1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_pr.c 4 * 5 * This file contains SPC-3 compliant persistent reservations and 6 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 7 * 8 * (c) Copyright 2009-2013 Datera, Inc. 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 ******************************************************************************/ 13 14 #include <linux/slab.h> 15 #include <linux/spinlock.h> 16 #include <linux/list.h> 17 #include <linux/vmalloc.h> 18 #include <linux/file.h> 19 #include <linux/fcntl.h> 20 #include <linux/fs.h> 21 #include <scsi/scsi_proto.h> 22 #include <linux/unaligned.h> 23 24 #include <target/target_core_base.h> 25 #include <target/target_core_backend.h> 26 #include <target/target_core_fabric.h> 27 28 #include "target_core_internal.h" 29 #include "target_core_pr.h" 30 #include "target_core_ua.h" 31 32 /* 33 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 34 */ 35 struct pr_transport_id_holder { 36 struct t10_pr_registration *dest_pr_reg; 37 struct se_portal_group *dest_tpg; 38 struct se_node_acl *dest_node_acl; 39 struct se_dev_entry *dest_se_deve; 40 struct list_head dest_list; 41 }; 42 43 void core_pr_dump_initiator_port( 44 struct t10_pr_registration *pr_reg, 45 char *buf, 46 u32 size) 47 { 48 if (!pr_reg->isid_present_at_reg) { 49 buf[0] = '\0'; 50 return; 51 } 52 53 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 54 } 55 56 enum register_type { 57 REGISTER, 58 REGISTER_AND_IGNORE_EXISTING_KEY, 59 REGISTER_AND_MOVE, 60 }; 61 62 enum preempt_type { 63 PREEMPT, 64 PREEMPT_AND_ABORT, 65 }; 66 67 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 68 struct t10_pr_registration *, int, int); 69 70 static int is_reservation_holder( 71 struct t10_pr_registration *pr_res_holder, 72 struct t10_pr_registration *pr_reg) 73 { 74 int pr_res_type; 75 76 if (pr_res_holder) { 77 pr_res_type = pr_res_holder->pr_res_type; 78 79 return pr_res_holder == pr_reg || 80 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 81 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 82 } 83 return 0; 84 } 85 86 static sense_reason_t 87 target_scsi2_reservation_check(struct se_cmd *cmd) 88 { 89 struct se_device *dev = cmd->se_dev; 90 struct se_session *sess = cmd->se_sess; 91 92 switch (cmd->t_task_cdb[0]) { 93 case INQUIRY: 94 case RELEASE_6: 95 case RELEASE_10: 96 return 0; 97 default: 98 break; 99 } 100 101 if (!dev->reservation_holder || !sess) 102 return 0; 103 104 if (dev->reservation_holder->se_node_acl != sess->se_node_acl) 105 return TCM_RESERVATION_CONFLICT; 106 107 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 108 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 109 return TCM_RESERVATION_CONFLICT; 110 } 111 112 return 0; 113 } 114 115 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 116 struct se_node_acl *, struct se_session *); 117 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 118 119 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 120 { 121 struct se_session *se_sess = cmd->se_sess; 122 struct se_device *dev = cmd->se_dev; 123 struct t10_pr_registration *pr_reg; 124 struct t10_reservation *pr_tmpl = &dev->t10_pr; 125 int conflict = 0; 126 127 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 128 se_sess); 129 if (pr_reg) { 130 /* 131 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 132 * behavior 133 * 134 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 135 * status, but no reservation shall be established and the 136 * persistent reservation shall not be changed, if the command 137 * is received from a) and b) below. 138 * 139 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 140 * status, but the persistent reservation shall not be released, 141 * if the command is received from a) and b) 142 * 143 * a) An I_T nexus that is a persistent reservation holder; or 144 * b) An I_T nexus that is registered if a registrants only or 145 * all registrants type persistent reservation is present. 146 * 147 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 148 * RELEASE(6) command, or RELEASE(10) command shall be processed 149 * as defined in SPC-2. 150 */ 151 if (pr_reg->pr_res_holder) { 152 core_scsi3_put_pr_reg(pr_reg); 153 return 1; 154 } 155 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 156 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 157 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 158 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 159 core_scsi3_put_pr_reg(pr_reg); 160 return 1; 161 } 162 core_scsi3_put_pr_reg(pr_reg); 163 conflict = 1; 164 } else { 165 /* 166 * Following spc2r20 5.5.1 Reservations overview: 167 * 168 * If a logical unit has executed a PERSISTENT RESERVE OUT 169 * command with the REGISTER or the REGISTER AND IGNORE 170 * EXISTING KEY service action and is still registered by any 171 * initiator, all RESERVE commands and all RELEASE commands 172 * regardless of initiator shall conflict and shall terminate 173 * with a RESERVATION CONFLICT status. 174 */ 175 spin_lock(&pr_tmpl->registration_lock); 176 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 177 spin_unlock(&pr_tmpl->registration_lock); 178 } 179 180 if (conflict) { 181 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 182 " while active SPC-3 registrations exist," 183 " returning RESERVATION_CONFLICT\n"); 184 return -EBUSY; 185 } 186 187 return 0; 188 } 189 190 void target_release_reservation(struct se_device *dev) 191 { 192 dev->reservation_holder = NULL; 193 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 194 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 195 dev->dev_res_bin_isid = 0; 196 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 197 } 198 } 199 200 sense_reason_t 201 target_scsi2_reservation_release(struct se_cmd *cmd) 202 { 203 struct se_device *dev = cmd->se_dev; 204 struct se_session *sess = cmd->se_sess; 205 struct se_portal_group *tpg; 206 int rc; 207 208 if (!sess || !sess->se_tpg) 209 goto out; 210 rc = target_check_scsi2_reservation_conflict(cmd); 211 if (rc == 1) 212 goto out; 213 if (rc < 0) 214 return TCM_RESERVATION_CONFLICT; 215 216 spin_lock(&dev->dev_reservation_lock); 217 if (!dev->reservation_holder || !sess) 218 goto out_unlock; 219 220 if (dev->reservation_holder->se_node_acl != sess->se_node_acl) 221 goto out_unlock; 222 223 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 224 goto out_unlock; 225 226 target_release_reservation(dev); 227 tpg = sess->se_tpg; 228 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 229 " MAPPED LUN: %llu for %s\n", 230 tpg->se_tpg_tfo->fabric_name, 231 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 232 sess->se_node_acl->initiatorname); 233 234 out_unlock: 235 spin_unlock(&dev->dev_reservation_lock); 236 out: 237 target_complete_cmd(cmd, SAM_STAT_GOOD); 238 return 0; 239 } 240 241 sense_reason_t 242 target_scsi2_reservation_reserve(struct se_cmd *cmd) 243 { 244 struct se_device *dev = cmd->se_dev; 245 struct se_session *sess = cmd->se_sess; 246 struct se_portal_group *tpg; 247 sense_reason_t ret = 0; 248 int rc; 249 250 if ((cmd->t_task_cdb[1] & 0x01) && 251 (cmd->t_task_cdb[1] & 0x02)) { 252 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 253 return TCM_UNSUPPORTED_SCSI_OPCODE; 254 } 255 /* 256 * This is currently the case for target_core_mod passthrough struct se_cmd 257 * ops 258 */ 259 if (!sess || !sess->se_tpg) 260 goto out; 261 rc = target_check_scsi2_reservation_conflict(cmd); 262 if (rc == 1) 263 goto out; 264 265 if (rc < 0) 266 return TCM_RESERVATION_CONFLICT; 267 268 tpg = sess->se_tpg; 269 spin_lock(&dev->dev_reservation_lock); 270 if (dev->reservation_holder && 271 dev->reservation_holder->se_node_acl != sess->se_node_acl) { 272 pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n", 273 tpg->se_tpg_tfo->fabric_name); 274 pr_err("Original reserver LUN: %llu %s\n", 275 cmd->se_lun->unpacked_lun, 276 dev->reservation_holder->se_node_acl->initiatorname); 277 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 278 " from %s \n", cmd->se_lun->unpacked_lun, 279 cmd->orig_fe_lun, 280 sess->se_node_acl->initiatorname); 281 ret = TCM_RESERVATION_CONFLICT; 282 goto out_unlock; 283 } 284 285 dev->reservation_holder = sess; 286 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 287 if (sess->sess_bin_isid != 0) { 288 dev->dev_res_bin_isid = sess->sess_bin_isid; 289 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 290 } 291 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 292 " for %s\n", tpg->se_tpg_tfo->fabric_name, 293 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 294 sess->se_node_acl->initiatorname); 295 296 out_unlock: 297 spin_unlock(&dev->dev_reservation_lock); 298 out: 299 if (!ret) 300 target_complete_cmd(cmd, SAM_STAT_GOOD); 301 return ret; 302 } 303 304 305 /* 306 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 307 * 308 * This function is called by those initiator ports who are *NOT* 309 * the active PR reservation holder when a reservation is present. 310 */ 311 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 312 bool isid_mismatch) 313 { 314 unsigned char *cdb = cmd->t_task_cdb; 315 struct se_session *se_sess = cmd->se_sess; 316 struct se_node_acl *nacl = se_sess->se_node_acl; 317 int other_cdb = 0; 318 int registered_nexus = 0, ret = 1; /* Conflict by default */ 319 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 320 int we = 0; /* Write Exclusive */ 321 int legacy = 0; /* Act like a legacy device and return 322 * RESERVATION CONFLICT on some CDBs */ 323 324 if (isid_mismatch) { 325 registered_nexus = 0; 326 } else { 327 struct se_dev_entry *se_deve; 328 329 rcu_read_lock(); 330 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 331 if (se_deve) 332 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 333 &se_deve->deve_flags); 334 rcu_read_unlock(); 335 } 336 337 switch (pr_reg_type) { 338 case PR_TYPE_WRITE_EXCLUSIVE: 339 we = 1; 340 fallthrough; 341 case PR_TYPE_EXCLUSIVE_ACCESS: 342 /* 343 * Some commands are only allowed for the persistent reservation 344 * holder. 345 */ 346 break; 347 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 348 we = 1; 349 fallthrough; 350 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 351 /* 352 * Some commands are only allowed for registered I_T Nexuses. 353 */ 354 reg_only = 1; 355 break; 356 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 357 we = 1; 358 fallthrough; 359 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 360 /* 361 * Each registered I_T Nexus is a reservation holder. 362 */ 363 all_reg = 1; 364 break; 365 default: 366 return -EINVAL; 367 } 368 /* 369 * Referenced from spc4r17 table 45 for *NON* PR holder access 370 */ 371 switch (cdb[0]) { 372 case SECURITY_PROTOCOL_IN: 373 if (registered_nexus) 374 return 0; 375 ret = (we) ? 0 : 1; 376 break; 377 case MODE_SENSE: 378 case MODE_SENSE_10: 379 case READ_ATTRIBUTE: 380 case READ_BUFFER: 381 case RECEIVE_DIAGNOSTIC: 382 if (legacy) { 383 ret = 1; 384 break; 385 } 386 if (registered_nexus) { 387 ret = 0; 388 break; 389 } 390 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 391 break; 392 case PERSISTENT_RESERVE_OUT: 393 /* 394 * This follows PERSISTENT_RESERVE_OUT service actions that 395 * are allowed in the presence of various reservations. 396 * See spc4r17, table 46 397 */ 398 switch (cdb[1] & 0x1f) { 399 case PRO_CLEAR: 400 case PRO_PREEMPT: 401 case PRO_PREEMPT_AND_ABORT: 402 ret = (registered_nexus) ? 0 : 1; 403 break; 404 case PRO_REGISTER: 405 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 406 ret = 0; 407 break; 408 case PRO_REGISTER_AND_MOVE: 409 case PRO_RESERVE: 410 ret = 1; 411 break; 412 case PRO_RELEASE: 413 ret = (registered_nexus) ? 0 : 1; 414 break; 415 default: 416 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 417 " action: 0x%02x\n", cdb[1] & 0x1f); 418 return -EINVAL; 419 } 420 break; 421 case RELEASE_6: 422 case RELEASE_10: 423 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 424 ret = 0; 425 break; 426 case RESERVE_6: 427 case RESERVE_10: 428 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 429 ret = 0; 430 break; 431 case TEST_UNIT_READY: 432 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 433 break; 434 case MAINTENANCE_IN: 435 switch (cdb[1] & 0x1f) { 436 case MI_MANAGEMENT_PROTOCOL_IN: 437 if (registered_nexus) { 438 ret = 0; 439 break; 440 } 441 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 442 break; 443 case MI_REPORT_SUPPORTED_OPERATION_CODES: 444 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 445 if (legacy) { 446 ret = 1; 447 break; 448 } 449 if (registered_nexus) { 450 ret = 0; 451 break; 452 } 453 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 454 break; 455 case MI_REPORT_ALIASES: 456 case MI_REPORT_IDENTIFYING_INFORMATION: 457 case MI_REPORT_PRIORITY: 458 case MI_REPORT_TARGET_PGS: 459 case MI_REPORT_TIMESTAMP: 460 ret = 0; /* Allowed */ 461 break; 462 default: 463 pr_err("Unknown MI Service Action: 0x%02x\n", 464 (cdb[1] & 0x1f)); 465 return -EINVAL; 466 } 467 break; 468 case ACCESS_CONTROL_IN: 469 case ACCESS_CONTROL_OUT: 470 case INQUIRY: 471 case LOG_SENSE: 472 case SERVICE_ACTION_IN_12: 473 case READ_CAPACITY: 474 case REPORT_LUNS: 475 case REQUEST_SENSE: 476 case PERSISTENT_RESERVE_IN: 477 ret = 0; /*/ Allowed CDBs */ 478 break; 479 default: 480 other_cdb = 1; 481 break; 482 } 483 /* 484 * Case where the CDB is explicitly allowed in the above switch 485 * statement. 486 */ 487 if (!ret && !other_cdb) { 488 pr_debug("Allowing explicit CDB: 0x%02x for %s" 489 " reservation holder\n", cdb[0], 490 core_scsi3_pr_dump_type(pr_reg_type)); 491 492 return ret; 493 } 494 /* 495 * Check if write exclusive initiator ports *NOT* holding the 496 * WRITE_EXCLUSIVE_* reservation. 497 */ 498 if (we && !registered_nexus) { 499 if (cmd->data_direction == DMA_TO_DEVICE) { 500 /* 501 * Conflict for write exclusive 502 */ 503 pr_debug("%s Conflict for unregistered nexus" 504 " %s CDB: 0x%02x to %s reservation\n", 505 transport_dump_cmd_direction(cmd), 506 se_sess->se_node_acl->initiatorname, cdb[0], 507 core_scsi3_pr_dump_type(pr_reg_type)); 508 return 1; 509 } else { 510 /* 511 * Allow non WRITE CDBs for all Write Exclusive 512 * PR TYPEs to pass for registered and 513 * non-registered_nexuxes NOT holding the reservation. 514 * 515 * We only make noise for the unregisterd nexuses, 516 * as we expect registered non-reservation holding 517 * nexuses to issue CDBs. 518 */ 519 520 if (!registered_nexus) { 521 pr_debug("Allowing implicit CDB: 0x%02x" 522 " for %s reservation on unregistered" 523 " nexus\n", cdb[0], 524 core_scsi3_pr_dump_type(pr_reg_type)); 525 } 526 527 return 0; 528 } 529 } else if ((reg_only) || (all_reg)) { 530 if (registered_nexus) { 531 /* 532 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 533 * allow commands from registered nexuses. 534 */ 535 536 pr_debug("Allowing implicit CDB: 0x%02x for %s" 537 " reservation\n", cdb[0], 538 core_scsi3_pr_dump_type(pr_reg_type)); 539 540 return 0; 541 } 542 } else if (we && registered_nexus) { 543 /* 544 * Reads are allowed for Write Exclusive locks 545 * from all registrants. 546 */ 547 if (cmd->data_direction == DMA_FROM_DEVICE) { 548 pr_debug("Allowing READ CDB: 0x%02x for %s" 549 " reservation\n", cdb[0], 550 core_scsi3_pr_dump_type(pr_reg_type)); 551 552 return 0; 553 } 554 } 555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 556 " for %s reservation\n", transport_dump_cmd_direction(cmd), 557 (registered_nexus) ? "" : "un", 558 se_sess->se_node_acl->initiatorname, cdb[0], 559 core_scsi3_pr_dump_type(pr_reg_type)); 560 561 return 1; /* Conflict by default */ 562 } 563 564 static sense_reason_t 565 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 566 { 567 struct se_device *dev = cmd->se_dev; 568 struct se_session *sess = cmd->se_sess; 569 u32 pr_reg_type; 570 bool isid_mismatch = false; 571 572 if (!dev->dev_pr_res_holder) 573 return 0; 574 575 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 576 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 577 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 578 goto check_nonholder; 579 580 if (dev->dev_pr_res_holder->isid_present_at_reg) { 581 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 582 sess->sess_bin_isid) { 583 isid_mismatch = true; 584 goto check_nonholder; 585 } 586 } 587 588 return 0; 589 590 check_nonholder: 591 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 592 return TCM_RESERVATION_CONFLICT; 593 return 0; 594 } 595 596 static u32 core_scsi3_pr_generation(struct se_device *dev) 597 { 598 u32 prg; 599 600 /* 601 * PRGeneration field shall contain the value of a 32-bit wrapping 602 * counter mainted by the device server. 603 * 604 * Note that this is done regardless of Active Persist across 605 * Target PowerLoss (APTPL) 606 * 607 * See spc4r17 section 6.3.12 READ_KEYS service action 608 */ 609 spin_lock(&dev->dev_reservation_lock); 610 prg = dev->t10_pr.pr_generation++; 611 spin_unlock(&dev->dev_reservation_lock); 612 613 return prg; 614 } 615 616 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 617 struct se_device *dev, 618 struct se_node_acl *nacl, 619 struct se_lun *lun, 620 struct se_dev_entry *dest_deve, 621 u64 mapped_lun, 622 unsigned char *isid, 623 u64 sa_res_key, 624 int all_tg_pt, 625 int aptpl) 626 { 627 struct t10_pr_registration *pr_reg; 628 629 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 630 if (!pr_reg) { 631 pr_err("Unable to allocate struct t10_pr_registration\n"); 632 return NULL; 633 } 634 635 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 636 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 637 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 640 atomic_set(&pr_reg->pr_res_holders, 0); 641 pr_reg->pr_reg_nacl = nacl; 642 /* 643 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 644 * the se_dev_entry->pr_ref will have been already obtained by 645 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 646 * 647 * Otherwise, locate se_dev_entry now and obtain a reference until 648 * registration completes in __core_scsi3_add_registration(). 649 */ 650 if (dest_deve) { 651 pr_reg->pr_reg_deve = dest_deve; 652 } else { 653 rcu_read_lock(); 654 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 655 if (!pr_reg->pr_reg_deve) { 656 rcu_read_unlock(); 657 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 658 nacl->initiatorname, mapped_lun); 659 kmem_cache_free(t10_pr_reg_cache, pr_reg); 660 return NULL; 661 } 662 kref_get(&pr_reg->pr_reg_deve->pr_kref); 663 rcu_read_unlock(); 664 } 665 pr_reg->pr_res_mapped_lun = mapped_lun; 666 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 667 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 668 pr_reg->pr_res_key = sa_res_key; 669 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 670 pr_reg->pr_reg_aptpl = aptpl; 671 /* 672 * If an ISID value for this SCSI Initiator Port exists, 673 * save it to the registration now. 674 */ 675 if (isid != NULL) { 676 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 677 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 678 pr_reg->isid_present_at_reg = 1; 679 } 680 681 return pr_reg; 682 } 683 684 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 685 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 686 687 /* 688 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 689 * modes. 690 */ 691 static struct t10_pr_registration *__core_scsi3_alloc_registration( 692 struct se_device *dev, 693 struct se_node_acl *nacl, 694 struct se_lun *lun, 695 struct se_dev_entry *deve, 696 u64 mapped_lun, 697 unsigned char *isid, 698 u64 sa_res_key, 699 int all_tg_pt, 700 int aptpl) 701 { 702 struct se_dev_entry *deve_tmp; 703 struct se_node_acl *nacl_tmp; 704 struct se_lun_acl *lacl_tmp; 705 struct se_lun *lun_tmp, *next, *dest_lun; 706 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 707 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 708 int ret; 709 /* 710 * Create a registration for the I_T Nexus upon which the 711 * PROUT REGISTER was received. 712 */ 713 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 714 isid, sa_res_key, all_tg_pt, 715 aptpl); 716 if (!pr_reg) 717 return NULL; 718 /* 719 * Return pointer to pr_reg for ALL_TG_PT=0 720 */ 721 if (!all_tg_pt) 722 return pr_reg; 723 /* 724 * Create list of matching SCSI Initiator Port registrations 725 * for ALL_TG_PT=1 726 */ 727 spin_lock(&dev->se_port_lock); 728 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 729 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 730 continue; 731 spin_unlock(&dev->se_port_lock); 732 733 spin_lock(&lun_tmp->lun_deve_lock); 734 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 735 /* 736 * This pointer will be NULL for demo mode MappedLUNs 737 * that have not been make explicit via a ConfigFS 738 * MappedLUN group for the SCSI Initiator Node ACL. 739 */ 740 if (!deve_tmp->se_lun_acl) 741 continue; 742 743 lacl_tmp = deve_tmp->se_lun_acl; 744 nacl_tmp = lacl_tmp->se_lun_nacl; 745 /* 746 * Skip the matching struct se_node_acl that is allocated 747 * above.. 748 */ 749 if (nacl == nacl_tmp) 750 continue; 751 /* 752 * Only perform PR registrations for target ports on 753 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 754 * arrived. 755 */ 756 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 757 continue; 758 /* 759 * Look for a matching Initiator Node ACL in ASCII format 760 */ 761 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 762 continue; 763 764 kref_get(&deve_tmp->pr_kref); 765 spin_unlock(&lun_tmp->lun_deve_lock); 766 /* 767 * Grab a configfs group dependency that is released 768 * for the exception path at label out: below, or upon 769 * completion of adding ALL_TG_PT=1 registrations in 770 * __core_scsi3_add_registration() 771 */ 772 ret = core_scsi3_lunacl_depend_item(deve_tmp); 773 if (ret < 0) { 774 pr_err("core_scsi3_lunacl_depend" 775 "_item() failed\n"); 776 percpu_ref_put(&lun_tmp->lun_ref); 777 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 778 goto out; 779 } 780 /* 781 * Located a matching SCSI Initiator Port on a different 782 * port, allocate the pr_reg_atp and attach it to the 783 * pr_reg->pr_reg_atp_list that will be processed once 784 * the original *pr_reg is processed in 785 * __core_scsi3_add_registration() 786 */ 787 dest_lun = deve_tmp->se_lun; 788 789 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 790 nacl_tmp, dest_lun, deve_tmp, 791 deve_tmp->mapped_lun, NULL, 792 sa_res_key, all_tg_pt, aptpl); 793 if (!pr_reg_atp) { 794 percpu_ref_put(&lun_tmp->lun_ref); 795 core_scsi3_lunacl_undepend_item(deve_tmp); 796 goto out; 797 } 798 799 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 800 &pr_reg->pr_reg_atp_list); 801 spin_lock(&lun_tmp->lun_deve_lock); 802 } 803 spin_unlock(&lun_tmp->lun_deve_lock); 804 805 spin_lock(&dev->se_port_lock); 806 percpu_ref_put(&lun_tmp->lun_ref); 807 } 808 spin_unlock(&dev->se_port_lock); 809 810 return pr_reg; 811 out: 812 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 813 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 814 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 815 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 816 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 817 } 818 kmem_cache_free(t10_pr_reg_cache, pr_reg); 819 return NULL; 820 } 821 822 int core_scsi3_alloc_aptpl_registration( 823 struct t10_reservation *pr_tmpl, 824 u64 sa_res_key, 825 unsigned char *i_port, 826 unsigned char *isid, 827 u64 mapped_lun, 828 unsigned char *t_port, 829 u16 tpgt, 830 u64 target_lun, 831 int res_holder, 832 int all_tg_pt, 833 u8 type) 834 { 835 struct t10_pr_registration *pr_reg; 836 837 if (!i_port || !t_port || !sa_res_key) { 838 pr_err("Illegal parameters for APTPL registration\n"); 839 return -EINVAL; 840 } 841 842 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 843 if (!pr_reg) { 844 pr_err("Unable to allocate struct t10_pr_registration\n"); 845 return -ENOMEM; 846 } 847 848 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 849 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 850 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 851 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 853 atomic_set(&pr_reg->pr_res_holders, 0); 854 pr_reg->pr_reg_nacl = NULL; 855 pr_reg->pr_reg_deve = NULL; 856 pr_reg->pr_res_mapped_lun = mapped_lun; 857 pr_reg->pr_aptpl_target_lun = target_lun; 858 pr_reg->pr_res_key = sa_res_key; 859 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 860 pr_reg->pr_reg_aptpl = 1; 861 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 862 pr_reg->pr_res_type = type; 863 /* 864 * If an ISID value had been saved in APTPL metadata for this 865 * SCSI Initiator Port, restore it now. 866 */ 867 if (isid != NULL) { 868 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 869 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 870 pr_reg->isid_present_at_reg = 1; 871 } 872 /* 873 * Copy the i_port and t_port information from caller. 874 */ 875 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 876 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 877 pr_reg->pr_reg_tpgt = tpgt; 878 /* 879 * Set pr_res_holder from caller, the pr_reg who is the reservation 880 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 881 * the Initiator Node LUN ACL from the fabric module is created for 882 * this registration. 883 */ 884 pr_reg->pr_res_holder = res_holder; 885 886 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 887 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 888 " metadata\n", (res_holder) ? "+reservation" : ""); 889 return 0; 890 } 891 892 static void core_scsi3_aptpl_reserve( 893 struct se_device *dev, 894 struct se_portal_group *tpg, 895 struct se_node_acl *node_acl, 896 struct t10_pr_registration *pr_reg) 897 { 898 char i_buf[PR_REG_ISID_ID_LEN] = { }; 899 900 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 901 902 spin_lock(&dev->dev_reservation_lock); 903 dev->dev_pr_res_holder = pr_reg; 904 spin_unlock(&dev->dev_reservation_lock); 905 906 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 907 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 908 tpg->se_tpg_tfo->fabric_name, 909 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 910 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 911 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 912 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname, 913 i_buf); 914 } 915 916 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 917 struct t10_pr_registration *, enum register_type, int); 918 919 static int __core_scsi3_check_aptpl_registration( 920 struct se_device *dev, 921 struct se_portal_group *tpg, 922 struct se_lun *lun, 923 u64 target_lun, 924 struct se_node_acl *nacl, 925 u64 mapped_lun) 926 { 927 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 928 struct t10_reservation *pr_tmpl = &dev->t10_pr; 929 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { }; 930 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { }; 931 u16 tpgt; 932 933 /* 934 * Copy Initiator Port information from struct se_node_acl 935 */ 936 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 937 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 938 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 939 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 940 /* 941 * Look for the matching registrations+reservation from those 942 * created from APTPL metadata. Note that multiple registrations 943 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 944 * TransportIDs. 945 */ 946 spin_lock(&pr_tmpl->aptpl_reg_lock); 947 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 948 pr_reg_aptpl_list) { 949 950 if (!strcmp(pr_reg->pr_iport, i_port) && 951 (pr_reg->pr_res_mapped_lun == mapped_lun) && 952 !(strcmp(pr_reg->pr_tport, t_port)) && 953 (pr_reg->pr_reg_tpgt == tpgt) && 954 (pr_reg->pr_aptpl_target_lun == target_lun)) { 955 /* 956 * Obtain the ->pr_reg_deve pointer + reference, that 957 * is released by __core_scsi3_add_registration() below. 958 */ 959 rcu_read_lock(); 960 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 961 if (!pr_reg->pr_reg_deve) { 962 pr_err("Unable to locate PR APTPL %s mapped_lun:" 963 " %llu\n", nacl->initiatorname, mapped_lun); 964 rcu_read_unlock(); 965 continue; 966 } 967 kref_get(&pr_reg->pr_reg_deve->pr_kref); 968 rcu_read_unlock(); 969 970 pr_reg->pr_reg_nacl = nacl; 971 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 972 list_del(&pr_reg->pr_reg_aptpl_list); 973 spin_unlock(&pr_tmpl->aptpl_reg_lock); 974 /* 975 * At this point all of the pointers in *pr_reg will 976 * be setup, so go ahead and add the registration. 977 */ 978 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 979 /* 980 * If this registration is the reservation holder, 981 * make that happen now.. 982 */ 983 if (pr_reg->pr_res_holder) 984 core_scsi3_aptpl_reserve(dev, tpg, 985 nacl, pr_reg); 986 /* 987 * Reenable pr_aptpl_active to accept new metadata 988 * updates once the SCSI device is active again.. 989 */ 990 spin_lock(&pr_tmpl->aptpl_reg_lock); 991 pr_tmpl->pr_aptpl_active = 1; 992 } 993 } 994 spin_unlock(&pr_tmpl->aptpl_reg_lock); 995 996 return 0; 997 } 998 999 int core_scsi3_check_aptpl_registration( 1000 struct se_device *dev, 1001 struct se_portal_group *tpg, 1002 struct se_lun *lun, 1003 struct se_node_acl *nacl, 1004 u64 mapped_lun) 1005 { 1006 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1007 return 0; 1008 1009 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1010 lun->unpacked_lun, nacl, 1011 mapped_lun); 1012 } 1013 1014 static void __core_scsi3_dump_registration( 1015 const struct target_core_fabric_ops *tfo, 1016 struct se_device *dev, 1017 struct se_node_acl *nacl, 1018 struct t10_pr_registration *pr_reg, 1019 enum register_type register_type) 1020 { 1021 struct se_portal_group *se_tpg = nacl->se_tpg; 1022 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1023 1024 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1025 1026 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1027 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ? 1028 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1029 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1030 i_buf); 1031 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1032 tfo->fabric_name, tfo->tpg_get_wwn(se_tpg), 1033 tfo->tpg_get_tag(se_tpg)); 1034 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1035 " Port(s)\n", tfo->fabric_name, 1036 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1037 dev->transport->name); 1038 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1039 " 0x%08x APTPL: %d\n", tfo->fabric_name, 1040 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1041 pr_reg->pr_reg_aptpl); 1042 } 1043 1044 static void __core_scsi3_add_registration( 1045 struct se_device *dev, 1046 struct se_node_acl *nacl, 1047 struct t10_pr_registration *pr_reg, 1048 enum register_type register_type, 1049 int register_move) 1050 { 1051 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1052 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1053 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1054 struct se_dev_entry *deve; 1055 1056 /* 1057 * Increment PRgeneration counter for struct se_device upon a successful 1058 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1059 * 1060 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1061 * action, the struct se_device->dev_reservation_lock will already be held, 1062 * so we do not call core_scsi3_pr_generation() which grabs the lock 1063 * for the REGISTER. 1064 */ 1065 pr_reg->pr_res_generation = (register_move) ? 1066 dev->t10_pr.pr_generation++ : 1067 core_scsi3_pr_generation(dev); 1068 1069 spin_lock(&pr_tmpl->registration_lock); 1070 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1071 1072 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1073 spin_unlock(&pr_tmpl->registration_lock); 1074 /* 1075 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1076 */ 1077 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1078 goto out; 1079 /* 1080 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1081 * allocated in __core_scsi3_alloc_registration() 1082 */ 1083 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1084 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1085 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1086 1087 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1088 1089 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1090 1091 spin_lock(&pr_tmpl->registration_lock); 1092 list_add_tail(&pr_reg_tmp->pr_reg_list, 1093 &pr_tmpl->registration_list); 1094 1095 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1096 register_type); 1097 spin_unlock(&pr_tmpl->registration_lock); 1098 /* 1099 * Drop configfs group dependency reference and deve->pr_kref 1100 * obtained from __core_scsi3_alloc_registration() code. 1101 */ 1102 rcu_read_lock(); 1103 deve = pr_reg_tmp->pr_reg_deve; 1104 if (deve) { 1105 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1106 core_scsi3_lunacl_undepend_item(deve); 1107 pr_reg_tmp->pr_reg_deve = NULL; 1108 } 1109 rcu_read_unlock(); 1110 } 1111 out: 1112 /* 1113 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1114 */ 1115 rcu_read_lock(); 1116 deve = pr_reg->pr_reg_deve; 1117 if (deve) { 1118 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1119 kref_put(&deve->pr_kref, target_pr_kref_release); 1120 pr_reg->pr_reg_deve = NULL; 1121 } 1122 rcu_read_unlock(); 1123 } 1124 1125 static int core_scsi3_alloc_registration( 1126 struct se_device *dev, 1127 struct se_node_acl *nacl, 1128 struct se_lun *lun, 1129 struct se_dev_entry *deve, 1130 u64 mapped_lun, 1131 unsigned char *isid, 1132 u64 sa_res_key, 1133 int all_tg_pt, 1134 int aptpl, 1135 enum register_type register_type, 1136 int register_move) 1137 { 1138 struct t10_pr_registration *pr_reg; 1139 1140 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1141 isid, sa_res_key, all_tg_pt, 1142 aptpl); 1143 if (!pr_reg) 1144 return -EPERM; 1145 1146 __core_scsi3_add_registration(dev, nacl, pr_reg, 1147 register_type, register_move); 1148 return 0; 1149 } 1150 1151 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1152 struct se_device *dev, 1153 struct se_node_acl *nacl, 1154 unsigned char *isid) 1155 { 1156 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1157 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1158 1159 spin_lock(&pr_tmpl->registration_lock); 1160 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1161 &pr_tmpl->registration_list, pr_reg_list) { 1162 /* 1163 * First look for a matching struct se_node_acl 1164 */ 1165 if (pr_reg->pr_reg_nacl != nacl) 1166 continue; 1167 1168 /* 1169 * If this registration does NOT contain a fabric provided 1170 * ISID, then we have found a match. 1171 */ 1172 if (!pr_reg->isid_present_at_reg) { 1173 atomic_inc_mb(&pr_reg->pr_res_holders); 1174 spin_unlock(&pr_tmpl->registration_lock); 1175 return pr_reg; 1176 } 1177 /* 1178 * If the *pr_reg contains a fabric defined ISID for multi-value 1179 * SCSI Initiator Port TransportIDs, then we expect a valid 1180 * matching ISID to be provided by the local SCSI Initiator Port. 1181 */ 1182 if (!isid) 1183 continue; 1184 if (strcmp(isid, pr_reg->pr_reg_isid)) 1185 continue; 1186 1187 atomic_inc_mb(&pr_reg->pr_res_holders); 1188 spin_unlock(&pr_tmpl->registration_lock); 1189 return pr_reg; 1190 } 1191 spin_unlock(&pr_tmpl->registration_lock); 1192 1193 return NULL; 1194 } 1195 1196 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1197 struct se_device *dev, 1198 struct se_node_acl *nacl, 1199 struct se_session *sess) 1200 { 1201 struct se_portal_group *tpg = nacl->se_tpg; 1202 unsigned char buf[PR_REG_ISID_LEN] = { }; 1203 unsigned char *isid_ptr = NULL; 1204 1205 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1206 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1207 PR_REG_ISID_LEN); 1208 isid_ptr = &buf[0]; 1209 } 1210 1211 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1212 } 1213 1214 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1215 { 1216 atomic_dec_mb(&pr_reg->pr_res_holders); 1217 } 1218 1219 static int core_scsi3_check_implicit_release( 1220 struct se_device *dev, 1221 struct t10_pr_registration *pr_reg) 1222 { 1223 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1224 struct t10_pr_registration *pr_res_holder; 1225 int ret = 0; 1226 1227 spin_lock(&dev->dev_reservation_lock); 1228 pr_res_holder = dev->dev_pr_res_holder; 1229 if (!pr_res_holder) { 1230 spin_unlock(&dev->dev_reservation_lock); 1231 return ret; 1232 } 1233 if (pr_res_holder == pr_reg) { 1234 /* 1235 * Perform an implicit RELEASE if the registration that 1236 * is being released is holding the reservation. 1237 * 1238 * From spc4r17, section 5.7.11.1: 1239 * 1240 * e) If the I_T nexus is the persistent reservation holder 1241 * and the persistent reservation is not an all registrants 1242 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1243 * service action or REGISTER AND IGNORE EXISTING KEY 1244 * service action with the SERVICE ACTION RESERVATION KEY 1245 * field set to zero (see 5.7.11.3). 1246 */ 1247 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1248 ret = 1; 1249 /* 1250 * For 'All Registrants' reservation types, all existing 1251 * registrations are still processed as reservation holders 1252 * in core_scsi3_pr_seq_non_holder() after the initial 1253 * reservation holder is implicitly released here. 1254 */ 1255 } else if (pr_reg->pr_reg_all_tg_pt && 1256 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1257 pr_reg->pr_reg_nacl->initiatorname)) && 1258 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1259 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1260 " UNREGISTER while existing reservation with matching" 1261 " key 0x%016Lx is present from another SCSI Initiator" 1262 " Port\n", pr_reg->pr_res_key); 1263 ret = -EPERM; 1264 } 1265 spin_unlock(&dev->dev_reservation_lock); 1266 1267 return ret; 1268 } 1269 1270 static void __core_scsi3_free_registration( 1271 struct se_device *dev, 1272 struct t10_pr_registration *pr_reg, 1273 struct list_head *preempt_and_abort_list, 1274 int dec_holders) 1275 __releases(&pr_tmpl->registration_lock) 1276 __acquires(&pr_tmpl->registration_lock) 1277 { 1278 const struct target_core_fabric_ops *tfo = 1279 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1280 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1281 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1282 struct se_dev_entry *deve; 1283 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1284 1285 lockdep_assert_held(&pr_tmpl->registration_lock); 1286 1287 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1288 1289 if (!list_empty(&pr_reg->pr_reg_list)) 1290 list_del(&pr_reg->pr_reg_list); 1291 /* 1292 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1293 * so call core_scsi3_put_pr_reg() to decrement our reference. 1294 */ 1295 if (dec_holders) 1296 core_scsi3_put_pr_reg(pr_reg); 1297 1298 spin_unlock(&pr_tmpl->registration_lock); 1299 /* 1300 * Wait until all reference from any other I_T nexuses for this 1301 * *pr_reg have been released. Because list_del() is called above, 1302 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1303 * count back to zero, and we release *pr_reg. 1304 */ 1305 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1306 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1307 tfo->fabric_name); 1308 cpu_relax(); 1309 } 1310 1311 rcu_read_lock(); 1312 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1313 if (deve) 1314 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1315 rcu_read_unlock(); 1316 1317 spin_lock(&pr_tmpl->registration_lock); 1318 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1319 " Node: %s%s\n", tfo->fabric_name, 1320 pr_reg->pr_reg_nacl->initiatorname, 1321 i_buf); 1322 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1323 " Port(s)\n", tfo->fabric_name, 1324 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1325 dev->transport->name); 1326 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1327 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, 1328 pr_reg->pr_res_generation); 1329 1330 if (!preempt_and_abort_list) { 1331 pr_reg->pr_reg_deve = NULL; 1332 pr_reg->pr_reg_nacl = NULL; 1333 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1334 return; 1335 } 1336 /* 1337 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1338 * are released once the ABORT_TASK_SET has completed.. 1339 */ 1340 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1341 } 1342 1343 void core_scsi3_free_pr_reg_from_nacl( 1344 struct se_device *dev, 1345 struct se_node_acl *nacl) 1346 { 1347 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1348 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1349 bool free_reg = false; 1350 /* 1351 * If the passed se_node_acl matches the reservation holder, 1352 * release the reservation. 1353 */ 1354 spin_lock(&dev->dev_reservation_lock); 1355 pr_res_holder = dev->dev_pr_res_holder; 1356 if ((pr_res_holder != NULL) && 1357 (pr_res_holder->pr_reg_nacl == nacl)) { 1358 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1359 free_reg = true; 1360 } 1361 spin_unlock(&dev->dev_reservation_lock); 1362 /* 1363 * Release any registration associated with the struct se_node_acl. 1364 */ 1365 spin_lock(&pr_tmpl->registration_lock); 1366 if (pr_res_holder && free_reg) 1367 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1368 1369 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1370 &pr_tmpl->registration_list, pr_reg_list) { 1371 1372 if (pr_reg->pr_reg_nacl != nacl) 1373 continue; 1374 1375 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1376 } 1377 spin_unlock(&pr_tmpl->registration_lock); 1378 } 1379 1380 void core_scsi3_free_all_registrations( 1381 struct se_device *dev) 1382 { 1383 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1384 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1385 1386 spin_lock(&dev->dev_reservation_lock); 1387 pr_res_holder = dev->dev_pr_res_holder; 1388 if (pr_res_holder != NULL) { 1389 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1390 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1391 pr_res_holder, 0, 0); 1392 } 1393 spin_unlock(&dev->dev_reservation_lock); 1394 1395 spin_lock(&pr_tmpl->registration_lock); 1396 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1397 &pr_tmpl->registration_list, pr_reg_list) { 1398 1399 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1400 } 1401 spin_unlock(&pr_tmpl->registration_lock); 1402 1403 spin_lock(&pr_tmpl->aptpl_reg_lock); 1404 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1405 pr_reg_aptpl_list) { 1406 list_del(&pr_reg->pr_reg_aptpl_list); 1407 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1408 } 1409 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1410 } 1411 1412 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1413 { 1414 return target_depend_item(&tpg->tpg_group.cg_item); 1415 } 1416 1417 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1418 { 1419 target_undepend_item(&tpg->tpg_group.cg_item); 1420 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1421 } 1422 1423 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1424 { 1425 if (nacl->dynamic_node_acl) 1426 return 0; 1427 return target_depend_item(&nacl->acl_group.cg_item); 1428 } 1429 1430 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1431 { 1432 if (!nacl->dynamic_node_acl) 1433 target_undepend_item(&nacl->acl_group.cg_item); 1434 atomic_dec_mb(&nacl->acl_pr_ref_count); 1435 } 1436 1437 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1438 { 1439 /* 1440 * For nacl->dynamic_node_acl=1 1441 */ 1442 if (!se_deve->se_lun_acl) 1443 return 0; 1444 1445 return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1446 } 1447 1448 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1449 { 1450 /* 1451 * For nacl->dynamic_node_acl=1 1452 */ 1453 if (!se_deve->se_lun_acl) { 1454 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1455 return; 1456 } 1457 1458 target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1459 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1460 } 1461 1462 static sense_reason_t 1463 core_scsi3_decode_spec_i_port( 1464 struct se_cmd *cmd, 1465 struct se_portal_group *tpg, 1466 unsigned char *l_isid, 1467 u64 sa_res_key, 1468 int all_tg_pt, 1469 int aptpl) 1470 { 1471 struct se_device *dev = cmd->se_dev; 1472 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1473 struct se_session *se_sess = cmd->se_sess; 1474 struct se_node_acl *dest_node_acl = NULL; 1475 struct se_dev_entry *dest_se_deve = NULL; 1476 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1477 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1478 LIST_HEAD(tid_dest_list); 1479 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1480 unsigned char *buf, *ptr, proto_ident; 1481 unsigned char i_str[TRANSPORT_IQN_LEN]; 1482 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1483 sense_reason_t ret; 1484 u32 tpdl, tid_len = 0; 1485 u32 dest_rtpi = 0; 1486 bool tid_found; 1487 1488 /* 1489 * Allocate a struct pr_transport_id_holder and setup the 1490 * local_node_acl pointer and add to struct list_head tid_dest_list 1491 * for add registration processing in the loop of tid_dest_list below. 1492 */ 1493 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1494 if (!tidh_new) { 1495 pr_err("Unable to allocate tidh_new\n"); 1496 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1497 } 1498 INIT_LIST_HEAD(&tidh_new->dest_list); 1499 tidh_new->dest_tpg = tpg; 1500 tidh_new->dest_node_acl = se_sess->se_node_acl; 1501 1502 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1503 se_sess->se_node_acl, cmd->se_lun, 1504 NULL, cmd->orig_fe_lun, l_isid, 1505 sa_res_key, all_tg_pt, aptpl); 1506 if (!local_pr_reg) { 1507 kfree(tidh_new); 1508 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1509 } 1510 1511 if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) { 1512 kfree(tidh_new); 1513 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1514 target_pr_kref_release); 1515 kmem_cache_free(t10_pr_reg_cache, local_pr_reg); 1516 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1517 } 1518 1519 tidh_new->dest_pr_reg = local_pr_reg; 1520 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1521 1522 if (cmd->data_length < 28) { 1523 pr_warn("SPC-PR: Received PR OUT parameter list" 1524 " length too small: %u\n", cmd->data_length); 1525 ret = TCM_INVALID_PARAMETER_LIST; 1526 goto out; 1527 } 1528 1529 buf = transport_kmap_data_sg(cmd); 1530 if (!buf) { 1531 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1532 goto out; 1533 } 1534 1535 /* 1536 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1537 * first extract TransportID Parameter Data Length, and make sure 1538 * the value matches up to the SCSI expected data transfer length. 1539 */ 1540 tpdl = get_unaligned_be32(&buf[24]); 1541 1542 if ((tpdl + 28) != cmd->data_length) { 1543 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1544 " does not equal CDB data_length: %u\n", tpdl, 1545 cmd->data_length); 1546 ret = TCM_INVALID_PARAMETER_LIST; 1547 goto out_unmap; 1548 } 1549 /* 1550 * Start processing the received transport IDs using the 1551 * receiving I_T Nexus portal's fabric dependent methods to 1552 * obtain the SCSI Initiator Port/Device Identifiers. 1553 */ 1554 ptr = &buf[28]; 1555 1556 while (tpdl > 0) { 1557 struct se_lun *dest_lun, *tmp_lun; 1558 1559 proto_ident = (ptr[0] & 0x0f); 1560 dest_tpg = NULL; 1561 1562 spin_lock(&dev->se_port_lock); 1563 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1564 tmp_tpg = tmp_lun->lun_tpg; 1565 1566 /* 1567 * Look for the matching proto_ident provided by 1568 * the received TransportID 1569 */ 1570 if (tmp_tpg->proto_id != proto_ident) 1571 continue; 1572 dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi; 1573 1574 iport_ptr = NULL; 1575 tid_found = target_parse_pr_out_transport_id(tmp_tpg, 1576 ptr, &tid_len, &iport_ptr, i_str); 1577 if (!tid_found) 1578 continue; 1579 /* 1580 * Determine if this SCSI device server requires that 1581 * SCSI Intiatior TransportID w/ ISIDs is enforced 1582 * for fabric modules (iSCSI) requiring them. 1583 */ 1584 if (tpg->se_tpg_tfo->sess_get_initiator_sid && 1585 dev->dev_attrib.enforce_pr_isids && 1586 !iport_ptr) { 1587 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.", 1588 i_str); 1589 ret = TCM_INVALID_PARAMETER_LIST; 1590 spin_unlock(&dev->se_port_lock); 1591 goto out_unmap; 1592 } 1593 1594 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1595 spin_unlock(&dev->se_port_lock); 1596 1597 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1598 pr_err(" core_scsi3_tpg_depend_item()" 1599 " for tmp_tpg\n"); 1600 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1601 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1602 goto out_unmap; 1603 } 1604 /* 1605 * Locate the destination initiator ACL to be registered 1606 * from the decoded fabric module specific TransportID 1607 * at *i_str. 1608 */ 1609 mutex_lock(&tmp_tpg->acl_node_mutex); 1610 dest_node_acl = __core_tpg_get_initiator_node_acl( 1611 tmp_tpg, i_str); 1612 if (dest_node_acl) 1613 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1614 mutex_unlock(&tmp_tpg->acl_node_mutex); 1615 1616 if (!dest_node_acl) { 1617 core_scsi3_tpg_undepend_item(tmp_tpg); 1618 spin_lock(&dev->se_port_lock); 1619 continue; 1620 } 1621 1622 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1623 pr_err("configfs_depend_item() failed" 1624 " for dest_node_acl->acl_group\n"); 1625 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1626 core_scsi3_tpg_undepend_item(tmp_tpg); 1627 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1628 goto out_unmap; 1629 } 1630 1631 dest_tpg = tmp_tpg; 1632 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n", 1633 dest_tpg->se_tpg_tfo->fabric_name, 1634 dest_node_acl->initiatorname, dest_rtpi); 1635 1636 spin_lock(&dev->se_port_lock); 1637 break; 1638 } 1639 spin_unlock(&dev->se_port_lock); 1640 1641 if (!dest_tpg) { 1642 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1643 " dest_tpg\n"); 1644 ret = TCM_INVALID_PARAMETER_LIST; 1645 goto out_unmap; 1646 } 1647 1648 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1649 " tid_len: %d for %s + %s\n", 1650 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, 1651 tpdl, tid_len, i_str, iport_ptr); 1652 1653 if (tid_len > tpdl) { 1654 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1655 " %u for Transport ID: %s\n", tid_len, ptr); 1656 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1657 core_scsi3_tpg_undepend_item(dest_tpg); 1658 ret = TCM_INVALID_PARAMETER_LIST; 1659 goto out_unmap; 1660 } 1661 /* 1662 * Locate the desintation struct se_dev_entry pointer for matching 1663 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1664 * Target Port. 1665 */ 1666 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1667 dest_rtpi); 1668 if (!dest_se_deve) { 1669 pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n", 1670 dest_tpg->se_tpg_tfo->fabric_name, 1671 dest_rtpi); 1672 1673 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1674 core_scsi3_tpg_undepend_item(dest_tpg); 1675 ret = TCM_INVALID_PARAMETER_LIST; 1676 goto out_unmap; 1677 } 1678 1679 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1680 pr_err("core_scsi3_lunacl_depend_item()" 1681 " failed\n"); 1682 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1683 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1684 core_scsi3_tpg_undepend_item(dest_tpg); 1685 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1686 goto out_unmap; 1687 } 1688 1689 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1690 " dest_se_deve mapped_lun: %llu\n", 1691 dest_tpg->se_tpg_tfo->fabric_name, 1692 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1693 1694 /* 1695 * Skip any TransportIDs that already have a registration for 1696 * this target port. 1697 */ 1698 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1699 iport_ptr); 1700 if (pr_reg_e) { 1701 core_scsi3_put_pr_reg(pr_reg_e); 1702 core_scsi3_lunacl_undepend_item(dest_se_deve); 1703 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1704 core_scsi3_tpg_undepend_item(dest_tpg); 1705 ptr += tid_len; 1706 tpdl -= tid_len; 1707 tid_len = 0; 1708 continue; 1709 } 1710 /* 1711 * Allocate a struct pr_transport_id_holder and setup 1712 * the dest_node_acl and dest_se_deve pointers for the 1713 * loop below. 1714 */ 1715 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1716 GFP_KERNEL); 1717 if (!tidh_new) { 1718 pr_err("Unable to allocate tidh_new\n"); 1719 core_scsi3_lunacl_undepend_item(dest_se_deve); 1720 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1721 core_scsi3_tpg_undepend_item(dest_tpg); 1722 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1723 goto out_unmap; 1724 } 1725 INIT_LIST_HEAD(&tidh_new->dest_list); 1726 tidh_new->dest_tpg = dest_tpg; 1727 tidh_new->dest_node_acl = dest_node_acl; 1728 tidh_new->dest_se_deve = dest_se_deve; 1729 1730 /* 1731 * Allocate, but do NOT add the registration for the 1732 * TransportID referenced SCSI Initiator port. This 1733 * done because of the following from spc4r17 in section 1734 * 6.14.3 wrt SPEC_I_PT: 1735 * 1736 * "If a registration fails for any initiator port (e.g., if th 1737 * logical unit does not have enough resources available to 1738 * hold the registration information), no registrations shall be 1739 * made, and the command shall be terminated with 1740 * CHECK CONDITION status." 1741 * 1742 * That means we call __core_scsi3_alloc_registration() here, 1743 * and then call __core_scsi3_add_registration() in the 1744 * 2nd loop which will never fail. 1745 */ 1746 dest_lun = dest_se_deve->se_lun; 1747 1748 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1749 dest_node_acl, dest_lun, dest_se_deve, 1750 dest_se_deve->mapped_lun, iport_ptr, 1751 sa_res_key, all_tg_pt, aptpl); 1752 if (!dest_pr_reg) { 1753 core_scsi3_lunacl_undepend_item(dest_se_deve); 1754 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1755 core_scsi3_tpg_undepend_item(dest_tpg); 1756 kfree(tidh_new); 1757 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1758 goto out_unmap; 1759 } 1760 tidh_new->dest_pr_reg = dest_pr_reg; 1761 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1762 1763 ptr += tid_len; 1764 tpdl -= tid_len; 1765 tid_len = 0; 1766 1767 } 1768 1769 transport_kunmap_data_sg(cmd); 1770 1771 /* 1772 * Go ahead and create a registrations from tid_dest_list for the 1773 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1774 * and dest_se_deve. 1775 * 1776 * The SA Reservation Key from the PROUT is set for the 1777 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1778 * means that the TransportID Initiator port will be 1779 * registered on all of the target ports in the SCSI target device 1780 * ALL_TG_PT=0 means the registration will only be for the 1781 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1782 * was received. 1783 */ 1784 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1785 dest_tpg = tidh->dest_tpg; 1786 dest_node_acl = tidh->dest_node_acl; 1787 dest_se_deve = tidh->dest_se_deve; 1788 dest_pr_reg = tidh->dest_pr_reg; 1789 1790 list_del(&tidh->dest_list); 1791 kfree(tidh); 1792 1793 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1794 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1795 1796 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1797 dest_pr_reg, 0, 0); 1798 1799 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1800 " registered Transport ID for Node: %s%s Mapped LUN:" 1801 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, 1802 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1803 dest_se_deve->mapped_lun : 0); 1804 1805 if (dest_pr_reg == local_pr_reg) 1806 continue; 1807 1808 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1809 core_scsi3_tpg_undepend_item(dest_tpg); 1810 } 1811 1812 return 0; 1813 out_unmap: 1814 transport_kunmap_data_sg(cmd); 1815 out: 1816 /* 1817 * For the failure case, release everything from tid_dest_list 1818 * including *dest_pr_reg and the configfs dependances.. 1819 */ 1820 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1821 bool is_local = false; 1822 1823 dest_tpg = tidh->dest_tpg; 1824 dest_node_acl = tidh->dest_node_acl; 1825 dest_se_deve = tidh->dest_se_deve; 1826 dest_pr_reg = tidh->dest_pr_reg; 1827 1828 if (dest_pr_reg == local_pr_reg) 1829 is_local = true; 1830 1831 list_del(&tidh->dest_list); 1832 kfree(tidh); 1833 /* 1834 * Release any extra ALL_TG_PT=1 registrations for 1835 * the SPEC_I_PT=1 case. 1836 */ 1837 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1838 &dest_pr_reg->pr_reg_atp_list, 1839 pr_reg_atp_mem_list) { 1840 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1841 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1842 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1843 } 1844 1845 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1846 1847 if (dest_se_deve) 1848 core_scsi3_lunacl_undepend_item(dest_se_deve); 1849 1850 if (is_local) 1851 continue; 1852 1853 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1854 core_scsi3_tpg_undepend_item(dest_tpg); 1855 } 1856 return ret; 1857 } 1858 1859 static int core_scsi3_update_aptpl_buf( 1860 struct se_device *dev, 1861 unsigned char *buf, 1862 u32 pr_aptpl_buf_len) 1863 { 1864 struct se_portal_group *tpg; 1865 struct t10_pr_registration *pr_reg; 1866 unsigned char tmp[512], isid_buf[32]; 1867 ssize_t len = 0; 1868 int reg_count = 0; 1869 int ret = 0; 1870 1871 spin_lock(&dev->dev_reservation_lock); 1872 spin_lock(&dev->t10_pr.registration_lock); 1873 /* 1874 * Walk the registration list.. 1875 */ 1876 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1877 pr_reg_list) { 1878 1879 tmp[0] = '\0'; 1880 isid_buf[0] = '\0'; 1881 tpg = pr_reg->pr_reg_nacl->se_tpg; 1882 /* 1883 * Write out any ISID value to APTPL metadata that was included 1884 * in the original registration. 1885 */ 1886 if (pr_reg->isid_present_at_reg) 1887 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1888 pr_reg->pr_reg_isid); 1889 /* 1890 * Include special metadata if the pr_reg matches the 1891 * reservation holder. 1892 */ 1893 if (dev->dev_pr_res_holder == pr_reg) { 1894 snprintf(tmp, 512, "PR_REG_START: %d" 1895 "\ninitiator_fabric=%s\n" 1896 "initiator_node=%s\n%s" 1897 "sa_res_key=%llu\n" 1898 "res_holder=1\nres_type=%02x\n" 1899 "res_scope=%02x\nres_all_tg_pt=%d\n" 1900 "mapped_lun=%llu\n", reg_count, 1901 tpg->se_tpg_tfo->fabric_name, 1902 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1903 pr_reg->pr_res_key, pr_reg->pr_res_type, 1904 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1905 pr_reg->pr_res_mapped_lun); 1906 } else { 1907 snprintf(tmp, 512, "PR_REG_START: %d\n" 1908 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1909 "sa_res_key=%llu\nres_holder=0\n" 1910 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1911 reg_count, tpg->se_tpg_tfo->fabric_name, 1912 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1913 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1914 pr_reg->pr_res_mapped_lun); 1915 } 1916 1917 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1918 pr_err("Unable to update renaming APTPL metadata," 1919 " reallocating larger buffer\n"); 1920 ret = -EMSGSIZE; 1921 goto out; 1922 } 1923 len += sprintf(buf+len, "%s", tmp); 1924 1925 /* 1926 * Include information about the associated SCSI target port. 1927 */ 1928 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1929 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1930 " %d\n", tpg->se_tpg_tfo->fabric_name, 1931 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1932 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1933 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1934 reg_count); 1935 1936 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1937 pr_err("Unable to update renaming APTPL metadata," 1938 " reallocating larger buffer\n"); 1939 ret = -EMSGSIZE; 1940 goto out; 1941 } 1942 len += sprintf(buf+len, "%s", tmp); 1943 reg_count++; 1944 } 1945 1946 if (!reg_count) 1947 len += sprintf(buf+len, "No Registrations or Reservations"); 1948 1949 out: 1950 spin_unlock(&dev->t10_pr.registration_lock); 1951 spin_unlock(&dev->dev_reservation_lock); 1952 1953 return ret; 1954 } 1955 1956 static int __core_scsi3_write_aptpl_to_file( 1957 struct se_device *dev, 1958 unsigned char *buf) 1959 { 1960 struct t10_wwn *wwn = &dev->t10_wwn; 1961 struct file *file; 1962 int flags = O_RDWR | O_CREAT | O_TRUNC; 1963 char *path; 1964 u32 pr_aptpl_buf_len; 1965 int ret; 1966 loff_t pos = 0; 1967 1968 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1969 &wwn->unit_serial[0]); 1970 if (!path) 1971 return -ENOMEM; 1972 1973 file = filp_open(path, flags, 0600); 1974 if (IS_ERR(file)) { 1975 pr_err("filp_open(%s) for APTPL metadata" 1976 " failed\n", path); 1977 kfree(path); 1978 return PTR_ERR(file); 1979 } 1980 1981 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1982 1983 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1984 1985 if (ret < 0) 1986 pr_debug("Error writing APTPL metadata file: %s\n", path); 1987 fput(file); 1988 kfree(path); 1989 1990 return (ret < 0) ? -EIO : 0; 1991 } 1992 1993 /* 1994 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1995 * write out the updated metadata to struct file for this SCSI device. 1996 */ 1997 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1998 { 1999 unsigned char *buf; 2000 int rc, len = PR_APTPL_BUF_LEN; 2001 2002 if (!aptpl) { 2003 char *null_buf = "No Registrations or Reservations\n"; 2004 2005 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2006 dev->t10_pr.pr_aptpl_active = 0; 2007 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2008 2009 if (rc) 2010 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2011 2012 return 0; 2013 } 2014 retry: 2015 buf = vzalloc(len); 2016 if (!buf) 2017 return TCM_OUT_OF_RESOURCES; 2018 2019 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2020 if (rc < 0) { 2021 vfree(buf); 2022 len *= 2; 2023 goto retry; 2024 } 2025 2026 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2027 if (rc != 0) { 2028 pr_err("SPC-3 PR: Could not update APTPL\n"); 2029 vfree(buf); 2030 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2031 } 2032 dev->t10_pr.pr_aptpl_active = 1; 2033 vfree(buf); 2034 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2035 return 0; 2036 } 2037 2038 static sense_reason_t 2039 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2040 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2041 { 2042 struct se_session *se_sess = cmd->se_sess; 2043 struct se_device *dev = cmd->se_dev; 2044 struct se_lun *se_lun = cmd->se_lun; 2045 struct se_portal_group *se_tpg; 2046 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2047 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2048 unsigned char isid_buf[PR_REG_ISID_LEN] = { }; 2049 unsigned char *isid_ptr = NULL; 2050 sense_reason_t ret = TCM_NO_SENSE; 2051 int pr_holder = 0, type; 2052 2053 if (!se_sess || !se_lun) { 2054 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2055 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2056 } 2057 se_tpg = se_sess->se_tpg; 2058 2059 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2060 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2061 PR_REG_ISID_LEN); 2062 isid_ptr = &isid_buf[0]; 2063 } 2064 /* 2065 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2066 */ 2067 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2068 if (!pr_reg) { 2069 if (res_key) { 2070 pr_warn("SPC-3 PR: Reservation Key non-zero" 2071 " for SA REGISTER, returning CONFLICT\n"); 2072 return TCM_RESERVATION_CONFLICT; 2073 } 2074 /* 2075 * Do nothing but return GOOD status. 2076 */ 2077 if (!sa_res_key) 2078 return 0; 2079 2080 if (!spec_i_pt) { 2081 /* 2082 * Perform the Service Action REGISTER on the Initiator 2083 * Port Endpoint that the PRO was received from on the 2084 * Logical Unit of the SCSI device server. 2085 */ 2086 if (core_scsi3_alloc_registration(cmd->se_dev, 2087 se_sess->se_node_acl, cmd->se_lun, 2088 NULL, cmd->orig_fe_lun, isid_ptr, 2089 sa_res_key, all_tg_pt, aptpl, 2090 register_type, 0)) { 2091 pr_err("Unable to allocate" 2092 " struct t10_pr_registration\n"); 2093 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2094 } 2095 } else { 2096 /* 2097 * Register both the Initiator port that received 2098 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2099 * TransportID from Parameter list and loop through 2100 * fabric dependent parameter list while calling 2101 * logic from of core_scsi3_alloc_registration() for 2102 * each TransportID provided SCSI Initiator Port/Device 2103 */ 2104 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2105 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2106 if (ret != 0) 2107 return ret; 2108 } 2109 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2110 } 2111 2112 /* ok, existing registration */ 2113 2114 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2115 pr_err("SPC-3 PR REGISTER: Received" 2116 " res_key: 0x%016Lx does not match" 2117 " existing SA REGISTER res_key:" 2118 " 0x%016Lx\n", res_key, 2119 pr_reg->pr_res_key); 2120 ret = TCM_RESERVATION_CONFLICT; 2121 goto out; 2122 } 2123 2124 if (spec_i_pt) { 2125 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2126 " set on a registered nexus\n"); 2127 ret = TCM_INVALID_PARAMETER_LIST; 2128 goto out; 2129 } 2130 2131 /* 2132 * An existing ALL_TG_PT=1 registration being released 2133 * must also set ALL_TG_PT=1 in the incoming PROUT. 2134 */ 2135 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2136 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2137 " registration exists, but ALL_TG_PT=1 bit not" 2138 " present in received PROUT\n"); 2139 ret = TCM_INVALID_CDB_FIELD; 2140 goto out; 2141 } 2142 2143 /* 2144 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2145 */ 2146 if (sa_res_key) { 2147 /* 2148 * Increment PRgeneration counter for struct se_device" 2149 * upon a successful REGISTER, see spc4r17 section 6.3.2 2150 * READ_KEYS service action. 2151 */ 2152 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2153 pr_reg->pr_res_key = sa_res_key; 2154 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2155 " Key for %s to: 0x%016Lx PRgeneration:" 2156 " 0x%08x\n", cmd->se_tfo->fabric_name, 2157 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2158 pr_reg->pr_reg_nacl->initiatorname, 2159 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2160 2161 } else { 2162 /* 2163 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2164 */ 2165 type = pr_reg->pr_res_type; 2166 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2167 pr_reg); 2168 if (pr_holder < 0) { 2169 ret = TCM_RESERVATION_CONFLICT; 2170 goto out; 2171 } 2172 2173 spin_lock(&pr_tmpl->registration_lock); 2174 /* 2175 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2176 * and matching pr_res_key. 2177 */ 2178 if (pr_reg->pr_reg_all_tg_pt) { 2179 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2180 &pr_tmpl->registration_list, 2181 pr_reg_list) { 2182 2183 if (!pr_reg_p->pr_reg_all_tg_pt) 2184 continue; 2185 if (pr_reg_p->pr_res_key != res_key) 2186 continue; 2187 if (pr_reg == pr_reg_p) 2188 continue; 2189 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2190 pr_reg_p->pr_reg_nacl->initiatorname)) 2191 continue; 2192 2193 __core_scsi3_free_registration(dev, 2194 pr_reg_p, NULL, 0); 2195 } 2196 } 2197 2198 /* 2199 * Release the calling I_T Nexus registration now.. 2200 */ 2201 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2202 pr_reg = NULL; 2203 2204 /* 2205 * From spc4r17, section 5.7.11.3 Unregistering 2206 * 2207 * If the persistent reservation is a registrants only 2208 * type, the device server shall establish a unit 2209 * attention condition for the initiator port associated 2210 * with every registered I_T nexus except for the I_T 2211 * nexus on which the PERSISTENT RESERVE OUT command was 2212 * received, with the additional sense code set to 2213 * RESERVATIONS RELEASED. 2214 */ 2215 if (pr_holder && 2216 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2217 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2218 list_for_each_entry(pr_reg_p, 2219 &pr_tmpl->registration_list, 2220 pr_reg_list) { 2221 2222 target_ua_allocate_lun( 2223 pr_reg_p->pr_reg_nacl, 2224 pr_reg_p->pr_res_mapped_lun, 2225 0x2A, 2226 ASCQ_2AH_RESERVATIONS_RELEASED); 2227 } 2228 } 2229 2230 spin_unlock(&pr_tmpl->registration_lock); 2231 } 2232 2233 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2234 2235 out: 2236 if (pr_reg) 2237 core_scsi3_put_pr_reg(pr_reg); 2238 return ret; 2239 } 2240 2241 unsigned char *core_scsi3_pr_dump_type(int type) 2242 { 2243 switch (type) { 2244 case PR_TYPE_WRITE_EXCLUSIVE: 2245 return "Write Exclusive Access"; 2246 case PR_TYPE_EXCLUSIVE_ACCESS: 2247 return "Exclusive Access"; 2248 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2249 return "Write Exclusive Access, Registrants Only"; 2250 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2251 return "Exclusive Access, Registrants Only"; 2252 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2253 return "Write Exclusive Access, All Registrants"; 2254 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2255 return "Exclusive Access, All Registrants"; 2256 default: 2257 break; 2258 } 2259 2260 return "Unknown SPC-3 PR Type"; 2261 } 2262 2263 static sense_reason_t 2264 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2265 { 2266 struct se_device *dev = cmd->se_dev; 2267 struct se_session *se_sess = cmd->se_sess; 2268 struct se_lun *se_lun = cmd->se_lun; 2269 struct t10_pr_registration *pr_reg, *pr_res_holder; 2270 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2271 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2272 sense_reason_t ret; 2273 2274 if (!se_sess || !se_lun) { 2275 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2276 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2277 } 2278 /* 2279 * Locate the existing *pr_reg via struct se_node_acl pointers 2280 */ 2281 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2282 se_sess); 2283 if (!pr_reg) { 2284 pr_err("SPC-3 PR: Unable to locate" 2285 " PR_REGISTERED *pr_reg for RESERVE\n"); 2286 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2287 } 2288 /* 2289 * From spc4r17 Section 5.7.9: Reserving: 2290 * 2291 * An application client creates a persistent reservation by issuing 2292 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2293 * a registered I_T nexus with the following parameters: 2294 * a) RESERVATION KEY set to the value of the reservation key that is 2295 * registered with the logical unit for the I_T nexus; and 2296 */ 2297 if (res_key != pr_reg->pr_res_key) { 2298 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2299 " does not match existing SA REGISTER res_key:" 2300 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2301 ret = TCM_RESERVATION_CONFLICT; 2302 goto out_put_pr_reg; 2303 } 2304 /* 2305 * From spc4r17 Section 5.7.9: Reserving: 2306 * 2307 * From above: 2308 * b) TYPE field and SCOPE field set to the persistent reservation 2309 * being created. 2310 * 2311 * Only one persistent reservation is allowed at a time per logical unit 2312 * and that persistent reservation has a scope of LU_SCOPE. 2313 */ 2314 if (scope != PR_SCOPE_LU_SCOPE) { 2315 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2316 ret = TCM_INVALID_PARAMETER_LIST; 2317 goto out_put_pr_reg; 2318 } 2319 /* 2320 * See if we have an existing PR reservation holder pointer at 2321 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2322 * *pr_res_holder. 2323 */ 2324 spin_lock(&dev->dev_reservation_lock); 2325 pr_res_holder = dev->dev_pr_res_holder; 2326 if (pr_res_holder) { 2327 /* 2328 * From spc4r17 Section 5.7.9: Reserving: 2329 * 2330 * If the device server receives a PERSISTENT RESERVE OUT 2331 * command from an I_T nexus other than a persistent reservation 2332 * holder (see 5.7.10) that attempts to create a persistent 2333 * reservation when a persistent reservation already exists for 2334 * the logical unit, then the command shall be completed with 2335 * RESERVATION CONFLICT status. 2336 */ 2337 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2338 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2339 pr_err("SPC-3 PR: Attempted RESERVE from" 2340 " [%s]: %s while reservation already held by" 2341 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2342 cmd->se_tfo->fabric_name, 2343 se_sess->se_node_acl->initiatorname, 2344 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2345 pr_res_holder->pr_reg_nacl->initiatorname); 2346 2347 spin_unlock(&dev->dev_reservation_lock); 2348 ret = TCM_RESERVATION_CONFLICT; 2349 goto out_put_pr_reg; 2350 } 2351 /* 2352 * From spc4r17 Section 5.7.9: Reserving: 2353 * 2354 * If a persistent reservation holder attempts to modify the 2355 * type or scope of an existing persistent reservation, the 2356 * command shall be completed with RESERVATION CONFLICT status. 2357 */ 2358 if ((pr_res_holder->pr_res_type != type) || 2359 (pr_res_holder->pr_res_scope != scope)) { 2360 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2361 pr_err("SPC-3 PR: Attempted RESERVE from" 2362 " [%s]: %s trying to change TYPE and/or SCOPE," 2363 " while reservation already held by [%s]: %s," 2364 " returning RESERVATION_CONFLICT\n", 2365 cmd->se_tfo->fabric_name, 2366 se_sess->se_node_acl->initiatorname, 2367 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2368 pr_res_holder->pr_reg_nacl->initiatorname); 2369 2370 spin_unlock(&dev->dev_reservation_lock); 2371 ret = TCM_RESERVATION_CONFLICT; 2372 goto out_put_pr_reg; 2373 } 2374 /* 2375 * From spc4r17 Section 5.7.9: Reserving: 2376 * 2377 * If the device server receives a PERSISTENT RESERVE OUT 2378 * command with RESERVE service action where the TYPE field and 2379 * the SCOPE field contain the same values as the existing type 2380 * and scope from a persistent reservation holder, it shall not 2381 * make any change to the existing persistent reservation and 2382 * shall completethe command with GOOD status. 2383 */ 2384 spin_unlock(&dev->dev_reservation_lock); 2385 ret = 0; 2386 goto out_put_pr_reg; 2387 } 2388 /* 2389 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2390 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2391 */ 2392 pr_reg->pr_res_scope = scope; 2393 pr_reg->pr_res_type = type; 2394 pr_reg->pr_res_holder = 1; 2395 dev->dev_pr_res_holder = pr_reg; 2396 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2397 2398 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2399 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2400 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), 2401 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2402 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2403 cmd->se_tfo->fabric_name, 2404 se_sess->se_node_acl->initiatorname, 2405 i_buf); 2406 spin_unlock(&dev->dev_reservation_lock); 2407 2408 if (pr_tmpl->pr_aptpl_active) 2409 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2410 2411 ret = 0; 2412 out_put_pr_reg: 2413 core_scsi3_put_pr_reg(pr_reg); 2414 return ret; 2415 } 2416 2417 static sense_reason_t 2418 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2419 u64 res_key) 2420 { 2421 switch (type) { 2422 case PR_TYPE_WRITE_EXCLUSIVE: 2423 case PR_TYPE_EXCLUSIVE_ACCESS: 2424 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2425 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2426 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2427 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2428 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2429 default: 2430 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2431 " 0x%02x\n", type); 2432 return TCM_INVALID_CDB_FIELD; 2433 } 2434 } 2435 2436 static void __core_scsi3_complete_pro_release( 2437 struct se_device *dev, 2438 struct se_node_acl *se_nacl, 2439 struct t10_pr_registration *pr_reg, 2440 int explicit, 2441 int unreg) 2442 { 2443 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2444 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2445 int pr_res_type = 0, pr_res_scope = 0; 2446 2447 lockdep_assert_held(&dev->dev_reservation_lock); 2448 2449 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2450 /* 2451 * Go ahead and release the current PR reservation holder. 2452 * If an All Registrants reservation is currently active and 2453 * a unregister operation is requested, replace the current 2454 * dev_pr_res_holder with another active registration. 2455 */ 2456 if (dev->dev_pr_res_holder) { 2457 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2458 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2459 dev->dev_pr_res_holder->pr_res_type = 0; 2460 dev->dev_pr_res_holder->pr_res_scope = 0; 2461 dev->dev_pr_res_holder->pr_res_holder = 0; 2462 dev->dev_pr_res_holder = NULL; 2463 } 2464 if (!unreg) 2465 goto out; 2466 2467 spin_lock(&dev->t10_pr.registration_lock); 2468 list_del_init(&pr_reg->pr_reg_list); 2469 /* 2470 * If the I_T nexus is a reservation holder, the persistent reservation 2471 * is of an all registrants type, and the I_T nexus is the last remaining 2472 * registered I_T nexus, then the device server shall also release the 2473 * persistent reservation. 2474 */ 2475 if (!list_empty(&dev->t10_pr.registration_list) && 2476 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2477 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2478 dev->dev_pr_res_holder = 2479 list_entry(dev->t10_pr.registration_list.next, 2480 struct t10_pr_registration, pr_reg_list); 2481 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2482 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2483 dev->dev_pr_res_holder->pr_res_holder = 1; 2484 } 2485 spin_unlock(&dev->t10_pr.registration_lock); 2486 out: 2487 if (!dev->dev_pr_res_holder) { 2488 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2489 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2490 tfo->fabric_name, (explicit) ? "explicit" : 2491 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2492 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2493 } 2494 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2495 tfo->fabric_name, se_nacl->initiatorname, 2496 i_buf); 2497 /* 2498 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2499 */ 2500 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2501 } 2502 2503 static sense_reason_t 2504 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2505 u64 res_key) 2506 { 2507 struct se_device *dev = cmd->se_dev; 2508 struct se_session *se_sess = cmd->se_sess; 2509 struct se_lun *se_lun = cmd->se_lun; 2510 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2511 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2512 sense_reason_t ret = 0; 2513 2514 if (!se_sess || !se_lun) { 2515 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2516 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2517 } 2518 /* 2519 * Locate the existing *pr_reg via struct se_node_acl pointers 2520 */ 2521 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2522 if (!pr_reg) { 2523 pr_err("SPC-3 PR: Unable to locate" 2524 " PR_REGISTERED *pr_reg for RELEASE\n"); 2525 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2526 } 2527 /* 2528 * From spc4r17 Section 5.7.11.2 Releasing: 2529 * 2530 * If there is no persistent reservation or in response to a persistent 2531 * reservation release request from a registered I_T nexus that is not a 2532 * persistent reservation holder (see 5.7.10), the device server shall 2533 * do the following: 2534 * 2535 * a) Not release the persistent reservation, if any; 2536 * b) Not remove any registrations; and 2537 * c) Complete the command with GOOD status. 2538 */ 2539 spin_lock(&dev->dev_reservation_lock); 2540 pr_res_holder = dev->dev_pr_res_holder; 2541 if (!pr_res_holder) { 2542 /* 2543 * No persistent reservation, return GOOD status. 2544 */ 2545 spin_unlock(&dev->dev_reservation_lock); 2546 goto out_put_pr_reg; 2547 } 2548 2549 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2550 /* 2551 * Release request from a registered I_T nexus that is not a 2552 * persistent reservation holder. return GOOD status. 2553 */ 2554 spin_unlock(&dev->dev_reservation_lock); 2555 goto out_put_pr_reg; 2556 } 2557 2558 /* 2559 * From spc4r17 Section 5.7.11.2 Releasing: 2560 * 2561 * Only the persistent reservation holder (see 5.7.10) is allowed to 2562 * release a persistent reservation. 2563 * 2564 * An application client releases the persistent reservation by issuing 2565 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2566 * an I_T nexus that is a persistent reservation holder with the 2567 * following parameters: 2568 * 2569 * a) RESERVATION KEY field set to the value of the reservation key 2570 * that is registered with the logical unit for the I_T nexus; 2571 */ 2572 if (res_key != pr_reg->pr_res_key) { 2573 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2574 " does not match existing SA REGISTER res_key:" 2575 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2576 spin_unlock(&dev->dev_reservation_lock); 2577 ret = TCM_RESERVATION_CONFLICT; 2578 goto out_put_pr_reg; 2579 } 2580 /* 2581 * From spc4r17 Section 5.7.11.2 Releasing and above: 2582 * 2583 * b) TYPE field and SCOPE field set to match the persistent 2584 * reservation being released. 2585 */ 2586 if ((pr_res_holder->pr_res_type != type) || 2587 (pr_res_holder->pr_res_scope != scope)) { 2588 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2589 pr_err("SPC-3 PR RELEASE: Attempted to release" 2590 " reservation from [%s]: %s with different TYPE " 2591 "and/or SCOPE while reservation already held by" 2592 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2593 cmd->se_tfo->fabric_name, 2594 se_sess->se_node_acl->initiatorname, 2595 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2596 pr_res_holder->pr_reg_nacl->initiatorname); 2597 2598 spin_unlock(&dev->dev_reservation_lock); 2599 ret = TCM_RESERVATION_CONFLICT; 2600 goto out_put_pr_reg; 2601 } 2602 /* 2603 * In response to a persistent reservation release request from the 2604 * persistent reservation holder the device server shall perform a 2605 * release by doing the following as an uninterrupted series of actions: 2606 * a) Release the persistent reservation; 2607 * b) Not remove any registration(s); 2608 * c) If the released persistent reservation is a registrants only type 2609 * or all registrants type persistent reservation, 2610 * the device server shall establish a unit attention condition for 2611 * the initiator port associated with every regis- 2612 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2613 * RESERVE OUT command with RELEASE service action was received, 2614 * with the additional sense code set to RESERVATIONS RELEASED; and 2615 * d) If the persistent reservation is of any other type, the device 2616 * server shall not establish a unit attention condition. 2617 */ 2618 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2619 pr_reg, 1, 0); 2620 2621 spin_unlock(&dev->dev_reservation_lock); 2622 2623 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2624 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2625 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2626 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2627 /* 2628 * If no UNIT ATTENTION conditions will be established for 2629 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2630 * go ahead and check for APTPL=1 update+write below 2631 */ 2632 goto write_aptpl; 2633 } 2634 2635 spin_lock(&pr_tmpl->registration_lock); 2636 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2637 pr_reg_list) { 2638 /* 2639 * Do not establish a UNIT ATTENTION condition 2640 * for the calling I_T Nexus 2641 */ 2642 if (pr_reg_p == pr_reg) 2643 continue; 2644 2645 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2646 pr_reg_p->pr_res_mapped_lun, 2647 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2648 } 2649 spin_unlock(&pr_tmpl->registration_lock); 2650 2651 write_aptpl: 2652 if (pr_tmpl->pr_aptpl_active) 2653 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2654 2655 out_put_pr_reg: 2656 core_scsi3_put_pr_reg(pr_reg); 2657 return ret; 2658 } 2659 2660 static sense_reason_t 2661 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2662 { 2663 struct se_device *dev = cmd->se_dev; 2664 struct se_node_acl *pr_reg_nacl; 2665 struct se_session *se_sess = cmd->se_sess; 2666 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2667 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2668 u64 pr_res_mapped_lun = 0; 2669 int calling_it_nexus = 0; 2670 /* 2671 * Locate the existing *pr_reg via struct se_node_acl pointers 2672 */ 2673 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2674 se_sess->se_node_acl, se_sess); 2675 if (!pr_reg_n) { 2676 pr_err("SPC-3 PR: Unable to locate" 2677 " PR_REGISTERED *pr_reg for CLEAR\n"); 2678 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2679 } 2680 /* 2681 * From spc4r17 section 5.7.11.6, Clearing: 2682 * 2683 * Any application client may release the persistent reservation and 2684 * remove all registrations from a device server by issuing a 2685 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2686 * registered I_T nexus with the following parameter: 2687 * 2688 * a) RESERVATION KEY field set to the value of the reservation key 2689 * that is registered with the logical unit for the I_T nexus. 2690 */ 2691 if (res_key != pr_reg_n->pr_res_key) { 2692 pr_err("SPC-3 PR REGISTER: Received" 2693 " res_key: 0x%016Lx does not match" 2694 " existing SA REGISTER res_key:" 2695 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2696 core_scsi3_put_pr_reg(pr_reg_n); 2697 return TCM_RESERVATION_CONFLICT; 2698 } 2699 /* 2700 * a) Release the persistent reservation, if any; 2701 */ 2702 spin_lock(&dev->dev_reservation_lock); 2703 pr_res_holder = dev->dev_pr_res_holder; 2704 if (pr_res_holder) { 2705 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2706 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2707 pr_res_holder, 0, 0); 2708 } 2709 spin_unlock(&dev->dev_reservation_lock); 2710 /* 2711 * b) Remove all registration(s) (see spc4r17 5.7.7); 2712 */ 2713 spin_lock(&pr_tmpl->registration_lock); 2714 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2715 &pr_tmpl->registration_list, pr_reg_list) { 2716 2717 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2718 pr_reg_nacl = pr_reg->pr_reg_nacl; 2719 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2720 __core_scsi3_free_registration(dev, pr_reg, NULL, 2721 calling_it_nexus); 2722 /* 2723 * e) Establish a unit attention condition for the initiator 2724 * port associated with every registered I_T nexus other 2725 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2726 * command with CLEAR service action was received, with the 2727 * additional sense code set to RESERVATIONS PREEMPTED. 2728 */ 2729 if (!calling_it_nexus) 2730 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2731 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2732 } 2733 spin_unlock(&pr_tmpl->registration_lock); 2734 2735 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2736 cmd->se_tfo->fabric_name); 2737 2738 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2739 2740 core_scsi3_pr_generation(dev); 2741 return 0; 2742 } 2743 2744 static void __core_scsi3_complete_pro_preempt( 2745 struct se_device *dev, 2746 struct t10_pr_registration *pr_reg, 2747 struct list_head *preempt_and_abort_list, 2748 int type, 2749 int scope, 2750 enum preempt_type preempt_type) 2751 { 2752 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2753 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2754 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2755 2756 lockdep_assert_held(&dev->dev_reservation_lock); 2757 2758 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2759 /* 2760 * Do an implicit RELEASE of the existing reservation. 2761 */ 2762 if (dev->dev_pr_res_holder) 2763 __core_scsi3_complete_pro_release(dev, nacl, 2764 dev->dev_pr_res_holder, 0, 0); 2765 2766 dev->dev_pr_res_holder = pr_reg; 2767 pr_reg->pr_res_holder = 1; 2768 pr_reg->pr_res_type = type; 2769 pr_reg->pr_res_scope = scope; 2770 2771 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2772 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2773 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2774 core_scsi3_pr_dump_type(type), 2775 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2776 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2777 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2778 nacl->initiatorname, i_buf); 2779 /* 2780 * For PREEMPT_AND_ABORT, add the preempting reservation's 2781 * struct t10_pr_registration to the list that will be compared 2782 * against received CDBs.. 2783 */ 2784 if (preempt_and_abort_list) 2785 list_add_tail(&pr_reg->pr_reg_abort_list, 2786 preempt_and_abort_list); 2787 } 2788 2789 static void core_scsi3_release_preempt_and_abort( 2790 struct list_head *preempt_and_abort_list, 2791 struct t10_pr_registration *pr_reg_holder) 2792 { 2793 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2794 2795 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2796 pr_reg_abort_list) { 2797 2798 list_del(&pr_reg->pr_reg_abort_list); 2799 if (pr_reg_holder == pr_reg) 2800 continue; 2801 if (pr_reg->pr_res_holder) { 2802 pr_warn("pr_reg->pr_res_holder still set\n"); 2803 continue; 2804 } 2805 2806 pr_reg->pr_reg_deve = NULL; 2807 pr_reg->pr_reg_nacl = NULL; 2808 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2809 } 2810 } 2811 2812 static sense_reason_t 2813 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2814 u64 sa_res_key, enum preempt_type preempt_type) 2815 { 2816 struct se_device *dev = cmd->se_dev; 2817 struct se_node_acl *pr_reg_nacl; 2818 struct se_session *se_sess = cmd->se_sess; 2819 LIST_HEAD(preempt_and_abort_list); 2820 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2821 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2822 u64 pr_res_mapped_lun = 0; 2823 int all_reg = 0, calling_it_nexus = 0; 2824 bool sa_res_key_unmatched = sa_res_key != 0; 2825 int prh_type = 0, prh_scope = 0; 2826 2827 if (!se_sess) 2828 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2829 2830 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2831 se_sess); 2832 if (!pr_reg_n) { 2833 pr_err("SPC-3 PR: Unable to locate" 2834 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2835 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2836 return TCM_RESERVATION_CONFLICT; 2837 } 2838 if (pr_reg_n->pr_res_key != res_key) { 2839 core_scsi3_put_pr_reg(pr_reg_n); 2840 return TCM_RESERVATION_CONFLICT; 2841 } 2842 if (scope != PR_SCOPE_LU_SCOPE) { 2843 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2844 core_scsi3_put_pr_reg(pr_reg_n); 2845 return TCM_INVALID_PARAMETER_LIST; 2846 } 2847 2848 spin_lock(&dev->dev_reservation_lock); 2849 pr_res_holder = dev->dev_pr_res_holder; 2850 if (pr_res_holder && 2851 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2852 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2853 all_reg = 1; 2854 2855 if (!all_reg && !sa_res_key) { 2856 spin_unlock(&dev->dev_reservation_lock); 2857 core_scsi3_put_pr_reg(pr_reg_n); 2858 return TCM_INVALID_PARAMETER_LIST; 2859 } 2860 /* 2861 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2862 * 2863 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2864 * persistent reservation holder or there is no persistent reservation 2865 * holder (i.e., there is no persistent reservation), then the device 2866 * server shall perform a preempt by doing the following in an 2867 * uninterrupted series of actions. (See below..) 2868 */ 2869 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2870 /* 2871 * No existing or SA Reservation Key matching reservations.. 2872 * 2873 * PROUT SA PREEMPT with All Registrant type reservations are 2874 * allowed to be processed without a matching SA Reservation Key 2875 */ 2876 spin_lock(&pr_tmpl->registration_lock); 2877 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2878 &pr_tmpl->registration_list, pr_reg_list) { 2879 /* 2880 * Removing of registrations in non all registrants 2881 * type reservations without a matching SA reservation 2882 * key. 2883 * 2884 * a) Remove the registrations for all I_T nexuses 2885 * specified by the SERVICE ACTION RESERVATION KEY 2886 * field; 2887 * b) Ignore the contents of the SCOPE and TYPE fields; 2888 * c) Process tasks as defined in 5.7.1; and 2889 * d) Establish a unit attention condition for the 2890 * initiator port associated with every I_T nexus 2891 * that lost its registration other than the I_T 2892 * nexus on which the PERSISTENT RESERVE OUT command 2893 * was received, with the additional sense code set 2894 * to REGISTRATIONS PREEMPTED. 2895 */ 2896 if (!all_reg) { 2897 if (pr_reg->pr_res_key != sa_res_key) 2898 continue; 2899 sa_res_key_unmatched = false; 2900 2901 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2902 pr_reg_nacl = pr_reg->pr_reg_nacl; 2903 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2904 __core_scsi3_free_registration(dev, pr_reg, 2905 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2906 NULL, calling_it_nexus); 2907 } else { 2908 /* 2909 * Case for any existing all registrants type 2910 * reservation, follow logic in spc4r17 section 2911 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2912 * 2913 * For a ZERO SA Reservation key, release 2914 * all other registrations and do an implicit 2915 * release of active persistent reservation. 2916 * 2917 * For a non-ZERO SA Reservation key, only 2918 * release the matching reservation key from 2919 * registrations. 2920 */ 2921 if ((sa_res_key) && 2922 (pr_reg->pr_res_key != sa_res_key)) 2923 continue; 2924 sa_res_key_unmatched = false; 2925 2926 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2927 if (calling_it_nexus) 2928 continue; 2929 2930 pr_reg_nacl = pr_reg->pr_reg_nacl; 2931 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2932 __core_scsi3_free_registration(dev, pr_reg, 2933 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2934 NULL, 0); 2935 } 2936 if (!calling_it_nexus) 2937 target_ua_allocate_lun(pr_reg_nacl, 2938 pr_res_mapped_lun, 0x2A, 2939 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2940 } 2941 spin_unlock(&pr_tmpl->registration_lock); 2942 /* 2943 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2944 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2945 * RESERVATION KEY field to a value that does not match any 2946 * registered reservation key, then the device server shall 2947 * complete the command with RESERVATION CONFLICT status. 2948 */ 2949 if (sa_res_key_unmatched) { 2950 spin_unlock(&dev->dev_reservation_lock); 2951 core_scsi3_put_pr_reg(pr_reg_n); 2952 return TCM_RESERVATION_CONFLICT; 2953 } 2954 /* 2955 * For an existing all registrants type reservation 2956 * with a zero SA rservation key, preempt the existing 2957 * reservation with the new PR type and scope. 2958 */ 2959 if (pr_res_holder && all_reg && !(sa_res_key)) { 2960 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2961 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2962 type, scope, preempt_type); 2963 } 2964 2965 spin_unlock(&dev->dev_reservation_lock); 2966 2967 /* 2968 * SPC-4 5.12.11.2.6 Preempting and aborting 2969 * The actions described in this subclause shall be performed 2970 * for all I_T nexuses that are registered with the non-zero 2971 * SERVICE ACTION RESERVATION KEY value, without regard for 2972 * whether the preempted I_T nexuses hold the persistent 2973 * reservation. If the SERVICE ACTION RESERVATION KEY field is 2974 * set to zero and an all registrants persistent reservation is 2975 * present, the device server shall abort all commands for all 2976 * registered I_T nexuses. 2977 */ 2978 if (preempt_type == PREEMPT_AND_ABORT) { 2979 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, 2980 cmd); 2981 core_scsi3_release_preempt_and_abort( 2982 &preempt_and_abort_list, pr_reg_n); 2983 } 2984 2985 if (pr_tmpl->pr_aptpl_active) 2986 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2987 2988 core_scsi3_put_pr_reg(pr_reg_n); 2989 core_scsi3_pr_generation(cmd->se_dev); 2990 return 0; 2991 } 2992 /* 2993 * The PREEMPTing SA reservation key matches that of the 2994 * existing persistent reservation, first, we check if 2995 * we are preempting our own reservation. 2996 * From spc4r17, section 5.7.11.4.3 Preempting 2997 * persistent reservations and registration handling 2998 * 2999 * If an all registrants persistent reservation is not 3000 * present, it is not an error for the persistent 3001 * reservation holder to preempt itself (i.e., a 3002 * PERSISTENT RESERVE OUT with a PREEMPT service action 3003 * or a PREEMPT AND ABORT service action with the 3004 * SERVICE ACTION RESERVATION KEY value equal to the 3005 * persistent reservation holder's reservation key that 3006 * is received from the persistent reservation holder). 3007 * In that case, the device server shall establish the 3008 * new persistent reservation and maintain the 3009 * registration. 3010 */ 3011 prh_type = pr_res_holder->pr_res_type; 3012 prh_scope = pr_res_holder->pr_res_scope; 3013 /* 3014 * If the SERVICE ACTION RESERVATION KEY field identifies a 3015 * persistent reservation holder (see 5.7.10), the device 3016 * server shall perform a preempt by doing the following as 3017 * an uninterrupted series of actions: 3018 * 3019 * a) Release the persistent reservation for the holder 3020 * identified by the SERVICE ACTION RESERVATION KEY field; 3021 */ 3022 if (pr_reg_n != pr_res_holder) 3023 __core_scsi3_complete_pro_release(dev, 3024 pr_res_holder->pr_reg_nacl, 3025 dev->dev_pr_res_holder, 0, 0); 3026 /* 3027 * b) Remove the registrations for all I_T nexuses identified 3028 * by the SERVICE ACTION RESERVATION KEY field, except the 3029 * I_T nexus that is being used for the PERSISTENT RESERVE 3030 * OUT command. If an all registrants persistent reservation 3031 * is present and the SERVICE ACTION RESERVATION KEY field 3032 * is set to zero, then all registrations shall be removed 3033 * except for that of the I_T nexus that is being used for 3034 * the PERSISTENT RESERVE OUT command; 3035 */ 3036 spin_lock(&pr_tmpl->registration_lock); 3037 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3038 &pr_tmpl->registration_list, pr_reg_list) { 3039 3040 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3041 if (calling_it_nexus) 3042 continue; 3043 3044 if (sa_res_key && pr_reg->pr_res_key != sa_res_key) 3045 continue; 3046 3047 pr_reg_nacl = pr_reg->pr_reg_nacl; 3048 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3049 __core_scsi3_free_registration(dev, pr_reg, 3050 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3051 calling_it_nexus); 3052 /* 3053 * e) Establish a unit attention condition for the initiator 3054 * port associated with every I_T nexus that lost its 3055 * persistent reservation and/or registration, with the 3056 * additional sense code set to REGISTRATIONS PREEMPTED; 3057 */ 3058 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3059 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3060 } 3061 spin_unlock(&pr_tmpl->registration_lock); 3062 /* 3063 * c) Establish a persistent reservation for the preempting 3064 * I_T nexus using the contents of the SCOPE and TYPE fields; 3065 */ 3066 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3067 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3068 type, scope, preempt_type); 3069 /* 3070 * d) Process tasks as defined in 5.7.1; 3071 * e) See above.. 3072 * f) If the type or scope has changed, then for every I_T nexus 3073 * whose reservation key was not removed, except for the I_T 3074 * nexus on which the PERSISTENT RESERVE OUT command was 3075 * received, the device server shall establish a unit 3076 * attention condition for the initiator port associated with 3077 * that I_T nexus, with the additional sense code set to 3078 * RESERVATIONS RELEASED. If the type or scope have not 3079 * changed, then no unit attention condition(s) shall be 3080 * established for this reason. 3081 */ 3082 if ((prh_type != type) || (prh_scope != scope)) { 3083 spin_lock(&pr_tmpl->registration_lock); 3084 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3085 &pr_tmpl->registration_list, pr_reg_list) { 3086 3087 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3088 if (calling_it_nexus) 3089 continue; 3090 3091 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3092 pr_reg->pr_res_mapped_lun, 0x2A, 3093 ASCQ_2AH_RESERVATIONS_RELEASED); 3094 } 3095 spin_unlock(&pr_tmpl->registration_lock); 3096 } 3097 spin_unlock(&dev->dev_reservation_lock); 3098 /* 3099 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3100 * All received CDBs for the matching existing reservation and 3101 * registrations undergo ABORT_TASK logic. 3102 * 3103 * From there, core_scsi3_release_preempt_and_abort() will 3104 * release every registration in the list (which have already 3105 * been removed from the primary pr_reg list), except the 3106 * new persistent reservation holder, the calling Initiator Port. 3107 */ 3108 if (preempt_type == PREEMPT_AND_ABORT) { 3109 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3110 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3111 pr_reg_n); 3112 } 3113 3114 if (pr_tmpl->pr_aptpl_active) 3115 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3116 3117 core_scsi3_put_pr_reg(pr_reg_n); 3118 core_scsi3_pr_generation(cmd->se_dev); 3119 return 0; 3120 } 3121 3122 static sense_reason_t 3123 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3124 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3125 { 3126 switch (type) { 3127 case PR_TYPE_WRITE_EXCLUSIVE: 3128 case PR_TYPE_EXCLUSIVE_ACCESS: 3129 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3130 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3131 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3132 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3133 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3134 sa_res_key, preempt_type); 3135 default: 3136 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3137 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3138 return TCM_INVALID_CDB_FIELD; 3139 } 3140 } 3141 3142 3143 static sense_reason_t 3144 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3145 u64 sa_res_key, int aptpl, int unreg) 3146 { 3147 struct se_session *se_sess = cmd->se_sess; 3148 struct se_device *dev = cmd->se_dev; 3149 struct se_dev_entry *dest_se_deve = NULL; 3150 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3151 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3152 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3153 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3154 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3155 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3156 unsigned char *buf; 3157 unsigned char initiator_str[TRANSPORT_IQN_LEN]; 3158 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { }; 3159 u32 tid_len, tmp_tid_len; 3160 int new_reg = 0, type, scope, matching_iname; 3161 sense_reason_t ret; 3162 unsigned short rtpi; 3163 unsigned char proto_ident; 3164 bool tid_found; 3165 3166 if (!se_sess || !se_lun) { 3167 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3168 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3169 } 3170 3171 se_tpg = se_sess->se_tpg; 3172 tf_ops = se_tpg->se_tpg_tfo; 3173 /* 3174 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3175 * Register behaviors for a REGISTER AND MOVE service action 3176 * 3177 * Locate the existing *pr_reg via struct se_node_acl pointers 3178 */ 3179 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3180 se_sess); 3181 if (!pr_reg) { 3182 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3183 " *pr_reg for REGISTER_AND_MOVE\n"); 3184 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3185 } 3186 /* 3187 * The provided reservation key much match the existing reservation key 3188 * provided during this initiator's I_T nexus registration. 3189 */ 3190 if (res_key != pr_reg->pr_res_key) { 3191 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3192 " res_key: 0x%016Lx does not match existing SA REGISTER" 3193 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3194 ret = TCM_RESERVATION_CONFLICT; 3195 goto out_put_pr_reg; 3196 } 3197 /* 3198 * The service active reservation key needs to be non zero 3199 */ 3200 if (!sa_res_key) { 3201 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3202 " sa_res_key\n"); 3203 ret = TCM_INVALID_PARAMETER_LIST; 3204 goto out_put_pr_reg; 3205 } 3206 3207 /* 3208 * Determine the Relative Target Port Identifier where the reservation 3209 * will be moved to for the TransportID containing SCSI initiator WWN 3210 * information. 3211 */ 3212 buf = transport_kmap_data_sg(cmd); 3213 if (!buf) { 3214 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3215 goto out_put_pr_reg; 3216 } 3217 3218 rtpi = get_unaligned_be16(&buf[18]); 3219 tid_len = get_unaligned_be32(&buf[20]); 3220 transport_kunmap_data_sg(cmd); 3221 buf = NULL; 3222 3223 if ((tid_len + 24) != cmd->data_length) { 3224 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3225 " does not equal CDB data_length: %u\n", tid_len, 3226 cmd->data_length); 3227 ret = TCM_INVALID_PARAMETER_LIST; 3228 goto out_put_pr_reg; 3229 } 3230 3231 spin_lock(&dev->se_port_lock); 3232 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3233 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi) 3234 continue; 3235 dest_se_tpg = tmp_lun->lun_tpg; 3236 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3237 if (!dest_tf_ops) 3238 continue; 3239 3240 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3241 spin_unlock(&dev->se_port_lock); 3242 3243 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3244 pr_err("core_scsi3_tpg_depend_item() failed" 3245 " for dest_se_tpg\n"); 3246 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3247 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3248 goto out_put_pr_reg; 3249 } 3250 3251 spin_lock(&dev->se_port_lock); 3252 break; 3253 } 3254 spin_unlock(&dev->se_port_lock); 3255 3256 if (!dest_se_tpg || !dest_tf_ops) { 3257 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3258 " fabric ops from Relative Target Port Identifier:" 3259 " %hu\n", rtpi); 3260 ret = TCM_INVALID_PARAMETER_LIST; 3261 goto out_put_pr_reg; 3262 } 3263 3264 buf = transport_kmap_data_sg(cmd); 3265 if (!buf) { 3266 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3267 goto out_put_pr_reg; 3268 } 3269 proto_ident = (buf[24] & 0x0f); 3270 3271 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3272 " 0x%02x\n", proto_ident); 3273 3274 if (proto_ident != dest_se_tpg->proto_id) { 3275 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3276 " proto_ident: 0x%02x does not match ident: 0x%02x" 3277 " from fabric: %s\n", proto_ident, 3278 dest_se_tpg->proto_id, 3279 dest_tf_ops->fabric_name); 3280 ret = TCM_INVALID_PARAMETER_LIST; 3281 goto out; 3282 } 3283 tid_found = target_parse_pr_out_transport_id(dest_se_tpg, 3284 &buf[24], &tmp_tid_len, &iport_ptr, initiator_str); 3285 if (!tid_found) { 3286 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3287 " initiator_str from Transport ID\n"); 3288 ret = TCM_INVALID_PARAMETER_LIST; 3289 goto out; 3290 } 3291 3292 transport_kunmap_data_sg(cmd); 3293 buf = NULL; 3294 3295 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3296 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? 3297 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3298 iport_ptr : ""); 3299 /* 3300 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3301 * action specifies a TransportID that is the same as the initiator port 3302 * of the I_T nexus for the command received, then the command shall 3303 * be terminated with CHECK CONDITION status, with the sense key set to 3304 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3305 * IN PARAMETER LIST. 3306 */ 3307 pr_reg_nacl = pr_reg->pr_reg_nacl; 3308 matching_iname = (!strcmp(initiator_str, 3309 pr_reg_nacl->initiatorname)) ? 1 : 0; 3310 if (!matching_iname) 3311 goto after_iport_check; 3312 3313 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3314 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3315 " matches: %s on received I_T Nexus\n", initiator_str, 3316 pr_reg_nacl->initiatorname); 3317 ret = TCM_INVALID_PARAMETER_LIST; 3318 goto out; 3319 } 3320 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3321 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3322 " matches: %s %s on received I_T Nexus\n", 3323 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3324 pr_reg->pr_reg_isid); 3325 ret = TCM_INVALID_PARAMETER_LIST; 3326 goto out; 3327 } 3328 after_iport_check: 3329 /* 3330 * Locate the destination struct se_node_acl from the received Transport ID 3331 */ 3332 mutex_lock(&dest_se_tpg->acl_node_mutex); 3333 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3334 initiator_str); 3335 if (dest_node_acl) 3336 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3337 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3338 3339 if (!dest_node_acl) { 3340 pr_err("Unable to locate %s dest_node_acl for" 3341 " TransportID%s\n", dest_tf_ops->fabric_name, 3342 initiator_str); 3343 ret = TCM_INVALID_PARAMETER_LIST; 3344 goto out; 3345 } 3346 3347 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3348 pr_err("core_scsi3_nodeacl_depend_item() for" 3349 " dest_node_acl\n"); 3350 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3351 dest_node_acl = NULL; 3352 ret = TCM_INVALID_PARAMETER_LIST; 3353 goto out; 3354 } 3355 3356 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3357 " %s from TransportID\n", dest_tf_ops->fabric_name, 3358 dest_node_acl->initiatorname); 3359 3360 /* 3361 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3362 * PORT IDENTIFIER. 3363 */ 3364 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3365 if (!dest_se_deve) { 3366 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3367 " %hu\n", dest_tf_ops->fabric_name, rtpi); 3368 ret = TCM_INVALID_PARAMETER_LIST; 3369 goto out; 3370 } 3371 3372 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3373 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3374 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3375 dest_se_deve = NULL; 3376 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3377 goto out; 3378 } 3379 3380 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3381 " ACL for dest_se_deve->mapped_lun: %llu\n", 3382 dest_tf_ops->fabric_name, dest_node_acl->initiatorname, 3383 dest_se_deve->mapped_lun); 3384 3385 /* 3386 * A persistent reservation needs to already existing in order to 3387 * successfully complete the REGISTER_AND_MOVE service action.. 3388 */ 3389 spin_lock(&dev->dev_reservation_lock); 3390 pr_res_holder = dev->dev_pr_res_holder; 3391 if (!pr_res_holder) { 3392 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3393 " currently held\n"); 3394 spin_unlock(&dev->dev_reservation_lock); 3395 ret = TCM_INVALID_CDB_FIELD; 3396 goto out; 3397 } 3398 /* 3399 * The received on I_T Nexus must be the reservation holder. 3400 * 3401 * From spc4r17 section 5.7.8 Table 50 -- 3402 * Register behaviors for a REGISTER AND MOVE service action 3403 */ 3404 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3405 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3406 " Nexus is not reservation holder\n"); 3407 spin_unlock(&dev->dev_reservation_lock); 3408 ret = TCM_RESERVATION_CONFLICT; 3409 goto out; 3410 } 3411 /* 3412 * From spc4r17 section 5.7.8: registering and moving reservation 3413 * 3414 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3415 * action is received and the established persistent reservation is a 3416 * Write Exclusive - All Registrants type or Exclusive Access - 3417 * All Registrants type reservation, then the command shall be completed 3418 * with RESERVATION CONFLICT status. 3419 */ 3420 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3421 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3422 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3423 " reservation for type: %s\n", 3424 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3425 spin_unlock(&dev->dev_reservation_lock); 3426 ret = TCM_RESERVATION_CONFLICT; 3427 goto out; 3428 } 3429 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3430 /* 3431 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3432 */ 3433 type = pr_res_holder->pr_res_type; 3434 scope = pr_res_holder->pr_res_type; 3435 /* 3436 * c) Associate the reservation key specified in the SERVICE ACTION 3437 * RESERVATION KEY field with the I_T nexus specified as the 3438 * destination of the register and move, where: 3439 * A) The I_T nexus is specified by the TransportID and the 3440 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3441 * B) Regardless of the TransportID format used, the association for 3442 * the initiator port is based on either the initiator port name 3443 * (see 3.1.71) on SCSI transport protocols where port names are 3444 * required or the initiator port identifier (see 3.1.70) on SCSI 3445 * transport protocols where port names are not required; 3446 * d) Register the reservation key specified in the SERVICE ACTION 3447 * RESERVATION KEY field; 3448 * 3449 * Also, It is not an error for a REGISTER AND MOVE service action to 3450 * register an I_T nexus that is already registered with the same 3451 * reservation key or a different reservation key. 3452 */ 3453 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3454 iport_ptr); 3455 if (!dest_pr_reg) { 3456 struct se_lun *dest_lun = dest_se_deve->se_lun; 3457 3458 spin_unlock(&dev->dev_reservation_lock); 3459 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3460 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3461 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3462 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3463 goto out; 3464 } 3465 spin_lock(&dev->dev_reservation_lock); 3466 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3467 iport_ptr); 3468 new_reg = 1; 3469 } else { 3470 /* 3471 * e) Retain the reservation key specified in the SERVICE ACTION 3472 * RESERVATION KEY field and associated information; 3473 */ 3474 dest_pr_reg->pr_res_key = sa_res_key; 3475 } 3476 /* 3477 * f) Release the persistent reservation for the persistent reservation 3478 * holder (i.e., the I_T nexus on which the 3479 */ 3480 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3481 dev->dev_pr_res_holder, 0, 0); 3482 /* 3483 * g) Move the persistent reservation to the specified I_T nexus using 3484 * the same scope and type as the persistent reservation released in 3485 * item f); and 3486 */ 3487 dev->dev_pr_res_holder = dest_pr_reg; 3488 dest_pr_reg->pr_res_holder = 1; 3489 dest_pr_reg->pr_res_type = type; 3490 pr_reg->pr_res_scope = scope; 3491 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3492 /* 3493 * Increment PRGeneration for existing registrations.. 3494 */ 3495 if (!new_reg) 3496 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3497 spin_unlock(&dev->dev_reservation_lock); 3498 3499 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3500 " created new reservation holder TYPE: %s on object RTPI:" 3501 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, 3502 core_scsi3_pr_dump_type(type), rtpi, 3503 dest_pr_reg->pr_res_generation); 3504 pr_debug("SPC-3 PR Successfully moved reservation from" 3505 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3506 tf_ops->fabric_name, pr_reg_nacl->initiatorname, 3507 i_buf, dest_tf_ops->fabric_name, 3508 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3509 iport_ptr : ""); 3510 /* 3511 * It is now safe to release configfs group dependencies for destination 3512 * of Transport ID Initiator Device/Port Identifier 3513 */ 3514 core_scsi3_lunacl_undepend_item(dest_se_deve); 3515 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3516 core_scsi3_tpg_undepend_item(dest_se_tpg); 3517 /* 3518 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3519 * nexus on which PERSISTENT RESERVE OUT command was received. 3520 */ 3521 if (unreg) { 3522 spin_lock(&pr_tmpl->registration_lock); 3523 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3524 spin_unlock(&pr_tmpl->registration_lock); 3525 } else 3526 core_scsi3_put_pr_reg(pr_reg); 3527 3528 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3529 3530 core_scsi3_put_pr_reg(dest_pr_reg); 3531 return 0; 3532 out: 3533 if (buf) 3534 transport_kunmap_data_sg(cmd); 3535 if (dest_se_deve) 3536 core_scsi3_lunacl_undepend_item(dest_se_deve); 3537 if (dest_node_acl) 3538 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3539 core_scsi3_tpg_undepend_item(dest_se_tpg); 3540 3541 out_put_pr_reg: 3542 core_scsi3_put_pr_reg(pr_reg); 3543 return ret; 3544 } 3545 3546 static sense_reason_t 3547 target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key, 3548 u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt) 3549 { 3550 struct exec_cmd_ops *ops = cmd->protocol_data; 3551 3552 if (!cmd->se_sess || !cmd->se_lun) { 3553 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3554 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3555 } 3556 3557 if (!ops->execute_pr_out) { 3558 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 3559 return TCM_UNSUPPORTED_SCSI_OPCODE; 3560 } 3561 3562 switch (sa) { 3563 case PRO_REGISTER_AND_MOVE: 3564 case PRO_REPLACE_LOST_RESERVATION: 3565 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n"); 3566 return TCM_UNSUPPORTED_SCSI_OPCODE; 3567 } 3568 3569 if (spec_i_pt || all_tg_pt) { 3570 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n"); 3571 return TCM_UNSUPPORTED_SCSI_OPCODE; 3572 } 3573 3574 return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl); 3575 } 3576 3577 /* 3578 * See spc4r17 section 6.14 Table 170 3579 */ 3580 sense_reason_t 3581 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3582 { 3583 struct se_device *dev = cmd->se_dev; 3584 unsigned char *cdb = &cmd->t_task_cdb[0]; 3585 unsigned char *buf; 3586 u64 res_key, sa_res_key; 3587 int sa, scope, type, aptpl; 3588 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3589 sense_reason_t ret; 3590 3591 /* 3592 * Following spc2r20 5.5.1 Reservations overview: 3593 * 3594 * If a logical unit has been reserved by any RESERVE command and is 3595 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3596 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3597 * initiator or service action and shall terminate with a RESERVATION 3598 * CONFLICT status. 3599 */ 3600 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3601 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3602 " SPC-2 reservation is held, returning" 3603 " RESERVATION_CONFLICT\n"); 3604 return TCM_RESERVATION_CONFLICT; 3605 } 3606 3607 /* 3608 * FIXME: A NULL struct se_session pointer means an this is not coming from 3609 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3610 */ 3611 if (!cmd->se_sess) 3612 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3613 3614 if (cmd->data_length < 24) { 3615 pr_warn("SPC-PR: Received PR OUT parameter list" 3616 " length too small: %u\n", cmd->data_length); 3617 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3618 } 3619 3620 /* 3621 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3622 */ 3623 sa = (cdb[1] & 0x1f); 3624 scope = (cdb[2] & 0xf0); 3625 type = (cdb[2] & 0x0f); 3626 3627 buf = transport_kmap_data_sg(cmd); 3628 if (!buf) 3629 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3630 3631 /* 3632 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3633 */ 3634 res_key = get_unaligned_be64(&buf[0]); 3635 sa_res_key = get_unaligned_be64(&buf[8]); 3636 /* 3637 * REGISTER_AND_MOVE uses a different SA parameter list containing 3638 * SCSI TransportIDs. 3639 */ 3640 if (sa != PRO_REGISTER_AND_MOVE) { 3641 spec_i_pt = (buf[20] & 0x08); 3642 all_tg_pt = (buf[20] & 0x04); 3643 aptpl = (buf[20] & 0x01); 3644 } else { 3645 aptpl = (buf[17] & 0x01); 3646 unreg = (buf[17] & 0x02); 3647 } 3648 /* 3649 * If the backend device has been configured to force APTPL metadata 3650 * write-out, go ahead and propigate aptpl=1 down now. 3651 */ 3652 if (dev->dev_attrib.force_pr_aptpl) 3653 aptpl = 1; 3654 3655 transport_kunmap_data_sg(cmd); 3656 buf = NULL; 3657 3658 /* 3659 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3660 */ 3661 if (spec_i_pt && (sa != PRO_REGISTER)) 3662 return TCM_INVALID_PARAMETER_LIST; 3663 3664 /* 3665 * From spc4r17 section 6.14: 3666 * 3667 * If the SPEC_I_PT bit is set to zero, the service action is not 3668 * REGISTER AND MOVE, and the parameter list length is not 24, then 3669 * the command shall be terminated with CHECK CONDITION status, with 3670 * the sense key set to ILLEGAL REQUEST, and the additional sense 3671 * code set to PARAMETER LIST LENGTH ERROR. 3672 */ 3673 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3674 (cmd->data_length != 24)) { 3675 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3676 " list length: %u\n", cmd->data_length); 3677 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3678 } 3679 3680 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 3681 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type, 3682 aptpl, all_tg_pt, spec_i_pt); 3683 goto done; 3684 } 3685 3686 /* 3687 * (core_scsi3_emulate_pro_* function parameters 3688 * are defined by spc4r17 Table 174: 3689 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3690 */ 3691 switch (sa) { 3692 case PRO_REGISTER: 3693 ret = core_scsi3_emulate_pro_register(cmd, 3694 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3695 break; 3696 case PRO_RESERVE: 3697 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3698 break; 3699 case PRO_RELEASE: 3700 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3701 break; 3702 case PRO_CLEAR: 3703 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3704 break; 3705 case PRO_PREEMPT: 3706 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3707 res_key, sa_res_key, PREEMPT); 3708 break; 3709 case PRO_PREEMPT_AND_ABORT: 3710 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3711 res_key, sa_res_key, PREEMPT_AND_ABORT); 3712 break; 3713 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3714 ret = core_scsi3_emulate_pro_register(cmd, 3715 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3716 break; 3717 case PRO_REGISTER_AND_MOVE: 3718 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3719 sa_res_key, aptpl, unreg); 3720 break; 3721 default: 3722 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3723 " action: 0x%02x\n", sa); 3724 return TCM_INVALID_CDB_FIELD; 3725 } 3726 3727 done: 3728 if (!ret) 3729 target_complete_cmd(cmd, SAM_STAT_GOOD); 3730 return ret; 3731 } 3732 3733 /* 3734 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3735 * 3736 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3737 */ 3738 static sense_reason_t 3739 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3740 { 3741 struct se_device *dev = cmd->se_dev; 3742 struct t10_pr_registration *pr_reg; 3743 unsigned char *buf; 3744 u32 add_len = 0, off = 8; 3745 3746 if (cmd->data_length < 8) { 3747 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3748 " too small\n", cmd->data_length); 3749 return TCM_INVALID_CDB_FIELD; 3750 } 3751 3752 buf = transport_kmap_data_sg(cmd); 3753 if (!buf) 3754 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3755 3756 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3757 3758 spin_lock(&dev->t10_pr.registration_lock); 3759 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3760 pr_reg_list) { 3761 /* 3762 * Check for overflow of 8byte PRI READ_KEYS payload and 3763 * next reservation key list descriptor. 3764 */ 3765 if (off + 8 <= cmd->data_length) { 3766 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3767 off += 8; 3768 } 3769 /* 3770 * SPC5r17: 6.16.2 READ KEYS service action 3771 * The ADDITIONAL LENGTH field indicates the number of bytes in 3772 * the Reservation key list. The contents of the ADDITIONAL 3773 * LENGTH field are not altered based on the allocation length 3774 */ 3775 add_len += 8; 3776 } 3777 spin_unlock(&dev->t10_pr.registration_lock); 3778 3779 put_unaligned_be32(add_len, &buf[4]); 3780 target_set_cmd_data_length(cmd, 8 + add_len); 3781 3782 transport_kunmap_data_sg(cmd); 3783 3784 return 0; 3785 } 3786 3787 /* 3788 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3789 * 3790 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3791 */ 3792 static sense_reason_t 3793 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3794 { 3795 struct se_device *dev = cmd->se_dev; 3796 struct t10_pr_registration *pr_reg; 3797 unsigned char *buf; 3798 u64 pr_res_key; 3799 u32 add_len = 0; 3800 3801 if (cmd->data_length < 8) { 3802 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3803 " too small\n", cmd->data_length); 3804 return TCM_INVALID_CDB_FIELD; 3805 } 3806 3807 buf = transport_kmap_data_sg(cmd); 3808 if (!buf) 3809 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3810 3811 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3812 3813 spin_lock(&dev->dev_reservation_lock); 3814 pr_reg = dev->dev_pr_res_holder; 3815 if (pr_reg) { 3816 /* 3817 * Set the Additional Length to 16 when a reservation is held 3818 */ 3819 add_len = 16; 3820 put_unaligned_be32(add_len, &buf[4]); 3821 3822 if (cmd->data_length < 22) 3823 goto err; 3824 3825 /* 3826 * Set the Reservation key. 3827 * 3828 * From spc4r17, section 5.7.10: 3829 * A persistent reservation holder has its reservation key 3830 * returned in the parameter data from a PERSISTENT 3831 * RESERVE IN command with READ RESERVATION service action as 3832 * follows: 3833 * a) For a persistent reservation of the type Write Exclusive 3834 * - All Registrants or Exclusive Access All Regitrants, 3835 * the reservation key shall be set to zero; or 3836 * b) For all other persistent reservation types, the 3837 * reservation key shall be set to the registered 3838 * reservation key for the I_T nexus that holds the 3839 * persistent reservation. 3840 */ 3841 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3842 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3843 pr_res_key = 0; 3844 else 3845 pr_res_key = pr_reg->pr_res_key; 3846 3847 put_unaligned_be64(pr_res_key, &buf[8]); 3848 /* 3849 * Set the SCOPE and TYPE 3850 */ 3851 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3852 (pr_reg->pr_res_type & 0x0f); 3853 } 3854 3855 target_set_cmd_data_length(cmd, 8 + add_len); 3856 3857 err: 3858 spin_unlock(&dev->dev_reservation_lock); 3859 transport_kunmap_data_sg(cmd); 3860 3861 return 0; 3862 } 3863 3864 /* 3865 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3866 * 3867 * See spc4r17 section 6.13.4 Table 165 3868 */ 3869 static sense_reason_t 3870 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3871 { 3872 struct se_device *dev = cmd->se_dev; 3873 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3874 unsigned char *buf; 3875 u16 len = 8; /* Hardcoded to 8. */ 3876 3877 if (cmd->data_length < 6) { 3878 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3879 " %u too small\n", cmd->data_length); 3880 return TCM_INVALID_CDB_FIELD; 3881 } 3882 3883 buf = transport_kmap_data_sg(cmd); 3884 if (!buf) 3885 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3886 3887 put_unaligned_be16(len, &buf[0]); 3888 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3889 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3890 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3891 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3892 /* 3893 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3894 * set the TMV: Task Mask Valid bit. 3895 */ 3896 buf[3] |= 0x80; 3897 /* 3898 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3899 */ 3900 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3901 /* 3902 * PTPL_A: Persistence across Target Power Loss Active bit 3903 */ 3904 if (pr_tmpl->pr_aptpl_active) 3905 buf[3] |= 0x01; 3906 /* 3907 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3908 */ 3909 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3910 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3911 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3912 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3913 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3914 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3915 3916 target_set_cmd_data_length(cmd, len); 3917 3918 transport_kunmap_data_sg(cmd); 3919 3920 return 0; 3921 } 3922 3923 /* 3924 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3925 * 3926 * See spc4r17 section 6.13.5 Table 168 and 169 3927 */ 3928 static sense_reason_t 3929 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3930 { 3931 struct se_device *dev = cmd->se_dev; 3932 struct se_node_acl *se_nacl; 3933 struct se_portal_group *se_tpg; 3934 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3935 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3936 unsigned char *buf; 3937 u32 add_desc_len = 0, add_len = 0; 3938 u32 off = 8; /* off into first Full Status descriptor */ 3939 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3940 int exp_desc_len, desc_len; 3941 bool all_reg = false; 3942 3943 if (cmd->data_length < 8) { 3944 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3945 " too small\n", cmd->data_length); 3946 return TCM_INVALID_CDB_FIELD; 3947 } 3948 3949 buf = transport_kmap_data_sg(cmd); 3950 if (!buf) 3951 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3952 3953 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3954 3955 spin_lock(&dev->dev_reservation_lock); 3956 if (dev->dev_pr_res_holder) { 3957 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3958 3959 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3960 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3961 all_reg = true; 3962 pr_res_type = pr_holder->pr_res_type; 3963 pr_res_scope = pr_holder->pr_res_scope; 3964 } 3965 } 3966 spin_unlock(&dev->dev_reservation_lock); 3967 3968 spin_lock(&pr_tmpl->registration_lock); 3969 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3970 &pr_tmpl->registration_list, pr_reg_list) { 3971 3972 se_nacl = pr_reg->pr_reg_nacl; 3973 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3974 add_desc_len = 0; 3975 3976 atomic_inc_mb(&pr_reg->pr_res_holders); 3977 spin_unlock(&pr_tmpl->registration_lock); 3978 /* 3979 * Determine expected length of $FABRIC_MOD specific 3980 * TransportID full status descriptor.. 3981 */ 3982 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3983 &format_code); 3984 if (exp_desc_len < 0 || 3985 exp_desc_len + add_len > cmd->data_length) { 3986 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3987 " out of buffer: %d\n", cmd->data_length); 3988 spin_lock(&pr_tmpl->registration_lock); 3989 atomic_dec_mb(&pr_reg->pr_res_holders); 3990 break; 3991 } 3992 /* 3993 * Set RESERVATION KEY 3994 */ 3995 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3996 off += 8; 3997 off += 4; /* Skip Over Reserved area */ 3998 3999 /* 4000 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4001 */ 4002 if (pr_reg->pr_reg_all_tg_pt) 4003 buf[off] = 0x02; 4004 /* 4005 * The struct se_lun pointer will be present for the 4006 * reservation holder for PR_HOLDER bit. 4007 * 4008 * Also, if this registration is the reservation 4009 * holder or there is an All Registrants reservation 4010 * active, fill in SCOPE and TYPE in the next byte. 4011 */ 4012 if (pr_reg->pr_res_holder) { 4013 buf[off++] |= 0x01; 4014 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4015 (pr_reg->pr_res_type & 0x0f); 4016 } else if (all_reg) { 4017 buf[off++] |= 0x01; 4018 buf[off++] = (pr_res_scope & 0xf0) | 4019 (pr_res_type & 0x0f); 4020 } else { 4021 off += 2; 4022 } 4023 4024 off += 4; /* Skip over reserved area */ 4025 /* 4026 * From spc4r17 6.3.15: 4027 * 4028 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4029 * IDENTIFIER field contains the relative port identifier (see 4030 * 3.1.120) of the target port that is part of the I_T nexus 4031 * described by this full status descriptor. If the ALL_TG_PT 4032 * bit is set to one, the contents of the RELATIVE TARGET PORT 4033 * IDENTIFIER field are not defined by this standard. 4034 */ 4035 if (!pr_reg->pr_reg_all_tg_pt) { 4036 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4037 4038 put_unaligned_be16(sep_rtpi, &buf[off]); 4039 off += 2; 4040 } else 4041 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4042 4043 buf[off+4] = se_tpg->proto_id; 4044 4045 /* 4046 * Now, have the $FABRIC_MOD fill in the transport ID. 4047 */ 4048 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4049 &format_code, &buf[off+4]); 4050 4051 spin_lock(&pr_tmpl->registration_lock); 4052 atomic_dec_mb(&pr_reg->pr_res_holders); 4053 4054 if (desc_len < 0) 4055 break; 4056 /* 4057 * Set the ADDITIONAL DESCRIPTOR LENGTH 4058 */ 4059 put_unaligned_be32(desc_len, &buf[off]); 4060 off += 4; 4061 /* 4062 * Size of full desctipor header minus TransportID 4063 * containing $FABRIC_MOD specific) initiator device/port 4064 * WWN information. 4065 * 4066 * See spc4r17 Section 6.13.5 Table 169 4067 */ 4068 add_desc_len = (24 + desc_len); 4069 4070 off += desc_len; 4071 add_len += add_desc_len; 4072 } 4073 spin_unlock(&pr_tmpl->registration_lock); 4074 /* 4075 * Set ADDITIONAL_LENGTH 4076 */ 4077 put_unaligned_be32(add_len, &buf[4]); 4078 target_set_cmd_data_length(cmd, 8 + add_len); 4079 4080 transport_kunmap_data_sg(cmd); 4081 4082 return 0; 4083 } 4084 4085 static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa) 4086 { 4087 struct exec_cmd_ops *ops = cmd->protocol_data; 4088 unsigned char *buf; 4089 sense_reason_t ret; 4090 4091 if (cmd->data_length < 8) { 4092 pr_err("PRIN SA SCSI Data Length: %u too small\n", 4093 cmd->data_length); 4094 return TCM_INVALID_CDB_FIELD; 4095 } 4096 4097 if (!ops->execute_pr_in) { 4098 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 4099 return TCM_UNSUPPORTED_SCSI_OPCODE; 4100 } 4101 4102 if (sa == PRI_READ_FULL_STATUS) { 4103 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n"); 4104 return TCM_UNSUPPORTED_SCSI_OPCODE; 4105 } 4106 4107 buf = transport_kmap_data_sg(cmd); 4108 if (!buf) 4109 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4110 4111 ret = ops->execute_pr_in(cmd, sa, buf); 4112 4113 transport_kunmap_data_sg(cmd); 4114 return ret; 4115 } 4116 4117 sense_reason_t 4118 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4119 { 4120 u8 sa = cmd->t_task_cdb[1] & 0x1f; 4121 sense_reason_t ret; 4122 4123 /* 4124 * Following spc2r20 5.5.1 Reservations overview: 4125 * 4126 * If a logical unit has been reserved by any RESERVE command and is 4127 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4128 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4129 * initiator or service action and shall terminate with a RESERVATION 4130 * CONFLICT status. 4131 */ 4132 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4133 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4134 " SPC-2 reservation is held, returning" 4135 " RESERVATION_CONFLICT\n"); 4136 return TCM_RESERVATION_CONFLICT; 4137 } 4138 4139 if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 4140 ret = target_try_pr_in_pt(cmd, sa); 4141 goto done; 4142 } 4143 4144 switch (sa) { 4145 case PRI_READ_KEYS: 4146 ret = core_scsi3_pri_read_keys(cmd); 4147 break; 4148 case PRI_READ_RESERVATION: 4149 ret = core_scsi3_pri_read_reservation(cmd); 4150 break; 4151 case PRI_REPORT_CAPABILITIES: 4152 ret = core_scsi3_pri_report_capabilities(cmd); 4153 break; 4154 case PRI_READ_FULL_STATUS: 4155 ret = core_scsi3_pri_read_full_status(cmd); 4156 break; 4157 default: 4158 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4159 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4160 return TCM_INVALID_CDB_FIELD; 4161 } 4162 4163 done: 4164 if (!ret) 4165 target_complete_cmd(cmd, SAM_STAT_GOOD); 4166 return ret; 4167 } 4168 4169 sense_reason_t 4170 target_check_reservation(struct se_cmd *cmd) 4171 { 4172 struct se_device *dev = cmd->se_dev; 4173 sense_reason_t ret; 4174 4175 if (!cmd->se_sess) 4176 return 0; 4177 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4178 return 0; 4179 if (!dev->dev_attrib.emulate_pr) 4180 return 0; 4181 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4182 return 0; 4183 4184 spin_lock(&dev->dev_reservation_lock); 4185 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4186 ret = target_scsi2_reservation_check(cmd); 4187 else 4188 ret = target_scsi3_pr_reservation_check(cmd); 4189 spin_unlock(&dev->dev_reservation_lock); 4190 4191 return ret; 4192 } 4193