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_device.h>
  43 #include <target/target_core_tpg.h>
  44 #include <target/target_core_transport.h>
  45 #include <target/target_core_fabric_ops.h>
  46
  47 #include "target_core_hba.h"
  48 #include "target_core_stat.h"
  49
  50 extern struct se_device *g_lun0_dev;
  51
  52 static DEFINE_SPINLOCK(tpg_lock);
  53 static LIST_HEAD(tpg_list);
  54
  55 /*      core_clear_initiator_node_from_tpg():
  56  *
  57  *
  58  */
  59 static void core_clear_initiator_node_from_tpg(
  60         struct se_node_acl *nacl,
  61         struct se_portal_group *tpg)
  62 {
  63         int i;
  64         struct se_dev_entry *deve;
  65         struct se_lun *lun;
  66         struct se_lun_acl *acl, *acl_tmp;
  67
  68         spin_lock_irq(&nacl->device_list_lock);
  69         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  70                 deve = &nacl->device_list[i];
  71
  72                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  73                         continue;
  74
  75                 if (!deve->se_lun) {
  76                         pr_err("%s device entries device pointer is"
  77                                 " NULL, but Initiator has access.\n",
  78                                 tpg->se_tpg_tfo->get_fabric_name());
  79                         continue;
  80                 }
  81
  82                 lun = deve->se_lun;
  83                 spin_unlock_irq(&nacl->device_list_lock);
  84                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  85                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  86
  87                 spin_lock(&lun->lun_acl_lock);
  88                 list_for_each_entry_safe(acl, acl_tmp,
  89                                         &lun->lun_acl_list, lacl_list) {
  90                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
  91                             (acl->mapped_lun == deve->mapped_lun))
  92                                 break;
  93                 }
  94
  95                 if (!acl) {
  96                         pr_err("Unable to locate struct se_lun_acl for %s,"
  97                                 " mapped_lun: %u\n", nacl->initiatorname,
  98                                 deve->mapped_lun);
  99                         spin_unlock(&lun->lun_acl_lock);
 100                         spin_lock_irq(&nacl->device_list_lock);
 101                         continue;
 102                 }
 103
 104                 list_del(&acl->lacl_list);
 105                 spin_unlock(&lun->lun_acl_lock);
 106
 107                 spin_lock_irq(&nacl->device_list_lock);
 108                 kfree(acl);
 109         }
 110         spin_unlock_irq(&nacl->device_list_lock);
 111 }
 112
 113 /*      __core_tpg_get_initiator_node_acl():
 114  *
 115  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 116  */
 117 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 118         struct se_portal_group *tpg,
 119         const char *initiatorname)
 120 {
 121         struct se_node_acl *acl;
 122
 123         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 124                 if (!strcmp(acl->initiatorname, initiatorname))
 125                         return acl;
 126         }
 127
 128         return NULL;
 129 }
 130
 131 /*      core_tpg_get_initiator_node_acl():
 132  *
 133  *
 134  */
 135 struct se_node_acl *core_tpg_get_initiator_node_acl(
 136         struct se_portal_group *tpg,
 137         unsigned char *initiatorname)
 138 {
 139         struct se_node_acl *acl;
 140
 141         spin_lock_irq(&tpg->acl_node_lock);
 142         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 143                 if (!strcmp(acl->initiatorname, initiatorname) &&
 144                     !acl->dynamic_node_acl) {
 145                         spin_unlock_irq(&tpg->acl_node_lock);
 146                         return acl;
 147                 }
 148         }
 149         spin_unlock_irq(&tpg->acl_node_lock);
 150
 151         return NULL;
 152 }
 153
 154 /*      core_tpg_add_node_to_devs():
 155  *
 156  *
 157  */
 158 void core_tpg_add_node_to_devs(
 159         struct se_node_acl *acl,
 160         struct se_portal_group *tpg)
 161 {
 162         int i = 0;
 163         u32 lun_access = 0;
 164         struct se_lun *lun;
 165         struct se_device *dev;
 166
 167         spin_lock(&tpg->tpg_lun_lock);
 168         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 169                 lun = &tpg->tpg_lun_list[i];
 170                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 171                         continue;
 172
 173                 spin_unlock(&tpg->tpg_lun_lock);
 174
 175                 dev = lun->lun_se_dev;
 176                 /*
 177                  * By default in LIO-Target $FABRIC_MOD,
 178                  * demo_mode_write_protect is ON, or READ_ONLY;
 179                  */
 180                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 181                         if (dev->dev_flags & DF_READ_ONLY)
 182                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 183                         else
 184                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 185                 } else {
 186                         /*
 187                          * Allow only optical drives to issue R/W in default RO
 188                          * demo mode.
 189                          */
 190                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 191                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 192                         else
 193                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 194                 }
 195
 196                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 197                         " access for LUN in Demo Mode\n",
 198                         tpg->se_tpg_tfo->get_fabric_name(),
 199                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 200                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 201                         "READ-WRITE" : "READ-ONLY");
 202
 203                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 204                                 lun_access, acl, tpg, 1);
 205                 spin_lock(&tpg->tpg_lun_lock);
 206         }
 207         spin_unlock(&tpg->tpg_lun_lock);
 208 }
 209
 210 /*      core_set_queue_depth_for_node():
 211  *
 212  *
 213  */
 214 static int core_set_queue_depth_for_node(
 215         struct se_portal_group *tpg,
 216         struct se_node_acl *acl)
 217 {
 218         if (!acl->queue_depth) {
 219                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 220                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 221                         acl->initiatorname);
 222                 acl->queue_depth = 1;
 223         }
 224
 225         return 0;
 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 = kzalloc(sizeof(struct se_dev_entry) *
 238                                 TRANSPORT_MAX_LUNS_PER_TPG, 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         spin_lock_init(&acl->device_list_lock);
 281         spin_lock_init(&acl->nacl_sess_lock);
 282         atomic_set(&acl->acl_pr_ref_count, 0);
 283         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 284         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 285         acl->se_tpg = tpg;
 286         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 287         spin_lock_init(&acl->stats_lock);
 288         acl->dynamic_node_acl = 1;
 289
 290         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 291
 292         if (core_create_device_list_for_node(acl) < 0) {
 293                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 294                 return NULL;
 295         }
 296
 297         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 298                 core_free_device_list_for_node(acl, tpg);
 299                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 300                 return NULL;
 301         }
 302         /*
 303          * Here we only create demo-mode MappedLUNs from the active
 304          * TPG LUNs if the fabric is not explictly asking for
 305          * tpg_check_demo_mode_login_only() == 1.
 306          */
 307         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 308             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 309                 do { ; } while (0);
 310         else
 311                 core_tpg_add_node_to_devs(acl, tpg);
 312
 313         spin_lock_irq(&tpg->acl_node_lock);
 314         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 315         tpg->num_node_acls++;
 316         spin_unlock_irq(&tpg->acl_node_lock);
 317
 318         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 319                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 320                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 321                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 322
 323         return acl;
 324 }
 325 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 326
 327 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 328 {
 329         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 330                 cpu_relax();
 331 }
 332
 333 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 334 {
 335         int i, ret;
 336         struct se_lun *lun;
 337
 338         spin_lock(&tpg->tpg_lun_lock);
 339         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 340                 lun = &tpg->tpg_lun_list[i];
 341
 342                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 343                     (lun->lun_se_dev == NULL))
 344                         continue;
 345
 346                 spin_unlock(&tpg->tpg_lun_lock);
 347                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 348                 spin_lock(&tpg->tpg_lun_lock);
 349         }
 350         spin_unlock(&tpg->tpg_lun_lock);
 351 }
 352 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 353
 354 /*      core_tpg_add_initiator_node_acl():
 355  *
 356  *
 357  */
 358 struct se_node_acl *core_tpg_add_initiator_node_acl(
 359         struct se_portal_group *tpg,
 360         struct se_node_acl *se_nacl,
 361         const char *initiatorname,
 362         u32 queue_depth)
 363 {
 364         struct se_node_acl *acl = NULL;
 365
 366         spin_lock_irq(&tpg->acl_node_lock);
 367         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 368         if (acl) {
 369                 if (acl->dynamic_node_acl) {
 370                         acl->dynamic_node_acl = 0;
 371                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 372                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 373                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 374                         spin_unlock_irq(&tpg->acl_node_lock);
 375                         /*
 376                          * Release the locally allocated struct se_node_acl
 377                          * because * core_tpg_add_initiator_node_acl() returned
 378                          * a pointer to an existing demo mode node ACL.
 379                          */
 380                         if (se_nacl)
 381                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 382                                                         se_nacl);
 383                         goto done;
 384                 }
 385
 386                 pr_err("ACL entry for %s Initiator"
 387                         " Node %s already exists for TPG %u, ignoring"
 388                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 389                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 390                 spin_unlock_irq(&tpg->acl_node_lock);
 391                 return ERR_PTR(-EEXIST);
 392         }
 393         spin_unlock_irq(&tpg->acl_node_lock);
 394
 395         if (!se_nacl) {
 396                 pr_err("struct se_node_acl pointer is NULL\n");
 397                 return ERR_PTR(-EINVAL);
 398         }
 399         /*
 400          * For v4.x logic the se_node_acl_s is hanging off a fabric
 401          * dependent structure allocated via
 402          * struct target_core_fabric_ops->fabric_make_nodeacl()
 403          */
 404         acl = se_nacl;
 405
 406         INIT_LIST_HEAD(&acl->acl_list);
 407         INIT_LIST_HEAD(&acl->acl_sess_list);
 408         spin_lock_init(&acl->device_list_lock);
 409         spin_lock_init(&acl->nacl_sess_lock);
 410         atomic_set(&acl->acl_pr_ref_count, 0);
 411         acl->queue_depth = queue_depth;
 412         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 413         acl->se_tpg = tpg;
 414         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 415         spin_lock_init(&acl->stats_lock);
 416
 417         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 418
 419         if (core_create_device_list_for_node(acl) < 0) {
 420                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 421                 return ERR_PTR(-ENOMEM);
 422         }
 423
 424         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 425                 core_free_device_list_for_node(acl, tpg);
 426                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 427                 return ERR_PTR(-EINVAL);
 428         }
 429
 430         spin_lock_irq(&tpg->acl_node_lock);
 431         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 432         tpg->num_node_acls++;
 433         spin_unlock_irq(&tpg->acl_node_lock);
 434
 435 done:
 436         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 437                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 438                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 439                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 440
 441         return acl;
 442 }
 443 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 444
 445 /*      core_tpg_del_initiator_node_acl():
 446  *
 447  *
 448  */
 449 int core_tpg_del_initiator_node_acl(
 450         struct se_portal_group *tpg,
 451         struct se_node_acl *acl,
 452         int force)
 453 {
 454         struct se_session *sess, *sess_tmp;
 455         int dynamic_acl = 0;
 456
 457         spin_lock_irq(&tpg->acl_node_lock);
 458         if (acl->dynamic_node_acl) {
 459                 acl->dynamic_node_acl = 0;
 460                 dynamic_acl = 1;
 461         }
 462         list_del(&acl->acl_list);
 463         tpg->num_node_acls--;
 464         spin_unlock_irq(&tpg->acl_node_lock);
 465
 466         spin_lock_bh(&tpg->session_lock);
 467         list_for_each_entry_safe(sess, sess_tmp,
 468                                 &tpg->tpg_sess_list, sess_list) {
 469                 if (sess->se_node_acl != acl)
 470                         continue;
 471                 /*
 472                  * Determine if the session needs to be closed by our context.
 473                  */
 474                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 475                         continue;
 476
 477                 spin_unlock_bh(&tpg->session_lock);
 478                 /*
 479                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 480                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 481                  */
 482                 tpg->se_tpg_tfo->close_session(sess);
 483
 484                 spin_lock_bh(&tpg->session_lock);
 485         }
 486         spin_unlock_bh(&tpg->session_lock);
 487
 488         core_tpg_wait_for_nacl_pr_ref(acl);
 489         core_clear_initiator_node_from_tpg(acl, tpg);
 490         core_free_device_list_for_node(acl, tpg);
 491
 492         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 493                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 494                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 495                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 496
 497         return 0;
 498 }
 499 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 500
 501 /*      core_tpg_set_initiator_node_queue_depth():
 502  *
 503  *
 504  */
 505 int core_tpg_set_initiator_node_queue_depth(
 506         struct se_portal_group *tpg,
 507         unsigned char *initiatorname,
 508         u32 queue_depth,
 509         int force)
 510 {
 511         struct se_session *sess, *init_sess = NULL;
 512         struct se_node_acl *acl;
 513         int dynamic_acl = 0;
 514
 515         spin_lock_irq(&tpg->acl_node_lock);
 516         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 517         if (!acl) {
 518                 pr_err("Access Control List entry for %s Initiator"
 519                         " Node %s does not exists for TPG %hu, ignoring"
 520                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 521                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 522                 spin_unlock_irq(&tpg->acl_node_lock);
 523                 return -ENODEV;
 524         }
 525         if (acl->dynamic_node_acl) {
 526                 acl->dynamic_node_acl = 0;
 527                 dynamic_acl = 1;
 528         }
 529         spin_unlock_irq(&tpg->acl_node_lock);
 530
 531         spin_lock_bh(&tpg->session_lock);
 532         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 533                 if (sess->se_node_acl != acl)
 534                         continue;
 535
 536                 if (!force) {
 537                         pr_err("Unable to change queue depth for %s"
 538                                 " Initiator Node: %s while session is"
 539                                 " operational.  To forcefully change the queue"
 540                                 " depth and force session reinstatement"
 541                                 " use the \"force=1\" parameter.\n",
 542                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 543                         spin_unlock_bh(&tpg->session_lock);
 544
 545                         spin_lock_irq(&tpg->acl_node_lock);
 546                         if (dynamic_acl)
 547                                 acl->dynamic_node_acl = 1;
 548                         spin_unlock_irq(&tpg->acl_node_lock);
 549                         return -EEXIST;
 550                 }
 551                 /*
 552                  * Determine if the session needs to be closed by our context.
 553                  */
 554                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 555                         continue;
 556
 557                 init_sess = sess;
 558                 break;
 559         }
 560
 561         /*
 562          * User has requested to change the queue depth for a Initiator Node.
 563          * Change the value in the Node's struct se_node_acl, and call
 564          * core_set_queue_depth_for_node() to add the requested queue depth.
 565          *
 566          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 567          * reinstatement to occur if there is an active session for the
 568          * $FABRIC_MOD Initiator Node in question.
 569          */
 570         acl->queue_depth = queue_depth;
 571
 572         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 573                 spin_unlock_bh(&tpg->session_lock);
 574                 /*
 575                  * Force session reinstatement if
 576                  * core_set_queue_depth_for_node() failed, because we assume
 577                  * the $FABRIC_MOD has already the set session reinstatement
 578                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 579                  */
 580                 if (init_sess)
 581                         tpg->se_tpg_tfo->close_session(init_sess);
 582
 583                 spin_lock_irq(&tpg->acl_node_lock);
 584                 if (dynamic_acl)
 585                         acl->dynamic_node_acl = 1;
 586                 spin_unlock_irq(&tpg->acl_node_lock);
 587                 return -EINVAL;
 588         }
 589         spin_unlock_bh(&tpg->session_lock);
 590         /*
 591          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 592          * forcefully shutdown the $FABRIC_MOD session/nexus.
 593          */
 594         if (init_sess)
 595                 tpg->se_tpg_tfo->close_session(init_sess);
 596
 597         pr_debug("Successfully changed queue depth to: %d for Initiator"
 598                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 599                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 600                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 601
 602         spin_lock_irq(&tpg->acl_node_lock);
 603         if (dynamic_acl)
 604                 acl->dynamic_node_acl = 1;
 605         spin_unlock_irq(&tpg->acl_node_lock);
 606
 607         return 0;
 608 }
 609 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 610
 611 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 612 {
 613         /* Set in core_dev_setup_virtual_lun0() */
 614         struct se_device *dev = g_lun0_dev;
 615         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 616         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 617         int ret;
 618
 619         lun->unpacked_lun = 0;
 620         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 621         atomic_set(&lun->lun_acl_count, 0);
 622         init_completion(&lun->lun_shutdown_comp);
 623         INIT_LIST_HEAD(&lun->lun_acl_list);
 624         INIT_LIST_HEAD(&lun->lun_cmd_list);
 625         spin_lock_init(&lun->lun_acl_lock);
 626         spin_lock_init(&lun->lun_cmd_lock);
 627         spin_lock_init(&lun->lun_sep_lock);
 628
 629         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 630         if (ret < 0)
 631                 return ret;
 632
 633         return 0;
 634 }
 635
 636 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 637 {
 638         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 639
 640         core_tpg_post_dellun(se_tpg, lun);
 641 }
 642
 643 int core_tpg_register(
 644         struct target_core_fabric_ops *tfo,
 645         struct se_wwn *se_wwn,
 646         struct se_portal_group *se_tpg,
 647         void *tpg_fabric_ptr,
 648         int se_tpg_type)
 649 {
 650         struct se_lun *lun;
 651         u32 i;
 652
 653         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 654                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 655         if (!se_tpg->tpg_lun_list) {
 656                 pr_err("Unable to allocate struct se_portal_group->"
 657                                 "tpg_lun_list\n");
 658                 return -ENOMEM;
 659         }
 660
 661         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 662                 lun = &se_tpg->tpg_lun_list[i];
 663                 lun->unpacked_lun = i;
 664                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 665                 atomic_set(&lun->lun_acl_count, 0);
 666                 init_completion(&lun->lun_shutdown_comp);
 667                 INIT_LIST_HEAD(&lun->lun_acl_list);
 668                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 669                 spin_lock_init(&lun->lun_acl_lock);
 670                 spin_lock_init(&lun->lun_cmd_lock);
 671                 spin_lock_init(&lun->lun_sep_lock);
 672         }
 673
 674         se_tpg->se_tpg_type = se_tpg_type;
 675         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 676         se_tpg->se_tpg_tfo = tfo;
 677         se_tpg->se_tpg_wwn = se_wwn;
 678         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 679         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 680         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 681         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 682         spin_lock_init(&se_tpg->acl_node_lock);
 683         spin_lock_init(&se_tpg->session_lock);
 684         spin_lock_init(&se_tpg->tpg_lun_lock);
 685
 686         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 687                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 688                         kfree(se_tpg);
 689                         return -ENOMEM;
 690                 }
 691         }
 692
 693         spin_lock_bh(&tpg_lock);
 694         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 695         spin_unlock_bh(&tpg_lock);
 696
 697         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 698                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 699                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 700                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 701                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 702
 703         return 0;
 704 }
 705 EXPORT_SYMBOL(core_tpg_register);
 706
 707 int core_tpg_deregister(struct se_portal_group *se_tpg)
 708 {
 709         struct se_node_acl *nacl, *nacl_tmp;
 710
 711         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 712                 " for endpoint: %s Portal Tag %u\n",
 713                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 714                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 715                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 716                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 717
 718         spin_lock_bh(&tpg_lock);
 719         list_del(&se_tpg->se_tpg_node);
 720         spin_unlock_bh(&tpg_lock);
 721
 722         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 723                 cpu_relax();
 724         /*
 725          * Release any remaining demo-mode generated se_node_acl that have
 726          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 727          * in transport_deregister_session().
 728          */
 729         spin_lock_irq(&se_tpg->acl_node_lock);
 730         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 731                         acl_list) {
 732                 list_del(&nacl->acl_list);
 733                 se_tpg->num_node_acls--;
 734                 spin_unlock_irq(&se_tpg->acl_node_lock);
 735
 736                 core_tpg_wait_for_nacl_pr_ref(nacl);
 737                 core_free_device_list_for_node(nacl, se_tpg);
 738                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 739
 740                 spin_lock_irq(&se_tpg->acl_node_lock);
 741         }
 742         spin_unlock_irq(&se_tpg->acl_node_lock);
 743
 744         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 745                 core_tpg_release_virtual_lun0(se_tpg);
 746
 747         se_tpg->se_tpg_fabric_ptr = NULL;
 748         kfree(se_tpg->tpg_lun_list);
 749         return 0;
 750 }
 751 EXPORT_SYMBOL(core_tpg_deregister);
 752
 753 struct se_lun *core_tpg_pre_addlun(
 754         struct se_portal_group *tpg,
 755         u32 unpacked_lun)
 756 {
 757         struct se_lun *lun;
 758
 759         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 760                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 761                         "-1: %u for Target Portal Group: %u\n",
 762                         tpg->se_tpg_tfo->get_fabric_name(),
 763                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 764                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 765                 return ERR_PTR(-EOVERFLOW);
 766         }
 767
 768         spin_lock(&tpg->tpg_lun_lock);
 769         lun = &tpg->tpg_lun_list[unpacked_lun];
 770         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 771                 pr_err("TPG Logical Unit Number: %u is already active"
 772                         " on %s Target Portal Group: %u, ignoring request.\n",
 773                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 774                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 775                 spin_unlock(&tpg->tpg_lun_lock);
 776                 return ERR_PTR(-EINVAL);
 777         }
 778         spin_unlock(&tpg->tpg_lun_lock);
 779
 780         return lun;
 781 }
 782
 783 int core_tpg_post_addlun(
 784         struct se_portal_group *tpg,
 785         struct se_lun *lun,
 786         u32 lun_access,
 787         void *lun_ptr)
 788 {
 789         int ret;
 790
 791         ret = core_dev_export(lun_ptr, tpg, lun);
 792         if (ret < 0)
 793                 return ret;
 794
 795         spin_lock(&tpg->tpg_lun_lock);
 796         lun->lun_access = lun_access;
 797         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 798         spin_unlock(&tpg->tpg_lun_lock);
 799
 800         return 0;
 801 }
 802
 803 static void core_tpg_shutdown_lun(
 804         struct se_portal_group *tpg,
 805         struct se_lun *lun)
 806 {
 807         core_clear_lun_from_tpg(lun, tpg);
 808         transport_clear_lun_from_sessions(lun);
 809 }
 810
 811 struct se_lun *core_tpg_pre_dellun(
 812         struct se_portal_group *tpg,
 813         u32 unpacked_lun,
 814         int *ret)
 815 {
 816         struct se_lun *lun;
 817
 818         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 819                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 820                         "-1: %u for Target Portal Group: %u\n",
 821                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 822                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 823                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 824                 return ERR_PTR(-EOVERFLOW);
 825         }
 826
 827         spin_lock(&tpg->tpg_lun_lock);
 828         lun = &tpg->tpg_lun_list[unpacked_lun];
 829         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 830                 pr_err("%s Logical Unit Number: %u is not active on"
 831                         " Target Portal Group: %u, ignoring request.\n",
 832                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 833                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 834                 spin_unlock(&tpg->tpg_lun_lock);
 835                 return ERR_PTR(-ENODEV);
 836         }
 837         spin_unlock(&tpg->tpg_lun_lock);
 838
 839         return lun;
 840 }
 841
 842 int core_tpg_post_dellun(
 843         struct se_portal_group *tpg,
 844         struct se_lun *lun)
 845 {
 846         core_tpg_shutdown_lun(tpg, lun);
 847
 848         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 849
 850         spin_lock(&tpg->tpg_lun_lock);
 851         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 852         spin_unlock(&tpg->tpg_lun_lock);
 853
 854         return 0;
 855 }