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