Pileus Git - ~andy/linux/blob - 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         struct se_lun_acl *acl, *acl_tmp;
  64
  65         spin_lock_irq(&nacl->device_list_lock);
  66         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  67                 deve = &nacl->device_list[i];
  68
  69                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  70                         continue;
  71
  72                 if (!deve->se_lun) {
  73                         pr_err("%s device entries device pointer is"
  74                                 " NULL, but Initiator has access.\n",
  75                                 tpg->se_tpg_tfo->get_fabric_name());
  76                         continue;
  77                 }
  78
  79                 lun = deve->se_lun;
  80                 spin_unlock_irq(&nacl->device_list_lock);
  81                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  82                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  83
  84                 spin_lock(&lun->lun_acl_lock);
  85                 list_for_each_entry_safe(acl, acl_tmp,
  86                                         &lun->lun_acl_list, lacl_list) {
  87                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
  88                             (acl->mapped_lun == deve->mapped_lun))
  89                                 break;
  90                 }
  91
  92                 if (!acl) {
  93                         pr_err("Unable to locate struct se_lun_acl for %s,"
  94                                 " mapped_lun: %u\n", nacl->initiatorname,
  95                                 deve->mapped_lun);
  96                         spin_unlock(&lun->lun_acl_lock);
  97                         spin_lock_irq(&nacl->device_list_lock);
  98                         continue;
  99                 }
 100
 101                 list_del(&acl->lacl_list);
 102                 spin_unlock(&lun->lun_acl_lock);
 103
 104                 spin_lock_irq(&nacl->device_list_lock);
 105                 kfree(acl);
 106         }
 107         spin_unlock_irq(&nacl->device_list_lock);
 108 }
 109
 110 /*      __core_tpg_get_initiator_node_acl():
 111  *
 112  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 113  */
 114 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 115         struct se_portal_group *tpg,
 116         const char *initiatorname)
 117 {
 118         struct se_node_acl *acl;
 119
 120         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 121                 if (!strcmp(acl->initiatorname, initiatorname))
 122                         return acl;
 123         }
 124
 125         return NULL;
 126 }
 127
 128 /*      core_tpg_get_initiator_node_acl():
 129  *
 130  *
 131  */
 132 struct se_node_acl *core_tpg_get_initiator_node_acl(
 133         struct se_portal_group *tpg,
 134         unsigned char *initiatorname)
 135 {
 136         struct se_node_acl *acl;
 137
 138         spin_lock_irq(&tpg->acl_node_lock);
 139         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 140                 if (!strcmp(acl->initiatorname, initiatorname) &&
 141                     !acl->dynamic_node_acl) {
 142                         spin_unlock_irq(&tpg->acl_node_lock);
 143                         return acl;
 144                 }
 145         }
 146         spin_unlock_irq(&tpg->acl_node_lock);
 147
 148         return NULL;
 149 }
 150
 151 /*      core_tpg_add_node_to_devs():
 152  *
 153  *
 154  */
 155 void core_tpg_add_node_to_devs(
 156         struct se_node_acl *acl,
 157         struct se_portal_group *tpg)
 158 {
 159         int i = 0;
 160         u32 lun_access = 0;
 161         struct se_lun *lun;
 162         struct se_device *dev;
 163
 164         spin_lock(&tpg->tpg_lun_lock);
 165         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 166                 lun = &tpg->tpg_lun_list[i];
 167                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 168                         continue;
 169
 170                 spin_unlock(&tpg->tpg_lun_lock);
 171
 172                 dev = lun->lun_se_dev;
 173                 /*
 174                  * By default in LIO-Target $FABRIC_MOD,
 175                  * demo_mode_write_protect is ON, or READ_ONLY;
 176                  */
 177                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 178                         if (dev->dev_flags & DF_READ_ONLY)
 179                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 180                         else
 181                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 182                 } else {
 183                         /*
 184                          * Allow only optical drives to issue R/W in default RO
 185                          * demo mode.
 186                          */
 187                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 188                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 189                         else
 190                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 191                 }
 192
 193                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 194                         " access for LUN in Demo Mode\n",
 195                         tpg->se_tpg_tfo->get_fabric_name(),
 196                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 197                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 198                         "READ-WRITE" : "READ-ONLY");
 199
 200                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 201                                 lun_access, acl, tpg, 1);
 202                 spin_lock(&tpg->tpg_lun_lock);
 203         }
 204         spin_unlock(&tpg->tpg_lun_lock);
 205 }
 206
 207 /*      core_set_queue_depth_for_node():
 208  *
 209  *
 210  */
 211 static int core_set_queue_depth_for_node(
 212         struct se_portal_group *tpg,
 213         struct se_node_acl *acl)
 214 {
 215         if (!acl->queue_depth) {
 216                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 217                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 218                         acl->initiatorname);
 219                 acl->queue_depth = 1;
 220         }
 221
 222         return 0;
 223 }
 224
 225 /*      core_create_device_list_for_node():
 226  *
 227  *
 228  */
 229 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 230 {
 231         struct se_dev_entry *deve;
 232         int i;
 233
 234         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
 235                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
 236         if (!nacl->device_list) {
 237                 pr_err("Unable to allocate memory for"
 238                         " struct se_node_acl->device_list\n");
 239                 return -ENOMEM;
 240         }
 241         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 242                 deve = &nacl->device_list[i];
 243
 244                 atomic_set(&deve->ua_count, 0);
 245                 atomic_set(&deve->pr_ref_count, 0);
 246                 spin_lock_init(&deve->ua_lock);
 247                 INIT_LIST_HEAD(&deve->alua_port_list);
 248                 INIT_LIST_HEAD(&deve->ua_list);
 249         }
 250
 251         return 0;
 252 }
 253
 254 /*      core_tpg_check_initiator_node_acl()
 255  *
 256  *
 257  */
 258 struct se_node_acl *core_tpg_check_initiator_node_acl(
 259         struct se_portal_group *tpg,
 260         unsigned char *initiatorname)
 261 {
 262         struct se_node_acl *acl;
 263
 264         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 265         if (acl)
 266                 return acl;
 267
 268         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 269                 return NULL;
 270
 271         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 272         if (!acl)
 273                 return NULL;
 274
 275         INIT_LIST_HEAD(&acl->acl_list);
 276         INIT_LIST_HEAD(&acl->acl_sess_list);
 277         kref_init(&acl->acl_kref);
 278         init_completion(&acl->acl_free_comp);
 279         spin_lock_init(&acl->device_list_lock);
 280         spin_lock_init(&acl->nacl_sess_lock);
 281         atomic_set(&acl->acl_pr_ref_count, 0);
 282         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 283         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 284         acl->se_tpg = tpg;
 285         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 286         spin_lock_init(&acl->stats_lock);
 287         acl->dynamic_node_acl = 1;
 288
 289         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 290
 291         if (core_create_device_list_for_node(acl) < 0) {
 292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                 return NULL;
 294         }
 295
 296         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 297                 core_free_device_list_for_node(acl, tpg);
 298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 299                 return NULL;
 300         }
 301         /*
 302          * Here we only create demo-mode MappedLUNs from the active
 303          * TPG LUNs if the fabric is not explictly asking for
 304          * tpg_check_demo_mode_login_only() == 1.
 305          */
 306         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 307             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 308                 do { ; } while (0);
 309         else
 310                 core_tpg_add_node_to_devs(acl, tpg);
 311
 312         spin_lock_irq(&tpg->acl_node_lock);
 313         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 314         tpg->num_node_acls++;
 315         spin_unlock_irq(&tpg->acl_node_lock);
 316
 317         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 318                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 319                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 320                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 321
 322         return acl;
 323 }
 324 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 325
 326 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 327 {
 328         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 329                 cpu_relax();
 330 }
 331
 332 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 333 {
 334         int i, ret;
 335         struct se_lun *lun;
 336
 337         spin_lock(&tpg->tpg_lun_lock);
 338         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 339                 lun = &tpg->tpg_lun_list[i];
 340
 341                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 342                     (lun->lun_se_dev == NULL))
 343                         continue;
 344
 345                 spin_unlock(&tpg->tpg_lun_lock);
 346                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 347                 spin_lock(&tpg->tpg_lun_lock);
 348         }
 349         spin_unlock(&tpg->tpg_lun_lock);
 350 }
 351 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 352
 353 /*      core_tpg_add_initiator_node_acl():
 354  *
 355  *
 356  */
 357 struct se_node_acl *core_tpg_add_initiator_node_acl(
 358         struct se_portal_group *tpg,
 359         struct se_node_acl *se_nacl,
 360         const char *initiatorname,
 361         u32 queue_depth)
 362 {
 363         struct se_node_acl *acl = NULL;
 364
 365         spin_lock_irq(&tpg->acl_node_lock);
 366         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 367         if (acl) {
 368                 if (acl->dynamic_node_acl) {
 369                         acl->dynamic_node_acl = 0;
 370                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 371                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 372                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 373                         spin_unlock_irq(&tpg->acl_node_lock);
 374                         /*
 375                          * Release the locally allocated struct se_node_acl
 376                          * because * core_tpg_add_initiator_node_acl() returned
 377                          * a pointer to an existing demo mode node ACL.
 378                          */
 379                         if (se_nacl)
 380                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 381                                                         se_nacl);
 382                         goto done;
 383                 }
 384
 385                 pr_err("ACL entry for %s Initiator"
 386                         " Node %s already exists for TPG %u, ignoring"
 387                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 388                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 389                 spin_unlock_irq(&tpg->acl_node_lock);
 390                 return ERR_PTR(-EEXIST);
 391         }
 392         spin_unlock_irq(&tpg->acl_node_lock);
 393
 394         if (!se_nacl) {
 395                 pr_err("struct se_node_acl pointer is NULL\n");
 396                 return ERR_PTR(-EINVAL);
 397         }
 398         /*
 399          * For v4.x logic the se_node_acl_s is hanging off a fabric
 400          * dependent structure allocated via
 401          * struct target_core_fabric_ops->fabric_make_nodeacl()
 402          */
 403         acl = se_nacl;
 404
 405         INIT_LIST_HEAD(&acl->acl_list);
 406         INIT_LIST_HEAD(&acl->acl_sess_list);
 407         kref_init(&acl->acl_kref);
 408         init_completion(&acl->acl_free_comp);
 409         spin_lock_init(&acl->device_list_lock);
 410         spin_lock_init(&acl->nacl_sess_lock);
 411         atomic_set(&acl->acl_pr_ref_count, 0);
 412         acl->queue_depth = queue_depth;
 413         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 414         acl->se_tpg = tpg;
 415         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 416         spin_lock_init(&acl->stats_lock);
 417
 418         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 419
 420         if (core_create_device_list_for_node(acl) < 0) {
 421                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 422                 return ERR_PTR(-ENOMEM);
 423         }
 424
 425         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 426                 core_free_device_list_for_node(acl, tpg);
 427                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 428                 return ERR_PTR(-EINVAL);
 429         }
 430
 431         spin_lock_irq(&tpg->acl_node_lock);
 432         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 433         tpg->num_node_acls++;
 434         spin_unlock_irq(&tpg->acl_node_lock);
 435
 436 done:
 437         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 438                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 439                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 440                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 441
 442         return acl;
 443 }
 444 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 445
 446 /*      core_tpg_del_initiator_node_acl():
 447  *
 448  *
 449  */
 450 int core_tpg_del_initiator_node_acl(
 451         struct se_portal_group *tpg,
 452         struct se_node_acl *acl,
 453         int force)
 454 {
 455         LIST_HEAD(sess_list);
 456         struct se_session *sess, *sess_tmp;
 457         unsigned long flags;
 458         int dynamic_acl = 0, rc;
 459
 460         spin_lock_irq(&tpg->acl_node_lock);
 461         if (acl->dynamic_node_acl) {
 462                 acl->dynamic_node_acl = 0;
 463                 dynamic_acl = 1;
 464         }
 465         list_del(&acl->acl_list);
 466         tpg->num_node_acls--;
 467         spin_unlock_irq(&tpg->acl_node_lock);
 468
 469         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 470         acl->acl_stop = 1;
 471
 472         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 473                                 sess_acl_list) {
 474                 if (sess->sess_tearing_down != 0)
 475                         continue;
 476
 477                 target_get_session(sess);
 478                 list_move(&sess->sess_acl_list, &sess_list);
 479         }
 480         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 481
 482         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 483                 list_del(&sess->sess_acl_list);
 484
 485                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 486                 target_put_session(sess);
 487                 if (!rc)
 488                         continue;
 489                 target_put_session(sess);
 490         }
 491         target_put_nacl(acl);
 492         /*
 493          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 494          * for active fabric session transport_deregister_session() callbacks.
 495          */
 496         wait_for_completion(&acl->acl_free_comp);
 497
 498         core_tpg_wait_for_nacl_pr_ref(acl);
 499         core_clear_initiator_node_from_tpg(acl, tpg);
 500         core_free_device_list_for_node(acl, tpg);
 501
 502         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 503                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 504                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 505                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 506
 507         return 0;
 508 }
 509 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 510
 511 /*      core_tpg_set_initiator_node_queue_depth():
 512  *
 513  *
 514  */
 515 int core_tpg_set_initiator_node_queue_depth(
 516         struct se_portal_group *tpg,
 517         unsigned char *initiatorname,
 518         u32 queue_depth,
 519         int force)
 520 {
 521         struct se_session *sess, *init_sess = NULL;
 522         struct se_node_acl *acl;
 523         unsigned long flags;
 524         int dynamic_acl = 0;
 525
 526         spin_lock_irq(&tpg->acl_node_lock);
 527         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 528         if (!acl) {
 529                 pr_err("Access Control List entry for %s Initiator"
 530                         " Node %s does not exists for TPG %hu, ignoring"
 531                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 532                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 533                 spin_unlock_irq(&tpg->acl_node_lock);
 534                 return -ENODEV;
 535         }
 536         if (acl->dynamic_node_acl) {
 537                 acl->dynamic_node_acl = 0;
 538                 dynamic_acl = 1;
 539         }
 540         spin_unlock_irq(&tpg->acl_node_lock);
 541
 542         spin_lock_irqsave(&tpg->session_lock, flags);
 543         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 544                 if (sess->se_node_acl != acl)
 545                         continue;
 546
 547                 if (!force) {
 548                         pr_err("Unable to change queue depth for %s"
 549                                 " Initiator Node: %s while session is"
 550                                 " operational.  To forcefully change the queue"
 551                                 " depth and force session reinstatement"
 552                                 " use the \"force=1\" parameter.\n",
 553                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 554                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 555
 556                         spin_lock_irq(&tpg->acl_node_lock);
 557                         if (dynamic_acl)
 558                                 acl->dynamic_node_acl = 1;
 559                         spin_unlock_irq(&tpg->acl_node_lock);
 560                         return -EEXIST;
 561                 }
 562                 /*
 563                  * Determine if the session needs to be closed by our context.
 564                  */
 565                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 566                         continue;
 567
 568                 init_sess = sess;
 569                 break;
 570         }
 571
 572         /*
 573          * User has requested to change the queue depth for a Initiator Node.
 574          * Change the value in the Node's struct se_node_acl, and call
 575          * core_set_queue_depth_for_node() to add the requested queue depth.
 576          *
 577          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 578          * reinstatement to occur if there is an active session for the
 579          * $FABRIC_MOD Initiator Node in question.
 580          */
 581         acl->queue_depth = queue_depth;
 582
 583         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 584                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 585                 /*
 586                  * Force session reinstatement if
 587                  * core_set_queue_depth_for_node() failed, because we assume
 588                  * the $FABRIC_MOD has already the set session reinstatement
 589                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 590                  */
 591                 if (init_sess)
 592                         tpg->se_tpg_tfo->close_session(init_sess);
 593
 594                 spin_lock_irq(&tpg->acl_node_lock);
 595                 if (dynamic_acl)
 596                         acl->dynamic_node_acl = 1;
 597                 spin_unlock_irq(&tpg->acl_node_lock);
 598                 return -EINVAL;
 599         }
 600         spin_unlock_irqrestore(&tpg->session_lock, flags);
 601         /*
 602          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 603          * forcefully shutdown the $FABRIC_MOD session/nexus.
 604          */
 605         if (init_sess)
 606                 tpg->se_tpg_tfo->close_session(init_sess);
 607
 608         pr_debug("Successfully changed queue depth to: %d for Initiator"
 609                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 610                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 611                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 612
 613         spin_lock_irq(&tpg->acl_node_lock);
 614         if (dynamic_acl)
 615                 acl->dynamic_node_acl = 1;
 616         spin_unlock_irq(&tpg->acl_node_lock);
 617
 618         return 0;
 619 }
 620 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 621
 622 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 623 {
 624         /* Set in core_dev_setup_virtual_lun0() */
 625         struct se_device *dev = g_lun0_dev;
 626         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 627         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 628         int ret;
 629
 630         lun->unpacked_lun = 0;
 631         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 632         atomic_set(&lun->lun_acl_count, 0);
 633         init_completion(&lun->lun_shutdown_comp);
 634         INIT_LIST_HEAD(&lun->lun_acl_list);
 635         INIT_LIST_HEAD(&lun->lun_cmd_list);
 636         spin_lock_init(&lun->lun_acl_lock);
 637         spin_lock_init(&lun->lun_cmd_lock);
 638         spin_lock_init(&lun->lun_sep_lock);
 639
 640         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 641         if (ret < 0)
 642                 return ret;
 643
 644         return 0;
 645 }
 646
 647 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 648 {
 649         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 650
 651         core_tpg_post_dellun(se_tpg, lun);
 652 }
 653
 654 int core_tpg_register(
 655         struct target_core_fabric_ops *tfo,
 656         struct se_wwn *se_wwn,
 657         struct se_portal_group *se_tpg,
 658         void *tpg_fabric_ptr,
 659         int se_tpg_type)
 660 {
 661         struct se_lun *lun;
 662         u32 i;
 663
 664         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 665                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 666         if (!se_tpg->tpg_lun_list) {
 667                 pr_err("Unable to allocate struct se_portal_group->"
 668                                 "tpg_lun_list\n");
 669                 return -ENOMEM;
 670         }
 671
 672         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 673                 lun = &se_tpg->tpg_lun_list[i];
 674                 lun->unpacked_lun = i;
 675                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 676                 atomic_set(&lun->lun_acl_count, 0);
 677                 init_completion(&lun->lun_shutdown_comp);
 678                 INIT_LIST_HEAD(&lun->lun_acl_list);
 679                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 680                 spin_lock_init(&lun->lun_acl_lock);
 681                 spin_lock_init(&lun->lun_cmd_lock);
 682                 spin_lock_init(&lun->lun_sep_lock);
 683         }
 684
 685         se_tpg->se_tpg_type = se_tpg_type;
 686         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 687         se_tpg->se_tpg_tfo = tfo;
 688         se_tpg->se_tpg_wwn = se_wwn;
 689         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 690         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 691         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 692         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 693         spin_lock_init(&se_tpg->acl_node_lock);
 694         spin_lock_init(&se_tpg->session_lock);
 695         spin_lock_init(&se_tpg->tpg_lun_lock);
 696
 697         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 698                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 699                         kfree(se_tpg);
 700                         return -ENOMEM;
 701                 }
 702         }
 703
 704         spin_lock_bh(&tpg_lock);
 705         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 706         spin_unlock_bh(&tpg_lock);
 707
 708         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 709                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 710                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 711                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 712                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 713
 714         return 0;
 715 }
 716 EXPORT_SYMBOL(core_tpg_register);
 717
 718 int core_tpg_deregister(struct se_portal_group *se_tpg)
 719 {
 720         struct se_node_acl *nacl, *nacl_tmp;
 721
 722         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 723                 " for endpoint: %s Portal Tag %u\n",
 724                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 725                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 726                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 727                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 728
 729         spin_lock_bh(&tpg_lock);
 730         list_del(&se_tpg->se_tpg_node);
 731         spin_unlock_bh(&tpg_lock);
 732
 733         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 734                 cpu_relax();
 735         /*
 736          * Release any remaining demo-mode generated se_node_acl that have
 737          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 738          * in transport_deregister_session().
 739          */
 740         spin_lock_irq(&se_tpg->acl_node_lock);
 741         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 742                         acl_list) {
 743                 list_del(&nacl->acl_list);
 744                 se_tpg->num_node_acls--;
 745                 spin_unlock_irq(&se_tpg->acl_node_lock);
 746
 747                 core_tpg_wait_for_nacl_pr_ref(nacl);
 748                 core_free_device_list_for_node(nacl, se_tpg);
 749                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 750
 751                 spin_lock_irq(&se_tpg->acl_node_lock);
 752         }
 753         spin_unlock_irq(&se_tpg->acl_node_lock);
 754
 755         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 756                 core_tpg_release_virtual_lun0(se_tpg);
 757
 758         se_tpg->se_tpg_fabric_ptr = NULL;
 759         kfree(se_tpg->tpg_lun_list);
 760         return 0;
 761 }
 762 EXPORT_SYMBOL(core_tpg_deregister);
 763
 764 struct se_lun *core_tpg_pre_addlun(
 765         struct se_portal_group *tpg,
 766         u32 unpacked_lun)
 767 {
 768         struct se_lun *lun;
 769
 770         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 771                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 772                         "-1: %u for Target Portal Group: %u\n",
 773                         tpg->se_tpg_tfo->get_fabric_name(),
 774                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 775                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 776                 return ERR_PTR(-EOVERFLOW);
 777         }
 778
 779         spin_lock(&tpg->tpg_lun_lock);
 780         lun = &tpg->tpg_lun_list[unpacked_lun];
 781         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 782                 pr_err("TPG Logical Unit Number: %u is already active"
 783                         " on %s Target Portal Group: %u, ignoring request.\n",
 784                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 785                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 786                 spin_unlock(&tpg->tpg_lun_lock);
 787                 return ERR_PTR(-EINVAL);
 788         }
 789         spin_unlock(&tpg->tpg_lun_lock);
 790
 791         return lun;
 792 }
 793
 794 int core_tpg_post_addlun(
 795         struct se_portal_group *tpg,
 796         struct se_lun *lun,
 797         u32 lun_access,
 798         void *lun_ptr)
 799 {
 800         int ret;
 801
 802         ret = core_dev_export(lun_ptr, tpg, lun);
 803         if (ret < 0)
 804                 return ret;
 805
 806         spin_lock(&tpg->tpg_lun_lock);
 807         lun->lun_access = lun_access;
 808         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 809         spin_unlock(&tpg->tpg_lun_lock);
 810
 811         return 0;
 812 }
 813
 814 static void core_tpg_shutdown_lun(
 815         struct se_portal_group *tpg,
 816         struct se_lun *lun)
 817 {
 818         core_clear_lun_from_tpg(lun, tpg);
 819         transport_clear_lun_from_sessions(lun);
 820 }
 821
 822 struct se_lun *core_tpg_pre_dellun(
 823         struct se_portal_group *tpg,
 824         u32 unpacked_lun)
 825 {
 826         struct se_lun *lun;
 827
 828         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 829                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 830                         "-1: %u for Target Portal Group: %u\n",
 831                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 832                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 833                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 834                 return ERR_PTR(-EOVERFLOW);
 835         }
 836
 837         spin_lock(&tpg->tpg_lun_lock);
 838         lun = &tpg->tpg_lun_list[unpacked_lun];
 839         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 840                 pr_err("%s Logical Unit Number: %u is not active on"
 841                         " Target Portal Group: %u, ignoring request.\n",
 842                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 843                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 844                 spin_unlock(&tpg->tpg_lun_lock);
 845                 return ERR_PTR(-ENODEV);
 846         }
 847         spin_unlock(&tpg->tpg_lun_lock);
 848
 849         return lun;
 850 }
 851
 852 int core_tpg_post_dellun(
 853         struct se_portal_group *tpg,
 854         struct se_lun *lun)
 855 {
 856         core_tpg_shutdown_lun(tpg, lun);
 857
 858         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 859
 860         spin_lock(&tpg->tpg_lun_lock);
 861         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 862         spin_unlock(&tpg->tpg_lun_lock);
 863
 864         return 0;
 865 }