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
 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                 /*
 170                  * Check to see if there are any existing persistent reservation
 171                  * APTPL pre-registrations that need to be enabled for this dynamic
 172                  * LUN ACL now..
 173                  */
 174                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 175                                                     lun->unpacked_lun);
 176                 spin_lock(&tpg->tpg_lun_lock);
 177         }
 178         spin_unlock(&tpg->tpg_lun_lock);
 179 }
 180
 181 /*      core_set_queue_depth_for_node():
 182  *
 183  *
 184  */
 185 static int core_set_queue_depth_for_node(
 186         struct se_portal_group *tpg,
 187         struct se_node_acl *acl)
 188 {
 189         if (!acl->queue_depth) {
 190                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 191                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 192                         acl->initiatorname);
 193                 acl->queue_depth = 1;
 194         }
 195
 196         return 0;
 197 }
 198
 199 void array_free(void *array, int n)
 200 {
 201         void **a = array;
 202         int i;
 203
 204         for (i = 0; i < n; i++)
 205                 kfree(a[i]);
 206         kfree(a);
 207 }
 208
 209 static void *array_zalloc(int n, size_t size, gfp_t flags)
 210 {
 211         void **a;
 212         int i;
 213
 214         a = kzalloc(n * sizeof(void*), flags);
 215         if (!a)
 216                 return NULL;
 217         for (i = 0; i < n; i++) {
 218                 a[i] = kzalloc(size, flags);
 219                 if (!a[i]) {
 220                         array_free(a, n);
 221                         return NULL;
 222                 }
 223         }
 224         return a;
 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 = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 237                         sizeof(struct se_dev_entry), 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         kref_init(&acl->acl_kref);
 280         init_completion(&acl->acl_free_comp);
 281         spin_lock_init(&acl->device_list_lock);
 282         spin_lock_init(&acl->nacl_sess_lock);
 283         atomic_set(&acl->acl_pr_ref_count, 0);
 284         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 285         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 286         acl->se_tpg = tpg;
 287         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 288         spin_lock_init(&acl->stats_lock);
 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->unpacked_lun);
 347                 spin_lock(&tpg->tpg_lun_lock);
 348         }
 349         spin_unlock(&tpg->tpg_lun_lock);
 350 }
 351 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 352
 353 /*      core_tpg_add_initiator_node_acl():
 354  *
 355  *
 356  */
 357 struct se_node_acl *core_tpg_add_initiator_node_acl(
 358         struct se_portal_group *tpg,
 359         struct se_node_acl *se_nacl,
 360         const char *initiatorname,
 361         u32 queue_depth)
 362 {
 363         struct se_node_acl *acl = NULL;
 364
 365         spin_lock_irq(&tpg->acl_node_lock);
 366         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 367         if (acl) {
 368                 if (acl->dynamic_node_acl) {
 369                         acl->dynamic_node_acl = 0;
 370                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 371                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 372                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 373                         spin_unlock_irq(&tpg->acl_node_lock);
 374                         /*
 375                          * Release the locally allocated struct se_node_acl
 376                          * because * core_tpg_add_initiator_node_acl() returned
 377                          * a pointer to an existing demo mode node ACL.
 378                          */
 379                         if (se_nacl)
 380                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 381                                                         se_nacl);
 382                         goto done;
 383                 }
 384
 385                 pr_err("ACL entry for %s Initiator"
 386                         " Node %s already exists for TPG %u, ignoring"
 387                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 388                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 389                 spin_unlock_irq(&tpg->acl_node_lock);
 390                 return ERR_PTR(-EEXIST);
 391         }
 392         spin_unlock_irq(&tpg->acl_node_lock);
 393
 394         if (!se_nacl) {
 395                 pr_err("struct se_node_acl pointer is NULL\n");
 396                 return ERR_PTR(-EINVAL);
 397         }
 398         /*
 399          * For v4.x logic the se_node_acl_s is hanging off a fabric
 400          * dependent structure allocated via
 401          * struct target_core_fabric_ops->fabric_make_nodeacl()
 402          */
 403         acl = se_nacl;
 404
 405         INIT_LIST_HEAD(&acl->acl_list);
 406         INIT_LIST_HEAD(&acl->acl_sess_list);
 407         kref_init(&acl->acl_kref);
 408         init_completion(&acl->acl_free_comp);
 409         spin_lock_init(&acl->device_list_lock);
 410         spin_lock_init(&acl->nacl_sess_lock);
 411         atomic_set(&acl->acl_pr_ref_count, 0);
 412         acl->queue_depth = queue_depth;
 413         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 414         acl->se_tpg = tpg;
 415         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 416         spin_lock_init(&acl->stats_lock);
 417
 418         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 419
 420         if (core_create_device_list_for_node(acl) < 0) {
 421                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 422                 return ERR_PTR(-ENOMEM);
 423         }
 424
 425         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 426                 core_free_device_list_for_node(acl, tpg);
 427                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 428                 return ERR_PTR(-EINVAL);
 429         }
 430
 431         spin_lock_irq(&tpg->acl_node_lock);
 432         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 433         tpg->num_node_acls++;
 434         spin_unlock_irq(&tpg->acl_node_lock);
 435
 436 done:
 437         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 438                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 439                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 440                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 441
 442         return acl;
 443 }
 444 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 445
 446 /*      core_tpg_del_initiator_node_acl():
 447  *
 448  *
 449  */
 450 int core_tpg_del_initiator_node_acl(
 451         struct se_portal_group *tpg,
 452         struct se_node_acl *acl,
 453         int force)
 454 {
 455         LIST_HEAD(sess_list);
 456         struct se_session *sess, *sess_tmp;
 457         unsigned long flags;
 458         int rc;
 459
 460         spin_lock_irq(&tpg->acl_node_lock);
 461         if (acl->dynamic_node_acl) {
 462                 acl->dynamic_node_acl = 0;
 463         }
 464         list_del(&acl->acl_list);
 465         tpg->num_node_acls--;
 466         spin_unlock_irq(&tpg->acl_node_lock);
 467
 468         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 469         acl->acl_stop = 1;
 470
 471         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 472                                 sess_acl_list) {
 473                 if (sess->sess_tearing_down != 0)
 474                         continue;
 475
 476                 target_get_session(sess);
 477                 list_move(&sess->sess_acl_list, &sess_list);
 478         }
 479         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 480
 481         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 482                 list_del(&sess->sess_acl_list);
 483
 484                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 485                 target_put_session(sess);
 486                 if (!rc)
 487                         continue;
 488                 target_put_session(sess);
 489         }
 490         target_put_nacl(acl);
 491         /*
 492          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 493          * for active fabric session transport_deregister_session() callbacks.
 494          */
 495         wait_for_completion(&acl->acl_free_comp);
 496
 497         core_tpg_wait_for_nacl_pr_ref(acl);
 498         core_clear_initiator_node_from_tpg(acl, tpg);
 499         core_free_device_list_for_node(acl, tpg);
 500
 501         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 502                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 503                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 504                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 505
 506         return 0;
 507 }
 508 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 509
 510 /*      core_tpg_set_initiator_node_queue_depth():
 511  *
 512  *
 513  */
 514 int core_tpg_set_initiator_node_queue_depth(
 515         struct se_portal_group *tpg,
 516         unsigned char *initiatorname,
 517         u32 queue_depth,
 518         int force)
 519 {
 520         struct se_session *sess, *init_sess = NULL;
 521         struct se_node_acl *acl;
 522         unsigned long flags;
 523         int dynamic_acl = 0;
 524
 525         spin_lock_irq(&tpg->acl_node_lock);
 526         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 527         if (!acl) {
 528                 pr_err("Access Control List entry for %s Initiator"
 529                         " Node %s does not exists for TPG %hu, ignoring"
 530                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 531                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 532                 spin_unlock_irq(&tpg->acl_node_lock);
 533                 return -ENODEV;
 534         }
 535         if (acl->dynamic_node_acl) {
 536                 acl->dynamic_node_acl = 0;
 537                 dynamic_acl = 1;
 538         }
 539         spin_unlock_irq(&tpg->acl_node_lock);
 540
 541         spin_lock_irqsave(&tpg->session_lock, flags);
 542         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 543                 if (sess->se_node_acl != acl)
 544                         continue;
 545
 546                 if (!force) {
 547                         pr_err("Unable to change queue depth for %s"
 548                                 " Initiator Node: %s while session is"
 549                                 " operational.  To forcefully change the queue"
 550                                 " depth and force session reinstatement"
 551                                 " use the \"force=1\" parameter.\n",
 552                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 553                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 554
 555                         spin_lock_irq(&tpg->acl_node_lock);
 556                         if (dynamic_acl)
 557                                 acl->dynamic_node_acl = 1;
 558                         spin_unlock_irq(&tpg->acl_node_lock);
 559                         return -EEXIST;
 560                 }
 561                 /*
 562                  * Determine if the session needs to be closed by our context.
 563                  */
 564                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 565                         continue;
 566
 567                 init_sess = sess;
 568                 break;
 569         }
 570
 571         /*
 572          * User has requested to change the queue depth for a Initiator Node.
 573          * Change the value in the Node's struct se_node_acl, and call
 574          * core_set_queue_depth_for_node() to add the requested queue depth.
 575          *
 576          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 577          * reinstatement to occur if there is an active session for the
 578          * $FABRIC_MOD Initiator Node in question.
 579          */
 580         acl->queue_depth = queue_depth;
 581
 582         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 583                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 584                 /*
 585                  * Force session reinstatement if
 586                  * core_set_queue_depth_for_node() failed, because we assume
 587                  * the $FABRIC_MOD has already the set session reinstatement
 588                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 589                  */
 590                 if (init_sess)
 591                         tpg->se_tpg_tfo->close_session(init_sess);
 592
 593                 spin_lock_irq(&tpg->acl_node_lock);
 594                 if (dynamic_acl)
 595                         acl->dynamic_node_acl = 1;
 596                 spin_unlock_irq(&tpg->acl_node_lock);
 597                 return -EINVAL;
 598         }
 599         spin_unlock_irqrestore(&tpg->session_lock, flags);
 600         /*
 601          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 602          * forcefully shutdown the $FABRIC_MOD session/nexus.
 603          */
 604         if (init_sess)
 605                 tpg->se_tpg_tfo->close_session(init_sess);
 606
 607         pr_debug("Successfully changed queue depth to: %d for Initiator"
 608                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 609                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 610                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 611
 612         spin_lock_irq(&tpg->acl_node_lock);
 613         if (dynamic_acl)
 614                 acl->dynamic_node_acl = 1;
 615         spin_unlock_irq(&tpg->acl_node_lock);
 616
 617         return 0;
 618 }
 619 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 620
 621 /*      core_tpg_set_initiator_node_tag():
 622  *
 623  *      Initiator nodeacl tags are not used internally, but may be used by
 624  *      userspace to emulate aliases or groups.
 625  *      Returns length of newly-set tag or -EINVAL.
 626  */
 627 int core_tpg_set_initiator_node_tag(
 628         struct se_portal_group *tpg,
 629         struct se_node_acl *acl,
 630         const char *new_tag)
 631 {
 632         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 633                 return -EINVAL;
 634
 635         if (!strncmp("NULL", new_tag, 4)) {
 636                 acl->acl_tag[0] = '\0';
 637                 return 0;
 638         }
 639
 640         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 641 }
 642 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 643
 644 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 645 {
 646         /* Set in core_dev_setup_virtual_lun0() */
 647         struct se_device *dev = g_lun0_dev;
 648         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 649         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 650         int ret;
 651
 652         lun->unpacked_lun = 0;
 653         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 654         atomic_set(&lun->lun_acl_count, 0);
 655         init_completion(&lun->lun_shutdown_comp);
 656         INIT_LIST_HEAD(&lun->lun_acl_list);
 657         INIT_LIST_HEAD(&lun->lun_cmd_list);
 658         spin_lock_init(&lun->lun_acl_lock);
 659         spin_lock_init(&lun->lun_cmd_lock);
 660         spin_lock_init(&lun->lun_sep_lock);
 661
 662         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 663         if (ret < 0)
 664                 return ret;
 665
 666         return 0;
 667 }
 668
 669 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 670 {
 671         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 672
 673         core_tpg_post_dellun(se_tpg, lun);
 674 }
 675
 676 int core_tpg_register(
 677         struct target_core_fabric_ops *tfo,
 678         struct se_wwn *se_wwn,
 679         struct se_portal_group *se_tpg,
 680         void *tpg_fabric_ptr,
 681         int se_tpg_type)
 682 {
 683         struct se_lun *lun;
 684         u32 i;
 685
 686         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 687                         sizeof(struct se_lun), GFP_KERNEL);
 688         if (!se_tpg->tpg_lun_list) {
 689                 pr_err("Unable to allocate struct se_portal_group->"
 690                                 "tpg_lun_list\n");
 691                 return -ENOMEM;
 692         }
 693
 694         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 695                 lun = se_tpg->tpg_lun_list[i];
 696                 lun->unpacked_lun = i;
 697                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 698                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 699                 atomic_set(&lun->lun_acl_count, 0);
 700                 init_completion(&lun->lun_shutdown_comp);
 701                 INIT_LIST_HEAD(&lun->lun_acl_list);
 702                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 703                 spin_lock_init(&lun->lun_acl_lock);
 704                 spin_lock_init(&lun->lun_cmd_lock);
 705                 spin_lock_init(&lun->lun_sep_lock);
 706         }
 707
 708         se_tpg->se_tpg_type = se_tpg_type;
 709         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 710         se_tpg->se_tpg_tfo = tfo;
 711         se_tpg->se_tpg_wwn = se_wwn;
 712         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 713         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 714         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 715         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 716         spin_lock_init(&se_tpg->acl_node_lock);
 717         spin_lock_init(&se_tpg->session_lock);
 718         spin_lock_init(&se_tpg->tpg_lun_lock);
 719
 720         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 721                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 722                         array_free(se_tpg->tpg_lun_list,
 723                                    TRANSPORT_MAX_LUNS_PER_TPG);
 724                         return -ENOMEM;
 725                 }
 726         }
 727
 728         spin_lock_bh(&tpg_lock);
 729         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 730         spin_unlock_bh(&tpg_lock);
 731
 732         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 733                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 734                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 735                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 736                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 737
 738         return 0;
 739 }
 740 EXPORT_SYMBOL(core_tpg_register);
 741
 742 int core_tpg_deregister(struct se_portal_group *se_tpg)
 743 {
 744         struct se_node_acl *nacl, *nacl_tmp;
 745
 746         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 747                 " for endpoint: %s Portal Tag %u\n",
 748                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 749                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 750                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 751                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 752
 753         spin_lock_bh(&tpg_lock);
 754         list_del(&se_tpg->se_tpg_node);
 755         spin_unlock_bh(&tpg_lock);
 756
 757         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 758                 cpu_relax();
 759         /*
 760          * Release any remaining demo-mode generated se_node_acl that have
 761          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 762          * in transport_deregister_session().
 763          */
 764         spin_lock_irq(&se_tpg->acl_node_lock);
 765         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 766                         acl_list) {
 767                 list_del(&nacl->acl_list);
 768                 se_tpg->num_node_acls--;
 769                 spin_unlock_irq(&se_tpg->acl_node_lock);
 770
 771                 core_tpg_wait_for_nacl_pr_ref(nacl);
 772                 core_free_device_list_for_node(nacl, se_tpg);
 773                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 774
 775                 spin_lock_irq(&se_tpg->acl_node_lock);
 776         }
 777         spin_unlock_irq(&se_tpg->acl_node_lock);
 778
 779         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 780                 core_tpg_release_virtual_lun0(se_tpg);
 781
 782         se_tpg->se_tpg_fabric_ptr = NULL;
 783         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 784         return 0;
 785 }
 786 EXPORT_SYMBOL(core_tpg_deregister);
 787
 788 struct se_lun *core_tpg_pre_addlun(
 789         struct se_portal_group *tpg,
 790         u32 unpacked_lun)
 791 {
 792         struct se_lun *lun;
 793
 794         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 795                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 796                         "-1: %u for Target Portal Group: %u\n",
 797                         tpg->se_tpg_tfo->get_fabric_name(),
 798                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 799                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 800                 return ERR_PTR(-EOVERFLOW);
 801         }
 802
 803         spin_lock(&tpg->tpg_lun_lock);
 804         lun = tpg->tpg_lun_list[unpacked_lun];
 805         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 806                 pr_err("TPG Logical Unit Number: %u is already active"
 807                         " on %s Target Portal Group: %u, ignoring request.\n",
 808                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 809                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 810                 spin_unlock(&tpg->tpg_lun_lock);
 811                 return ERR_PTR(-EINVAL);
 812         }
 813         spin_unlock(&tpg->tpg_lun_lock);
 814
 815         return lun;
 816 }
 817
 818 int core_tpg_post_addlun(
 819         struct se_portal_group *tpg,
 820         struct se_lun *lun,
 821         u32 lun_access,
 822         void *lun_ptr)
 823 {
 824         int ret;
 825
 826         ret = core_dev_export(lun_ptr, tpg, lun);
 827         if (ret < 0)
 828                 return ret;
 829
 830         spin_lock(&tpg->tpg_lun_lock);
 831         lun->lun_access = lun_access;
 832         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 833         spin_unlock(&tpg->tpg_lun_lock);
 834
 835         return 0;
 836 }
 837
 838 static void core_tpg_shutdown_lun(
 839         struct se_portal_group *tpg,
 840         struct se_lun *lun)
 841 {
 842         core_clear_lun_from_tpg(lun, tpg);
 843         transport_clear_lun_from_sessions(lun);
 844 }
 845
 846 struct se_lun *core_tpg_pre_dellun(
 847         struct se_portal_group *tpg,
 848         u32 unpacked_lun)
 849 {
 850         struct se_lun *lun;
 851
 852         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 853                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 854                         "-1: %u for Target Portal Group: %u\n",
 855                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 856                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 857                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 858                 return ERR_PTR(-EOVERFLOW);
 859         }
 860
 861         spin_lock(&tpg->tpg_lun_lock);
 862         lun = tpg->tpg_lun_list[unpacked_lun];
 863         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 864                 pr_err("%s Logical Unit Number: %u is not active on"
 865                         " Target Portal Group: %u, ignoring request.\n",
 866                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 867                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 868                 spin_unlock(&tpg->tpg_lun_lock);
 869                 return ERR_PTR(-ENODEV);
 870         }
 871         spin_unlock(&tpg->tpg_lun_lock);
 872
 873         return lun;
 874 }
 875
 876 int core_tpg_post_dellun(
 877         struct se_portal_group *tpg,
 878         struct se_lun *lun)
 879 {
 880         core_tpg_shutdown_lun(tpg, lun);
 881
 882         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 883
 884         spin_lock(&tpg->tpg_lun_lock);
 885         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 886         spin_unlock(&tpg->tpg_lun_lock);
 887
 888         return 0;
 889 }