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  * (c) Copyright 2002-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/net.h>
  27 #include <linux/string.h>
  28 #include <linux/timer.h>
  29 #include <linux/slab.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/in.h>
  32 #include <linux/export.h>
  33 #include <net/sock.h>
  34 #include <net/tcp.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_cmnd.h>
  37
  38 #include <target/target_core_base.h>
  39 #include <target/target_core_backend.h>
  40 #include <target/target_core_fabric.h>
  41
  42 #include "target_core_internal.h"
  43
  44 extern struct se_device *g_lun0_dev;
  45
  46 static DEFINE_SPINLOCK(tpg_lock);
  47 static LIST_HEAD(tpg_list);
  48
  49 /*      core_clear_initiator_node_from_tpg():
  50  *
  51  *
  52  */
  53 static void core_clear_initiator_node_from_tpg(
  54         struct se_node_acl *nacl,
  55         struct se_portal_group *tpg)
  56 {
  57         int i;
  58         struct se_dev_entry *deve;
  59         struct se_lun *lun;
  60
  61         spin_lock_irq(&nacl->device_list_lock);
  62         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  63                 deve = nacl->device_list[i];
  64
  65                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  66                         continue;
  67
  68                 if (!deve->se_lun) {
  69                         pr_err("%s device entries device pointer is"
  70                                 " NULL, but Initiator has access.\n",
  71                                 tpg->se_tpg_tfo->get_fabric_name());
  72                         continue;
  73                 }
  74
  75                 lun = deve->se_lun;
  76                 spin_unlock_irq(&nacl->device_list_lock);
  77                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
  78                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
  79
  80                 spin_lock_irq(&nacl->device_list_lock);
  81         }
  82         spin_unlock_irq(&nacl->device_list_lock);
  83 }
  84
  85 /*      __core_tpg_get_initiator_node_acl():
  86  *
  87  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  88  */
  89 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  90         struct se_portal_group *tpg,
  91         const char *initiatorname)
  92 {
  93         struct se_node_acl *acl;
  94
  95         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  96                 if (!strcmp(acl->initiatorname, initiatorname))
  97                         return acl;
  98         }
  99
 100         return NULL;
 101 }
 102
 103 /*      core_tpg_get_initiator_node_acl():
 104  *
 105  *
 106  */
 107 struct se_node_acl *core_tpg_get_initiator_node_acl(
 108         struct se_portal_group *tpg,
 109         unsigned char *initiatorname)
 110 {
 111         struct se_node_acl *acl;
 112
 113         spin_lock_irq(&tpg->acl_node_lock);
 114         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 115         spin_unlock_irq(&tpg->acl_node_lock);
 116
 117         return acl;
 118 }
 119 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
 120
 121 /*      core_tpg_add_node_to_devs():
 122  *
 123  *
 124  */
 125 void core_tpg_add_node_to_devs(
 126         struct se_node_acl *acl,
 127         struct se_portal_group *tpg)
 128 {
 129         int i = 0;
 130         u32 lun_access = 0;
 131         struct se_lun *lun;
 132         struct se_device *dev;
 133
 134         spin_lock(&tpg->tpg_lun_lock);
 135         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 136                 lun = tpg->tpg_lun_list[i];
 137                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 138                         continue;
 139
 140                 spin_unlock(&tpg->tpg_lun_lock);
 141
 142                 dev = lun->lun_se_dev;
 143                 /*
 144                  * By default in LIO-Target $FABRIC_MOD,
 145                  * demo_mode_write_protect is ON, or READ_ONLY;
 146                  */
 147                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 148                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 149                 } else {
 150                         /*
 151                          * Allow only optical drives to issue R/W in default RO
 152                          * demo mode.
 153                          */
 154                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 155                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 156                         else
 157                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 158                 }
 159
 160                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 161                         " access for LUN in Demo Mode\n",
 162                         tpg->se_tpg_tfo->get_fabric_name(),
 163                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 164                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 165                         "READ-WRITE" : "READ-ONLY");
 166
 167                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 168                                 lun_access, acl, tpg);
 169                 spin_lock(&tpg->tpg_lun_lock);
 170         }
 171         spin_unlock(&tpg->tpg_lun_lock);
 172 }
 173
 174 /*      core_set_queue_depth_for_node():
 175  *
 176  *
 177  */
 178 static int core_set_queue_depth_for_node(
 179         struct se_portal_group *tpg,
 180         struct se_node_acl *acl)
 181 {
 182         if (!acl->queue_depth) {
 183                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 184                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 185                         acl->initiatorname);
 186                 acl->queue_depth = 1;
 187         }
 188
 189         return 0;
 190 }
 191
 192 void array_free(void *array, int n)
 193 {
 194         void **a = array;
 195         int i;
 196
 197         for (i = 0; i < n; i++)
 198                 kfree(a[i]);
 199         kfree(a);
 200 }
 201
 202 static void *array_zalloc(int n, size_t size, gfp_t flags)
 203 {
 204         void **a;
 205         int i;
 206
 207         a = kzalloc(n * sizeof(void*), flags);
 208         if (!a)
 209                 return NULL;
 210         for (i = 0; i < n; i++) {
 211                 a[i] = kzalloc(size, flags);
 212                 if (!a[i]) {
 213                         array_free(a, n);
 214                         return NULL;
 215                 }
 216         }
 217         return a;
 218 }
 219
 220 /*      core_create_device_list_for_node():
 221  *
 222  *
 223  */
 224 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 225 {
 226         struct se_dev_entry *deve;
 227         int i;
 228
 229         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 230                         sizeof(struct se_dev_entry), GFP_KERNEL);
 231         if (!nacl->device_list) {
 232                 pr_err("Unable to allocate memory for"
 233                         " struct se_node_acl->device_list\n");
 234                 return -ENOMEM;
 235         }
 236         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 237                 deve = nacl->device_list[i];
 238
 239                 atomic_set(&deve->ua_count, 0);
 240                 atomic_set(&deve->pr_ref_count, 0);
 241                 spin_lock_init(&deve->ua_lock);
 242                 INIT_LIST_HEAD(&deve->alua_port_list);
 243                 INIT_LIST_HEAD(&deve->ua_list);
 244         }
 245
 246         return 0;
 247 }
 248
 249 /*      core_tpg_check_initiator_node_acl()
 250  *
 251  *
 252  */
 253 struct se_node_acl *core_tpg_check_initiator_node_acl(
 254         struct se_portal_group *tpg,
 255         unsigned char *initiatorname)
 256 {
 257         struct se_node_acl *acl;
 258
 259         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 260         if (acl)
 261                 return acl;
 262
 263         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 264                 return NULL;
 265
 266         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 267         if (!acl)
 268                 return NULL;
 269
 270         INIT_LIST_HEAD(&acl->acl_list);
 271         INIT_LIST_HEAD(&acl->acl_sess_list);
 272         kref_init(&acl->acl_kref);
 273         init_completion(&acl->acl_free_comp);
 274         spin_lock_init(&acl->device_list_lock);
 275         spin_lock_init(&acl->nacl_sess_lock);
 276         atomic_set(&acl->acl_pr_ref_count, 0);
 277         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 278         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 279         acl->se_tpg = tpg;
 280         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 281         acl->dynamic_node_acl = 1;
 282
 283         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 284
 285         if (core_create_device_list_for_node(acl) < 0) {
 286                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 287                 return NULL;
 288         }
 289
 290         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 291                 core_free_device_list_for_node(acl, tpg);
 292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                 return NULL;
 294         }
 295         /*
 296          * Here we only create demo-mode MappedLUNs from the active
 297          * TPG LUNs if the fabric is not explicitly asking for
 298          * tpg_check_demo_mode_login_only() == 1.
 299          */
 300         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 301             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 302                 core_tpg_add_node_to_devs(acl, tpg);
 303
 304         spin_lock_irq(&tpg->acl_node_lock);
 305         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 306         tpg->num_node_acls++;
 307         spin_unlock_irq(&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;
 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                 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_irq(&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_irq(&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_irq(&tpg->acl_node_lock);
 382                 return ERR_PTR(-EEXIST);
 383         }
 384         spin_unlock_irq(&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         kref_init(&acl->acl_kref);
 400         init_completion(&acl->acl_free_comp);
 401         spin_lock_init(&acl->device_list_lock);
 402         spin_lock_init(&acl->nacl_sess_lock);
 403         atomic_set(&acl->acl_pr_ref_count, 0);
 404         acl->queue_depth = queue_depth;
 405         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 406         acl->se_tpg = tpg;
 407         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 408
 409         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 410
 411         if (core_create_device_list_for_node(acl) < 0) {
 412                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 413                 return ERR_PTR(-ENOMEM);
 414         }
 415
 416         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 417                 core_free_device_list_for_node(acl, tpg);
 418                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 419                 return ERR_PTR(-EINVAL);
 420         }
 421
 422         spin_lock_irq(&tpg->acl_node_lock);
 423         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 424         tpg->num_node_acls++;
 425         spin_unlock_irq(&tpg->acl_node_lock);
 426
 427 done:
 428         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 429                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 430                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 431                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 432
 433         return acl;
 434 }
 435 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 436
 437 /*      core_tpg_del_initiator_node_acl():
 438  *
 439  *
 440  */
 441 int core_tpg_del_initiator_node_acl(
 442         struct se_portal_group *tpg,
 443         struct se_node_acl *acl,
 444         int force)
 445 {
 446         LIST_HEAD(sess_list);
 447         struct se_session *sess, *sess_tmp;
 448         unsigned long flags;
 449         int rc;
 450
 451         spin_lock_irq(&tpg->acl_node_lock);
 452         if (acl->dynamic_node_acl) {
 453                 acl->dynamic_node_acl = 0;
 454         }
 455         list_del(&acl->acl_list);
 456         tpg->num_node_acls--;
 457         spin_unlock_irq(&tpg->acl_node_lock);
 458
 459         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 460         acl->acl_stop = 1;
 461
 462         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 463                                 sess_acl_list) {
 464                 if (sess->sess_tearing_down != 0)
 465                         continue;
 466
 467                 target_get_session(sess);
 468                 list_move(&sess->sess_acl_list, &sess_list);
 469         }
 470         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 471
 472         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 473                 list_del(&sess->sess_acl_list);
 474
 475                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 476                 target_put_session(sess);
 477                 if (!rc)
 478                         continue;
 479                 target_put_session(sess);
 480         }
 481         target_put_nacl(acl);
 482         /*
 483          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 484          * for active fabric session transport_deregister_session() callbacks.
 485          */
 486         wait_for_completion(&acl->acl_free_comp);
 487
 488         core_tpg_wait_for_nacl_pr_ref(acl);
 489         core_clear_initiator_node_from_tpg(acl, tpg);
 490         core_free_device_list_for_node(acl, tpg);
 491
 492         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 493                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 494                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 495                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 496
 497         return 0;
 498 }
 499 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 500
 501 /*      core_tpg_set_initiator_node_queue_depth():
 502  *
 503  *
 504  */
 505 int core_tpg_set_initiator_node_queue_depth(
 506         struct se_portal_group *tpg,
 507         unsigned char *initiatorname,
 508         u32 queue_depth,
 509         int force)
 510 {
 511         struct se_session *sess, *init_sess = NULL;
 512         struct se_node_acl *acl;
 513         unsigned long flags;
 514         int dynamic_acl = 0;
 515
 516         spin_lock_irq(&tpg->acl_node_lock);
 517         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 518         if (!acl) {
 519                 pr_err("Access Control List entry for %s Initiator"
 520                         " Node %s does not exists for TPG %hu, ignoring"
 521                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 522                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 523                 spin_unlock_irq(&tpg->acl_node_lock);
 524                 return -ENODEV;
 525         }
 526         if (acl->dynamic_node_acl) {
 527                 acl->dynamic_node_acl = 0;
 528                 dynamic_acl = 1;
 529         }
 530         spin_unlock_irq(&tpg->acl_node_lock);
 531
 532         spin_lock_irqsave(&tpg->session_lock, flags);
 533         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 534                 if (sess->se_node_acl != acl)
 535                         continue;
 536
 537                 if (!force) {
 538                         pr_err("Unable to change queue depth for %s"
 539                                 " Initiator Node: %s while session is"
 540                                 " operational.  To forcefully change the queue"
 541                                 " depth and force session reinstatement"
 542                                 " use the \"force=1\" parameter.\n",
 543                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 544                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 545
 546                         spin_lock_irq(&tpg->acl_node_lock);
 547                         if (dynamic_acl)
 548                                 acl->dynamic_node_acl = 1;
 549                         spin_unlock_irq(&tpg->acl_node_lock);
 550                         return -EEXIST;
 551                 }
 552                 /*
 553                  * Determine if the session needs to be closed by our context.
 554                  */
 555                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 556                         continue;
 557
 558                 init_sess = sess;
 559                 break;
 560         }
 561
 562         /*
 563          * User has requested to change the queue depth for a Initiator Node.
 564          * Change the value in the Node's struct se_node_acl, and call
 565          * core_set_queue_depth_for_node() to add the requested queue depth.
 566          *
 567          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 568          * reinstatement to occur if there is an active session for the
 569          * $FABRIC_MOD Initiator Node in question.
 570          */
 571         acl->queue_depth = queue_depth;
 572
 573         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 574                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 575                 /*
 576                  * Force session reinstatement if
 577                  * core_set_queue_depth_for_node() failed, because we assume
 578                  * the $FABRIC_MOD has already the set session reinstatement
 579                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 580                  */
 581                 if (init_sess)
 582                         tpg->se_tpg_tfo->close_session(init_sess);
 583
 584                 spin_lock_irq(&tpg->acl_node_lock);
 585                 if (dynamic_acl)
 586                         acl->dynamic_node_acl = 1;
 587                 spin_unlock_irq(&tpg->acl_node_lock);
 588                 return -EINVAL;
 589         }
 590         spin_unlock_irqrestore(&tpg->session_lock, flags);
 591         /*
 592          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 593          * forcefully shutdown the $FABRIC_MOD session/nexus.
 594          */
 595         if (init_sess)
 596                 tpg->se_tpg_tfo->close_session(init_sess);
 597
 598         pr_debug("Successfully changed queue depth to: %d for Initiator"
 599                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 600                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 601                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 602
 603         spin_lock_irq(&tpg->acl_node_lock);
 604         if (dynamic_acl)
 605                 acl->dynamic_node_acl = 1;
 606         spin_unlock_irq(&tpg->acl_node_lock);
 607
 608         return 0;
 609 }
 610 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 611
 612 /*      core_tpg_set_initiator_node_tag():
 613  *
 614  *      Initiator nodeacl tags are not used internally, but may be used by
 615  *      userspace to emulate aliases or groups.
 616  *      Returns length of newly-set tag or -EINVAL.
 617  */
 618 int core_tpg_set_initiator_node_tag(
 619         struct se_portal_group *tpg,
 620         struct se_node_acl *acl,
 621         const char *new_tag)
 622 {
 623         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 624                 return -EINVAL;
 625
 626         if (!strncmp("NULL", new_tag, 4)) {
 627                 acl->acl_tag[0] = '\0';
 628                 return 0;
 629         }
 630
 631         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 632 }
 633 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 634
 635 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 636 {
 637         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 638
 639         complete(&lun->lun_ref_comp);
 640 }
 641
 642 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 643 {
 644         /* Set in core_dev_setup_virtual_lun0() */
 645         struct se_device *dev = g_lun0_dev;
 646         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 647         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 648         int ret;
 649
 650         lun->unpacked_lun = 0;
 651         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 652         atomic_set(&lun->lun_acl_count, 0);
 653         init_completion(&lun->lun_shutdown_comp);
 654         INIT_LIST_HEAD(&lun->lun_acl_list);
 655         spin_lock_init(&lun->lun_acl_lock);
 656         spin_lock_init(&lun->lun_sep_lock);
 657         init_completion(&lun->lun_ref_comp);
 658
 659         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 660         if (ret < 0)
 661                 return ret;
 662
 663         return 0;
 664 }
 665
 666 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 667 {
 668         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 669
 670         core_tpg_post_dellun(se_tpg, lun);
 671 }
 672
 673 int core_tpg_register(
 674         struct target_core_fabric_ops *tfo,
 675         struct se_wwn *se_wwn,
 676         struct se_portal_group *se_tpg,
 677         void *tpg_fabric_ptr,
 678         int se_tpg_type)
 679 {
 680         struct se_lun *lun;
 681         u32 i;
 682
 683         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 684                         sizeof(struct se_lun), GFP_KERNEL);
 685         if (!se_tpg->tpg_lun_list) {
 686                 pr_err("Unable to allocate struct se_portal_group->"
 687                                 "tpg_lun_list\n");
 688                 return -ENOMEM;
 689         }
 690
 691         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 692                 lun = se_tpg->tpg_lun_list[i];
 693                 lun->unpacked_lun = i;
 694                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 695                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 696                 atomic_set(&lun->lun_acl_count, 0);
 697                 init_completion(&lun->lun_shutdown_comp);
 698                 INIT_LIST_HEAD(&lun->lun_acl_list);
 699                 spin_lock_init(&lun->lun_acl_lock);
 700                 spin_lock_init(&lun->lun_sep_lock);
 701                 init_completion(&lun->lun_ref_comp);
 702         }
 703
 704         se_tpg->se_tpg_type = se_tpg_type;
 705         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 706         se_tpg->se_tpg_tfo = tfo;
 707         se_tpg->se_tpg_wwn = se_wwn;
 708         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 709         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 710         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 711         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 712         spin_lock_init(&se_tpg->acl_node_lock);
 713         spin_lock_init(&se_tpg->session_lock);
 714         spin_lock_init(&se_tpg->tpg_lun_lock);
 715
 716         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 717                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 718                         array_free(se_tpg->tpg_lun_list,
 719                                    TRANSPORT_MAX_LUNS_PER_TPG);
 720                         return -ENOMEM;
 721                 }
 722         }
 723
 724         spin_lock_bh(&tpg_lock);
 725         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 726         spin_unlock_bh(&tpg_lock);
 727
 728         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 729                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 730                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 731                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 732                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 733
 734         return 0;
 735 }
 736 EXPORT_SYMBOL(core_tpg_register);
 737
 738 int core_tpg_deregister(struct se_portal_group *se_tpg)
 739 {
 740         struct se_node_acl *nacl, *nacl_tmp;
 741
 742         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 743                 " for endpoint: %s Portal Tag %u\n",
 744                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 745                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 746                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 747                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 748
 749         spin_lock_bh(&tpg_lock);
 750         list_del(&se_tpg->se_tpg_node);
 751         spin_unlock_bh(&tpg_lock);
 752
 753         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 754                 cpu_relax();
 755         /*
 756          * Release any remaining demo-mode generated se_node_acl that have
 757          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 758          * in transport_deregister_session().
 759          */
 760         spin_lock_irq(&se_tpg->acl_node_lock);
 761         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 762                         acl_list) {
 763                 list_del(&nacl->acl_list);
 764                 se_tpg->num_node_acls--;
 765                 spin_unlock_irq(&se_tpg->acl_node_lock);
 766
 767                 core_tpg_wait_for_nacl_pr_ref(nacl);
 768                 core_free_device_list_for_node(nacl, se_tpg);
 769                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 770
 771                 spin_lock_irq(&se_tpg->acl_node_lock);
 772         }
 773         spin_unlock_irq(&se_tpg->acl_node_lock);
 774
 775         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 776                 core_tpg_release_virtual_lun0(se_tpg);
 777
 778         se_tpg->se_tpg_fabric_ptr = NULL;
 779         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 780         return 0;
 781 }
 782 EXPORT_SYMBOL(core_tpg_deregister);
 783
 784 struct se_lun *core_tpg_alloc_lun(
 785         struct se_portal_group *tpg,
 786         u32 unpacked_lun)
 787 {
 788         struct se_lun *lun;
 789
 790         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 791                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 792                         "-1: %u for Target Portal Group: %u\n",
 793                         tpg->se_tpg_tfo->get_fabric_name(),
 794                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 795                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 796                 return ERR_PTR(-EOVERFLOW);
 797         }
 798
 799         spin_lock(&tpg->tpg_lun_lock);
 800         lun = tpg->tpg_lun_list[unpacked_lun];
 801         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 802                 pr_err("TPG Logical Unit Number: %u is already active"
 803                         " on %s Target Portal Group: %u, ignoring request.\n",
 804                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 805                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 806                 spin_unlock(&tpg->tpg_lun_lock);
 807                 return ERR_PTR(-EINVAL);
 808         }
 809         spin_unlock(&tpg->tpg_lun_lock);
 810
 811         return lun;
 812 }
 813
 814 int core_tpg_add_lun(
 815         struct se_portal_group *tpg,
 816         struct se_lun *lun,
 817         u32 lun_access,
 818         struct se_device *dev)
 819 {
 820         int ret;
 821
 822         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release);
 823         if (ret < 0)
 824                 return ret;
 825
 826         ret = core_dev_export(dev, tpg, lun);
 827         if (ret < 0) {
 828                 percpu_ref_cancel_init(&lun->lun_ref);
 829                 return ret;
 830         }
 831
 832         spin_lock(&tpg->tpg_lun_lock);
 833         lun->lun_access = lun_access;
 834         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 835         spin_unlock(&tpg->tpg_lun_lock);
 836
 837         return 0;
 838 }
 839
 840 struct se_lun *core_tpg_pre_dellun(
 841         struct se_portal_group *tpg,
 842         u32 unpacked_lun)
 843 {
 844         struct se_lun *lun;
 845
 846         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 847                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 848                         "-1: %u for Target Portal Group: %u\n",
 849                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 850                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 851                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 852                 return ERR_PTR(-EOVERFLOW);
 853         }
 854
 855         spin_lock(&tpg->tpg_lun_lock);
 856         lun = tpg->tpg_lun_list[unpacked_lun];
 857         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 858                 pr_err("%s Logical Unit Number: %u is not active on"
 859                         " Target Portal Group: %u, ignoring request.\n",
 860                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 861                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 862                 spin_unlock(&tpg->tpg_lun_lock);
 863                 return ERR_PTR(-ENODEV);
 864         }
 865         spin_unlock(&tpg->tpg_lun_lock);
 866
 867         return lun;
 868 }
 869
 870 int core_tpg_post_dellun(
 871         struct se_portal_group *tpg,
 872         struct se_lun *lun)
 873 {
 874         core_clear_lun_from_tpg(lun, tpg);
 875         transport_clear_lun_ref(lun);
 876
 877         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 878
 879         spin_lock(&tpg->tpg_lun_lock);
 880         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 881         spin_unlock(&tpg->tpg_lun_lock);
 882
 883         return 0;
 884 }