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_proto.h>
  36
  37 #include <target/target_core_base.h>
  38 #include <target/target_core_backend.h>
  39 #include <target/target_core_fabric.h>
  40
  41 #include "target_core_internal.h"
  42 #include "target_core_alua.h"
  43 #include "target_core_pr.h"
  44 #include "target_core_ua.h"
  45
  46 extern struct se_device *g_lun0_dev;
  47
  48 static DEFINE_SPINLOCK(tpg_lock);
  49 static LIST_HEAD(tpg_list);
  50
  51 /*      __core_tpg_get_initiator_node_acl():
  52  *
  53  *      mutex_lock(&tpg->acl_node_mutex); must be held when calling
  54  */
  55 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  56         struct se_portal_group *tpg,
  57         const char *initiatorname)
  58 {
  59         struct se_node_acl *acl;
  60
  61         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  62                 if (!strcmp(acl->initiatorname, initiatorname))
  63                         return acl;
  64         }
  65
  66         return NULL;
  67 }
  68
  69 /*      core_tpg_get_initiator_node_acl():
  70  *
  71  *
  72  */
  73 struct se_node_acl *core_tpg_get_initiator_node_acl(
  74         struct se_portal_group *tpg,
  75         unsigned char *initiatorname)
  76 {
  77         struct se_node_acl *acl;
  78         /*
  79          * Obtain se_node_acl->acl_kref using fabric driver provided
  80          * initiatorname[] during node acl endpoint lookup driven by
  81          * new se_session login.
  82          *
  83          * The reference is held until se_session shutdown -> release
  84          * occurs via fabric driver invoked transport_deregister_session()
  85          * or transport_free_session() code.
  86          */
  87         mutex_lock(&tpg->acl_node_mutex);
  88         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
  89         if (acl) {
  90                 if (!kref_get_unless_zero(&acl->acl_kref))
  91                         acl = NULL;
  92         }
  93         mutex_unlock(&tpg->acl_node_mutex);
  94
  95         return acl;
  96 }
  97 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
  98
  99 void core_allocate_nexus_loss_ua(
 100         struct se_node_acl *nacl)
 101 {
 102         struct se_dev_entry *deve;
 103
 104         if (!nacl)
 105                 return;
 106
 107         rcu_read_lock();
 108         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
 109                 core_scsi3_ua_allocate(deve, 0x29,
 110                         ASCQ_29H_NEXUS_LOSS_OCCURRED);
 111         rcu_read_unlock();
 112 }
 113 EXPORT_SYMBOL(core_allocate_nexus_loss_ua);
 114
 115 /*      core_tpg_add_node_to_devs():
 116  *
 117  *
 118  */
 119 void core_tpg_add_node_to_devs(
 120         struct se_node_acl *acl,
 121         struct se_portal_group *tpg,
 122         struct se_lun *lun_orig)
 123 {
 124         u32 lun_access = 0;
 125         struct se_lun *lun;
 126         struct se_device *dev;
 127
 128         mutex_lock(&tpg->tpg_lun_mutex);
 129         hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
 130                 if (lun_orig && lun != lun_orig)
 131                         continue;
 132
 133                 dev = rcu_dereference_check(lun->lun_se_dev,
 134                                             lockdep_is_held(&tpg->tpg_lun_mutex));
 135                 /*
 136                  * By default in LIO-Target $FABRIC_MOD,
 137                  * demo_mode_write_protect is ON, or READ_ONLY;
 138                  */
 139                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 140                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 141                 } else {
 142                         /*
 143                          * Allow only optical drives to issue R/W in default RO
 144                          * demo mode.
 145                          */
 146                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 147                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 148                         else
 149                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 150                 }
 151
 152                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s"
 153                         " access for LUN in Demo Mode\n",
 154                         tpg->se_tpg_tfo->get_fabric_name(),
 155                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 156                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 157                         "READ-WRITE" : "READ-ONLY");
 158
 159                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 160                                                  lun_access, acl, tpg);
 161                 /*
 162                  * Check to see if there are any existing persistent reservation
 163                  * APTPL pre-registrations that need to be enabled for this dynamic
 164                  * LUN ACL now..
 165                  */
 166                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 167                                                     lun->unpacked_lun);
 168         }
 169         mutex_unlock(&tpg->tpg_lun_mutex);
 170 }
 171
 172 /*      core_set_queue_depth_for_node():
 173  *
 174  *
 175  */
 176 static int core_set_queue_depth_for_node(
 177         struct se_portal_group *tpg,
 178         struct se_node_acl *acl)
 179 {
 180         if (!acl->queue_depth) {
 181                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 182                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 183                         acl->initiatorname);
 184                 acl->queue_depth = 1;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
 191                 const unsigned char *initiatorname)
 192 {
 193         struct se_node_acl *acl;
 194
 195         acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
 196                         GFP_KERNEL);
 197         if (!acl)
 198                 return NULL;
 199
 200         INIT_LIST_HEAD(&acl->acl_list);
 201         INIT_LIST_HEAD(&acl->acl_sess_list);
 202         INIT_HLIST_HEAD(&acl->lun_entry_hlist);
 203         kref_init(&acl->acl_kref);
 204         init_completion(&acl->acl_free_comp);
 205         spin_lock_init(&acl->nacl_sess_lock);
 206         mutex_init(&acl->lun_entry_mutex);
 207         atomic_set(&acl->acl_pr_ref_count, 0);
 208         if (tpg->se_tpg_tfo->tpg_get_default_depth)
 209                 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 210         else
 211                 acl->queue_depth = 1;
 212         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 213         acl->se_tpg = tpg;
 214         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 215
 216         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 217
 218         if (core_set_queue_depth_for_node(tpg, acl) < 0)
 219                 goto out_free_acl;
 220
 221         return acl;
 222
 223 out_free_acl:
 224         kfree(acl);
 225         return NULL;
 226 }
 227
 228 static void target_add_node_acl(struct se_node_acl *acl)
 229 {
 230         struct se_portal_group *tpg = acl->se_tpg;
 231
 232         mutex_lock(&tpg->acl_node_mutex);
 233         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 234         tpg->num_node_acls++;
 235         mutex_unlock(&tpg->acl_node_mutex);
 236
 237         pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
 238                 " Initiator Node: %s\n",
 239                 tpg->se_tpg_tfo->get_fabric_name(),
 240                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 241                 acl->dynamic_node_acl ? "DYNAMIC" : "",
 242                 acl->queue_depth,
 243                 tpg->se_tpg_tfo->get_fabric_name(),
 244                 acl->initiatorname);
 245 }
 246
 247 bool target_tpg_has_node_acl(struct se_portal_group *tpg,
 248                              const char *initiatorname)
 249 {
 250         struct se_node_acl *acl;
 251         bool found = false;
 252
 253         mutex_lock(&tpg->acl_node_mutex);
 254         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 255                 if (!strcmp(acl->initiatorname, initiatorname)) {
 256                         found = true;
 257                         break;
 258                 }
 259         }
 260         mutex_unlock(&tpg->acl_node_mutex);
 261
 262         return found;
 263 }
 264 EXPORT_SYMBOL(target_tpg_has_node_acl);
 265
 266 struct se_node_acl *core_tpg_check_initiator_node_acl(
 267         struct se_portal_group *tpg,
 268         unsigned char *initiatorname)
 269 {
 270         struct se_node_acl *acl;
 271
 272         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 273         if (acl)
 274                 return acl;
 275
 276         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 277                 return NULL;
 278
 279         acl = target_alloc_node_acl(tpg, initiatorname);
 280         if (!acl)
 281                 return NULL;
 282         /*
 283          * When allocating a dynamically generated node_acl, go ahead
 284          * and take the extra kref now before returning to the fabric
 285          * driver caller.
 286          *
 287          * Note this reference will be released at session shutdown
 288          * time within transport_free_session() code.
 289          */
 290         kref_get(&acl->acl_kref);
 291         acl->dynamic_node_acl = 1;
 292
 293         /*
 294          * Here we only create demo-mode MappedLUNs from the active
 295          * TPG LUNs if the fabric is not explicitly asking for
 296          * tpg_check_demo_mode_login_only() == 1.
 297          */
 298         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 299             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 300                 core_tpg_add_node_to_devs(acl, tpg, NULL);
 301
 302         target_add_node_acl(acl);
 303         return acl;
 304 }
 305 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 306
 307 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 308 {
 309         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 310                 cpu_relax();
 311 }
 312
 313 struct se_node_acl *core_tpg_add_initiator_node_acl(
 314         struct se_portal_group *tpg,
 315         const char *initiatorname)
 316 {
 317         struct se_node_acl *acl;
 318
 319         mutex_lock(&tpg->acl_node_mutex);
 320         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 321         if (acl) {
 322                 if (acl->dynamic_node_acl) {
 323                         acl->dynamic_node_acl = 0;
 324                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 325                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 326                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 327                         mutex_unlock(&tpg->acl_node_mutex);
 328                         return acl;
 329                 }
 330
 331                 pr_err("ACL entry for %s Initiator"
 332                         " Node %s already exists for TPG %u, ignoring"
 333                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 334                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 335                 mutex_unlock(&tpg->acl_node_mutex);
 336                 return ERR_PTR(-EEXIST);
 337         }
 338         mutex_unlock(&tpg->acl_node_mutex);
 339
 340         acl = target_alloc_node_acl(tpg, initiatorname);
 341         if (!acl)
 342                 return ERR_PTR(-ENOMEM);
 343
 344         target_add_node_acl(acl);
 345         return acl;
 346 }
 347
 348 void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
 349 {
 350         struct se_portal_group *tpg = acl->se_tpg;
 351         LIST_HEAD(sess_list);
 352         struct se_session *sess, *sess_tmp;
 353         unsigned long flags;
 354         int rc;
 355
 356         mutex_lock(&tpg->acl_node_mutex);
 357         if (acl->dynamic_node_acl) {
 358                 acl->dynamic_node_acl = 0;
 359         }
 360         list_del(&acl->acl_list);
 361         tpg->num_node_acls--;
 362         mutex_unlock(&tpg->acl_node_mutex);
 363
 364         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 365         acl->acl_stop = 1;
 366
 367         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 368                                 sess_acl_list) {
 369                 if (sess->sess_tearing_down != 0)
 370                         continue;
 371
 372                 target_get_session(sess);
 373                 list_move(&sess->sess_acl_list, &sess_list);
 374         }
 375         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 376
 377         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 378                 list_del(&sess->sess_acl_list);
 379
 380                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 381                 target_put_session(sess);
 382                 if (!rc)
 383                         continue;
 384                 target_put_session(sess);
 385         }
 386         target_put_nacl(acl);
 387         /*
 388          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 389          * for active fabric session transport_deregister_session() callbacks.
 390          */
 391         wait_for_completion(&acl->acl_free_comp);
 392
 393         core_tpg_wait_for_nacl_pr_ref(acl);
 394         core_free_device_list_for_node(acl, tpg);
 395
 396         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 397                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 398                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 399                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 400
 401         kfree(acl);
 402 }
 403
 404 /*      core_tpg_set_initiator_node_queue_depth():
 405  *
 406  *
 407  */
 408 int core_tpg_set_initiator_node_queue_depth(
 409         struct se_portal_group *tpg,
 410         unsigned char *initiatorname,
 411         u32 queue_depth,
 412         int force)
 413 {
 414         struct se_session *sess, *init_sess = NULL;
 415         struct se_node_acl *acl;
 416         unsigned long flags;
 417         int dynamic_acl = 0;
 418
 419         mutex_lock(&tpg->acl_node_mutex);
 420         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 421         if (!acl) {
 422                 pr_err("Access Control List entry for %s Initiator"
 423                         " Node %s does not exists for TPG %hu, ignoring"
 424                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 425                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 426                 mutex_unlock(&tpg->acl_node_mutex);
 427                 return -ENODEV;
 428         }
 429         if (acl->dynamic_node_acl) {
 430                 acl->dynamic_node_acl = 0;
 431                 dynamic_acl = 1;
 432         }
 433         mutex_unlock(&tpg->acl_node_mutex);
 434
 435         spin_lock_irqsave(&tpg->session_lock, flags);
 436         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 437                 if (sess->se_node_acl != acl)
 438                         continue;
 439
 440                 if (!force) {
 441                         pr_err("Unable to change queue depth for %s"
 442                                 " Initiator Node: %s while session is"
 443                                 " operational.  To forcefully change the queue"
 444                                 " depth and force session reinstatement"
 445                                 " use the \"force=1\" parameter.\n",
 446                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 447                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 448
 449                         mutex_lock(&tpg->acl_node_mutex);
 450                         if (dynamic_acl)
 451                                 acl->dynamic_node_acl = 1;
 452                         mutex_unlock(&tpg->acl_node_mutex);
 453                         return -EEXIST;
 454                 }
 455                 /*
 456                  * Determine if the session needs to be closed by our context.
 457                  */
 458                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 459                         continue;
 460
 461                 init_sess = sess;
 462                 break;
 463         }
 464
 465         /*
 466          * User has requested to change the queue depth for a Initiator Node.
 467          * Change the value in the Node's struct se_node_acl, and call
 468          * core_set_queue_depth_for_node() to add the requested queue depth.
 469          *
 470          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 471          * reinstatement to occur if there is an active session for the
 472          * $FABRIC_MOD Initiator Node in question.
 473          */
 474         acl->queue_depth = queue_depth;
 475
 476         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 477                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 478                 /*
 479                  * Force session reinstatement if
 480                  * core_set_queue_depth_for_node() failed, because we assume
 481                  * the $FABRIC_MOD has already the set session reinstatement
 482                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 483                  */
 484                 if (init_sess)
 485                         tpg->se_tpg_tfo->close_session(init_sess);
 486
 487                 mutex_lock(&tpg->acl_node_mutex);
 488                 if (dynamic_acl)
 489                         acl->dynamic_node_acl = 1;
 490                 mutex_unlock(&tpg->acl_node_mutex);
 491                 return -EINVAL;
 492         }
 493         spin_unlock_irqrestore(&tpg->session_lock, flags);
 494         /*
 495          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 496          * forcefully shutdown the $FABRIC_MOD session/nexus.
 497          */
 498         if (init_sess)
 499                 tpg->se_tpg_tfo->close_session(init_sess);
 500
 501         pr_debug("Successfully changed queue depth to: %d for Initiator"
 502                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 503                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 504                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 505
 506         mutex_lock(&tpg->acl_node_mutex);
 507         if (dynamic_acl)
 508                 acl->dynamic_node_acl = 1;
 509         mutex_unlock(&tpg->acl_node_mutex);
 510
 511         return 0;
 512 }
 513 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 514
 515 /*      core_tpg_set_initiator_node_tag():
 516  *
 517  *      Initiator nodeacl tags are not used internally, but may be used by
 518  *      userspace to emulate aliases or groups.
 519  *      Returns length of newly-set tag or -EINVAL.
 520  */
 521 int core_tpg_set_initiator_node_tag(
 522         struct se_portal_group *tpg,
 523         struct se_node_acl *acl,
 524         const char *new_tag)
 525 {
 526         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 527                 return -EINVAL;
 528
 529         if (!strncmp("NULL", new_tag, 4)) {
 530                 acl->acl_tag[0] = '\0';
 531                 return 0;
 532         }
 533
 534         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 535 }
 536 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 537
 538 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 539 {
 540         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 541
 542         complete(&lun->lun_shutdown_comp);
 543 }
 544
 545 int core_tpg_register(
 546         struct se_wwn *se_wwn,
 547         struct se_portal_group *se_tpg,
 548         int proto_id)
 549 {
 550         int ret;
 551
 552         if (!se_tpg)
 553                 return -EINVAL;
 554         /*
 555          * For the typical case where core_tpg_register() is called by a
 556          * fabric driver from target_core_fabric_ops->fabric_make_tpg()
 557          * configfs context, use the original tf_ops pointer already saved
 558          * by target-core in target_fabric_make_wwn().
 559          *
 560          * Otherwise, for special cases like iscsi-target discovery TPGs
 561          * the caller is responsible for setting ->se_tpg_tfo ahead of
 562          * calling core_tpg_register().
 563          */
 564         if (se_wwn)
 565                 se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops;
 566
 567         if (!se_tpg->se_tpg_tfo) {
 568                 pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n");
 569                 return -EINVAL;
 570         }
 571
 572         INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist);
 573         se_tpg->proto_id = proto_id;
 574         se_tpg->se_tpg_wwn = se_wwn;
 575         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 576         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 577         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 578         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 579         spin_lock_init(&se_tpg->session_lock);
 580         mutex_init(&se_tpg->tpg_lun_mutex);
 581         mutex_init(&se_tpg->acl_node_mutex);
 582
 583         if (se_tpg->proto_id >= 0) {
 584                 se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0);
 585                 if (IS_ERR(se_tpg->tpg_virt_lun0))
 586                         return PTR_ERR(se_tpg->tpg_virt_lun0);
 587
 588                 ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0,
 589                                 TRANSPORT_LUNFLAGS_READ_ONLY, g_lun0_dev);
 590                 if (ret < 0) {
 591                         kfree(se_tpg->tpg_virt_lun0);
 592                         return ret;
 593                 }
 594         }
 595
 596         spin_lock_bh(&tpg_lock);
 597         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 598         spin_unlock_bh(&tpg_lock);
 599
 600         pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
 601                  "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->get_fabric_name(),
 602                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ?
 603                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL,
 604                 se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 605
 606         return 0;
 607 }
 608 EXPORT_SYMBOL(core_tpg_register);
 609
 610 int core_tpg_deregister(struct se_portal_group *se_tpg)
 611 {
 612         const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
 613         struct se_node_acl *nacl, *nacl_tmp;
 614         LIST_HEAD(node_list);
 615
 616         pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
 617                  "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(),
 618                 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
 619                 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
 620
 621         spin_lock_bh(&tpg_lock);
 622         list_del(&se_tpg->se_tpg_node);
 623         spin_unlock_bh(&tpg_lock);
 624
 625         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 626                 cpu_relax();
 627
 628         mutex_lock(&se_tpg->acl_node_mutex);
 629         list_splice_init(&se_tpg->acl_node_list, &node_list);
 630         mutex_unlock(&se_tpg->acl_node_mutex);
 631         /*
 632          * Release any remaining demo-mode generated se_node_acl that have
 633          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 634          * in transport_deregister_session().
 635          */
 636         list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) {
 637                 list_del(&nacl->acl_list);
 638                 se_tpg->num_node_acls--;
 639
 640                 core_tpg_wait_for_nacl_pr_ref(nacl);
 641                 core_free_device_list_for_node(nacl, se_tpg);
 642                 kfree(nacl);
 643         }
 644
 645         if (se_tpg->proto_id >= 0) {
 646                 core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0);
 647                 kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head);
 648         }
 649
 650         return 0;
 651 }
 652 EXPORT_SYMBOL(core_tpg_deregister);
 653
 654 struct se_lun *core_tpg_alloc_lun(
 655         struct se_portal_group *tpg,
 656         u64 unpacked_lun)
 657 {
 658         struct se_lun *lun;
 659
 660         lun = kzalloc(sizeof(*lun), GFP_KERNEL);
 661         if (!lun) {
 662                 pr_err("Unable to allocate se_lun memory\n");
 663                 return ERR_PTR(-ENOMEM);
 664         }
 665         lun->unpacked_lun = unpacked_lun;
 666         lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 667         atomic_set(&lun->lun_acl_count, 0);
 668         init_completion(&lun->lun_ref_comp);
 669         init_completion(&lun->lun_shutdown_comp);
 670         INIT_LIST_HEAD(&lun->lun_deve_list);
 671         INIT_LIST_HEAD(&lun->lun_dev_link);
 672         atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
 673         spin_lock_init(&lun->lun_deve_lock);
 674         mutex_init(&lun->lun_tg_pt_md_mutex);
 675         INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link);
 676         spin_lock_init(&lun->lun_tg_pt_gp_lock);
 677         lun->lun_tpg = tpg;
 678
 679         return lun;
 680 }
 681
 682 int core_tpg_add_lun(
 683         struct se_portal_group *tpg,
 684         struct se_lun *lun,
 685         u32 lun_access,
 686         struct se_device *dev)
 687 {
 688         int ret;
 689
 690         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 691                               GFP_KERNEL);
 692         if (ret < 0)
 693                 goto out;
 694
 695         ret = core_alloc_rtpi(lun, dev);
 696         if (ret)
 697                 goto out_kill_ref;
 698
 699         if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
 700             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
 701                 target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp);
 702
 703         mutex_lock(&tpg->tpg_lun_mutex);
 704
 705         spin_lock(&dev->se_port_lock);
 706         lun->lun_index = dev->dev_index;
 707         rcu_assign_pointer(lun->lun_se_dev, dev);
 708         dev->export_count++;
 709         list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list);
 710         spin_unlock(&dev->se_port_lock);
 711
 712         if (dev->dev_flags & DF_READ_ONLY)
 713                 lun->lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 714         else
 715                 lun->lun_access = lun_access;
 716         if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
 717                 hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
 718         mutex_unlock(&tpg->tpg_lun_mutex);
 719
 720         return 0;
 721
 722 out_kill_ref:
 723         percpu_ref_exit(&lun->lun_ref);
 724 out:
 725         return ret;
 726 }
 727
 728 void core_tpg_remove_lun(
 729         struct se_portal_group *tpg,
 730         struct se_lun *lun)
 731 {
 732         /*
 733          * rcu_dereference_raw protected by se_lun->lun_group symlink
 734          * reference to se_device->dev_group.
 735          */
 736         struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
 737
 738         core_clear_lun_from_tpg(lun, tpg);
 739         /*
 740          * Wait for any active I/O references to percpu se_lun->lun_ref to
 741          * be released.  Also, se_lun->lun_ref is now used by PR and ALUA
 742          * logic when referencing a remote target port during ALL_TGT_PT=1
 743          * and generating UNIT_ATTENTIONs for ALUA access state transition.
 744          */
 745         transport_clear_lun_ref(lun);
 746
 747         mutex_lock(&tpg->tpg_lun_mutex);
 748         if (lun->lun_se_dev) {
 749                 target_detach_tg_pt_gp(lun);
 750
 751                 spin_lock(&dev->se_port_lock);
 752                 list_del(&lun->lun_dev_link);
 753                 dev->export_count--;
 754                 rcu_assign_pointer(lun->lun_se_dev, NULL);
 755                 spin_unlock(&dev->se_port_lock);
 756         }
 757         if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
 758                 hlist_del_rcu(&lun->link);
 759         mutex_unlock(&tpg->tpg_lun_mutex);
 760
 761         percpu_ref_exit(&lun->lun_ref);
 762 }