
1410         {Opt_res_holder, "res_holder=%d"},
1411         {Opt_res_type, "res_type=%d"},
1412         {Opt_res_scope, "res_scope=%d"},
1413         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1414         {Opt_mapped_lun, "mapped_lun=%d"},
1415         {Opt_target_fabric, "target_fabric=%s"},
1416         {Opt_target_node, "target_node=%s"},
1417         {Opt_tpgt, "tpgt=%d"},
1418         {Opt_port_rtpi, "port_rtpi=%d"},
1419         {Opt_target_lun, "target_lun=%d"},
1420         {Opt_err, NULL}
1421 };
1422
1423 static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
1424         struct se_subsystem_dev *su_dev,
1425         const char *page,
1426         size_t count)
1427 {
1428         struct se_device *dev;
1429         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1430         unsigned char *t_fabric = NULL, *t_port = NULL;
1431         char *orig, *ptr, *arg_p, *opts;
1432         substring_t args[MAX_OPT_ARGS];
1433         unsigned long long tmp_ll;
1434         u64 sa_res_key = 0;
1435         u32 mapped_lun = 0, target_lun = 0;
1436         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1437         u16 port_rpti = 0, tpgt = 0;
1438         u8 type = 0, scope;
1439
1440         dev = su_dev->se_dev_ptr;
1441         if (!dev)
1442                 return -ENODEV;
1443
1444         if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
1445                 return 0;
1446
1447         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1448                 pr_debug("Unable to process APTPL metadata while"
1449                         " active fabric exports exist\n");
1450                 return -EINVAL;
1451         }
1452
1453         opts = kstrdup(page, GFP_KERNEL);
1454         if (!opts)
1455                 return -ENOMEM;
1456
1457         orig = opts;
1458         while ((ptr = strsep(&opts, ",")) != NULL) {
1459                 if (!*ptr)
1460                         continue;
1461
1462                 token = match_token(ptr, tokens, args);
1463                 switch (token) {
1464                 case Opt_initiator_fabric:
1465                         i_fabric = match_strdup(&args[0]);
1466                         if (!i_fabric) {
1467                                 ret = -ENOMEM;
1468                                 goto out;
1469                         }
1470                         break;
1471                 case Opt_initiator_node:
1472                         i_port = match_strdup(&args[0]);
1473                         if (!i_port) {
1474                                 ret = -ENOMEM;
1475                                 goto out;
1476                         }
1477                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1478                                 pr_err("APTPL metadata initiator_node="
1479                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1480                                         PR_APTPL_MAX_IPORT_LEN);
1481                                 ret = -EINVAL;
1482                                 break;
1483                         }
1484                         break;
1485                 case Opt_initiator_sid:
1486                         isid = match_strdup(&args[0]);
1487                         if (!isid) {
1488                                 ret = -ENOMEM;
1489                                 goto out;
1490                         }
1491                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1492                                 pr_err("APTPL metadata initiator_isid"
1493                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1494                                         PR_REG_ISID_LEN);
1495                                 ret = -EINVAL;
1496                                 break;
1497                         }
1498                         break;
1499                 case Opt_sa_res_key:
1500                         arg_p = match_strdup(&args[0]);
1501                         if (!arg_p) {
1502                                 ret = -ENOMEM;
1503                                 goto out;
1504                         }
1505                         ret = strict_strtoull(arg_p, 0, &tmp_ll);
1506                         if (ret < 0) {
1507                                 pr_err("strict_strtoull() failed for"
1508                                         " sa_res_key=\n");
1509                                 goto out;
1510                         }
1511                         sa_res_key = (u64)tmp_ll;
1512                         break;
1513                 /*
1514                  * PR APTPL Metadata for Reservation
1515                  */
1516                 case Opt_res_holder:
1517                         match_int(args, &arg);
1518                         res_holder = arg;
1519                         break;
1520                 case Opt_res_type:
1521                         match_int(args, &arg);
1522                         type = (u8)arg;
1523                         break;
1524                 case Opt_res_scope:
1525                         match_int(args, &arg);
1526                         scope = (u8)arg;
1527                         break;
1528                 case Opt_res_all_tg_pt:
1529                         match_int(args, &arg);
1530                         all_tg_pt = (int)arg;
1531                         break;
1532                 case Opt_mapped_lun:
1533                         match_int(args, &arg);
1534                         mapped_lun = (u32)arg;
1535                         break;
1536                 /*
1537                  * PR APTPL Metadata for Target Port
1538                  */
1539                 case Opt_target_fabric:
1540                         t_fabric = match_strdup(&args[0]);
1541                         if (!t_fabric) {
1542                                 ret = -ENOMEM;
1543                                 goto out;
1544                         }
1545                         break;
1546                 case Opt_target_node:
1547                         t_port = match_strdup(&args[0]);
1548                         if (!t_port) {
1549                                 ret = -ENOMEM;
1550                                 goto out;
1551                         }
1552                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1553                                 pr_err("APTPL metadata target_node="
1554                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1555                                         PR_APTPL_MAX_TPORT_LEN);
1556                                 ret = -EINVAL;
1557                                 break;
1558                         }
1559                         break;
1560                 case Opt_tpgt:
1561                         match_int(args, &arg);
1562                         tpgt = (u16)arg;
1563                         break;
1564                 case Opt_port_rtpi:
1565                         match_int(args, &arg);
1566                         port_rpti = (u16)arg;
1567                         break;
1568                 case Opt_target_lun:
1569                         match_int(args, &arg);
1570                         target_lun = (u32)arg;
1571                         break;
1572                 default:
1573                         break;
1574                 }
1575         }
1576
1577         if (!i_port || !t_port || !sa_res_key) {
1578                 pr_err("Illegal parameters for APTPL registration\n");
1579                 ret = -EINVAL;
1580                 goto out;
1581         }
1582
1583         if (res_holder && !(type)) {
1584                 pr_err("Illegal PR type: 0x%02x for reservation"
1585                                 " holder\n", type);
1586                 ret = -EINVAL;
1587                 goto out;
1588         }
1589
1590         ret = core_scsi3_alloc_aptpl_registration(&su_dev->t10_pr, sa_res_key,
1591                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1592                         res_holder, all_tg_pt, type);
1593 out:
1594         kfree(i_fabric);
1595         kfree(i_port);
1596         kfree(isid);
1597         kfree(t_fabric);
1598         kfree(t_port);
1599         kfree(orig);
1600         return (ret == 0) ? count : ret;
1601 }
1602
1603 SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);
1604
1605 CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);
1606
1607 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1608         &target_core_dev_pr_res_holder.attr,
1609         &target_core_dev_pr_res_pr_all_tgt_pts.attr,
1610         &target_core_dev_pr_res_pr_generation.attr,
1611         &target_core_dev_pr_res_pr_holder_tg_port.attr,
1612         &target_core_dev_pr_res_pr_registered_i_pts.attr,
1613         &target_core_dev_pr_res_pr_type.attr,
1614         &target_core_dev_pr_res_type.attr,
1615         &target_core_dev_pr_res_aptpl_active.attr,
1616         &target_core_dev_pr_res_aptpl_metadata.attr,
1617         NULL,
1618 };
1619
1620 static struct configfs_item_operations target_core_dev_pr_ops = {
1621         .show_attribute         = target_core_dev_pr_attr_show,
1622         .store_attribute        = target_core_dev_pr_attr_store,
1623 };
1624
1625 static struct config_item_type target_core_dev_pr_cit = {
1626         .ct_item_ops            = &target_core_dev_pr_ops,
1627         .ct_attrs               = target_core_dev_pr_attrs,
1628         .ct_owner               = THIS_MODULE,
1629 };
1630
1631 /*  End functions for struct config_item_type target_core_dev_pr_cit */
1632
1633 /*  Start functions for struct config_item_type target_core_dev_cit */
1634
1635 static ssize_t target_core_show_dev_info(void *p, char *page)
1636 {
1637         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1638         struct se_hba *hba = se_dev->se_dev_hba;
1639         struct se_subsystem_api *t = hba->transport;
1640         int bl = 0;
1641         ssize_t read_bytes = 0;
1642
1643         if (!se_dev->se_dev_ptr)
1644                 return -ENODEV;
1645
1646         transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
1647         read_bytes += bl;
1648         read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
1649         return read_bytes;
1650 }
1651
1652 static struct target_core_configfs_attribute target_core_attr_dev_info = {
1653         .attr   = { .ca_owner = THIS_MODULE,
1654                     .ca_name = "info",
1655                     .ca_mode = S_IRUGO },
1656         .show   = target_core_show_dev_info,
1657         .store  = NULL,
1658 };
1659
1660 static ssize_t target_core_store_dev_control(
1661         void *p,
1662         const char *page,
1663         size_t count)
1664 {
1665         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1666         struct se_hba *hba = se_dev->se_dev_hba;
1667         struct se_subsystem_api *t = hba->transport;
1668
1669         if (!se_dev->se_dev_su_ptr) {
1670                 pr_err("Unable to locate struct se_subsystem_dev>se"
1671                                 "_dev_su_ptr\n");
1672                 return -EINVAL;
1673         }
1674
1675         return t->set_configfs_dev_params(hba, se_dev, page, count);
1676 }
1677
1678 static struct target_core_configfs_attribute target_core_attr_dev_control = {
1679         .attr   = { .ca_owner = THIS_MODULE,
1680                     .ca_name = "control",
1681                     .ca_mode = S_IWUSR },
1682         .show   = NULL,
1683         .store  = target_core_store_dev_control,
1684 };
1685
1686 static ssize_t target_core_show_dev_alias(void *p, char *page)
1687 {
1688         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1689
1690         if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
1691                 return 0;
1692
1693         return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_alias);
1694 }
1695
1696 static ssize_t target_core_store_dev_alias(
1697         void *p,
1698         const char *page,
1699         size_t count)
1700 {
1701         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1702         struct se_hba *hba = se_dev->se_dev_hba;
1703         ssize_t read_bytes;
1704
1705         if (count > (SE_DEV_ALIAS_LEN-1)) {
1706                 pr_err("alias count: %d exceeds"
1707                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1708                         SE_DEV_ALIAS_LEN-1);
1709                 return -EINVAL;
1710         }
1711
1712         se_dev->su_dev_flags |= SDF_USING_ALIAS;
1713         read_bytes = snprintf(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
1714                         "%s", page);
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 = (struct se_subsystem_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 = (struct se_subsystem_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         se_dev->su_dev_flags |= SDF_USING_UDEV_PATH;
1759         read_bytes = snprintf(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
1760                         "%s", page);
1761
1762         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1763                 config_item_name(&hba->hba_group.cg_item),
1764                 config_item_name(&se_dev->se_dev_group.cg_item),
1765                 se_dev->se_dev_udev_path);
1766
1767         return read_bytes;
1768 }
1769
1770 static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
1771         .attr   = { .ca_owner = THIS_MODULE,
1772                     .ca_name = "udev_path",
1773                     .ca_mode =  S_IRUGO | S_IWUSR },
1774         .show   = target_core_show_dev_udev_path,
1775         .store  = target_core_store_dev_udev_path,
1776 };
1777
1778 static ssize_t target_core_store_dev_enable(
1779         void *p,
1780         const char *page,
1781         size_t count)
1782 {
1783         struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
1784         struct se_device *dev;
1785         struct se_hba *hba = se_dev->se_dev_hba;
1786         struct se_subsystem_api *t = hba->transport;
1787         char *ptr;
1788
1789         ptr = strstr(page, "1");
1790         if (!ptr) {
1791                 pr_err("For dev_enable ops, only valid value"
1792                                 " is \"1\"\n");
1793                 return -EINVAL;
1794         }
1795         if (se_dev->se_dev_ptr) {
1796                 pr_err("se_dev->se_dev_ptr already set for storage"
1797                                 " object\n");
1798                 return -EEXIST;
1799         }
1800
1801         if (t->check_configfs_dev_params(hba, se_dev) < 0)
1802                 return -EINVAL;
1803
1804         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1805         if (IS_ERR(dev))
1806                 return PTR_ERR(dev);
1807         else if (!dev)
1808                 return -EINVAL;
1809
1810         se_dev->se_dev_ptr = dev;
1811         pr_debug("Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
1812                 " %p\n", se_dev->se_dev_ptr);
1813
1814         return count;
1815 }
1816
1817 static struct target_core_configfs_attribute target_core_attr_dev_enable = {
1818         .attr   = { .ca_owner = THIS_MODULE,
1819                     .ca_name = "enable",
1820                     .ca_mode = S_IWUSR },
1821         .show   = NULL,
1822         .store  = target_core_store_dev_enable,
1823 };
1824
1825 static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
1826 {
1827         struct se_device *dev;
1828         struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
1829         struct config_item *lu_ci;
1830         struct t10_alua_lu_gp *lu_gp;
1831         struct t10_alua_lu_gp_member *lu_gp_mem;
1832         ssize_t len = 0;
1833
1834         dev = su_dev->se_dev_ptr;
1835         if (!dev)
1836                 return -ENODEV;
1837
1838         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED)
1839                 return len;
1840
1841         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1842         if (!lu_gp_mem) {
1843                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1844                                 " pointer\n");
1845                 return -EINVAL;
1846         }
1847
1848         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1849         lu_gp = lu_gp_mem->lu_gp;
1850         if (lu_gp) {
1851                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1852                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1853                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1854         }
1855         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1856
1857         return len;
1858 }
1859
1860 static ssize_t target_core_store_alua_lu_gp(
1861         void *p,
1862         const char *page,
1863         size_t count)
1864 {
1865         struct se_device *dev;
1866         struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
1867         struct se_hba *hba = su_dev->se_dev_hba;
1868         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
1869         struct t10_alua_lu_gp_member *lu_gp_mem;
1870         unsigned char buf[LU_GROUP_NAME_BUF];
1871         int move = 0;
1872
1873         dev = su_dev->se_dev_ptr;
1874         if (!dev)
1875                 return -ENODEV;
1876
1877         if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
1878                 pr_warn("SPC3_ALUA_EMULATED not enabled for %s/%s\n",
1879                         config_item_name(&hba->hba_group.cg_item),
1880                         config_item_name(&su_dev->se_dev_group.cg_item));
1881                 return -EINVAL;
1882         }
1883         if (count > LU_GROUP_NAME_BUF) {
1884                 pr_err("ALUA LU Group Alias too large!\n");
1885                 return -EINVAL;
1886         }
1887         memset(buf, 0, LU_GROUP_NAME_BUF);
1888         memcpy(buf, page, count);
1889         /*
1890          * Any ALUA logical unit alias besides "NULL" means we will be
1891          * making a new group association.
1892          */
1893         if (strcmp(strstrip(buf), "NULL")) {
1894                 /*
1895                  * core_alua_get_lu_gp_by_name() will increment reference to
1896                  * struct t10_alua_lu_gp.  This reference is released with
1897                  * core_alua_get_lu_gp_by_name below().
1898                  */
1899                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
1900                 if (!lu_gp_new)
1901                         return -ENODEV;
1902         }
1903         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1904         if (!lu_gp_mem) {
1905                 if (lu_gp_new)
1906                         core_alua_put_lu_gp_from_name(lu_gp_new);
1907                 pr_err("NULL struct se_device->dev_alua_lu_gp_mem"
1908                                 " pointer\n");
1909                 return -EINVAL;
1910         }
1911
1912         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1913         lu_gp = lu_gp_mem->lu_gp;
1914         if (lu_gp) {
1915                 /*
1916                  * Clearing an existing lu_gp association, and replacing
1917                  * with NULL
1918                  */
1919                 if (!lu_gp_new) {
1920                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
1921                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
1922                                 " %hu\n",
1923                                 config_item_name(&hba->hba_group.cg_item),
1924                                 config_item_name(&su_dev->se_dev_group.cg_item),
1925                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
1926                                 lu_gp->lu_gp_id);
1927
1928                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1929                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1930
1931                         return count;
1932                 }
1933                 /*
1934                  * Removing existing association of lu_gp_mem with lu_gp
1935                  */
1936                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
1937                 move = 1;
1938         }
1939         /*
1940          * Associate lu_gp_mem with lu_gp_new.
1941          */
1942         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
1943         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1944
1945         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
1946                 " core/alua/lu_gps/%s, ID: %hu\n",
1947                 (move) ? "Moving" : "Adding",
1948                 config_item_name(&hba->hba_group.cg_item),
1949                 config_item_name(&su_dev->se_dev_group.cg_item),
1950                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
1951                 lu_gp_new->lu_gp_id);
1952
1953         core_alua_put_lu_gp_from_name(lu_gp_new);
1954         return count;
1955 }
1956
1957 static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
1958         .attr   = { .ca_owner = THIS_MODULE,
1959                     .ca_name = "alua_lu_gp",
1960                     .ca_mode = S_IRUGO | S_IWUSR },
1961         .show   = target_core_show_alua_lu_gp,
1962         .store  = target_core_store_alua_lu_gp,
1963 };
1964
1965 static struct configfs_attribute *lio_core_dev_attrs[] = {
1966         &target_core_attr_dev_info.attr,
1967         &target_core_attr_dev_control.attr,
1968         &target_core_attr_dev_alias.attr,
1969         &target_core_attr_dev_udev_path.attr,
1970         &target_core_attr_dev_enable.attr,
1971         &target_core_attr_dev_alua_lu_gp.attr,
1972         NULL,
1973 };
1974
1975 static void target_core_dev_release(struct config_item *item)
1976 {
1977         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
1978                                 struct se_subsystem_dev, se_dev_group);
1979         struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
1980         struct se_subsystem_api *t = hba->transport;
1981         struct config_group *dev_cg = &se_dev->se_dev_group;
1982
1983         kfree(dev_cg->default_groups);
1984         /*
1985          * This pointer will set when the storage is enabled with:
1986          *`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
1987          */
1988         if (se_dev->se_dev_ptr) {
1989                 pr_debug("Target_Core_ConfigFS: Calling se_free_"
1990                         "virtual_device() for se_dev_ptr: %p\n",
1991                         se_dev->se_dev_ptr);
1992
1993                 se_free_virtual_device(se_dev->se_dev_ptr, hba);
1994         } else {
1995                 /*
1996                  * Release struct se_subsystem_dev->se_dev_su_ptr..
1997                  */
1998                 pr_debug("Target_Core_ConfigFS: Calling t->free_"
1999                         "device() for se_dev_su_ptr: %p\n",
2000                         se_dev->se_dev_su_ptr);
2001
2002                 t->free_device(se_dev->se_dev_su_ptr);
2003         }
2004
2005         pr_debug("Target_Core_ConfigFS: Deallocating se_subsystem"
2006                         "_dev_t: %p\n", se_dev);
2007         kfree(se_dev);
2008 }
2009
2010 static ssize_t target_core_dev_show(struct config_item *item,
2011                                      struct configfs_attribute *attr,
2012                                      char *page)
2013 {
2014         struct se_subsystem_dev *se_dev = container_of(
2015                         to_config_group(item), struct se_subsystem_dev,
2016                         se_dev_group);
2017         struct target_core_configfs_attribute *tc_attr = container_of(
2018                         attr, struct target_core_configfs_attribute, attr);
2019
2020         if (!tc_attr->show)
2021                 return -EINVAL;
2022
2023         return tc_attr->show(se_dev, page);
2024 }
2025
2026 static ssize_t target_core_dev_store(struct config_item *item,
2027                                       struct configfs_attribute *attr,
2028                                       const char *page, size_t count)
2029 {
2030         struct se_subsystem_dev *se_dev = container_of(
2031                         to_config_group(item), struct se_subsystem_dev,
2032                         se_dev_group);
2033         struct target_core_configfs_attribute *tc_attr = container_of(
2034                         attr, struct target_core_configfs_attribute, attr);
2035
2036         if (!tc_attr->store)
2037                 return -EINVAL;
2038
2039         return tc_attr->store(se_dev, page, count);
2040 }
2041
2042 static struct configfs_item_operations target_core_dev_item_ops = {
2043         .release                = target_core_dev_release,
2044         .show_attribute         = target_core_dev_show,
2045         .store_attribute        = target_core_dev_store,
2046 };
2047
2048 static struct config_item_type target_core_dev_cit = {
2049         .ct_item_ops            = &target_core_dev_item_ops,
2050         .ct_attrs               = lio_core_dev_attrs,
2051         .ct_owner               = THIS_MODULE,
2052 };
2053
2054 /* End functions for struct config_item_type target_core_dev_cit */
2055
2056 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2057
2058 CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
2059 #define SE_DEV_ALUA_LU_ATTR(_name, _mode)                               \
2060 static struct target_core_alua_lu_gp_attribute                          \
2061                         target_core_alua_lu_gp_##_name =                \
2062         __CONFIGFS_EATTR(_name, _mode,                                  \
2063         target_core_alua_lu_gp_show_attr_##_name,                       \
2064         target_core_alua_lu_gp_store_attr_##_name);
2065
2066 #define SE_DEV_ALUA_LU_ATTR_RO(_name)                                   \
2067 static struct target_core_alua_lu_gp_attribute                          \
2068                         target_core_alua_lu_gp_##_name =                \
2069         __CONFIGFS_EATTR_RO(_name,                                      \
2070         target_core_alua_lu_gp_show_attr_##_name);
2071
2072 /*
2073  * lu_gp_id
2074  */
2075 static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
2076         struct t10_alua_lu_gp *lu_gp,
2077         char *page)
2078 {
2079         if (!lu_gp->lu_gp_valid_id)
2080                 return 0;
2081
2082         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2083 }
2084
2085 static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
2086         struct t10_alua_lu_gp *lu_gp,
2087         const char *page,
2088         size_t count)
2089 {
2090         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2091         unsigned long lu_gp_id;
2092         int ret;
2093
2094         ret = strict_strtoul(page, 0, &lu_gp_id);
2095         if (ret < 0) {
2096                 pr_err("strict_strtoul() returned %d for"
2097                         " lu_gp_id\n", ret);
2098                 return -EINVAL;
2099         }
2100         if (lu_gp_id > 0x0000ffff) {
2101                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2102                         " 0x0000ffff\n", lu_gp_id);
2103                 return -EINVAL;
2104         }
2105
2106         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2107         if (ret < 0)
2108                 return -EINVAL;
2109
2110         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2111                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2112                 config_item_name(&alua_lu_gp_cg->cg_item),
2113                 lu_gp->lu_gp_id);
2114
2115         return count;
2116 }
2117
2118 SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);
2119
2120 /*
2121  * members
2122  */
2123 static ssize_t target_core_alua_lu_gp_show_attr_members(
2124         struct t10_alua_lu_gp *lu_gp,
2125         char *page)
2126 {
2127         struct se_device *dev;
2128         struct se_hba *hba;
2129         struct se_subsystem_dev *su_dev;
2130         struct t10_alua_lu_gp_member *lu_gp_mem;
2131         ssize_t len = 0, cur_len;
2132         unsigned char buf[LU_GROUP_NAME_BUF];
2133
2134         memset(buf, 0, LU_GROUP_NAME_BUF);
2135
2136         spin_lock(&lu_gp->lu_gp_lock);
2137         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2138                 dev = lu_gp_mem->lu_gp_mem_dev;
2139                 su_dev = dev->se_sub_dev;
2140                 hba = su_dev->se_dev_hba;
2141
2142                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2143                         config_item_name(&hba->hba_group.cg_item),
2144                         config_item_name(&su_dev->se_dev_group.cg_item));
2145                 cur_len++; /* Extra byte for NULL terminator */
2146
2147                 if ((cur_len + len) > PAGE_SIZE) {
2148                         pr_warn("Ran out of lu_gp_show_attr"
2149                                 "_members buffer\n");
2150                         break;
2151                 }
2152                 memcpy(page+len, buf, cur_len);
2153                 len += cur_len;
2154         }
2155         spin_unlock(&lu_gp->lu_gp_lock);
2156
2157         return len;
2158 }
2159
2160 SE_DEV_ALUA_LU_ATTR_RO(members);
2161
2162 CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);
2163
2164 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2165         &target_core_alua_lu_gp_lu_gp_id.attr,
2166         &target_core_alua_lu_gp_members.attr,
2167         NULL,
2168 };
2169
2170 static void target_core_alua_lu_gp_release(struct config_item *item)
2171 {
2172         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2173                         struct t10_alua_lu_gp, lu_gp_group);
2174
2175         core_alua_free_lu_gp(lu_gp);
2176 }
2177
2178 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2179         .release                = target_core_alua_lu_gp_release,
2180         .show_attribute         = target_core_alua_lu_gp_attr_show,
2181         .store_attribute        = target_core_alua_lu_gp_attr_store,
2182 };
2183
2184 static struct config_item_type target_core_alua_lu_gp_cit = {
2185         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2186         .ct_attrs               = target_core_alua_lu_gp_attrs,
2187         .ct_owner               = THIS_MODULE,
2188 };
2189
2190 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2191
2192 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2193
2194 static struct config_group *target_core_alua_create_lu_gp(
2195         struct config_group *group,
2196         const char *name)
2197 {
2198         struct t10_alua_lu_gp *lu_gp;
2199         struct config_group *alua_lu_gp_cg = NULL;
2200         struct config_item *alua_lu_gp_ci = NULL;
2201
2202         lu_gp = core_alua_allocate_lu_gp(name, 0);
2203         if (IS_ERR(lu_gp))
2204                 return NULL;
2205
2206         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2207         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2208
2209         config_group_init_type_name(alua_lu_gp_cg, name,
2210                         &target_core_alua_lu_gp_cit);
2211
2212         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2213                 " Group: core/alua/lu_gps/%s\n",
2214                 config_item_name(alua_lu_gp_ci));
2215
2216         return alua_lu_gp_cg;
2217
2218 }
2219
2220 static void target_core_alua_drop_lu_gp(
2221         struct config_group *group,
2222         struct config_item *item)
2223 {
2224         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2225                         struct t10_alua_lu_gp, lu_gp_group);
2226
2227         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2228                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2229                 config_item_name(item), lu_gp->lu_gp_id);
2230         /*
2231          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2232          * -> target_core_alua_lu_gp_release()
2233          */
2234         config_item_put(item);
2235 }
2236
2237 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2238         .make_group             = &target_core_alua_create_lu_gp,
2239         .drop_item              = &target_core_alua_drop_lu_gp,
2240 };
2241
2242 static struct config_item_type target_core_alua_lu_gps_cit = {
2243         .ct_item_ops            = NULL,
2244         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2245         .ct_owner               = THIS_MODULE,
2246 };
2247
2248 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2249
2250 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2251
2252 CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
2253 #define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)                            \
2254 static struct target_core_alua_tg_pt_gp_attribute                       \
2255                         target_core_alua_tg_pt_gp_##_name =             \
2256         __CONFIGFS_EATTR(_name, _mode,                                  \
2257         target_core_alua_tg_pt_gp_show_attr_##_name,                    \
2258         target_core_alua_tg_pt_gp_store_attr_##_name);
2259
2260 #define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)                                \
2261 static struct target_core_alua_tg_pt_gp_attribute                       \
2262                         target_core_alua_tg_pt_gp_##_name =             \
2263         __CONFIGFS_EATTR_RO(_name,                                      \
2264         target_core_alua_tg_pt_gp_show_attr_##_name);
2265
2266 /*
2267  * alua_access_state
2268  */
2269 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
2270         struct t10_alua_tg_pt_gp *tg_pt_gp,
2271         char *page)
2272 {
2273         return sprintf(page, "%d\n",
2274                 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
2275 }
2276
2277 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
2278         struct t10_alua_tg_pt_gp *tg_pt_gp,
2279         const char *page,
2280         size_t count)
2281 {
2282         struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
2283         unsigned long tmp;
2284         int new_state, ret;
2285
2286         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2287                 pr_err("Unable to do implict ALUA on non valid"
2288                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2289                 return -EINVAL;
2290         }
2291
2292         ret = strict_strtoul(page, 0, &tmp);
2293         if (ret < 0) {
2294                 pr_err("Unable to extract new ALUA access state from"
2295                                 " %s\n", page);
2296                 return -EINVAL;
2297         }
2298         new_state = (int)tmp;
2299
2300         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) {
2301                 pr_err("Unable to process implict configfs ALUA"
2302                         " transition while TPGS_IMPLICT_ALUA is diabled\n");
2303                 return -EINVAL;
2304         }
2305
2306         ret = core_alua_do_port_transition(tg_pt_gp, su_dev->se_dev_ptr,
2307                                         NULL, NULL, new_state, 0);
2308         return (!ret) ? count : -EINVAL;
2309 }
2310
2311 SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);
2312
2313 /*
2314  * alua_access_status
2315  */
2316 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
2317         struct t10_alua_tg_pt_gp *tg_pt_gp,
2318         char *page)
2319 {
2320         return sprintf(page, "%s\n",
2321                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2322 }
2323
2324 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
2325         struct t10_alua_tg_pt_gp *tg_pt_gp,
2326         const char *page,
2327         size_t count)
2328 {
2329         unsigned long tmp;
2330         int new_status, ret;
2331
2332         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2333                 pr_err("Unable to do set ALUA access status on non"
2334                         " valid tg_pt_gp ID: %hu\n",
2335                         tg_pt_gp->tg_pt_gp_valid_id);
2336                 return -EINVAL;
2337         }
2338
2339         ret = strict_strtoul(page, 0, &tmp);
2340         if (ret < 0) {
2341                 pr_err("Unable to extract new ALUA access status"
2342                                 " from %s\n", page);
2343                 return -EINVAL;
2344         }
2345         new_status = (int)tmp;
2346
2347         if ((new_status != ALUA_STATUS_NONE) &&
2348             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
2349             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
2350                 pr_err("Illegal ALUA access status: 0x%02x\n",
2351                                 new_status);
2352                 return -EINVAL;
2353         }
2354
2355         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2356         return count;
2357 }
2358
2359 SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);
2360
2361 /*
2362  * alua_access_type
2363  */
2364 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
2365         struct t10_alua_tg_pt_gp *tg_pt_gp,
2366         char *page)
2367 {
2368         return core_alua_show_access_type(tg_pt_gp, page);
2369 }
2370
2371 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
2372         struct t10_alua_tg_pt_gp *tg_pt_gp,
2373         const char *page,
2374         size_t count)
2375 {
2376         return core_alua_store_access_type(tg_pt_gp, page, count);
2377 }
2378
2379 SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);
2380
2381 /*
2382  * alua_write_metadata
2383  */
2384 static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
2385         struct t10_alua_tg_pt_gp *tg_pt_gp,
2386         char *page)
2387 {
2388         return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
2389 }
2390
2391 static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
2392         struct t10_alua_tg_pt_gp *tg_pt_gp,
2393         const char *page,
2394         size_t count)
2395 {
2396         unsigned long tmp;
2397         int ret;
2398
2399         ret = strict_strtoul(page, 0, &tmp);
2400         if (ret < 0) {
2401                 pr_err("Unable to extract alua_write_metadata\n");
2402                 return -EINVAL;
2403         }
2404
2405         if ((tmp != 0) && (tmp != 1)) {
2406                 pr_err("Illegal value for alua_write_metadata:"
2407                         " %lu\n", tmp);
2408                 return -EINVAL;
2409         }
2410         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2411
2412         return count;
2413 }
2414
2415 SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);
2416
2417
2418
2419 /*
2420  * nonop_delay_msecs
2421  */
2422 static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
2423         struct t10_alua_tg_pt_gp *tg_pt_gp,
2424         char *page)
2425 {
2426         return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);
2427
2428 }
2429
2430 static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
2431         struct t10_alua_tg_pt_gp *tg_pt_gp,
2432         const char *page,
2433         size_t count)
2434 {
2435         return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
2436 }
2437
2438 SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);
2439
2440 /*
2441  * trans_delay_msecs
2442  */
2443 static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
2444         struct t10_alua_tg_pt_gp *tg_pt_gp,
2445         char *page)
2446 {
2447         return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
2448 }
2449
2450 static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
2451         struct t10_alua_tg_pt_gp *tg_pt_gp,
2452         const char *page,
2453         size_t count)
2454 {
2455         return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
2456 }
2457
2458 SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);
2459
2460 /*
2461  * preferred
2462  */
2463
2464 static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
2465         struct t10_alua_tg_pt_gp *tg_pt_gp,
2466         char *page)
2467 {
2468         return core_alua_show_preferred_bit(tg_pt_gp, page);
2469 }
2470
2471 static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
2472         struct t10_alua_tg_pt_gp *tg_pt_gp,
2473         const char *page,
2474         size_t count)
2475 {
2476         return core_alua_store_preferred_bit(tg_pt_gp, page, count);
2477 }
2478
2479 SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);
2480
2481 /*
2482  * tg_pt_gp_id
2483  */
2484 static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
2485         struct t10_alua_tg_pt_gp *tg_pt_gp,
2486         char *page)
2487 {
2488         if (!tg_pt_gp->tg_pt_gp_valid_id)
2489                 return 0;
2490
2491         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2492 }
2493
2494 static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
2495         struct t10_alua_tg_pt_gp *tg_pt_gp,
2496         const char *page,
2497         size_t count)
2498 {
2499         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2500         unsigned long tg_pt_gp_id;
2501         int ret;
2502
2503         ret = strict_strtoul(page, 0, &tg_pt_gp_id);
2504         if (ret < 0) {
2505                 pr_err("strict_strtoul() returned %d for"
2506                         " tg_pt_gp_id\n", ret);
2507                 return -EINVAL;
2508         }
2509         if (tg_pt_gp_id > 0x0000ffff) {
2510                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
2511                         " 0x0000ffff\n", tg_pt_gp_id);
2512                 return -EINVAL;
2513         }
2514
2515         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2516         if (ret < 0)
2517                 return -EINVAL;
2518
2519         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2520                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2521                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2522                 tg_pt_gp->tg_pt_gp_id);
2523
2524         return count;
2525 }
2526
2527 SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);
2528
2529 /*
2530  * members
2531  */
2532 static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
2533         struct t10_alua_tg_pt_gp *tg_pt_gp,
2534         char *page)
2535 {
2536         struct se_port *port;
2537         struct se_portal_group *tpg;
2538         struct se_lun *lun;
2539         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2540         ssize_t len = 0, cur_len;
2541         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2542
2543         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2544
2545         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2546         list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
2547                         tg_pt_gp_mem_list) {
2548                 port = tg_pt_gp_mem->tg_pt;
2549                 tpg = port->sep_tpg;
2550                 lun = port->sep_lun;
2551
2552                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2553                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2554                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2555                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2556                         config_item_name(&lun->lun_group.cg_item));
2557                 cur_len++; /* Extra byte for NULL terminator */
2558
2559                 if ((cur_len + len) > PAGE_SIZE) {
2560                         pr_warn("Ran out of lu_gp_show_attr"
2561                                 "_members buffer\n");
2562                         break;
2563                 }
2564                 memcpy(page+len, buf, cur_len);
2565                 len += cur_len;
2566         }
2567         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2568
2569         return len;
2570 }
2571
2572 SE_DEV_ALUA_TG_PT_ATTR_RO(members);
2573
2574 CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
2575                         tg_pt_gp_group);
2576
2577 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2578         &target_core_alua_tg_pt_gp_alua_access_state.attr,
2579         &target_core_alua_tg_pt_gp_alua_access_status.attr,
2580         &target_core_alua_tg_pt_gp_alua_access_type.attr,
2581         &target_core_alua_tg_pt_gp_alua_write_metadata.attr,
2582         &target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
2583         &target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
2584         &target_core_alua_tg_pt_gp_preferred.attr,
2585         &target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
2586         &target_core_alua_tg_pt_gp_members.attr,
2587         NULL,
2588 };
2589
2590 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2591 {
2592         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2593                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2594
2595         core_alua_free_tg_pt_gp(tg_pt_gp);
2596 }
2597
2598 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2599         .release                = target_core_alua_tg_pt_gp_release,
2600         .show_attribute         = target_core_alua_tg_pt_gp_attr_show,
2601         .store_attribute        = target_core_alua_tg_pt_gp_attr_store,
2602 };
2603
2604 static struct config_item_type target_core_alua_tg_pt_gp_cit = {
2605         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2606         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2607         .ct_owner               = THIS_MODULE,
2608 };
2609
2610 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2611
2612 /* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2613
2614 static struct config_group *target_core_alua_create_tg_pt_gp(
2615         struct config_group *group,
2616         const char *name)
2617 {
2618         struct t10_alua *alua = container_of(group, struct t10_alua,
2619                                         alua_tg_pt_gps_group);
2620         struct t10_alua_tg_pt_gp *tg_pt_gp;
2621         struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
2622         struct config_group *alua_tg_pt_gp_cg = NULL;
2623         struct config_item *alua_tg_pt_gp_ci = NULL;
2624
2625         tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
2626         if (!tg_pt_gp)
2627                 return NULL;
2628
2629         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2630         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2631
2632         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2633                         &target_core_alua_tg_pt_gp_cit);
2634
2635         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2636                 " Group: alua/tg_pt_gps/%s\n",
2637                 config_item_name(alua_tg_pt_gp_ci));
2638
2639         return alua_tg_pt_gp_cg;
2640 }
2641
2642 static void target_core_alua_drop_tg_pt_gp(
2643         struct config_group *group,
2644         struct config_item *item)
2645 {
2646         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2647                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2648
2649         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2650                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2651                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2652         /*
2653          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2654          * -> target_core_alua_tg_pt_gp_release().
2655          */
2656         config_item_put(item);
2657 }
2658
2659 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2660         .make_group             = &target_core_alua_create_tg_pt_gp,
2661         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2662 };
2663
2664 static struct config_item_type target_core_alua_tg_pt_gps_cit = {
2665         .ct_group_ops           = &target_core_alua_tg_pt_gps_group_ops,
2666         .ct_owner               = THIS_MODULE,
2667 };
2668
2669 /* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
2670
2671 /* Start functions for struct config_item_type target_core_alua_cit */
2672
2673 /*
2674  * target_core_alua_cit is a ConfigFS group that lives under
2675  * /sys/kernel/config/target/core/alua.  There are default groups
2676  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2677  * target_core_alua_cit in target_core_init_configfs() below.
2678  */
2679 static struct config_item_type target_core_alua_cit = {
2680         .ct_item_ops            = NULL,
2681         .ct_attrs               = NULL,
2682         .ct_owner               = THIS_MODULE,
2683 };
2684
2685 /* End functions for struct config_item_type target_core_alua_cit */
2686
2687 /* Start functions for struct config_item_type target_core_stat_cit */
2688
2689 static struct config_group *target_core_stat_mkdir(
2690         struct config_group *group,
2691         const char *name)
2692 {
2693         return ERR_PTR(-ENOSYS);
2694 }
2695
2696 static void target_core_stat_rmdir(
2697         struct config_group *group,
2698         struct config_item *item)
2699 {
2700         return;
2701 }
2702
2703 static struct configfs_group_operations target_core_stat_group_ops = {
2704         .make_group             = &target_core_stat_mkdir,
2705         .drop_item              = &target_core_stat_rmdir,
2706 };
2707
2708 static struct config_item_type target_core_stat_cit = {
2709         .ct_group_ops           = &target_core_stat_group_ops,
2710         .ct_owner               = THIS_MODULE,
2711 };
2712
2713 /* End functions for struct config_item_type target_core_stat_cit */
2714
2715 /* Start functions for struct config_item_type target_core_hba_cit */
2716
2717 static struct config_group *target_core_make_subdev(
2718         struct config_group *group,
2719         const char *name)
2720 {
2721         struct t10_alua_tg_pt_gp *tg_pt_gp;
2722         struct se_subsystem_dev *se_dev;
2723         struct se_subsystem_api *t;
2724         struct config_item *hba_ci = &group->cg_item;
2725         struct se_hba *hba = item_to_hba(hba_ci);
2726         struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
2727         struct config_group *dev_stat_grp = NULL;
2728         int errno = -ENOMEM, ret;
2729
2730         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2731         if (ret)
2732                 return ERR_PTR(ret);
2733         /*
2734          * Locate the struct se_subsystem_api from parent's struct se_hba.
2735          */
2736         t = hba->transport;
2737
2738         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
2739         if (!se_dev) {
2740                 pr_err("Unable to allocate memory for"
2741                                 " struct se_subsystem_dev\n");
2742                 goto unlock;
2743         }
2744         INIT_LIST_HEAD(&se_dev->se_dev_node);
2745         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
2746         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
2747         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
2748         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
2749         spin_lock_init(&se_dev->t10_pr.registration_lock);
2750         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
2751         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
2752         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
2753         spin_lock_init(&se_dev->se_dev_lock);
2754         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
2755         se_dev->t10_wwn.t10_sub_dev = se_dev;
2756         se_dev->t10_alua.t10_sub_dev = se_dev;
2757         se_dev->se_dev_attrib.da_sub_dev = se_dev;
2758
2759         se_dev->se_dev_hba = hba;
2760         dev_cg = &se_dev->se_dev_group;
2761
2762         dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 7,
2763                         GFP_KERNEL);
2764         if (!dev_cg->default_groups)
2765                 goto out;
2766         /*
2767          * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
2768          * for ->allocate_virtdevice()
2769          *
2770          * se_dev->se_dev_ptr will be set after ->create_virtdev()
2771          * has been called successfully in the next level up in the
2772          * configfs tree for device object's struct config_group.
2773          */
2774         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
2775         if (!se_dev->se_dev_su_ptr) {
2776                 pr_err("Unable to locate subsystem dependent pointer"
2777                         " from allocate_virtdevice()\n");
2778                 goto out;
2779         }
2780         spin_lock(&se_device_lock);
2781         list_add_tail(&se_dev->se_dev_node, &se_dev_list);
2782         spin_unlock(&se_device_lock);
2783
2784         config_group_init_type_name(&se_dev->se_dev_group, name,
2785                         &target_core_dev_cit);
2786         config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
2787                         &target_core_dev_attrib_cit);
2788         config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
2789                         &target_core_dev_pr_cit);
2790         config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
2791                         &target_core_dev_wwn_cit);
2792         config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
2793                         "alua", &target_core_alua_tg_pt_gps_cit);
2794         config_group_init_type_name(&se_dev->dev_stat_grps.stat_group,
2795                         "statistics", &target_core_stat_cit);
2796
2797         dev_cg->default_groups[0] = &se_dev->se_dev_attrib.da_group;
2798         dev_cg->default_groups[1] = &se_dev->se_dev_pr_group;
2799         dev_cg->default_groups[2] = &se_dev->t10_wwn.t10_wwn_group;
2800         dev_cg->default_groups[3] = &se_dev->t10_alua.alua_tg_pt_gps_group;
2801         dev_cg->default_groups[4] = &se_dev->dev_stat_grps.stat_group;
2802         dev_cg->default_groups[5] = NULL;
2803         /*
2804          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2805          */
2806         tg_pt_gp = core_alua_allocate_tg_pt_gp(se_dev, "default_tg_pt_gp", 1);
2807         if (!tg_pt_gp)
2808                 goto out;
2809
2810         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2811         tg_pt_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
2812                                 GFP_KERNEL);
2813         if (!tg_pt_gp_cg->default_groups) {
2814                 pr_err("Unable to allocate tg_pt_gp_cg->"
2815                                 "default_groups\n");
2816                 goto out;
2817         }
2818
2819         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2820                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2821         tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
2822         tg_pt_gp_cg->default_groups[1] = NULL;
2823         se_dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2824         /*
2825          * Add core/$HBA/$DEV/statistics/ default groups
2826          */
2827         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2828         dev_stat_grp->default_groups = kzalloc(sizeof(struct config_group) * 4,
2829                                 GFP_KERNEL);
2830         if (!dev_stat_grp->default_groups) {
2831                 pr_err("Unable to allocate dev_stat_grp->default_groups\n");
2832                 goto out;
2833         }
2834         target_stat_setup_dev_default_groups(se_dev);
2835
2836         pr_debug("Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
2837                 " %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);
2838
2839         mutex_unlock(&hba->hba_access_mutex);
2840         return &se_dev->se_dev_group;
2841 out:
2842         if (se_dev->t10_alua.default_tg_pt_gp) {
2843                 core_alua_free_tg_pt_gp(se_dev->t10_alua.default_tg_pt_gp);
2844                 se_dev->t10_alua.default_tg_pt_gp = NULL;
2845         }
2846         if (dev_stat_grp)
2847                 kfree(dev_stat_grp->default_groups);
2848         if (tg_pt_gp_cg)
2849                 kfree(tg_pt_gp_cg->default_groups);
2850         if (dev_cg)
2851                 kfree(dev_cg->default_groups);
2852         if (se_dev->se_dev_su_ptr)
2853                 t->free_device(se_dev->se_dev_su_ptr);
2854         kfree(se_dev);
2855 unlock:
2856         mutex_unlock(&hba->hba_access_mutex);
2857         return ERR_PTR(errno);
2858 }
2859
2860 static void target_core_drop_subdev(
2861         struct config_group *group,
2862         struct config_item *item)
2863 {
2864         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
2865                                 struct se_subsystem_dev, se_dev_group);
2866         struct se_hba *hba;
2867         struct se_subsystem_api *t;
2868         struct config_item *df_item;
2869         struct config_group *dev_cg, *tg_pt_gp_cg, *dev_stat_grp;
2870         int i;
2871
2872         hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
2873
2874         mutex_lock(&hba->hba_access_mutex);
2875         t = hba->transport;
2876
2877         spin_lock(&se_device_lock);
2878         list_del(&se_dev->se_dev_node);
2879         spin_unlock(&se_device_lock);
2880
2881         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
2882         for (i = 0; dev_stat_grp->default_groups[i]; i++) {
2883                 df_item = &dev_stat_grp->default_groups[i]->cg_item;
2884                 dev_stat_grp->default_groups[i] = NULL;
2885                 config_item_put(df_item);
2886         }
2887         kfree(dev_stat_grp->default_groups);
2888
2889         tg_pt_gp_cg = &se_dev->t10_alua.alua_tg_pt_gps_group;
2890         for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
2891                 df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
2892                 tg_pt_gp_cg->default_groups[i] = NULL;
2893                 config_item_put(df_item);
2894         }
2895         kfree(tg_pt_gp_cg->default_groups);
2896         /*
2897          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
2898          * directly from target_core_alua_tg_pt_gp_release().
2899          */
2900         se_dev->t10_alua.default_tg_pt_gp = NULL;
2901
2902         dev_cg = &se_dev->se_dev_group;
2903         for (i = 0; dev_cg->default_groups[i]; i++) {
2904                 df_item = &dev_cg->default_groups[i]->cg_item;
2905                 dev_cg->default_groups[i] = NULL;
2906                 config_item_put(df_item);
2907         }
2908         /*
2909          * The releasing of se_dev and associated se_dev->se_dev_ptr is done
2910          * from target_core_dev_item_ops->release() ->target_core_dev_release().
2911          */
2912         config_item_put(item);
2913         mutex_unlock(&hba->hba_access_mutex);
2914 }
2915
2916 static struct configfs_group_operations target_core_hba_group_ops = {
2917         .make_group             = target_core_make_subdev,
2918         .drop_item              = target_core_drop_subdev,
2919 };
2920
2921 CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
2922 #define SE_HBA_ATTR(_name, _mode)                               \
2923 static struct target_core_hba_attribute                         \
2924                 target_core_hba_##_name =                       \
2925                 __CONFIGFS_EATTR(_name, _mode,                  \
2926                 target_core_hba_show_attr_##_name,              \
2927                 target_core_hba_store_attr_##_name);
2928
2929 #define SE_HBA_ATTR_RO(_name)                                   \
2930 static struct target_core_hba_attribute                         \
2931                 target_core_hba_##_name =                       \
2932                 __CONFIGFS_EATTR_RO(_name,                      \
2933                 target_core_hba_show_attr_##_name);
2934
2935 static ssize_t target_core_hba_show_attr_hba_info(
2936         struct se_hba *hba,
2937         char *page)
2938 {
2939         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
2940                         hba->hba_id, hba->transport->name,
2941                         TARGET_CORE_CONFIGFS_VERSION);
2942 }
2943
2944 SE_HBA_ATTR_RO(hba_info);
2945
2946 static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
2947                                 char *page)
2948 {
2949         int hba_mode = 0;
2950
2951         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
2952                 hba_mode = 1;
2953
2954         return sprintf(page, "%d\n", hba_mode);
2955 }
2956
2957 static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
2958                                 const char *page, size_t count)
2959 {
2960         struct se_subsystem_api *transport = hba->transport;
2961         unsigned long mode_flag;
2962         int ret;
2963
2964         if (transport->pmode_enable_hba == NULL)
2965                 return -EINVAL;
2966
2967         ret = strict_strtoul(page, 0, &mode_flag);
2968         if (ret < 0) {
2969                 pr_err("Unable to extract hba mode flag: %d\n", ret);
2970                 return -EINVAL;
2971         }
2972
2973         spin_lock(&hba->device_lock);
2974         if (!list_empty(&hba->hba_dev_list)) {
2975                 pr_err("Unable to set hba_mode with active devices\n");
2976                 spin_unlock(&hba->device_lock);
2977                 return -EINVAL;
2978         }
2979         spin_unlock(&hba->device_lock);
2980
2981         ret = transport->pmode_enable_hba(hba, mode_flag);
2982         if (ret < 0)
2983                 return -EINVAL;
2984         if (ret > 0)
2985                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
2986         else if (ret == 0)
2987                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
2988
2989         return count;
2990 }
2991
2992 SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
2993
2994 CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
2995
2996 static void target_core_hba_release(struct config_item *item)
2997 {
2998         struct se_hba *hba = container_of(to_config_group(item),
2999                                 struct se_hba, hba_group);
3000         core_delete_hba(hba);
3001 }
3002
3003 static struct configfs_attribute *target_core_hba_attrs[] = {
3004         &target_core_hba_hba_info.attr,
3005         &target_core_hba_hba_mode.attr,
3006         NULL,
3007 };
3008
3009 static struct configfs_item_operations target_core_hba_item_ops = {
3010         .release                = target_core_hba_release,
3011         .show_attribute         = target_core_hba_attr_show,
3012         .store_attribute        = target_core_hba_attr_store,
3013 };
3014
3015 static struct config_item_type target_core_hba_cit = {
3016         .ct_item_ops            = &target_core_hba_item_ops,
3017         .ct_group_ops           = &target_core_hba_group_ops,
3018         .ct_attrs               = target_core_hba_attrs,
3019         .ct_owner               = THIS_MODULE,
3020 };
3021
3022 static struct config_group *target_core_call_addhbatotarget(
3023         struct config_group *group,
3024         const char *name)
3025 {
3026         char *se_plugin_str, *str, *str2;
3027         struct se_hba *hba;
3028         char buf[TARGET_CORE_NAME_MAX_LEN];
3029         unsigned long plugin_dep_id = 0;
3030         int ret;
3031
3032         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3033         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3034                 pr_err("Passed *name strlen(): %d exceeds"
3035                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3036                         TARGET_CORE_NAME_MAX_LEN);
3037                 return ERR_PTR(-ENAMETOOLONG);
3038         }
3039         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3040
3041         str = strstr(buf, "_");
3042         if (!str) {
3043                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3044                 return ERR_PTR(-EINVAL);
3045         }
3046         se_plugin_str = buf;
3047         /*
3048          * Special case for subsystem plugins that have "_" in their names.
3049          * Namely rd_direct and rd_mcp..
3050          */
3051         str2 = strstr(str+1, "_");
3052         if (str2) {
3053                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3054                 str2++; /* Skip to start of plugin dependent ID */
3055                 str = str2;
3056         } else {
3057                 *str = '\0'; /* Terminate for *se_plugin_str */
3058                 str++; /* Skip to start of plugin dependent ID */
3059         }
3060
3061         ret = strict_strtoul(str, 0, &plugin_dep_id);
3062         if (ret < 0) {
3063                 pr_err("strict_strtoul() returned %d for"
3064                                 " plugin_dep_id\n", ret);
3065                 return ERR_PTR(-EINVAL);
3066         }
3067         /*
3068          * Load up TCM subsystem plugins if they have not already been loaded.
3069          */
3070         transport_subsystem_check_init();
3071
3072         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3073         if (IS_ERR(hba))
3074                 return ERR_CAST(hba);
3075
3076         config_group_init_type_name(&hba->hba_group, name,
3077                         &target_core_hba_cit);
3078
3079         return &hba->hba_group;
3080 }
3081
3082 static void target_core_call_delhbafromtarget(
3083         struct config_group *group,
3084         struct config_item *item)
3085 {
3086         /*
3087          * core_delete_hba() is called from target_core_hba_item_ops->release()
3088          * -> target_core_hba_release()
3089          */
3090         config_item_put(item);
3091 }
3092
3093 static struct configfs_group_operations target_core_group_ops = {
3094         .make_group     = target_core_call_addhbatotarget,
3095         .drop_item      = target_core_call_delhbafromtarget,
3096 };
3097
3098 static struct config_item_type target_core_cit = {
3099         .ct_item_ops    = NULL,
3100         .ct_group_ops   = &target_core_group_ops,
3101         .ct_attrs       = NULL,
3102         .ct_owner       = THIS_MODULE,
3103 };
3104
3105 /* Stop functions for struct config_item_type target_core_hba_cit */
3106
3107 static int __init target_core_init_configfs(void)
3108 {
3109         struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
3110         struct config_group *lu_gp_cg = NULL;
3111         struct configfs_subsystem *subsys;
3112         struct t10_alua_lu_gp *lu_gp;
3113         int ret;
3114
3115         pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
3116                 " Engine: %s on %s/%s on "UTS_RELEASE"\n",
3117                 TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
3118
3119         subsys = target_core_subsystem[0];
3120         config_group_init(&subsys->su_group);
3121         mutex_init(&subsys->su_mutex);
3122
3123         INIT_LIST_HEAD(&g_tf_list);
3124         mutex_init(&g_tf_lock);
3125         ret = init_se_kmem_caches();
3126         if (ret < 0)
3127                 return ret;
3128         /*
3129          * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
3130          * and ALUA Logical Unit Group and Target Port Group infrastructure.
3131          */
3132         target_cg = &subsys->su_group;
3133         target_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3134                                 GFP_KERNEL);
3135         if (!target_cg->default_groups) {
3136                 pr_err("Unable to allocate target_cg->default_groups\n");
3137                 goto out_global;
3138         }
3139
3140         config_group_init_type_name(&target_core_hbagroup,
3141                         "core", &target_core_cit);
3142         target_cg->default_groups[0] = &target_core_hbagroup;
3143         target_cg->default_groups[1] = NULL;
3144         /*
3145          * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
3146          */
3147         hba_cg = &target_core_hbagroup;
3148         hba_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3149                                 GFP_KERNEL);
3150         if (!hba_cg->default_groups) {
3151                 pr_err("Unable to allocate hba_cg->default_groups\n");
3152                 goto out_global;
3153         }
3154         config_group_init_type_name(&alua_group,
3155                         "alua", &target_core_alua_cit);
3156         hba_cg->default_groups[0] = &alua_group;
3157         hba_cg->default_groups[1] = NULL;
3158         /*
3159          * Add ALUA Logical Unit Group and Target Port Group ConfigFS
3160          * groups under /sys/kernel/config/target/core/alua/
3161          */
3162         alua_cg = &alua_group;
3163         alua_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3164                         GFP_KERNEL);
3165         if (!alua_cg->default_groups) {
3166                 pr_err("Unable to allocate alua_cg->default_groups\n");
3167                 goto out_global;
3168         }
3169
3170         config_group_init_type_name(&alua_lu_gps_group,
3171                         "lu_gps", &target_core_alua_lu_gps_cit);
3172         alua_cg->default_groups[0] = &alua_lu_gps_group;
3173         alua_cg->default_groups[1] = NULL;
3174         /*
3175          * Add core/alua/lu_gps/default_lu_gp
3176          */
3177         lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
3178         if (IS_ERR(lu_gp))
3179                 goto out_global;
3180
3181         lu_gp_cg = &alua_lu_gps_group;
3182         lu_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
3183                         GFP_KERNEL);
3184         if (!lu_gp_cg->default_groups) {
3185                 pr_err("Unable to allocate lu_gp_cg->default_groups\n");
3186                 goto out_global;
3187         }
3188
3189         config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
3190                                 &target_core_alua_lu_gp_cit);
3191         lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
3192         lu_gp_cg->default_groups[1] = NULL;
3193         default_lu_gp = lu_gp;
3194         /*
3195          * Register the target_core_mod subsystem with configfs.
3196          */
3197         ret = configfs_register_subsystem(subsys);
3198         if (ret < 0) {
3199                 pr_err("Error %d while registering subsystem %s\n",
3200                         ret, subsys->su_group.cg_item.ci_namebuf);
3201                 goto out_global;
3202         }
3203         pr_debug("TARGET_CORE[0]: Initialized ConfigFS Fabric"
3204                 " Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
3205                 " on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
3206         /*
3207          * Register built-in RAMDISK subsystem logic for virtual LUN 0
3208          */
3209         ret = rd_module_init();
3210         if (ret < 0)
3211                 goto out;
3212
3213         if (core_dev_setup_virtual_lun0() < 0)
3214                 goto out;
3215
3216         return 0;
3217
3218 out:
3219         configfs_unregister_subsystem(subsys);
3220         core_dev_release_virtual_lun0();
3221         rd_module_exit();
3222 out_global:
3223         if (default_lu_gp) {
3224                 core_alua_free_lu_gp(default_lu_gp);
3225                 default_lu_gp = NULL;
3226         }
3227         if (lu_gp_cg)
3228                 kfree(lu_gp_cg->default_groups);
3229         if (alua_cg)
3230                 kfree(alua_cg->default_groups);
3231         if (hba_cg)
3232                 kfree(hba_cg->default_groups);
3233         kfree(target_cg->default_groups);
3234         release_se_kmem_caches();
3235         return ret;
3236 }
3237
3238 static void __exit target_core_exit_configfs(void)
3239 {
3240         struct configfs_subsystem *subsys;
3241         struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
3242         struct config_item *item;
3243         int i;
3244
3245         subsys = target_core_subsystem[0];
3246
3247         lu_gp_cg = &alua_lu_gps_group;
3248         for (i = 0; lu_gp_cg->default_groups[i]; i++) {
3249                 item = &lu_gp_cg->default_groups[i]->cg_item;
3250                 lu_gp_cg->default_groups[i] = NULL;
3251                 config_item_put(item);
3252         }
3253         kfree(lu_gp_cg->default_groups);
3254         lu_gp_cg->default_groups = NULL;
3255
3256         alua_cg = &alua_group;
3257         for (i = 0; alua_cg->default_groups[i]; i++) {
3258                 item = &alua_cg->default_groups[i]->cg_item;
3259                 alua_cg->default_groups[i] = NULL;
3260                 config_item_put(item);
3261         }
3262         kfree(alua_cg->default_groups);
3263         alua_cg->default_groups = NULL;
3264
3265         hba_cg = &target_core_hbagroup;
3266         for (i = 0; hba_cg->default_groups[i]; i++) {
3267                 item = &hba_cg->default_groups[i]->cg_item;
3268                 hba_cg->default_groups[i] = NULL;
3269                 config_item_put(item);
3270         }
3271         kfree(hba_cg->default_groups);
3272         hba_cg->default_groups = NULL;
3273         /*
3274          * We expect subsys->su_group.default_groups to be released
3275          * by configfs subsystem provider logic..
3276          */
3277         configfs_unregister_subsystem(subsys);
3278         kfree(subsys->su_group.default_groups);
3279
3280         core_alua_free_lu_gp(default_lu_gp);
3281         default_lu_gp = NULL;
3282
3283         pr_debug("TARGET_CORE[0]: Released ConfigFS Fabric"
3284                         " Infrastructure\n");
3285
3286         core_dev_release_virtual_lun0();
3287         rd_module_exit();
3288         release_se_kmem_caches();
3289 }
3290
3291 MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
3292 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3293 MODULE_LICENSE("GPL");
3294
3295 module_init(target_core_init_configfs);
3296 module_exit(target_core_exit_configfs);