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.h>
  36 #include <scsi/scsi_cmnd.h>
  37
  38 #include <target/target_core_base.h>
  39 #include <target/target_core_backend.h>
  40 #include <target/target_core_fabric.h>
  41
  42 #include "target_core_internal.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                 spin_lock(&tpg->tpg_lun_lock);
 170         }
 171         spin_unlock(&tpg->tpg_lun_lock);
 172 }
 173
 174 /*      core_set_queue_depth_for_node():
 175  *
 176  *
 177  */
 178 static int core_set_queue_depth_for_node(
 179         struct se_portal_group *tpg,
 180         struct se_node_acl *acl)
 181 {
 182         if (!acl->queue_depth) {
 183                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 184                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 185                         acl->initiatorname);
 186                 acl->queue_depth = 1;
 187         }
 188
 189         return 0;
 190 }
 191
 192 void array_free(void *array, int n)
 193 {
 194         void **a = array;
 195         int i;
 196
 197         for (i = 0; i < n; i++)
 198                 kfree(a[i]);
 199         kfree(a);
 200 }
 201
 202 static void *array_zalloc(int n, size_t size, gfp_t flags)
 203 {
 204         void **a;
 205         int i;
 206
 207         a = kzalloc(n * sizeof(void*), flags);
 208         if (!a)
 209                 return NULL;
 210         for (i = 0; i < n; i++) {
 211                 a[i] = kzalloc(size, flags);
 212                 if (!a[i]) {
 213                         array_free(a, n);
 214                         return NULL;
 215                 }
 216         }
 217         return a;
 218 }
 219
 220 /*      core_create_device_list_for_node():
 221  *
 222  *
 223  */
 224 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 225 {
 226         struct se_dev_entry *deve;
 227         int i;
 228
 229         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 230                         sizeof(struct se_dev_entry), GFP_KERNEL);
 231         if (!nacl->device_list) {
 232                 pr_err("Unable to allocate memory for"
 233                         " struct se_node_acl->device_list\n");
 234                 return -ENOMEM;
 235         }
 236         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 237                 deve = nacl->device_list[i];
 238
 239                 atomic_set(&deve->ua_count, 0);
 240                 atomic_set(&deve->pr_ref_count, 0);
 241                 spin_lock_init(&deve->ua_lock);
 242                 INIT_LIST_HEAD(&deve->alua_port_list);
 243                 INIT_LIST_HEAD(&deve->ua_list);
 244         }
 245
 246         return 0;
 247 }
 248
 249 /*      core_tpg_check_initiator_node_acl()
 250  *
 251  *
 252  */
 253 struct se_node_acl *core_tpg_check_initiator_node_acl(
 254         struct se_portal_group *tpg,
 255         unsigned char *initiatorname)
 256 {
 257         struct se_node_acl *acl;
 258
 259         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 260         if (acl)
 261                 return acl;
 262
 263         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 264                 return NULL;
 265
 266         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 267         if (!acl)
 268                 return NULL;
 269
 270         INIT_LIST_HEAD(&acl->acl_list);
 271         INIT_LIST_HEAD(&acl->acl_sess_list);
 272         kref_init(&acl->acl_kref);
 273         init_completion(&acl->acl_free_comp);
 274         spin_lock_init(&acl->device_list_lock);
 275         spin_lock_init(&acl->nacl_sess_lock);
 276         atomic_set(&acl->acl_pr_ref_count, 0);
 277         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 278         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 279         acl->se_tpg = tpg;
 280         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 281         spin_lock_init(&acl->stats_lock);
 282         acl->dynamic_node_acl = 1;
 283
 284         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 285
 286         if (core_create_device_list_for_node(acl) < 0) {
 287                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 288                 return NULL;
 289         }
 290
 291         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 292                 core_free_device_list_for_node(acl, tpg);
 293                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 294                 return NULL;
 295         }
 296         /*
 297          * Here we only create demo-mode MappedLUNs from the active
 298          * TPG LUNs if the fabric is not explicitly asking for
 299          * tpg_check_demo_mode_login_only() == 1.
 300          */
 301         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 302             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 303                 core_tpg_add_node_to_devs(acl, tpg);
 304
 305         spin_lock_irq(&tpg->acl_node_lock);
 306         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 307         tpg->num_node_acls++;
 308         spin_unlock_irq(&tpg->acl_node_lock);
 309
 310         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 311                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 312                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 313                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 314
 315         return acl;
 316 }
 317 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 318
 319 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 320 {
 321         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 322                 cpu_relax();
 323 }
 324
 325 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 326 {
 327         int i;
 328         struct se_lun *lun;
 329
 330         spin_lock(&tpg->tpg_lun_lock);
 331         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 332                 lun = tpg->tpg_lun_list[i];
 333
 334                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 335                     (lun->lun_se_dev == NULL))
 336                         continue;
 337
 338                 spin_unlock(&tpg->tpg_lun_lock);
 339                 core_dev_del_lun(tpg, lun->unpacked_lun);
 340                 spin_lock(&tpg->tpg_lun_lock);
 341         }
 342         spin_unlock(&tpg->tpg_lun_lock);
 343 }
 344 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 345
 346 /*      core_tpg_add_initiator_node_acl():
 347  *
 348  *
 349  */
 350 struct se_node_acl *core_tpg_add_initiator_node_acl(
 351         struct se_portal_group *tpg,
 352         struct se_node_acl *se_nacl,
 353         const char *initiatorname,
 354         u32 queue_depth)
 355 {
 356         struct se_node_acl *acl = NULL;
 357
 358         spin_lock_irq(&tpg->acl_node_lock);
 359         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 360         if (acl) {
 361                 if (acl->dynamic_node_acl) {
 362                         acl->dynamic_node_acl = 0;
 363                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 364                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 365                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 366                         spin_unlock_irq(&tpg->acl_node_lock);
 367                         /*
 368                          * Release the locally allocated struct se_node_acl
 369                          * because * core_tpg_add_initiator_node_acl() returned
 370                          * a pointer to an existing demo mode node ACL.
 371                          */
 372                         if (se_nacl)
 373                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 374                                                         se_nacl);
 375                         goto done;
 376                 }
 377
 378                 pr_err("ACL entry for %s Initiator"
 379                         " Node %s already exists for TPG %u, ignoring"
 380                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 381                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 382                 spin_unlock_irq(&tpg->acl_node_lock);
 383                 return ERR_PTR(-EEXIST);
 384         }
 385         spin_unlock_irq(&tpg->acl_node_lock);
 386
 387         if (!se_nacl) {
 388                 pr_err("struct se_node_acl pointer is NULL\n");
 389                 return ERR_PTR(-EINVAL);
 390         }
 391         /*
 392          * For v4.x logic the se_node_acl_s is hanging off a fabric
 393          * dependent structure allocated via
 394          * struct target_core_fabric_ops->fabric_make_nodeacl()
 395          */
 396         acl = se_nacl;
 397
 398         INIT_LIST_HEAD(&acl->acl_list);
 399         INIT_LIST_HEAD(&acl->acl_sess_list);
 400         kref_init(&acl->acl_kref);
 401         init_completion(&acl->acl_free_comp);
 402         spin_lock_init(&acl->device_list_lock);
 403         spin_lock_init(&acl->nacl_sess_lock);
 404         atomic_set(&acl->acl_pr_ref_count, 0);
 405         acl->queue_depth = queue_depth;
 406         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 407         acl->se_tpg = tpg;
 408         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 409         spin_lock_init(&acl->stats_lock);
 410
 411         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 412
 413         if (core_create_device_list_for_node(acl) < 0) {
 414                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 415                 return ERR_PTR(-ENOMEM);
 416         }
 417
 418         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 419                 core_free_device_list_for_node(acl, tpg);
 420                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 421                 return ERR_PTR(-EINVAL);
 422         }
 423
 424         spin_lock_irq(&tpg->acl_node_lock);
 425         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 426         tpg->num_node_acls++;
 427         spin_unlock_irq(&tpg->acl_node_lock);
 428
 429 done:
 430         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 431                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 432                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 433                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 434
 435         return acl;
 436 }
 437 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 438
 439 /*      core_tpg_del_initiator_node_acl():
 440  *
 441  *
 442  */
 443 int core_tpg_del_initiator_node_acl(
 444         struct se_portal_group *tpg,
 445         struct se_node_acl *acl,
 446         int force)
 447 {
 448         LIST_HEAD(sess_list);
 449         struct se_session *sess, *sess_tmp;
 450         unsigned long flags;
 451         int rc;
 452
 453         spin_lock_irq(&tpg->acl_node_lock);
 454         if (acl->dynamic_node_acl) {
 455                 acl->dynamic_node_acl = 0;
 456         }
 457         list_del(&acl->acl_list);
 458         tpg->num_node_acls--;
 459         spin_unlock_irq(&tpg->acl_node_lock);
 460
 461         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 462         acl->acl_stop = 1;
 463
 464         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 465                                 sess_acl_list) {
 466                 if (sess->sess_tearing_down != 0)
 467                         continue;
 468
 469                 target_get_session(sess);
 470                 list_move(&sess->sess_acl_list, &sess_list);
 471         }
 472         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 473
 474         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 475                 list_del(&sess->sess_acl_list);
 476
 477                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 478                 target_put_session(sess);
 479                 if (!rc)
 480                         continue;
 481                 target_put_session(sess);
 482         }
 483         target_put_nacl(acl);
 484         /*
 485          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 486          * for active fabric session transport_deregister_session() callbacks.
 487          */
 488         wait_for_completion(&acl->acl_free_comp);
 489
 490         core_tpg_wait_for_nacl_pr_ref(acl);
 491         core_clear_initiator_node_from_tpg(acl, tpg);
 492         core_free_device_list_for_node(acl, tpg);
 493
 494         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 495                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 496                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 497                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 498
 499         return 0;
 500 }
 501 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 502
 503 /*      core_tpg_set_initiator_node_queue_depth():
 504  *
 505  *
 506  */
 507 int core_tpg_set_initiator_node_queue_depth(
 508         struct se_portal_group *tpg,
 509         unsigned char *initiatorname,
 510         u32 queue_depth,
 511         int force)
 512 {
 513         struct se_session *sess, *init_sess = NULL;
 514         struct se_node_acl *acl;
 515         unsigned long flags;
 516         int dynamic_acl = 0;
 517
 518         spin_lock_irq(&tpg->acl_node_lock);
 519         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 520         if (!acl) {
 521                 pr_err("Access Control List entry for %s Initiator"
 522                         " Node %s does not exists for TPG %hu, ignoring"
 523                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 524                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 525                 spin_unlock_irq(&tpg->acl_node_lock);
 526                 return -ENODEV;
 527         }
 528         if (acl->dynamic_node_acl) {
 529                 acl->dynamic_node_acl = 0;
 530                 dynamic_acl = 1;
 531         }
 532         spin_unlock_irq(&tpg->acl_node_lock);
 533
 534         spin_lock_irqsave(&tpg->session_lock, flags);
 535         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 536                 if (sess->se_node_acl != acl)
 537                         continue;
 538
 539                 if (!force) {
 540                         pr_err("Unable to change queue depth for %s"
 541                                 " Initiator Node: %s while session is"
 542                                 " operational.  To forcefully change the queue"
 543                                 " depth and force session reinstatement"
 544                                 " use the \"force=1\" parameter.\n",
 545                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 546                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 547
 548                         spin_lock_irq(&tpg->acl_node_lock);
 549                         if (dynamic_acl)
 550                                 acl->dynamic_node_acl = 1;
 551                         spin_unlock_irq(&tpg->acl_node_lock);
 552                         return -EEXIST;
 553                 }
 554                 /*
 555                  * Determine if the session needs to be closed by our context.
 556                  */
 557                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 558                         continue;
 559
 560                 init_sess = sess;
 561                 break;
 562         }
 563
 564         /*
 565          * User has requested to change the queue depth for a Initiator Node.
 566          * Change the value in the Node's struct se_node_acl, and call
 567          * core_set_queue_depth_for_node() to add the requested queue depth.
 568          *
 569          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 570          * reinstatement to occur if there is an active session for the
 571          * $FABRIC_MOD Initiator Node in question.
 572          */
 573         acl->queue_depth = queue_depth;
 574
 575         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 576                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 577                 /*
 578                  * Force session reinstatement if
 579                  * core_set_queue_depth_for_node() failed, because we assume
 580                  * the $FABRIC_MOD has already the set session reinstatement
 581                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 582                  */
 583                 if (init_sess)
 584                         tpg->se_tpg_tfo->close_session(init_sess);
 585
 586                 spin_lock_irq(&tpg->acl_node_lock);
 587                 if (dynamic_acl)
 588                         acl->dynamic_node_acl = 1;
 589                 spin_unlock_irq(&tpg->acl_node_lock);
 590                 return -EINVAL;
 591         }
 592         spin_unlock_irqrestore(&tpg->session_lock, flags);
 593         /*
 594          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 595          * forcefully shutdown the $FABRIC_MOD session/nexus.
 596          */
 597         if (init_sess)
 598                 tpg->se_tpg_tfo->close_session(init_sess);
 599
 600         pr_debug("Successfully changed queue depth to: %d for Initiator"
 601                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 602                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 603                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 604
 605         spin_lock_irq(&tpg->acl_node_lock);
 606         if (dynamic_acl)
 607                 acl->dynamic_node_acl = 1;
 608         spin_unlock_irq(&tpg->acl_node_lock);
 609
 610         return 0;
 611 }
 612 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 613
 614 /*      core_tpg_set_initiator_node_tag():
 615  *
 616  *      Initiator nodeacl tags are not used internally, but may be used by
 617  *      userspace to emulate aliases or groups.
 618  *      Returns length of newly-set tag or -EINVAL.
 619  */
 620 int core_tpg_set_initiator_node_tag(
 621         struct se_portal_group *tpg,
 622         struct se_node_acl *acl,
 623         const char *new_tag)
 624 {
 625         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 626                 return -EINVAL;
 627
 628         if (!strncmp("NULL", new_tag, 4)) {
 629                 acl->acl_tag[0] = '\0';
 630                 return 0;
 631         }
 632
 633         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 634 }
 635 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 636
 637 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 638 {
 639         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 640
 641         complete(&lun->lun_ref_comp);
 642 }
 643
 644 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 645 {
 646         /* Set in core_dev_setup_virtual_lun0() */
 647         struct se_device *dev = g_lun0_dev;
 648         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 649         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 650         int ret;
 651
 652         lun->unpacked_lun = 0;
 653         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 654         atomic_set(&lun->lun_acl_count, 0);
 655         init_completion(&lun->lun_shutdown_comp);
 656         INIT_LIST_HEAD(&lun->lun_acl_list);
 657         spin_lock_init(&lun->lun_acl_lock);
 658         spin_lock_init(&lun->lun_sep_lock);
 659         init_completion(&lun->lun_ref_comp);
 660
 661         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release);
 662         if (ret < 0)
 663                 return ret;
 664
 665         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 666         if (ret < 0) {
 667                 percpu_ref_cancel_init(&lun->lun_ref);
 668                 return ret;
 669         }
 670
 671         return 0;
 672 }
 673
 674 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 675 {
 676         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 677
 678         core_tpg_post_dellun(se_tpg, lun);
 679 }
 680
 681 int core_tpg_register(
 682         struct target_core_fabric_ops *tfo,
 683         struct se_wwn *se_wwn,
 684         struct se_portal_group *se_tpg,
 685         void *tpg_fabric_ptr,
 686         int se_tpg_type)
 687 {
 688         struct se_lun *lun;
 689         u32 i;
 690
 691         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 692                         sizeof(struct se_lun), GFP_KERNEL);
 693         if (!se_tpg->tpg_lun_list) {
 694                 pr_err("Unable to allocate struct se_portal_group->"
 695                                 "tpg_lun_list\n");
 696                 return -ENOMEM;
 697         }
 698
 699         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 700                 lun = se_tpg->tpg_lun_list[i];
 701                 lun->unpacked_lun = i;
 702                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 703                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 704                 atomic_set(&lun->lun_acl_count, 0);
 705                 init_completion(&lun->lun_shutdown_comp);
 706                 INIT_LIST_HEAD(&lun->lun_acl_list);
 707                 spin_lock_init(&lun->lun_acl_lock);
 708                 spin_lock_init(&lun->lun_sep_lock);
 709                 init_completion(&lun->lun_ref_comp);
 710         }
 711
 712         se_tpg->se_tpg_type = se_tpg_type;
 713         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 714         se_tpg->se_tpg_tfo = tfo;
 715         se_tpg->se_tpg_wwn = se_wwn;
 716         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 717         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 718         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 719         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 720         spin_lock_init(&se_tpg->acl_node_lock);
 721         spin_lock_init(&se_tpg->session_lock);
 722         spin_lock_init(&se_tpg->tpg_lun_lock);
 723
 724         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 725                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 726                         array_free(se_tpg->tpg_lun_list,
 727                                    TRANSPORT_MAX_LUNS_PER_TPG);
 728                         return -ENOMEM;
 729                 }
 730         }
 731
 732         spin_lock_bh(&tpg_lock);
 733         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 734         spin_unlock_bh(&tpg_lock);
 735
 736         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 737                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 738                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 739                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 740                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 741
 742         return 0;
 743 }
 744 EXPORT_SYMBOL(core_tpg_register);
 745
 746 int core_tpg_deregister(struct se_portal_group *se_tpg)
 747 {
 748         struct se_node_acl *nacl, *nacl_tmp;
 749
 750         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 751                 " for endpoint: %s Portal Tag %u\n",
 752                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 753                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 754                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 755                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 756
 757         spin_lock_bh(&tpg_lock);
 758         list_del(&se_tpg->se_tpg_node);
 759         spin_unlock_bh(&tpg_lock);
 760
 761         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 762                 cpu_relax();
 763         /*
 764          * Release any remaining demo-mode generated se_node_acl that have
 765          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 766          * in transport_deregister_session().
 767          */
 768         spin_lock_irq(&se_tpg->acl_node_lock);
 769         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 770                         acl_list) {
 771                 list_del(&nacl->acl_list);
 772                 se_tpg->num_node_acls--;
 773                 spin_unlock_irq(&se_tpg->acl_node_lock);
 774
 775                 core_tpg_wait_for_nacl_pr_ref(nacl);
 776                 core_free_device_list_for_node(nacl, se_tpg);
 777                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 778
 779                 spin_lock_irq(&se_tpg->acl_node_lock);
 780         }
 781         spin_unlock_irq(&se_tpg->acl_node_lock);
 782
 783         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 784                 core_tpg_release_virtual_lun0(se_tpg);
 785
 786         se_tpg->se_tpg_fabric_ptr = NULL;
 787         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 788         return 0;
 789 }
 790 EXPORT_SYMBOL(core_tpg_deregister);
 791
 792 struct se_lun *core_tpg_pre_addlun(
 793         struct se_portal_group *tpg,
 794         u32 unpacked_lun)
 795 {
 796         struct se_lun *lun;
 797
 798         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 799                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 800                         "-1: %u for Target Portal Group: %u\n",
 801                         tpg->se_tpg_tfo->get_fabric_name(),
 802                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 803                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 804                 return ERR_PTR(-EOVERFLOW);
 805         }
 806
 807         spin_lock(&tpg->tpg_lun_lock);
 808         lun = tpg->tpg_lun_list[unpacked_lun];
 809         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 810                 pr_err("TPG Logical Unit Number: %u is already active"
 811                         " on %s Target Portal Group: %u, ignoring request.\n",
 812                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 813                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 814                 spin_unlock(&tpg->tpg_lun_lock);
 815                 return ERR_PTR(-EINVAL);
 816         }
 817         spin_unlock(&tpg->tpg_lun_lock);
 818
 819         return lun;
 820 }
 821
 822 int core_tpg_post_addlun(
 823         struct se_portal_group *tpg,
 824         struct se_lun *lun,
 825         u32 lun_access,
 826         void *lun_ptr)
 827 {
 828         int ret;
 829
 830         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release);
 831         if (ret < 0)
 832                 return ret;
 833
 834         ret = core_dev_export(lun_ptr, tpg, lun);
 835         if (ret < 0) {
 836                 percpu_ref_cancel_init(&lun->lun_ref);
 837                 return ret;
 838         }
 839
 840         spin_lock(&tpg->tpg_lun_lock);
 841         lun->lun_access = lun_access;
 842         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 843         spin_unlock(&tpg->tpg_lun_lock);
 844
 845         return 0;
 846 }
 847
 848 struct se_lun *core_tpg_pre_dellun(
 849         struct se_portal_group *tpg,
 850         u32 unpacked_lun)
 851 {
 852         struct se_lun *lun;
 853
 854         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 855                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 856                         "-1: %u for Target Portal Group: %u\n",
 857                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 858                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 859                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 860                 return ERR_PTR(-EOVERFLOW);
 861         }
 862
 863         spin_lock(&tpg->tpg_lun_lock);
 864         lun = tpg->tpg_lun_list[unpacked_lun];
 865         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 866                 pr_err("%s Logical Unit Number: %u is not active on"
 867                         " Target Portal Group: %u, ignoring request.\n",
 868                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 869                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 870                 spin_unlock(&tpg->tpg_lun_lock);
 871                 return ERR_PTR(-ENODEV);
 872         }
 873         spin_unlock(&tpg->tpg_lun_lock);
 874
 875         return lun;
 876 }
 877
 878 int core_tpg_post_dellun(
 879         struct se_portal_group *tpg,
 880         struct se_lun *lun)
 881 {
 882         core_clear_lun_from_tpg(lun, tpg);
 883         transport_clear_lun_ref(lun);
 884
 885         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 886
 887         spin_lock(&tpg->tpg_lun_lock);
 888         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 889         spin_unlock(&tpg->tpg_lun_lock);
 890
 891         return 0;
 892 }