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         kref_init(&acl->acl_kref);
 278         init_completion(&acl->acl_free_comp);
 279         spin_lock_init(&acl->device_list_lock);
 280         spin_lock_init(&acl->nacl_sess_lock);
 281         atomic_set(&acl->acl_pr_ref_count, 0);
 282         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 283         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 284         acl->se_tpg = tpg;
 285         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 286         spin_lock_init(&acl->stats_lock);
 287         acl->dynamic_node_acl = 1;
 288
 289         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 290
 291         if (core_create_device_list_for_node(acl) < 0) {
 292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                 return NULL;
 294         }
 295
 296         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 297                 core_free_device_list_for_node(acl, tpg);
 298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 299                 return NULL;
 300         }
 301         /*
 302          * Here we only create demo-mode MappedLUNs from the active
 303          * TPG LUNs if the fabric is not explictly asking for
 304          * tpg_check_demo_mode_login_only() == 1.
 305          */
 306         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 307             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 308                 do { ; } while (0);
 309         else
 310                 core_tpg_add_node_to_devs(acl, tpg);
 311
 312         spin_lock_irq(&tpg->acl_node_lock);
 313         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 314         tpg->num_node_acls++;
 315         spin_unlock_irq(&tpg->acl_node_lock);
 316
 317         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 318                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 319                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 320                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 321
 322         return acl;
 323 }
 324 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 325
 326 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 327 {
 328         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 329                 cpu_relax();
 330 }
 331
 332 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 333 {
 334         int i, ret;
 335         struct se_lun *lun;
 336
 337         spin_lock(&tpg->tpg_lun_lock);
 338         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 339                 lun = &tpg->tpg_lun_list[i];
 340
 341                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 342                     (lun->lun_se_dev == NULL))
 343                         continue;
 344
 345                 spin_unlock(&tpg->tpg_lun_lock);
 346                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 347                 spin_lock(&tpg->tpg_lun_lock);
 348         }
 349         spin_unlock(&tpg->tpg_lun_lock);
 350 }
 351 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 352
 353 /*      core_tpg_add_initiator_node_acl():
 354  *
 355  *
 356  */
 357 struct se_node_acl *core_tpg_add_initiator_node_acl(
 358         struct se_portal_group *tpg,
 359         struct se_node_acl *se_nacl,
 360         const char *initiatorname,
 361         u32 queue_depth)
 362 {
 363         struct se_node_acl *acl = NULL;
 364
 365         spin_lock_irq(&tpg->acl_node_lock);
 366         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 367         if (acl) {
 368                 if (acl->dynamic_node_acl) {
 369                         acl->dynamic_node_acl = 0;
 370                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 371                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 372                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 373                         spin_unlock_irq(&tpg->acl_node_lock);
 374                         /*
 375                          * Release the locally allocated struct se_node_acl
 376                          * because * core_tpg_add_initiator_node_acl() returned
 377                          * a pointer to an existing demo mode node ACL.
 378                          */
 379                         if (se_nacl)
 380                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 381                                                         se_nacl);
 382                         goto done;
 383                 }
 384
 385                 pr_err("ACL entry for %s Initiator"
 386                         " Node %s already exists for TPG %u, ignoring"
 387                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 388                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 389                 spin_unlock_irq(&tpg->acl_node_lock);
 390                 return ERR_PTR(-EEXIST);
 391         }
 392         spin_unlock_irq(&tpg->acl_node_lock);
 393
 394         if (!se_nacl) {
 395                 pr_err("struct se_node_acl pointer is NULL\n");
 396                 return ERR_PTR(-EINVAL);
 397         }
 398         /*
 399          * For v4.x logic the se_node_acl_s is hanging off a fabric
 400          * dependent structure allocated via
 401          * struct target_core_fabric_ops->fabric_make_nodeacl()
 402          */
 403         acl = se_nacl;
 404
 405         INIT_LIST_HEAD(&acl->acl_list);
 406         INIT_LIST_HEAD(&acl->acl_sess_list);
 407         kref_init(&acl->acl_kref);
 408         init_completion(&acl->acl_free_comp);
 409         spin_lock_init(&acl->device_list_lock);
 410         spin_lock_init(&acl->nacl_sess_lock);
 411         atomic_set(&acl->acl_pr_ref_count, 0);
 412         acl->queue_depth = queue_depth;
 413         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 414         acl->se_tpg = tpg;
 415         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 416         spin_lock_init(&acl->stats_lock);
 417
 418         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 419
 420         if (core_create_device_list_for_node(acl) < 0) {
 421                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 422                 return ERR_PTR(-ENOMEM);
 423         }
 424
 425         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 426                 core_free_device_list_for_node(acl, tpg);
 427                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 428                 return ERR_PTR(-EINVAL);
 429         }
 430
 431         spin_lock_irq(&tpg->acl_node_lock);
 432         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 433         tpg->num_node_acls++;
 434         spin_unlock_irq(&tpg->acl_node_lock);
 435
 436 done:
 437         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 438                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 439                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 440                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 441
 442         return acl;
 443 }
 444 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 445
 446 /*      core_tpg_del_initiator_node_acl():
 447  *
 448  *
 449  */
 450 int core_tpg_del_initiator_node_acl(
 451         struct se_portal_group *tpg,
 452         struct se_node_acl *acl,
 453         int force)
 454 {
 455         struct se_session *sess, *sess_tmp;
 456         unsigned long flags;
 457         int dynamic_acl = 0;
 458
 459         spin_lock_irq(&tpg->acl_node_lock);
 460         if (acl->dynamic_node_acl) {
 461                 acl->dynamic_node_acl = 0;
 462                 dynamic_acl = 1;
 463         }
 464         list_del(&acl->acl_list);
 465         tpg->num_node_acls--;
 466         spin_unlock_irq(&tpg->acl_node_lock);
 467
 468         spin_lock_irqsave(&tpg->session_lock, flags);
 469         list_for_each_entry_safe(sess, sess_tmp,
 470                                 &tpg->tpg_sess_list, sess_list) {
 471                 if (sess->se_node_acl != acl)
 472                         continue;
 473                 /*
 474                  * Determine if the session needs to be closed by our context.
 475                  */
 476                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 477                         continue;
 478
 479                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 480                 /*
 481                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 482                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 483                  */
 484                 tpg->se_tpg_tfo->close_session(sess);
 485
 486                 spin_lock_irqsave(&tpg->session_lock, flags);
 487         }
 488         spin_unlock_irqrestore(&tpg->session_lock, flags);
 489
 490         core_tpg_wait_for_nacl_pr_ref(acl);
 491         core_clear_initiator_node_from_tpg(acl, tpg);
 492         core_free_device_list_for_node(acl, tpg);
 493
 494         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 495                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 496                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 497                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 498
 499         return 0;
 500 }
 501 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 502
 503 /*      core_tpg_set_initiator_node_queue_depth():
 504  *
 505  *
 506  */
 507 int core_tpg_set_initiator_node_queue_depth(
 508         struct se_portal_group *tpg,
 509         unsigned char *initiatorname,
 510         u32 queue_depth,
 511         int force)
 512 {
 513         struct se_session *sess, *init_sess = NULL;
 514         struct se_node_acl *acl;
 515         unsigned long flags;
 516         int dynamic_acl = 0;
 517
 518         spin_lock_irq(&tpg->acl_node_lock);
 519         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 520         if (!acl) {
 521                 pr_err("Access Control List entry for %s Initiator"
 522                         " Node %s does not exists for TPG %hu, ignoring"
 523                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 524                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 525                 spin_unlock_irq(&tpg->acl_node_lock);
 526                 return -ENODEV;
 527         }
 528         if (acl->dynamic_node_acl) {
 529                 acl->dynamic_node_acl = 0;
 530                 dynamic_acl = 1;
 531         }
 532         spin_unlock_irq(&tpg->acl_node_lock);
 533
 534         spin_lock_irqsave(&tpg->session_lock, flags);
 535         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 536                 if (sess->se_node_acl != acl)
 537                         continue;
 538
 539                 if (!force) {
 540                         pr_err("Unable to change queue depth for %s"
 541                                 " Initiator Node: %s while session is"
 542                                 " operational.  To forcefully change the queue"
 543                                 " depth and force session reinstatement"
 544                                 " use the \"force=1\" parameter.\n",
 545                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 546                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 547
 548                         spin_lock_irq(&tpg->acl_node_lock);
 549                         if (dynamic_acl)
 550                                 acl->dynamic_node_acl = 1;
 551                         spin_unlock_irq(&tpg->acl_node_lock);
 552                         return -EEXIST;
 553                 }
 554                 /*
 555                  * Determine if the session needs to be closed by our context.
 556                  */
 557                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 558                         continue;
 559
 560                 init_sess = sess;
 561                 break;
 562         }
 563
 564         /*
 565          * User has requested to change the queue depth for a Initiator Node.
 566          * Change the value in the Node's struct se_node_acl, and call
 567          * core_set_queue_depth_for_node() to add the requested queue depth.
 568          *
 569          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 570          * reinstatement to occur if there is an active session for the
 571          * $FABRIC_MOD Initiator Node in question.
 572          */
 573         acl->queue_depth = queue_depth;
 574
 575         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 576                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 577                 /*
 578                  * Force session reinstatement if
 579                  * core_set_queue_depth_for_node() failed, because we assume
 580                  * the $FABRIC_MOD has already the set session reinstatement
 581                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 582                  */
 583                 if (init_sess)
 584                         tpg->se_tpg_tfo->close_session(init_sess);
 585
 586                 spin_lock_irq(&tpg->acl_node_lock);
 587                 if (dynamic_acl)
 588                         acl->dynamic_node_acl = 1;
 589                 spin_unlock_irq(&tpg->acl_node_lock);
 590                 return -EINVAL;
 591         }
 592         spin_unlock_irqrestore(&tpg->session_lock, flags);
 593         /*
 594          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 595          * forcefully shutdown the $FABRIC_MOD session/nexus.
 596          */
 597         if (init_sess)
 598                 tpg->se_tpg_tfo->close_session(init_sess);
 599
 600         pr_debug("Successfully changed queue depth to: %d for Initiator"
 601                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 602                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 603                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 604
 605         spin_lock_irq(&tpg->acl_node_lock);
 606         if (dynamic_acl)
 607                 acl->dynamic_node_acl = 1;
 608         spin_unlock_irq(&tpg->acl_node_lock);
 609
 610         return 0;
 611 }
 612 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 613
 614 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 615 {
 616         /* Set in core_dev_setup_virtual_lun0() */
 617         struct se_device *dev = g_lun0_dev;
 618         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 619         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 620         int ret;
 621
 622         lun->unpacked_lun = 0;
 623         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 624         atomic_set(&lun->lun_acl_count, 0);
 625         init_completion(&lun->lun_shutdown_comp);
 626         INIT_LIST_HEAD(&lun->lun_acl_list);
 627         INIT_LIST_HEAD(&lun->lun_cmd_list);
 628         spin_lock_init(&lun->lun_acl_lock);
 629         spin_lock_init(&lun->lun_cmd_lock);
 630         spin_lock_init(&lun->lun_sep_lock);
 631
 632         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 633         if (ret < 0)
 634                 return ret;
 635
 636         return 0;
 637 }
 638
 639 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 640 {
 641         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 642
 643         core_tpg_post_dellun(se_tpg, lun);
 644 }
 645
 646 int core_tpg_register(
 647         struct target_core_fabric_ops *tfo,
 648         struct se_wwn *se_wwn,
 649         struct se_portal_group *se_tpg,
 650         void *tpg_fabric_ptr,
 651         int se_tpg_type)
 652 {
 653         struct se_lun *lun;
 654         u32 i;
 655
 656         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 657                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 658         if (!se_tpg->tpg_lun_list) {
 659                 pr_err("Unable to allocate struct se_portal_group->"
 660                                 "tpg_lun_list\n");
 661                 return -ENOMEM;
 662         }
 663
 664         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 665                 lun = &se_tpg->tpg_lun_list[i];
 666                 lun->unpacked_lun = i;
 667                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 668                 atomic_set(&lun->lun_acl_count, 0);
 669                 init_completion(&lun->lun_shutdown_comp);
 670                 INIT_LIST_HEAD(&lun->lun_acl_list);
 671                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 672                 spin_lock_init(&lun->lun_acl_lock);
 673                 spin_lock_init(&lun->lun_cmd_lock);
 674                 spin_lock_init(&lun->lun_sep_lock);
 675         }
 676
 677         se_tpg->se_tpg_type = se_tpg_type;
 678         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 679         se_tpg->se_tpg_tfo = tfo;
 680         se_tpg->se_tpg_wwn = se_wwn;
 681         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 682         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 683         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 684         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 685         spin_lock_init(&se_tpg->acl_node_lock);
 686         spin_lock_init(&se_tpg->session_lock);
 687         spin_lock_init(&se_tpg->tpg_lun_lock);
 688
 689         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 690                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 691                         kfree(se_tpg);
 692                         return -ENOMEM;
 693                 }
 694         }
 695
 696         spin_lock_bh(&tpg_lock);
 697         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 698         spin_unlock_bh(&tpg_lock);
 699
 700         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 701                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 702                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 703                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 704                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 705
 706         return 0;
 707 }
 708 EXPORT_SYMBOL(core_tpg_register);
 709
 710 int core_tpg_deregister(struct se_portal_group *se_tpg)
 711 {
 712         struct se_node_acl *nacl, *nacl_tmp;
 713
 714         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 715                 " for endpoint: %s Portal Tag %u\n",
 716                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 717                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 718                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 719                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 720
 721         spin_lock_bh(&tpg_lock);
 722         list_del(&se_tpg->se_tpg_node);
 723         spin_unlock_bh(&tpg_lock);
 724
 725         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 726                 cpu_relax();
 727         /*
 728          * Release any remaining demo-mode generated se_node_acl that have
 729          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 730          * in transport_deregister_session().
 731          */
 732         spin_lock_irq(&se_tpg->acl_node_lock);
 733         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 734                         acl_list) {
 735                 list_del(&nacl->acl_list);
 736                 se_tpg->num_node_acls--;
 737                 spin_unlock_irq(&se_tpg->acl_node_lock);
 738
 739                 core_tpg_wait_for_nacl_pr_ref(nacl);
 740                 core_free_device_list_for_node(nacl, se_tpg);
 741                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 742
 743                 spin_lock_irq(&se_tpg->acl_node_lock);
 744         }
 745         spin_unlock_irq(&se_tpg->acl_node_lock);
 746
 747         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 748                 core_tpg_release_virtual_lun0(se_tpg);
 749
 750         se_tpg->se_tpg_fabric_ptr = NULL;
 751         kfree(se_tpg->tpg_lun_list);
 752         return 0;
 753 }
 754 EXPORT_SYMBOL(core_tpg_deregister);
 755
 756 struct se_lun *core_tpg_pre_addlun(
 757         struct se_portal_group *tpg,
 758         u32 unpacked_lun)
 759 {
 760         struct se_lun *lun;
 761
 762         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 763                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 764                         "-1: %u for Target Portal Group: %u\n",
 765                         tpg->se_tpg_tfo->get_fabric_name(),
 766                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 767                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 768                 return ERR_PTR(-EOVERFLOW);
 769         }
 770
 771         spin_lock(&tpg->tpg_lun_lock);
 772         lun = &tpg->tpg_lun_list[unpacked_lun];
 773         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 774                 pr_err("TPG Logical Unit Number: %u is already active"
 775                         " on %s Target Portal Group: %u, ignoring request.\n",
 776                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 777                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 778                 spin_unlock(&tpg->tpg_lun_lock);
 779                 return ERR_PTR(-EINVAL);
 780         }
 781         spin_unlock(&tpg->tpg_lun_lock);
 782
 783         return lun;
 784 }
 785
 786 int core_tpg_post_addlun(
 787         struct se_portal_group *tpg,
 788         struct se_lun *lun,
 789         u32 lun_access,
 790         void *lun_ptr)
 791 {
 792         int ret;
 793
 794         ret = core_dev_export(lun_ptr, tpg, lun);
 795         if (ret < 0)
 796                 return ret;
 797
 798         spin_lock(&tpg->tpg_lun_lock);
 799         lun->lun_access = lun_access;
 800         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 801         spin_unlock(&tpg->tpg_lun_lock);
 802
 803         return 0;
 804 }
 805
 806 static void core_tpg_shutdown_lun(
 807         struct se_portal_group *tpg,
 808         struct se_lun *lun)
 809 {
 810         core_clear_lun_from_tpg(lun, tpg);
 811         transport_clear_lun_from_sessions(lun);
 812 }
 813
 814 struct se_lun *core_tpg_pre_dellun(
 815         struct se_portal_group *tpg,
 816         u32 unpacked_lun)
 817 {
 818         struct se_lun *lun;
 819
 820         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 821                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 822                         "-1: %u for Target Portal Group: %u\n",
 823                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 824                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 825                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 826                 return ERR_PTR(-EOVERFLOW);
 827         }
 828
 829         spin_lock(&tpg->tpg_lun_lock);
 830         lun = &tpg->tpg_lun_list[unpacked_lun];
 831         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 832                 pr_err("%s Logical Unit Number: %u is not active on"
 833                         " Target Portal Group: %u, ignoring request.\n",
 834                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 835                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 836                 spin_unlock(&tpg->tpg_lun_lock);
 837                 return ERR_PTR(-ENODEV);
 838         }
 839         spin_unlock(&tpg->tpg_lun_lock);
 840
 841         return lun;
 842 }
 843
 844 int core_tpg_post_dellun(
 845         struct se_portal_group *tpg,
 846         struct se_lun *lun)
 847 {
 848         core_tpg_shutdown_lun(tpg, lun);
 849
 850         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 851
 852         spin_lock(&tpg->tpg_lun_lock);
 853         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 854         spin_unlock(&tpg->tpg_lun_lock);
 855
 856         return 0;
 857 }