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_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) { 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_flags & TRANSPORT_LUNFLAGS_READ_ONLY); 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 u32 lun_access, 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 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) { 270 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY; 271 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE; 272 } else { 273 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE; 274 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY; 275 } 276 } 277 mutex_unlock(&nacl->lun_entry_mutex); 278 } 279 280 /* 281 * Called with rcu_read_lock or nacl->device_list_lock held. 282 */ 283 struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun) 284 { 285 struct se_dev_entry *deve; 286 287 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) 288 if (deve->mapped_lun == mapped_lun) 289 return deve; 290 291 return NULL; 292 } 293 EXPORT_SYMBOL(target_nacl_find_deve); 294 295 void target_pr_kref_release(struct kref *kref) 296 { 297 struct se_dev_entry *deve = container_of(kref, struct se_dev_entry, 298 pr_kref); 299 complete(&deve->pr_comp); 300 } 301 302 static void 303 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new, 304 bool skip_new) 305 { 306 struct se_dev_entry *tmp; 307 308 rcu_read_lock(); 309 hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) { 310 if (skip_new && tmp == new) 311 continue; 312 core_scsi3_ua_allocate(tmp, 0x3F, 313 ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED); 314 } 315 rcu_read_unlock(); 316 } 317 318 int core_enable_device_list_for_node( 319 struct se_lun *lun, 320 struct se_lun_acl *lun_acl, 321 u64 mapped_lun, 322 u32 lun_access, 323 struct se_node_acl *nacl, 324 struct se_portal_group *tpg) 325 { 326 struct se_dev_entry *orig, *new; 327 328 new = kzalloc(sizeof(*new), GFP_KERNEL); 329 if (!new) { 330 pr_err("Unable to allocate se_dev_entry memory\n"); 331 return -ENOMEM; 332 } 333 334 atomic_set(&new->ua_count, 0); 335 spin_lock_init(&new->ua_lock); 336 INIT_LIST_HEAD(&new->ua_list); 337 INIT_LIST_HEAD(&new->lun_link); 338 339 new->mapped_lun = mapped_lun; 340 kref_init(&new->pr_kref); 341 init_completion(&new->pr_comp); 342 343 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) 344 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE; 345 else 346 new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY; 347 348 new->creation_time = get_jiffies_64(); 349 new->attach_count++; 350 351 mutex_lock(&nacl->lun_entry_mutex); 352 orig = target_nacl_find_deve(nacl, mapped_lun); 353 if (orig && orig->se_lun) { 354 struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun, 355 lockdep_is_held(&nacl->lun_entry_mutex)); 356 357 if (orig_lun != lun) { 358 pr_err("Existing orig->se_lun doesn't match new lun" 359 " for dynamic -> explicit NodeACL conversion:" 360 " %s\n", nacl->initiatorname); 361 mutex_unlock(&nacl->lun_entry_mutex); 362 kfree(new); 363 return -EINVAL; 364 } 365 BUG_ON(orig->se_lun_acl != NULL); 366 367 rcu_assign_pointer(new->se_lun, lun); 368 rcu_assign_pointer(new->se_lun_acl, lun_acl); 369 hlist_del_rcu(&orig->link); 370 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 371 mutex_unlock(&nacl->lun_entry_mutex); 372 373 spin_lock(&lun->lun_deve_lock); 374 list_del(&orig->lun_link); 375 list_add_tail(&new->lun_link, &lun->lun_deve_list); 376 spin_unlock(&lun->lun_deve_lock); 377 378 kref_put(&orig->pr_kref, target_pr_kref_release); 379 wait_for_completion(&orig->pr_comp); 380 381 target_luns_data_has_changed(nacl, new, true); 382 kfree_rcu(orig, rcu_head); 383 return 0; 384 } 385 386 rcu_assign_pointer(new->se_lun, lun); 387 rcu_assign_pointer(new->se_lun_acl, lun_acl); 388 hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); 389 mutex_unlock(&nacl->lun_entry_mutex); 390 391 spin_lock(&lun->lun_deve_lock); 392 list_add_tail(&new->lun_link, &lun->lun_deve_list); 393 spin_unlock(&lun->lun_deve_lock); 394 395 target_luns_data_has_changed(nacl, new, true); 396 return 0; 397 } 398 399 /* 400 * Called with se_node_acl->lun_entry_mutex held. 401 */ 402 void core_disable_device_list_for_node( 403 struct se_lun *lun, 404 struct se_dev_entry *orig, 405 struct se_node_acl *nacl, 406 struct se_portal_group *tpg) 407 { 408 /* 409 * rcu_dereference_raw protected by se_lun->lun_group symlink 410 * reference to se_device->dev_group. 411 */ 412 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 413 /* 414 * If the MappedLUN entry is being disabled, the entry in 415 * lun->lun_deve_list must be removed now before clearing the 416 * struct se_dev_entry pointers below as logic in 417 * core_alua_do_transition_tg_pt() depends on these being present. 418 * 419 * deve->se_lun_acl will be NULL for demo-mode created LUNs 420 * that have not been explicitly converted to MappedLUNs -> 421 * struct se_lun_acl, but we remove deve->lun_link from 422 * lun->lun_deve_list. This also means that active UAs and 423 * NodeACL context specific PR metadata for demo-mode 424 * MappedLUN *deve will be released below.. 425 */ 426 spin_lock(&lun->lun_deve_lock); 427 list_del(&orig->lun_link); 428 spin_unlock(&lun->lun_deve_lock); 429 /* 430 * Disable struct se_dev_entry LUN ACL mapping 431 */ 432 core_scsi3_ua_release_all(orig); 433 434 hlist_del_rcu(&orig->link); 435 clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); 436 orig->lun_flags = 0; 437 orig->creation_time = 0; 438 orig->attach_count--; 439 /* 440 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1 441 * or REGISTER_AND_MOVE PR operation to complete. 442 */ 443 kref_put(&orig->pr_kref, target_pr_kref_release); 444 wait_for_completion(&orig->pr_comp); 445 446 rcu_assign_pointer(orig->se_lun, NULL); 447 rcu_assign_pointer(orig->se_lun_acl, NULL); 448 449 kfree_rcu(orig, rcu_head); 450 451 core_scsi3_free_pr_reg_from_nacl(dev, nacl); 452 target_luns_data_has_changed(nacl, NULL, false); 453 } 454 455 /* core_clear_lun_from_tpg(): 456 * 457 * 458 */ 459 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) 460 { 461 struct se_node_acl *nacl; 462 struct se_dev_entry *deve; 463 464 mutex_lock(&tpg->acl_node_mutex); 465 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) { 466 467 mutex_lock(&nacl->lun_entry_mutex); 468 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 469 struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun, 470 lockdep_is_held(&nacl->lun_entry_mutex)); 471 472 if (lun != tmp_lun) 473 continue; 474 475 core_disable_device_list_for_node(lun, deve, nacl, tpg); 476 } 477 mutex_unlock(&nacl->lun_entry_mutex); 478 } 479 mutex_unlock(&tpg->acl_node_mutex); 480 } 481 482 int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev) 483 { 484 struct se_lun *tmp; 485 486 spin_lock(&dev->se_port_lock); 487 if (dev->export_count == 0x0000ffff) { 488 pr_warn("Reached dev->dev_port_count ==" 489 " 0x0000ffff\n"); 490 spin_unlock(&dev->se_port_lock); 491 return -ENOSPC; 492 } 493 again: 494 /* 495 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device 496 * Here is the table from spc4r17 section 7.7.3.8. 497 * 498 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field 499 * 500 * Code Description 501 * 0h Reserved 502 * 1h Relative port 1, historically known as port A 503 * 2h Relative port 2, historically known as port B 504 * 3h to FFFFh Relative port 3 through 65 535 505 */ 506 lun->lun_rtpi = dev->dev_rpti_counter++; 507 if (!lun->lun_rtpi) 508 goto again; 509 510 list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) { 511 /* 512 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique 513 * for 16-bit wrap.. 514 */ 515 if (lun->lun_rtpi == tmp->lun_rtpi) 516 goto again; 517 } 518 spin_unlock(&dev->se_port_lock); 519 520 return 0; 521 } 522 523 static void se_release_vpd_for_dev(struct se_device *dev) 524 { 525 struct t10_vpd *vpd, *vpd_tmp; 526 527 spin_lock(&dev->t10_wwn.t10_vpd_lock); 528 list_for_each_entry_safe(vpd, vpd_tmp, 529 &dev->t10_wwn.t10_vpd_list, vpd_list) { 530 list_del(&vpd->vpd_list); 531 kfree(vpd); 532 } 533 spin_unlock(&dev->t10_wwn.t10_vpd_lock); 534 } 535 536 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size) 537 { 538 u32 aligned_max_sectors; 539 u32 alignment; 540 /* 541 * Limit max_sectors to a PAGE_SIZE aligned value for modern 542 * transport_allocate_data_tasks() operation. 543 */ 544 alignment = max(1ul, PAGE_SIZE / block_size); 545 aligned_max_sectors = rounddown(max_sectors, alignment); 546 547 if (max_sectors != aligned_max_sectors) 548 pr_info("Rounding down aligned max_sectors from %u to %u\n", 549 max_sectors, aligned_max_sectors); 550 551 return aligned_max_sectors; 552 } 553 554 int core_dev_add_lun( 555 struct se_portal_group *tpg, 556 struct se_device *dev, 557 struct se_lun *lun) 558 { 559 int rc; 560 561 rc = core_tpg_add_lun(tpg, lun, 562 TRANSPORT_LUNFLAGS_READ_WRITE, dev); 563 if (rc < 0) 564 return rc; 565 566 pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from" 567 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(), 568 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 569 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id); 570 /* 571 * Update LUN maps for dynamically added initiators when 572 * generate_node_acl is enabled. 573 */ 574 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) { 575 struct se_node_acl *acl; 576 577 mutex_lock(&tpg->acl_node_mutex); 578 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { 579 if (acl->dynamic_node_acl && 580 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only || 581 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) { 582 core_tpg_add_node_to_devs(acl, tpg, lun); 583 } 584 } 585 mutex_unlock(&tpg->acl_node_mutex); 586 } 587 588 return 0; 589 } 590 591 /* core_dev_del_lun(): 592 * 593 * 594 */ 595 void core_dev_del_lun( 596 struct se_portal_group *tpg, 597 struct se_lun *lun) 598 { 599 pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from" 600 " device object\n", tpg->se_tpg_tfo->get_fabric_name(), 601 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, 602 tpg->se_tpg_tfo->get_fabric_name()); 603 604 core_tpg_remove_lun(tpg, lun); 605 } 606 607 struct se_lun_acl *core_dev_init_initiator_node_lun_acl( 608 struct se_portal_group *tpg, 609 struct se_node_acl *nacl, 610 u64 mapped_lun, 611 int *ret) 612 { 613 struct se_lun_acl *lacl; 614 615 if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) { 616 pr_err("%s InitiatorName exceeds maximum size.\n", 617 tpg->se_tpg_tfo->get_fabric_name()); 618 *ret = -EOVERFLOW; 619 return NULL; 620 } 621 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL); 622 if (!lacl) { 623 pr_err("Unable to allocate memory for struct se_lun_acl.\n"); 624 *ret = -ENOMEM; 625 return NULL; 626 } 627 628 lacl->mapped_lun = mapped_lun; 629 lacl->se_lun_nacl = nacl; 630 631 return lacl; 632 } 633 634 int core_dev_add_initiator_node_lun_acl( 635 struct se_portal_group *tpg, 636 struct se_lun_acl *lacl, 637 struct se_lun *lun, 638 u32 lun_access) 639 { 640 struct se_node_acl *nacl = lacl->se_lun_nacl; 641 /* 642 * rcu_dereference_raw protected by se_lun->lun_group symlink 643 * reference to se_device->dev_group. 644 */ 645 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 646 647 if (!nacl) 648 return -EINVAL; 649 650 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) && 651 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)) 652 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; 653 654 lacl->se_lun = lun; 655 656 if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun, 657 lun_access, 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 & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO", 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_LIST_HEAD(&xcopy_lun->lun_deve_list); 824 INIT_LIST_HEAD(&xcopy_lun->lun_dev_link); 825 mutex_init(&xcopy_lun->lun_tg_pt_md_mutex); 826 xcopy_lun->lun_tpg = &xcopy_pt_tpg; 827 828 return dev; 829 } 830 831 int target_configure_device(struct se_device *dev) 832 { 833 struct se_hba *hba = dev->se_hba; 834 int ret; 835 836 if (dev->dev_flags & DF_CONFIGURED) { 837 pr_err("se_dev->se_dev_ptr already set for storage" 838 " object\n"); 839 return -EEXIST; 840 } 841 842 ret = dev->transport->configure_device(dev); 843 if (ret) 844 goto out; 845 /* 846 * XXX: there is not much point to have two different values here.. 847 */ 848 dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size; 849 dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth; 850 851 /* 852 * Align max_hw_sectors down to PAGE_SIZE I/O transfers 853 */ 854 dev->dev_attrib.hw_max_sectors = 855 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors, 856 dev->dev_attrib.hw_block_size); 857 dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors; 858 859 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); 860 dev->creation_time = get_jiffies_64(); 861 862 ret = core_setup_alua(dev); 863 if (ret) 864 goto out; 865 866 /* 867 * Startup the struct se_device processing thread 868 */ 869 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, 870 dev->transport->name); 871 if (!dev->tmr_wq) { 872 pr_err("Unable to create tmr workqueue for %s\n", 873 dev->transport->name); 874 ret = -ENOMEM; 875 goto out_free_alua; 876 } 877 878 /* 879 * Setup work_queue for QUEUE_FULL 880 */ 881 INIT_WORK(&dev->qf_work_queue, target_qf_do_work); 882 883 /* 884 * Preload the initial INQUIRY const values if we are doing 885 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI 886 * passthrough because this is being provided by the backend LLD. 887 */ 888 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) { 889 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8); 890 strncpy(&dev->t10_wwn.model[0], 891 dev->transport->inquiry_prod, 16); 892 strncpy(&dev->t10_wwn.revision[0], 893 dev->transport->inquiry_rev, 4); 894 } 895 896 scsi_dump_inquiry(dev); 897 898 spin_lock(&hba->device_lock); 899 hba->dev_count++; 900 spin_unlock(&hba->device_lock); 901 902 mutex_lock(&g_device_mutex); 903 list_add_tail(&dev->g_dev_node, &g_device_list); 904 mutex_unlock(&g_device_mutex); 905 906 dev->dev_flags |= DF_CONFIGURED; 907 908 return 0; 909 910 out_free_alua: 911 core_alua_free_lu_gp_mem(dev); 912 out: 913 se_release_vpd_for_dev(dev); 914 return ret; 915 } 916 917 void target_free_device(struct se_device *dev) 918 { 919 struct se_hba *hba = dev->se_hba; 920 921 WARN_ON(!list_empty(&dev->dev_sep_list)); 922 923 if (dev->dev_flags & DF_CONFIGURED) { 924 destroy_workqueue(dev->tmr_wq); 925 926 mutex_lock(&g_device_mutex); 927 list_del(&dev->g_dev_node); 928 mutex_unlock(&g_device_mutex); 929 930 spin_lock(&hba->device_lock); 931 hba->dev_count--; 932 spin_unlock(&hba->device_lock); 933 } 934 935 core_alua_free_lu_gp_mem(dev); 936 core_alua_set_lba_map(dev, NULL, 0, 0); 937 core_scsi3_free_all_registrations(dev); 938 se_release_vpd_for_dev(dev); 939 940 if (dev->transport->free_prot) 941 dev->transport->free_prot(dev); 942 943 dev->transport->free_device(dev); 944 } 945 946 int core_dev_setup_virtual_lun0(void) 947 { 948 struct se_hba *hba; 949 struct se_device *dev; 950 char buf[] = "rd_pages=8,rd_nullio=1"; 951 int ret; 952 953 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE); 954 if (IS_ERR(hba)) 955 return PTR_ERR(hba); 956 957 dev = target_alloc_device(hba, "virt_lun0"); 958 if (!dev) { 959 ret = -ENOMEM; 960 goto out_free_hba; 961 } 962 963 hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf)); 964 965 ret = target_configure_device(dev); 966 if (ret) 967 goto out_free_se_dev; 968 969 lun0_hba = hba; 970 g_lun0_dev = dev; 971 return 0; 972 973 out_free_se_dev: 974 target_free_device(dev); 975 out_free_hba: 976 core_delete_hba(hba); 977 return ret; 978 } 979 980 981 void core_dev_release_virtual_lun0(void) 982 { 983 struct se_hba *hba = lun0_hba; 984 985 if (!hba) 986 return; 987 988 if (g_lun0_dev) 989 target_free_device(g_lun0_dev); 990 core_delete_hba(hba); 991 } 992 993 /* 994 * Common CDB parsing for kernel and user passthrough. 995 */ 996 sense_reason_t 997 passthrough_parse_cdb(struct se_cmd *cmd, 998 sense_reason_t (*exec_cmd)(struct se_cmd *cmd)) 999 { 1000 unsigned char *cdb = cmd->t_task_cdb; 1001 1002 /* 1003 * Clear a lun set in the cdb if the initiator talking to use spoke 1004 * and old standards version, as we can't assume the underlying device 1005 * won't choke up on it. 1006 */ 1007 switch (cdb[0]) { 1008 case READ_10: /* SBC - RDProtect */ 1009 case READ_12: /* SBC - RDProtect */ 1010 case READ_16: /* SBC - RDProtect */ 1011 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ 1012 case VERIFY: /* SBC - VRProtect */ 1013 case VERIFY_16: /* SBC - VRProtect */ 1014 case WRITE_VERIFY: /* SBC - VRProtect */ 1015 case WRITE_VERIFY_12: /* SBC - VRProtect */ 1016 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */ 1017 break; 1018 default: 1019 cdb[1] &= 0x1f; /* clear logical unit number */ 1020 break; 1021 } 1022 1023 /* 1024 * For REPORT LUNS we always need to emulate the response, for everything 1025 * else, pass it up. 1026 */ 1027 if (cdb[0] == REPORT_LUNS) { 1028 cmd->execute_cmd = spc_emulate_report_luns; 1029 return TCM_NO_SENSE; 1030 } 1031 1032 /* Set DATA_CDB flag for ops that should have it */ 1033 switch (cdb[0]) { 1034 case READ_6: 1035 case READ_10: 1036 case READ_12: 1037 case READ_16: 1038 case WRITE_6: 1039 case WRITE_10: 1040 case WRITE_12: 1041 case WRITE_16: 1042 case WRITE_VERIFY: 1043 case WRITE_VERIFY_12: 1044 case 0x8e: /* WRITE_VERIFY_16 */ 1045 case COMPARE_AND_WRITE: 1046 case XDWRITEREAD_10: 1047 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1048 break; 1049 case VARIABLE_LENGTH_CMD: 1050 switch (get_unaligned_be16(&cdb[8])) { 1051 case READ_32: 1052 case WRITE_32: 1053 case 0x0c: /* WRITE_VERIFY_32 */ 1054 case XDWRITEREAD_32: 1055 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1056 break; 1057 } 1058 } 1059 1060 cmd->execute_cmd = exec_cmd; 1061 1062 return TCM_NO_SENSE; 1063 } 1064 EXPORT_SYMBOL(passthrough_parse_cdb); 1065