drivers/target/target_core_tpg.c

   1 /*******************************************************************************
   2  * Filename:  target_core_tpg.c
   3  *
   4  * This file contains generic Target Portal Group related functions.
   5  *
   6  * (c) Copyright 2002-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/net.h>
  27 #include <linux/string.h>
  28 #include <linux/timer.h>
  29 #include <linux/slab.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/in.h>
  32 #include <linux/export.h>
  33 #include <net/sock.h>
  34 #include <net/tcp.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_cmnd.h>
  37
  38 #include <target/target_core_base.h>
  39 #include <target/target_core_backend.h>
  40 #include <target/target_core_fabric.h>
  41
  42 #include "target_core_internal.h"
  43 #include "target_core_pr.h"
  44
  45 extern struct se_device *g_lun0_dev;
  46
  47 static DEFINE_SPINLOCK(tpg_lock);
  48 static LIST_HEAD(tpg_list);
  49
  50 /*      __core_tpg_get_initiator_node_acl():
  51  *
  52  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  53  */
  54 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  55         struct se_portal_group *tpg,
  56         const char *initiatorname)
  57 {
  58         struct se_node_acl *acl;
  59
  60         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  61                 if (!strcmp(acl->initiatorname, initiatorname))
  62                         return acl;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 /*      core_tpg_get_initiator_node_acl():
  69  *
  70  *
  71  */
  72 struct se_node_acl *core_tpg_get_initiator_node_acl(
  73         struct se_portal_group *tpg,
  74         unsigned char *initiatorname)
  75 {
  76         struct se_node_acl *acl;
  77
  78         spin_lock_irq(&tpg->acl_node_lock);
  79         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
  80         spin_unlock_irq(&tpg->acl_node_lock);
  81
  82         return acl;
  83 }
  84 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
  85
  86 /*      core_tpg_add_node_to_devs():
  87  *
  88  *
  89  */
  90 void core_tpg_add_node_to_devs(
  91         struct se_node_acl *acl,
  92         struct se_portal_group *tpg)
  93 {
  94         u32 lun_access = 0;
  95         struct se_lun *lun;
  96         struct se_device *dev;
  97
  98         mutex_lock(&tpg->tpg_lun_mutex);
  99         hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
 100                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 101                         continue;
 102
 103                 dev = lun->lun_se_dev;
 104                 /*
 105                  * By default in LIO-Target $FABRIC_MOD,
 106                  * demo_mode_write_protect is ON, or READ_ONLY;
 107                  */
 108                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 109                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 110                 } else {
 111                         /*
 112                          * Allow only optical drives to issue R/W in default RO
 113                          * demo mode.
 114                          */
 115                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 116                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 117                         else
 118                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 119                 }
 120
 121                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 122                         " access for LUN in Demo Mode\n",
 123                         tpg->se_tpg_tfo->get_fabric_name(),
 124                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 125                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 126                         "READ-WRITE" : "READ-ONLY");
 127
 128                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 129                                                  lun_access, acl, tpg);
 130                 /*
 131                  * Check to see if there are any existing persistent reservation
 132                  * APTPL pre-registrations that need to be enabled for this dynamic
 133                  * LUN ACL now..
 134                  */
 135                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 136                                                     lun->unpacked_lun);
 137         }
 138         mutex_unlock(&tpg->tpg_lun_mutex);
 139 }
 140
 141 /*      core_set_queue_depth_for_node():
 142  *
 143  *
 144  */
 145 static int core_set_queue_depth_for_node(
 146         struct se_portal_group *tpg,
 147         struct se_node_acl *acl)
 148 {
 149         if (!acl->queue_depth) {
 150                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 151                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 152                         acl->initiatorname);
 153                 acl->queue_depth = 1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
 160                 const unsigned char *initiatorname)
 161 {
 162         struct se_node_acl *acl;
 163
 164         acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
 165                         GFP_KERNEL);
 166         if (!acl)
 167                 return NULL;
 168
 169         INIT_LIST_HEAD(&acl->acl_list);
 170         INIT_LIST_HEAD(&acl->acl_sess_list);
 171         INIT_HLIST_HEAD(&acl->lun_entry_hlist);
 172         kref_init(&acl->acl_kref);
 173         init_completion(&acl->acl_free_comp);
 174         spin_lock_init(&acl->nacl_sess_lock);
 175         mutex_init(&acl->lun_entry_mutex);
 176         atomic_set(&acl->acl_pr_ref_count, 0);
 177         if (tpg->se_tpg_tfo->tpg_get_default_depth)
 178                 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 179         else
 180                 acl->queue_depth = 1;
 181         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 182         acl->se_tpg = tpg;
 183         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 184
 185         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 186
 187         if (core_set_queue_depth_for_node(tpg, acl) < 0)
 188                 goto out_free_acl;
 189
 190         return acl;
 191
 192 out_free_acl:
 193         kfree(acl);
 194         return NULL;
 195 }
 196
 197 static void target_add_node_acl(struct se_node_acl *acl)
 198 {
 199         struct se_portal_group *tpg = acl->se_tpg;
 200
 201         spin_lock_irq(&tpg->acl_node_lock);
 202         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 203         tpg->num_node_acls++;
 204         spin_unlock_irq(&tpg->acl_node_lock);
 205
 206         pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
 207                 " Initiator Node: %s\n",
 208                 tpg->se_tpg_tfo->get_fabric_name(),
 209                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 210                 acl->dynamic_node_acl ? "DYNAMIC" : "",
 211                 acl->queue_depth,
 212                 tpg->se_tpg_tfo->get_fabric_name(),
 213                 acl->initiatorname);
 214 }
 215
 216 struct se_node_acl *core_tpg_check_initiator_node_acl(
 217         struct se_portal_group *tpg,
 218         unsigned char *initiatorname)
 219 {
 220         struct se_node_acl *acl;
 221
 222         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 223         if (acl)
 224                 return acl;
 225
 226         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 227                 return NULL;
 228
 229         acl = target_alloc_node_acl(tpg, initiatorname);
 230         if (!acl)
 231                 return NULL;
 232         acl->dynamic_node_acl = 1;
 233
 234         /*
 235          * Here we only create demo-mode MappedLUNs from the active
 236          * TPG LUNs if the fabric is not explicitly asking for
 237          * tpg_check_demo_mode_login_only() == 1.
 238          */
 239         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 240             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 241                 core_tpg_add_node_to_devs(acl, tpg);
 242
 243         target_add_node_acl(acl);
 244         return acl;
 245 }
 246 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 247
 248 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 249 {
 250         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 251                 cpu_relax();
 252 }
 253
 254 struct se_node_acl *core_tpg_add_initiator_node_acl(
 255         struct se_portal_group *tpg,
 256         const char *initiatorname)
 257 {
 258         struct se_node_acl *acl;
 259
 260         spin_lock_irq(&tpg->acl_node_lock);
 261         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 262         if (acl) {
 263                 if (acl->dynamic_node_acl) {
 264                         acl->dynamic_node_acl = 0;
 265                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 266                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 267                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 268                         spin_unlock_irq(&tpg->acl_node_lock);
 269                         return acl;
 270                 }
 271
 272                 pr_err("ACL entry for %s Initiator"
 273                         " Node %s already exists for TPG %u, ignoring"
 274                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 275                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 276                 spin_unlock_irq(&tpg->acl_node_lock);
 277                 return ERR_PTR(-EEXIST);
 278         }
 279         spin_unlock_irq(&tpg->acl_node_lock);
 280
 281         acl = target_alloc_node_acl(tpg, initiatorname);
 282         if (!acl)
 283                 return ERR_PTR(-ENOMEM);
 284
 285         target_add_node_acl(acl);
 286         return acl;
 287 }
 288
 289 void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
 290 {
 291         struct se_portal_group *tpg = acl->se_tpg;
 292         LIST_HEAD(sess_list);
 293         struct se_session *sess, *sess_tmp;
 294         unsigned long flags;
 295         int rc;
 296
 297         spin_lock_irq(&tpg->acl_node_lock);
 298         if (acl->dynamic_node_acl) {
 299                 acl->dynamic_node_acl = 0;
 300         }
 301         list_del(&acl->acl_list);
 302         tpg->num_node_acls--;
 303         spin_unlock_irq(&tpg->acl_node_lock);
 304
 305         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 306         acl->acl_stop = 1;
 307
 308         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 309                                 sess_acl_list) {
 310                 if (sess->sess_tearing_down != 0)
 311                         continue;
 312
 313                 target_get_session(sess);
 314                 list_move(&sess->sess_acl_list, &sess_list);
 315         }
 316         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 317
 318         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 319                 list_del(&sess->sess_acl_list);
 320
 321                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 322                 target_put_session(sess);
 323                 if (!rc)
 324                         continue;
 325                 target_put_session(sess);
 326         }
 327         target_put_nacl(acl);
 328         /*
 329          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 330          * for active fabric session transport_deregister_session() callbacks.
 331          */
 332         wait_for_completion(&acl->acl_free_comp);
 333
 334         core_tpg_wait_for_nacl_pr_ref(acl);
 335         core_free_device_list_for_node(acl, tpg);
 336
 337         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 338                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 339                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 340                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 341
 342         kfree(acl);
 343 }
 344
 345 /*      core_tpg_set_initiator_node_queue_depth():
 346  *
 347  *
 348  */
 349 int core_tpg_set_initiator_node_queue_depth(
 350         struct se_portal_group *tpg,
 351         unsigned char *initiatorname,
 352         u32 queue_depth,
 353         int force)
 354 {
 355         struct se_session *sess, *init_sess = NULL;
 356         struct se_node_acl *acl;
 357         unsigned long flags;
 358         int dynamic_acl = 0;
 359
 360         spin_lock_irq(&tpg->acl_node_lock);
 361         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 362         if (!acl) {
 363                 pr_err("Access Control List entry for %s Initiator"
 364                         " Node %s does not exists for TPG %hu, ignoring"
 365                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 366                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 367                 spin_unlock_irq(&tpg->acl_node_lock);
 368                 return -ENODEV;
 369         }
 370         if (acl->dynamic_node_acl) {
 371                 acl->dynamic_node_acl = 0;
 372                 dynamic_acl = 1;
 373         }
 374         spin_unlock_irq(&tpg->acl_node_lock);
 375
 376         spin_lock_irqsave(&tpg->session_lock, flags);
 377         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 378                 if (sess->se_node_acl != acl)
 379                         continue;
 380
 381                 if (!force) {
 382                         pr_err("Unable to change queue depth for %s"
 383                                 " Initiator Node: %s while session is"
 384                                 " operational.  To forcefully change the queue"
 385                                 " depth and force session reinstatement"
 386                                 " use the \"force=1\" parameter.\n",
 387                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 388                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 389
 390                         spin_lock_irq(&tpg->acl_node_lock);
 391                         if (dynamic_acl)
 392                                 acl->dynamic_node_acl = 1;
 393                         spin_unlock_irq(&tpg->acl_node_lock);
 394                         return -EEXIST;
 395                 }
 396                 /*
 397                  * Determine if the session needs to be closed by our context.
 398                  */
 399                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 400                         continue;
 401
 402                 init_sess = sess;
 403                 break;
 404         }
 405
 406         /*
 407          * User has requested to change the queue depth for a Initiator Node.
 408          * Change the value in the Node's struct se_node_acl, and call
 409          * core_set_queue_depth_for_node() to add the requested queue depth.
 410          *
 411          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 412          * reinstatement to occur if there is an active session for the
 413          * $FABRIC_MOD Initiator Node in question.
 414          */
 415         acl->queue_depth = queue_depth;
 416
 417         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 418                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 419                 /*
 420                  * Force session reinstatement if
 421                  * core_set_queue_depth_for_node() failed, because we assume
 422                  * the $FABRIC_MOD has already the set session reinstatement
 423                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 424                  */
 425                 if (init_sess)
 426                         tpg->se_tpg_tfo->close_session(init_sess);
 427
 428                 spin_lock_irq(&tpg->acl_node_lock);
 429                 if (dynamic_acl)
 430                         acl->dynamic_node_acl = 1;
 431                 spin_unlock_irq(&tpg->acl_node_lock);
 432                 return -EINVAL;
 433         }
 434         spin_unlock_irqrestore(&tpg->session_lock, flags);
 435         /*
 436          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 437          * forcefully shutdown the $FABRIC_MOD session/nexus.
 438          */
 439         if (init_sess)
 440                 tpg->se_tpg_tfo->close_session(init_sess);
 441
 442         pr_debug("Successfully changed queue depth to: %d for Initiator"
 443                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 444                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 445                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 446
 447         spin_lock_irq(&tpg->acl_node_lock);
 448         if (dynamic_acl)
 449                 acl->dynamic_node_acl = 1;
 450         spin_unlock_irq(&tpg->acl_node_lock);
 451
 452         return 0;
 453 }
 454 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 455
 456 /*      core_tpg_set_initiator_node_tag():
 457  *
 458  *      Initiator nodeacl tags are not used internally, but may be used by
 459  *      userspace to emulate aliases or groups.
 460  *      Returns length of newly-set tag or -EINVAL.
 461  */
 462 int core_tpg_set_initiator_node_tag(
 463         struct se_portal_group *tpg,
 464         struct se_node_acl *acl,
 465         const char *new_tag)
 466 {
 467         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 468                 return -EINVAL;
 469
 470         if (!strncmp("NULL", new_tag, 4)) {
 471                 acl->acl_tag[0] = '\0';
 472                 return 0;
 473         }
 474
 475         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 476 }
 477 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 478
 479 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 480 {
 481         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 482
 483         complete(&lun->lun_ref_comp);
 484 }
 485
 486 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 487 {
 488         /* Set in core_dev_setup_virtual_lun0() */
 489         struct se_device *dev = g_lun0_dev;
 490         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 491         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 492         int ret;
 493
 494         lun->unpacked_lun = 0;
 495         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 496         atomic_set(&lun->lun_acl_count, 0);
 497         init_completion(&lun->lun_shutdown_comp);
 498         INIT_LIST_HEAD(&lun->lun_acl_list);
 499         spin_lock_init(&lun->lun_acl_lock);
 500         spin_lock_init(&lun->lun_sep_lock);
 501         init_completion(&lun->lun_ref_comp);
 502
 503         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 504         if (ret < 0)
 505                 return ret;
 506
 507         return 0;
 508 }
 509
 510 int core_tpg_register(
 511         const struct target_core_fabric_ops *tfo,
 512         struct se_wwn *se_wwn,
 513         struct se_portal_group *se_tpg,
 514         int proto_id)
 515 {
 516         INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist);
 517         se_tpg->proto_id = proto_id;
 518         se_tpg->se_tpg_tfo = tfo;
 519         se_tpg->se_tpg_wwn = se_wwn;
 520         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 521         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 522         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 523         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 524         spin_lock_init(&se_tpg->acl_node_lock);
 525         spin_lock_init(&se_tpg->session_lock);
 526         mutex_init(&se_tpg->tpg_lun_mutex);
 527
 528         if (se_tpg->proto_id >= 0) {
 529                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0)
 530                         return -ENOMEM;
 531         }
 532
 533         spin_lock_bh(&tpg_lock);
 534         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 535         spin_unlock_bh(&tpg_lock);
 536
 537         pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
 538                  "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(),
 539                 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
 540                 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
 541
 542         return 0;
 543 }
 544 EXPORT_SYMBOL(core_tpg_register);
 545
 546 int core_tpg_deregister(struct se_portal_group *se_tpg)
 547 {
 548         const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
 549         struct se_node_acl *nacl, *nacl_tmp;
 550
 551         pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
 552                  "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(),
 553                 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
 554                 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
 555
 556         spin_lock_bh(&tpg_lock);
 557         list_del(&se_tpg->se_tpg_node);
 558         spin_unlock_bh(&tpg_lock);
 559
 560         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 561                 cpu_relax();
 562         /*
 563          * Release any remaining demo-mode generated se_node_acl that have
 564          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 565          * in transport_deregister_session().
 566          */
 567         spin_lock_irq(&se_tpg->acl_node_lock);
 568         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 569                         acl_list) {
 570                 list_del(&nacl->acl_list);
 571                 se_tpg->num_node_acls--;
 572                 spin_unlock_irq(&se_tpg->acl_node_lock);
 573
 574                 core_tpg_wait_for_nacl_pr_ref(nacl);
 575                 core_free_device_list_for_node(nacl, se_tpg);
 576                 kfree(nacl);
 577
 578                 spin_lock_irq(&se_tpg->acl_node_lock);
 579         }
 580         spin_unlock_irq(&se_tpg->acl_node_lock);
 581
 582         if (se_tpg->proto_id >= 0)
 583                 core_tpg_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
 584
 585         return 0;
 586 }
 587 EXPORT_SYMBOL(core_tpg_deregister);
 588
 589 struct se_lun *core_tpg_alloc_lun(
 590         struct se_portal_group *tpg,
 591         u32 unpacked_lun)
 592 {
 593         struct se_lun *lun;
 594
 595         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 596                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 597                         "-1: %u for Target Portal Group: %u\n",
 598                         tpg->se_tpg_tfo->get_fabric_name(),
 599                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 600                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 601                 return ERR_PTR(-EOVERFLOW);
 602         }
 603
 604         lun = kzalloc(sizeof(*lun), GFP_KERNEL);
 605         if (!lun) {
 606                 pr_err("Unable to allocate se_lun memory\n");
 607                 return ERR_PTR(-ENOMEM);
 608         }
 609         lun->unpacked_lun = unpacked_lun;
 610         lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 611         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 612         atomic_set(&lun->lun_acl_count, 0);
 613         init_completion(&lun->lun_shutdown_comp);
 614         INIT_LIST_HEAD(&lun->lun_acl_list);
 615         spin_lock_init(&lun->lun_acl_lock);
 616         spin_lock_init(&lun->lun_sep_lock);
 617         init_completion(&lun->lun_ref_comp);
 618
 619         return lun;
 620 }
 621
 622 int core_tpg_add_lun(
 623         struct se_portal_group *tpg,
 624         struct se_lun *lun,
 625         u32 lun_access,
 626         struct se_device *dev)
 627 {
 628         int ret;
 629
 630         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 631                               GFP_KERNEL);
 632         if (ret < 0)
 633                 return ret;
 634
 635         ret = core_dev_export(dev, tpg, lun);
 636         if (ret < 0) {
 637                 percpu_ref_exit(&lun->lun_ref);
 638                 return ret;
 639         }
 640
 641         mutex_lock(&tpg->tpg_lun_mutex);
 642         lun->lun_access = lun_access;
 643         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 644         if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
 645                 hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
 646         mutex_unlock(&tpg->tpg_lun_mutex);
 647
 648         return 0;
 649 }
 650
 651 void core_tpg_remove_lun(
 652         struct se_portal_group *tpg,
 653         struct se_lun *lun)
 654 {
 655         struct se_device *dev = lun->lun_se_dev;
 656
 657         core_clear_lun_from_tpg(lun, tpg);
 658         transport_clear_lun_ref(lun);
 659
 660         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 661
 662         mutex_lock(&tpg->tpg_lun_mutex);
 663         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 664         if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
 665                 hlist_del_rcu(&lun->link);
 666         mutex_unlock(&tpg->tpg_lun_mutex);
 667
 668         percpu_ref_exit(&lun->lun_ref);
 669 }