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 <net/sock.h>
  36 #include <net/tcp.h>
  37 #include <scsi/scsi.h>
  38 #include <scsi/scsi_cmnd.h>
  39
  40 #include <target/target_core_base.h>
  41 #include <target/target_core_device.h>
  42 #include <target/target_core_tpg.h>
  43 #include <target/target_core_transport.h>
  44 #include <target/target_core_fabric_ops.h>
  45
  46 #include "target_core_hba.h"
  47 #include "target_core_stat.h"
  48
  49 extern struct se_device *g_lun0_dev;
  50
  51 static DEFINE_SPINLOCK(tpg_lock);
  52 static LIST_HEAD(tpg_list);
  53
  54 /*      core_clear_initiator_node_from_tpg():
  55  *
  56  *
  57  */
  58 static void core_clear_initiator_node_from_tpg(
  59         struct se_node_acl *nacl,
  60         struct se_portal_group *tpg)
  61 {
  62         int i;
  63         struct se_dev_entry *deve;
  64         struct se_lun *lun;
  65         struct se_lun_acl *acl, *acl_tmp;
  66
  67         spin_lock_irq(&nacl->device_list_lock);
  68         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  69                 deve = &nacl->device_list[i];
  70
  71                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  72                         continue;
  73
  74                 if (!deve->se_lun) {
  75                         pr_err("%s device entries device pointer is"
  76                                 " NULL, but Initiator has access.\n",
  77                                 tpg->se_tpg_tfo->get_fabric_name());
  78                         continue;
  79                 }
  80
  81                 lun = deve->se_lun;
  82                 spin_unlock_irq(&nacl->device_list_lock);
  83                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  84                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  85
  86                 spin_lock(&lun->lun_acl_lock);
  87                 list_for_each_entry_safe(acl, acl_tmp,
  88                                         &lun->lun_acl_list, lacl_list) {
  89                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
  90                             (acl->mapped_lun == deve->mapped_lun))
  91                                 break;
  92                 }
  93
  94                 if (!acl) {
  95                         pr_err("Unable to locate struct se_lun_acl for %s,"
  96                                 " mapped_lun: %u\n", nacl->initiatorname,
  97                                 deve->mapped_lun);
  98                         spin_unlock(&lun->lun_acl_lock);
  99                         spin_lock_irq(&nacl->device_list_lock);
 100                         continue;
 101                 }
 102
 103                 list_del(&acl->lacl_list);
 104                 spin_unlock(&lun->lun_acl_lock);
 105
 106                 spin_lock_irq(&nacl->device_list_lock);
 107                 kfree(acl);
 108         }
 109         spin_unlock_irq(&nacl->device_list_lock);
 110 }
 111
 112 /*      __core_tpg_get_initiator_node_acl():
 113  *
 114  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 115  */
 116 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 117         struct se_portal_group *tpg,
 118         const char *initiatorname)
 119 {
 120         struct se_node_acl *acl;
 121
 122         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 123                 if (!strcmp(acl->initiatorname, initiatorname))
 124                         return acl;
 125         }
 126
 127         return NULL;
 128 }
 129
 130 /*      core_tpg_get_initiator_node_acl():
 131  *
 132  *
 133  */
 134 struct se_node_acl *core_tpg_get_initiator_node_acl(
 135         struct se_portal_group *tpg,
 136         unsigned char *initiatorname)
 137 {
 138         struct se_node_acl *acl;
 139
 140         spin_lock_bh(&tpg->acl_node_lock);
 141         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 142                 if (!strcmp(acl->initiatorname, initiatorname) &&
 143                     !acl->dynamic_node_acl) {
 144                         spin_unlock_bh(&tpg->acl_node_lock);
 145                         return acl;
 146                 }
 147         }
 148         spin_unlock_bh(&tpg->acl_node_lock);
 149
 150         return NULL;
 151 }
 152
 153 /*      core_tpg_add_node_to_devs():
 154  *
 155  *
 156  */
 157 void core_tpg_add_node_to_devs(
 158         struct se_node_acl *acl,
 159         struct se_portal_group *tpg)
 160 {
 161         int i = 0;
 162         u32 lun_access = 0;
 163         struct se_lun *lun;
 164         struct se_device *dev;
 165
 166         spin_lock(&tpg->tpg_lun_lock);
 167         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 168                 lun = &tpg->tpg_lun_list[i];
 169                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 170                         continue;
 171
 172                 spin_unlock(&tpg->tpg_lun_lock);
 173
 174                 dev = lun->lun_se_dev;
 175                 /*
 176                  * By default in LIO-Target $FABRIC_MOD,
 177                  * demo_mode_write_protect is ON, or READ_ONLY;
 178                  */
 179                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 180                         if (dev->dev_flags & DF_READ_ONLY)
 181                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 182                         else
 183                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 184                 } else {
 185                         /*
 186                          * Allow only optical drives to issue R/W in default RO
 187                          * demo mode.
 188                          */
 189                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 190                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 191                         else
 192                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 193                 }
 194
 195                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 196                         " access for LUN in Demo Mode\n",
 197                         tpg->se_tpg_tfo->get_fabric_name(),
 198                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 199                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 200                         "READ-WRITE" : "READ-ONLY");
 201
 202                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 203                                 lun_access, acl, tpg, 1);
 204                 spin_lock(&tpg->tpg_lun_lock);
 205         }
 206         spin_unlock(&tpg->tpg_lun_lock);
 207 }
 208
 209 /*      core_set_queue_depth_for_node():
 210  *
 211  *
 212  */
 213 static int core_set_queue_depth_for_node(
 214         struct se_portal_group *tpg,
 215         struct se_node_acl *acl)
 216 {
 217         if (!acl->queue_depth) {
 218                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 219                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 220                         acl->initiatorname);
 221                 acl->queue_depth = 1;
 222         }
 223
 224         return 0;
 225 }
 226
 227 /*      core_create_device_list_for_node():
 228  *
 229  *
 230  */
 231 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 232 {
 233         struct se_dev_entry *deve;
 234         int i;
 235
 236         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
 237                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
 238         if (!nacl->device_list) {
 239                 pr_err("Unable to allocate memory for"
 240                         " struct se_node_acl->device_list\n");
 241                 return -ENOMEM;
 242         }
 243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 244                 deve = &nacl->device_list[i];
 245
 246                 atomic_set(&deve->ua_count, 0);
 247                 atomic_set(&deve->pr_ref_count, 0);
 248                 spin_lock_init(&deve->ua_lock);
 249                 INIT_LIST_HEAD(&deve->alua_port_list);
 250                 INIT_LIST_HEAD(&deve->ua_list);
 251         }
 252
 253         return 0;
 254 }
 255
 256 /*      core_tpg_check_initiator_node_acl()
 257  *
 258  *
 259  */
 260 struct se_node_acl *core_tpg_check_initiator_node_acl(
 261         struct se_portal_group *tpg,
 262         unsigned char *initiatorname)
 263 {
 264         struct se_node_acl *acl;
 265
 266         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 267         if (acl)
 268                 return acl;
 269
 270         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 271                 return NULL;
 272
 273         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 274         if (!acl)
 275                 return NULL;
 276
 277         INIT_LIST_HEAD(&acl->acl_list);
 278         INIT_LIST_HEAD(&acl->acl_sess_list);
 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         core_tpg_add_node_to_devs(acl, tpg);
 303
 304         spin_lock_bh(&tpg->acl_node_lock);
 305         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 306         tpg->num_node_acls++;
 307         spin_unlock_bh(&tpg->acl_node_lock);
 308
 309         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 310                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 311                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 312                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 313
 314         return acl;
 315 }
 316 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 317
 318 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 319 {
 320         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 321                 cpu_relax();
 322 }
 323
 324 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 325 {
 326         int i, ret;
 327         struct se_lun *lun;
 328
 329         spin_lock(&tpg->tpg_lun_lock);
 330         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 331                 lun = &tpg->tpg_lun_list[i];
 332
 333                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 334                     (lun->lun_se_dev == NULL))
 335                         continue;
 336
 337                 spin_unlock(&tpg->tpg_lun_lock);
 338                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 339                 spin_lock(&tpg->tpg_lun_lock);
 340         }
 341         spin_unlock(&tpg->tpg_lun_lock);
 342 }
 343 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 344
 345 /*      core_tpg_add_initiator_node_acl():
 346  *
 347  *
 348  */
 349 struct se_node_acl *core_tpg_add_initiator_node_acl(
 350         struct se_portal_group *tpg,
 351         struct se_node_acl *se_nacl,
 352         const char *initiatorname,
 353         u32 queue_depth)
 354 {
 355         struct se_node_acl *acl = NULL;
 356
 357         spin_lock_bh(&tpg->acl_node_lock);
 358         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 359         if (acl) {
 360                 if (acl->dynamic_node_acl) {
 361                         acl->dynamic_node_acl = 0;
 362                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 363                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 364                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 365                         spin_unlock_bh(&tpg->acl_node_lock);
 366                         /*
 367                          * Release the locally allocated struct se_node_acl
 368                          * because * core_tpg_add_initiator_node_acl() returned
 369                          * a pointer to an existing demo mode node ACL.
 370                          */
 371                         if (se_nacl)
 372                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 373                                                         se_nacl);
 374                         goto done;
 375                 }
 376
 377                 pr_err("ACL entry for %s Initiator"
 378                         " Node %s already exists for TPG %u, ignoring"
 379                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 380                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 381                 spin_unlock_bh(&tpg->acl_node_lock);
 382                 return ERR_PTR(-EEXIST);
 383         }
 384         spin_unlock_bh(&tpg->acl_node_lock);
 385
 386         if (!se_nacl) {
 387                 pr_err("struct se_node_acl pointer is NULL\n");
 388                 return ERR_PTR(-EINVAL);
 389         }
 390         /*
 391          * For v4.x logic the se_node_acl_s is hanging off a fabric
 392          * dependent structure allocated via
 393          * struct target_core_fabric_ops->fabric_make_nodeacl()
 394          */
 395         acl = se_nacl;
 396
 397         INIT_LIST_HEAD(&acl->acl_list);
 398         INIT_LIST_HEAD(&acl->acl_sess_list);
 399         spin_lock_init(&acl->device_list_lock);
 400         spin_lock_init(&acl->nacl_sess_lock);
 401         atomic_set(&acl->acl_pr_ref_count, 0);
 402         acl->queue_depth = queue_depth;
 403         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 404         acl->se_tpg = tpg;
 405         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 406         spin_lock_init(&acl->stats_lock);
 407
 408         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 409
 410         if (core_create_device_list_for_node(acl) < 0) {
 411                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 412                 return ERR_PTR(-ENOMEM);
 413         }
 414
 415         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 416                 core_free_device_list_for_node(acl, tpg);
 417                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 418                 return ERR_PTR(-EINVAL);
 419         }
 420
 421         spin_lock_bh(&tpg->acl_node_lock);
 422         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 423         tpg->num_node_acls++;
 424         spin_unlock_bh(&tpg->acl_node_lock);
 425
 426 done:
 427         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 428                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 429                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 430                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 431
 432         return acl;
 433 }
 434 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 435
 436 /*      core_tpg_del_initiator_node_acl():
 437  *
 438  *
 439  */
 440 int core_tpg_del_initiator_node_acl(
 441         struct se_portal_group *tpg,
 442         struct se_node_acl *acl,
 443         int force)
 444 {
 445         struct se_session *sess, *sess_tmp;
 446         int dynamic_acl = 0;
 447
 448         spin_lock_bh(&tpg->acl_node_lock);
 449         if (acl->dynamic_node_acl) {
 450                 acl->dynamic_node_acl = 0;
 451                 dynamic_acl = 1;
 452         }
 453         list_del(&acl->acl_list);
 454         tpg->num_node_acls--;
 455         spin_unlock_bh(&tpg->acl_node_lock);
 456
 457         spin_lock_bh(&tpg->session_lock);
 458         list_for_each_entry_safe(sess, sess_tmp,
 459                                 &tpg->tpg_sess_list, sess_list) {
 460                 if (sess->se_node_acl != acl)
 461                         continue;
 462                 /*
 463                  * Determine if the session needs to be closed by our context.
 464                  */
 465                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 466                         continue;
 467
 468                 spin_unlock_bh(&tpg->session_lock);
 469                 /*
 470                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 471                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 472                  */
 473                 tpg->se_tpg_tfo->close_session(sess);
 474
 475                 spin_lock_bh(&tpg->session_lock);
 476         }
 477         spin_unlock_bh(&tpg->session_lock);
 478
 479         core_tpg_wait_for_nacl_pr_ref(acl);
 480         core_clear_initiator_node_from_tpg(acl, tpg);
 481         core_free_device_list_for_node(acl, tpg);
 482
 483         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 484                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 485                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 486                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 487
 488         return 0;
 489 }
 490 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 491
 492 /*      core_tpg_set_initiator_node_queue_depth():
 493  *
 494  *
 495  */
 496 int core_tpg_set_initiator_node_queue_depth(
 497         struct se_portal_group *tpg,
 498         unsigned char *initiatorname,
 499         u32 queue_depth,
 500         int force)
 501 {
 502         struct se_session *sess, *init_sess = NULL;
 503         struct se_node_acl *acl;
 504         int dynamic_acl = 0;
 505
 506         spin_lock_bh(&tpg->acl_node_lock);
 507         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 508         if (!acl) {
 509                 pr_err("Access Control List entry for %s Initiator"
 510                         " Node %s does not exists for TPG %hu, ignoring"
 511                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 512                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 513                 spin_unlock_bh(&tpg->acl_node_lock);
 514                 return -ENODEV;
 515         }
 516         if (acl->dynamic_node_acl) {
 517                 acl->dynamic_node_acl = 0;
 518                 dynamic_acl = 1;
 519         }
 520         spin_unlock_bh(&tpg->acl_node_lock);
 521
 522         spin_lock_bh(&tpg->session_lock);
 523         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 524                 if (sess->se_node_acl != acl)
 525                         continue;
 526
 527                 if (!force) {
 528                         pr_err("Unable to change queue depth for %s"
 529                                 " Initiator Node: %s while session is"
 530                                 " operational.  To forcefully change the queue"
 531                                 " depth and force session reinstatement"
 532                                 " use the \"force=1\" parameter.\n",
 533                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 534                         spin_unlock_bh(&tpg->session_lock);
 535
 536                         spin_lock_bh(&tpg->acl_node_lock);
 537                         if (dynamic_acl)
 538                                 acl->dynamic_node_acl = 1;
 539                         spin_unlock_bh(&tpg->acl_node_lock);
 540                         return -EEXIST;
 541                 }
 542                 /*
 543                  * Determine if the session needs to be closed by our context.
 544                  */
 545                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 546                         continue;
 547
 548                 init_sess = sess;
 549                 break;
 550         }
 551
 552         /*
 553          * User has requested to change the queue depth for a Initiator Node.
 554          * Change the value in the Node's struct se_node_acl, and call
 555          * core_set_queue_depth_for_node() to add the requested queue depth.
 556          *
 557          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 558          * reinstatement to occur if there is an active session for the
 559          * $FABRIC_MOD Initiator Node in question.
 560          */
 561         acl->queue_depth = queue_depth;
 562
 563         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 564                 spin_unlock_bh(&tpg->session_lock);
 565                 /*
 566                  * Force session reinstatement if
 567                  * core_set_queue_depth_for_node() failed, because we assume
 568                  * the $FABRIC_MOD has already the set session reinstatement
 569                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 570                  */
 571                 if (init_sess)
 572                         tpg->se_tpg_tfo->close_session(init_sess);
 573
 574                 spin_lock_bh(&tpg->acl_node_lock);
 575                 if (dynamic_acl)
 576                         acl->dynamic_node_acl = 1;
 577                 spin_unlock_bh(&tpg->acl_node_lock);
 578                 return -EINVAL;
 579         }
 580         spin_unlock_bh(&tpg->session_lock);
 581         /*
 582          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 583          * forcefully shutdown the $FABRIC_MOD session/nexus.
 584          */
 585         if (init_sess)
 586                 tpg->se_tpg_tfo->close_session(init_sess);
 587
 588         pr_debug("Successfuly changed queue depth to: %d for Initiator"
 589                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 590                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 591                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 592
 593         spin_lock_bh(&tpg->acl_node_lock);
 594         if (dynamic_acl)
 595                 acl->dynamic_node_acl = 1;
 596         spin_unlock_bh(&tpg->acl_node_lock);
 597
 598         return 0;
 599 }
 600 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 601
 602 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 603 {
 604         /* Set in core_dev_setup_virtual_lun0() */
 605         struct se_device *dev = g_lun0_dev;
 606         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 607         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 608         int ret;
 609
 610         lun->unpacked_lun = 0;
 611         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 612         atomic_set(&lun->lun_acl_count, 0);
 613         init_completion(&lun->lun_shutdown_comp);
 614         INIT_LIST_HEAD(&lun->lun_acl_list);
 615         INIT_LIST_HEAD(&lun->lun_cmd_list);
 616         spin_lock_init(&lun->lun_acl_lock);
 617         spin_lock_init(&lun->lun_cmd_lock);
 618         spin_lock_init(&lun->lun_sep_lock);
 619
 620         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 621         if (ret < 0)
 622                 return ret;
 623
 624         return 0;
 625 }
 626
 627 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 628 {
 629         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 630
 631         core_tpg_post_dellun(se_tpg, lun);
 632 }
 633
 634 int core_tpg_register(
 635         struct target_core_fabric_ops *tfo,
 636         struct se_wwn *se_wwn,
 637         struct se_portal_group *se_tpg,
 638         void *tpg_fabric_ptr,
 639         int se_tpg_type)
 640 {
 641         struct se_lun *lun;
 642         u32 i;
 643
 644         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 645                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 646         if (!se_tpg->tpg_lun_list) {
 647                 pr_err("Unable to allocate struct se_portal_group->"
 648                                 "tpg_lun_list\n");
 649                 return -ENOMEM;
 650         }
 651
 652         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 653                 lun = &se_tpg->tpg_lun_list[i];
 654                 lun->unpacked_lun = i;
 655                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 656                 atomic_set(&lun->lun_acl_count, 0);
 657                 init_completion(&lun->lun_shutdown_comp);
 658                 INIT_LIST_HEAD(&lun->lun_acl_list);
 659                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 660                 spin_lock_init(&lun->lun_acl_lock);
 661                 spin_lock_init(&lun->lun_cmd_lock);
 662                 spin_lock_init(&lun->lun_sep_lock);
 663         }
 664
 665         se_tpg->se_tpg_type = se_tpg_type;
 666         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 667         se_tpg->se_tpg_tfo = tfo;
 668         se_tpg->se_tpg_wwn = se_wwn;
 669         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 670         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 671         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 672         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 673         spin_lock_init(&se_tpg->acl_node_lock);
 674         spin_lock_init(&se_tpg->session_lock);
 675         spin_lock_init(&se_tpg->tpg_lun_lock);
 676
 677         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 678                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 679                         kfree(se_tpg);
 680                         return -ENOMEM;
 681                 }
 682         }
 683
 684         spin_lock_bh(&tpg_lock);
 685         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 686         spin_unlock_bh(&tpg_lock);
 687
 688         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 689                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 690                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 691                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 692                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 693
 694         return 0;
 695 }
 696 EXPORT_SYMBOL(core_tpg_register);
 697
 698 int core_tpg_deregister(struct se_portal_group *se_tpg)
 699 {
 700         struct se_node_acl *nacl, *nacl_tmp;
 701
 702         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 703                 " for endpoint: %s Portal Tag %u\n",
 704                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 705                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 706                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 707                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 708
 709         spin_lock_bh(&tpg_lock);
 710         list_del(&se_tpg->se_tpg_node);
 711         spin_unlock_bh(&tpg_lock);
 712
 713         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 714                 cpu_relax();
 715         /*
 716          * Release any remaining demo-mode generated se_node_acl that have
 717          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 718          * in transport_deregister_session().
 719          */
 720         spin_lock_bh(&se_tpg->acl_node_lock);
 721         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 722                         acl_list) {
 723                 list_del(&nacl->acl_list);
 724                 se_tpg->num_node_acls--;
 725                 spin_unlock_bh(&se_tpg->acl_node_lock);
 726
 727                 core_tpg_wait_for_nacl_pr_ref(nacl);
 728                 core_free_device_list_for_node(nacl, se_tpg);
 729                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 730
 731                 spin_lock_bh(&se_tpg->acl_node_lock);
 732         }
 733         spin_unlock_bh(&se_tpg->acl_node_lock);
 734
 735         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 736                 core_tpg_release_virtual_lun0(se_tpg);
 737
 738         se_tpg->se_tpg_fabric_ptr = NULL;
 739         kfree(se_tpg->tpg_lun_list);
 740         return 0;
 741 }
 742 EXPORT_SYMBOL(core_tpg_deregister);
 743
 744 struct se_lun *core_tpg_pre_addlun(
 745         struct se_portal_group *tpg,
 746         u32 unpacked_lun)
 747 {
 748         struct se_lun *lun;
 749
 750         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 751                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 752                         "-1: %u for Target Portal Group: %u\n",
 753                         tpg->se_tpg_tfo->get_fabric_name(),
 754                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 755                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 756                 return ERR_PTR(-EOVERFLOW);
 757         }
 758
 759         spin_lock(&tpg->tpg_lun_lock);
 760         lun = &tpg->tpg_lun_list[unpacked_lun];
 761         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 762                 pr_err("TPG Logical Unit Number: %u is already active"
 763                         " on %s Target Portal Group: %u, ignoring request.\n",
 764                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 765                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 766                 spin_unlock(&tpg->tpg_lun_lock);
 767                 return ERR_PTR(-EINVAL);
 768         }
 769         spin_unlock(&tpg->tpg_lun_lock);
 770
 771         return lun;
 772 }
 773
 774 int core_tpg_post_addlun(
 775         struct se_portal_group *tpg,
 776         struct se_lun *lun,
 777         u32 lun_access,
 778         void *lun_ptr)
 779 {
 780         int ret;
 781
 782         ret = core_dev_export(lun_ptr, tpg, lun);
 783         if (ret < 0)
 784                 return ret;
 785
 786         spin_lock(&tpg->tpg_lun_lock);
 787         lun->lun_access = lun_access;
 788         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 789         spin_unlock(&tpg->tpg_lun_lock);
 790
 791         return 0;
 792 }
 793
 794 static void core_tpg_shutdown_lun(
 795         struct se_portal_group *tpg,
 796         struct se_lun *lun)
 797 {
 798         core_clear_lun_from_tpg(lun, tpg);
 799         transport_clear_lun_from_sessions(lun);
 800 }
 801
 802 struct se_lun *core_tpg_pre_dellun(
 803         struct se_portal_group *tpg,
 804         u32 unpacked_lun,
 805         int *ret)
 806 {
 807         struct se_lun *lun;
 808
 809         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 810                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 811                         "-1: %u for Target Portal Group: %u\n",
 812                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 813                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 814                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 815                 return ERR_PTR(-EOVERFLOW);
 816         }
 817
 818         spin_lock(&tpg->tpg_lun_lock);
 819         lun = &tpg->tpg_lun_list[unpacked_lun];
 820         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 821                 pr_err("%s Logical Unit Number: %u is not active on"
 822                         " Target Portal Group: %u, ignoring request.\n",
 823                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 824                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 825                 spin_unlock(&tpg->tpg_lun_lock);
 826                 return ERR_PTR(-ENODEV);
 827         }
 828         spin_unlock(&tpg->tpg_lun_lock);
 829
 830         return lun;
 831 }
 832
 833 int core_tpg_post_dellun(
 834         struct se_portal_group *tpg,
 835         struct se_lun *lun)
 836 {
 837         core_tpg_shutdown_lun(tpg, lun);
 838
 839         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 840
 841         spin_lock(&tpg->tpg_lun_lock);
 842         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 843         spin_unlock(&tpg->tpg_lun_lock);
 844
 845         return 0;
 846 }