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         if (tpg->se_tpg_tfo->tpg_get_default_depth)
 286                 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 287         else
 288                 acl->queue_depth = 1;
 289         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 290         acl->se_tpg = tpg;
 291         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 292         acl->dynamic_node_acl = 1;
 293
 294         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 295
 296         if (core_create_device_list_for_node(acl) < 0) {
 297                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 298                 return NULL;
 299         }
 300
 301         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 302                 core_free_device_list_for_node(acl, tpg);
 303                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 304                 return NULL;
 305         }
 306         /*
 307          * Here we only create demo-mode MappedLUNs from the active
 308          * TPG LUNs if the fabric is not explicitly asking for
 309          * tpg_check_demo_mode_login_only() == 1.
 310          */
 311         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 312             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 313                 core_tpg_add_node_to_devs(acl, tpg);
 314
 315         spin_lock_irq(&tpg->acl_node_lock);
 316         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 317         tpg->num_node_acls++;
 318         spin_unlock_irq(&tpg->acl_node_lock);
 319
 320         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 321                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 322                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 323                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 324
 325         return acl;
 326 }
 327 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 328
 329 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 330 {
 331         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 332                 cpu_relax();
 333 }
 334
 335 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 336 {
 337         int i;
 338         struct se_lun *lun;
 339
 340         spin_lock(&tpg->tpg_lun_lock);
 341         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 342                 lun = tpg->tpg_lun_list[i];
 343
 344                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 345                     (lun->lun_se_dev == NULL))
 346                         continue;
 347
 348                 spin_unlock(&tpg->tpg_lun_lock);
 349                 core_dev_del_lun(tpg, lun);
 350                 spin_lock(&tpg->tpg_lun_lock);
 351         }
 352         spin_unlock(&tpg->tpg_lun_lock);
 353 }
 354 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 355
 356 /*      core_tpg_add_initiator_node_acl():
 357  *
 358  *
 359  */
 360 struct se_node_acl *core_tpg_add_initiator_node_acl(
 361         struct se_portal_group *tpg,
 362         struct se_node_acl *se_nacl,
 363         const char *initiatorname,
 364         u32 queue_depth)
 365 {
 366         struct se_node_acl *acl = NULL;
 367
 368         spin_lock_irq(&tpg->acl_node_lock);
 369         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 370         if (acl) {
 371                 if (acl->dynamic_node_acl) {
 372                         acl->dynamic_node_acl = 0;
 373                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 374                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 375                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 376                         spin_unlock_irq(&tpg->acl_node_lock);
 377                         /*
 378                          * Release the locally allocated struct se_node_acl
 379                          * because * core_tpg_add_initiator_node_acl() returned
 380                          * a pointer to an existing demo mode node ACL.
 381                          */
 382                         if (se_nacl)
 383                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 384                                                         se_nacl);
 385                         goto done;
 386                 }
 387
 388                 pr_err("ACL entry for %s Initiator"
 389                         " Node %s already exists for TPG %u, ignoring"
 390                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 391                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 392                 spin_unlock_irq(&tpg->acl_node_lock);
 393                 return ERR_PTR(-EEXIST);
 394         }
 395         spin_unlock_irq(&tpg->acl_node_lock);
 396
 397         if (!se_nacl) {
 398                 pr_err("struct se_node_acl pointer is NULL\n");
 399                 return ERR_PTR(-EINVAL);
 400         }
 401         /*
 402          * For v4.x logic the se_node_acl_s is hanging off a fabric
 403          * dependent structure allocated via
 404          * struct target_core_fabric_ops->fabric_make_nodeacl()
 405          */
 406         acl = se_nacl;
 407
 408         INIT_LIST_HEAD(&acl->acl_list);
 409         INIT_LIST_HEAD(&acl->acl_sess_list);
 410         kref_init(&acl->acl_kref);
 411         init_completion(&acl->acl_free_comp);
 412         spin_lock_init(&acl->device_list_lock);
 413         spin_lock_init(&acl->nacl_sess_lock);
 414         atomic_set(&acl->acl_pr_ref_count, 0);
 415         acl->queue_depth = queue_depth;
 416         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 417         acl->se_tpg = tpg;
 418         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 419
 420         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 421
 422         if (core_create_device_list_for_node(acl) < 0) {
 423                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 424                 return ERR_PTR(-ENOMEM);
 425         }
 426
 427         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 428                 core_free_device_list_for_node(acl, tpg);
 429                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 430                 return ERR_PTR(-EINVAL);
 431         }
 432
 433         spin_lock_irq(&tpg->acl_node_lock);
 434         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 435         tpg->num_node_acls++;
 436         spin_unlock_irq(&tpg->acl_node_lock);
 437
 438 done:
 439         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 440                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 441                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 442                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 443
 444         return acl;
 445 }
 446 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 447
 448 /*      core_tpg_del_initiator_node_acl():
 449  *
 450  *
 451  */
 452 int core_tpg_del_initiator_node_acl(
 453         struct se_portal_group *tpg,
 454         struct se_node_acl *acl,
 455         int force)
 456 {
 457         LIST_HEAD(sess_list);
 458         struct se_session *sess, *sess_tmp;
 459         unsigned long flags;
 460         int rc;
 461
 462         spin_lock_irq(&tpg->acl_node_lock);
 463         if (acl->dynamic_node_acl) {
 464                 acl->dynamic_node_acl = 0;
 465         }
 466         list_del(&acl->acl_list);
 467         tpg->num_node_acls--;
 468         spin_unlock_irq(&tpg->acl_node_lock);
 469
 470         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 471         acl->acl_stop = 1;
 472
 473         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 474                                 sess_acl_list) {
 475                 if (sess->sess_tearing_down != 0)
 476                         continue;
 477
 478                 target_get_session(sess);
 479                 list_move(&sess->sess_acl_list, &sess_list);
 480         }
 481         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 482
 483         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 484                 list_del(&sess->sess_acl_list);
 485
 486                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 487                 target_put_session(sess);
 488                 if (!rc)
 489                         continue;
 490                 target_put_session(sess);
 491         }
 492         target_put_nacl(acl);
 493         /*
 494          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 495          * for active fabric session transport_deregister_session() callbacks.
 496          */
 497         wait_for_completion(&acl->acl_free_comp);
 498
 499         core_tpg_wait_for_nacl_pr_ref(acl);
 500         core_clear_initiator_node_from_tpg(acl, tpg);
 501         core_free_device_list_for_node(acl, tpg);
 502
 503         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 504                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 505                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 506                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 507
 508         return 0;
 509 }
 510 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 511
 512 /*      core_tpg_set_initiator_node_queue_depth():
 513  *
 514  *
 515  */
 516 int core_tpg_set_initiator_node_queue_depth(
 517         struct se_portal_group *tpg,
 518         unsigned char *initiatorname,
 519         u32 queue_depth,
 520         int force)
 521 {
 522         struct se_session *sess, *init_sess = NULL;
 523         struct se_node_acl *acl;
 524         unsigned long flags;
 525         int dynamic_acl = 0;
 526
 527         spin_lock_irq(&tpg->acl_node_lock);
 528         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 529         if (!acl) {
 530                 pr_err("Access Control List entry for %s Initiator"
 531                         " Node %s does not exists for TPG %hu, ignoring"
 532                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 533                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 534                 spin_unlock_irq(&tpg->acl_node_lock);
 535                 return -ENODEV;
 536         }
 537         if (acl->dynamic_node_acl) {
 538                 acl->dynamic_node_acl = 0;
 539                 dynamic_acl = 1;
 540         }
 541         spin_unlock_irq(&tpg->acl_node_lock);
 542
 543         spin_lock_irqsave(&tpg->session_lock, flags);
 544         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 545                 if (sess->se_node_acl != acl)
 546                         continue;
 547
 548                 if (!force) {
 549                         pr_err("Unable to change queue depth for %s"
 550                                 " Initiator Node: %s while session is"
 551                                 " operational.  To forcefully change the queue"
 552                                 " depth and force session reinstatement"
 553                                 " use the \"force=1\" parameter.\n",
 554                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 555                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 556
 557                         spin_lock_irq(&tpg->acl_node_lock);
 558                         if (dynamic_acl)
 559                                 acl->dynamic_node_acl = 1;
 560                         spin_unlock_irq(&tpg->acl_node_lock);
 561                         return -EEXIST;
 562                 }
 563                 /*
 564                  * Determine if the session needs to be closed by our context.
 565                  */
 566                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 567                         continue;
 568
 569                 init_sess = sess;
 570                 break;
 571         }
 572
 573         /*
 574          * User has requested to change the queue depth for a Initiator Node.
 575          * Change the value in the Node's struct se_node_acl, and call
 576          * core_set_queue_depth_for_node() to add the requested queue depth.
 577          *
 578          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 579          * reinstatement to occur if there is an active session for the
 580          * $FABRIC_MOD Initiator Node in question.
 581          */
 582         acl->queue_depth = queue_depth;
 583
 584         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 585                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 586                 /*
 587                  * Force session reinstatement if
 588                  * core_set_queue_depth_for_node() failed, because we assume
 589                  * the $FABRIC_MOD has already the set session reinstatement
 590                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 591                  */
 592                 if (init_sess)
 593                         tpg->se_tpg_tfo->close_session(init_sess);
 594
 595                 spin_lock_irq(&tpg->acl_node_lock);
 596                 if (dynamic_acl)
 597                         acl->dynamic_node_acl = 1;
 598                 spin_unlock_irq(&tpg->acl_node_lock);
 599                 return -EINVAL;
 600         }
 601         spin_unlock_irqrestore(&tpg->session_lock, flags);
 602         /*
 603          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 604          * forcefully shutdown the $FABRIC_MOD session/nexus.
 605          */
 606         if (init_sess)
 607                 tpg->se_tpg_tfo->close_session(init_sess);
 608
 609         pr_debug("Successfully changed queue depth to: %d for Initiator"
 610                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 611                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 612                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 613
 614         spin_lock_irq(&tpg->acl_node_lock);
 615         if (dynamic_acl)
 616                 acl->dynamic_node_acl = 1;
 617         spin_unlock_irq(&tpg->acl_node_lock);
 618
 619         return 0;
 620 }
 621 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 622
 623 /*      core_tpg_set_initiator_node_tag():
 624  *
 625  *      Initiator nodeacl tags are not used internally, but may be used by
 626  *      userspace to emulate aliases or groups.
 627  *      Returns length of newly-set tag or -EINVAL.
 628  */
 629 int core_tpg_set_initiator_node_tag(
 630         struct se_portal_group *tpg,
 631         struct se_node_acl *acl,
 632         const char *new_tag)
 633 {
 634         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 635                 return -EINVAL;
 636
 637         if (!strncmp("NULL", new_tag, 4)) {
 638                 acl->acl_tag[0] = '\0';
 639                 return 0;
 640         }
 641
 642         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 643 }
 644 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 645
 646 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 647 {
 648         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 649
 650         complete(&lun->lun_ref_comp);
 651 }
 652
 653 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 654 {
 655         /* Set in core_dev_setup_virtual_lun0() */
 656         struct se_device *dev = g_lun0_dev;
 657         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 658         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 659         int ret;
 660
 661         lun->unpacked_lun = 0;
 662         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 663         atomic_set(&lun->lun_acl_count, 0);
 664         init_completion(&lun->lun_shutdown_comp);
 665         INIT_LIST_HEAD(&lun->lun_acl_list);
 666         spin_lock_init(&lun->lun_acl_lock);
 667         spin_lock_init(&lun->lun_sep_lock);
 668         init_completion(&lun->lun_ref_comp);
 669
 670         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 671         if (ret < 0)
 672                 return ret;
 673
 674         return 0;
 675 }
 676
 677 int core_tpg_register(
 678         const struct target_core_fabric_ops *tfo,
 679         struct se_wwn *se_wwn,
 680         struct se_portal_group *se_tpg,
 681         void *tpg_fabric_ptr,
 682         int se_tpg_type)
 683 {
 684         struct se_lun *lun;
 685         u32 i;
 686
 687         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 688                         sizeof(struct se_lun), GFP_KERNEL);
 689         if (!se_tpg->tpg_lun_list) {
 690                 pr_err("Unable to allocate struct se_portal_group->"
 691                                 "tpg_lun_list\n");
 692                 return -ENOMEM;
 693         }
 694
 695         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 696                 lun = se_tpg->tpg_lun_list[i];
 697                 lun->unpacked_lun = i;
 698                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 699                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 700                 atomic_set(&lun->lun_acl_count, 0);
 701                 init_completion(&lun->lun_shutdown_comp);
 702                 INIT_LIST_HEAD(&lun->lun_acl_list);
 703                 spin_lock_init(&lun->lun_acl_lock);
 704                 spin_lock_init(&lun->lun_sep_lock);
 705                 init_completion(&lun->lun_ref_comp);
 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_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
 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_alloc_lun(
 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_add_lun(
 819         struct se_portal_group *tpg,
 820         struct se_lun *lun,
 821         u32 lun_access,
 822         struct se_device *dev)
 823 {
 824         int ret;
 825
 826         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 827                               GFP_KERNEL);
 828         if (ret < 0)
 829                 return ret;
 830
 831         ret = core_dev_export(dev, tpg, lun);
 832         if (ret < 0) {
 833                 percpu_ref_exit(&lun->lun_ref);
 834                 return ret;
 835         }
 836
 837         spin_lock(&tpg->tpg_lun_lock);
 838         lun->lun_access = lun_access;
 839         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 840         spin_unlock(&tpg->tpg_lun_lock);
 841
 842         return 0;
 843 }
 844
 845 void core_tpg_remove_lun(
 846         struct se_portal_group *tpg,
 847         struct se_lun *lun)
 848 {
 849         core_clear_lun_from_tpg(lun, tpg);
 850         transport_clear_lun_ref(lun);
 851
 852         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 853
 854         spin_lock(&tpg->tpg_lun_lock);
 855         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 856         spin_unlock(&tpg->tpg_lun_lock);
 857
 858         percpu_ref_exit(&lun->lun_ref);
 859 }