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 /*      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 = kzalloc(sizeof(struct se_dev_entry) *
 235                                 TRANSPORT_MAX_LUNS_PER_TPG, 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         spin_lock_init(&acl->device_list_lock);
 278         spin_lock_init(&acl->nacl_sess_lock);
 279         atomic_set(&acl->acl_pr_ref_count, 0);
 280         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 281         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 282         acl->se_tpg = tpg;
 283         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 284         spin_lock_init(&acl->stats_lock);
 285         acl->dynamic_node_acl = 1;
 286
 287         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 288
 289         if (core_create_device_list_for_node(acl) < 0) {
 290                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 291                 return NULL;
 292         }
 293
 294         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 295                 core_free_device_list_for_node(acl, tpg);
 296                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 297                 return NULL;
 298         }
 299         /*
 300          * Here we only create demo-mode MappedLUNs from the active
 301          * TPG LUNs if the fabric is not explictly asking for
 302          * tpg_check_demo_mode_login_only() == 1.
 303          */
 304         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 305             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 306                 do { ; } while (0);
 307         else
 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, ret;
 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                 ret = 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         spin_lock_init(&acl->device_list_lock);
 406         spin_lock_init(&acl->nacl_sess_lock);
 407         atomic_set(&acl->acl_pr_ref_count, 0);
 408         acl->queue_depth = queue_depth;
 409         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 410         acl->se_tpg = tpg;
 411         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 412         spin_lock_init(&acl->stats_lock);
 413
 414         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 415
 416         if (core_create_device_list_for_node(acl) < 0) {
 417                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 418                 return ERR_PTR(-ENOMEM);
 419         }
 420
 421         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 422                 core_free_device_list_for_node(acl, tpg);
 423                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 424                 return ERR_PTR(-EINVAL);
 425         }
 426
 427         spin_lock_irq(&tpg->acl_node_lock);
 428         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 429         tpg->num_node_acls++;
 430         spin_unlock_irq(&tpg->acl_node_lock);
 431
 432 done:
 433         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 434                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 435                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 436                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 437
 438         return acl;
 439 }
 440 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 441
 442 /*      core_tpg_del_initiator_node_acl():
 443  *
 444  *
 445  */
 446 int core_tpg_del_initiator_node_acl(
 447         struct se_portal_group *tpg,
 448         struct se_node_acl *acl,
 449         int force)
 450 {
 451         struct se_session *sess, *sess_tmp;
 452         unsigned long flags;
 453         int dynamic_acl = 0;
 454
 455         spin_lock_irq(&tpg->acl_node_lock);
 456         if (acl->dynamic_node_acl) {
 457                 acl->dynamic_node_acl = 0;
 458                 dynamic_acl = 1;
 459         }
 460         list_del(&acl->acl_list);
 461         tpg->num_node_acls--;
 462         spin_unlock_irq(&tpg->acl_node_lock);
 463
 464         spin_lock_irqsave(&tpg->session_lock, flags);
 465         list_for_each_entry_safe(sess, sess_tmp,
 466                                 &tpg->tpg_sess_list, sess_list) {
 467                 if (sess->se_node_acl != acl)
 468                         continue;
 469                 /*
 470                  * Determine if the session needs to be closed by our context.
 471                  */
 472                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 473                         continue;
 474
 475                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 476                 /*
 477                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 478                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 479                  */
 480                 tpg->se_tpg_tfo->close_session(sess);
 481
 482                 spin_lock_irqsave(&tpg->session_lock, flags);
 483         }
 484         spin_unlock_irqrestore(&tpg->session_lock, flags);
 485
 486         core_tpg_wait_for_nacl_pr_ref(acl);
 487         core_clear_initiator_node_from_tpg(acl, tpg);
 488         core_free_device_list_for_node(acl, tpg);
 489
 490         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 491                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 492                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 493                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 494
 495         return 0;
 496 }
 497 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 498
 499 /*      core_tpg_set_initiator_node_queue_depth():
 500  *
 501  *
 502  */
 503 int core_tpg_set_initiator_node_queue_depth(
 504         struct se_portal_group *tpg,
 505         unsigned char *initiatorname,
 506         u32 queue_depth,
 507         int force)
 508 {
 509         struct se_session *sess, *init_sess = NULL;
 510         struct se_node_acl *acl;
 511         unsigned long flags;
 512         int dynamic_acl = 0;
 513
 514         spin_lock_irq(&tpg->acl_node_lock);
 515         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 516         if (!acl) {
 517                 pr_err("Access Control List entry for %s Initiator"
 518                         " Node %s does not exists for TPG %hu, ignoring"
 519                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 520                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 521                 spin_unlock_irq(&tpg->acl_node_lock);
 522                 return -ENODEV;
 523         }
 524         if (acl->dynamic_node_acl) {
 525                 acl->dynamic_node_acl = 0;
 526                 dynamic_acl = 1;
 527         }
 528         spin_unlock_irq(&tpg->acl_node_lock);
 529
 530         spin_lock_irqsave(&tpg->session_lock, flags);
 531         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 532                 if (sess->se_node_acl != acl)
 533                         continue;
 534
 535                 if (!force) {
 536                         pr_err("Unable to change queue depth for %s"
 537                                 " Initiator Node: %s while session is"
 538                                 " operational.  To forcefully change the queue"
 539                                 " depth and force session reinstatement"
 540                                 " use the \"force=1\" parameter.\n",
 541                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 542                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 543
 544                         spin_lock_irq(&tpg->acl_node_lock);
 545                         if (dynamic_acl)
 546                                 acl->dynamic_node_acl = 1;
 547                         spin_unlock_irq(&tpg->acl_node_lock);
 548                         return -EEXIST;
 549                 }
 550                 /*
 551                  * Determine if the session needs to be closed by our context.
 552                  */
 553                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 554                         continue;
 555
 556                 init_sess = sess;
 557                 break;
 558         }
 559
 560         /*
 561          * User has requested to change the queue depth for a Initiator Node.
 562          * Change the value in the Node's struct se_node_acl, and call
 563          * core_set_queue_depth_for_node() to add the requested queue depth.
 564          *
 565          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 566          * reinstatement to occur if there is an active session for the
 567          * $FABRIC_MOD Initiator Node in question.
 568          */
 569         acl->queue_depth = queue_depth;
 570
 571         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 572                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 573                 /*
 574                  * Force session reinstatement if
 575                  * core_set_queue_depth_for_node() failed, because we assume
 576                  * the $FABRIC_MOD has already the set session reinstatement
 577                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 578                  */
 579                 if (init_sess)
 580                         tpg->se_tpg_tfo->close_session(init_sess);
 581
 582                 spin_lock_irq(&tpg->acl_node_lock);
 583                 if (dynamic_acl)
 584                         acl->dynamic_node_acl = 1;
 585                 spin_unlock_irq(&tpg->acl_node_lock);
 586                 return -EINVAL;
 587         }
 588         spin_unlock_irqrestore(&tpg->session_lock, flags);
 589         /*
 590          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 591          * forcefully shutdown the $FABRIC_MOD session/nexus.
 592          */
 593         if (init_sess)
 594                 tpg->se_tpg_tfo->close_session(init_sess);
 595
 596         pr_debug("Successfully changed queue depth to: %d for Initiator"
 597                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 598                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 599                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 600
 601         spin_lock_irq(&tpg->acl_node_lock);
 602         if (dynamic_acl)
 603                 acl->dynamic_node_acl = 1;
 604         spin_unlock_irq(&tpg->acl_node_lock);
 605
 606         return 0;
 607 }
 608 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 609
 610 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 611 {
 612         /* Set in core_dev_setup_virtual_lun0() */
 613         struct se_device *dev = g_lun0_dev;
 614         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 615         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 616         int ret;
 617
 618         lun->unpacked_lun = 0;
 619         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 620         atomic_set(&lun->lun_acl_count, 0);
 621         init_completion(&lun->lun_shutdown_comp);
 622         INIT_LIST_HEAD(&lun->lun_acl_list);
 623         INIT_LIST_HEAD(&lun->lun_cmd_list);
 624         spin_lock_init(&lun->lun_acl_lock);
 625         spin_lock_init(&lun->lun_cmd_lock);
 626         spin_lock_init(&lun->lun_sep_lock);
 627
 628         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 629         if (ret < 0)
 630                 return ret;
 631
 632         return 0;
 633 }
 634
 635 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 636 {
 637         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 638
 639         core_tpg_post_dellun(se_tpg, lun);
 640 }
 641
 642 int core_tpg_register(
 643         struct target_core_fabric_ops *tfo,
 644         struct se_wwn *se_wwn,
 645         struct se_portal_group *se_tpg,
 646         void *tpg_fabric_ptr,
 647         int se_tpg_type)
 648 {
 649         struct se_lun *lun;
 650         u32 i;
 651
 652         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 653                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 654         if (!se_tpg->tpg_lun_list) {
 655                 pr_err("Unable to allocate struct se_portal_group->"
 656                                 "tpg_lun_list\n");
 657                 return -ENOMEM;
 658         }
 659
 660         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 661                 lun = &se_tpg->tpg_lun_list[i];
 662                 lun->unpacked_lun = i;
 663                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 664                 atomic_set(&lun->lun_acl_count, 0);
 665                 init_completion(&lun->lun_shutdown_comp);
 666                 INIT_LIST_HEAD(&lun->lun_acl_list);
 667                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 668                 spin_lock_init(&lun->lun_acl_lock);
 669                 spin_lock_init(&lun->lun_cmd_lock);
 670                 spin_lock_init(&lun->lun_sep_lock);
 671         }
 672
 673         se_tpg->se_tpg_type = se_tpg_type;
 674         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 675         se_tpg->se_tpg_tfo = tfo;
 676         se_tpg->se_tpg_wwn = se_wwn;
 677         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 678         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 679         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 680         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 681         spin_lock_init(&se_tpg->acl_node_lock);
 682         spin_lock_init(&se_tpg->session_lock);
 683         spin_lock_init(&se_tpg->tpg_lun_lock);
 684
 685         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 686                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 687                         kfree(se_tpg);
 688                         return -ENOMEM;
 689                 }
 690         }
 691
 692         spin_lock_bh(&tpg_lock);
 693         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 694         spin_unlock_bh(&tpg_lock);
 695
 696         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 697                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 698                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 699                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 700                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 701
 702         return 0;
 703 }
 704 EXPORT_SYMBOL(core_tpg_register);
 705
 706 int core_tpg_deregister(struct se_portal_group *se_tpg)
 707 {
 708         struct se_node_acl *nacl, *nacl_tmp;
 709
 710         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 711                 " for endpoint: %s Portal Tag %u\n",
 712                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 713                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 714                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 715                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 716
 717         spin_lock_bh(&tpg_lock);
 718         list_del(&se_tpg->se_tpg_node);
 719         spin_unlock_bh(&tpg_lock);
 720
 721         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 722                 cpu_relax();
 723         /*
 724          * Release any remaining demo-mode generated se_node_acl that have
 725          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 726          * in transport_deregister_session().
 727          */
 728         spin_lock_irq(&se_tpg->acl_node_lock);
 729         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 730                         acl_list) {
 731                 list_del(&nacl->acl_list);
 732                 se_tpg->num_node_acls--;
 733                 spin_unlock_irq(&se_tpg->acl_node_lock);
 734
 735                 core_tpg_wait_for_nacl_pr_ref(nacl);
 736                 core_free_device_list_for_node(nacl, se_tpg);
 737                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 738
 739                 spin_lock_irq(&se_tpg->acl_node_lock);
 740         }
 741         spin_unlock_irq(&se_tpg->acl_node_lock);
 742
 743         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 744                 core_tpg_release_virtual_lun0(se_tpg);
 745
 746         se_tpg->se_tpg_fabric_ptr = NULL;
 747         kfree(se_tpg->tpg_lun_list);
 748         return 0;
 749 }
 750 EXPORT_SYMBOL(core_tpg_deregister);
 751
 752 struct se_lun *core_tpg_pre_addlun(
 753         struct se_portal_group *tpg,
 754         u32 unpacked_lun)
 755 {
 756         struct se_lun *lun;
 757
 758         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 759                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 760                         "-1: %u for Target Portal Group: %u\n",
 761                         tpg->se_tpg_tfo->get_fabric_name(),
 762                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 763                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 764                 return ERR_PTR(-EOVERFLOW);
 765         }
 766
 767         spin_lock(&tpg->tpg_lun_lock);
 768         lun = &tpg->tpg_lun_list[unpacked_lun];
 769         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 770                 pr_err("TPG Logical Unit Number: %u is already active"
 771                         " on %s Target Portal Group: %u, ignoring request.\n",
 772                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 773                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 774                 spin_unlock(&tpg->tpg_lun_lock);
 775                 return ERR_PTR(-EINVAL);
 776         }
 777         spin_unlock(&tpg->tpg_lun_lock);
 778
 779         return lun;
 780 }
 781
 782 int core_tpg_post_addlun(
 783         struct se_portal_group *tpg,
 784         struct se_lun *lun,
 785         u32 lun_access,
 786         void *lun_ptr)
 787 {
 788         int ret;
 789
 790         ret = core_dev_export(lun_ptr, tpg, lun);
 791         if (ret < 0)
 792                 return ret;
 793
 794         spin_lock(&tpg->tpg_lun_lock);
 795         lun->lun_access = lun_access;
 796         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 797         spin_unlock(&tpg->tpg_lun_lock);
 798
 799         return 0;
 800 }
 801
 802 static void core_tpg_shutdown_lun(
 803         struct se_portal_group *tpg,
 804         struct se_lun *lun)
 805 {
 806         core_clear_lun_from_tpg(lun, tpg);
 807         transport_clear_lun_from_sessions(lun);
 808 }
 809
 810 struct se_lun *core_tpg_pre_dellun(
 811         struct se_portal_group *tpg,
 812         u32 unpacked_lun)
 813 {
 814         struct se_lun *lun;
 815
 816         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 817                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 818                         "-1: %u for Target Portal Group: %u\n",
 819                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 820                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 821                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 822                 return ERR_PTR(-EOVERFLOW);
 823         }
 824
 825         spin_lock(&tpg->tpg_lun_lock);
 826         lun = &tpg->tpg_lun_list[unpacked_lun];
 827         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 828                 pr_err("%s Logical Unit Number: %u is not active on"
 829                         " Target Portal Group: %u, ignoring request.\n",
 830                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 831                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 832                 spin_unlock(&tpg->tpg_lun_lock);
 833                 return ERR_PTR(-ENODEV);
 834         }
 835         spin_unlock(&tpg->tpg_lun_lock);
 836
 837         return lun;
 838 }
 839
 840 int core_tpg_post_dellun(
 841         struct se_portal_group *tpg,
 842         struct se_lun *lun)
 843 {
 844         core_tpg_shutdown_lun(tpg, lun);
 845
 846         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 847
 848         spin_lock(&tpg->tpg_lun_lock);
 849         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 850         spin_unlock(&tpg->tpg_lun_lock);
 851
 852         return 0;
 853 }