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