1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_device.c (based on iscsi_target_device.c) 4 * 5 * This file contains the TCM Virtual Device and Disk Transport 6 * agnostic related functions. 7 * 8 * (c) Copyright 2003-2013 Datera, Inc. 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 ******************************************************************************/ 13 14 #include <linux/net.h> 15 #include <linux/string.h> 16 #include <linux/delay.h> 17 #include <linux/timer.h> 18 #include <linux/slab.h> 19 #include <linux/spinlock.h> 20 #include <linux/kthread.h> 21 #include <linux/in.h> 22 #include <linux/export.h> 23 #include <linux/t10-pi.h> 24 #include <asm/unaligned.h> 25 #include <net/sock.h> 26 #include <net/tcp.h> 27 #include <scsi/scsi_common.h> 28 #include <scsi/scsi_proto.h> 29 30 #include <target/target_core_base.h> 31 #include <target/target_core_backend.h> 32 #include <target/target_core_fabric.h> 33 34 #include "target_core_internal.h" 35 #include "target_core_alua.h" 36 #include "target_core_pr.h" 37 #include "target_core_ua.h" 38 39 static DEFINE_MUTEX(device_mutex); 40 static LIST_HEAD(device_list); 41 static DEFINE_IDR(devices_idr); 42 43 static struct se_hba *lun0_hba; 44 /* not static, needed by tpg.c */ 45 struct se_device *g_lun0_dev; 46 47 sense_reason_t 48 transport_lookup_cmd_lun(struct se_cmd *se_cmd) 49 { 50 struct se_lun *se_lun = NULL; 51 struct se_session *se_sess = se_cmd->se_sess; 52 struct se_node_acl *nacl = se_sess->se_node_acl; 53 struct se_dev_entry *deve; 54 sense_reason_t ret = TCM_NO_SENSE; 55 56 rcu_read_lock(); 57 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); 58 if (deve) { 59 atomic_long_inc(&deve->total_cmds); 60 61 if (se_cmd->data_direction == DMA_TO_DEVICE) 62 atomic_long_add(se_cmd->data_length, 63 &deve->write_bytes); 64 else if (se_cmd->data_direction == DMA_FROM_DEVICE) 65 atomic_long_add(se_cmd->data_length, 66 &deve->read_bytes); 67 68 if ((se_cmd->data_direction == DMA_TO_DEVICE) && 69 deve->lun_access_ro) { 70 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN" 71 " Access for 0x%08llx\n", 72 se_cmd->se_tfo->fabric_name, 73 se_cmd->orig_fe_lun); 74 rcu_read_unlock(); 75 return TCM_WRITE_PROTECTED; 76 } 77 78 se_lun = deve->se_lun; 79 80 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { 81 se_lun = NULL; 82 goto out_unlock; 83 } 84 85 se_cmd->se_lun = se_lun; 86 se_cmd->pr_res_key = deve->pr_res_key; 87 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 88 se_cmd->lun_ref_active = true; 89 } 90 out_unlock: 91 rcu_read_unlock(); 92 93 if (!se_lun) { 94 /* 95 * Use the se_portal_group->tpg_virt_lun0 to allow for 96 * REPORT_LUNS, et al to be returned when no active 97 * MappedLUN=0 exists for this Initiator Port. 98 */ 99 if (se_cmd->orig_fe_lun != 0) { 100 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" 101 " Access for 0x%08llx from %s\n", 102 se_cmd->se_tfo->fabric_name, 103 se_cmd->orig_fe_lun, 104 nacl->initiatorname); 105 return TCM_NON_EXISTENT_LUN; 106 } 107 108 /* 109 * Force WRITE PROTECT for virtual LUN 0 110 */ 111 if ((se_cmd->data_direction != DMA_FROM_DEVICE) && 112 (se_cmd->data_direction != DMA_NONE)) 113 return TCM_WRITE_PROTECTED; 114 115 se_lun = se_sess->se_tpg->tpg_virt_lun0; 116 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) 117 return TCM_NON_EXISTENT_LUN; 118 119 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0; 120 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 121 se_cmd->lun_ref_active = true; 122 } 123 /* 124 * RCU reference protected by percpu se_lun->lun_ref taken above that 125 * must drop to zero (including initial reference) before this se_lun 126 * pointer can be kfree_rcu() by the final se_lun->lun_group put via 127 * target_core_fabric_configfs.c:target_fabric_port_release 128 */ 129 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); 130 atomic_long_inc(&se_cmd->se_dev->num_cmds); 131 132 if (se_cmd->data_direction == DMA_TO_DEVICE) 133 atomic_long_add(se_cmd->data_length, 134 &se_cmd->se_dev->write_bytes); 135 else if (se_cmd->data_direction == DMA_FROM_DEVICE) 136 atomic_long_add(se_cmd->data_length, 137 &se_cmd->se_dev->read_bytes); 138 139 return ret; 140 } 141 EXPORT_SYMBOL(transport_lookup_cmd_lun); 142 143 int transport_lookup_tmr_lun(struct se_cmd *se_cmd) 144 { 145 struct se_dev_entry *deve; 146 struct se_lun *se_lun = NULL; 147 struct se_session *se_sess = se_cmd->se_sess; 148 struct se_node_acl *nacl = se_sess->se_node_acl; 149 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 150 unsigned long flags; 151 152 rcu_read_lock(); 153 deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); 154 if (deve) { 155 se_lun = deve->se_lun; 156 157 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { 158 se_lun = NULL; 159 goto out_unlock; 160 } 161 162 se_cmd->se_lun = se_lun; 163 se_cmd->pr_res_key = deve->pr_res_key; 164 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 165 se_cmd->lun_ref_active = true; 166 } 167 out_unlock: 168 rcu_read_unlock(); 169 170 if (!se_lun) { 171 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" 172 " Access for 0x%08llx for %s\n", 173 se_cmd->se_tfo->fabric_name, 174 se_cmd->orig_fe_lun, 175 nacl->initiatorname); 176 return -ENODEV; 177 } 178 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); 179 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev); 180 181 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags); 182 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list); 183 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags); 184 185 return 0; 186 } 187 EXPORT_SYMBOL(transport_lookup_tmr_lun); 188 189 bool target_lun_is_rdonly(struct se_cmd *cmd) 190 { 191 struct se_session *se_sess = cmd->se_sess; 192 struct se_dev_entry *deve; 193 bool ret; 194 195 rcu_read_lock(); 196 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun); 197 ret = deve && deve->lun_access_ro; 198 rcu_read_unlock(); 199 200 return ret; 201 } 202 EXPORT_SYMBOL(target_lun_is_rdonly); 203 204 /* 205 * This function is called from core_scsi3_emulate_pro_register_and_move() 206 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref 207 * when a matching rtpi is found. 208 */ 209 struct se_dev_entry *core_get_se_deve_from_rtpi( 210 struct se_node_acl *nacl, 211 u16 rtpi) 212 { 213 struct se_dev_entry *deve; 214 struct se_lun *lun; 215 struct se_portal_group *tpg = nacl->se_tpg; 216 217 rcu_read_lock(); 218 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 219 lun = deve->se_lun; 220 if (!lun) { 221 pr_err("%s device entries device pointer is" 222 " NULL, but Initiator has access.\n", 223 tpg->se_tpg_tfo->fabric_name); 224 continue; 225 } 226 if (lun->lun_rtpi != rtpi) 227 continue; 228 229 kref_get(&deve->pr_kref); 230 rcu_read_unlock(); 231 232 return deve; 233 } 234 rcu_read_unlock(); 235 236 return NULL; 237 } 238 239 void core_free_device_list_for_node( 240 struct se_node_acl *nacl, 241 struct se_portal_group *tpg) 242 { 243 struct se_dev_entry *deve; 244 245 mutex_lock(&nacl->lun_entry_mutex); 246 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) 247 core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg); 248 mutex_unlock(&nacl->lun_entry_mutex); 249 } 250 251 void core_update_device_list_access( 252 u64 mapped_lun, 253 bool lun_access_ro, 254 struct se_node_acl *nacl) 255 { 256 struct se_dev_entry *deve; 257 258 mutex_lock(&nacl->lun_entry_mutex); 259 deve = target_nacl_find_deve(nacl, mapped_lun); 260 if (deve) 261 deve->lun_access_ro = lun_access_ro; 262 mutex_unlock(&nacl->lun_entry_mutex); 263 } 264 265 /* 266 * Called with rcu_read_lock or nacl->device_list_lock held. 267 */ 268 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun) 269 { 270 struct se_dev_entry *deve; 271 272 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) 273 if (deve->mapped_lun == mapped_lun) 274 return deve; 275 276 return NULL; 277 } 278 EXPORT_SYMBOL(target_nacl_find_deve); 279 280 void target_pr_kref_release(struct kref *kref) 281 { 282 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry, 283 pr_kref); 284 complete(&deve->pr_comp); 285 } 286 287 static void 288 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new, 289 bool skip_new) 290 { 291 struct se_dev_entry *tmp; 292 293 rcu_read_lock(); 294 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) { 295 if (skip_new && tmp == new) 296 continue; 297 core_scsi3_ua_allocate(tmp, 0x3F, 298 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED); 299 } 300 rcu_read_unlock(); 301 } 302 303 int core_enable_device_list_for_node( 304 struct se_lun *lun, 305 struct se_lun_acl *lun_acl, 306 u64 mapped_lun, 307 bool lun_access_ro, 308 struct se_node_acl *nacl, 309 struct se_portal_group *tpg) 310 { 311 struct se_dev_entry *orig, *new; 312 313 new = kzalloc(sizeof(*new), GFP_KERNEL); 314 if (!new) { 315 pr_err("Unable to allocate se_dev_entry memory\n"); 316 return -ENOMEM; 317 } 318 319 spin_lock_init(&new->ua_lock); 320 INIT_LIST_HEAD(&new->ua_list); 321 INIT_LIST_HEAD(&new->lun_link); 322 323 new->mapped_lun = mapped_lun; 324 kref_init(&new->pr_kref); 325 init_completion(&new->pr_comp); 326 327 new->lun_access_ro = lun_access_ro; 328 new->creation_time = get_jiffies_64(); 329 new->attach_count++; 330 331 mutex_lock(&nacl->lun_entry_mutex); 332 orig = target_nacl_find_deve(nacl, mapped_lun); 333 if (orig && orig->se_lun) { 334 struct se_lun *orig_lun = orig->se_lun; 335 336 if (orig_lun != lun) { 337 pr_err("Existing orig->se_lun doesn't match new lun" 338 " for dynamic -> explicit NodeACL conversion:" 339 " %s\n", nacl->initiatorname); 340 mutex_unlock(&nacl->lun_entry_mutex); 341 kfree(new); 342 return -EINVAL; 343 } 344 if (orig->se_lun_acl != NULL) { 345 pr_warn_ratelimited("Detected existing explicit" 346 " se_lun_acl->se_lun_group reference for %s" 347 " mapped_lun: %llu, failing\n", 348 nacl->initiatorname, mapped_lun); 349 mutex_unlock(&nacl->lun_entry_mutex); 350 kfree(new); 351 return -EINVAL; 352 } 353 354 new->se_lun = lun; 355 new->se_lun_acl = lun_acl; 356 hlist_del_rcu(&orig->link); 357 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 358 mutex_unlock(&nacl->lun_entry_mutex); 359 360 spin_lock(&lun->lun_deve_lock); 361 list_del(&orig->lun_link); 362 list_add_tail(&new->lun_link, &lun->lun_deve_list); 363 spin_unlock(&lun->lun_deve_lock); 364 365 kref_put(&orig->pr_kref, target_pr_kref_release); 366 wait_for_completion(&orig->pr_comp); 367 368 target_luns_data_has_changed(nacl, new, true); 369 kfree_rcu(orig, rcu_head); 370 return 0; 371 } 372 373 new->se_lun = lun; 374 new->se_lun_acl = lun_acl; 375 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 376 mutex_unlock(&nacl->lun_entry_mutex); 377 378 spin_lock(&lun->lun_deve_lock); 379 list_add_tail(&new->lun_link, &lun->lun_deve_list); 380 spin_unlock(&lun->lun_deve_lock); 381 382 target_luns_data_has_changed(nacl, new, true); 383 return 0; 384 } 385 386 void core_disable_device_list_for_node( 387 struct se_lun *lun, 388 struct se_dev_entry *orig, 389 struct se_node_acl *nacl, 390 struct se_portal_group *tpg) 391 { 392 /* 393 * rcu_dereference_raw protected by se_lun->lun_group symlink 394 * reference to se_device->dev_group. 395 */ 396 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 397 398 lockdep_assert_held(&nacl->lun_entry_mutex); 399 400 /* 401 * If the MappedLUN entry is being disabled, the entry in 402 * lun->lun_deve_list must be removed now before clearing the 403 * struct se_dev_entry pointers below as logic in 404 * core_alua_do_transition_tg_pt() depends on these being present. 405 * 406 * deve->se_lun_acl will be NULL for demo-mode created LUNs 407 * that have not been explicitly converted to MappedLUNs -> 408 * struct se_lun_acl, but we remove deve->lun_link from 409 * lun->lun_deve_list. This also means that active UAs and 410 * NodeACL context specific PR metadata for demo-mode 411 * MappedLUN *deve will be released below.. 412 */ 413 spin_lock(&lun->lun_deve_lock); 414 list_del(&orig->lun_link); 415 spin_unlock(&lun->lun_deve_lock); 416 /* 417 * Disable struct se_dev_entry LUN ACL mapping 418 */ 419 core_scsi3_ua_release_all(orig); 420 421 hlist_del_rcu(&orig->link); 422 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); 423 orig->lun_access_ro = false; 424 orig->creation_time = 0; 425 orig->attach_count--; 426 /* 427 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1 428 * or REGISTER_AND_MOVE PR operation to complete. 429 */ 430 kref_put(&orig->pr_kref, target_pr_kref_release); 431 wait_for_completion(&orig->pr_comp); 432 433 kfree_rcu(orig, rcu_head); 434 435 core_scsi3_free_pr_reg_from_nacl(dev, nacl); 436 target_luns_data_has_changed(nacl, NULL, false); 437 } 438 439 /* core_clear_lun_from_tpg(): 440 * 441 * 442 */ 443 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) 444 { 445 struct se_node_acl *nacl; 446 struct se_dev_entry *deve; 447 448 mutex_lock(&tpg->acl_node_mutex); 449 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) { 450 451 mutex_lock(&nacl->lun_entry_mutex); 452 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 453 if (lun != deve->se_lun) 454 continue; 455 456 core_disable_device_list_for_node(lun, deve, nacl, tpg); 457 } 458 mutex_unlock(&nacl->lun_entry_mutex); 459 } 460 mutex_unlock(&tpg->acl_node_mutex); 461 } 462 463 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev) 464 { 465 struct se_lun *tmp; 466 467 spin_lock(&dev->se_port_lock); 468 if (dev->export_count == 0x0000ffff) { 469 pr_warn("Reached dev->dev_port_count ==" 470 " 0x0000ffff\n"); 471 spin_unlock(&dev->se_port_lock); 472 return -ENOSPC; 473 } 474 again: 475 /* 476 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device 477 * Here is the table from spc4r17 section 7.7.3.8. 478 * 479 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field 480 * 481 * Code Description 482 * 0h Reserved 483 * 1h Relative port 1, historically known as port A 484 * 2h Relative port 2, historically known as port B 485 * 3h to FFFFh Relative port 3 through 65 535 486 */ 487 lun->lun_rtpi = dev->dev_rpti_counter++; 488 if (!lun->lun_rtpi) 489 goto again; 490 491 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) { 492 /* 493 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique 494 * for 16-bit wrap.. 495 */ 496 if (lun->lun_rtpi == tmp->lun_rtpi) 497 goto again; 498 } 499 spin_unlock(&dev->se_port_lock); 500 501 return 0; 502 } 503 504 static void se_release_vpd_for_dev(struct se_device *dev) 505 { 506 struct t10_vpd *vpd, *vpd_tmp; 507 508 spin_lock(&dev->t10_wwn.t10_vpd_lock); 509 list_for_each_entry_safe(vpd, vpd_tmp, 510 &dev->t10_wwn.t10_vpd_list, vpd_list) { 511 list_del(&vpd->vpd_list); 512 kfree(vpd); 513 } 514 spin_unlock(&dev->t10_wwn.t10_vpd_lock); 515 } 516 517 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size) 518 { 519 u32 aligned_max_sectors; 520 u32 alignment; 521 /* 522 * Limit max_sectors to a PAGE_SIZE aligned value for modern 523 * transport_allocate_data_tasks() operation. 524 */ 525 alignment = max(1ul, PAGE_SIZE / block_size); 526 aligned_max_sectors = rounddown(max_sectors, alignment); 527 528 if (max_sectors != aligned_max_sectors) 529 pr_info("Rounding down aligned max_sectors from %u to %u\n", 530 max_sectors, aligned_max_sectors); 531 532 return aligned_max_sectors; 533 } 534 535 int core_dev_add_lun( 536 struct se_portal_group *tpg, 537 struct se_device *dev, 538 struct se_lun *lun) 539 { 540 int rc; 541 542 rc = core_tpg_add_lun(tpg, lun, false, dev); 543 if (rc < 0) 544 return rc; 545 546 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from" 547 " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name, 548 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 549 tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id); 550 /* 551 * Update LUN maps for dynamically added initiators when 552 * generate_node_acl is enabled. 553 */ 554 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) { 555 struct se_node_acl *acl; 556 557 mutex_lock(&tpg->acl_node_mutex); 558 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 559 if (acl->dynamic_node_acl && 560 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only || 561 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) { 562 core_tpg_add_node_to_devs(acl, tpg, lun); 563 } 564 } 565 mutex_unlock(&tpg->acl_node_mutex); 566 } 567 568 return 0; 569 } 570 571 /* core_dev_del_lun(): 572 * 573 * 574 */ 575 void core_dev_del_lun( 576 struct se_portal_group *tpg, 577 struct se_lun *lun) 578 { 579 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from" 580 " device object\n", tpg->se_tpg_tfo->fabric_name, 581 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 582 tpg->se_tpg_tfo->fabric_name); 583 584 core_tpg_remove_lun(tpg, lun); 585 } 586 587 struct se_lun_acl *core_dev_init_initiator_node_lun_acl( 588 struct se_portal_group *tpg, 589 struct se_node_acl *nacl, 590 u64 mapped_lun, 591 int *ret) 592 { 593 struct se_lun_acl *lacl; 594 595 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) { 596 pr_err("%s InitiatorName exceeds maximum size.\n", 597 tpg->se_tpg_tfo->fabric_name); 598 *ret = -EOVERFLOW; 599 return NULL; 600 } 601 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL); 602 if (!lacl) { 603 pr_err("Unable to allocate memory for struct se_lun_acl.\n"); 604 *ret = -ENOMEM; 605 return NULL; 606 } 607 608 lacl->mapped_lun = mapped_lun; 609 lacl->se_lun_nacl = nacl; 610 611 return lacl; 612 } 613 614 int core_dev_add_initiator_node_lun_acl( 615 struct se_portal_group *tpg, 616 struct se_lun_acl *lacl, 617 struct se_lun *lun, 618 bool lun_access_ro) 619 { 620 struct se_node_acl *nacl = lacl->se_lun_nacl; 621 /* 622 * rcu_dereference_raw protected by se_lun->lun_group symlink 623 * reference to se_device->dev_group. 624 */ 625 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 626 627 if (!nacl) 628 return -EINVAL; 629 630 if (lun->lun_access_ro) 631 lun_access_ro = true; 632 633 lacl->se_lun = lun; 634 635 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun, 636 lun_access_ro, nacl, tpg) < 0) 637 return -EINVAL; 638 639 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for " 640 " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name, 641 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun, 642 lun_access_ro ? "RO" : "RW", 643 nacl->initiatorname); 644 /* 645 * Check to see if there are any existing persistent reservation APTPL 646 * pre-registrations that need to be enabled for this LUN ACL.. 647 */ 648 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl, 649 lacl->mapped_lun); 650 return 0; 651 } 652 653 int core_dev_del_initiator_node_lun_acl( 654 struct se_lun *lun, 655 struct se_lun_acl *lacl) 656 { 657 struct se_portal_group *tpg = lun->lun_tpg; 658 struct se_node_acl *nacl; 659 struct se_dev_entry *deve; 660 661 nacl = lacl->se_lun_nacl; 662 if (!nacl) 663 return -EINVAL; 664 665 mutex_lock(&nacl->lun_entry_mutex); 666 deve = target_nacl_find_deve(nacl, lacl->mapped_lun); 667 if (deve) 668 core_disable_device_list_for_node(lun, deve, nacl, tpg); 669 mutex_unlock(&nacl->lun_entry_mutex); 670 671 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for" 672 " InitiatorNode: %s Mapped LUN: %llu\n", 673 tpg->se_tpg_tfo->fabric_name, 674 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 675 nacl->initiatorname, lacl->mapped_lun); 676 677 return 0; 678 } 679 680 void core_dev_free_initiator_node_lun_acl( 681 struct se_portal_group *tpg, 682 struct se_lun_acl *lacl) 683 { 684 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s" 685 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name, 686 tpg->se_tpg_tfo->tpg_get_tag(tpg), 687 tpg->se_tpg_tfo->fabric_name, 688 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun); 689 690 kfree(lacl); 691 } 692 693 static void scsi_dump_inquiry(struct se_device *dev) 694 { 695 struct t10_wwn *wwn = &dev->t10_wwn; 696 int device_type = dev->transport->get_device_type(dev); 697 698 /* 699 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer 700 */ 701 pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n", 702 wwn->vendor); 703 pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n", 704 wwn->model); 705 pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n", 706 wwn->revision); 707 pr_debug(" Type: %s ", scsi_device_type(device_type)); 708 } 709 710 struct se_device *target_alloc_device(struct se_hba *hba, const char *name) 711 { 712 struct se_device *dev; 713 struct se_lun *xcopy_lun; 714 int i; 715 716 dev = hba->backend->ops->alloc_device(hba, name); 717 if (!dev) 718 return NULL; 719 720 dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL); 721 if (!dev->queues) { 722 dev->transport->free_device(dev); 723 return NULL; 724 } 725 726 dev->queue_cnt = nr_cpu_ids; 727 for (i = 0; i < dev->queue_cnt; i++) { 728 struct se_device_queue *q; 729 730 q = &dev->queues[i]; 731 INIT_LIST_HEAD(&q->state_list); 732 spin_lock_init(&q->lock); 733 734 init_llist_head(&q->sq.cmd_list); 735 INIT_WORK(&q->sq.work, target_queued_submit_work); 736 } 737 738 dev->se_hba = hba; 739 dev->transport = hba->backend->ops; 740 dev->transport_flags = dev->transport->transport_flags_default; 741 dev->prot_length = sizeof(struct t10_pi_tuple); 742 dev->hba_index = hba->hba_index; 743 744 INIT_LIST_HEAD(&dev->dev_sep_list); 745 INIT_LIST_HEAD(&dev->dev_tmr_list); 746 INIT_LIST_HEAD(&dev->delayed_cmd_list); 747 INIT_LIST_HEAD(&dev->qf_cmd_list); 748 spin_lock_init(&dev->delayed_cmd_lock); 749 spin_lock_init(&dev->dev_reservation_lock); 750 spin_lock_init(&dev->se_port_lock); 751 spin_lock_init(&dev->se_tmr_lock); 752 spin_lock_init(&dev->qf_cmd_lock); 753 sema_init(&dev->caw_sem, 1); 754 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list); 755 spin_lock_init(&dev->t10_wwn.t10_vpd_lock); 756 INIT_LIST_HEAD(&dev->t10_pr.registration_list); 757 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list); 758 spin_lock_init(&dev->t10_pr.registration_lock); 759 spin_lock_init(&dev->t10_pr.aptpl_reg_lock); 760 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list); 761 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock); 762 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list); 763 spin_lock_init(&dev->t10_alua.lba_map_lock); 764 765 INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work); 766 767 dev->t10_wwn.t10_dev = dev; 768 /* 769 * Use OpenFabrics IEEE Company ID: 00 14 05 770 */ 771 dev->t10_wwn.company_id = 0x001405; 772 773 dev->t10_alua.t10_dev = dev; 774 775 dev->dev_attrib.da_dev = dev; 776 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS; 777 dev->dev_attrib.emulate_dpo = 1; 778 dev->dev_attrib.emulate_fua_write = 1; 779 dev->dev_attrib.emulate_fua_read = 1; 780 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE; 781 dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR; 782 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS; 783 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU; 784 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS; 785 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW; 786 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC; 787 dev->dev_attrib.emulate_pr = DA_EMULATE_PR; 788 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT; 789 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS; 790 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL; 791 dev->dev_attrib.is_nonrot = DA_IS_NONROT; 792 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD; 793 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT; 794 dev->dev_attrib.max_unmap_block_desc_count = 795 DA_MAX_UNMAP_BLOCK_DESC_COUNT; 796 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT; 797 dev->dev_attrib.unmap_granularity_alignment = 798 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT; 799 dev->dev_attrib.unmap_zeroes_data = 800 DA_UNMAP_ZEROES_DATA_DEFAULT; 801 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN; 802 803 xcopy_lun = &dev->xcopy_lun; 804 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev); 805 init_completion(&xcopy_lun->lun_shutdown_comp); 806 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list); 807 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link); 808 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex); 809 xcopy_lun->lun_tpg = &xcopy_pt_tpg; 810 811 /* Preload the default INQUIRY const values */ 812 strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor)); 813 strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod, 814 sizeof(dev->t10_wwn.model)); 815 strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev, 816 sizeof(dev->t10_wwn.revision)); 817 818 return dev; 819 } 820 821 /* 822 * Check if the underlying struct block_device supports discard and if yes 823 * configure the UNMAP parameters. 824 */ 825 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, 826 struct block_device *bdev) 827 { 828 int block_size = bdev_logical_block_size(bdev); 829 830 if (!bdev_max_discard_sectors(bdev)) 831 return false; 832 833 attrib->max_unmap_lba_count = 834 bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9); 835 /* 836 * Currently hardcoded to 1 in Linux/SCSI code.. 837 */ 838 attrib->max_unmap_block_desc_count = 1; 839 attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size; 840 attrib->unmap_granularity_alignment = 841 bdev_discard_alignment(bdev) / block_size; 842 return true; 843 } 844 EXPORT_SYMBOL(target_configure_unmap_from_queue); 845 846 /* 847 * Convert from blocksize advertised to the initiator to the 512 byte 848 * units unconditionally used by the Linux block layer. 849 */ 850 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb) 851 { 852 switch (dev->dev_attrib.block_size) { 853 case 4096: 854 return lb << 3; 855 case 2048: 856 return lb << 2; 857 case 1024: 858 return lb << 1; 859 default: 860 return lb; 861 } 862 } 863 EXPORT_SYMBOL(target_to_linux_sector); 864 865 struct devices_idr_iter { 866 struct config_item *prev_item; 867 int (*fn)(struct se_device *dev, void *data); 868 void *data; 869 }; 870 871 static int target_devices_idr_iter(int id, void *p, void *data) 872 __must_hold(&device_mutex) 873 { 874 struct devices_idr_iter *iter = data; 875 struct se_device *dev = p; 876 int ret; 877 878 config_item_put(iter->prev_item); 879 iter->prev_item = NULL; 880 881 /* 882 * We add the device early to the idr, so it can be used 883 * by backend modules during configuration. We do not want 884 * to allow other callers to access partially setup devices, 885 * so we skip them here. 886 */ 887 if (!target_dev_configured(dev)) 888 return 0; 889 890 iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item); 891 if (!iter->prev_item) 892 return 0; 893 mutex_unlock(&device_mutex); 894 895 ret = iter->fn(dev, iter->data); 896 897 mutex_lock(&device_mutex); 898 return ret; 899 } 900 901 /** 902 * target_for_each_device - iterate over configured devices 903 * @fn: iterator function 904 * @data: pointer to data that will be passed to fn 905 * 906 * fn must return 0 to continue looping over devices. non-zero will break 907 * from the loop and return that value to the caller. 908 */ 909 int target_for_each_device(int (*fn)(struct se_device *dev, void *data), 910 void *data) 911 { 912 struct devices_idr_iter iter = { .fn = fn, .data = data }; 913 int ret; 914 915 mutex_lock(&device_mutex); 916 ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter); 917 mutex_unlock(&device_mutex); 918 config_item_put(iter.prev_item); 919 return ret; 920 } 921 922 int target_configure_device(struct se_device *dev) 923 { 924 struct se_hba *hba = dev->se_hba; 925 int ret, id; 926 927 if (target_dev_configured(dev)) { 928 pr_err("se_dev->se_dev_ptr already set for storage" 929 " object\n"); 930 return -EEXIST; 931 } 932 933 /* 934 * Add early so modules like tcmu can use during its 935 * configuration. 936 */ 937 mutex_lock(&device_mutex); 938 /* 939 * Use cyclic to try and avoid collisions with devices 940 * that were recently removed. 941 */ 942 id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL); 943 mutex_unlock(&device_mutex); 944 if (id < 0) { 945 ret = -ENOMEM; 946 goto out; 947 } 948 dev->dev_index = id; 949 950 ret = dev->transport->configure_device(dev); 951 if (ret) 952 goto out_free_index; 953 954 if (dev->transport->configure_unmap && 955 dev->transport->configure_unmap(dev)) { 956 pr_debug("Discard support available, but disabled by default.\n"); 957 } 958 959 /* 960 * XXX: there is not much point to have two different values here.. 961 */ 962 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size; 963 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth; 964 965 /* 966 * Align max_hw_sectors down to PAGE_SIZE I/O transfers 967 */ 968 dev->dev_attrib.hw_max_sectors = 969 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors, 970 dev->dev_attrib.hw_block_size); 971 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors; 972 973 dev->creation_time = get_jiffies_64(); 974 975 ret = core_setup_alua(dev); 976 if (ret) 977 goto out_destroy_device; 978 979 /* 980 * Setup work_queue for QUEUE_FULL 981 */ 982 INIT_WORK(&dev->qf_work_queue, target_qf_do_work); 983 984 scsi_dump_inquiry(dev); 985 986 spin_lock(&hba->device_lock); 987 hba->dev_count++; 988 spin_unlock(&hba->device_lock); 989 990 dev->dev_flags |= DF_CONFIGURED; 991 992 return 0; 993 994 out_destroy_device: 995 dev->transport->destroy_device(dev); 996 out_free_index: 997 mutex_lock(&device_mutex); 998 idr_remove(&devices_idr, dev->dev_index); 999 mutex_unlock(&device_mutex); 1000 out: 1001 se_release_vpd_for_dev(dev); 1002 return ret; 1003 } 1004 1005 void target_free_device(struct se_device *dev) 1006 { 1007 struct se_hba *hba = dev->se_hba; 1008 1009 WARN_ON(!list_empty(&dev->dev_sep_list)); 1010 1011 if (target_dev_configured(dev)) { 1012 dev->transport->destroy_device(dev); 1013 1014 mutex_lock(&device_mutex); 1015 idr_remove(&devices_idr, dev->dev_index); 1016 mutex_unlock(&device_mutex); 1017 1018 spin_lock(&hba->device_lock); 1019 hba->dev_count--; 1020 spin_unlock(&hba->device_lock); 1021 } 1022 1023 core_alua_free_lu_gp_mem(dev); 1024 core_alua_set_lba_map(dev, NULL, 0, 0); 1025 core_scsi3_free_all_registrations(dev); 1026 se_release_vpd_for_dev(dev); 1027 1028 if (dev->transport->free_prot) 1029 dev->transport->free_prot(dev); 1030 1031 kfree(dev->queues); 1032 dev->transport->free_device(dev); 1033 } 1034 1035 int core_dev_setup_virtual_lun0(void) 1036 { 1037 struct se_hba *hba; 1038 struct se_device *dev; 1039 char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1"; 1040 int ret; 1041 1042 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE); 1043 if (IS_ERR(hba)) 1044 return PTR_ERR(hba); 1045 1046 dev = target_alloc_device(hba, "virt_lun0"); 1047 if (!dev) { 1048 ret = -ENOMEM; 1049 goto out_free_hba; 1050 } 1051 1052 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf)); 1053 1054 ret = target_configure_device(dev); 1055 if (ret) 1056 goto out_free_se_dev; 1057 1058 lun0_hba = hba; 1059 g_lun0_dev = dev; 1060 return 0; 1061 1062 out_free_se_dev: 1063 target_free_device(dev); 1064 out_free_hba: 1065 core_delete_hba(hba); 1066 return ret; 1067 } 1068 1069 1070 void core_dev_release_virtual_lun0(void) 1071 { 1072 struct se_hba *hba = lun0_hba; 1073 1074 if (!hba) 1075 return; 1076 1077 if (g_lun0_dev) 1078 target_free_device(g_lun0_dev); 1079 core_delete_hba(hba); 1080 } 1081 1082 /* 1083 * Common CDB parsing for kernel and user passthrough. 1084 */ 1085 sense_reason_t 1086 passthrough_parse_cdb(struct se_cmd *cmd, 1087 sense_reason_t (*exec_cmd)(struct se_cmd *cmd)) 1088 { 1089 unsigned char *cdb = cmd->t_task_cdb; 1090 struct se_device *dev = cmd->se_dev; 1091 unsigned int size; 1092 1093 /* 1094 * For REPORT LUNS we always need to emulate the response, for everything 1095 * else, pass it up. 1096 */ 1097 if (cdb[0] == REPORT_LUNS) { 1098 cmd->execute_cmd = spc_emulate_report_luns; 1099 return TCM_NO_SENSE; 1100 } 1101 1102 /* 1103 * With emulate_pr disabled, all reservation requests should fail, 1104 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set. 1105 */ 1106 if (!dev->dev_attrib.emulate_pr && 1107 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1108 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1109 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1110 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1111 return TCM_UNSUPPORTED_SCSI_OPCODE; 1112 } 1113 1114 /* 1115 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to 1116 * emulate the response, since tcmu does not have the information 1117 * required to process these commands. 1118 */ 1119 if (!(dev->transport_flags & 1120 TRANSPORT_FLAG_PASSTHROUGH_PGR)) { 1121 if (cdb[0] == PERSISTENT_RESERVE_IN) { 1122 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1123 size = get_unaligned_be16(&cdb[7]); 1124 return target_cmd_size_check(cmd, size); 1125 } 1126 if (cdb[0] == PERSISTENT_RESERVE_OUT) { 1127 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1128 size = get_unaligned_be32(&cdb[5]); 1129 return target_cmd_size_check(cmd, size); 1130 } 1131 1132 if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) { 1133 cmd->execute_cmd = target_scsi2_reservation_release; 1134 if (cdb[0] == RELEASE_10) 1135 size = get_unaligned_be16(&cdb[7]); 1136 else 1137 size = cmd->data_length; 1138 return target_cmd_size_check(cmd, size); 1139 } 1140 if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) { 1141 cmd->execute_cmd = target_scsi2_reservation_reserve; 1142 if (cdb[0] == RESERVE_10) 1143 size = get_unaligned_be16(&cdb[7]); 1144 else 1145 size = cmd->data_length; 1146 return target_cmd_size_check(cmd, size); 1147 } 1148 } 1149 1150 /* Set DATA_CDB flag for ops that should have it */ 1151 switch (cdb[0]) { 1152 case READ_6: 1153 case READ_10: 1154 case READ_12: 1155 case READ_16: 1156 case WRITE_6: 1157 case WRITE_10: 1158 case WRITE_12: 1159 case WRITE_16: 1160 case WRITE_VERIFY: 1161 case WRITE_VERIFY_12: 1162 case WRITE_VERIFY_16: 1163 case COMPARE_AND_WRITE: 1164 case XDWRITEREAD_10: 1165 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1166 break; 1167 case VARIABLE_LENGTH_CMD: 1168 switch (get_unaligned_be16(&cdb[8])) { 1169 case READ_32: 1170 case WRITE_32: 1171 case WRITE_VERIFY_32: 1172 case XDWRITEREAD_32: 1173 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1174 break; 1175 } 1176 } 1177 1178 cmd->execute_cmd = exec_cmd; 1179 1180 return TCM_NO_SENSE; 1181 } 1182 EXPORT_SYMBOL(passthrough_parse_cdb); 1183