drivers/target/target_core_tpg.c

   1 /*******************************************************************************
   2  * Filename:  target_core_tpg.c
   3  *
   4  * This file contains generic Target Portal Group related functions.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/string.h>
  31 #include <linux/timer.h>
  32 #include <linux/slab.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <net/sock.h>
  37 #include <net/tcp.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_backend.h>
  43 #include <target/target_core_fabric.h>
  44
  45 #include "target_core_internal.h"
  46
  47 extern struct se_device *g_lun0_dev;
  48
  49 static DEFINE_SPINLOCK(tpg_lock);
  50 static LIST_HEAD(tpg_list);
  51
  52 /*      core_clear_initiator_node_from_tpg():
  53  *
  54  *
  55  */
  56 static void core_clear_initiator_node_from_tpg(
  57         struct se_node_acl *nacl,
  58         struct se_portal_group *tpg)
  59 {
  60         int i;
  61         struct se_dev_entry *deve;
  62         struct se_lun *lun;
  63
  64         spin_lock_irq(&nacl->device_list_lock);
  65         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  66                 deve = nacl->device_list[i];
  67
  68                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  69                         continue;
  70
  71                 if (!deve->se_lun) {
  72                         pr_err("%s device entries device pointer is"
  73                                 " NULL, but Initiator has access.\n",
  74                                 tpg->se_tpg_tfo->get_fabric_name());
  75                         continue;
  76                 }
  77
  78                 lun = deve->se_lun;
  79                 spin_unlock_irq(&nacl->device_list_lock);
  80                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  81                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  82
  83                 spin_lock_irq(&nacl->device_list_lock);
  84         }
  85         spin_unlock_irq(&nacl->device_list_lock);
  86 }
  87
  88 /*      __core_tpg_get_initiator_node_acl():
  89  *
  90  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  91  */
  92 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  93         struct se_portal_group *tpg,
  94         const char *initiatorname)
  95 {
  96         struct se_node_acl *acl;
  97
  98         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  99                 if (!strcmp(acl->initiatorname, initiatorname))
 100                         return acl;
 101         }
 102
 103         return NULL;
 104 }
 105
 106 /*      core_tpg_get_initiator_node_acl():
 107  *
 108  *
 109  */
 110 struct se_node_acl *core_tpg_get_initiator_node_acl(
 111         struct se_portal_group *tpg,
 112         unsigned char *initiatorname)
 113 {
 114         struct se_node_acl *acl;
 115
 116         spin_lock_irq(&tpg->acl_node_lock);
 117         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 118                 if (!strcmp(acl->initiatorname, initiatorname) &&
 119                     !acl->dynamic_node_acl) {
 120                         spin_unlock_irq(&tpg->acl_node_lock);
 121                         return acl;
 122                 }
 123         }
 124         spin_unlock_irq(&tpg->acl_node_lock);
 125
 126         return NULL;
 127 }
 128
 129 /*      core_tpg_add_node_to_devs():
 130  *
 131  *
 132  */
 133 void core_tpg_add_node_to_devs(
 134         struct se_node_acl *acl,
 135         struct se_portal_group *tpg)
 136 {
 137         int i = 0;
 138         u32 lun_access = 0;
 139         struct se_lun *lun;
 140         struct se_device *dev;
 141
 142         spin_lock(&tpg->tpg_lun_lock);
 143         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 144                 lun = tpg->tpg_lun_list[i];
 145                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 146                         continue;
 147
 148                 spin_unlock(&tpg->tpg_lun_lock);
 149
 150                 dev = lun->lun_se_dev;
 151                 /*
 152                  * By default in LIO-Target $FABRIC_MOD,
 153                  * demo_mode_write_protect is ON, or READ_ONLY;
 154                  */
 155                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 156                         if (dev->dev_flags & DF_READ_ONLY)
 157                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 158                         else
 159                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 160                 } else {
 161                         /*
 162                          * Allow only optical drives to issue R/W in default RO
 163                          * demo mode.
 164                          */
 165                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 166                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 167                         else
 168                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 169                 }
 170
 171                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 172                         " access for LUN in Demo Mode\n",
 173                         tpg->se_tpg_tfo->get_fabric_name(),
 174                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 175                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 176                         "READ-WRITE" : "READ-ONLY");
 177
 178                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 179                                 lun_access, acl, tpg, 1);
 180                 spin_lock(&tpg->tpg_lun_lock);
 181         }
 182         spin_unlock(&tpg->tpg_lun_lock);
 183 }
 184
 185 /*      core_set_queue_depth_for_node():
 186  *
 187  *
 188  */
 189 static int core_set_queue_depth_for_node(
 190         struct se_portal_group *tpg,
 191         struct se_node_acl *acl)
 192 {
 193         if (!acl->queue_depth) {
 194                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 195                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 196                         acl->initiatorname);
 197                 acl->queue_depth = 1;
 198         }
 199
 200         return 0;
 201 }
 202
 203 void array_free(void *array, int n)
 204 {
 205         void **a = array;
 206         int i;
 207
 208         for (i = 0; i < n; i++)
 209                 kfree(a[i]);
 210         kfree(a);
 211 }
 212
 213 static void *array_zalloc(int n, size_t size, gfp_t flags)
 214 {
 215         void **a;
 216         int i;
 217
 218         a = kzalloc(n * sizeof(void*), flags);
 219         if (!a)
 220                 return NULL;
 221         for (i = 0; i < n; i++) {
 222                 a[i] = kzalloc(size, flags);
 223                 if (!a[i]) {
 224                         array_free(a, n);
 225                         return NULL;
 226                 }
 227         }
 228         return a;
 229 }
 230
 231 /*      core_create_device_list_for_node():
 232  *
 233  *
 234  */
 235 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 236 {
 237         struct se_dev_entry *deve;
 238         int i;
 239
 240         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 241                         sizeof(struct se_dev_entry), GFP_KERNEL);
 242         if (!nacl->device_list) {
 243                 pr_err("Unable to allocate memory for"
 244                         " struct se_node_acl->device_list\n");
 245                 return -ENOMEM;
 246         }
 247         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 248                 deve = nacl->device_list[i];
 249
 250                 atomic_set(&deve->ua_count, 0);
 251                 atomic_set(&deve->pr_ref_count, 0);
 252                 spin_lock_init(&deve->ua_lock);
 253                 INIT_LIST_HEAD(&deve->alua_port_list);
 254                 INIT_LIST_HEAD(&deve->ua_list);
 255         }
 256
 257         return 0;
 258 }
 259
 260 /*      core_tpg_check_initiator_node_acl()
 261  *
 262  *
 263  */
 264 struct se_node_acl *core_tpg_check_initiator_node_acl(
 265         struct se_portal_group *tpg,
 266         unsigned char *initiatorname)
 267 {
 268         struct se_node_acl *acl;
 269
 270         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 271         if (acl)
 272                 return acl;
 273
 274         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 275                 return NULL;
 276
 277         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 278         if (!acl)
 279                 return NULL;
 280
 281         INIT_LIST_HEAD(&acl->acl_list);
 282         INIT_LIST_HEAD(&acl->acl_sess_list);
 283         kref_init(&acl->acl_kref);
 284         init_completion(&acl->acl_free_comp);
 285         spin_lock_init(&acl->device_list_lock);
 286         spin_lock_init(&acl->nacl_sess_lock);
 287         atomic_set(&acl->acl_pr_ref_count, 0);
 288         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 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         spin_lock_init(&acl->stats_lock);
 293         acl->dynamic_node_acl = 1;
 294
 295         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 296
 297         if (core_create_device_list_for_node(acl) < 0) {
 298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 299                 return NULL;
 300         }
 301
 302         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 303                 core_free_device_list_for_node(acl, tpg);
 304                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 305                 return NULL;
 306         }
 307         /*
 308          * Here we only create demo-mode MappedLUNs from the active
 309          * TPG LUNs if the fabric is not explictly asking for
 310          * tpg_check_demo_mode_login_only() == 1.
 311          */
 312         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 313             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 314                 do { ; } while (0);
 315         else
 316                 core_tpg_add_node_to_devs(acl, tpg);
 317
 318         spin_lock_irq(&tpg->acl_node_lock);
 319         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 320         tpg->num_node_acls++;
 321         spin_unlock_irq(&tpg->acl_node_lock);
 322
 323         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 324                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 325                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 326                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 327
 328         return acl;
 329 }
 330 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 331
 332 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 333 {
 334         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 335                 cpu_relax();
 336 }
 337
 338 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 339 {
 340         int i;
 341         struct se_lun *lun;
 342
 343         spin_lock(&tpg->tpg_lun_lock);
 344         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 345                 lun = tpg->tpg_lun_list[i];
 346
 347                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 348                     (lun->lun_se_dev == NULL))
 349                         continue;
 350
 351                 spin_unlock(&tpg->tpg_lun_lock);
 352                 core_dev_del_lun(tpg, lun->unpacked_lun);
 353                 spin_lock(&tpg->tpg_lun_lock);
 354         }
 355         spin_unlock(&tpg->tpg_lun_lock);
 356 }
 357 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 358
 359 /*      core_tpg_add_initiator_node_acl():
 360  *
 361  *
 362  */
 363 struct se_node_acl *core_tpg_add_initiator_node_acl(
 364         struct se_portal_group *tpg,
 365         struct se_node_acl *se_nacl,
 366         const char *initiatorname,
 367         u32 queue_depth)
 368 {
 369         struct se_node_acl *acl = NULL;
 370
 371         spin_lock_irq(&tpg->acl_node_lock);
 372         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 373         if (acl) {
 374                 if (acl->dynamic_node_acl) {
 375                         acl->dynamic_node_acl = 0;
 376                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 377                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 378                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 379                         spin_unlock_irq(&tpg->acl_node_lock);
 380                         /*
 381                          * Release the locally allocated struct se_node_acl
 382                          * because * core_tpg_add_initiator_node_acl() returned
 383                          * a pointer to an existing demo mode node ACL.
 384                          */
 385                         if (se_nacl)
 386                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 387                                                         se_nacl);
 388                         goto done;
 389                 }
 390
 391                 pr_err("ACL entry for %s Initiator"
 392                         " Node %s already exists for TPG %u, ignoring"
 393                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 394                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 395                 spin_unlock_irq(&tpg->acl_node_lock);
 396                 return ERR_PTR(-EEXIST);
 397         }
 398         spin_unlock_irq(&tpg->acl_node_lock);
 399
 400         if (!se_nacl) {
 401                 pr_err("struct se_node_acl pointer is NULL\n");
 402                 return ERR_PTR(-EINVAL);
 403         }
 404         /*
 405          * For v4.x logic the se_node_acl_s is hanging off a fabric
 406          * dependent structure allocated via
 407          * struct target_core_fabric_ops->fabric_make_nodeacl()
 408          */
 409         acl = se_nacl;
 410
 411         INIT_LIST_HEAD(&acl->acl_list);
 412         INIT_LIST_HEAD(&acl->acl_sess_list);
 413         kref_init(&acl->acl_kref);
 414         init_completion(&acl->acl_free_comp);
 415         spin_lock_init(&acl->device_list_lock);
 416         spin_lock_init(&acl->nacl_sess_lock);
 417         atomic_set(&acl->acl_pr_ref_count, 0);
 418         acl->queue_depth = queue_depth;
 419         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 420         acl->se_tpg = tpg;
 421         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 422         spin_lock_init(&acl->stats_lock);
 423
 424         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 425
 426         if (core_create_device_list_for_node(acl) < 0) {
 427                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 428                 return ERR_PTR(-ENOMEM);
 429         }
 430
 431         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 432                 core_free_device_list_for_node(acl, tpg);
 433                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 434                 return ERR_PTR(-EINVAL);
 435         }
 436
 437         spin_lock_irq(&tpg->acl_node_lock);
 438         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 439         tpg->num_node_acls++;
 440         spin_unlock_irq(&tpg->acl_node_lock);
 441
 442 done:
 443         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 444                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 445                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 446                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 447
 448         return acl;
 449 }
 450 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 451
 452 /*      core_tpg_del_initiator_node_acl():
 453  *
 454  *
 455  */
 456 int core_tpg_del_initiator_node_acl(
 457         struct se_portal_group *tpg,
 458         struct se_node_acl *acl,
 459         int force)
 460 {
 461         LIST_HEAD(sess_list);
 462         struct se_session *sess, *sess_tmp;
 463         unsigned long flags;
 464         int rc;
 465
 466         spin_lock_irq(&tpg->acl_node_lock);
 467         if (acl->dynamic_node_acl) {
 468                 acl->dynamic_node_acl = 0;
 469         }
 470         list_del(&acl->acl_list);
 471         tpg->num_node_acls--;
 472         spin_unlock_irq(&tpg->acl_node_lock);
 473
 474         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 475         acl->acl_stop = 1;
 476
 477         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 478                                 sess_acl_list) {
 479                 if (sess->sess_tearing_down != 0)
 480                         continue;
 481
 482                 target_get_session(sess);
 483                 list_move(&sess->sess_acl_list, &sess_list);
 484         }
 485         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 486
 487         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 488                 list_del(&sess->sess_acl_list);
 489
 490                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 491                 target_put_session(sess);
 492                 if (!rc)
 493                         continue;
 494                 target_put_session(sess);
 495         }
 496         target_put_nacl(acl);
 497         /*
 498          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 499          * for active fabric session transport_deregister_session() callbacks.
 500          */
 501         wait_for_completion(&acl->acl_free_comp);
 502
 503         core_tpg_wait_for_nacl_pr_ref(acl);
 504         core_clear_initiator_node_from_tpg(acl, tpg);
 505         core_free_device_list_for_node(acl, tpg);
 506
 507         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 508                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 509                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 510                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 511
 512         return 0;
 513 }
 514 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 515
 516 /*      core_tpg_set_initiator_node_queue_depth():
 517  *
 518  *
 519  */
 520 int core_tpg_set_initiator_node_queue_depth(
 521         struct se_portal_group *tpg,
 522         unsigned char *initiatorname,
 523         u32 queue_depth,
 524         int force)
 525 {
 526         struct se_session *sess, *init_sess = NULL;
 527         struct se_node_acl *acl;
 528         unsigned long flags;
 529         int dynamic_acl = 0;
 530
 531         spin_lock_irq(&tpg->acl_node_lock);
 532         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 533         if (!acl) {
 534                 pr_err("Access Control List entry for %s Initiator"
 535                         " Node %s does not exists for TPG %hu, ignoring"
 536                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 537                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 538                 spin_unlock_irq(&tpg->acl_node_lock);
 539                 return -ENODEV;
 540         }
 541         if (acl->dynamic_node_acl) {
 542                 acl->dynamic_node_acl = 0;
 543                 dynamic_acl = 1;
 544         }
 545         spin_unlock_irq(&tpg->acl_node_lock);
 546
 547         spin_lock_irqsave(&tpg->session_lock, flags);
 548         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 549                 if (sess->se_node_acl != acl)
 550                         continue;
 551
 552                 if (!force) {
 553                         pr_err("Unable to change queue depth for %s"
 554                                 " Initiator Node: %s while session is"
 555                                 " operational.  To forcefully change the queue"
 556                                 " depth and force session reinstatement"
 557                                 " use the \"force=1\" parameter.\n",
 558                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 559                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 560
 561                         spin_lock_irq(&tpg->acl_node_lock);
 562                         if (dynamic_acl)
 563                                 acl->dynamic_node_acl = 1;
 564                         spin_unlock_irq(&tpg->acl_node_lock);
 565                         return -EEXIST;
 566                 }
 567                 /*
 568                  * Determine if the session needs to be closed by our context.
 569                  */
 570                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 571                         continue;
 572
 573                 init_sess = sess;
 574                 break;
 575         }
 576
 577         /*
 578          * User has requested to change the queue depth for a Initiator Node.
 579          * Change the value in the Node's struct se_node_acl, and call
 580          * core_set_queue_depth_for_node() to add the requested queue depth.
 581          *
 582          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 583          * reinstatement to occur if there is an active session for the
 584          * $FABRIC_MOD Initiator Node in question.
 585          */
 586         acl->queue_depth = queue_depth;
 587
 588         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 589                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 590                 /*
 591                  * Force session reinstatement if
 592                  * core_set_queue_depth_for_node() failed, because we assume
 593                  * the $FABRIC_MOD has already the set session reinstatement
 594                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 595                  */
 596                 if (init_sess)
 597                         tpg->se_tpg_tfo->close_session(init_sess);
 598
 599                 spin_lock_irq(&tpg->acl_node_lock);
 600                 if (dynamic_acl)
 601                         acl->dynamic_node_acl = 1;
 602                 spin_unlock_irq(&tpg->acl_node_lock);
 603                 return -EINVAL;
 604         }
 605         spin_unlock_irqrestore(&tpg->session_lock, flags);
 606         /*
 607          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 608          * forcefully shutdown the $FABRIC_MOD session/nexus.
 609          */
 610         if (init_sess)
 611                 tpg->se_tpg_tfo->close_session(init_sess);
 612
 613         pr_debug("Successfully changed queue depth to: %d for Initiator"
 614                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 615                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 616                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 617
 618         spin_lock_irq(&tpg->acl_node_lock);
 619         if (dynamic_acl)
 620                 acl->dynamic_node_acl = 1;
 621         spin_unlock_irq(&tpg->acl_node_lock);
 622
 623         return 0;
 624 }
 625 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 626
 627 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 628 {
 629         /* Set in core_dev_setup_virtual_lun0() */
 630         struct se_device *dev = g_lun0_dev;
 631         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 632         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 633         int ret;
 634
 635         lun->unpacked_lun = 0;
 636         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 637         atomic_set(&lun->lun_acl_count, 0);
 638         init_completion(&lun->lun_shutdown_comp);
 639         INIT_LIST_HEAD(&lun->lun_acl_list);
 640         INIT_LIST_HEAD(&lun->lun_cmd_list);
 641         spin_lock_init(&lun->lun_acl_lock);
 642         spin_lock_init(&lun->lun_cmd_lock);
 643         spin_lock_init(&lun->lun_sep_lock);
 644
 645         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 646         if (ret < 0)
 647                 return ret;
 648
 649         return 0;
 650 }
 651
 652 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 653 {
 654         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 655
 656         core_tpg_post_dellun(se_tpg, lun);
 657 }
 658
 659 int core_tpg_register(
 660         struct target_core_fabric_ops *tfo,
 661         struct se_wwn *se_wwn,
 662         struct se_portal_group *se_tpg,
 663         void *tpg_fabric_ptr,
 664         int se_tpg_type)
 665 {
 666         struct se_lun *lun;
 667         u32 i;
 668
 669         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 670                         sizeof(struct se_lun), GFP_KERNEL);
 671         if (!se_tpg->tpg_lun_list) {
 672                 pr_err("Unable to allocate struct se_portal_group->"
 673                                 "tpg_lun_list\n");
 674                 return -ENOMEM;
 675         }
 676
 677         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 678                 lun = se_tpg->tpg_lun_list[i];
 679                 lun->unpacked_lun = i;
 680                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 681                 atomic_set(&lun->lun_acl_count, 0);
 682                 init_completion(&lun->lun_shutdown_comp);
 683                 INIT_LIST_HEAD(&lun->lun_acl_list);
 684                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 685                 spin_lock_init(&lun->lun_acl_lock);
 686                 spin_lock_init(&lun->lun_cmd_lock);
 687                 spin_lock_init(&lun->lun_sep_lock);
 688         }
 689
 690         se_tpg->se_tpg_type = se_tpg_type;
 691         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 692         se_tpg->se_tpg_tfo = tfo;
 693         se_tpg->se_tpg_wwn = se_wwn;
 694         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 695         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 696         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 697         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 698         spin_lock_init(&se_tpg->acl_node_lock);
 699         spin_lock_init(&se_tpg->session_lock);
 700         spin_lock_init(&se_tpg->tpg_lun_lock);
 701
 702         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 703                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 704                         kfree(se_tpg);
 705                         return -ENOMEM;
 706                 }
 707         }
 708
 709         spin_lock_bh(&tpg_lock);
 710         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 711         spin_unlock_bh(&tpg_lock);
 712
 713         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 714                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 715                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 716                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 717                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 718
 719         return 0;
 720 }
 721 EXPORT_SYMBOL(core_tpg_register);
 722
 723 int core_tpg_deregister(struct se_portal_group *se_tpg)
 724 {
 725         struct se_node_acl *nacl, *nacl_tmp;
 726
 727         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 728                 " for endpoint: %s Portal Tag %u\n",
 729                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 730                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 731                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 732                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 733
 734         spin_lock_bh(&tpg_lock);
 735         list_del(&se_tpg->se_tpg_node);
 736         spin_unlock_bh(&tpg_lock);
 737
 738         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 739                 cpu_relax();
 740         /*
 741          * Release any remaining demo-mode generated se_node_acl that have
 742          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 743          * in transport_deregister_session().
 744          */
 745         spin_lock_irq(&se_tpg->acl_node_lock);
 746         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 747                         acl_list) {
 748                 list_del(&nacl->acl_list);
 749                 se_tpg->num_node_acls--;
 750                 spin_unlock_irq(&se_tpg->acl_node_lock);
 751
 752                 core_tpg_wait_for_nacl_pr_ref(nacl);
 753                 core_free_device_list_for_node(nacl, se_tpg);
 754                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 755
 756                 spin_lock_irq(&se_tpg->acl_node_lock);
 757         }
 758         spin_unlock_irq(&se_tpg->acl_node_lock);
 759
 760         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 761                 core_tpg_release_virtual_lun0(se_tpg);
 762
 763         se_tpg->se_tpg_fabric_ptr = NULL;
 764         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 765         return 0;
 766 }
 767 EXPORT_SYMBOL(core_tpg_deregister);
 768
 769 struct se_lun *core_tpg_pre_addlun(
 770         struct se_portal_group *tpg,
 771         u32 unpacked_lun)
 772 {
 773         struct se_lun *lun;
 774
 775         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 776                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 777                         "-1: %u for Target Portal Group: %u\n",
 778                         tpg->se_tpg_tfo->get_fabric_name(),
 779                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 780                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 781                 return ERR_PTR(-EOVERFLOW);
 782         }
 783
 784         spin_lock(&tpg->tpg_lun_lock);
 785         lun = tpg->tpg_lun_list[unpacked_lun];
 786         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 787                 pr_err("TPG Logical Unit Number: %u is already active"
 788                         " on %s Target Portal Group: %u, ignoring request.\n",
 789                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 790                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 791                 spin_unlock(&tpg->tpg_lun_lock);
 792                 return ERR_PTR(-EINVAL);
 793         }
 794         spin_unlock(&tpg->tpg_lun_lock);
 795
 796         return lun;
 797 }
 798
 799 int core_tpg_post_addlun(
 800         struct se_portal_group *tpg,
 801         struct se_lun *lun,
 802         u32 lun_access,
 803         void *lun_ptr)
 804 {
 805         int ret;
 806
 807         ret = core_dev_export(lun_ptr, tpg, lun);
 808         if (ret < 0)
 809                 return ret;
 810
 811         spin_lock(&tpg->tpg_lun_lock);
 812         lun->lun_access = lun_access;
 813         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 814         spin_unlock(&tpg->tpg_lun_lock);
 815
 816         return 0;
 817 }
 818
 819 static void core_tpg_shutdown_lun(
 820         struct se_portal_group *tpg,
 821         struct se_lun *lun)
 822 {
 823         core_clear_lun_from_tpg(lun, tpg);
 824         transport_clear_lun_from_sessions(lun);
 825 }
 826
 827 struct se_lun *core_tpg_pre_dellun(
 828         struct se_portal_group *tpg,
 829         u32 unpacked_lun)
 830 {
 831         struct se_lun *lun;
 832
 833         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 834                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 835                         "-1: %u for Target Portal Group: %u\n",
 836                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 837                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 838                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 839                 return ERR_PTR(-EOVERFLOW);
 840         }
 841
 842         spin_lock(&tpg->tpg_lun_lock);
 843         lun = tpg->tpg_lun_list[unpacked_lun];
 844         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 845                 pr_err("%s Logical Unit Number: %u is not active on"
 846                         " Target Portal Group: %u, ignoring request.\n",
 847                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 848                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 849                 spin_unlock(&tpg->tpg_lun_lock);
 850                 return ERR_PTR(-ENODEV);
 851         }
 852         spin_unlock(&tpg->tpg_lun_lock);
 853
 854         return lun;
 855 }
 856
 857 int core_tpg_post_dellun(
 858         struct se_portal_group *tpg,
 859         struct se_lun *lun)
 860 {
 861         core_tpg_shutdown_lun(tpg, lun);
 862
 863         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 864
 865         spin_lock(&tpg->tpg_lun_lock);
 866         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 867         spin_unlock(&tpg->tpg_lun_lock);
 868
 869         return 0;
 870 }