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  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/string.h>
  31 #include <linux/timer.h>
  32 #include <linux/slab.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <net/sock.h>
  37 #include <net/tcp.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_backend.h>
  43 #include <target/target_core_fabric.h>
  44
  45 #include "target_core_internal.h"
  46
  47 extern struct se_device *g_lun0_dev;
  48
  49 static DEFINE_SPINLOCK(tpg_lock);
  50 static LIST_HEAD(tpg_list);
  51
  52 /*      core_clear_initiator_node_from_tpg():
  53  *
  54  *
  55  */
  56 static void core_clear_initiator_node_from_tpg(
  57         struct se_node_acl *nacl,
  58         struct se_portal_group *tpg)
  59 {
  60         int i;
  61         struct se_dev_entry *deve;
  62         struct se_lun *lun;
  63         struct se_lun_acl *acl, *acl_tmp;
  64
  65         spin_lock_irq(&nacl->device_list_lock);
  66         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  67                 deve = nacl->device_list[i];
  68
  69                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  70                         continue;
  71
  72                 if (!deve->se_lun) {
  73                         pr_err("%s device entries device pointer is"
  74                                 " NULL, but Initiator has access.\n",
  75                                 tpg->se_tpg_tfo->get_fabric_name());
  76                         continue;
  77                 }
  78
  79                 lun = deve->se_lun;
  80                 spin_unlock_irq(&nacl->device_list_lock);
  81                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  82                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  83
  84                 spin_lock(&lun->lun_acl_lock);
  85                 list_for_each_entry_safe(acl, acl_tmp,
  86                                         &lun->lun_acl_list, lacl_list) {
  87                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
  88                             (acl->mapped_lun == deve->mapped_lun))
  89                                 break;
  90                 }
  91
  92                 if (!acl) {
  93                         pr_err("Unable to locate struct se_lun_acl for %s,"
  94                                 " mapped_lun: %u\n", nacl->initiatorname,
  95                                 deve->mapped_lun);
  96                         spin_unlock(&lun->lun_acl_lock);
  97                         spin_lock_irq(&nacl->device_list_lock);
  98                         continue;
  99                 }
 100
 101                 list_del(&acl->lacl_list);
 102                 spin_unlock(&lun->lun_acl_lock);
 103
 104                 spin_lock_irq(&nacl->device_list_lock);
 105                 kfree(acl);
 106         }
 107         spin_unlock_irq(&nacl->device_list_lock);
 108 }
 109
 110 /*      __core_tpg_get_initiator_node_acl():
 111  *
 112  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 113  */
 114 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 115         struct se_portal_group *tpg,
 116         const char *initiatorname)
 117 {
 118         struct se_node_acl *acl;
 119
 120         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 121                 if (!strcmp(acl->initiatorname, initiatorname))
 122                         return acl;
 123         }
 124
 125         return NULL;
 126 }
 127
 128 /*      core_tpg_get_initiator_node_acl():
 129  *
 130  *
 131  */
 132 struct se_node_acl *core_tpg_get_initiator_node_acl(
 133         struct se_portal_group *tpg,
 134         unsigned char *initiatorname)
 135 {
 136         struct se_node_acl *acl;
 137
 138         spin_lock_irq(&tpg->acl_node_lock);
 139         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 140                 if (!strcmp(acl->initiatorname, initiatorname) &&
 141                     !acl->dynamic_node_acl) {
 142                         spin_unlock_irq(&tpg->acl_node_lock);
 143                         return acl;
 144                 }
 145         }
 146         spin_unlock_irq(&tpg->acl_node_lock);
 147
 148         return NULL;
 149 }
 150
 151 /*      core_tpg_add_node_to_devs():
 152  *
 153  *
 154  */
 155 void core_tpg_add_node_to_devs(
 156         struct se_node_acl *acl,
 157         struct se_portal_group *tpg)
 158 {
 159         int i = 0;
 160         u32 lun_access = 0;
 161         struct se_lun *lun;
 162         struct se_device *dev;
 163
 164         spin_lock(&tpg->tpg_lun_lock);
 165         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 166                 lun = tpg->tpg_lun_list[i];
 167                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 168                         continue;
 169
 170                 spin_unlock(&tpg->tpg_lun_lock);
 171
 172                 dev = lun->lun_se_dev;
 173                 /*
 174                  * By default in LIO-Target $FABRIC_MOD,
 175                  * demo_mode_write_protect is ON, or READ_ONLY;
 176                  */
 177                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 178                         if (dev->dev_flags & DF_READ_ONLY)
 179                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 180                         else
 181                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 182                 } else {
 183                         /*
 184                          * Allow only optical drives to issue R/W in default RO
 185                          * demo mode.
 186                          */
 187                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 188                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 189                         else
 190                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 191                 }
 192
 193                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 194                         " access for LUN in Demo Mode\n",
 195                         tpg->se_tpg_tfo->get_fabric_name(),
 196                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 197                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 198                         "READ-WRITE" : "READ-ONLY");
 199
 200                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 201                                 lun_access, acl, tpg, 1);
 202                 spin_lock(&tpg->tpg_lun_lock);
 203         }
 204         spin_unlock(&tpg->tpg_lun_lock);
 205 }
 206
 207 /*      core_set_queue_depth_for_node():
 208  *
 209  *
 210  */
 211 static int core_set_queue_depth_for_node(
 212         struct se_portal_group *tpg,
 213         struct se_node_acl *acl)
 214 {
 215         if (!acl->queue_depth) {
 216                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 217                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 218                         acl->initiatorname);
 219                 acl->queue_depth = 1;
 220         }
 221
 222         return 0;
 223 }
 224
 225 void array_free(void *array, int n)
 226 {
 227         void **a = array;
 228         int i;
 229
 230         for (i = 0; i < n; i++)
 231                 kfree(a[i]);
 232         kfree(a);
 233 }
 234
 235 static void *array_zalloc(int n, size_t size, gfp_t flags)
 236 {
 237         void **a;
 238         int i;
 239
 240         a = kzalloc(n * sizeof(void*), flags);
 241         if (!a)
 242                 return NULL;
 243         for (i = 0; i < n; i++) {
 244                 a[i] = kzalloc(size, flags);
 245                 if (!a[i]) {
 246                         array_free(a, n);
 247                         return NULL;
 248                 }
 249         }
 250         return a;
 251 }
 252
 253 /*      core_create_device_list_for_node():
 254  *
 255  *
 256  */
 257 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 258 {
 259         struct se_dev_entry *deve;
 260         int i;
 261
 262         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 263                         sizeof(struct se_dev_entry), GFP_KERNEL);
 264         if (!nacl->device_list) {
 265                 pr_err("Unable to allocate memory for"
 266                         " struct se_node_acl->device_list\n");
 267                 return -ENOMEM;
 268         }
 269         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 270                 deve = nacl->device_list[i];
 271
 272                 atomic_set(&deve->ua_count, 0);
 273                 atomic_set(&deve->pr_ref_count, 0);
 274                 spin_lock_init(&deve->ua_lock);
 275                 INIT_LIST_HEAD(&deve->alua_port_list);
 276                 INIT_LIST_HEAD(&deve->ua_list);
 277         }
 278
 279         return 0;
 280 }
 281
 282 /*      core_tpg_check_initiator_node_acl()
 283  *
 284  *
 285  */
 286 struct se_node_acl *core_tpg_check_initiator_node_acl(
 287         struct se_portal_group *tpg,
 288         unsigned char *initiatorname)
 289 {
 290         struct se_node_acl *acl;
 291
 292         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 293         if (acl)
 294                 return acl;
 295
 296         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 297                 return NULL;
 298
 299         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 300         if (!acl)
 301                 return NULL;
 302
 303         INIT_LIST_HEAD(&acl->acl_list);
 304         INIT_LIST_HEAD(&acl->acl_sess_list);
 305         kref_init(&acl->acl_kref);
 306         init_completion(&acl->acl_free_comp);
 307         spin_lock_init(&acl->device_list_lock);
 308         spin_lock_init(&acl->nacl_sess_lock);
 309         atomic_set(&acl->acl_pr_ref_count, 0);
 310         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 311         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 312         acl->se_tpg = tpg;
 313         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 314         spin_lock_init(&acl->stats_lock);
 315         acl->dynamic_node_acl = 1;
 316
 317         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 318
 319         if (core_create_device_list_for_node(acl) < 0) {
 320                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 321                 return NULL;
 322         }
 323
 324         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 325                 core_free_device_list_for_node(acl, tpg);
 326                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 327                 return NULL;
 328         }
 329         /*
 330          * Here we only create demo-mode MappedLUNs from the active
 331          * TPG LUNs if the fabric is not explictly asking for
 332          * tpg_check_demo_mode_login_only() == 1.
 333          */
 334         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 335             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 336                 do { ; } while (0);
 337         else
 338                 core_tpg_add_node_to_devs(acl, tpg);
 339
 340         spin_lock_irq(&tpg->acl_node_lock);
 341         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 342         tpg->num_node_acls++;
 343         spin_unlock_irq(&tpg->acl_node_lock);
 344
 345         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 346                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 347                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 348                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 349
 350         return acl;
 351 }
 352 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 353
 354 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 355 {
 356         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 357                 cpu_relax();
 358 }
 359
 360 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 361 {
 362         int i;
 363         struct se_lun *lun;
 364
 365         spin_lock(&tpg->tpg_lun_lock);
 366         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 367                 lun = tpg->tpg_lun_list[i];
 368
 369                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 370                     (lun->lun_se_dev == NULL))
 371                         continue;
 372
 373                 spin_unlock(&tpg->tpg_lun_lock);
 374                 core_dev_del_lun(tpg, lun->unpacked_lun);
 375                 spin_lock(&tpg->tpg_lun_lock);
 376         }
 377         spin_unlock(&tpg->tpg_lun_lock);
 378 }
 379 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 380
 381 /*      core_tpg_add_initiator_node_acl():
 382  *
 383  *
 384  */
 385 struct se_node_acl *core_tpg_add_initiator_node_acl(
 386         struct se_portal_group *tpg,
 387         struct se_node_acl *se_nacl,
 388         const char *initiatorname,
 389         u32 queue_depth)
 390 {
 391         struct se_node_acl *acl = NULL;
 392
 393         spin_lock_irq(&tpg->acl_node_lock);
 394         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 395         if (acl) {
 396                 if (acl->dynamic_node_acl) {
 397                         acl->dynamic_node_acl = 0;
 398                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 399                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 400                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 401                         spin_unlock_irq(&tpg->acl_node_lock);
 402                         /*
 403                          * Release the locally allocated struct se_node_acl
 404                          * because * core_tpg_add_initiator_node_acl() returned
 405                          * a pointer to an existing demo mode node ACL.
 406                          */
 407                         if (se_nacl)
 408                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 409                                                         se_nacl);
 410                         goto done;
 411                 }
 412
 413                 pr_err("ACL entry for %s Initiator"
 414                         " Node %s already exists for TPG %u, ignoring"
 415                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 416                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 417                 spin_unlock_irq(&tpg->acl_node_lock);
 418                 return ERR_PTR(-EEXIST);
 419         }
 420         spin_unlock_irq(&tpg->acl_node_lock);
 421
 422         if (!se_nacl) {
 423                 pr_err("struct se_node_acl pointer is NULL\n");
 424                 return ERR_PTR(-EINVAL);
 425         }
 426         /*
 427          * For v4.x logic the se_node_acl_s is hanging off a fabric
 428          * dependent structure allocated via
 429          * struct target_core_fabric_ops->fabric_make_nodeacl()
 430          */
 431         acl = se_nacl;
 432
 433         INIT_LIST_HEAD(&acl->acl_list);
 434         INIT_LIST_HEAD(&acl->acl_sess_list);
 435         kref_init(&acl->acl_kref);
 436         init_completion(&acl->acl_free_comp);
 437         spin_lock_init(&acl->device_list_lock);
 438         spin_lock_init(&acl->nacl_sess_lock);
 439         atomic_set(&acl->acl_pr_ref_count, 0);
 440         acl->queue_depth = queue_depth;
 441         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 442         acl->se_tpg = tpg;
 443         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 444         spin_lock_init(&acl->stats_lock);
 445
 446         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 447
 448         if (core_create_device_list_for_node(acl) < 0) {
 449                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 450                 return ERR_PTR(-ENOMEM);
 451         }
 452
 453         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 454                 core_free_device_list_for_node(acl, tpg);
 455                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 456                 return ERR_PTR(-EINVAL);
 457         }
 458
 459         spin_lock_irq(&tpg->acl_node_lock);
 460         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 461         tpg->num_node_acls++;
 462         spin_unlock_irq(&tpg->acl_node_lock);
 463
 464 done:
 465         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 466                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 467                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 468                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 469
 470         return acl;
 471 }
 472 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 473
 474 /*      core_tpg_del_initiator_node_acl():
 475  *
 476  *
 477  */
 478 int core_tpg_del_initiator_node_acl(
 479         struct se_portal_group *tpg,
 480         struct se_node_acl *acl,
 481         int force)
 482 {
 483         LIST_HEAD(sess_list);
 484         struct se_session *sess, *sess_tmp;
 485         unsigned long flags;
 486         int rc;
 487
 488         spin_lock_irq(&tpg->acl_node_lock);
 489         if (acl->dynamic_node_acl) {
 490                 acl->dynamic_node_acl = 0;
 491         }
 492         list_del(&acl->acl_list);
 493         tpg->num_node_acls--;
 494         spin_unlock_irq(&tpg->acl_node_lock);
 495
 496         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 497         acl->acl_stop = 1;
 498
 499         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 500                                 sess_acl_list) {
 501                 if (sess->sess_tearing_down != 0)
 502                         continue;
 503
 504                 target_get_session(sess);
 505                 list_move(&sess->sess_acl_list, &sess_list);
 506         }
 507         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 508
 509         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 510                 list_del(&sess->sess_acl_list);
 511
 512                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 513                 target_put_session(sess);
 514                 if (!rc)
 515                         continue;
 516                 target_put_session(sess);
 517         }
 518         target_put_nacl(acl);
 519         /*
 520          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 521          * for active fabric session transport_deregister_session() callbacks.
 522          */
 523         wait_for_completion(&acl->acl_free_comp);
 524
 525         core_tpg_wait_for_nacl_pr_ref(acl);
 526         core_clear_initiator_node_from_tpg(acl, tpg);
 527         core_free_device_list_for_node(acl, tpg);
 528
 529         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 530                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 531                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 532                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 533
 534         return 0;
 535 }
 536 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 537
 538 /*      core_tpg_set_initiator_node_queue_depth():
 539  *
 540  *
 541  */
 542 int core_tpg_set_initiator_node_queue_depth(
 543         struct se_portal_group *tpg,
 544         unsigned char *initiatorname,
 545         u32 queue_depth,
 546         int force)
 547 {
 548         struct se_session *sess, *init_sess = NULL;
 549         struct se_node_acl *acl;
 550         unsigned long flags;
 551         int dynamic_acl = 0;
 552
 553         spin_lock_irq(&tpg->acl_node_lock);
 554         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 555         if (!acl) {
 556                 pr_err("Access Control List entry for %s Initiator"
 557                         " Node %s does not exists for TPG %hu, ignoring"
 558                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 559                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 560                 spin_unlock_irq(&tpg->acl_node_lock);
 561                 return -ENODEV;
 562         }
 563         if (acl->dynamic_node_acl) {
 564                 acl->dynamic_node_acl = 0;
 565                 dynamic_acl = 1;
 566         }
 567         spin_unlock_irq(&tpg->acl_node_lock);
 568
 569         spin_lock_irqsave(&tpg->session_lock, flags);
 570         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 571                 if (sess->se_node_acl != acl)
 572                         continue;
 573
 574                 if (!force) {
 575                         pr_err("Unable to change queue depth for %s"
 576                                 " Initiator Node: %s while session is"
 577                                 " operational.  To forcefully change the queue"
 578                                 " depth and force session reinstatement"
 579                                 " use the \"force=1\" parameter.\n",
 580                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 581                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 582
 583                         spin_lock_irq(&tpg->acl_node_lock);
 584                         if (dynamic_acl)
 585                                 acl->dynamic_node_acl = 1;
 586                         spin_unlock_irq(&tpg->acl_node_lock);
 587                         return -EEXIST;
 588                 }
 589                 /*
 590                  * Determine if the session needs to be closed by our context.
 591                  */
 592                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 593                         continue;
 594
 595                 init_sess = sess;
 596                 break;
 597         }
 598
 599         /*
 600          * User has requested to change the queue depth for a Initiator Node.
 601          * Change the value in the Node's struct se_node_acl, and call
 602          * core_set_queue_depth_for_node() to add the requested queue depth.
 603          *
 604          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 605          * reinstatement to occur if there is an active session for the
 606          * $FABRIC_MOD Initiator Node in question.
 607          */
 608         acl->queue_depth = queue_depth;
 609
 610         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 611                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 612                 /*
 613                  * Force session reinstatement if
 614                  * core_set_queue_depth_for_node() failed, because we assume
 615                  * the $FABRIC_MOD has already the set session reinstatement
 616                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 617                  */
 618                 if (init_sess)
 619                         tpg->se_tpg_tfo->close_session(init_sess);
 620
 621                 spin_lock_irq(&tpg->acl_node_lock);
 622                 if (dynamic_acl)
 623                         acl->dynamic_node_acl = 1;
 624                 spin_unlock_irq(&tpg->acl_node_lock);
 625                 return -EINVAL;
 626         }
 627         spin_unlock_irqrestore(&tpg->session_lock, flags);
 628         /*
 629          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 630          * forcefully shutdown the $FABRIC_MOD session/nexus.
 631          */
 632         if (init_sess)
 633                 tpg->se_tpg_tfo->close_session(init_sess);
 634
 635         pr_debug("Successfully changed queue depth to: %d for Initiator"
 636                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 637                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 638                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 639
 640         spin_lock_irq(&tpg->acl_node_lock);
 641         if (dynamic_acl)
 642                 acl->dynamic_node_acl = 1;
 643         spin_unlock_irq(&tpg->acl_node_lock);
 644
 645         return 0;
 646 }
 647 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 648
 649 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 650 {
 651         /* Set in core_dev_setup_virtual_lun0() */
 652         struct se_device *dev = g_lun0_dev;
 653         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 654         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 655         int ret;
 656
 657         lun->unpacked_lun = 0;
 658         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 659         atomic_set(&lun->lun_acl_count, 0);
 660         init_completion(&lun->lun_shutdown_comp);
 661         INIT_LIST_HEAD(&lun->lun_acl_list);
 662         INIT_LIST_HEAD(&lun->lun_cmd_list);
 663         spin_lock_init(&lun->lun_acl_lock);
 664         spin_lock_init(&lun->lun_cmd_lock);
 665         spin_lock_init(&lun->lun_sep_lock);
 666
 667         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 668         if (ret < 0)
 669                 return ret;
 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_status = TRANSPORT_LUN_STATUS_FREE;
 703                 atomic_set(&lun->lun_acl_count, 0);
 704                 init_completion(&lun->lun_shutdown_comp);
 705                 INIT_LIST_HEAD(&lun->lun_acl_list);
 706                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 707                 spin_lock_init(&lun->lun_acl_lock);
 708                 spin_lock_init(&lun->lun_cmd_lock);
 709                 spin_lock_init(&lun->lun_sep_lock);
 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                         kfree(se_tpg);
 727                         return -ENOMEM;
 728                 }
 729         }
 730
 731         spin_lock_bh(&tpg_lock);
 732         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 733         spin_unlock_bh(&tpg_lock);
 734
 735         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 736                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 737                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 738                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 739                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 740
 741         return 0;
 742 }
 743 EXPORT_SYMBOL(core_tpg_register);
 744
 745 int core_tpg_deregister(struct se_portal_group *se_tpg)
 746 {
 747         struct se_node_acl *nacl, *nacl_tmp;
 748
 749         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 750                 " for endpoint: %s Portal Tag %u\n",
 751                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 752                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 753                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 754                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 755
 756         spin_lock_bh(&tpg_lock);
 757         list_del(&se_tpg->se_tpg_node);
 758         spin_unlock_bh(&tpg_lock);
 759
 760         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 761                 cpu_relax();
 762         /*
 763          * Release any remaining demo-mode generated se_node_acl that have
 764          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 765          * in transport_deregister_session().
 766          */
 767         spin_lock_irq(&se_tpg->acl_node_lock);
 768         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 769                         acl_list) {
 770                 list_del(&nacl->acl_list);
 771                 se_tpg->num_node_acls--;
 772                 spin_unlock_irq(&se_tpg->acl_node_lock);
 773
 774                 core_tpg_wait_for_nacl_pr_ref(nacl);
 775                 core_free_device_list_for_node(nacl, se_tpg);
 776                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 777
 778                 spin_lock_irq(&se_tpg->acl_node_lock);
 779         }
 780         spin_unlock_irq(&se_tpg->acl_node_lock);
 781
 782         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 783                 core_tpg_release_virtual_lun0(se_tpg);
 784
 785         se_tpg->se_tpg_fabric_ptr = NULL;
 786         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 787         return 0;
 788 }
 789 EXPORT_SYMBOL(core_tpg_deregister);
 790
 791 struct se_lun *core_tpg_pre_addlun(
 792         struct se_portal_group *tpg,
 793         u32 unpacked_lun)
 794 {
 795         struct se_lun *lun;
 796
 797         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 798                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 799                         "-1: %u for Target Portal Group: %u\n",
 800                         tpg->se_tpg_tfo->get_fabric_name(),
 801                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 802                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 803                 return ERR_PTR(-EOVERFLOW);
 804         }
 805
 806         spin_lock(&tpg->tpg_lun_lock);
 807         lun = tpg->tpg_lun_list[unpacked_lun];
 808         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 809                 pr_err("TPG Logical Unit Number: %u is already active"
 810                         " on %s Target Portal Group: %u, ignoring request.\n",
 811                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 812                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 813                 spin_unlock(&tpg->tpg_lun_lock);
 814                 return ERR_PTR(-EINVAL);
 815         }
 816         spin_unlock(&tpg->tpg_lun_lock);
 817
 818         return lun;
 819 }
 820
 821 int core_tpg_post_addlun(
 822         struct se_portal_group *tpg,
 823         struct se_lun *lun,
 824         u32 lun_access,
 825         void *lun_ptr)
 826 {
 827         int ret;
 828
 829         ret = core_dev_export(lun_ptr, tpg, lun);
 830         if (ret < 0)
 831                 return ret;
 832
 833         spin_lock(&tpg->tpg_lun_lock);
 834         lun->lun_access = lun_access;
 835         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 836         spin_unlock(&tpg->tpg_lun_lock);
 837
 838         return 0;
 839 }
 840
 841 static void core_tpg_shutdown_lun(
 842         struct se_portal_group *tpg,
 843         struct se_lun *lun)
 844 {
 845         core_clear_lun_from_tpg(lun, tpg);
 846         transport_clear_lun_from_sessions(lun);
 847 }
 848
 849 struct se_lun *core_tpg_pre_dellun(
 850         struct se_portal_group *tpg,
 851         u32 unpacked_lun)
 852 {
 853         struct se_lun *lun;
 854
 855         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 856                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 857                         "-1: %u for Target Portal Group: %u\n",
 858                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 859                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 860                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 861                 return ERR_PTR(-EOVERFLOW);
 862         }
 863
 864         spin_lock(&tpg->tpg_lun_lock);
 865         lun = tpg->tpg_lun_list[unpacked_lun];
 866         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 867                 pr_err("%s Logical Unit Number: %u is not active on"
 868                         " Target Portal Group: %u, ignoring request.\n",
 869                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 870                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 871                 spin_unlock(&tpg->tpg_lun_lock);
 872                 return ERR_PTR(-ENODEV);
 873         }
 874         spin_unlock(&tpg->tpg_lun_lock);
 875
 876         return lun;
 877 }
 878
 879 int core_tpg_post_dellun(
 880         struct se_portal_group *tpg,
 881         struct se_lun *lun)
 882 {
 883         core_tpg_shutdown_lun(tpg, 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 }