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 2002-2012 RisingTide Systems LLC.
   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
 120 /*      core_tpg_add_node_to_devs():
 121  *
 122  *
 123  */
 124 void core_tpg_add_node_to_devs(
 125         struct se_node_acl *acl,
 126         struct se_portal_group *tpg)
 127 {
 128         int i = 0;
 129         u32 lun_access = 0;
 130         struct se_lun *lun;
 131         struct se_device *dev;
 132
 133         spin_lock(&tpg->tpg_lun_lock);
 134         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 135                 lun = tpg->tpg_lun_list[i];
 136                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 137                         continue;
 138
 139                 spin_unlock(&tpg->tpg_lun_lock);
 140
 141                 dev = lun->lun_se_dev;
 142                 /*
 143                  * By default in LIO-Target $FABRIC_MOD,
 144                  * demo_mode_write_protect is ON, or READ_ONLY;
 145                  */
 146                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 147                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 148                 } else {
 149                         /*
 150                          * Allow only optical drives to issue R/W in default RO
 151                          * demo mode.
 152                          */
 153                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 154                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 155                         else
 156                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 157                 }
 158
 159                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 160                         " access for LUN in Demo Mode\n",
 161                         tpg->se_tpg_tfo->get_fabric_name(),
 162                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 163                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 164                         "READ-WRITE" : "READ-ONLY");
 165
 166                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 167                                 lun_access, acl, tpg);
 168                 spin_lock(&tpg->tpg_lun_lock);
 169         }
 170         spin_unlock(&tpg->tpg_lun_lock);
 171 }
 172
 173 /*      core_set_queue_depth_for_node():
 174  *
 175  *
 176  */
 177 static int core_set_queue_depth_for_node(
 178         struct se_portal_group *tpg,
 179         struct se_node_acl *acl)
 180 {
 181         if (!acl->queue_depth) {
 182                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 183                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 184                         acl->initiatorname);
 185                 acl->queue_depth = 1;
 186         }
 187
 188         return 0;
 189 }
 190
 191 void array_free(void *array, int n)
 192 {
 193         void **a = array;
 194         int i;
 195
 196         for (i = 0; i < n; i++)
 197                 kfree(a[i]);
 198         kfree(a);
 199 }
 200
 201 static void *array_zalloc(int n, size_t size, gfp_t flags)
 202 {
 203         void **a;
 204         int i;
 205
 206         a = kzalloc(n * sizeof(void*), flags);
 207         if (!a)
 208                 return NULL;
 209         for (i = 0; i < n; i++) {
 210                 a[i] = kzalloc(size, flags);
 211                 if (!a[i]) {
 212                         array_free(a, n);
 213                         return NULL;
 214                 }
 215         }
 216         return a;
 217 }
 218
 219 /*      core_create_device_list_for_node():
 220  *
 221  *
 222  */
 223 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 224 {
 225         struct se_dev_entry *deve;
 226         int i;
 227
 228         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 229                         sizeof(struct se_dev_entry), GFP_KERNEL);
 230         if (!nacl->device_list) {
 231                 pr_err("Unable to allocate memory for"
 232                         " struct se_node_acl->device_list\n");
 233                 return -ENOMEM;
 234         }
 235         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 236                 deve = nacl->device_list[i];
 237
 238                 atomic_set(&deve->ua_count, 0);
 239                 atomic_set(&deve->pr_ref_count, 0);
 240                 spin_lock_init(&deve->ua_lock);
 241                 INIT_LIST_HEAD(&deve->alua_port_list);
 242                 INIT_LIST_HEAD(&deve->ua_list);
 243         }
 244
 245         return 0;
 246 }
 247
 248 /*      core_tpg_check_initiator_node_acl()
 249  *
 250  *
 251  */
 252 struct se_node_acl *core_tpg_check_initiator_node_acl(
 253         struct se_portal_group *tpg,
 254         unsigned char *initiatorname)
 255 {
 256         struct se_node_acl *acl;
 257
 258         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 259         if (acl)
 260                 return acl;
 261
 262         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 263                 return NULL;
 264
 265         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 266         if (!acl)
 267                 return NULL;
 268
 269         INIT_LIST_HEAD(&acl->acl_list);
 270         INIT_LIST_HEAD(&acl->acl_sess_list);
 271         kref_init(&acl->acl_kref);
 272         init_completion(&acl->acl_free_comp);
 273         spin_lock_init(&acl->device_list_lock);
 274         spin_lock_init(&acl->nacl_sess_lock);
 275         atomic_set(&acl->acl_pr_ref_count, 0);
 276         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 277         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 278         acl->se_tpg = tpg;
 279         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 280         spin_lock_init(&acl->stats_lock);
 281         acl->dynamic_node_acl = 1;
 282
 283         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 284
 285         if (core_create_device_list_for_node(acl) < 0) {
 286                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 287                 return NULL;
 288         }
 289
 290         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 291                 core_free_device_list_for_node(acl, tpg);
 292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                 return NULL;
 294         }
 295         /*
 296          * Here we only create demo-mode MappedLUNs from the active
 297          * TPG LUNs if the fabric is not explicitly asking for
 298          * tpg_check_demo_mode_login_only() == 1.
 299          */
 300         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 301             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 302                 core_tpg_add_node_to_devs(acl, tpg);
 303
 304         spin_lock_irq(&tpg->acl_node_lock);
 305         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 306         tpg->num_node_acls++;
 307         spin_unlock_irq(&tpg->acl_node_lock);
 308
 309         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 310                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 311                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 312                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 313
 314         return acl;
 315 }
 316 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 317
 318 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 319 {
 320         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 321                 cpu_relax();
 322 }
 323
 324 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 325 {
 326         int i;
 327         struct se_lun *lun;
 328
 329         spin_lock(&tpg->tpg_lun_lock);
 330         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 331                 lun = tpg->tpg_lun_list[i];
 332
 333                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 334                     (lun->lun_se_dev == NULL))
 335                         continue;
 336
 337                 spin_unlock(&tpg->tpg_lun_lock);
 338                 core_dev_del_lun(tpg, lun->unpacked_lun);
 339                 spin_lock(&tpg->tpg_lun_lock);
 340         }
 341         spin_unlock(&tpg->tpg_lun_lock);
 342 }
 343 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 344
 345 /*      core_tpg_add_initiator_node_acl():
 346  *
 347  *
 348  */
 349 struct se_node_acl *core_tpg_add_initiator_node_acl(
 350         struct se_portal_group *tpg,
 351         struct se_node_acl *se_nacl,
 352         const char *initiatorname,
 353         u32 queue_depth)
 354 {
 355         struct se_node_acl *acl = NULL;
 356
 357         spin_lock_irq(&tpg->acl_node_lock);
 358         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 359         if (acl) {
 360                 if (acl->dynamic_node_acl) {
 361                         acl->dynamic_node_acl = 0;
 362                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 363                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 364                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 365                         spin_unlock_irq(&tpg->acl_node_lock);
 366                         /*
 367                          * Release the locally allocated struct se_node_acl
 368                          * because * core_tpg_add_initiator_node_acl() returned
 369                          * a pointer to an existing demo mode node ACL.
 370                          */
 371                         if (se_nacl)
 372                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 373                                                         se_nacl);
 374                         goto done;
 375                 }
 376
 377                 pr_err("ACL entry for %s Initiator"
 378                         " Node %s already exists for TPG %u, ignoring"
 379                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 380                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 381                 spin_unlock_irq(&tpg->acl_node_lock);
 382                 return ERR_PTR(-EEXIST);
 383         }
 384         spin_unlock_irq(&tpg->acl_node_lock);
 385
 386         if (!se_nacl) {
 387                 pr_err("struct se_node_acl pointer is NULL\n");
 388                 return ERR_PTR(-EINVAL);
 389         }
 390         /*
 391          * For v4.x logic the se_node_acl_s is hanging off a fabric
 392          * dependent structure allocated via
 393          * struct target_core_fabric_ops->fabric_make_nodeacl()
 394          */
 395         acl = se_nacl;
 396
 397         INIT_LIST_HEAD(&acl->acl_list);
 398         INIT_LIST_HEAD(&acl->acl_sess_list);
 399         kref_init(&acl->acl_kref);
 400         init_completion(&acl->acl_free_comp);
 401         spin_lock_init(&acl->device_list_lock);
 402         spin_lock_init(&acl->nacl_sess_lock);
 403         atomic_set(&acl->acl_pr_ref_count, 0);
 404         acl->queue_depth = queue_depth;
 405         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 406         acl->se_tpg = tpg;
 407         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 408         spin_lock_init(&acl->stats_lock);
 409
 410         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 411
 412         if (core_create_device_list_for_node(acl) < 0) {
 413                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 414                 return ERR_PTR(-ENOMEM);
 415         }
 416
 417         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 418                 core_free_device_list_for_node(acl, tpg);
 419                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 420                 return ERR_PTR(-EINVAL);
 421         }
 422
 423         spin_lock_irq(&tpg->acl_node_lock);
 424         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 425         tpg->num_node_acls++;
 426         spin_unlock_irq(&tpg->acl_node_lock);
 427
 428 done:
 429         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 430                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 431                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 432                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 433
 434         return acl;
 435 }
 436 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 437
 438 /*      core_tpg_del_initiator_node_acl():
 439  *
 440  *
 441  */
 442 int core_tpg_del_initiator_node_acl(
 443         struct se_portal_group *tpg,
 444         struct se_node_acl *acl,
 445         int force)
 446 {
 447         LIST_HEAD(sess_list);
 448         struct se_session *sess, *sess_tmp;
 449         unsigned long flags;
 450         int rc;
 451
 452         spin_lock_irq(&tpg->acl_node_lock);
 453         if (acl->dynamic_node_acl) {
 454                 acl->dynamic_node_acl = 0;
 455         }
 456         list_del(&acl->acl_list);
 457         tpg->num_node_acls--;
 458         spin_unlock_irq(&tpg->acl_node_lock);
 459
 460         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 461         acl->acl_stop = 1;
 462
 463         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 464                                 sess_acl_list) {
 465                 if (sess->sess_tearing_down != 0)
 466                         continue;
 467
 468                 target_get_session(sess);
 469                 list_move(&sess->sess_acl_list, &sess_list);
 470         }
 471         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 472
 473         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 474                 list_del(&sess->sess_acl_list);
 475
 476                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 477                 target_put_session(sess);
 478                 if (!rc)
 479                         continue;
 480                 target_put_session(sess);
 481         }
 482         target_put_nacl(acl);
 483         /*
 484          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 485          * for active fabric session transport_deregister_session() callbacks.
 486          */
 487         wait_for_completion(&acl->acl_free_comp);
 488
 489         core_tpg_wait_for_nacl_pr_ref(acl);
 490         core_clear_initiator_node_from_tpg(acl, tpg);
 491         core_free_device_list_for_node(acl, tpg);
 492
 493         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 494                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 495                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 496                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 497
 498         return 0;
 499 }
 500 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 501
 502 /*      core_tpg_set_initiator_node_queue_depth():
 503  *
 504  *
 505  */
 506 int core_tpg_set_initiator_node_queue_depth(
 507         struct se_portal_group *tpg,
 508         unsigned char *initiatorname,
 509         u32 queue_depth,
 510         int force)
 511 {
 512         struct se_session *sess, *init_sess = NULL;
 513         struct se_node_acl *acl;
 514         unsigned long flags;
 515         int dynamic_acl = 0;
 516
 517         spin_lock_irq(&tpg->acl_node_lock);
 518         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 519         if (!acl) {
 520                 pr_err("Access Control List entry for %s Initiator"
 521                         " Node %s does not exists for TPG %hu, ignoring"
 522                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 523                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 524                 spin_unlock_irq(&tpg->acl_node_lock);
 525                 return -ENODEV;
 526         }
 527         if (acl->dynamic_node_acl) {
 528                 acl->dynamic_node_acl = 0;
 529                 dynamic_acl = 1;
 530         }
 531         spin_unlock_irq(&tpg->acl_node_lock);
 532
 533         spin_lock_irqsave(&tpg->session_lock, flags);
 534         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 535                 if (sess->se_node_acl != acl)
 536                         continue;
 537
 538                 if (!force) {
 539                         pr_err("Unable to change queue depth for %s"
 540                                 " Initiator Node: %s while session is"
 541                                 " operational.  To forcefully change the queue"
 542                                 " depth and force session reinstatement"
 543                                 " use the \"force=1\" parameter.\n",
 544                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 545                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 546
 547                         spin_lock_irq(&tpg->acl_node_lock);
 548                         if (dynamic_acl)
 549                                 acl->dynamic_node_acl = 1;
 550                         spin_unlock_irq(&tpg->acl_node_lock);
 551                         return -EEXIST;
 552                 }
 553                 /*
 554                  * Determine if the session needs to be closed by our context.
 555                  */
 556                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 557                         continue;
 558
 559                 init_sess = sess;
 560                 break;
 561         }
 562
 563         /*
 564          * User has requested to change the queue depth for a Initiator Node.
 565          * Change the value in the Node's struct se_node_acl, and call
 566          * core_set_queue_depth_for_node() to add the requested queue depth.
 567          *
 568          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 569          * reinstatement to occur if there is an active session for the
 570          * $FABRIC_MOD Initiator Node in question.
 571          */
 572         acl->queue_depth = queue_depth;
 573
 574         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 575                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 576                 /*
 577                  * Force session reinstatement if
 578                  * core_set_queue_depth_for_node() failed, because we assume
 579                  * the $FABRIC_MOD has already the set session reinstatement
 580                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 581                  */
 582                 if (init_sess)
 583                         tpg->se_tpg_tfo->close_session(init_sess);
 584
 585                 spin_lock_irq(&tpg->acl_node_lock);
 586                 if (dynamic_acl)
 587                         acl->dynamic_node_acl = 1;
 588                 spin_unlock_irq(&tpg->acl_node_lock);
 589                 return -EINVAL;
 590         }
 591         spin_unlock_irqrestore(&tpg->session_lock, flags);
 592         /*
 593          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 594          * forcefully shutdown the $FABRIC_MOD session/nexus.
 595          */
 596         if (init_sess)
 597                 tpg->se_tpg_tfo->close_session(init_sess);
 598
 599         pr_debug("Successfully changed queue depth to: %d for Initiator"
 600                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 601                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 602                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 603
 604         spin_lock_irq(&tpg->acl_node_lock);
 605         if (dynamic_acl)
 606                 acl->dynamic_node_acl = 1;
 607         spin_unlock_irq(&tpg->acl_node_lock);
 608
 609         return 0;
 610 }
 611 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 612
 613 /*      core_tpg_set_initiator_node_tag():
 614  *
 615  *      Initiator nodeacl tags are not used internally, but may be used by
 616  *      userspace to emulate aliases or groups.
 617  *      Returns length of newly-set tag or -EINVAL.
 618  */
 619 int core_tpg_set_initiator_node_tag(
 620         struct se_portal_group *tpg,
 621         struct se_node_acl *acl,
 622         const char *new_tag)
 623 {
 624         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 625                 return -EINVAL;
 626
 627         if (!strncmp("NULL", new_tag, 4)) {
 628                 acl->acl_tag[0] = '\0';
 629                 return 0;
 630         }
 631
 632         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 633 }
 634 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 635
 636 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 637 {
 638         /* Set in core_dev_setup_virtual_lun0() */
 639         struct se_device *dev = g_lun0_dev;
 640         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 641         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 642         int ret;
 643
 644         lun->unpacked_lun = 0;
 645         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 646         atomic_set(&lun->lun_acl_count, 0);
 647         init_completion(&lun->lun_shutdown_comp);
 648         INIT_LIST_HEAD(&lun->lun_acl_list);
 649         INIT_LIST_HEAD(&lun->lun_cmd_list);
 650         spin_lock_init(&lun->lun_acl_lock);
 651         spin_lock_init(&lun->lun_cmd_lock);
 652         spin_lock_init(&lun->lun_sep_lock);
 653
 654         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 655         if (ret < 0)
 656                 return ret;
 657
 658         return 0;
 659 }
 660
 661 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 662 {
 663         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 664
 665         core_tpg_post_dellun(se_tpg, lun);
 666 }
 667
 668 int core_tpg_register(
 669         struct target_core_fabric_ops *tfo,
 670         struct se_wwn *se_wwn,
 671         struct se_portal_group *se_tpg,
 672         void *tpg_fabric_ptr,
 673         int se_tpg_type)
 674 {
 675         struct se_lun *lun;
 676         u32 i;
 677
 678         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 679                         sizeof(struct se_lun), GFP_KERNEL);
 680         if (!se_tpg->tpg_lun_list) {
 681                 pr_err("Unable to allocate struct se_portal_group->"
 682                                 "tpg_lun_list\n");
 683                 return -ENOMEM;
 684         }
 685
 686         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 687                 lun = se_tpg->tpg_lun_list[i];
 688                 lun->unpacked_lun = i;
 689                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 690                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 691                 atomic_set(&lun->lun_acl_count, 0);
 692                 init_completion(&lun->lun_shutdown_comp);
 693                 INIT_LIST_HEAD(&lun->lun_acl_list);
 694                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 695                 spin_lock_init(&lun->lun_acl_lock);
 696                 spin_lock_init(&lun->lun_cmd_lock);
 697                 spin_lock_init(&lun->lun_sep_lock);
 698         }
 699
 700         se_tpg->se_tpg_type = se_tpg_type;
 701         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 702         se_tpg->se_tpg_tfo = tfo;
 703         se_tpg->se_tpg_wwn = se_wwn;
 704         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 705         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 706         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 707         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 708         spin_lock_init(&se_tpg->acl_node_lock);
 709         spin_lock_init(&se_tpg->session_lock);
 710         spin_lock_init(&se_tpg->tpg_lun_lock);
 711
 712         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 713                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 714                         array_free(se_tpg->tpg_lun_list,
 715                                    TRANSPORT_MAX_LUNS_PER_TPG);
 716                         return -ENOMEM;
 717                 }
 718         }
 719
 720         spin_lock_bh(&tpg_lock);
 721         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 722         spin_unlock_bh(&tpg_lock);
 723
 724         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 725                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 726                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 727                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 728                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 729
 730         return 0;
 731 }
 732 EXPORT_SYMBOL(core_tpg_register);
 733
 734 int core_tpg_deregister(struct se_portal_group *se_tpg)
 735 {
 736         struct se_node_acl *nacl, *nacl_tmp;
 737
 738         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 739                 " for endpoint: %s Portal Tag %u\n",
 740                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 741                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 742                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 743                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 744
 745         spin_lock_bh(&tpg_lock);
 746         list_del(&se_tpg->se_tpg_node);
 747         spin_unlock_bh(&tpg_lock);
 748
 749         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 750                 cpu_relax();
 751         /*
 752          * Release any remaining demo-mode generated se_node_acl that have
 753          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 754          * in transport_deregister_session().
 755          */
 756         spin_lock_irq(&se_tpg->acl_node_lock);
 757         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 758                         acl_list) {
 759                 list_del(&nacl->acl_list);
 760                 se_tpg->num_node_acls--;
 761                 spin_unlock_irq(&se_tpg->acl_node_lock);
 762
 763                 core_tpg_wait_for_nacl_pr_ref(nacl);
 764                 core_free_device_list_for_node(nacl, se_tpg);
 765                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 766
 767                 spin_lock_irq(&se_tpg->acl_node_lock);
 768         }
 769         spin_unlock_irq(&se_tpg->acl_node_lock);
 770
 771         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 772                 core_tpg_release_virtual_lun0(se_tpg);
 773
 774         se_tpg->se_tpg_fabric_ptr = NULL;
 775         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 776         return 0;
 777 }
 778 EXPORT_SYMBOL(core_tpg_deregister);
 779
 780 struct se_lun *core_tpg_pre_addlun(
 781         struct se_portal_group *tpg,
 782         u32 unpacked_lun)
 783 {
 784         struct se_lun *lun;
 785
 786         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 787                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 788                         "-1: %u for Target Portal Group: %u\n",
 789                         tpg->se_tpg_tfo->get_fabric_name(),
 790                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 791                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 792                 return ERR_PTR(-EOVERFLOW);
 793         }
 794
 795         spin_lock(&tpg->tpg_lun_lock);
 796         lun = tpg->tpg_lun_list[unpacked_lun];
 797         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 798                 pr_err("TPG Logical Unit Number: %u is already active"
 799                         " on %s Target Portal Group: %u, ignoring request.\n",
 800                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 801                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 802                 spin_unlock(&tpg->tpg_lun_lock);
 803                 return ERR_PTR(-EINVAL);
 804         }
 805         spin_unlock(&tpg->tpg_lun_lock);
 806
 807         return lun;
 808 }
 809
 810 int core_tpg_post_addlun(
 811         struct se_portal_group *tpg,
 812         struct se_lun *lun,
 813         u32 lun_access,
 814         void *lun_ptr)
 815 {
 816         int ret;
 817
 818         ret = core_dev_export(lun_ptr, tpg, lun);
 819         if (ret < 0)
 820                 return ret;
 821
 822         spin_lock(&tpg->tpg_lun_lock);
 823         lun->lun_access = lun_access;
 824         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 825         spin_unlock(&tpg->tpg_lun_lock);
 826
 827         return 0;
 828 }
 829
 830 static void core_tpg_shutdown_lun(
 831         struct se_portal_group *tpg,
 832         struct se_lun *lun)
 833 {
 834         core_clear_lun_from_tpg(lun, tpg);
 835         transport_clear_lun_from_sessions(lun);
 836 }
 837
 838 struct se_lun *core_tpg_pre_dellun(
 839         struct se_portal_group *tpg,
 840         u32 unpacked_lun)
 841 {
 842         struct se_lun *lun;
 843
 844         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 845                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 846                         "-1: %u for Target Portal Group: %u\n",
 847                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 848                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 849                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 850                 return ERR_PTR(-EOVERFLOW);
 851         }
 852
 853         spin_lock(&tpg->tpg_lun_lock);
 854         lun = tpg->tpg_lun_list[unpacked_lun];
 855         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 856                 pr_err("%s Logical Unit Number: %u is not active on"
 857                         " Target Portal Group: %u, ignoring request.\n",
 858                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 859                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 860                 spin_unlock(&tpg->tpg_lun_lock);
 861                 return ERR_PTR(-ENODEV);
 862         }
 863         spin_unlock(&tpg->tpg_lun_lock);
 864
 865         return lun;
 866 }
 867
 868 int core_tpg_post_dellun(
 869         struct se_portal_group *tpg,
 870         struct se_lun *lun)
 871 {
 872         core_tpg_shutdown_lun(tpg, lun);
 873
 874         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 875
 876         spin_lock(&tpg->tpg_lun_lock);
 877         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 878         spin_unlock(&tpg->tpg_lun_lock);
 879
 880         return 0;
 881 }