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