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
  64         spin_lock_irq(&nacl->device_list_lock);
  65         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  66                 deve = nacl->device_list[i];
  67
  68                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  69                         continue;
  70
  71                 if (!deve->se_lun) {
  72                         pr_err("%s device entries device pointer is"
  73                                 " NULL, but Initiator has access.\n",
  74                                 tpg->se_tpg_tfo->get_fabric_name());
  75                         continue;
  76                 }
  77
  78                 lun = deve->se_lun;
  79                 spin_unlock_irq(&nacl->device_list_lock);
  80                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  81                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  82
  83                 spin_lock_irq(&nacl->device_list_lock);
  84         }
  85         spin_unlock_irq(&nacl->device_list_lock);
  86 }
  87
  88 /*      __core_tpg_get_initiator_node_acl():
  89  *
  90  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  91  */
  92 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  93         struct se_portal_group *tpg,
  94         const char *initiatorname)
  95 {
  96         struct se_node_acl *acl;
  97
  98         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  99                 if (!strcmp(acl->initiatorname, initiatorname))
 100                         return acl;
 101         }
 102
 103         return NULL;
 104 }
 105
 106 /*      core_tpg_get_initiator_node_acl():
 107  *
 108  *
 109  */
 110 struct se_node_acl *core_tpg_get_initiator_node_acl(
 111         struct se_portal_group *tpg,
 112         unsigned char *initiatorname)
 113 {
 114         struct se_node_acl *acl;
 115
 116         spin_lock_irq(&tpg->acl_node_lock);
 117         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 118                 if (!strcmp(acl->initiatorname, initiatorname) &&
 119                     !acl->dynamic_node_acl) {
 120                         spin_unlock_irq(&tpg->acl_node_lock);
 121                         return acl;
 122                 }
 123         }
 124         spin_unlock_irq(&tpg->acl_node_lock);
 125
 126         return NULL;
 127 }
 128
 129 /*      core_tpg_add_node_to_devs():
 130  *
 131  *
 132  */
 133 void core_tpg_add_node_to_devs(
 134         struct se_node_acl *acl,
 135         struct se_portal_group *tpg)
 136 {
 137         int i = 0;
 138         u32 lun_access = 0;
 139         struct se_lun *lun;
 140         struct se_device *dev;
 141
 142         spin_lock(&tpg->tpg_lun_lock);
 143         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 144                 lun = tpg->tpg_lun_list[i];
 145                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 146                         continue;
 147
 148                 spin_unlock(&tpg->tpg_lun_lock);
 149
 150                 dev = lun->lun_se_dev;
 151                 /*
 152                  * By default in LIO-Target $FABRIC_MOD,
 153                  * demo_mode_write_protect is ON, or READ_ONLY;
 154                  */
 155                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 156                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 157                 } else {
 158                         /*
 159                          * Allow only optical drives to issue R/W in default RO
 160                          * demo mode.
 161                          */
 162                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 163                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 164                         else
 165                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 166                 }
 167
 168                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 169                         " access for LUN in Demo Mode\n",
 170                         tpg->se_tpg_tfo->get_fabric_name(),
 171                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 172                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 173                         "READ-WRITE" : "READ-ONLY");
 174
 175                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 176                                 lun_access, acl, tpg, 1);
 177                 spin_lock(&tpg->tpg_lun_lock);
 178         }
 179         spin_unlock(&tpg->tpg_lun_lock);
 180 }
 181
 182 /*      core_set_queue_depth_for_node():
 183  *
 184  *
 185  */
 186 static int core_set_queue_depth_for_node(
 187         struct se_portal_group *tpg,
 188         struct se_node_acl *acl)
 189 {
 190         if (!acl->queue_depth) {
 191                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 192                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 193                         acl->initiatorname);
 194                 acl->queue_depth = 1;
 195         }
 196
 197         return 0;
 198 }
 199
 200 void array_free(void *array, int n)
 201 {
 202         void **a = array;
 203         int i;
 204
 205         for (i = 0; i < n; i++)
 206                 kfree(a[i]);
 207         kfree(a);
 208 }
 209
 210 static void *array_zalloc(int n, size_t size, gfp_t flags)
 211 {
 212         void **a;
 213         int i;
 214
 215         a = kzalloc(n * sizeof(void*), flags);
 216         if (!a)
 217                 return NULL;
 218         for (i = 0; i < n; i++) {
 219                 a[i] = kzalloc(size, flags);
 220                 if (!a[i]) {
 221                         array_free(a, n);
 222                         return NULL;
 223                 }
 224         }
 225         return a;
 226 }
 227
 228 /*      core_create_device_list_for_node():
 229  *
 230  *
 231  */
 232 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 233 {
 234         struct se_dev_entry *deve;
 235         int i;
 236
 237         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 238                         sizeof(struct se_dev_entry), GFP_KERNEL);
 239         if (!nacl->device_list) {
 240                 pr_err("Unable to allocate memory for"
 241                         " struct se_node_acl->device_list\n");
 242                 return -ENOMEM;
 243         }
 244         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 245                 deve = nacl->device_list[i];
 246
 247                 atomic_set(&deve->ua_count, 0);
 248                 atomic_set(&deve->pr_ref_count, 0);
 249                 spin_lock_init(&deve->ua_lock);
 250                 INIT_LIST_HEAD(&deve->alua_port_list);
 251                 INIT_LIST_HEAD(&deve->ua_list);
 252         }
 253
 254         return 0;
 255 }
 256
 257 /*      core_tpg_check_initiator_node_acl()
 258  *
 259  *
 260  */
 261 struct se_node_acl *core_tpg_check_initiator_node_acl(
 262         struct se_portal_group *tpg,
 263         unsigned char *initiatorname)
 264 {
 265         struct se_node_acl *acl;
 266
 267         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 268         if (acl)
 269                 return acl;
 270
 271         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 272                 return NULL;
 273
 274         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 275         if (!acl)
 276                 return NULL;
 277
 278         INIT_LIST_HEAD(&acl->acl_list);
 279         INIT_LIST_HEAD(&acl->acl_sess_list);
 280         kref_init(&acl->acl_kref);
 281         init_completion(&acl->acl_free_comp);
 282         spin_lock_init(&acl->device_list_lock);
 283         spin_lock_init(&acl->nacl_sess_lock);
 284         atomic_set(&acl->acl_pr_ref_count, 0);
 285         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 286         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 287         acl->se_tpg = tpg;
 288         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 289         spin_lock_init(&acl->stats_lock);
 290         acl->dynamic_node_acl = 1;
 291
 292         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 293
 294         if (core_create_device_list_for_node(acl) < 0) {
 295                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 296                 return NULL;
 297         }
 298
 299         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 300                 core_free_device_list_for_node(acl, tpg);
 301                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 302                 return NULL;
 303         }
 304         /*
 305          * Here we only create demo-mode MappedLUNs from the active
 306          * TPG LUNs if the fabric is not explictly asking for
 307          * tpg_check_demo_mode_login_only() == 1.
 308          */
 309         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 310             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 311                 do { ; } while (0);
 312         else
 313                 core_tpg_add_node_to_devs(acl, tpg);
 314
 315         spin_lock_irq(&tpg->acl_node_lock);
 316         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 317         tpg->num_node_acls++;
 318         spin_unlock_irq(&tpg->acl_node_lock);
 319
 320         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 321                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 322                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 323                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 324
 325         return acl;
 326 }
 327 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 328
 329 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 330 {
 331         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 332                 cpu_relax();
 333 }
 334
 335 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 336 {
 337         int i;
 338         struct se_lun *lun;
 339
 340         spin_lock(&tpg->tpg_lun_lock);
 341         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 342                 lun = tpg->tpg_lun_list[i];
 343
 344                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 345                     (lun->lun_se_dev == NULL))
 346                         continue;
 347
 348                 spin_unlock(&tpg->tpg_lun_lock);
 349                 core_dev_del_lun(tpg, lun->unpacked_lun);
 350                 spin_lock(&tpg->tpg_lun_lock);
 351         }
 352         spin_unlock(&tpg->tpg_lun_lock);
 353 }
 354 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 355
 356 /*      core_tpg_add_initiator_node_acl():
 357  *
 358  *
 359  */
 360 struct se_node_acl *core_tpg_add_initiator_node_acl(
 361         struct se_portal_group *tpg,
 362         struct se_node_acl *se_nacl,
 363         const char *initiatorname,
 364         u32 queue_depth)
 365 {
 366         struct se_node_acl *acl = NULL;
 367
 368         spin_lock_irq(&tpg->acl_node_lock);
 369         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 370         if (acl) {
 371                 if (acl->dynamic_node_acl) {
 372                         acl->dynamic_node_acl = 0;
 373                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 374                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 375                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 376                         spin_unlock_irq(&tpg->acl_node_lock);
 377                         /*
 378                          * Release the locally allocated struct se_node_acl
 379                          * because * core_tpg_add_initiator_node_acl() returned
 380                          * a pointer to an existing demo mode node ACL.
 381                          */
 382                         if (se_nacl)
 383                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 384                                                         se_nacl);
 385                         goto done;
 386                 }
 387
 388                 pr_err("ACL entry for %s Initiator"
 389                         " Node %s already exists for TPG %u, ignoring"
 390                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 391                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 392                 spin_unlock_irq(&tpg->acl_node_lock);
 393                 return ERR_PTR(-EEXIST);
 394         }
 395         spin_unlock_irq(&tpg->acl_node_lock);
 396
 397         if (!se_nacl) {
 398                 pr_err("struct se_node_acl pointer is NULL\n");
 399                 return ERR_PTR(-EINVAL);
 400         }
 401         /*
 402          * For v4.x logic the se_node_acl_s is hanging off a fabric
 403          * dependent structure allocated via
 404          * struct target_core_fabric_ops->fabric_make_nodeacl()
 405          */
 406         acl = se_nacl;
 407
 408         INIT_LIST_HEAD(&acl->acl_list);
 409         INIT_LIST_HEAD(&acl->acl_sess_list);
 410         kref_init(&acl->acl_kref);
 411         init_completion(&acl->acl_free_comp);
 412         spin_lock_init(&acl->device_list_lock);
 413         spin_lock_init(&acl->nacl_sess_lock);
 414         atomic_set(&acl->acl_pr_ref_count, 0);
 415         acl->queue_depth = queue_depth;
 416         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 417         acl->se_tpg = tpg;
 418         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 419         spin_lock_init(&acl->stats_lock);
 420
 421         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 422
 423         if (core_create_device_list_for_node(acl) < 0) {
 424                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 425                 return ERR_PTR(-ENOMEM);
 426         }
 427
 428         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 429                 core_free_device_list_for_node(acl, tpg);
 430                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 431                 return ERR_PTR(-EINVAL);
 432         }
 433
 434         spin_lock_irq(&tpg->acl_node_lock);
 435         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 436         tpg->num_node_acls++;
 437         spin_unlock_irq(&tpg->acl_node_lock);
 438
 439 done:
 440         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 441                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 442                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 443                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 444
 445         return acl;
 446 }
 447 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 448
 449 /*      core_tpg_del_initiator_node_acl():
 450  *
 451  *
 452  */
 453 int core_tpg_del_initiator_node_acl(
 454         struct se_portal_group *tpg,
 455         struct se_node_acl *acl,
 456         int force)
 457 {
 458         LIST_HEAD(sess_list);
 459         struct se_session *sess, *sess_tmp;
 460         unsigned long flags;
 461         int rc;
 462
 463         spin_lock_irq(&tpg->acl_node_lock);
 464         if (acl->dynamic_node_acl) {
 465                 acl->dynamic_node_acl = 0;
 466         }
 467         list_del(&acl->acl_list);
 468         tpg->num_node_acls--;
 469         spin_unlock_irq(&tpg->acl_node_lock);
 470
 471         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 472         acl->acl_stop = 1;
 473
 474         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 475                                 sess_acl_list) {
 476                 if (sess->sess_tearing_down != 0)
 477                         continue;
 478
 479                 target_get_session(sess);
 480                 list_move(&sess->sess_acl_list, &sess_list);
 481         }
 482         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 483
 484         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 485                 list_del(&sess->sess_acl_list);
 486
 487                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 488                 target_put_session(sess);
 489                 if (!rc)
 490                         continue;
 491                 target_put_session(sess);
 492         }
 493         target_put_nacl(acl);
 494         /*
 495          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 496          * for active fabric session transport_deregister_session() callbacks.
 497          */
 498         wait_for_completion(&acl->acl_free_comp);
 499
 500         core_tpg_wait_for_nacl_pr_ref(acl);
 501         core_clear_initiator_node_from_tpg(acl, tpg);
 502         core_free_device_list_for_node(acl, tpg);
 503
 504         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 505                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 506                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 507                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 508
 509         return 0;
 510 }
 511 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 512
 513 /*      core_tpg_set_initiator_node_queue_depth():
 514  *
 515  *
 516  */
 517 int core_tpg_set_initiator_node_queue_depth(
 518         struct se_portal_group *tpg,
 519         unsigned char *initiatorname,
 520         u32 queue_depth,
 521         int force)
 522 {
 523         struct se_session *sess, *init_sess = NULL;
 524         struct se_node_acl *acl;
 525         unsigned long flags;
 526         int dynamic_acl = 0;
 527
 528         spin_lock_irq(&tpg->acl_node_lock);
 529         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 530         if (!acl) {
 531                 pr_err("Access Control List entry for %s Initiator"
 532                         " Node %s does not exists for TPG %hu, ignoring"
 533                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 534                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 535                 spin_unlock_irq(&tpg->acl_node_lock);
 536                 return -ENODEV;
 537         }
 538         if (acl->dynamic_node_acl) {
 539                 acl->dynamic_node_acl = 0;
 540                 dynamic_acl = 1;
 541         }
 542         spin_unlock_irq(&tpg->acl_node_lock);
 543
 544         spin_lock_irqsave(&tpg->session_lock, flags);
 545         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 546                 if (sess->se_node_acl != acl)
 547                         continue;
 548
 549                 if (!force) {
 550                         pr_err("Unable to change queue depth for %s"
 551                                 " Initiator Node: %s while session is"
 552                                 " operational.  To forcefully change the queue"
 553                                 " depth and force session reinstatement"
 554                                 " use the \"force=1\" parameter.\n",
 555                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 556                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 557
 558                         spin_lock_irq(&tpg->acl_node_lock);
 559                         if (dynamic_acl)
 560                                 acl->dynamic_node_acl = 1;
 561                         spin_unlock_irq(&tpg->acl_node_lock);
 562                         return -EEXIST;
 563                 }
 564                 /*
 565                  * Determine if the session needs to be closed by our context.
 566                  */
 567                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 568                         continue;
 569
 570                 init_sess = sess;
 571                 break;
 572         }
 573
 574         /*
 575          * User has requested to change the queue depth for a Initiator Node.
 576          * Change the value in the Node's struct se_node_acl, and call
 577          * core_set_queue_depth_for_node() to add the requested queue depth.
 578          *
 579          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 580          * reinstatement to occur if there is an active session for the
 581          * $FABRIC_MOD Initiator Node in question.
 582          */
 583         acl->queue_depth = queue_depth;
 584
 585         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 586                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 587                 /*
 588                  * Force session reinstatement if
 589                  * core_set_queue_depth_for_node() failed, because we assume
 590                  * the $FABRIC_MOD has already the set session reinstatement
 591                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 592                  */
 593                 if (init_sess)
 594                         tpg->se_tpg_tfo->close_session(init_sess);
 595
 596                 spin_lock_irq(&tpg->acl_node_lock);
 597                 if (dynamic_acl)
 598                         acl->dynamic_node_acl = 1;
 599                 spin_unlock_irq(&tpg->acl_node_lock);
 600                 return -EINVAL;
 601         }
 602         spin_unlock_irqrestore(&tpg->session_lock, flags);
 603         /*
 604          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 605          * forcefully shutdown the $FABRIC_MOD session/nexus.
 606          */
 607         if (init_sess)
 608                 tpg->se_tpg_tfo->close_session(init_sess);
 609
 610         pr_debug("Successfully changed queue depth to: %d for Initiator"
 611                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 612                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 613                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 614
 615         spin_lock_irq(&tpg->acl_node_lock);
 616         if (dynamic_acl)
 617                 acl->dynamic_node_acl = 1;
 618         spin_unlock_irq(&tpg->acl_node_lock);
 619
 620         return 0;
 621 }
 622 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 623
 624 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 625 {
 626         /* Set in core_dev_setup_virtual_lun0() */
 627         struct se_device *dev = g_lun0_dev;
 628         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 629         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 630         int ret;
 631
 632         lun->unpacked_lun = 0;
 633         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 634         atomic_set(&lun->lun_acl_count, 0);
 635         init_completion(&lun->lun_shutdown_comp);
 636         INIT_LIST_HEAD(&lun->lun_acl_list);
 637         INIT_LIST_HEAD(&lun->lun_cmd_list);
 638         spin_lock_init(&lun->lun_acl_lock);
 639         spin_lock_init(&lun->lun_cmd_lock);
 640         spin_lock_init(&lun->lun_sep_lock);
 641
 642         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 643         if (ret < 0)
 644                 return ret;
 645
 646         return 0;
 647 }
 648
 649 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 650 {
 651         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 652
 653         core_tpg_post_dellun(se_tpg, lun);
 654 }
 655
 656 int core_tpg_register(
 657         struct target_core_fabric_ops *tfo,
 658         struct se_wwn *se_wwn,
 659         struct se_portal_group *se_tpg,
 660         void *tpg_fabric_ptr,
 661         int se_tpg_type)
 662 {
 663         struct se_lun *lun;
 664         u32 i;
 665
 666         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 667                         sizeof(struct se_lun), GFP_KERNEL);
 668         if (!se_tpg->tpg_lun_list) {
 669                 pr_err("Unable to allocate struct se_portal_group->"
 670                                 "tpg_lun_list\n");
 671                 return -ENOMEM;
 672         }
 673
 674         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 675                 lun = se_tpg->tpg_lun_list[i];
 676                 lun->unpacked_lun = i;
 677                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 678                 atomic_set(&lun->lun_acl_count, 0);
 679                 init_completion(&lun->lun_shutdown_comp);
 680                 INIT_LIST_HEAD(&lun->lun_acl_list);
 681                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 682                 spin_lock_init(&lun->lun_acl_lock);
 683                 spin_lock_init(&lun->lun_cmd_lock);
 684                 spin_lock_init(&lun->lun_sep_lock);
 685         }
 686
 687         se_tpg->se_tpg_type = se_tpg_type;
 688         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 689         se_tpg->se_tpg_tfo = tfo;
 690         se_tpg->se_tpg_wwn = se_wwn;
 691         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 692         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 693         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 694         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 695         spin_lock_init(&se_tpg->acl_node_lock);
 696         spin_lock_init(&se_tpg->session_lock);
 697         spin_lock_init(&se_tpg->tpg_lun_lock);
 698
 699         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 700                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 701                         kfree(se_tpg);
 702                         return -ENOMEM;
 703                 }
 704         }
 705
 706         spin_lock_bh(&tpg_lock);
 707         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 708         spin_unlock_bh(&tpg_lock);
 709
 710         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 711                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 712                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 713                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 714                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 715
 716         return 0;
 717 }
 718 EXPORT_SYMBOL(core_tpg_register);
 719
 720 int core_tpg_deregister(struct se_portal_group *se_tpg)
 721 {
 722         struct se_node_acl *nacl, *nacl_tmp;
 723
 724         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 725                 " for endpoint: %s Portal Tag %u\n",
 726                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 727                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 728                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 729                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 730
 731         spin_lock_bh(&tpg_lock);
 732         list_del(&se_tpg->se_tpg_node);
 733         spin_unlock_bh(&tpg_lock);
 734
 735         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 736                 cpu_relax();
 737         /*
 738          * Release any remaining demo-mode generated se_node_acl that have
 739          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 740          * in transport_deregister_session().
 741          */
 742         spin_lock_irq(&se_tpg->acl_node_lock);
 743         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 744                         acl_list) {
 745                 list_del(&nacl->acl_list);
 746                 se_tpg->num_node_acls--;
 747                 spin_unlock_irq(&se_tpg->acl_node_lock);
 748
 749                 core_tpg_wait_for_nacl_pr_ref(nacl);
 750                 core_free_device_list_for_node(nacl, se_tpg);
 751                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 752
 753                 spin_lock_irq(&se_tpg->acl_node_lock);
 754         }
 755         spin_unlock_irq(&se_tpg->acl_node_lock);
 756
 757         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 758                 core_tpg_release_virtual_lun0(se_tpg);
 759
 760         se_tpg->se_tpg_fabric_ptr = NULL;
 761         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 762         return 0;
 763 }
 764 EXPORT_SYMBOL(core_tpg_deregister);
 765
 766 struct se_lun *core_tpg_pre_addlun(
 767         struct se_portal_group *tpg,
 768         u32 unpacked_lun)
 769 {
 770         struct se_lun *lun;
 771
 772         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 773                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 774                         "-1: %u for Target Portal Group: %u\n",
 775                         tpg->se_tpg_tfo->get_fabric_name(),
 776                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 777                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 778                 return ERR_PTR(-EOVERFLOW);
 779         }
 780
 781         spin_lock(&tpg->tpg_lun_lock);
 782         lun = tpg->tpg_lun_list[unpacked_lun];
 783         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 784                 pr_err("TPG Logical Unit Number: %u is already active"
 785                         " on %s Target Portal Group: %u, ignoring request.\n",
 786                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 787                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 788                 spin_unlock(&tpg->tpg_lun_lock);
 789                 return ERR_PTR(-EINVAL);
 790         }
 791         spin_unlock(&tpg->tpg_lun_lock);
 792
 793         return lun;
 794 }
 795
 796 int core_tpg_post_addlun(
 797         struct se_portal_group *tpg,
 798         struct se_lun *lun,
 799         u32 lun_access,
 800         void *lun_ptr)
 801 {
 802         int ret;
 803
 804         ret = core_dev_export(lun_ptr, tpg, lun);
 805         if (ret < 0)
 806                 return ret;
 807
 808         spin_lock(&tpg->tpg_lun_lock);
 809         lun->lun_access = lun_access;
 810         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 811         spin_unlock(&tpg->tpg_lun_lock);
 812
 813         return 0;
 814 }
 815
 816 static void core_tpg_shutdown_lun(
 817         struct se_portal_group *tpg,
 818         struct se_lun *lun)
 819 {
 820         core_clear_lun_from_tpg(lun, tpg);
 821         transport_clear_lun_from_sessions(lun);
 822 }
 823
 824 struct se_lun *core_tpg_pre_dellun(
 825         struct se_portal_group *tpg,
 826         u32 unpacked_lun)
 827 {
 828         struct se_lun *lun;
 829
 830         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 831                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 832                         "-1: %u for Target Portal Group: %u\n",
 833                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 834                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 835                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 836                 return ERR_PTR(-EOVERFLOW);
 837         }
 838
 839         spin_lock(&tpg->tpg_lun_lock);
 840         lun = tpg->tpg_lun_list[unpacked_lun];
 841         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 842                 pr_err("%s Logical Unit Number: %u is not active on"
 843                         " Target Portal Group: %u, ignoring request.\n",
 844                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 845                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 846                 spin_unlock(&tpg->tpg_lun_lock);
 847                 return ERR_PTR(-ENODEV);
 848         }
 849         spin_unlock(&tpg->tpg_lun_lock);
 850
 851         return lun;
 852 }
 853
 854 int core_tpg_post_dellun(
 855         struct se_portal_group *tpg,
 856         struct se_lun *lun)
 857 {
 858         core_tpg_shutdown_lun(tpg, lun);
 859
 860         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 861
 862         spin_lock(&tpg->tpg_lun_lock);
 863         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 864         spin_unlock(&tpg->tpg_lun_lock);
 865
 866         return 0;
 867 }