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 44 extern struct se_device *g_lun0_dev; 45 46 static DEFINE_SPINLOCK(tpg_lock); 47 static LIST_HEAD(tpg_list); 48 49 /* core_clear_initiator_node_from_tpg(): 50 * 51 * 52 */ 53 static void core_clear_initiator_node_from_tpg( 54 struct se_node_acl *nacl, 55 struct se_portal_group *tpg) 56 { 57 int i; 58 struct se_dev_entry *deve; 59 struct se_lun *lun; 60 61 spin_lock_irq(&nacl->device_list_lock); 62 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { 63 deve = nacl->device_list[i]; 64 65 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)) 66 continue; 67 68 if (!deve->se_lun) { 69 pr_err("%s device entries device pointer is" 70 " NULL, but Initiator has access.\n", 71 tpg->se_tpg_tfo->get_fabric_name()); 72 continue; 73 } 74 75 lun = deve->se_lun; 76 spin_unlock_irq(&nacl->device_list_lock); 77 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun, 78 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg); 79 80 spin_lock_irq(&nacl->device_list_lock); 81 } 82 spin_unlock_irq(&nacl->device_list_lock); 83 } 84 85 /* __core_tpg_get_initiator_node_acl(): 86 * 87 * spin_lock_bh(&tpg->acl_node_lock); must be held when calling 88 */ 89 struct se_node_acl *__core_tpg_get_initiator_node_acl( 90 struct se_portal_group *tpg, 91 const char *initiatorname) 92 { 93 struct se_node_acl *acl; 94 95 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 96 if (!strcmp(acl->initiatorname, initiatorname)) 97 return acl; 98 } 99 100 return NULL; 101 } 102 103 /* core_tpg_get_initiator_node_acl(): 104 * 105 * 106 */ 107 struct se_node_acl *core_tpg_get_initiator_node_acl( 108 struct se_portal_group *tpg, 109 unsigned char *initiatorname) 110 { 111 struct se_node_acl *acl; 112 113 spin_lock_irq(&tpg->acl_node_lock); 114 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); 115 spin_unlock_irq(&tpg->acl_node_lock); 116 117 return acl; 118 } 119 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); 120 121 /* core_tpg_add_node_to_devs(): 122 * 123 * 124 */ 125 void core_tpg_add_node_to_devs( 126 struct se_node_acl *acl, 127 struct se_portal_group *tpg) 128 { 129 int i = 0; 130 u32 lun_access = 0; 131 struct se_lun *lun; 132 struct se_device *dev; 133 134 spin_lock(&tpg->tpg_lun_lock); 135 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { 136 lun = tpg->tpg_lun_list[i]; 137 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) 138 continue; 139 140 spin_unlock(&tpg->tpg_lun_lock); 141 142 dev = lun->lun_se_dev; 143 /* 144 * By default in LIO-Target $FABRIC_MOD, 145 * demo_mode_write_protect is ON, or READ_ONLY; 146 */ 147 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { 148 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; 149 } else { 150 /* 151 * Allow only optical drives to issue R/W in default RO 152 * demo mode. 153 */ 154 if (dev->transport->get_device_type(dev) == TYPE_DISK) 155 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; 156 else 157 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; 158 } 159 160 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s" 161 " access for LUN in Demo Mode\n", 162 tpg->se_tpg_tfo->get_fabric_name(), 163 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 164 (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? 165 "READ-WRITE" : "READ-ONLY"); 166 167 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, 168 lun_access, acl, tpg); 169 spin_lock(&tpg->tpg_lun_lock); 170 } 171 spin_unlock(&tpg->tpg_lun_lock); 172 } 173 174 /* core_set_queue_depth_for_node(): 175 * 176 * 177 */ 178 static int core_set_queue_depth_for_node( 179 struct se_portal_group *tpg, 180 struct se_node_acl *acl) 181 { 182 if (!acl->queue_depth) { 183 pr_err("Queue depth for %s Initiator Node: %s is 0," 184 "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(), 185 acl->initiatorname); 186 acl->queue_depth = 1; 187 } 188 189 return 0; 190 } 191 192 void array_free(void *array, int n) 193 { 194 void **a = array; 195 int i; 196 197 for (i = 0; i < n; i++) 198 kfree(a[i]); 199 kfree(a); 200 } 201 202 static void *array_zalloc(int n, size_t size, gfp_t flags) 203 { 204 void **a; 205 int i; 206 207 a = kzalloc(n * sizeof(void*), flags); 208 if (!a) 209 return NULL; 210 for (i = 0; i < n; i++) { 211 a[i] = kzalloc(size, flags); 212 if (!a[i]) { 213 array_free(a, n); 214 return NULL; 215 } 216 } 217 return a; 218 } 219 220 /* core_create_device_list_for_node(): 221 * 222 * 223 */ 224 static int core_create_device_list_for_node(struct se_node_acl *nacl) 225 { 226 struct se_dev_entry *deve; 227 int i; 228 229 nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, 230 sizeof(struct se_dev_entry), GFP_KERNEL); 231 if (!nacl->device_list) { 232 pr_err("Unable to allocate memory for" 233 " struct se_node_acl->device_list\n"); 234 return -ENOMEM; 235 } 236 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { 237 deve = nacl->device_list[i]; 238 239 atomic_set(&deve->ua_count, 0); 240 atomic_set(&deve->pr_ref_count, 0); 241 spin_lock_init(&deve->ua_lock); 242 INIT_LIST_HEAD(&deve->alua_port_list); 243 INIT_LIST_HEAD(&deve->ua_list); 244 } 245 246 return 0; 247 } 248 249 /* core_tpg_check_initiator_node_acl() 250 * 251 * 252 */ 253 struct se_node_acl *core_tpg_check_initiator_node_acl( 254 struct se_portal_group *tpg, 255 unsigned char *initiatorname) 256 { 257 struct se_node_acl *acl; 258 259 acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); 260 if (acl) 261 return acl; 262 263 if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) 264 return NULL; 265 266 acl = tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg); 267 if (!acl) 268 return NULL; 269 270 INIT_LIST_HEAD(&acl->acl_list); 271 INIT_LIST_HEAD(&acl->acl_sess_list); 272 kref_init(&acl->acl_kref); 273 init_completion(&acl->acl_free_comp); 274 spin_lock_init(&acl->device_list_lock); 275 spin_lock_init(&acl->nacl_sess_lock); 276 atomic_set(&acl->acl_pr_ref_count, 0); 277 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); 278 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); 279 acl->se_tpg = tpg; 280 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); 281 acl->dynamic_node_acl = 1; 282 283 tpg->se_tpg_tfo->set_default_node_attributes(acl); 284 285 if (core_create_device_list_for_node(acl) < 0) { 286 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); 287 return NULL; 288 } 289 290 if (core_set_queue_depth_for_node(tpg, acl) < 0) { 291 core_free_device_list_for_node(acl, tpg); 292 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); 293 return NULL; 294 } 295 /* 296 * Here we only create demo-mode MappedLUNs from the active 297 * TPG LUNs if the fabric is not explicitly asking for 298 * tpg_check_demo_mode_login_only() == 1. 299 */ 300 if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || 301 (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) 302 core_tpg_add_node_to_devs(acl, tpg); 303 304 spin_lock_irq(&tpg->acl_node_lock); 305 list_add_tail(&acl->acl_list, &tpg->acl_node_list); 306 tpg->num_node_acls++; 307 spin_unlock_irq(&tpg->acl_node_lock); 308 309 pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s" 310 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), 311 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, 312 tpg->se_tpg_tfo->get_fabric_name(), initiatorname); 313 314 return acl; 315 } 316 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); 317 318 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) 319 { 320 while (atomic_read(&nacl->acl_pr_ref_count) != 0) 321 cpu_relax(); 322 } 323 324 void core_tpg_clear_object_luns(struct se_portal_group *tpg) 325 { 326 int i; 327 struct se_lun *lun; 328 329 spin_lock(&tpg->tpg_lun_lock); 330 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { 331 lun = tpg->tpg_lun_list[i]; 332 333 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) || 334 (lun->lun_se_dev == NULL)) 335 continue; 336 337 spin_unlock(&tpg->tpg_lun_lock); 338 core_dev_del_lun(tpg, lun); 339 spin_lock(&tpg->tpg_lun_lock); 340 } 341 spin_unlock(&tpg->tpg_lun_lock); 342 } 343 EXPORT_SYMBOL(core_tpg_clear_object_luns); 344 345 /* core_tpg_add_initiator_node_acl(): 346 * 347 * 348 */ 349 struct se_node_acl *core_tpg_add_initiator_node_acl( 350 struct se_portal_group *tpg, 351 struct se_node_acl *se_nacl, 352 const char *initiatorname, 353 u32 queue_depth) 354 { 355 struct se_node_acl *acl = NULL; 356 357 spin_lock_irq(&tpg->acl_node_lock); 358 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); 359 if (acl) { 360 if (acl->dynamic_node_acl) { 361 acl->dynamic_node_acl = 0; 362 pr_debug("%s_TPG[%u] - Replacing dynamic ACL" 363 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 364 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); 365 spin_unlock_irq(&tpg->acl_node_lock); 366 /* 367 * Release the locally allocated struct se_node_acl 368 * because * core_tpg_add_initiator_node_acl() returned 369 * a pointer to an existing demo mode node ACL. 370 */ 371 if (se_nacl) 372 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, 373 se_nacl); 374 goto done; 375 } 376 377 pr_err("ACL entry for %s Initiator" 378 " Node %s already exists for TPG %u, ignoring" 379 " request.\n", tpg->se_tpg_tfo->get_fabric_name(), 380 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); 381 spin_unlock_irq(&tpg->acl_node_lock); 382 return ERR_PTR(-EEXIST); 383 } 384 spin_unlock_irq(&tpg->acl_node_lock); 385 386 if (!se_nacl) { 387 pr_err("struct se_node_acl pointer is NULL\n"); 388 return ERR_PTR(-EINVAL); 389 } 390 /* 391 * For v4.x logic the se_node_acl_s is hanging off a fabric 392 * dependent structure allocated via 393 * struct target_core_fabric_ops->fabric_make_nodeacl() 394 */ 395 acl = se_nacl; 396 397 INIT_LIST_HEAD(&acl->acl_list); 398 INIT_LIST_HEAD(&acl->acl_sess_list); 399 kref_init(&acl->acl_kref); 400 init_completion(&acl->acl_free_comp); 401 spin_lock_init(&acl->device_list_lock); 402 spin_lock_init(&acl->nacl_sess_lock); 403 atomic_set(&acl->acl_pr_ref_count, 0); 404 acl->queue_depth = queue_depth; 405 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); 406 acl->se_tpg = tpg; 407 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); 408 409 tpg->se_tpg_tfo->set_default_node_attributes(acl); 410 411 if (core_create_device_list_for_node(acl) < 0) { 412 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); 413 return ERR_PTR(-ENOMEM); 414 } 415 416 if (core_set_queue_depth_for_node(tpg, acl) < 0) { 417 core_free_device_list_for_node(acl, tpg); 418 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); 419 return ERR_PTR(-EINVAL); 420 } 421 422 spin_lock_irq(&tpg->acl_node_lock); 423 list_add_tail(&acl->acl_list, &tpg->acl_node_list); 424 tpg->num_node_acls++; 425 spin_unlock_irq(&tpg->acl_node_lock); 426 427 done: 428 pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s" 429 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), 430 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, 431 tpg->se_tpg_tfo->get_fabric_name(), initiatorname); 432 433 return acl; 434 } 435 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl); 436 437 /* core_tpg_del_initiator_node_acl(): 438 * 439 * 440 */ 441 int core_tpg_del_initiator_node_acl( 442 struct se_portal_group *tpg, 443 struct se_node_acl *acl, 444 int force) 445 { 446 LIST_HEAD(sess_list); 447 struct se_session *sess, *sess_tmp; 448 unsigned long flags; 449 int rc; 450 451 spin_lock_irq(&tpg->acl_node_lock); 452 if (acl->dynamic_node_acl) { 453 acl->dynamic_node_acl = 0; 454 } 455 list_del(&acl->acl_list); 456 tpg->num_node_acls--; 457 spin_unlock_irq(&tpg->acl_node_lock); 458 459 spin_lock_irqsave(&acl->nacl_sess_lock, flags); 460 acl->acl_stop = 1; 461 462 list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, 463 sess_acl_list) { 464 if (sess->sess_tearing_down != 0) 465 continue; 466 467 target_get_session(sess); 468 list_move(&sess->sess_acl_list, &sess_list); 469 } 470 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); 471 472 list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) { 473 list_del(&sess->sess_acl_list); 474 475 rc = tpg->se_tpg_tfo->shutdown_session(sess); 476 target_put_session(sess); 477 if (!rc) 478 continue; 479 target_put_session(sess); 480 } 481 target_put_nacl(acl); 482 /* 483 * Wait for last target_put_nacl() to complete in target_complete_nacl() 484 * for active fabric session transport_deregister_session() callbacks. 485 */ 486 wait_for_completion(&acl->acl_free_comp); 487 488 core_tpg_wait_for_nacl_pr_ref(acl); 489 core_clear_initiator_node_from_tpg(acl, tpg); 490 core_free_device_list_for_node(acl, tpg); 491 492 pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" 493 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), 494 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, 495 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); 496 497 return 0; 498 } 499 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl); 500 501 /* core_tpg_set_initiator_node_queue_depth(): 502 * 503 * 504 */ 505 int core_tpg_set_initiator_node_queue_depth( 506 struct se_portal_group *tpg, 507 unsigned char *initiatorname, 508 u32 queue_depth, 509 int force) 510 { 511 struct se_session *sess, *init_sess = NULL; 512 struct se_node_acl *acl; 513 unsigned long flags; 514 int dynamic_acl = 0; 515 516 spin_lock_irq(&tpg->acl_node_lock); 517 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); 518 if (!acl) { 519 pr_err("Access Control List entry for %s Initiator" 520 " Node %s does not exists for TPG %hu, ignoring" 521 " request.\n", tpg->se_tpg_tfo->get_fabric_name(), 522 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); 523 spin_unlock_irq(&tpg->acl_node_lock); 524 return -ENODEV; 525 } 526 if (acl->dynamic_node_acl) { 527 acl->dynamic_node_acl = 0; 528 dynamic_acl = 1; 529 } 530 spin_unlock_irq(&tpg->acl_node_lock); 531 532 spin_lock_irqsave(&tpg->session_lock, flags); 533 list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { 534 if (sess->se_node_acl != acl) 535 continue; 536 537 if (!force) { 538 pr_err("Unable to change queue depth for %s" 539 " Initiator Node: %s while session is" 540 " operational. To forcefully change the queue" 541 " depth and force session reinstatement" 542 " use the \"force=1\" parameter.\n", 543 tpg->se_tpg_tfo->get_fabric_name(), initiatorname); 544 spin_unlock_irqrestore(&tpg->session_lock, flags); 545 546 spin_lock_irq(&tpg->acl_node_lock); 547 if (dynamic_acl) 548 acl->dynamic_node_acl = 1; 549 spin_unlock_irq(&tpg->acl_node_lock); 550 return -EEXIST; 551 } 552 /* 553 * Determine if the session needs to be closed by our context. 554 */ 555 if (!tpg->se_tpg_tfo->shutdown_session(sess)) 556 continue; 557 558 init_sess = sess; 559 break; 560 } 561 562 /* 563 * User has requested to change the queue depth for a Initiator Node. 564 * Change the value in the Node's struct se_node_acl, and call 565 * core_set_queue_depth_for_node() to add the requested queue depth. 566 * 567 * Finally call tpg->se_tpg_tfo->close_session() to force session 568 * reinstatement to occur if there is an active session for the 569 * $FABRIC_MOD Initiator Node in question. 570 */ 571 acl->queue_depth = queue_depth; 572 573 if (core_set_queue_depth_for_node(tpg, acl) < 0) { 574 spin_unlock_irqrestore(&tpg->session_lock, flags); 575 /* 576 * Force session reinstatement if 577 * core_set_queue_depth_for_node() failed, because we assume 578 * the $FABRIC_MOD has already the set session reinstatement 579 * bit from tpg->se_tpg_tfo->shutdown_session() called above. 580 */ 581 if (init_sess) 582 tpg->se_tpg_tfo->close_session(init_sess); 583 584 spin_lock_irq(&tpg->acl_node_lock); 585 if (dynamic_acl) 586 acl->dynamic_node_acl = 1; 587 spin_unlock_irq(&tpg->acl_node_lock); 588 return -EINVAL; 589 } 590 spin_unlock_irqrestore(&tpg->session_lock, flags); 591 /* 592 * If the $FABRIC_MOD session for the Initiator Node ACL exists, 593 * forcefully shutdown the $FABRIC_MOD session/nexus. 594 */ 595 if (init_sess) 596 tpg->se_tpg_tfo->close_session(init_sess); 597 598 pr_debug("Successfully changed queue depth to: %d for Initiator" 599 " Node: %s on %s Target Portal Group: %u\n", queue_depth, 600 initiatorname, tpg->se_tpg_tfo->get_fabric_name(), 601 tpg->se_tpg_tfo->tpg_get_tag(tpg)); 602 603 spin_lock_irq(&tpg->acl_node_lock); 604 if (dynamic_acl) 605 acl->dynamic_node_acl = 1; 606 spin_unlock_irq(&tpg->acl_node_lock); 607 608 return 0; 609 } 610 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); 611 612 /* core_tpg_set_initiator_node_tag(): 613 * 614 * Initiator nodeacl tags are not used internally, but may be used by 615 * userspace to emulate aliases or groups. 616 * Returns length of newly-set tag or -EINVAL. 617 */ 618 int core_tpg_set_initiator_node_tag( 619 struct se_portal_group *tpg, 620 struct se_node_acl *acl, 621 const char *new_tag) 622 { 623 if (strlen(new_tag) >= MAX_ACL_TAG_SIZE) 624 return -EINVAL; 625 626 if (!strncmp("NULL", new_tag, 4)) { 627 acl->acl_tag[0] = '\0'; 628 return 0; 629 } 630 631 return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag); 632 } 633 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag); 634 635 static void core_tpg_lun_ref_release(struct percpu_ref *ref) 636 { 637 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); 638 639 complete(&lun->lun_ref_comp); 640 } 641 642 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg) 643 { 644 /* Set in core_dev_setup_virtual_lun0() */ 645 struct se_device *dev = g_lun0_dev; 646 struct se_lun *lun = &se_tpg->tpg_virt_lun0; 647 u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; 648 int ret; 649 650 lun->unpacked_lun = 0; 651 lun->lun_status = TRANSPORT_LUN_STATUS_FREE; 652 atomic_set(&lun->lun_acl_count, 0); 653 init_completion(&lun->lun_shutdown_comp); 654 INIT_LIST_HEAD(&lun->lun_acl_list); 655 spin_lock_init(&lun->lun_acl_lock); 656 spin_lock_init(&lun->lun_sep_lock); 657 init_completion(&lun->lun_ref_comp); 658 659 ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev); 660 if (ret < 0) 661 return ret; 662 663 return 0; 664 } 665 666 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg) 667 { 668 struct se_lun *lun = &se_tpg->tpg_virt_lun0; 669 670 core_tpg_remove_lun(se_tpg, lun); 671 } 672 673 int core_tpg_register( 674 struct target_core_fabric_ops *tfo, 675 struct se_wwn *se_wwn, 676 struct se_portal_group *se_tpg, 677 void *tpg_fabric_ptr, 678 int se_tpg_type) 679 { 680 struct se_lun *lun; 681 u32 i; 682 683 se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, 684 sizeof(struct se_lun), GFP_KERNEL); 685 if (!se_tpg->tpg_lun_list) { 686 pr_err("Unable to allocate struct se_portal_group->" 687 "tpg_lun_list\n"); 688 return -ENOMEM; 689 } 690 691 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { 692 lun = se_tpg->tpg_lun_list[i]; 693 lun->unpacked_lun = i; 694 lun->lun_link_magic = SE_LUN_LINK_MAGIC; 695 lun->lun_status = TRANSPORT_LUN_STATUS_FREE; 696 atomic_set(&lun->lun_acl_count, 0); 697 init_completion(&lun->lun_shutdown_comp); 698 INIT_LIST_HEAD(&lun->lun_acl_list); 699 spin_lock_init(&lun->lun_acl_lock); 700 spin_lock_init(&lun->lun_sep_lock); 701 init_completion(&lun->lun_ref_comp); 702 } 703 704 se_tpg->se_tpg_type = se_tpg_type; 705 se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr; 706 se_tpg->se_tpg_tfo = tfo; 707 se_tpg->se_tpg_wwn = se_wwn; 708 atomic_set(&se_tpg->tpg_pr_ref_count, 0); 709 INIT_LIST_HEAD(&se_tpg->acl_node_list); 710 INIT_LIST_HEAD(&se_tpg->se_tpg_node); 711 INIT_LIST_HEAD(&se_tpg->tpg_sess_list); 712 spin_lock_init(&se_tpg->acl_node_lock); 713 spin_lock_init(&se_tpg->session_lock); 714 spin_lock_init(&se_tpg->tpg_lun_lock); 715 716 if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) { 717 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) { 718 array_free(se_tpg->tpg_lun_list, 719 TRANSPORT_MAX_LUNS_PER_TPG); 720 return -ENOMEM; 721 } 722 } 723 724 spin_lock_bh(&tpg_lock); 725 list_add_tail(&se_tpg->se_tpg_node, &tpg_list); 726 spin_unlock_bh(&tpg_lock); 727 728 pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for" 729 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(), 730 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? 731 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ? 732 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg)); 733 734 return 0; 735 } 736 EXPORT_SYMBOL(core_tpg_register); 737 738 int core_tpg_deregister(struct se_portal_group *se_tpg) 739 { 740 struct se_node_acl *nacl, *nacl_tmp; 741 742 pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group" 743 " for endpoint: %s Portal Tag %u\n", 744 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? 745 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(), 746 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), 747 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 748 749 spin_lock_bh(&tpg_lock); 750 list_del(&se_tpg->se_tpg_node); 751 spin_unlock_bh(&tpg_lock); 752 753 while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) 754 cpu_relax(); 755 /* 756 * Release any remaining demo-mode generated se_node_acl that have 757 * not been released because of TFO->tpg_check_demo_mode_cache() == 1 758 * in transport_deregister_session(). 759 */ 760 spin_lock_irq(&se_tpg->acl_node_lock); 761 list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list, 762 acl_list) { 763 list_del(&nacl->acl_list); 764 se_tpg->num_node_acls--; 765 spin_unlock_irq(&se_tpg->acl_node_lock); 766 767 core_tpg_wait_for_nacl_pr_ref(nacl); 768 core_free_device_list_for_node(nacl, se_tpg); 769 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl); 770 771 spin_lock_irq(&se_tpg->acl_node_lock); 772 } 773 spin_unlock_irq(&se_tpg->acl_node_lock); 774 775 if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) 776 core_tpg_release_virtual_lun0(se_tpg); 777 778 se_tpg->se_tpg_fabric_ptr = NULL; 779 array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG); 780 return 0; 781 } 782 EXPORT_SYMBOL(core_tpg_deregister); 783 784 struct se_lun *core_tpg_alloc_lun( 785 struct se_portal_group *tpg, 786 u32 unpacked_lun) 787 { 788 struct se_lun *lun; 789 790 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { 791 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" 792 "-1: %u for Target Portal Group: %u\n", 793 tpg->se_tpg_tfo->get_fabric_name(), 794 unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1, 795 tpg->se_tpg_tfo->tpg_get_tag(tpg)); 796 return ERR_PTR(-EOVERFLOW); 797 } 798 799 spin_lock(&tpg->tpg_lun_lock); 800 lun = tpg->tpg_lun_list[unpacked_lun]; 801 if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) { 802 pr_err("TPG Logical Unit Number: %u is already active" 803 " on %s Target Portal Group: %u, ignoring request.\n", 804 unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(), 805 tpg->se_tpg_tfo->tpg_get_tag(tpg)); 806 spin_unlock(&tpg->tpg_lun_lock); 807 return ERR_PTR(-EINVAL); 808 } 809 spin_unlock(&tpg->tpg_lun_lock); 810 811 return lun; 812 } 813 814 int core_tpg_add_lun( 815 struct se_portal_group *tpg, 816 struct se_lun *lun, 817 u32 lun_access, 818 struct se_device *dev) 819 { 820 int ret; 821 822 ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release); 823 if (ret < 0) 824 return ret; 825 826 ret = core_dev_export(dev, tpg, lun); 827 if (ret < 0) { 828 percpu_ref_exit(&lun->lun_ref); 829 return ret; 830 } 831 832 spin_lock(&tpg->tpg_lun_lock); 833 lun->lun_access = lun_access; 834 lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE; 835 spin_unlock(&tpg->tpg_lun_lock); 836 837 return 0; 838 } 839 840 void core_tpg_remove_lun( 841 struct se_portal_group *tpg, 842 struct se_lun *lun) 843 { 844 core_clear_lun_from_tpg(lun, tpg); 845 transport_clear_lun_ref(lun); 846 847 core_dev_unexport(lun->lun_se_dev, tpg, lun); 848 849 spin_lock(&tpg->tpg_lun_lock); 850 lun->lun_status = TRANSPORT_LUN_STATUS_FREE; 851 spin_unlock(&tpg->tpg_lun_lock); 852 853 percpu_ref_exit(&lun->lun_ref); 854 } 855