1 /******************************************************************************* 2 * Filename: target_core_device.c (based on iscsi_target_device.c) 3 * 4 * This file contains the TCM Virtual Device and Disk Transport 5 * agnostic related functions. 6 * 7 * (c) Copyright 2003-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/net.h> 28 #include <linux/string.h> 29 #include <linux/delay.h> 30 #include <linux/timer.h> 31 #include <linux/slab.h> 32 #include <linux/spinlock.h> 33 #include <linux/kthread.h> 34 #include <linux/in.h> 35 #include <linux/export.h> 36 #include <linux/t10-pi.h> 37 #include <asm/unaligned.h> 38 #include <net/sock.h> 39 #include <net/tcp.h> 40 #include <scsi/scsi_common.h> 41 #include <scsi/scsi_proto.h> 42 43 #include <target/target_core_base.h> 44 #include <target/target_core_backend.h> 45 #include <target/target_core_fabric.h> 46 47 #include "target_core_internal.h" 48 #include "target_core_alua.h" 49 #include "target_core_pr.h" 50 #include "target_core_ua.h" 51 52 DEFINE_MUTEX(g_device_mutex); 53 LIST_HEAD(g_device_list); 54 55 static struct se_hba *lun0_hba; 56 /* not static, needed by tpg.c */ 57 struct se_device *g_lun0_dev; 58 59 sense_reason_t 60 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun) 61 { 62 struct se_lun *se_lun = NULL; 63 struct se_session *se_sess = se_cmd->se_sess; 64 struct se_node_acl *nacl = se_sess->se_node_acl; 65 struct se_dev_entry *deve; 66 sense_reason_t ret = TCM_NO_SENSE; 67 68 rcu_read_lock(); 69 deve = target_nacl_find_deve(nacl, unpacked_lun); 70 if (deve) { 71 atomic_long_inc(&deve->total_cmds); 72 73 if (se_cmd->data_direction == DMA_TO_DEVICE) 74 atomic_long_add(se_cmd->data_length, 75 &deve->write_bytes); 76 else if (se_cmd->data_direction == DMA_FROM_DEVICE) 77 atomic_long_add(se_cmd->data_length, 78 &deve->read_bytes); 79 80 se_lun = rcu_dereference(deve->se_lun); 81 82 if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { 83 se_lun = NULL; 84 goto out_unlock; 85 } 86 87 se_cmd->se_lun = rcu_dereference(deve->se_lun); 88 se_cmd->pr_res_key = deve->pr_res_key; 89 se_cmd->orig_fe_lun = unpacked_lun; 90 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 91 se_cmd->lun_ref_active = true; 92 93 if ((se_cmd->data_direction == DMA_TO_DEVICE) && 94 deve->lun_access_ro) { 95 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN" 96 " Access for 0x%08llx\n", 97 se_cmd->se_tfo->get_fabric_name(), 98 unpacked_lun); 99 rcu_read_unlock(); 100 ret = TCM_WRITE_PROTECTED; 101 goto ref_dev; 102 } 103 } 104 out_unlock: 105 rcu_read_unlock(); 106 107 if (!se_lun) { 108 /* 109 * Use the se_portal_group->tpg_virt_lun0 to allow for 110 * REPORT_LUNS, et al to be returned when no active 111 * MappedLUN=0 exists for this Initiator Port. 112 */ 113 if (unpacked_lun != 0) { 114 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" 115 " Access for 0x%08llx\n", 116 se_cmd->se_tfo->get_fabric_name(), 117 unpacked_lun); 118 return TCM_NON_EXISTENT_LUN; 119 } 120 121 se_lun = se_sess->se_tpg->tpg_virt_lun0; 122 se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0; 123 se_cmd->orig_fe_lun = 0; 124 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 125 126 percpu_ref_get(&se_lun->lun_ref); 127 se_cmd->lun_ref_active = true; 128 129 /* 130 * Force WRITE PROTECT for virtual LUN 0 131 */ 132 if ((se_cmd->data_direction != DMA_FROM_DEVICE) && 133 (se_cmd->data_direction != DMA_NONE)) { 134 ret = TCM_WRITE_PROTECTED; 135 goto ref_dev; 136 } 137 } 138 /* 139 * RCU reference protected by percpu se_lun->lun_ref taken above that 140 * must drop to zero (including initial reference) before this se_lun 141 * pointer can be kfree_rcu() by the final se_lun->lun_group put via 142 * target_core_fabric_configfs.c:target_fabric_port_release 143 */ 144 ref_dev: 145 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); 146 atomic_long_inc(&se_cmd->se_dev->num_cmds); 147 148 if (se_cmd->data_direction == DMA_TO_DEVICE) 149 atomic_long_add(se_cmd->data_length, 150 &se_cmd->se_dev->write_bytes); 151 else if (se_cmd->data_direction == DMA_FROM_DEVICE) 152 atomic_long_add(se_cmd->data_length, 153 &se_cmd->se_dev->read_bytes); 154 155 return ret; 156 } 157 EXPORT_SYMBOL(transport_lookup_cmd_lun); 158 159 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun) 160 { 161 struct se_dev_entry *deve; 162 struct se_lun *se_lun = NULL; 163 struct se_session *se_sess = se_cmd->se_sess; 164 struct se_node_acl *nacl = se_sess->se_node_acl; 165 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 166 unsigned long flags; 167 168 rcu_read_lock(); 169 deve = target_nacl_find_deve(nacl, unpacked_lun); 170 if (deve) { 171 se_cmd->se_lun = rcu_dereference(deve->se_lun); 172 se_lun = rcu_dereference(deve->se_lun); 173 se_cmd->pr_res_key = deve->pr_res_key; 174 se_cmd->orig_fe_lun = unpacked_lun; 175 } 176 rcu_read_unlock(); 177 178 if (!se_lun) { 179 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" 180 " Access for 0x%08llx\n", 181 se_cmd->se_tfo->get_fabric_name(), 182 unpacked_lun); 183 return -ENODEV; 184 } 185 /* 186 * XXX: Add percpu se_lun->lun_ref reference count for TMR 187 */ 188 se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); 189 se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev); 190 191 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags); 192 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list); 193 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags); 194 195 return 0; 196 } 197 EXPORT_SYMBOL(transport_lookup_tmr_lun); 198 199 bool target_lun_is_rdonly(struct se_cmd *cmd) 200 { 201 struct se_session *se_sess = cmd->se_sess; 202 struct se_dev_entry *deve; 203 bool ret; 204 205 rcu_read_lock(); 206 deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun); 207 ret = deve && deve->lun_access_ro; 208 rcu_read_unlock(); 209 210 return ret; 211 } 212 EXPORT_SYMBOL(target_lun_is_rdonly); 213 214 /* 215 * This function is called from core_scsi3_emulate_pro_register_and_move() 216 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref 217 * when a matching rtpi is found. 218 */ 219 struct se_dev_entry *core_get_se_deve_from_rtpi( 220 struct se_node_acl *nacl, 221 u16 rtpi) 222 { 223 struct se_dev_entry *deve; 224 struct se_lun *lun; 225 struct se_portal_group *tpg = nacl->se_tpg; 226 227 rcu_read_lock(); 228 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 229 lun = rcu_dereference(deve->se_lun); 230 if (!lun) { 231 pr_err("%s device entries device pointer is" 232 " NULL, but Initiator has access.\n", 233 tpg->se_tpg_tfo->get_fabric_name()); 234 continue; 235 } 236 if (lun->lun_rtpi != rtpi) 237 continue; 238 239 kref_get(&deve->pr_kref); 240 rcu_read_unlock(); 241 242 return deve; 243 } 244 rcu_read_unlock(); 245 246 return NULL; 247 } 248 249 void core_free_device_list_for_node( 250 struct se_node_acl *nacl, 251 struct se_portal_group *tpg) 252 { 253 struct se_dev_entry *deve; 254 255 mutex_lock(&nacl->lun_entry_mutex); 256 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 257 struct se_lun *lun = rcu_dereference_check(deve->se_lun, 258 lockdep_is_held(&nacl->lun_entry_mutex)); 259 core_disable_device_list_for_node(lun, deve, nacl, tpg); 260 } 261 mutex_unlock(&nacl->lun_entry_mutex); 262 } 263 264 void core_update_device_list_access( 265 u64 mapped_lun, 266 bool lun_access_ro, 267 struct se_node_acl *nacl) 268 { 269 struct se_dev_entry *deve; 270 271 mutex_lock(&nacl->lun_entry_mutex); 272 deve = target_nacl_find_deve(nacl, mapped_lun); 273 if (deve) 274 deve->lun_access_ro = lun_access_ro; 275 mutex_unlock(&nacl->lun_entry_mutex); 276 } 277 278 /* 279 * Called with rcu_read_lock or nacl->device_list_lock held. 280 */ 281 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun) 282 { 283 struct se_dev_entry *deve; 284 285 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) 286 if (deve->mapped_lun == mapped_lun) 287 return deve; 288 289 return NULL; 290 } 291 EXPORT_SYMBOL(target_nacl_find_deve); 292 293 void target_pr_kref_release(struct kref *kref) 294 { 295 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry, 296 pr_kref); 297 complete(&deve->pr_comp); 298 } 299 300 static void 301 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new, 302 bool skip_new) 303 { 304 struct se_dev_entry *tmp; 305 306 rcu_read_lock(); 307 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) { 308 if (skip_new && tmp == new) 309 continue; 310 core_scsi3_ua_allocate(tmp, 0x3F, 311 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED); 312 } 313 rcu_read_unlock(); 314 } 315 316 int core_enable_device_list_for_node( 317 struct se_lun *lun, 318 struct se_lun_acl *lun_acl, 319 u64 mapped_lun, 320 bool lun_access_ro, 321 struct se_node_acl *nacl, 322 struct se_portal_group *tpg) 323 { 324 struct se_dev_entry *orig, *new; 325 326 new = kzalloc(sizeof(*new), GFP_KERNEL); 327 if (!new) { 328 pr_err("Unable to allocate se_dev_entry memory\n"); 329 return -ENOMEM; 330 } 331 332 atomic_set(&new->ua_count, 0); 333 spin_lock_init(&new->ua_lock); 334 INIT_LIST_HEAD(&new->ua_list); 335 INIT_LIST_HEAD(&new->lun_link); 336 337 new->mapped_lun = mapped_lun; 338 kref_init(&new->pr_kref); 339 init_completion(&new->pr_comp); 340 341 new->lun_access_ro = lun_access_ro; 342 new->creation_time = get_jiffies_64(); 343 new->attach_count++; 344 345 mutex_lock(&nacl->lun_entry_mutex); 346 orig = target_nacl_find_deve(nacl, mapped_lun); 347 if (orig && orig->se_lun) { 348 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun, 349 lockdep_is_held(&nacl->lun_entry_mutex)); 350 351 if (orig_lun != lun) { 352 pr_err("Existing orig->se_lun doesn't match new lun" 353 " for dynamic -> explicit NodeACL conversion:" 354 " %s\n", nacl->initiatorname); 355 mutex_unlock(&nacl->lun_entry_mutex); 356 kfree(new); 357 return -EINVAL; 358 } 359 if (orig->se_lun_acl != NULL) { 360 pr_warn_ratelimited("Detected existing explicit" 361 " se_lun_acl->se_lun_group reference for %s" 362 " mapped_lun: %llu, failing\n", 363 nacl->initiatorname, mapped_lun); 364 mutex_unlock(&nacl->lun_entry_mutex); 365 kfree(new); 366 return -EINVAL; 367 } 368 369 rcu_assign_pointer(new->se_lun, lun); 370 rcu_assign_pointer(new->se_lun_acl, lun_acl); 371 hlist_del_rcu(&orig->link); 372 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 373 mutex_unlock(&nacl->lun_entry_mutex); 374 375 spin_lock(&lun->lun_deve_lock); 376 list_del(&orig->lun_link); 377 list_add_tail(&new->lun_link, &lun->lun_deve_list); 378 spin_unlock(&lun->lun_deve_lock); 379 380 kref_put(&orig->pr_kref, target_pr_kref_release); 381 wait_for_completion(&orig->pr_comp); 382 383 target_luns_data_has_changed(nacl, new, true); 384 kfree_rcu(orig, rcu_head); 385 return 0; 386 } 387 388 rcu_assign_pointer(new->se_lun, lun); 389 rcu_assign_pointer(new->se_lun_acl, lun_acl); 390 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 391 mutex_unlock(&nacl->lun_entry_mutex); 392 393 spin_lock(&lun->lun_deve_lock); 394 list_add_tail(&new->lun_link, &lun->lun_deve_list); 395 spin_unlock(&lun->lun_deve_lock); 396 397 target_luns_data_has_changed(nacl, new, true); 398 return 0; 399 } 400 401 /* 402 * Called with se_node_acl->lun_entry_mutex held. 403 */ 404 void core_disable_device_list_for_node( 405 struct se_lun *lun, 406 struct se_dev_entry *orig, 407 struct se_node_acl *nacl, 408 struct se_portal_group *tpg) 409 { 410 /* 411 * rcu_dereference_raw protected by se_lun->lun_group symlink 412 * reference to se_device->dev_group. 413 */ 414 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 415 /* 416 * If the MappedLUN entry is being disabled, the entry in 417 * lun->lun_deve_list must be removed now before clearing the 418 * struct se_dev_entry pointers below as logic in 419 * core_alua_do_transition_tg_pt() depends on these being present. 420 * 421 * deve->se_lun_acl will be NULL for demo-mode created LUNs 422 * that have not been explicitly converted to MappedLUNs -> 423 * struct se_lun_acl, but we remove deve->lun_link from 424 * lun->lun_deve_list. This also means that active UAs and 425 * NodeACL context specific PR metadata for demo-mode 426 * MappedLUN *deve will be released below.. 427 */ 428 spin_lock(&lun->lun_deve_lock); 429 list_del(&orig->lun_link); 430 spin_unlock(&lun->lun_deve_lock); 431 /* 432 * Disable struct se_dev_entry LUN ACL mapping 433 */ 434 core_scsi3_ua_release_all(orig); 435 436 hlist_del_rcu(&orig->link); 437 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); 438 orig->lun_access_ro = false; 439 orig->creation_time = 0; 440 orig->attach_count--; 441 /* 442 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1 443 * or REGISTER_AND_MOVE PR operation to complete. 444 */ 445 kref_put(&orig->pr_kref, target_pr_kref_release); 446 wait_for_completion(&orig->pr_comp); 447 448 rcu_assign_pointer(orig->se_lun, NULL); 449 rcu_assign_pointer(orig->se_lun_acl, NULL); 450 451 kfree_rcu(orig, rcu_head); 452 453 core_scsi3_free_pr_reg_from_nacl(dev, nacl); 454 target_luns_data_has_changed(nacl, NULL, false); 455 } 456 457 /* core_clear_lun_from_tpg(): 458 * 459 * 460 */ 461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) 462 { 463 struct se_node_acl *nacl; 464 struct se_dev_entry *deve; 465 466 mutex_lock(&tpg->acl_node_mutex); 467 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) { 468 469 mutex_lock(&nacl->lun_entry_mutex); 470 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 471 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun, 472 lockdep_is_held(&nacl->lun_entry_mutex)); 473 474 if (lun != tmp_lun) 475 continue; 476 477 core_disable_device_list_for_node(lun, deve, nacl, tpg); 478 } 479 mutex_unlock(&nacl->lun_entry_mutex); 480 } 481 mutex_unlock(&tpg->acl_node_mutex); 482 } 483 484 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev) 485 { 486 struct se_lun *tmp; 487 488 spin_lock(&dev->se_port_lock); 489 if (dev->export_count == 0x0000ffff) { 490 pr_warn("Reached dev->dev_port_count ==" 491 " 0x0000ffff\n"); 492 spin_unlock(&dev->se_port_lock); 493 return -ENOSPC; 494 } 495 again: 496 /* 497 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device 498 * Here is the table from spc4r17 section 7.7.3.8. 499 * 500 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field 501 * 502 * Code Description 503 * 0h Reserved 504 * 1h Relative port 1, historically known as port A 505 * 2h Relative port 2, historically known as port B 506 * 3h to FFFFh Relative port 3 through 65 535 507 */ 508 lun->lun_rtpi = dev->dev_rpti_counter++; 509 if (!lun->lun_rtpi) 510 goto again; 511 512 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) { 513 /* 514 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique 515 * for 16-bit wrap.. 516 */ 517 if (lun->lun_rtpi == tmp->lun_rtpi) 518 goto again; 519 } 520 spin_unlock(&dev->se_port_lock); 521 522 return 0; 523 } 524 525 static void se_release_vpd_for_dev(struct se_device *dev) 526 { 527 struct t10_vpd *vpd, *vpd_tmp; 528 529 spin_lock(&dev->t10_wwn.t10_vpd_lock); 530 list_for_each_entry_safe(vpd, vpd_tmp, 531 &dev->t10_wwn.t10_vpd_list, vpd_list) { 532 list_del(&vpd->vpd_list); 533 kfree(vpd); 534 } 535 spin_unlock(&dev->t10_wwn.t10_vpd_lock); 536 } 537 538 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size) 539 { 540 u32 aligned_max_sectors; 541 u32 alignment; 542 /* 543 * Limit max_sectors to a PAGE_SIZE aligned value for modern 544 * transport_allocate_data_tasks() operation. 545 */ 546 alignment = max(1ul, PAGE_SIZE / block_size); 547 aligned_max_sectors = rounddown(max_sectors, alignment); 548 549 if (max_sectors != aligned_max_sectors) 550 pr_info("Rounding down aligned max_sectors from %u to %u\n", 551 max_sectors, aligned_max_sectors); 552 553 return aligned_max_sectors; 554 } 555 556 int core_dev_add_lun( 557 struct se_portal_group *tpg, 558 struct se_device *dev, 559 struct se_lun *lun) 560 { 561 int rc; 562 563 rc = core_tpg_add_lun(tpg, lun, false, dev); 564 if (rc < 0) 565 return rc; 566 567 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from" 568 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(), 569 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 570 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id); 571 /* 572 * Update LUN maps for dynamically added initiators when 573 * generate_node_acl is enabled. 574 */ 575 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) { 576 struct se_node_acl *acl; 577 578 mutex_lock(&tpg->acl_node_mutex); 579 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 580 if (acl->dynamic_node_acl && 581 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only || 582 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) { 583 core_tpg_add_node_to_devs(acl, tpg, lun); 584 } 585 } 586 mutex_unlock(&tpg->acl_node_mutex); 587 } 588 589 return 0; 590 } 591 592 /* core_dev_del_lun(): 593 * 594 * 595 */ 596 void core_dev_del_lun( 597 struct se_portal_group *tpg, 598 struct se_lun *lun) 599 { 600 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from" 601 " device object\n", tpg->se_tpg_tfo->get_fabric_name(), 602 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 603 tpg->se_tpg_tfo->get_fabric_name()); 604 605 core_tpg_remove_lun(tpg, lun); 606 } 607 608 struct se_lun_acl *core_dev_init_initiator_node_lun_acl( 609 struct se_portal_group *tpg, 610 struct se_node_acl *nacl, 611 u64 mapped_lun, 612 int *ret) 613 { 614 struct se_lun_acl *lacl; 615 616 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) { 617 pr_err("%s InitiatorName exceeds maximum size.\n", 618 tpg->se_tpg_tfo->get_fabric_name()); 619 *ret = -EOVERFLOW; 620 return NULL; 621 } 622 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL); 623 if (!lacl) { 624 pr_err("Unable to allocate memory for struct se_lun_acl.\n"); 625 *ret = -ENOMEM; 626 return NULL; 627 } 628 629 lacl->mapped_lun = mapped_lun; 630 lacl->se_lun_nacl = nacl; 631 632 return lacl; 633 } 634 635 int core_dev_add_initiator_node_lun_acl( 636 struct se_portal_group *tpg, 637 struct se_lun_acl *lacl, 638 struct se_lun *lun, 639 bool lun_access_ro) 640 { 641 struct se_node_acl *nacl = lacl->se_lun_nacl; 642 /* 643 * rcu_dereference_raw protected by se_lun->lun_group symlink 644 * reference to se_device->dev_group. 645 */ 646 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 647 648 if (!nacl) 649 return -EINVAL; 650 651 if (lun->lun_access_ro) 652 lun_access_ro = true; 653 654 lacl->se_lun = lun; 655 656 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun, 657 lun_access_ro, nacl, tpg) < 0) 658 return -EINVAL; 659 660 pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for " 661 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(), 662 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun, 663 lun_access_ro ? "RO" : "RW", 664 nacl->initiatorname); 665 /* 666 * Check to see if there are any existing persistent reservation APTPL 667 * pre-registrations that need to be enabled for this LUN ACL.. 668 */ 669 core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl, 670 lacl->mapped_lun); 671 return 0; 672 } 673 674 int core_dev_del_initiator_node_lun_acl( 675 struct se_lun *lun, 676 struct se_lun_acl *lacl) 677 { 678 struct se_portal_group *tpg = lun->lun_tpg; 679 struct se_node_acl *nacl; 680 struct se_dev_entry *deve; 681 682 nacl = lacl->se_lun_nacl; 683 if (!nacl) 684 return -EINVAL; 685 686 mutex_lock(&nacl->lun_entry_mutex); 687 deve = target_nacl_find_deve(nacl, lacl->mapped_lun); 688 if (deve) 689 core_disable_device_list_for_node(lun, deve, nacl, tpg); 690 mutex_unlock(&nacl->lun_entry_mutex); 691 692 pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for" 693 " InitiatorNode: %s Mapped LUN: %llu\n", 694 tpg->se_tpg_tfo->get_fabric_name(), 695 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 696 nacl->initiatorname, lacl->mapped_lun); 697 698 return 0; 699 } 700 701 void core_dev_free_initiator_node_lun_acl( 702 struct se_portal_group *tpg, 703 struct se_lun_acl *lacl) 704 { 705 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s" 706 " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(), 707 tpg->se_tpg_tfo->tpg_get_tag(tpg), 708 tpg->se_tpg_tfo->get_fabric_name(), 709 lacl->se_lun_nacl->initiatorname, lacl->mapped_lun); 710 711 kfree(lacl); 712 } 713 714 static void scsi_dump_inquiry(struct se_device *dev) 715 { 716 struct t10_wwn *wwn = &dev->t10_wwn; 717 char buf[17]; 718 int i, device_type; 719 /* 720 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer 721 */ 722 for (i = 0; i < 8; i++) 723 if (wwn->vendor[i] >= 0x20) 724 buf[i] = wwn->vendor[i]; 725 else 726 buf[i] = ' '; 727 buf[i] = '\0'; 728 pr_debug(" Vendor: %s\n", buf); 729 730 for (i = 0; i < 16; i++) 731 if (wwn->model[i] >= 0x20) 732 buf[i] = wwn->model[i]; 733 else 734 buf[i] = ' '; 735 buf[i] = '\0'; 736 pr_debug(" Model: %s\n", buf); 737 738 for (i = 0; i < 4; i++) 739 if (wwn->revision[i] >= 0x20) 740 buf[i] = wwn->revision[i]; 741 else 742 buf[i] = ' '; 743 buf[i] = '\0'; 744 pr_debug(" Revision: %s\n", buf); 745 746 device_type = dev->transport->get_device_type(dev); 747 pr_debug(" Type: %s ", scsi_device_type(device_type)); 748 } 749 750 struct se_device *target_alloc_device(struct se_hba *hba, const char *name) 751 { 752 struct se_device *dev; 753 struct se_lun *xcopy_lun; 754 755 dev = hba->backend->ops->alloc_device(hba, name); 756 if (!dev) 757 return NULL; 758 759 dev->dev_link_magic = SE_DEV_LINK_MAGIC; 760 dev->se_hba = hba; 761 dev->transport = hba->backend->ops; 762 dev->prot_length = sizeof(struct t10_pi_tuple); 763 dev->hba_index = hba->hba_index; 764 765 INIT_LIST_HEAD(&dev->dev_list); 766 INIT_LIST_HEAD(&dev->dev_sep_list); 767 INIT_LIST_HEAD(&dev->dev_tmr_list); 768 INIT_LIST_HEAD(&dev->delayed_cmd_list); 769 INIT_LIST_HEAD(&dev->state_list); 770 INIT_LIST_HEAD(&dev->qf_cmd_list); 771 INIT_LIST_HEAD(&dev->g_dev_node); 772 spin_lock_init(&dev->execute_task_lock); 773 spin_lock_init(&dev->delayed_cmd_lock); 774 spin_lock_init(&dev->dev_reservation_lock); 775 spin_lock_init(&dev->se_port_lock); 776 spin_lock_init(&dev->se_tmr_lock); 777 spin_lock_init(&dev->qf_cmd_lock); 778 sema_init(&dev->caw_sem, 1); 779 INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list); 780 spin_lock_init(&dev->t10_wwn.t10_vpd_lock); 781 INIT_LIST_HEAD(&dev->t10_pr.registration_list); 782 INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list); 783 spin_lock_init(&dev->t10_pr.registration_lock); 784 spin_lock_init(&dev->t10_pr.aptpl_reg_lock); 785 INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list); 786 spin_lock_init(&dev->t10_alua.tg_pt_gps_lock); 787 INIT_LIST_HEAD(&dev->t10_alua.lba_map_list); 788 spin_lock_init(&dev->t10_alua.lba_map_lock); 789 790 dev->t10_wwn.t10_dev = dev; 791 dev->t10_alua.t10_dev = dev; 792 793 dev->dev_attrib.da_dev = dev; 794 dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS; 795 dev->dev_attrib.emulate_dpo = 1; 796 dev->dev_attrib.emulate_fua_write = 1; 797 dev->dev_attrib.emulate_fua_read = 1; 798 dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE; 799 dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL; 800 dev->dev_attrib.emulate_tas = DA_EMULATE_TAS; 801 dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU; 802 dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS; 803 dev->dev_attrib.emulate_caw = DA_EMULATE_CAW; 804 dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC; 805 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT; 806 dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS; 807 dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL; 808 dev->dev_attrib.is_nonrot = DA_IS_NONROT; 809 dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD; 810 dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT; 811 dev->dev_attrib.max_unmap_block_desc_count = 812 DA_MAX_UNMAP_BLOCK_DESC_COUNT; 813 dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT; 814 dev->dev_attrib.unmap_granularity_alignment = 815 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT; 816 dev->dev_attrib.unmap_zeroes_data = 817 DA_UNMAP_ZEROES_DATA_DEFAULT; 818 dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN; 819 820 xcopy_lun = &dev->xcopy_lun; 821 rcu_assign_pointer(xcopy_lun->lun_se_dev, dev); 822 init_completion(&xcopy_lun->lun_ref_comp); 823 init_completion(&xcopy_lun->lun_shutdown_comp); 824 INIT_LIST_HEAD(&xcopy_lun->lun_deve_list); 825 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link); 826 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex); 827 xcopy_lun->lun_tpg = &xcopy_pt_tpg; 828 829 return dev; 830 } 831 832 /* 833 * Check if the underlying struct block_device request_queue supports 834 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 835 * in ATA and we need to set TPE=1 836 */ 837 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, 838 struct request_queue *q) 839 { 840 int block_size = queue_logical_block_size(q); 841 842 if (!blk_queue_discard(q)) 843 return false; 844 845 attrib->max_unmap_lba_count = 846 q->limits.max_discard_sectors >> (ilog2(block_size) - 9); 847 /* 848 * Currently hardcoded to 1 in Linux/SCSI code.. 849 */ 850 attrib->max_unmap_block_desc_count = 1; 851 attrib->unmap_granularity = q->limits.discard_granularity / block_size; 852 attrib->unmap_granularity_alignment = q->limits.discard_alignment / 853 block_size; 854 attrib->unmap_zeroes_data = 0; 855 return true; 856 } 857 EXPORT_SYMBOL(target_configure_unmap_from_queue); 858 859 /* 860 * Convert from blocksize advertised to the initiator to the 512 byte 861 * units unconditionally used by the Linux block layer. 862 */ 863 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb) 864 { 865 switch (dev->dev_attrib.block_size) { 866 case 4096: 867 return lb << 3; 868 case 2048: 869 return lb << 2; 870 case 1024: 871 return lb << 1; 872 default: 873 return lb; 874 } 875 } 876 EXPORT_SYMBOL(target_to_linux_sector); 877 878 int target_configure_device(struct se_device *dev) 879 { 880 struct se_hba *hba = dev->se_hba; 881 int ret; 882 883 if (dev->dev_flags & DF_CONFIGURED) { 884 pr_err("se_dev->se_dev_ptr already set for storage" 885 " object\n"); 886 return -EEXIST; 887 } 888 889 ret = dev->transport->configure_device(dev); 890 if (ret) 891 goto out; 892 /* 893 * XXX: there is not much point to have two different values here.. 894 */ 895 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size; 896 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth; 897 898 /* 899 * Align max_hw_sectors down to PAGE_SIZE I/O transfers 900 */ 901 dev->dev_attrib.hw_max_sectors = 902 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors, 903 dev->dev_attrib.hw_block_size); 904 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors; 905 906 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); 907 dev->creation_time = get_jiffies_64(); 908 909 ret = core_setup_alua(dev); 910 if (ret) 911 goto out; 912 913 /* 914 * Startup the struct se_device processing thread 915 */ 916 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, 917 dev->transport->name); 918 if (!dev->tmr_wq) { 919 pr_err("Unable to create tmr workqueue for %s\n", 920 dev->transport->name); 921 ret = -ENOMEM; 922 goto out_free_alua; 923 } 924 925 /* 926 * Setup work_queue for QUEUE_FULL 927 */ 928 INIT_WORK(&dev->qf_work_queue, target_qf_do_work); 929 930 /* 931 * Preload the initial INQUIRY const values if we are doing 932 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI 933 * passthrough because this is being provided by the backend LLD. 934 */ 935 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) { 936 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8); 937 strncpy(&dev->t10_wwn.model[0], 938 dev->transport->inquiry_prod, 16); 939 strncpy(&dev->t10_wwn.revision[0], 940 dev->transport->inquiry_rev, 4); 941 } 942 943 scsi_dump_inquiry(dev); 944 945 spin_lock(&hba->device_lock); 946 hba->dev_count++; 947 spin_unlock(&hba->device_lock); 948 949 mutex_lock(&g_device_mutex); 950 list_add_tail(&dev->g_dev_node, &g_device_list); 951 mutex_unlock(&g_device_mutex); 952 953 dev->dev_flags |= DF_CONFIGURED; 954 955 return 0; 956 957 out_free_alua: 958 core_alua_free_lu_gp_mem(dev); 959 out: 960 se_release_vpd_for_dev(dev); 961 return ret; 962 } 963 964 void target_free_device(struct se_device *dev) 965 { 966 struct se_hba *hba = dev->se_hba; 967 968 WARN_ON(!list_empty(&dev->dev_sep_list)); 969 970 if (dev->dev_flags & DF_CONFIGURED) { 971 destroy_workqueue(dev->tmr_wq); 972 973 mutex_lock(&g_device_mutex); 974 list_del(&dev->g_dev_node); 975 mutex_unlock(&g_device_mutex); 976 977 spin_lock(&hba->device_lock); 978 hba->dev_count--; 979 spin_unlock(&hba->device_lock); 980 } 981 982 core_alua_free_lu_gp_mem(dev); 983 core_alua_set_lba_map(dev, NULL, 0, 0); 984 core_scsi3_free_all_registrations(dev); 985 se_release_vpd_for_dev(dev); 986 987 if (dev->transport->free_prot) 988 dev->transport->free_prot(dev); 989 990 dev->transport->free_device(dev); 991 } 992 993 int core_dev_setup_virtual_lun0(void) 994 { 995 struct se_hba *hba; 996 struct se_device *dev; 997 char buf[] = "rd_pages=8,rd_nullio=1"; 998 int ret; 999 1000 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE); 1001 if (IS_ERR(hba)) 1002 return PTR_ERR(hba); 1003 1004 dev = target_alloc_device(hba, "virt_lun0"); 1005 if (!dev) { 1006 ret = -ENOMEM; 1007 goto out_free_hba; 1008 } 1009 1010 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf)); 1011 1012 ret = target_configure_device(dev); 1013 if (ret) 1014 goto out_free_se_dev; 1015 1016 lun0_hba = hba; 1017 g_lun0_dev = dev; 1018 return 0; 1019 1020 out_free_se_dev: 1021 target_free_device(dev); 1022 out_free_hba: 1023 core_delete_hba(hba); 1024 return ret; 1025 } 1026 1027 1028 void core_dev_release_virtual_lun0(void) 1029 { 1030 struct se_hba *hba = lun0_hba; 1031 1032 if (!hba) 1033 return; 1034 1035 if (g_lun0_dev) 1036 target_free_device(g_lun0_dev); 1037 core_delete_hba(hba); 1038 } 1039 1040 /* 1041 * Common CDB parsing for kernel and user passthrough. 1042 */ 1043 sense_reason_t 1044 passthrough_parse_cdb(struct se_cmd *cmd, 1045 sense_reason_t (*exec_cmd)(struct se_cmd *cmd)) 1046 { 1047 unsigned char *cdb = cmd->t_task_cdb; 1048 1049 /* 1050 * Clear a lun set in the cdb if the initiator talking to use spoke 1051 * and old standards version, as we can't assume the underlying device 1052 * won't choke up on it. 1053 */ 1054 switch (cdb[0]) { 1055 case READ_10: /* SBC - RDProtect */ 1056 case READ_12: /* SBC - RDProtect */ 1057 case READ_16: /* SBC - RDProtect */ 1058 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ 1059 case VERIFY: /* SBC - VRProtect */ 1060 case VERIFY_16: /* SBC - VRProtect */ 1061 case WRITE_VERIFY: /* SBC - VRProtect */ 1062 case WRITE_VERIFY_12: /* SBC - VRProtect */ 1063 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */ 1064 break; 1065 default: 1066 cdb[1] &= 0x1f; /* clear logical unit number */ 1067 break; 1068 } 1069 1070 /* 1071 * For REPORT LUNS we always need to emulate the response, for everything 1072 * else, pass it up. 1073 */ 1074 if (cdb[0] == REPORT_LUNS) { 1075 cmd->execute_cmd = spc_emulate_report_luns; 1076 return TCM_NO_SENSE; 1077 } 1078 1079 /* Set DATA_CDB flag for ops that should have it */ 1080 switch (cdb[0]) { 1081 case READ_6: 1082 case READ_10: 1083 case READ_12: 1084 case READ_16: 1085 case WRITE_6: 1086 case WRITE_10: 1087 case WRITE_12: 1088 case WRITE_16: 1089 case WRITE_VERIFY: 1090 case WRITE_VERIFY_12: 1091 case 0x8e: /* WRITE_VERIFY_16 */ 1092 case COMPARE_AND_WRITE: 1093 case XDWRITEREAD_10: 1094 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1095 break; 1096 case VARIABLE_LENGTH_CMD: 1097 switch (get_unaligned_be16(&cdb[8])) { 1098 case READ_32: 1099 case WRITE_32: 1100 case 0x0c: /* WRITE_VERIFY_32 */ 1101 case XDWRITEREAD_32: 1102 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1103 break; 1104 } 1105 } 1106 1107 cmd->execute_cmd = exec_cmd; 1108 1109 return TCM_NO_SENSE; 1110 } 1111 EXPORT_SYMBOL(passthrough_parse_cdb); 1112