1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_tpg.c 4 * 5 * This file contains generic Target Portal Group related functions. 6 * 7 * (c) Copyright 2002-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13 #include <linux/net.h> 14 #include <linux/string.h> 15 #include <linux/timer.h> 16 #include <linux/slab.h> 17 #include <linux/spinlock.h> 18 #include <linux/in.h> 19 #include <linux/export.h> 20 #include <net/sock.h> 21 #include <net/tcp.h> 22 #include <scsi/scsi_proto.h> 23 24 #include <target/target_core_base.h> 25 #include <target/target_core_backend.h> 26 #include <target/target_core_fabric.h> 27 28 #include "target_core_internal.h" 29 #include "target_core_alua.h" 30 #include "target_core_pr.h" 31 #include "target_core_ua.h" 32 33 extern struct se_device *g_lun0_dev; 34 35 static DEFINE_SPINLOCK(tpg_lock); 36 static LIST_HEAD(tpg_list); 37 38 /* __core_tpg_get_initiator_node_acl(): 39 * 40 * mutex_lock(&tpg->acl_node_mutex); must be held when calling 41 */ 42 struct se_node_acl *__core_tpg_get_initiator_node_acl( 43 struct se_portal_group *tpg, 44 const char *initiatorname) 45 { 46 struct se_node_acl *acl; 47 48 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 49 if (!strcmp(acl->initiatorname, initiatorname)) 50 return acl; 51 } 52 53 return NULL; 54 } 55 56 /* core_tpg_get_initiator_node_acl(): 57 * 58 * 59 */ 60 struct se_node_acl *core_tpg_get_initiator_node_acl( 61 struct se_portal_group *tpg, 62 unsigned char *initiatorname) 63 { 64 struct se_node_acl *acl; 65 /* 66 * Obtain se_node_acl->acl_kref using fabric driver provided 67 * initiatorname[] during node acl endpoint lookup driven by 68 * new se_session login. 69 * 70 * The reference is held until se_session shutdown -> release 71 * occurs via fabric driver invoked transport_deregister_session() 72 * or transport_free_session() code. 73 */ 74 mutex_lock(&tpg->acl_node_mutex); 75 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); 76 if (acl) { 77 if (!kref_get_unless_zero(&acl->acl_kref)) 78 acl = NULL; 79 } 80 mutex_unlock(&tpg->acl_node_mutex); 81 82 return acl; 83 } 84 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); 85 86 void core_allocate_nexus_loss_ua( 87 struct se_node_acl *nacl) 88 { 89 struct se_dev_entry *deve; 90 91 if (!nacl) 92 return; 93 94 rcu_read_lock(); 95 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) 96 core_scsi3_ua_allocate(deve, 0x29, 97 ASCQ_29H_NEXUS_LOSS_OCCURRED); 98 rcu_read_unlock(); 99 } 100 EXPORT_SYMBOL(core_allocate_nexus_loss_ua); 101 102 /* core_tpg_add_node_to_devs(): 103 * 104 * 105 */ 106 void core_tpg_add_node_to_devs( 107 struct se_node_acl *acl, 108 struct se_portal_group *tpg, 109 struct se_lun *lun_orig) 110 { 111 bool lun_access_ro = true; 112 struct se_lun *lun; 113 struct se_device *dev; 114 115 mutex_lock(&tpg->tpg_lun_mutex); 116 hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) { 117 if (lun_orig && lun != lun_orig) 118 continue; 119 120 dev = rcu_dereference_check(lun->lun_se_dev, 121 lockdep_is_held(&tpg->tpg_lun_mutex)); 122 /* 123 * By default in LIO-Target $FABRIC_MOD, 124 * demo_mode_write_protect is ON, or READ_ONLY; 125 */ 126 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { 127 lun_access_ro = false; 128 } else { 129 /* 130 * Allow only optical drives to issue R/W in default RO 131 * demo mode. 132 */ 133 if (dev->transport->get_device_type(dev) == TYPE_DISK) 134 lun_access_ro = true; 135 else 136 lun_access_ro = false; 137 } 138 139 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s" 140 " access for LUN in Demo Mode\n", 141 tpg->se_tpg_tfo->fabric_name, 142 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 143 lun_access_ro ? "READ-ONLY" : "READ-WRITE"); 144 145 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, 146 lun_access_ro, acl, tpg); 147 /* 148 * Check to see if there are any existing persistent reservation 149 * APTPL pre-registrations that need to be enabled for this dynamic 150 * LUN ACL now.. 151 */ 152 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl, 153 lun->unpacked_lun); 154 } 155 mutex_unlock(&tpg->tpg_lun_mutex); 156 } 157 158 static void 159 target_set_nacl_queue_depth(struct se_portal_group *tpg, 160 struct se_node_acl *acl, u32 queue_depth) 161 { 162 acl->queue_depth = queue_depth; 163 164 if (!acl->queue_depth) { 165 pr_warn("Queue depth for %s Initiator Node: %s is 0," 166 "defaulting to 1.\n", tpg->se_tpg_tfo->fabric_name, 167 acl->initiatorname); 168 acl->queue_depth = 1; 169 } 170 } 171 172 static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg, 173 const unsigned char *initiatorname) 174 { 175 struct se_node_acl *acl; 176 u32 queue_depth; 177 178 acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size), 179 GFP_KERNEL); 180 if (!acl) 181 return NULL; 182 183 INIT_LIST_HEAD(&acl->acl_list); 184 INIT_LIST_HEAD(&acl->acl_sess_list); 185 INIT_HLIST_HEAD(&acl->lun_entry_hlist); 186 kref_init(&acl->acl_kref); 187 init_completion(&acl->acl_free_comp); 188 spin_lock_init(&acl->nacl_sess_lock); 189 mutex_init(&acl->lun_entry_mutex); 190 atomic_set(&acl->acl_pr_ref_count, 0); 191 192 if (tpg->se_tpg_tfo->tpg_get_default_depth) 193 queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); 194 else 195 queue_depth = 1; 196 target_set_nacl_queue_depth(tpg, acl, queue_depth); 197 198 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); 199 acl->se_tpg = tpg; 200 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); 201 202 tpg->se_tpg_tfo->set_default_node_attributes(acl); 203 204 return acl; 205 } 206 207 static void target_add_node_acl(struct se_node_acl *acl) 208 { 209 struct se_portal_group *tpg = acl->se_tpg; 210 211 mutex_lock(&tpg->acl_node_mutex); 212 list_add_tail(&acl->acl_list, &tpg->acl_node_list); 213 mutex_unlock(&tpg->acl_node_mutex); 214 215 pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s" 216 " Initiator Node: %s\n", 217 tpg->se_tpg_tfo->fabric_name, 218 tpg->se_tpg_tfo->tpg_get_tag(tpg), 219 acl->dynamic_node_acl ? "DYNAMIC" : "", 220 acl->queue_depth, 221 tpg->se_tpg_tfo->fabric_name, 222 acl->initiatorname); 223 } 224 225 bool target_tpg_has_node_acl(struct se_portal_group *tpg, 226 const char *initiatorname) 227 { 228 struct se_node_acl *acl; 229 bool found = false; 230 231 mutex_lock(&tpg->acl_node_mutex); 232 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 233 if (!strcmp(acl->initiatorname, initiatorname)) { 234 found = true; 235 break; 236 } 237 } 238 mutex_unlock(&tpg->acl_node_mutex); 239 240 return found; 241 } 242 EXPORT_SYMBOL(target_tpg_has_node_acl); 243 244 struct se_node_acl *core_tpg_check_initiator_node_acl( 245 struct se_portal_group *tpg, 246 unsigned char *initiatorname) 247 { 248 struct se_node_acl *acl; 249 250 acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); 251 if (acl) 252 return acl; 253 254 if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) 255 return NULL; 256 257 acl = target_alloc_node_acl(tpg, initiatorname); 258 if (!acl) 259 return NULL; 260 /* 261 * When allocating a dynamically generated node_acl, go ahead 262 * and take the extra kref now before returning to the fabric 263 * driver caller. 264 * 265 * Note this reference will be released at session shutdown 266 * time within transport_free_session() code. 267 */ 268 kref_get(&acl->acl_kref); 269 acl->dynamic_node_acl = 1; 270 271 /* 272 * Here we only create demo-mode MappedLUNs from the active 273 * TPG LUNs if the fabric is not explicitly asking for 274 * tpg_check_demo_mode_login_only() == 1. 275 */ 276 if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || 277 (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) 278 core_tpg_add_node_to_devs(acl, tpg, NULL); 279 280 target_add_node_acl(acl); 281 return acl; 282 } 283 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); 284 285 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) 286 { 287 while (atomic_read(&nacl->acl_pr_ref_count) != 0) 288 cpu_relax(); 289 } 290 291 struct se_node_acl *core_tpg_add_initiator_node_acl( 292 struct se_portal_group *tpg, 293 const char *initiatorname) 294 { 295 struct se_node_acl *acl; 296 297 mutex_lock(&tpg->acl_node_mutex); 298 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); 299 if (acl) { 300 if (acl->dynamic_node_acl) { 301 acl->dynamic_node_acl = 0; 302 pr_debug("%s_TPG[%u] - Replacing dynamic ACL" 303 " for %s\n", tpg->se_tpg_tfo->fabric_name, 304 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); 305 mutex_unlock(&tpg->acl_node_mutex); 306 return acl; 307 } 308 309 pr_err("ACL entry for %s Initiator" 310 " Node %s already exists for TPG %u, ignoring" 311 " request.\n", tpg->se_tpg_tfo->fabric_name, 312 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); 313 mutex_unlock(&tpg->acl_node_mutex); 314 return ERR_PTR(-EEXIST); 315 } 316 mutex_unlock(&tpg->acl_node_mutex); 317 318 acl = target_alloc_node_acl(tpg, initiatorname); 319 if (!acl) 320 return ERR_PTR(-ENOMEM); 321 322 target_add_node_acl(acl); 323 return acl; 324 } 325 326 static void target_shutdown_sessions(struct se_node_acl *acl) 327 { 328 struct se_session *sess; 329 unsigned long flags; 330 331 restart: 332 spin_lock_irqsave(&acl->nacl_sess_lock, flags); 333 list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) { 334 if (sess->sess_tearing_down) 335 continue; 336 337 list_del_init(&sess->sess_acl_list); 338 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); 339 340 if (acl->se_tpg->se_tpg_tfo->close_session) 341 acl->se_tpg->se_tpg_tfo->close_session(sess); 342 goto restart; 343 } 344 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); 345 } 346 347 void core_tpg_del_initiator_node_acl(struct se_node_acl *acl) 348 { 349 struct se_portal_group *tpg = acl->se_tpg; 350 351 mutex_lock(&tpg->acl_node_mutex); 352 if (acl->dynamic_node_acl) 353 acl->dynamic_node_acl = 0; 354 list_del_init(&acl->acl_list); 355 mutex_unlock(&tpg->acl_node_mutex); 356 357 target_shutdown_sessions(acl); 358 359 target_put_nacl(acl); 360 /* 361 * Wait for last target_put_nacl() to complete in target_complete_nacl() 362 * for active fabric session transport_deregister_session() callbacks. 363 */ 364 wait_for_completion(&acl->acl_free_comp); 365 366 core_tpg_wait_for_nacl_pr_ref(acl); 367 core_free_device_list_for_node(acl, tpg); 368 369 pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" 370 " Initiator Node: %s\n", tpg->se_tpg_tfo->fabric_name, 371 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, 372 tpg->se_tpg_tfo->fabric_name, acl->initiatorname); 373 374 kfree(acl); 375 } 376 377 /* core_tpg_set_initiator_node_queue_depth(): 378 * 379 * 380 */ 381 int core_tpg_set_initiator_node_queue_depth( 382 struct se_node_acl *acl, 383 u32 queue_depth) 384 { 385 struct se_portal_group *tpg = acl->se_tpg; 386 387 /* 388 * Allow the setting of se_node_acl queue_depth to be idempotent, 389 * and not force a session shutdown event if the value is not 390 * changing. 391 */ 392 if (acl->queue_depth == queue_depth) 393 return 0; 394 /* 395 * User has requested to change the queue depth for a Initiator Node. 396 * Change the value in the Node's struct se_node_acl, and call 397 * target_set_nacl_queue_depth() to set the new queue depth. 398 */ 399 target_set_nacl_queue_depth(tpg, acl, queue_depth); 400 401 /* 402 * Shutdown all pending sessions to force session reinstatement. 403 */ 404 target_shutdown_sessions(acl); 405 406 pr_debug("Successfully changed queue depth to: %d for Initiator" 407 " Node: %s on %s Target Portal Group: %u\n", acl->queue_depth, 408 acl->initiatorname, tpg->se_tpg_tfo->fabric_name, 409 tpg->se_tpg_tfo->tpg_get_tag(tpg)); 410 411 return 0; 412 } 413 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); 414 415 /* core_tpg_set_initiator_node_tag(): 416 * 417 * Initiator nodeacl tags are not used internally, but may be used by 418 * userspace to emulate aliases or groups. 419 * Returns length of newly-set tag or -EINVAL. 420 */ 421 int core_tpg_set_initiator_node_tag( 422 struct se_portal_group *tpg, 423 struct se_node_acl *acl, 424 const char *new_tag) 425 { 426 if (strlen(new_tag) >= MAX_ACL_TAG_SIZE) 427 return -EINVAL; 428 429 if (!strncmp("NULL", new_tag, 4)) { 430 acl->acl_tag[0] = '\0'; 431 return 0; 432 } 433 434 return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag); 435 } 436 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag); 437 438 static void core_tpg_lun_ref_release(struct percpu_ref *ref) 439 { 440 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); 441 442 complete(&lun->lun_shutdown_comp); 443 } 444 445 /* Does not change se_wwn->priv. */ 446 int core_tpg_register( 447 struct se_wwn *se_wwn, 448 struct se_portal_group *se_tpg, 449 int proto_id) 450 { 451 int ret; 452 453 if (!se_tpg) 454 return -EINVAL; 455 /* 456 * For the typical case where core_tpg_register() is called by a 457 * fabric driver from target_core_fabric_ops->fabric_make_tpg() 458 * configfs context, use the original tf_ops pointer already saved 459 * by target-core in target_fabric_make_wwn(). 460 * 461 * Otherwise, for special cases like iscsi-target discovery TPGs 462 * the caller is responsible for setting ->se_tpg_tfo ahead of 463 * calling core_tpg_register(). 464 */ 465 if (se_wwn) 466 se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops; 467 468 if (!se_tpg->se_tpg_tfo) { 469 pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n"); 470 return -EINVAL; 471 } 472 473 INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist); 474 se_tpg->proto_id = proto_id; 475 se_tpg->se_tpg_wwn = se_wwn; 476 atomic_set(&se_tpg->tpg_pr_ref_count, 0); 477 INIT_LIST_HEAD(&se_tpg->acl_node_list); 478 INIT_LIST_HEAD(&se_tpg->se_tpg_node); 479 INIT_LIST_HEAD(&se_tpg->tpg_sess_list); 480 spin_lock_init(&se_tpg->session_lock); 481 mutex_init(&se_tpg->tpg_lun_mutex); 482 mutex_init(&se_tpg->acl_node_mutex); 483 484 if (se_tpg->proto_id >= 0) { 485 se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0); 486 if (IS_ERR(se_tpg->tpg_virt_lun0)) 487 return PTR_ERR(se_tpg->tpg_virt_lun0); 488 489 ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0, 490 true, g_lun0_dev); 491 if (ret < 0) { 492 kfree(se_tpg->tpg_virt_lun0); 493 return ret; 494 } 495 } 496 497 spin_lock_bh(&tpg_lock); 498 list_add_tail(&se_tpg->se_tpg_node, &tpg_list); 499 spin_unlock_bh(&tpg_lock); 500 501 pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, " 502 "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->fabric_name, 503 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ? 504 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL, 505 se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 506 507 return 0; 508 } 509 EXPORT_SYMBOL(core_tpg_register); 510 511 int core_tpg_deregister(struct se_portal_group *se_tpg) 512 { 513 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; 514 struct se_node_acl *nacl, *nacl_tmp; 515 LIST_HEAD(node_list); 516 517 pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, " 518 "Proto: %d, Portal Tag: %u\n", tfo->fabric_name, 519 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL, 520 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg)); 521 522 spin_lock_bh(&tpg_lock); 523 list_del(&se_tpg->se_tpg_node); 524 spin_unlock_bh(&tpg_lock); 525 526 while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) 527 cpu_relax(); 528 529 mutex_lock(&se_tpg->acl_node_mutex); 530 list_splice_init(&se_tpg->acl_node_list, &node_list); 531 mutex_unlock(&se_tpg->acl_node_mutex); 532 /* 533 * Release any remaining demo-mode generated se_node_acl that have 534 * not been released because of TFO->tpg_check_demo_mode_cache() == 1 535 * in transport_deregister_session(). 536 */ 537 list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) { 538 list_del_init(&nacl->acl_list); 539 540 core_tpg_wait_for_nacl_pr_ref(nacl); 541 core_free_device_list_for_node(nacl, se_tpg); 542 kfree(nacl); 543 } 544 545 if (se_tpg->proto_id >= 0) { 546 core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0); 547 kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head); 548 } 549 550 return 0; 551 } 552 EXPORT_SYMBOL(core_tpg_deregister); 553 554 struct se_lun *core_tpg_alloc_lun( 555 struct se_portal_group *tpg, 556 u64 unpacked_lun) 557 { 558 struct se_lun *lun; 559 560 lun = kzalloc(sizeof(*lun), GFP_KERNEL); 561 if (!lun) { 562 pr_err("Unable to allocate se_lun memory\n"); 563 return ERR_PTR(-ENOMEM); 564 } 565 lun->unpacked_lun = unpacked_lun; 566 atomic_set(&lun->lun_acl_count, 0); 567 init_completion(&lun->lun_shutdown_comp); 568 INIT_LIST_HEAD(&lun->lun_deve_list); 569 INIT_LIST_HEAD(&lun->lun_dev_link); 570 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 571 spin_lock_init(&lun->lun_deve_lock); 572 mutex_init(&lun->lun_tg_pt_md_mutex); 573 INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link); 574 spin_lock_init(&lun->lun_tg_pt_gp_lock); 575 lun->lun_tpg = tpg; 576 577 return lun; 578 } 579 580 int core_tpg_add_lun( 581 struct se_portal_group *tpg, 582 struct se_lun *lun, 583 bool lun_access_ro, 584 struct se_device *dev) 585 { 586 int ret; 587 588 ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0, 589 GFP_KERNEL); 590 if (ret < 0) 591 goto out; 592 593 ret = core_alloc_rtpi(lun, dev); 594 if (ret) 595 goto out_kill_ref; 596 597 if (!(dev->transport->transport_flags & 598 TRANSPORT_FLAG_PASSTHROUGH_ALUA) && 599 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 600 target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp); 601 602 mutex_lock(&tpg->tpg_lun_mutex); 603 604 spin_lock(&dev->se_port_lock); 605 lun->lun_index = dev->dev_index; 606 rcu_assign_pointer(lun->lun_se_dev, dev); 607 dev->export_count++; 608 list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list); 609 spin_unlock(&dev->se_port_lock); 610 611 if (dev->dev_flags & DF_READ_ONLY) 612 lun->lun_access_ro = true; 613 else 614 lun->lun_access_ro = lun_access_ro; 615 if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 616 hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist); 617 mutex_unlock(&tpg->tpg_lun_mutex); 618 619 return 0; 620 621 out_kill_ref: 622 percpu_ref_exit(&lun->lun_ref); 623 out: 624 return ret; 625 } 626 627 void core_tpg_remove_lun( 628 struct se_portal_group *tpg, 629 struct se_lun *lun) 630 { 631 /* 632 * rcu_dereference_raw protected by se_lun->lun_group symlink 633 * reference to se_device->dev_group. 634 */ 635 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 636 637 lun->lun_shutdown = true; 638 639 core_clear_lun_from_tpg(lun, tpg); 640 /* 641 * Wait for any active I/O references to percpu se_lun->lun_ref to 642 * be released. Also, se_lun->lun_ref is now used by PR and ALUA 643 * logic when referencing a remote target port during ALL_TGT_PT=1 644 * and generating UNIT_ATTENTIONs for ALUA access state transition. 645 */ 646 transport_clear_lun_ref(lun); 647 648 mutex_lock(&tpg->tpg_lun_mutex); 649 if (lun->lun_se_dev) { 650 target_detach_tg_pt_gp(lun); 651 652 spin_lock(&dev->se_port_lock); 653 list_del(&lun->lun_dev_link); 654 dev->export_count--; 655 rcu_assign_pointer(lun->lun_se_dev, NULL); 656 spin_unlock(&dev->se_port_lock); 657 } 658 if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 659 hlist_del_rcu(&lun->link); 660 661 lun->lun_shutdown = false; 662 mutex_unlock(&tpg->tpg_lun_mutex); 663 664 percpu_ref_exit(&lun->lun_ref); 665 } 666