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 <net/sock.h>
  36 #include <net/tcp.h>
  37 #include <scsi/scsi.h>
  38 #include <scsi/scsi_cmnd.h>
  39
  40 #include <target/target_core_base.h>
  41 #include <target/target_core_device.h>
  42 #include <target/target_core_tpg.h>
  43 #include <target/target_core_transport.h>
  44 #include <target/target_core_fabric_ops.h>
  45
  46 #include "target_core_hba.h"
  47
  48 /*      core_clear_initiator_node_from_tpg():
  49  *
  50  *
  51  */
  52 static void core_clear_initiator_node_from_tpg(
  53         struct se_node_acl *nacl,
  54         struct se_portal_group *tpg)
  55 {
  56         int i;
  57         struct se_dev_entry *deve;
  58         struct se_lun *lun;
  59         struct se_lun_acl *acl, *acl_tmp;
  60
  61         spin_lock_irq(&nacl->device_list_lock);
  62         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  63                 deve = &nacl->device_list[i];
  64
  65                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  66                         continue;
  67
  68                 if (!deve->se_lun) {
  69                         printk(KERN_ERR "%s device entries device pointer is"
  70                                 " NULL, but Initiator has access.\n",
  71                                 TPG_TFO(tpg)->get_fabric_name());
  72                         continue;
  73                 }
  74
  75                 lun = deve->se_lun;
  76                 spin_unlock_irq(&nacl->device_list_lock);
  77                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  78                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  79
  80                 spin_lock(&lun->lun_acl_lock);
  81                 list_for_each_entry_safe(acl, acl_tmp,
  82                                         &lun->lun_acl_list, lacl_list) {
  83                         if (!(strcmp(acl->initiatorname,
  84                                         nacl->initiatorname)) &&
  85                              (acl->mapped_lun == deve->mapped_lun))
  86                                 break;
  87                 }
  88
  89                 if (!acl) {
  90                         printk(KERN_ERR "Unable to locate struct se_lun_acl for %s,"
  91                                 " mapped_lun: %u\n", nacl->initiatorname,
  92                                 deve->mapped_lun);
  93                         spin_unlock(&lun->lun_acl_lock);
  94                         spin_lock_irq(&nacl->device_list_lock);
  95                         continue;
  96                 }
  97
  98                 list_del(&acl->lacl_list);
  99                 spin_unlock(&lun->lun_acl_lock);
 100
 101                 spin_lock_irq(&nacl->device_list_lock);
 102                 kfree(acl);
 103         }
 104         spin_unlock_irq(&nacl->device_list_lock);
 105 }
 106
 107 /*      __core_tpg_get_initiator_node_acl():
 108  *
 109  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 110  */
 111 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 112         struct se_portal_group *tpg,
 113         const char *initiatorname)
 114 {
 115         struct se_node_acl *acl;
 116
 117         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 118                 if (!(strcmp(acl->initiatorname, initiatorname)))
 119                         return acl;
 120         }
 121
 122         return NULL;
 123 }
 124
 125 /*      core_tpg_get_initiator_node_acl():
 126  *
 127  *
 128  */
 129 struct se_node_acl *core_tpg_get_initiator_node_acl(
 130         struct se_portal_group *tpg,
 131         unsigned char *initiatorname)
 132 {
 133         struct se_node_acl *acl;
 134
 135         spin_lock_bh(&tpg->acl_node_lock);
 136         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 137                 if (!(strcmp(acl->initiatorname, initiatorname)) &&
 138                    (!(acl->dynamic_node_acl))) {
 139                         spin_unlock_bh(&tpg->acl_node_lock);
 140                         return acl;
 141                 }
 142         }
 143         spin_unlock_bh(&tpg->acl_node_lock);
 144
 145         return NULL;
 146 }
 147
 148 /*      core_tpg_add_node_to_devs():
 149  *
 150  *
 151  */
 152 void core_tpg_add_node_to_devs(
 153         struct se_node_acl *acl,
 154         struct se_portal_group *tpg)
 155 {
 156         int i = 0;
 157         u32 lun_access = 0;
 158         struct se_lun *lun;
 159         struct se_device *dev;
 160
 161         spin_lock(&tpg->tpg_lun_lock);
 162         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 163                 lun = &tpg->tpg_lun_list[i];
 164                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 165                         continue;
 166
 167                 spin_unlock(&tpg->tpg_lun_lock);
 168
 169                 dev = lun->lun_se_dev;
 170                 /*
 171                  * By default in LIO-Target $FABRIC_MOD,
 172                  * demo_mode_write_protect is ON, or READ_ONLY;
 173                  */
 174                 if (!(TPG_TFO(tpg)->tpg_check_demo_mode_write_protect(tpg))) {
 175                         if (dev->dev_flags & DF_READ_ONLY)
 176                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 177                         else
 178                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 179                 } else {
 180                         /*
 181                          * Allow only optical drives to issue R/W in default RO
 182                          * demo mode.
 183                          */
 184                         if (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK)
 185                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 186                         else
 187                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 188                 }
 189
 190                 printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 191                         " access for LUN in Demo Mode\n",
 192                         TPG_TFO(tpg)->get_fabric_name(),
 193                         TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
 194                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 195                         "READ-WRITE" : "READ-ONLY");
 196
 197                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 198                                 lun_access, acl, tpg, 1);
 199                 spin_lock(&tpg->tpg_lun_lock);
 200         }
 201         spin_unlock(&tpg->tpg_lun_lock);
 202 }
 203
 204 /*      core_set_queue_depth_for_node():
 205  *
 206  *
 207  */
 208 static int core_set_queue_depth_for_node(
 209         struct se_portal_group *tpg,
 210         struct se_node_acl *acl)
 211 {
 212         if (!acl->queue_depth) {
 213                 printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0,"
 214                         "defaulting to 1.\n", TPG_TFO(tpg)->get_fabric_name(),
 215                         acl->initiatorname);
 216                 acl->queue_depth = 1;
 217         }
 218
 219         return 0;
 220 }
 221
 222 /*      core_create_device_list_for_node():
 223  *
 224  *
 225  */
 226 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 227 {
 228         struct se_dev_entry *deve;
 229         int i;
 230
 231         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
 232                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
 233         if (!(nacl->device_list)) {
 234                 printk(KERN_ERR "Unable to allocate memory for"
 235                         " struct se_node_acl->device_list\n");
 236                 return -1;
 237         }
 238         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 239                 deve = &nacl->device_list[i];
 240
 241                 atomic_set(&deve->ua_count, 0);
 242                 atomic_set(&deve->pr_ref_count, 0);
 243                 spin_lock_init(&deve->ua_lock);
 244                 INIT_LIST_HEAD(&deve->alua_port_list);
 245                 INIT_LIST_HEAD(&deve->ua_list);
 246         }
 247
 248         return 0;
 249 }
 250
 251 /*      core_tpg_check_initiator_node_acl()
 252  *
 253  *
 254  */
 255 struct se_node_acl *core_tpg_check_initiator_node_acl(
 256         struct se_portal_group *tpg,
 257         unsigned char *initiatorname)
 258 {
 259         struct se_node_acl *acl;
 260
 261         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 262         if ((acl))
 263                 return acl;
 264
 265         if (!(TPG_TFO(tpg)->tpg_check_demo_mode(tpg)))
 266                 return NULL;
 267
 268         acl =  TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg);
 269         if (!(acl))
 270                 return NULL;
 271
 272         INIT_LIST_HEAD(&acl->acl_list);
 273         INIT_LIST_HEAD(&acl->acl_sess_list);
 274         spin_lock_init(&acl->device_list_lock);
 275         spin_lock_init(&acl->nacl_sess_lock);
 276         atomic_set(&acl->acl_pr_ref_count, 0);
 277         acl->queue_depth = TPG_TFO(tpg)->tpg_get_default_depth(tpg);
 278         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 279         acl->se_tpg = tpg;
 280         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 281         spin_lock_init(&acl->stats_lock);
 282         acl->dynamic_node_acl = 1;
 283
 284         TPG_TFO(tpg)->set_default_node_attributes(acl);
 285
 286         if (core_create_device_list_for_node(acl) < 0) {
 287                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 288                 return NULL;
 289         }
 290
 291         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 292                 core_free_device_list_for_node(acl, tpg);
 293                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 294                 return NULL;
 295         }
 296
 297         core_tpg_add_node_to_devs(acl, tpg);
 298
 299         spin_lock_bh(&tpg->acl_node_lock);
 300         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 301         tpg->num_node_acls++;
 302         spin_unlock_bh(&tpg->acl_node_lock);
 303
 304         printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 305                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 306                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 307                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 308
 309         return acl;
 310 }
 311 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 312
 313 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 314 {
 315         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 316                 cpu_relax();
 317 }
 318
 319 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 320 {
 321         int i, ret;
 322         struct se_lun *lun;
 323
 324         spin_lock(&tpg->tpg_lun_lock);
 325         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 326                 lun = &tpg->tpg_lun_list[i];
 327
 328                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 329                     (lun->lun_se_dev == NULL))
 330                         continue;
 331
 332                 spin_unlock(&tpg->tpg_lun_lock);
 333                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 334                 spin_lock(&tpg->tpg_lun_lock);
 335         }
 336         spin_unlock(&tpg->tpg_lun_lock);
 337 }
 338 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 339
 340 /*      core_tpg_add_initiator_node_acl():
 341  *
 342  *
 343  */
 344 struct se_node_acl *core_tpg_add_initiator_node_acl(
 345         struct se_portal_group *tpg,
 346         struct se_node_acl *se_nacl,
 347         const char *initiatorname,
 348         u32 queue_depth)
 349 {
 350         struct se_node_acl *acl = NULL;
 351
 352         spin_lock_bh(&tpg->acl_node_lock);
 353         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 354         if ((acl)) {
 355                 if (acl->dynamic_node_acl) {
 356                         acl->dynamic_node_acl = 0;
 357                         printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL"
 358                                 " for %s\n", TPG_TFO(tpg)->get_fabric_name(),
 359                                 TPG_TFO(tpg)->tpg_get_tag(tpg), initiatorname);
 360                         spin_unlock_bh(&tpg->acl_node_lock);
 361                         /*
 362                          * Release the locally allocated struct se_node_acl
 363                          * because * core_tpg_add_initiator_node_acl() returned
 364                          * a pointer to an existing demo mode node ACL.
 365                          */
 366                         if (se_nacl)
 367                                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg,
 368                                                         se_nacl);
 369                         goto done;
 370                 }
 371
 372                 printk(KERN_ERR "ACL entry for %s Initiator"
 373                         " Node %s already exists for TPG %u, ignoring"
 374                         " request.\n",  TPG_TFO(tpg)->get_fabric_name(),
 375                         initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
 376                 spin_unlock_bh(&tpg->acl_node_lock);
 377                 return ERR_PTR(-EEXIST);
 378         }
 379         spin_unlock_bh(&tpg->acl_node_lock);
 380
 381         if (!(se_nacl)) {
 382                 printk("struct se_node_acl pointer is NULL\n");
 383                 return ERR_PTR(-EINVAL);
 384         }
 385         /*
 386          * For v4.x logic the se_node_acl_s is hanging off a fabric
 387          * dependent structure allocated via
 388          * struct target_core_fabric_ops->fabric_make_nodeacl()
 389          */
 390         acl = se_nacl;
 391
 392         INIT_LIST_HEAD(&acl->acl_list);
 393         INIT_LIST_HEAD(&acl->acl_sess_list);
 394         spin_lock_init(&acl->device_list_lock);
 395         spin_lock_init(&acl->nacl_sess_lock);
 396         atomic_set(&acl->acl_pr_ref_count, 0);
 397         acl->queue_depth = queue_depth;
 398         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 399         acl->se_tpg = tpg;
 400         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 401         spin_lock_init(&acl->stats_lock);
 402
 403         TPG_TFO(tpg)->set_default_node_attributes(acl);
 404
 405         if (core_create_device_list_for_node(acl) < 0) {
 406                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 407                 return ERR_PTR(-ENOMEM);
 408         }
 409
 410         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 411                 core_free_device_list_for_node(acl, tpg);
 412                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 413                 return ERR_PTR(-EINVAL);
 414         }
 415
 416         spin_lock_bh(&tpg->acl_node_lock);
 417         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 418         tpg->num_node_acls++;
 419         spin_unlock_bh(&tpg->acl_node_lock);
 420
 421 done:
 422         printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 423                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 424                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 425                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 426
 427         return acl;
 428 }
 429 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 430
 431 /*      core_tpg_del_initiator_node_acl():
 432  *
 433  *
 434  */
 435 int core_tpg_del_initiator_node_acl(
 436         struct se_portal_group *tpg,
 437         struct se_node_acl *acl,
 438         int force)
 439 {
 440         struct se_session *sess, *sess_tmp;
 441         int dynamic_acl = 0;
 442
 443         spin_lock_bh(&tpg->acl_node_lock);
 444         if (acl->dynamic_node_acl) {
 445                 acl->dynamic_node_acl = 0;
 446                 dynamic_acl = 1;
 447         }
 448         list_del(&acl->acl_list);
 449         tpg->num_node_acls--;
 450         spin_unlock_bh(&tpg->acl_node_lock);
 451
 452         spin_lock_bh(&tpg->session_lock);
 453         list_for_each_entry_safe(sess, sess_tmp,
 454                                 &tpg->tpg_sess_list, sess_list) {
 455                 if (sess->se_node_acl != acl)
 456                         continue;
 457                 /*
 458                  * Determine if the session needs to be closed by our context.
 459                  */
 460                 if (!(TPG_TFO(tpg)->shutdown_session(sess)))
 461                         continue;
 462
 463                 spin_unlock_bh(&tpg->session_lock);
 464                 /*
 465                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 466                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 467                  */
 468                 TPG_TFO(tpg)->close_session(sess);
 469
 470                 spin_lock_bh(&tpg->session_lock);
 471         }
 472         spin_unlock_bh(&tpg->session_lock);
 473
 474         core_tpg_wait_for_nacl_pr_ref(acl);
 475         core_clear_initiator_node_from_tpg(acl, tpg);
 476         core_free_device_list_for_node(acl, tpg);
 477
 478         printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 479                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 480                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 481                 TPG_TFO(tpg)->get_fabric_name(), acl->initiatorname);
 482
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 486
 487 /*      core_tpg_set_initiator_node_queue_depth():
 488  *
 489  *
 490  */
 491 int core_tpg_set_initiator_node_queue_depth(
 492         struct se_portal_group *tpg,
 493         unsigned char *initiatorname,
 494         u32 queue_depth,
 495         int force)
 496 {
 497         struct se_session *sess, *init_sess = NULL;
 498         struct se_node_acl *acl;
 499         int dynamic_acl = 0;
 500
 501         spin_lock_bh(&tpg->acl_node_lock);
 502         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 503         if (!(acl)) {
 504                 printk(KERN_ERR "Access Control List entry for %s Initiator"
 505                         " Node %s does not exists for TPG %hu, ignoring"
 506                         " request.\n", TPG_TFO(tpg)->get_fabric_name(),
 507                         initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
 508                 spin_unlock_bh(&tpg->acl_node_lock);
 509                 return -ENODEV;
 510         }
 511         if (acl->dynamic_node_acl) {
 512                 acl->dynamic_node_acl = 0;
 513                 dynamic_acl = 1;
 514         }
 515         spin_unlock_bh(&tpg->acl_node_lock);
 516
 517         spin_lock_bh(&tpg->session_lock);
 518         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 519                 if (sess->se_node_acl != acl)
 520                         continue;
 521
 522                 if (!force) {
 523                         printk(KERN_ERR "Unable to change queue depth for %s"
 524                                 " Initiator Node: %s while session is"
 525                                 " operational.  To forcefully change the queue"
 526                                 " depth and force session reinstatement"
 527                                 " use the \"force=1\" parameter.\n",
 528                                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 529                         spin_unlock_bh(&tpg->session_lock);
 530
 531                         spin_lock_bh(&tpg->acl_node_lock);
 532                         if (dynamic_acl)
 533                                 acl->dynamic_node_acl = 1;
 534                         spin_unlock_bh(&tpg->acl_node_lock);
 535                         return -EEXIST;
 536                 }
 537                 /*
 538                  * Determine if the session needs to be closed by our context.
 539                  */
 540                 if (!(TPG_TFO(tpg)->shutdown_session(sess)))
 541                         continue;
 542
 543                 init_sess = sess;
 544                 break;
 545         }
 546
 547         /*
 548          * User has requested to change the queue depth for a Initiator Node.
 549          * Change the value in the Node's struct se_node_acl, and call
 550          * core_set_queue_depth_for_node() to add the requested queue depth.
 551          *
 552          * Finally call  TPG_TFO(tpg)->close_session() to force session
 553          * reinstatement to occur if there is an active session for the
 554          * $FABRIC_MOD Initiator Node in question.
 555          */
 556         acl->queue_depth = queue_depth;
 557
 558         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 559                 spin_unlock_bh(&tpg->session_lock);
 560                 /*
 561                  * Force session reinstatement if
 562                  * core_set_queue_depth_for_node() failed, because we assume
 563                  * the $FABRIC_MOD has already the set session reinstatement
 564                  * bit from TPG_TFO(tpg)->shutdown_session() called above.
 565                  */
 566                 if (init_sess)
 567                         TPG_TFO(tpg)->close_session(init_sess);
 568
 569                 spin_lock_bh(&tpg->acl_node_lock);
 570                 if (dynamic_acl)
 571                         acl->dynamic_node_acl = 1;
 572                 spin_unlock_bh(&tpg->acl_node_lock);
 573                 return -EINVAL;
 574         }
 575         spin_unlock_bh(&tpg->session_lock);
 576         /*
 577          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 578          * forcefully shutdown the $FABRIC_MOD session/nexus.
 579          */
 580         if (init_sess)
 581                 TPG_TFO(tpg)->close_session(init_sess);
 582
 583         printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator"
 584                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 585                 initiatorname, TPG_TFO(tpg)->get_fabric_name(),
 586                 TPG_TFO(tpg)->tpg_get_tag(tpg));
 587
 588         spin_lock_bh(&tpg->acl_node_lock);
 589         if (dynamic_acl)
 590                 acl->dynamic_node_acl = 1;
 591         spin_unlock_bh(&tpg->acl_node_lock);
 592
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 596
 597 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 598 {
 599         /* Set in core_dev_setup_virtual_lun0() */
 600         struct se_device *dev = se_global->g_lun0_dev;
 601         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 602         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 603         int ret;
 604
 605         lun->unpacked_lun = 0;
 606         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 607         atomic_set(&lun->lun_acl_count, 0);
 608         init_completion(&lun->lun_shutdown_comp);
 609         INIT_LIST_HEAD(&lun->lun_acl_list);
 610         INIT_LIST_HEAD(&lun->lun_cmd_list);
 611         spin_lock_init(&lun->lun_acl_lock);
 612         spin_lock_init(&lun->lun_cmd_lock);
 613         spin_lock_init(&lun->lun_sep_lock);
 614
 615         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 616         if (ret < 0)
 617                 return -1;
 618
 619         return 0;
 620 }
 621
 622 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 623 {
 624         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 625
 626         core_tpg_post_dellun(se_tpg, lun);
 627 }
 628
 629 int core_tpg_register(
 630         struct target_core_fabric_ops *tfo,
 631         struct se_wwn *se_wwn,
 632         struct se_portal_group *se_tpg,
 633         void *tpg_fabric_ptr,
 634         int se_tpg_type)
 635 {
 636         struct se_lun *lun;
 637         u32 i;
 638
 639         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 640                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 641         if (!(se_tpg->tpg_lun_list)) {
 642                 printk(KERN_ERR "Unable to allocate struct se_portal_group->"
 643                                 "tpg_lun_list\n");
 644                 return -ENOMEM;
 645         }
 646
 647         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 648                 lun = &se_tpg->tpg_lun_list[i];
 649                 lun->unpacked_lun = i;
 650                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 651                 atomic_set(&lun->lun_acl_count, 0);
 652                 init_completion(&lun->lun_shutdown_comp);
 653                 INIT_LIST_HEAD(&lun->lun_acl_list);
 654                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 655                 spin_lock_init(&lun->lun_acl_lock);
 656                 spin_lock_init(&lun->lun_cmd_lock);
 657                 spin_lock_init(&lun->lun_sep_lock);
 658         }
 659
 660         se_tpg->se_tpg_type = se_tpg_type;
 661         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 662         se_tpg->se_tpg_tfo = tfo;
 663         se_tpg->se_tpg_wwn = se_wwn;
 664         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 665         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 666         INIT_LIST_HEAD(&se_tpg->se_tpg_list);
 667         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 668         spin_lock_init(&se_tpg->acl_node_lock);
 669         spin_lock_init(&se_tpg->session_lock);
 670         spin_lock_init(&se_tpg->tpg_lun_lock);
 671
 672         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 673                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 674                         kfree(se_tpg);
 675                         return -ENOMEM;
 676                 }
 677         }
 678
 679         spin_lock_bh(&se_global->se_tpg_lock);
 680         list_add_tail(&se_tpg->se_tpg_list, &se_global->g_se_tpg_list);
 681         spin_unlock_bh(&se_global->se_tpg_lock);
 682
 683         printk(KERN_INFO "TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 684                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 685                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 686                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 687                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 688
 689         return 0;
 690 }
 691 EXPORT_SYMBOL(core_tpg_register);
 692
 693 int core_tpg_deregister(struct se_portal_group *se_tpg)
 694 {
 695         struct se_node_acl *nacl, *nacl_tmp;
 696
 697         printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 698                 " for endpoint: %s Portal Tag %u\n",
 699                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 700                 "Normal" : "Discovery", TPG_TFO(se_tpg)->get_fabric_name(),
 701                 TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg),
 702                 TPG_TFO(se_tpg)->tpg_get_tag(se_tpg));
 703
 704         spin_lock_bh(&se_global->se_tpg_lock);
 705         list_del(&se_tpg->se_tpg_list);
 706         spin_unlock_bh(&se_global->se_tpg_lock);
 707
 708         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 709                 cpu_relax();
 710         /*
 711          * Release any remaining demo-mode generated se_node_acl that have
 712          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 713          * in transport_deregister_session().
 714          */
 715         spin_lock_bh(&se_tpg->acl_node_lock);
 716         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 717                         acl_list) {
 718                 list_del(&nacl->acl_list);
 719                 se_tpg->num_node_acls--;
 720                 spin_unlock_bh(&se_tpg->acl_node_lock);
 721
 722                 core_tpg_wait_for_nacl_pr_ref(nacl);
 723                 core_free_device_list_for_node(nacl, se_tpg);
 724                 TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg, nacl);
 725
 726                 spin_lock_bh(&se_tpg->acl_node_lock);
 727         }
 728         spin_unlock_bh(&se_tpg->acl_node_lock);
 729
 730         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 731                 core_tpg_release_virtual_lun0(se_tpg);
 732
 733         se_tpg->se_tpg_fabric_ptr = NULL;
 734         kfree(se_tpg->tpg_lun_list);
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(core_tpg_deregister);
 738
 739 struct se_lun *core_tpg_pre_addlun(
 740         struct se_portal_group *tpg,
 741         u32 unpacked_lun)
 742 {
 743         struct se_lun *lun;
 744
 745         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 746                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 747                         "-1: %u for Target Portal Group: %u\n",
 748                         TPG_TFO(tpg)->get_fabric_name(),
 749                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 750                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 751                 return ERR_PTR(-EOVERFLOW);
 752         }
 753
 754         spin_lock(&tpg->tpg_lun_lock);
 755         lun = &tpg->tpg_lun_list[unpacked_lun];
 756         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 757                 printk(KERN_ERR "TPG Logical Unit Number: %u is already active"
 758                         " on %s Target Portal Group: %u, ignoring request.\n",
 759                         unpacked_lun, TPG_TFO(tpg)->get_fabric_name(),
 760                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 761                 spin_unlock(&tpg->tpg_lun_lock);
 762                 return ERR_PTR(-EINVAL);
 763         }
 764         spin_unlock(&tpg->tpg_lun_lock);
 765
 766         return lun;
 767 }
 768
 769 int core_tpg_post_addlun(
 770         struct se_portal_group *tpg,
 771         struct se_lun *lun,
 772         u32 lun_access,
 773         void *lun_ptr)
 774 {
 775         if (core_dev_export(lun_ptr, tpg, lun) < 0)
 776                 return -1;
 777
 778         spin_lock(&tpg->tpg_lun_lock);
 779         lun->lun_access = lun_access;
 780         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 781         spin_unlock(&tpg->tpg_lun_lock);
 782
 783         return 0;
 784 }
 785
 786 static void core_tpg_shutdown_lun(
 787         struct se_portal_group *tpg,
 788         struct se_lun *lun)
 789 {
 790         core_clear_lun_from_tpg(lun, tpg);
 791         transport_clear_lun_from_sessions(lun);
 792 }
 793
 794 struct se_lun *core_tpg_pre_dellun(
 795         struct se_portal_group *tpg,
 796         u32 unpacked_lun,
 797         int *ret)
 798 {
 799         struct se_lun *lun;
 800
 801         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 802                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 803                         "-1: %u for Target Portal Group: %u\n",
 804                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
 805                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 806                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 807                 return ERR_PTR(-EOVERFLOW);
 808         }
 809
 810         spin_lock(&tpg->tpg_lun_lock);
 811         lun = &tpg->tpg_lun_list[unpacked_lun];
 812         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 813                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
 814                         " Target Portal Group: %u, ignoring request.\n",
 815                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
 816                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 817                 spin_unlock(&tpg->tpg_lun_lock);
 818                 return ERR_PTR(-ENODEV);
 819         }
 820         spin_unlock(&tpg->tpg_lun_lock);
 821
 822         return lun;
 823 }
 824
 825 int core_tpg_post_dellun(
 826         struct se_portal_group *tpg,
 827         struct se_lun *lun)
 828 {
 829         core_tpg_shutdown_lun(tpg, lun);
 830
 831         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 832
 833         spin_lock(&tpg->tpg_lun_lock);
 834         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 835         spin_unlock(&tpg->tpg_lun_lock);
 836
 837         return 0;
 838 }