drivers/target/target_core_tpg.c

   1 /*******************************************************************************
   2  * Filename:  target_core_tpg.c
   3  *
   4  * This file contains generic Target Portal Group related functions.
   5  *
   6  * (c) Copyright 2002-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/net.h>
  27 #include <linux/string.h>
  28 #include <linux/timer.h>
  29 #include <linux/slab.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/in.h>
  32 #include <linux/export.h>
  33 #include <net/sock.h>
  34 #include <net/tcp.h>
  35 #include <scsi/scsi_proto.h>
  36
  37 #include <target/target_core_base.h>
  38 #include <target/target_core_backend.h>
  39 #include <target/target_core_fabric.h>
  40
  41 #include "target_core_internal.h"
  42 #include "target_core_pr.h"
  43
  44 extern struct se_device *g_lun0_dev;
  45
  46 static DEFINE_SPINLOCK(tpg_lock);
  47 static LIST_HEAD(tpg_list);
  48
  49 /*      core_clear_initiator_node_from_tpg():
  50  *
  51  *
  52  */
  53 static void core_clear_initiator_node_from_tpg(
  54         struct se_node_acl *nacl,
  55         struct se_portal_group *tpg)
  56 {
  57         int i;
  58         struct se_dev_entry *deve;
  59         struct se_lun *lun;
  60
  61         spin_lock_irq(&nacl->device_list_lock);
  62         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  63                 deve = nacl->device_list[i];
  64
  65                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  66                         continue;
  67
  68                 if (!deve->se_lun) {
  69                         pr_err("%s device entries device pointer is"
  70                                 " NULL, but Initiator has access.\n",
  71                                 tpg->se_tpg_tfo->get_fabric_name());
  72                         continue;
  73                 }
  74
  75                 lun = deve->se_lun;
  76                 spin_unlock_irq(&nacl->device_list_lock);
  77                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
  78                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
  79
  80                 spin_lock_irq(&nacl->device_list_lock);
  81         }
  82         spin_unlock_irq(&nacl->device_list_lock);
  83 }
  84
  85 /*      __core_tpg_get_initiator_node_acl():
  86  *
  87  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  88  */
  89 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  90         struct se_portal_group *tpg,
  91         const char *initiatorname)
  92 {
  93         struct se_node_acl *acl;
  94
  95         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  96                 if (!strcmp(acl->initiatorname, initiatorname))
  97                         return acl;
  98         }
  99
 100         return NULL;
 101 }
 102
 103 /*      core_tpg_get_initiator_node_acl():
 104  *
 105  *
 106  */
 107 struct se_node_acl *core_tpg_get_initiator_node_acl(
 108         struct se_portal_group *tpg,
 109         unsigned char *initiatorname)
 110 {
 111         struct se_node_acl *acl;
 112
 113         spin_lock_irq(&tpg->acl_node_lock);
 114         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 115         spin_unlock_irq(&tpg->acl_node_lock);
 116
 117         return acl;
 118 }
 119 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
 120
 121 /*      core_tpg_add_node_to_devs():
 122  *
 123  *
 124  */
 125 void core_tpg_add_node_to_devs(
 126         struct se_node_acl *acl,
 127         struct se_portal_group *tpg)
 128 {
 129         int i = 0;
 130         u32 lun_access = 0;
 131         struct se_lun *lun;
 132         struct se_device *dev;
 133
 134         spin_lock(&tpg->tpg_lun_lock);
 135         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 136                 lun = tpg->tpg_lun_list[i];
 137                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 138                         continue;
 139
 140                 spin_unlock(&tpg->tpg_lun_lock);
 141
 142                 dev = lun->lun_se_dev;
 143                 /*
 144                  * By default in LIO-Target $FABRIC_MOD,
 145                  * demo_mode_write_protect is ON, or READ_ONLY;
 146                  */
 147                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 148                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 149                 } else {
 150                         /*
 151                          * Allow only optical drives to issue R/W in default RO
 152                          * demo mode.
 153                          */
 154                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 155                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 156                         else
 157                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 158                 }
 159
 160                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 161                         " access for LUN in Demo Mode\n",
 162                         tpg->se_tpg_tfo->get_fabric_name(),
 163                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 164                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 165                         "READ-WRITE" : "READ-ONLY");
 166
 167                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 168                                 lun_access, acl, tpg);
 169                 /*
 170                  * Check to see if there are any existing persistent reservation
 171                  * APTPL pre-registrations that need to be enabled for this dynamic
 172                  * LUN ACL now..
 173                  */
 174                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 175                                                     lun->unpacked_lun);
 176                 spin_lock(&tpg->tpg_lun_lock);
 177         }
 178         spin_unlock(&tpg->tpg_lun_lock);
 179 }
 180
 181 /*      core_set_queue_depth_for_node():
 182  *
 183  *
 184  */
 185 static int core_set_queue_depth_for_node(
 186         struct se_portal_group *tpg,
 187         struct se_node_acl *acl)
 188 {
 189         if (!acl->queue_depth) {
 190                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 191                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 192                         acl->initiatorname);
 193                 acl->queue_depth = 1;
 194         }
 195
 196         return 0;
 197 }
 198
 199 void array_free(void *array, int n)
 200 {
 201         void **a = array;
 202         int i;
 203
 204         for (i = 0; i < n; i++)
 205                 kfree(a[i]);
 206         kfree(a);
 207 }
 208
 209 static void *array_zalloc(int n, size_t size, gfp_t flags)
 210 {
 211         void **a;
 212         int i;
 213
 214         a = kzalloc(n * sizeof(void*), flags);
 215         if (!a)
 216                 return NULL;
 217         for (i = 0; i < n; i++) {
 218                 a[i] = kzalloc(size, flags);
 219                 if (!a[i]) {
 220                         array_free(a, n);
 221                         return NULL;
 222                 }
 223         }
 224         return a;
 225 }
 226
 227 /*      core_create_device_list_for_node():
 228  *
 229  *
 230  */
 231 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 232 {
 233         struct se_dev_entry *deve;
 234         int i;
 235
 236         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 237                         sizeof(struct se_dev_entry), GFP_KERNEL);
 238         if (!nacl->device_list) {
 239                 pr_err("Unable to allocate memory for"
 240                         " struct se_node_acl->device_list\n");
 241                 return -ENOMEM;
 242         }
 243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 244                 deve = nacl->device_list[i];
 245
 246                 atomic_set(&deve->ua_count, 0);
 247                 atomic_set(&deve->pr_ref_count, 0);
 248                 spin_lock_init(&deve->ua_lock);
 249                 INIT_LIST_HEAD(&deve->alua_port_list);
 250                 INIT_LIST_HEAD(&deve->ua_list);
 251         }
 252
 253         return 0;
 254 }
 255
 256 /*      core_tpg_check_initiator_node_acl()
 257  *
 258  *
 259  */
 260 struct se_node_acl *core_tpg_check_initiator_node_acl(
 261         struct se_portal_group *tpg,
 262         unsigned char *initiatorname)
 263 {
 264         struct se_node_acl *acl;
 265
 266         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 267         if (acl)
 268                 return acl;
 269
 270         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 271                 return NULL;
 272
 273         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 274         if (!acl)
 275                 return NULL;
 276
 277         INIT_LIST_HEAD(&acl->acl_list);
 278         INIT_LIST_HEAD(&acl->acl_sess_list);
 279         kref_init(&acl->acl_kref);
 280         init_completion(&acl->acl_free_comp);
 281         spin_lock_init(&acl->device_list_lock);
 282         spin_lock_init(&acl->nacl_sess_lock);
 283         atomic_set(&acl->acl_pr_ref_count, 0);
 284         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 285         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 286         acl->se_tpg = tpg;
 287         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 288         acl->dynamic_node_acl = 1;
 289
 290         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 291
 292         if (core_create_device_list_for_node(acl) < 0) {
 293                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 294                 return NULL;
 295         }
 296
 297         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 298                 core_free_device_list_for_node(acl, tpg);
 299                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 300                 return NULL;
 301         }
 302         /*
 303          * Here we only create demo-mode MappedLUNs from the active
 304          * TPG LUNs if the fabric is not explicitly asking for
 305          * tpg_check_demo_mode_login_only() == 1.
 306          */
 307         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 308             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 309                 core_tpg_add_node_to_devs(acl, tpg);
 310
 311         spin_lock_irq(&tpg->acl_node_lock);
 312         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 313         tpg->num_node_acls++;
 314         spin_unlock_irq(&tpg->acl_node_lock);
 315
 316         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 317                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 318                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 319                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 320
 321         return acl;
 322 }
 323 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 324
 325 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 326 {
 327         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 328                 cpu_relax();
 329 }
 330
 331 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 332 {
 333         int i;
 334         struct se_lun *lun;
 335
 336         spin_lock(&tpg->tpg_lun_lock);
 337         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 338                 lun = tpg->tpg_lun_list[i];
 339
 340                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 341                     (lun->lun_se_dev == NULL))
 342                         continue;
 343
 344                 spin_unlock(&tpg->tpg_lun_lock);
 345                 core_dev_del_lun(tpg, lun);
 346                 spin_lock(&tpg->tpg_lun_lock);
 347         }
 348         spin_unlock(&tpg->tpg_lun_lock);
 349 }
 350 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 351
 352 /*      core_tpg_add_initiator_node_acl():
 353  *
 354  *
 355  */
 356 struct se_node_acl *core_tpg_add_initiator_node_acl(
 357         struct se_portal_group *tpg,
 358         struct se_node_acl *se_nacl,
 359         const char *initiatorname,
 360         u32 queue_depth)
 361 {
 362         struct se_node_acl *acl = NULL;
 363
 364         spin_lock_irq(&tpg->acl_node_lock);
 365         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 366         if (acl) {
 367                 if (acl->dynamic_node_acl) {
 368                         acl->dynamic_node_acl = 0;
 369                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 370                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 371                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 372                         spin_unlock_irq(&tpg->acl_node_lock);
 373                         /*
 374                          * Release the locally allocated struct se_node_acl
 375                          * because * core_tpg_add_initiator_node_acl() returned
 376                          * a pointer to an existing demo mode node ACL.
 377                          */
 378                         if (se_nacl)
 379                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 380                                                         se_nacl);
 381                         goto done;
 382                 }
 383
 384                 pr_err("ACL entry for %s Initiator"
 385                         " Node %s already exists for TPG %u, ignoring"
 386                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 387                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 388                 spin_unlock_irq(&tpg->acl_node_lock);
 389                 return ERR_PTR(-EEXIST);
 390         }
 391         spin_unlock_irq(&tpg->acl_node_lock);
 392
 393         if (!se_nacl) {
 394                 pr_err("struct se_node_acl pointer is NULL\n");
 395                 return ERR_PTR(-EINVAL);
 396         }
 397         /*
 398          * For v4.x logic the se_node_acl_s is hanging off a fabric
 399          * dependent structure allocated via
 400          * struct target_core_fabric_ops->fabric_make_nodeacl()
 401          */
 402         acl = se_nacl;
 403
 404         INIT_LIST_HEAD(&acl->acl_list);
 405         INIT_LIST_HEAD(&acl->acl_sess_list);
 406         kref_init(&acl->acl_kref);
 407         init_completion(&acl->acl_free_comp);
 408         spin_lock_init(&acl->device_list_lock);
 409         spin_lock_init(&acl->nacl_sess_lock);
 410         atomic_set(&acl->acl_pr_ref_count, 0);
 411         acl->queue_depth = queue_depth;
 412         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 413         acl->se_tpg = tpg;
 414         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 415
 416         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 417
 418         if (core_create_device_list_for_node(acl) < 0) {
 419                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 420                 return ERR_PTR(-ENOMEM);
 421         }
 422
 423         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 424                 core_free_device_list_for_node(acl, tpg);
 425                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 426                 return ERR_PTR(-EINVAL);
 427         }
 428
 429         spin_lock_irq(&tpg->acl_node_lock);
 430         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 431         tpg->num_node_acls++;
 432         spin_unlock_irq(&tpg->acl_node_lock);
 433
 434 done:
 435         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 436                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 437                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 438                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 439
 440         return acl;
 441 }
 442 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 443
 444 /*      core_tpg_del_initiator_node_acl():
 445  *
 446  *
 447  */
 448 int core_tpg_del_initiator_node_acl(
 449         struct se_portal_group *tpg,
 450         struct se_node_acl *acl,
 451         int force)
 452 {
 453         LIST_HEAD(sess_list);
 454         struct se_session *sess, *sess_tmp;
 455         unsigned long flags;
 456         int rc;
 457
 458         spin_lock_irq(&tpg->acl_node_lock);
 459         if (acl->dynamic_node_acl) {
 460                 acl->dynamic_node_acl = 0;
 461         }
 462         list_del(&acl->acl_list);
 463         tpg->num_node_acls--;
 464         spin_unlock_irq(&tpg->acl_node_lock);
 465
 466         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 467         acl->acl_stop = 1;
 468
 469         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 470                                 sess_acl_list) {
 471                 if (sess->sess_tearing_down != 0)
 472                         continue;
 473
 474                 target_get_session(sess);
 475                 list_move(&sess->sess_acl_list, &sess_list);
 476         }
 477         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 478
 479         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 480                 list_del(&sess->sess_acl_list);
 481
 482                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 483                 target_put_session(sess);
 484                 if (!rc)
 485                         continue;
 486                 target_put_session(sess);
 487         }
 488         target_put_nacl(acl);
 489         /*
 490          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 491          * for active fabric session transport_deregister_session() callbacks.
 492          */
 493         wait_for_completion(&acl->acl_free_comp);
 494
 495         core_tpg_wait_for_nacl_pr_ref(acl);
 496         core_clear_initiator_node_from_tpg(acl, tpg);
 497         core_free_device_list_for_node(acl, tpg);
 498
 499         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 500                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 501                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 502                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 503
 504         return 0;
 505 }
 506 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 507
 508 /*      core_tpg_set_initiator_node_queue_depth():
 509  *
 510  *
 511  */
 512 int core_tpg_set_initiator_node_queue_depth(
 513         struct se_portal_group *tpg,
 514         unsigned char *initiatorname,
 515         u32 queue_depth,
 516         int force)
 517 {
 518         struct se_session *sess, *init_sess = NULL;
 519         struct se_node_acl *acl;
 520         unsigned long flags;
 521         int dynamic_acl = 0;
 522
 523         spin_lock_irq(&tpg->acl_node_lock);
 524         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 525         if (!acl) {
 526                 pr_err("Access Control List entry for %s Initiator"
 527                         " Node %s does not exists for TPG %hu, ignoring"
 528                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 529                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 530                 spin_unlock_irq(&tpg->acl_node_lock);
 531                 return -ENODEV;
 532         }
 533         if (acl->dynamic_node_acl) {
 534                 acl->dynamic_node_acl = 0;
 535                 dynamic_acl = 1;
 536         }
 537         spin_unlock_irq(&tpg->acl_node_lock);
 538
 539         spin_lock_irqsave(&tpg->session_lock, flags);
 540         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 541                 if (sess->se_node_acl != acl)
 542                         continue;
 543
 544                 if (!force) {
 545                         pr_err("Unable to change queue depth for %s"
 546                                 " Initiator Node: %s while session is"
 547                                 " operational.  To forcefully change the queue"
 548                                 " depth and force session reinstatement"
 549                                 " use the \"force=1\" parameter.\n",
 550                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 551                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 552
 553                         spin_lock_irq(&tpg->acl_node_lock);
 554                         if (dynamic_acl)
 555                                 acl->dynamic_node_acl = 1;
 556                         spin_unlock_irq(&tpg->acl_node_lock);
 557                         return -EEXIST;
 558                 }
 559                 /*
 560                  * Determine if the session needs to be closed by our context.
 561                  */
 562                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 563                         continue;
 564
 565                 init_sess = sess;
 566                 break;
 567         }
 568
 569         /*
 570          * User has requested to change the queue depth for a Initiator Node.
 571          * Change the value in the Node's struct se_node_acl, and call
 572          * core_set_queue_depth_for_node() to add the requested queue depth.
 573          *
 574          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 575          * reinstatement to occur if there is an active session for the
 576          * $FABRIC_MOD Initiator Node in question.
 577          */
 578         acl->queue_depth = queue_depth;
 579
 580         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 581                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 582                 /*
 583                  * Force session reinstatement if
 584                  * core_set_queue_depth_for_node() failed, because we assume
 585                  * the $FABRIC_MOD has already the set session reinstatement
 586                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 587                  */
 588                 if (init_sess)
 589                         tpg->se_tpg_tfo->close_session(init_sess);
 590
 591                 spin_lock_irq(&tpg->acl_node_lock);
 592                 if (dynamic_acl)
 593                         acl->dynamic_node_acl = 1;
 594                 spin_unlock_irq(&tpg->acl_node_lock);
 595                 return -EINVAL;
 596         }
 597         spin_unlock_irqrestore(&tpg->session_lock, flags);
 598         /*
 599          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 600          * forcefully shutdown the $FABRIC_MOD session/nexus.
 601          */
 602         if (init_sess)
 603                 tpg->se_tpg_tfo->close_session(init_sess);
 604
 605         pr_debug("Successfully changed queue depth to: %d for Initiator"
 606                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 607                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 608                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 609
 610         spin_lock_irq(&tpg->acl_node_lock);
 611         if (dynamic_acl)
 612                 acl->dynamic_node_acl = 1;
 613         spin_unlock_irq(&tpg->acl_node_lock);
 614
 615         return 0;
 616 }
 617 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 618
 619 /*      core_tpg_set_initiator_node_tag():
 620  *
 621  *      Initiator nodeacl tags are not used internally, but may be used by
 622  *      userspace to emulate aliases or groups.
 623  *      Returns length of newly-set tag or -EINVAL.
 624  */
 625 int core_tpg_set_initiator_node_tag(
 626         struct se_portal_group *tpg,
 627         struct se_node_acl *acl,
 628         const char *new_tag)
 629 {
 630         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 631                 return -EINVAL;
 632
 633         if (!strncmp("NULL", new_tag, 4)) {
 634                 acl->acl_tag[0] = '\0';
 635                 return 0;
 636         }
 637
 638         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 639 }
 640 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 641
 642 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 643 {
 644         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 645
 646         complete(&lun->lun_ref_comp);
 647 }
 648
 649 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 650 {
 651         /* Set in core_dev_setup_virtual_lun0() */
 652         struct se_device *dev = g_lun0_dev;
 653         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 654         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 655         int ret;
 656
 657         lun->unpacked_lun = 0;
 658         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 659         atomic_set(&lun->lun_acl_count, 0);
 660         init_completion(&lun->lun_shutdown_comp);
 661         INIT_LIST_HEAD(&lun->lun_acl_list);
 662         spin_lock_init(&lun->lun_acl_lock);
 663         spin_lock_init(&lun->lun_sep_lock);
 664         init_completion(&lun->lun_ref_comp);
 665
 666         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 667         if (ret < 0)
 668                 return ret;
 669
 670         return 0;
 671 }
 672
 673 int core_tpg_register(
 674         const struct target_core_fabric_ops *tfo,
 675         struct se_wwn *se_wwn,
 676         struct se_portal_group *se_tpg,
 677         void *tpg_fabric_ptr,
 678         int se_tpg_type)
 679 {
 680         struct se_lun *lun;
 681         u32 i;
 682
 683         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 684                         sizeof(struct se_lun), GFP_KERNEL);
 685         if (!se_tpg->tpg_lun_list) {
 686                 pr_err("Unable to allocate struct se_portal_group->"
 687                                 "tpg_lun_list\n");
 688                 return -ENOMEM;
 689         }
 690
 691         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 692                 lun = se_tpg->tpg_lun_list[i];
 693                 lun->unpacked_lun = i;
 694                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 695                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 696                 atomic_set(&lun->lun_acl_count, 0);
 697                 init_completion(&lun->lun_shutdown_comp);
 698                 INIT_LIST_HEAD(&lun->lun_acl_list);
 699                 spin_lock_init(&lun->lun_acl_lock);
 700                 spin_lock_init(&lun->lun_sep_lock);
 701                 init_completion(&lun->lun_ref_comp);
 702         }
 703
 704         se_tpg->se_tpg_type = se_tpg_type;
 705         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 706         se_tpg->se_tpg_tfo = tfo;
 707         se_tpg->se_tpg_wwn = se_wwn;
 708         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 709         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 710         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 711         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 712         spin_lock_init(&se_tpg->acl_node_lock);
 713         spin_lock_init(&se_tpg->session_lock);
 714         spin_lock_init(&se_tpg->tpg_lun_lock);
 715
 716         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 717                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 718                         array_free(se_tpg->tpg_lun_list,
 719                                    TRANSPORT_MAX_LUNS_PER_TPG);
 720                         return -ENOMEM;
 721                 }
 722         }
 723
 724         spin_lock_bh(&tpg_lock);
 725         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 726         spin_unlock_bh(&tpg_lock);
 727
 728         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 729                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 730                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 731                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 732                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 733
 734         return 0;
 735 }
 736 EXPORT_SYMBOL(core_tpg_register);
 737
 738 int core_tpg_deregister(struct se_portal_group *se_tpg)
 739 {
 740         struct se_node_acl *nacl, *nacl_tmp;
 741
 742         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 743                 " for endpoint: %s Portal Tag %u\n",
 744                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 745                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 746                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 747                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 748
 749         spin_lock_bh(&tpg_lock);
 750         list_del(&se_tpg->se_tpg_node);
 751         spin_unlock_bh(&tpg_lock);
 752
 753         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 754                 cpu_relax();
 755         /*
 756          * Release any remaining demo-mode generated se_node_acl that have
 757          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 758          * in transport_deregister_session().
 759          */
 760         spin_lock_irq(&se_tpg->acl_node_lock);
 761         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 762                         acl_list) {
 763                 list_del(&nacl->acl_list);
 764                 se_tpg->num_node_acls--;
 765                 spin_unlock_irq(&se_tpg->acl_node_lock);
 766
 767                 core_tpg_wait_for_nacl_pr_ref(nacl);
 768                 core_free_device_list_for_node(nacl, se_tpg);
 769                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 770
 771                 spin_lock_irq(&se_tpg->acl_node_lock);
 772         }
 773         spin_unlock_irq(&se_tpg->acl_node_lock);
 774
 775         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 776                 core_tpg_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
 777
 778         se_tpg->se_tpg_fabric_ptr = NULL;
 779         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 780         return 0;
 781 }
 782 EXPORT_SYMBOL(core_tpg_deregister);
 783
 784 struct se_lun *core_tpg_alloc_lun(
 785         struct se_portal_group *tpg,
 786         u32 unpacked_lun)
 787 {
 788         struct se_lun *lun;
 789
 790         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 791                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 792                         "-1: %u for Target Portal Group: %u\n",
 793                         tpg->se_tpg_tfo->get_fabric_name(),
 794                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 795                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 796                 return ERR_PTR(-EOVERFLOW);
 797         }
 798
 799         spin_lock(&tpg->tpg_lun_lock);
 800         lun = tpg->tpg_lun_list[unpacked_lun];
 801         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 802                 pr_err("TPG Logical Unit Number: %u is already active"
 803                         " on %s Target Portal Group: %u, ignoring request.\n",
 804                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 805                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 806                 spin_unlock(&tpg->tpg_lun_lock);
 807                 return ERR_PTR(-EINVAL);
 808         }
 809         spin_unlock(&tpg->tpg_lun_lock);
 810
 811         return lun;
 812 }
 813
 814 int core_tpg_add_lun(
 815         struct se_portal_group *tpg,
 816         struct se_lun *lun,
 817         u32 lun_access,
 818         struct se_device *dev)
 819 {
 820         int ret;
 821
 822         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 823                               GFP_KERNEL);
 824         if (ret < 0)
 825                 return ret;
 826
 827         ret = core_dev_export(dev, tpg, lun);
 828         if (ret < 0) {
 829                 percpu_ref_exit(&lun->lun_ref);
 830                 return ret;
 831         }
 832
 833         spin_lock(&tpg->tpg_lun_lock);
 834         lun->lun_access = lun_access;
 835         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 836         spin_unlock(&tpg->tpg_lun_lock);
 837
 838         return 0;
 839 }
 840
 841 void core_tpg_remove_lun(
 842         struct se_portal_group *tpg,
 843         struct se_lun *lun)
 844 {
 845         core_clear_lun_from_tpg(lun, tpg);
 846         transport_clear_lun_ref(lun);
 847
 848         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 849
 850         spin_lock(&tpg->tpg_lun_lock);
 851         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 852         spin_unlock(&tpg->tpg_lun_lock);
 853
 854         percpu_ref_exit(&lun->lun_ref);
 855 }