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 #include "target_core_pr.h"
  44
  45 extern struct se_device *g_lun0_dev;
  46
  47 static DEFINE_SPINLOCK(tpg_lock);
  48 static LIST_HEAD(tpg_list);
  49
  50 /*      core_clear_initiator_node_from_tpg():
  51  *
  52  *
  53  */
  54 static void core_clear_initiator_node_from_tpg(
  55         struct se_node_acl *nacl,
  56         struct se_portal_group *tpg)
  57 {
  58         int i;
  59         struct se_dev_entry *deve;
  60         struct se_lun *lun;
  61
  62         spin_lock_irq(&nacl->device_list_lock);
  63         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  64                 deve = nacl->device_list[i];
  65
  66                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  67                         continue;
  68
  69                 if (!deve->se_lun) {
  70                         pr_err("%s device entries device pointer is"
  71                                 " NULL, but Initiator has access.\n",
  72                                 tpg->se_tpg_tfo->get_fabric_name());
  73                         continue;
  74                 }
  75
  76                 lun = deve->se_lun;
  77                 spin_unlock_irq(&nacl->device_list_lock);
  78                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
  79                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
  80
  81                 spin_lock_irq(&nacl->device_list_lock);
  82         }
  83         spin_unlock_irq(&nacl->device_list_lock);
  84 }
  85
  86 /*      __core_tpg_get_initiator_node_acl():
  87  *
  88  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  89  */
  90 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  91         struct se_portal_group *tpg,
  92         const char *initiatorname)
  93 {
  94         struct se_node_acl *acl;
  95
  96         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  97                 if (!strcmp(acl->initiatorname, initiatorname))
  98                         return acl;
  99         }
 100
 101         return NULL;
 102 }
 103
 104 /*      core_tpg_get_initiator_node_acl():
 105  *
 106  *
 107  */
 108 struct se_node_acl *core_tpg_get_initiator_node_acl(
 109         struct se_portal_group *tpg,
 110         unsigned char *initiatorname)
 111 {
 112         struct se_node_acl *acl;
 113
 114         spin_lock_irq(&tpg->acl_node_lock);
 115         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 116         spin_unlock_irq(&tpg->acl_node_lock);
 117
 118         return acl;
 119 }
 120 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
 121
 122 /*      core_tpg_add_node_to_devs():
 123  *
 124  *
 125  */
 126 void core_tpg_add_node_to_devs(
 127         struct se_node_acl *acl,
 128         struct se_portal_group *tpg)
 129 {
 130         int i = 0;
 131         u32 lun_access = 0;
 132         struct se_lun *lun;
 133         struct se_device *dev;
 134
 135         spin_lock(&tpg->tpg_lun_lock);
 136         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 137                 lun = tpg->tpg_lun_list[i];
 138                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 139                         continue;
 140
 141                 spin_unlock(&tpg->tpg_lun_lock);
 142
 143                 dev = lun->lun_se_dev;
 144                 /*
 145                  * By default in LIO-Target $FABRIC_MOD,
 146                  * demo_mode_write_protect is ON, or READ_ONLY;
 147                  */
 148                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 149                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 150                 } else {
 151                         /*
 152                          * Allow only optical drives to issue R/W in default RO
 153                          * demo mode.
 154                          */
 155                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 156                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 157                         else
 158                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 159                 }
 160
 161                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 162                         " access for LUN in Demo Mode\n",
 163                         tpg->se_tpg_tfo->get_fabric_name(),
 164                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 165                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 166                         "READ-WRITE" : "READ-ONLY");
 167
 168                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 169                                 lun_access, acl, tpg);
 170                 /*
 171                  * Check to see if there are any existing persistent reservation
 172                  * APTPL pre-registrations that need to be enabled for this dynamic
 173                  * LUN ACL now..
 174                  */
 175                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 176                                                     lun->unpacked_lun);
 177                 spin_lock(&tpg->tpg_lun_lock);
 178         }
 179         spin_unlock(&tpg->tpg_lun_lock);
 180 }
 181
 182 /*      core_set_queue_depth_for_node():
 183  *
 184  *
 185  */
 186 static int core_set_queue_depth_for_node(
 187         struct se_portal_group *tpg,
 188         struct se_node_acl *acl)
 189 {
 190         if (!acl->queue_depth) {
 191                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 192                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 193                         acl->initiatorname);
 194                 acl->queue_depth = 1;
 195         }
 196
 197         return 0;
 198 }
 199
 200 void array_free(void *array, int n)
 201 {
 202         void **a = array;
 203         int i;
 204
 205         for (i = 0; i < n; i++)
 206                 kfree(a[i]);
 207         kfree(a);
 208 }
 209
 210 static void *array_zalloc(int n, size_t size, gfp_t flags)
 211 {
 212         void **a;
 213         int i;
 214
 215         a = kzalloc(n * sizeof(void*), flags);
 216         if (!a)
 217                 return NULL;
 218         for (i = 0; i < n; i++) {
 219                 a[i] = kzalloc(size, flags);
 220                 if (!a[i]) {
 221                         array_free(a, n);
 222                         return NULL;
 223                 }
 224         }
 225         return a;
 226 }
 227
 228 /*      core_create_device_list_for_node():
 229  *
 230  *
 231  */
 232 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 233 {
 234         struct se_dev_entry *deve;
 235         int i;
 236
 237         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 238                         sizeof(struct se_dev_entry), GFP_KERNEL);
 239         if (!nacl->device_list) {
 240                 pr_err("Unable to allocate memory for"
 241                         " struct se_node_acl->device_list\n");
 242                 return -ENOMEM;
 243         }
 244         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 245                 deve = nacl->device_list[i];
 246
 247                 atomic_set(&deve->ua_count, 0);
 248                 atomic_set(&deve->pr_ref_count, 0);
 249                 spin_lock_init(&deve->ua_lock);
 250                 INIT_LIST_HEAD(&deve->alua_port_list);
 251                 INIT_LIST_HEAD(&deve->ua_list);
 252         }
 253
 254         return 0;
 255 }
 256
 257 /*      core_tpg_check_initiator_node_acl()
 258  *
 259  *
 260  */
 261 struct se_node_acl *core_tpg_check_initiator_node_acl(
 262         struct se_portal_group *tpg,
 263         unsigned char *initiatorname)
 264 {
 265         struct se_node_acl *acl;
 266
 267         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 268         if (acl)
 269                 return acl;
 270
 271         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 272                 return NULL;
 273
 274         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 275         if (!acl)
 276                 return NULL;
 277
 278         INIT_LIST_HEAD(&acl->acl_list);
 279         INIT_LIST_HEAD(&acl->acl_sess_list);
 280         kref_init(&acl->acl_kref);
 281         init_completion(&acl->acl_free_comp);
 282         spin_lock_init(&acl->device_list_lock);
 283         spin_lock_init(&acl->nacl_sess_lock);
 284         atomic_set(&acl->acl_pr_ref_count, 0);
 285         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 286         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 287         acl->se_tpg = tpg;
 288         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 289         acl->dynamic_node_acl = 1;
 290
 291         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 292
 293         if (core_create_device_list_for_node(acl) < 0) {
 294                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 295                 return NULL;
 296         }
 297
 298         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 299                 core_free_device_list_for_node(acl, tpg);
 300                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 301                 return NULL;
 302         }
 303         /*
 304          * Here we only create demo-mode MappedLUNs from the active
 305          * TPG LUNs if the fabric is not explicitly asking for
 306          * tpg_check_demo_mode_login_only() == 1.
 307          */
 308         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 309             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 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;
 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                 core_dev_del_lun(tpg, 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
 417         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 418
 419         if (core_create_device_list_for_node(acl) < 0) {
 420                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 421                 return ERR_PTR(-ENOMEM);
 422         }
 423
 424         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 425                 core_free_device_list_for_node(acl, tpg);
 426                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 427                 return ERR_PTR(-EINVAL);
 428         }
 429
 430         spin_lock_irq(&tpg->acl_node_lock);
 431         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 432         tpg->num_node_acls++;
 433         spin_unlock_irq(&tpg->acl_node_lock);
 434
 435 done:
 436         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 437                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 438                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 439                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 440
 441         return acl;
 442 }
 443 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 444
 445 /*      core_tpg_del_initiator_node_acl():
 446  *
 447  *
 448  */
 449 int core_tpg_del_initiator_node_acl(
 450         struct se_portal_group *tpg,
 451         struct se_node_acl *acl,
 452         int force)
 453 {
 454         LIST_HEAD(sess_list);
 455         struct se_session *sess, *sess_tmp;
 456         unsigned long flags;
 457         int rc;
 458
 459         spin_lock_irq(&tpg->acl_node_lock);
 460         if (acl->dynamic_node_acl) {
 461                 acl->dynamic_node_acl = 0;
 462         }
 463         list_del(&acl->acl_list);
 464         tpg->num_node_acls--;
 465         spin_unlock_irq(&tpg->acl_node_lock);
 466
 467         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 468         acl->acl_stop = 1;
 469
 470         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 471                                 sess_acl_list) {
 472                 if (sess->sess_tearing_down != 0)
 473                         continue;
 474
 475                 target_get_session(sess);
 476                 list_move(&sess->sess_acl_list, &sess_list);
 477         }
 478         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 479
 480         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 481                 list_del(&sess->sess_acl_list);
 482
 483                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 484                 target_put_session(sess);
 485                 if (!rc)
 486                         continue;
 487                 target_put_session(sess);
 488         }
 489         target_put_nacl(acl);
 490         /*
 491          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 492          * for active fabric session transport_deregister_session() callbacks.
 493          */
 494         wait_for_completion(&acl->acl_free_comp);
 495
 496         core_tpg_wait_for_nacl_pr_ref(acl);
 497         core_clear_initiator_node_from_tpg(acl, tpg);
 498         core_free_device_list_for_node(acl, tpg);
 499
 500         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 501                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 502                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 503                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 504
 505         return 0;
 506 }
 507 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 508
 509 /*      core_tpg_set_initiator_node_queue_depth():
 510  *
 511  *
 512  */
 513 int core_tpg_set_initiator_node_queue_depth(
 514         struct se_portal_group *tpg,
 515         unsigned char *initiatorname,
 516         u32 queue_depth,
 517         int force)
 518 {
 519         struct se_session *sess, *init_sess = NULL;
 520         struct se_node_acl *acl;
 521         unsigned long flags;
 522         int dynamic_acl = 0;
 523
 524         spin_lock_irq(&tpg->acl_node_lock);
 525         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 526         if (!acl) {
 527                 pr_err("Access Control List entry for %s Initiator"
 528                         " Node %s does not exists for TPG %hu, ignoring"
 529                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 530                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 531                 spin_unlock_irq(&tpg->acl_node_lock);
 532                 return -ENODEV;
 533         }
 534         if (acl->dynamic_node_acl) {
 535                 acl->dynamic_node_acl = 0;
 536                 dynamic_acl = 1;
 537         }
 538         spin_unlock_irq(&tpg->acl_node_lock);
 539
 540         spin_lock_irqsave(&tpg->session_lock, flags);
 541         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 542                 if (sess->se_node_acl != acl)
 543                         continue;
 544
 545                 if (!force) {
 546                         pr_err("Unable to change queue depth for %s"
 547                                 " Initiator Node: %s while session is"
 548                                 " operational.  To forcefully change the queue"
 549                                 " depth and force session reinstatement"
 550                                 " use the \"force=1\" parameter.\n",
 551                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 552                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 553
 554                         spin_lock_irq(&tpg->acl_node_lock);
 555                         if (dynamic_acl)
 556                                 acl->dynamic_node_acl = 1;
 557                         spin_unlock_irq(&tpg->acl_node_lock);
 558                         return -EEXIST;
 559                 }
 560                 /*
 561                  * Determine if the session needs to be closed by our context.
 562                  */
 563                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 564                         continue;
 565
 566                 init_sess = sess;
 567                 break;
 568         }
 569
 570         /*
 571          * User has requested to change the queue depth for a Initiator Node.
 572          * Change the value in the Node's struct se_node_acl, and call
 573          * core_set_queue_depth_for_node() to add the requested queue depth.
 574          *
 575          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 576          * reinstatement to occur if there is an active session for the
 577          * $FABRIC_MOD Initiator Node in question.
 578          */
 579         acl->queue_depth = queue_depth;
 580
 581         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 582                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 583                 /*
 584                  * Force session reinstatement if
 585                  * core_set_queue_depth_for_node() failed, because we assume
 586                  * the $FABRIC_MOD has already the set session reinstatement
 587                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 588                  */
 589                 if (init_sess)
 590                         tpg->se_tpg_tfo->close_session(init_sess);
 591
 592                 spin_lock_irq(&tpg->acl_node_lock);
 593                 if (dynamic_acl)
 594                         acl->dynamic_node_acl = 1;
 595                 spin_unlock_irq(&tpg->acl_node_lock);
 596                 return -EINVAL;
 597         }
 598         spin_unlock_irqrestore(&tpg->session_lock, flags);
 599         /*
 600          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 601          * forcefully shutdown the $FABRIC_MOD session/nexus.
 602          */
 603         if (init_sess)
 604                 tpg->se_tpg_tfo->close_session(init_sess);
 605
 606         pr_debug("Successfully changed queue depth to: %d for Initiator"
 607                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 608                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 609                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 610
 611         spin_lock_irq(&tpg->acl_node_lock);
 612         if (dynamic_acl)
 613                 acl->dynamic_node_acl = 1;
 614         spin_unlock_irq(&tpg->acl_node_lock);
 615
 616         return 0;
 617 }
 618 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 619
 620 /*      core_tpg_set_initiator_node_tag():
 621  *
 622  *      Initiator nodeacl tags are not used internally, but may be used by
 623  *      userspace to emulate aliases or groups.
 624  *      Returns length of newly-set tag or -EINVAL.
 625  */
 626 int core_tpg_set_initiator_node_tag(
 627         struct se_portal_group *tpg,
 628         struct se_node_acl *acl,
 629         const char *new_tag)
 630 {
 631         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 632                 return -EINVAL;
 633
 634         if (!strncmp("NULL", new_tag, 4)) {
 635                 acl->acl_tag[0] = '\0';
 636                 return 0;
 637         }
 638
 639         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 640 }
 641 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 642
 643 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 644 {
 645         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 646
 647         complete(&lun->lun_ref_comp);
 648 }
 649
 650 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 651 {
 652         /* Set in core_dev_setup_virtual_lun0() */
 653         struct se_device *dev = g_lun0_dev;
 654         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 655         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 656         int ret;
 657
 658         lun->unpacked_lun = 0;
 659         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 660         atomic_set(&lun->lun_acl_count, 0);
 661         init_completion(&lun->lun_shutdown_comp);
 662         INIT_LIST_HEAD(&lun->lun_acl_list);
 663         spin_lock_init(&lun->lun_acl_lock);
 664         spin_lock_init(&lun->lun_sep_lock);
 665         init_completion(&lun->lun_ref_comp);
 666
 667         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 668         if (ret < 0)
 669                 return ret;
 670
 671         return 0;
 672 }
 673
 674 int core_tpg_register(
 675         struct target_core_fabric_ops *tfo,
 676         struct se_wwn *se_wwn,
 677         struct se_portal_group *se_tpg,
 678         void *tpg_fabric_ptr,
 679         int se_tpg_type)
 680 {
 681         struct se_lun *lun;
 682         u32 i;
 683
 684         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 685                         sizeof(struct se_lun), GFP_KERNEL);
 686         if (!se_tpg->tpg_lun_list) {
 687                 pr_err("Unable to allocate struct se_portal_group->"
 688                                 "tpg_lun_list\n");
 689                 return -ENOMEM;
 690         }
 691
 692         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 693                 lun = se_tpg->tpg_lun_list[i];
 694                 lun->unpacked_lun = i;
 695                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 696                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 697                 atomic_set(&lun->lun_acl_count, 0);
 698                 init_completion(&lun->lun_shutdown_comp);
 699                 INIT_LIST_HEAD(&lun->lun_acl_list);
 700                 spin_lock_init(&lun->lun_acl_lock);
 701                 spin_lock_init(&lun->lun_sep_lock);
 702                 init_completion(&lun->lun_ref_comp);
 703         }
 704
 705         se_tpg->se_tpg_type = se_tpg_type;
 706         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 707         se_tpg->se_tpg_tfo = tfo;
 708         se_tpg->se_tpg_wwn = se_wwn;
 709         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 710         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 711         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 712         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 713         spin_lock_init(&se_tpg->acl_node_lock);
 714         spin_lock_init(&se_tpg->session_lock);
 715         spin_lock_init(&se_tpg->tpg_lun_lock);
 716
 717         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 718                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 719                         array_free(se_tpg->tpg_lun_list,
 720                                    TRANSPORT_MAX_LUNS_PER_TPG);
 721                         return -ENOMEM;
 722                 }
 723         }
 724
 725         spin_lock_bh(&tpg_lock);
 726         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 727         spin_unlock_bh(&tpg_lock);
 728
 729         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 730                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 731                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 732                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 733                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 734
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(core_tpg_register);
 738
 739 int core_tpg_deregister(struct se_portal_group *se_tpg)
 740 {
 741         struct se_node_acl *nacl, *nacl_tmp;
 742
 743         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 744                 " for endpoint: %s Portal Tag %u\n",
 745                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 746                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 747                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 748                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 749
 750         spin_lock_bh(&tpg_lock);
 751         list_del(&se_tpg->se_tpg_node);
 752         spin_unlock_bh(&tpg_lock);
 753
 754         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 755                 cpu_relax();
 756         /*
 757          * Release any remaining demo-mode generated se_node_acl that have
 758          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 759          * in transport_deregister_session().
 760          */
 761         spin_lock_irq(&se_tpg->acl_node_lock);
 762         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 763                         acl_list) {
 764                 list_del(&nacl->acl_list);
 765                 se_tpg->num_node_acls--;
 766                 spin_unlock_irq(&se_tpg->acl_node_lock);
 767
 768                 core_tpg_wait_for_nacl_pr_ref(nacl);
 769                 core_free_device_list_for_node(nacl, se_tpg);
 770                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 771
 772                 spin_lock_irq(&se_tpg->acl_node_lock);
 773         }
 774         spin_unlock_irq(&se_tpg->acl_node_lock);
 775
 776         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 777                 core_tpg_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
 778
 779         se_tpg->se_tpg_fabric_ptr = NULL;
 780         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 781         return 0;
 782 }
 783 EXPORT_SYMBOL(core_tpg_deregister);
 784
 785 struct se_lun *core_tpg_alloc_lun(
 786         struct se_portal_group *tpg,
 787         u32 unpacked_lun)
 788 {
 789         struct se_lun *lun;
 790
 791         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 792                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 793                         "-1: %u for Target Portal Group: %u\n",
 794                         tpg->se_tpg_tfo->get_fabric_name(),
 795                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 796                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 797                 return ERR_PTR(-EOVERFLOW);
 798         }
 799
 800         spin_lock(&tpg->tpg_lun_lock);
 801         lun = tpg->tpg_lun_list[unpacked_lun];
 802         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 803                 pr_err("TPG Logical Unit Number: %u is already active"
 804                         " on %s Target Portal Group: %u, ignoring request.\n",
 805                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 806                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 807                 spin_unlock(&tpg->tpg_lun_lock);
 808                 return ERR_PTR(-EINVAL);
 809         }
 810         spin_unlock(&tpg->tpg_lun_lock);
 811
 812         return lun;
 813 }
 814
 815 int core_tpg_add_lun(
 816         struct se_portal_group *tpg,
 817         struct se_lun *lun,
 818         u32 lun_access,
 819         struct se_device *dev)
 820 {
 821         int ret;
 822
 823         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 824                               GFP_KERNEL);
 825         if (ret < 0)
 826                 return ret;
 827
 828         ret = core_dev_export(dev, tpg, lun);
 829         if (ret < 0) {
 830                 percpu_ref_exit(&lun->lun_ref);
 831                 return ret;
 832         }
 833
 834         spin_lock(&tpg->tpg_lun_lock);
 835         lun->lun_access = lun_access;
 836         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 837         spin_unlock(&tpg->tpg_lun_lock);
 838
 839         return 0;
 840 }
 841
 842 void core_tpg_remove_lun(
 843         struct se_portal_group *tpg,
 844         struct se_lun *lun)
 845 {
 846         core_clear_lun_from_tpg(lun, tpg);
 847         transport_clear_lun_ref(lun);
 848
 849         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 850
 851         spin_lock(&tpg->tpg_lun_lock);
 852         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 853         spin_unlock(&tpg->tpg_lun_lock);
 854
 855         percpu_ref_exit(&lun->lun_ref);
 856 }