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