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         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 115                 if (!strcmp(acl->initiatorname, initiatorname) &&
 116                     !acl->dynamic_node_acl) {
 117                         spin_unlock_irq(&tpg->acl_node_lock);
 118                         return acl;
 119                 }
 120         }
 121         spin_unlock_irq(&tpg->acl_node_lock);
 122
 123         return NULL;
 124 }
 125
 126 /*      core_tpg_add_node_to_devs():
 127  *
 128  *
 129  */
 130 void core_tpg_add_node_to_devs(
 131         struct se_node_acl *acl,
 132         struct se_portal_group *tpg)
 133 {
 134         int i = 0;
 135         u32 lun_access = 0;
 136         struct se_lun *lun;
 137         struct se_device *dev;
 138
 139         spin_lock(&tpg->tpg_lun_lock);
 140         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 141                 lun = tpg->tpg_lun_list[i];
 142                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 143                         continue;
 144
 145                 spin_unlock(&tpg->tpg_lun_lock);
 146
 147                 dev = lun->lun_se_dev;
 148                 /*
 149                  * By default in LIO-Target $FABRIC_MOD,
 150                  * demo_mode_write_protect is ON, or READ_ONLY;
 151                  */
 152                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 153                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 154                 } else {
 155                         /*
 156                          * Allow only optical drives to issue R/W in default RO
 157                          * demo mode.
 158                          */
 159                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 160                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 161                         else
 162                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 163                 }
 164
 165                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 166                         " access for LUN in Demo Mode\n",
 167                         tpg->se_tpg_tfo->get_fabric_name(),
 168                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 169                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 170                         "READ-WRITE" : "READ-ONLY");
 171
 172                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 173                                 lun_access, acl, tpg);
 174                 spin_lock(&tpg->tpg_lun_lock);
 175         }
 176         spin_unlock(&tpg->tpg_lun_lock);
 177 }
 178
 179 /*      core_set_queue_depth_for_node():
 180  *
 181  *
 182  */
 183 static int core_set_queue_depth_for_node(
 184         struct se_portal_group *tpg,
 185         struct se_node_acl *acl)
 186 {
 187         if (!acl->queue_depth) {
 188                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 189                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 190                         acl->initiatorname);
 191                 acl->queue_depth = 1;
 192         }
 193
 194         return 0;
 195 }
 196
 197 void array_free(void *array, int n)
 198 {
 199         void **a = array;
 200         int i;
 201
 202         for (i = 0; i < n; i++)
 203                 kfree(a[i]);
 204         kfree(a);
 205 }
 206
 207 static void *array_zalloc(int n, size_t size, gfp_t flags)
 208 {
 209         void **a;
 210         int i;
 211
 212         a = kzalloc(n * sizeof(void*), flags);
 213         if (!a)
 214                 return NULL;
 215         for (i = 0; i < n; i++) {
 216                 a[i] = kzalloc(size, flags);
 217                 if (!a[i]) {
 218                         array_free(a, n);
 219                         return NULL;
 220                 }
 221         }
 222         return a;
 223 }
 224
 225 /*      core_create_device_list_for_node():
 226  *
 227  *
 228  */
 229 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 230 {
 231         struct se_dev_entry *deve;
 232         int i;
 233
 234         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 235                         sizeof(struct se_dev_entry), GFP_KERNEL);
 236         if (!nacl->device_list) {
 237                 pr_err("Unable to allocate memory for"
 238                         " struct se_node_acl->device_list\n");
 239                 return -ENOMEM;
 240         }
 241         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 242                 deve = nacl->device_list[i];
 243
 244                 atomic_set(&deve->ua_count, 0);
 245                 atomic_set(&deve->pr_ref_count, 0);
 246                 spin_lock_init(&deve->ua_lock);
 247                 INIT_LIST_HEAD(&deve->alua_port_list);
 248                 INIT_LIST_HEAD(&deve->ua_list);
 249         }
 250
 251         return 0;
 252 }
 253
 254 /*      core_tpg_check_initiator_node_acl()
 255  *
 256  *
 257  */
 258 struct se_node_acl *core_tpg_check_initiator_node_acl(
 259         struct se_portal_group *tpg,
 260         unsigned char *initiatorname)
 261 {
 262         struct se_node_acl *acl;
 263
 264         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 265         if (acl)
 266                 return acl;
 267
 268         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 269                 return NULL;
 270
 271         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 272         if (!acl)
 273                 return NULL;
 274
 275         INIT_LIST_HEAD(&acl->acl_list);
 276         INIT_LIST_HEAD(&acl->acl_sess_list);
 277         kref_init(&acl->acl_kref);
 278         init_completion(&acl->acl_free_comp);
 279         spin_lock_init(&acl->device_list_lock);
 280         spin_lock_init(&acl->nacl_sess_lock);
 281         atomic_set(&acl->acl_pr_ref_count, 0);
 282         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 283         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 284         acl->se_tpg = tpg;
 285         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 286         spin_lock_init(&acl->stats_lock);
 287         acl->dynamic_node_acl = 1;
 288
 289         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 290
 291         if (core_create_device_list_for_node(acl) < 0) {
 292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                 return NULL;
 294         }
 295
 296         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 297                 core_free_device_list_for_node(acl, tpg);
 298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 299                 return NULL;
 300         }
 301         /*
 302          * Here we only create demo-mode MappedLUNs from the active
 303          * TPG LUNs if the fabric is not explicitly asking for
 304          * tpg_check_demo_mode_login_only() == 1.
 305          */
 306         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 307             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 308                 core_tpg_add_node_to_devs(acl, tpg);
 309
 310         spin_lock_irq(&tpg->acl_node_lock);
 311         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 312         tpg->num_node_acls++;
 313         spin_unlock_irq(&tpg->acl_node_lock);
 314
 315         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 316                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 317                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 318                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 319
 320         return acl;
 321 }
 322 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 323
 324 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 325 {
 326         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 327                 cpu_relax();
 328 }
 329
 330 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 331 {
 332         int i;
 333         struct se_lun *lun;
 334
 335         spin_lock(&tpg->tpg_lun_lock);
 336         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 337                 lun = tpg->tpg_lun_list[i];
 338
 339                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 340                     (lun->lun_se_dev == NULL))
 341                         continue;
 342
 343                 spin_unlock(&tpg->tpg_lun_lock);
 344                 core_dev_del_lun(tpg, lun->unpacked_lun);
 345                 spin_lock(&tpg->tpg_lun_lock);
 346         }
 347         spin_unlock(&tpg->tpg_lun_lock);
 348 }
 349 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 350
 351 /*      core_tpg_add_initiator_node_acl():
 352  *
 353  *
 354  */
 355 struct se_node_acl *core_tpg_add_initiator_node_acl(
 356         struct se_portal_group *tpg,
 357         struct se_node_acl *se_nacl,
 358         const char *initiatorname,
 359         u32 queue_depth)
 360 {
 361         struct se_node_acl *acl = NULL;
 362
 363         spin_lock_irq(&tpg->acl_node_lock);
 364         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 365         if (acl) {
 366                 if (acl->dynamic_node_acl) {
 367                         acl->dynamic_node_acl = 0;
 368                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 369                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 370                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 371                         spin_unlock_irq(&tpg->acl_node_lock);
 372                         /*
 373                          * Release the locally allocated struct se_node_acl
 374                          * because * core_tpg_add_initiator_node_acl() returned
 375                          * a pointer to an existing demo mode node ACL.
 376                          */
 377                         if (se_nacl)
 378                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 379                                                         se_nacl);
 380                         goto done;
 381                 }
 382
 383                 pr_err("ACL entry for %s Initiator"
 384                         " Node %s already exists for TPG %u, ignoring"
 385                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 386                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 387                 spin_unlock_irq(&tpg->acl_node_lock);
 388                 return ERR_PTR(-EEXIST);
 389         }
 390         spin_unlock_irq(&tpg->acl_node_lock);
 391
 392         if (!se_nacl) {
 393                 pr_err("struct se_node_acl pointer is NULL\n");
 394                 return ERR_PTR(-EINVAL);
 395         }
 396         /*
 397          * For v4.x logic the se_node_acl_s is hanging off a fabric
 398          * dependent structure allocated via
 399          * struct target_core_fabric_ops->fabric_make_nodeacl()
 400          */
 401         acl = se_nacl;
 402
 403         INIT_LIST_HEAD(&acl->acl_list);
 404         INIT_LIST_HEAD(&acl->acl_sess_list);
 405         kref_init(&acl->acl_kref);
 406         init_completion(&acl->acl_free_comp);
 407         spin_lock_init(&acl->device_list_lock);
 408         spin_lock_init(&acl->nacl_sess_lock);
 409         atomic_set(&acl->acl_pr_ref_count, 0);
 410         acl->queue_depth = queue_depth;
 411         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 412         acl->se_tpg = tpg;
 413         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 414         spin_lock_init(&acl->stats_lock);
 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 int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 643 {
 644         /* Set in core_dev_setup_virtual_lun0() */
 645         struct se_device *dev = g_lun0_dev;
 646         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 647         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 648         int ret;
 649
 650         lun->unpacked_lun = 0;
 651         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 652         atomic_set(&lun->lun_acl_count, 0);
 653         init_completion(&lun->lun_shutdown_comp);
 654         INIT_LIST_HEAD(&lun->lun_acl_list);
 655         INIT_LIST_HEAD(&lun->lun_cmd_list);
 656         spin_lock_init(&lun->lun_acl_lock);
 657         spin_lock_init(&lun->lun_cmd_lock);
 658         spin_lock_init(&lun->lun_sep_lock);
 659
 660         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 661         if (ret < 0)
 662                 return ret;
 663
 664         return 0;
 665 }
 666
 667 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 668 {
 669         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 670
 671         core_tpg_post_dellun(se_tpg, lun);
 672 }
 673
 674 int core_tpg_register(
 675         struct target_core_fabric_ops *tfo,
 676         struct se_wwn *se_wwn,
 677         struct se_portal_group *se_tpg,
 678         void *tpg_fabric_ptr,
 679         int se_tpg_type)
 680 {
 681         struct se_lun *lun;
 682         u32 i;
 683
 684         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 685                         sizeof(struct se_lun), GFP_KERNEL);
 686         if (!se_tpg->tpg_lun_list) {
 687                 pr_err("Unable to allocate struct se_portal_group->"
 688                                 "tpg_lun_list\n");
 689                 return -ENOMEM;
 690         }
 691
 692         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 693                 lun = se_tpg->tpg_lun_list[i];
 694                 lun->unpacked_lun = i;
 695                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 696                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 697                 atomic_set(&lun->lun_acl_count, 0);
 698                 init_completion(&lun->lun_shutdown_comp);
 699                 INIT_LIST_HEAD(&lun->lun_acl_list);
 700                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 701                 spin_lock_init(&lun->lun_acl_lock);
 702                 spin_lock_init(&lun->lun_cmd_lock);
 703                 spin_lock_init(&lun->lun_sep_lock);
 704         }
 705
 706         se_tpg->se_tpg_type = se_tpg_type;
 707         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 708         se_tpg->se_tpg_tfo = tfo;
 709         se_tpg->se_tpg_wwn = se_wwn;
 710         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 711         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 712         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 713         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 714         spin_lock_init(&se_tpg->acl_node_lock);
 715         spin_lock_init(&se_tpg->session_lock);
 716         spin_lock_init(&se_tpg->tpg_lun_lock);
 717
 718         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 719                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 720                         kfree(se_tpg);
 721                         return -ENOMEM;
 722                 }
 723         }
 724
 725         spin_lock_bh(&tpg_lock);
 726         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 727         spin_unlock_bh(&tpg_lock);
 728
 729         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 730                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 731                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 732                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 733                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 734
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(core_tpg_register);
 738
 739 int core_tpg_deregister(struct se_portal_group *se_tpg)
 740 {
 741         struct se_node_acl *nacl, *nacl_tmp;
 742
 743         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 744                 " for endpoint: %s Portal Tag %u\n",
 745                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 746                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 747                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 748                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 749
 750         spin_lock_bh(&tpg_lock);
 751         list_del(&se_tpg->se_tpg_node);
 752         spin_unlock_bh(&tpg_lock);
 753
 754         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 755                 cpu_relax();
 756         /*
 757          * Release any remaining demo-mode generated se_node_acl that have
 758          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 759          * in transport_deregister_session().
 760          */
 761         spin_lock_irq(&se_tpg->acl_node_lock);
 762         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 763                         acl_list) {
 764                 list_del(&nacl->acl_list);
 765                 se_tpg->num_node_acls--;
 766                 spin_unlock_irq(&se_tpg->acl_node_lock);
 767
 768                 core_tpg_wait_for_nacl_pr_ref(nacl);
 769                 core_free_device_list_for_node(nacl, se_tpg);
 770                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 771
 772                 spin_lock_irq(&se_tpg->acl_node_lock);
 773         }
 774         spin_unlock_irq(&se_tpg->acl_node_lock);
 775
 776         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 777                 core_tpg_release_virtual_lun0(se_tpg);
 778
 779         se_tpg->se_tpg_fabric_ptr = NULL;
 780         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 781         return 0;
 782 }
 783 EXPORT_SYMBOL(core_tpg_deregister);
 784
 785 struct se_lun *core_tpg_pre_addlun(
 786         struct se_portal_group *tpg,
 787         u32 unpacked_lun)
 788 {
 789         struct se_lun *lun;
 790
 791         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 792                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 793                         "-1: %u for Target Portal Group: %u\n",
 794                         tpg->se_tpg_tfo->get_fabric_name(),
 795                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 796                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 797                 return ERR_PTR(-EOVERFLOW);
 798         }
 799
 800         spin_lock(&tpg->tpg_lun_lock);
 801         lun = tpg->tpg_lun_list[unpacked_lun];
 802         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 803                 pr_err("TPG Logical Unit Number: %u is already active"
 804                         " on %s Target Portal Group: %u, ignoring request.\n",
 805                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 806                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 807                 spin_unlock(&tpg->tpg_lun_lock);
 808                 return ERR_PTR(-EINVAL);
 809         }
 810         spin_unlock(&tpg->tpg_lun_lock);
 811
 812         return lun;
 813 }
 814
 815 int core_tpg_post_addlun(
 816         struct se_portal_group *tpg,
 817         struct se_lun *lun,
 818         u32 lun_access,
 819         void *lun_ptr)
 820 {
 821         int ret;
 822
 823         ret = core_dev_export(lun_ptr, tpg, lun);
 824         if (ret < 0)
 825                 return ret;
 826
 827         spin_lock(&tpg->tpg_lun_lock);
 828         lun->lun_access = lun_access;
 829         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 830         spin_unlock(&tpg->tpg_lun_lock);
 831
 832         return 0;
 833 }
 834
 835 static void core_tpg_shutdown_lun(
 836         struct se_portal_group *tpg,
 837         struct se_lun *lun)
 838 {
 839         core_clear_lun_from_tpg(lun, tpg);
 840         transport_clear_lun_from_sessions(lun);
 841 }
 842
 843 struct se_lun *core_tpg_pre_dellun(
 844         struct se_portal_group *tpg,
 845         u32 unpacked_lun)
 846 {
 847         struct se_lun *lun;
 848
 849         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 850                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 851                         "-1: %u for Target Portal Group: %u\n",
 852                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 853                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 854                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 855                 return ERR_PTR(-EOVERFLOW);
 856         }
 857
 858         spin_lock(&tpg->tpg_lun_lock);
 859         lun = tpg->tpg_lun_list[unpacked_lun];
 860         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 861                 pr_err("%s Logical Unit Number: %u is not active on"
 862                         " Target Portal Group: %u, ignoring request.\n",
 863                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 864                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 865                 spin_unlock(&tpg->tpg_lun_lock);
 866                 return ERR_PTR(-ENODEV);
 867         }
 868         spin_unlock(&tpg->tpg_lun_lock);
 869
 870         return lun;
 871 }
 872
 873 int core_tpg_post_dellun(
 874         struct se_portal_group *tpg,
 875         struct se_lun *lun)
 876 {
 877         core_tpg_shutdown_lun(tpg, lun);
 878
 879         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 880
 881         spin_lock(&tpg->tpg_lun_lock);
 882         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 883         spin_unlock(&tpg->tpg_lun_lock);
 884
 885         return 0;
 886 }