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 1163 spin_lock(&pr_tmpl->registration_lock); 1164 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1165 &pr_tmpl->registration_list, pr_reg_list) { 1166 /* 1167 * First look for a matching struct se_node_acl 1168 */ 1169 if (pr_reg->pr_reg_nacl != nacl) 1170 continue; 1171 1172 /* 1173 * If this registration does NOT contain a fabric provided 1174 * ISID, then we have found a match. 1175 */ 1176 if (!pr_reg->isid_present_at_reg) { 1177 atomic_inc_mb(&pr_reg->pr_res_holders); 1178 spin_unlock(&pr_tmpl->registration_lock); 1179 return pr_reg; 1180 } 1181 /* 1182 * If the *pr_reg contains a fabric defined ISID for multi-value 1183 * SCSI Initiator Port TransportIDs, then we expect a valid 1184 * matching ISID to be provided by the local SCSI Initiator Port. 1185 */ 1186 if (!isid) 1187 continue; 1188 if (strcmp(isid, pr_reg->pr_reg_isid)) 1189 continue; 1190 1191 atomic_inc_mb(&pr_reg->pr_res_holders); 1192 spin_unlock(&pr_tmpl->registration_lock); 1193 return pr_reg; 1194 } 1195 spin_unlock(&pr_tmpl->registration_lock); 1196 1197 return NULL; 1198 } 1199 1200 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1201 struct se_device *dev, 1202 struct se_node_acl *nacl, 1203 struct se_session *sess) 1204 { 1205 struct se_portal_group *tpg = nacl->se_tpg; 1206 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1207 1208 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1209 memset(&buf[0], 0, PR_REG_ISID_LEN); 1210 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1211 PR_REG_ISID_LEN); 1212 isid_ptr = &buf[0]; 1213 } 1214 1215 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1216 } 1217 1218 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1219 { 1220 atomic_dec_mb(&pr_reg->pr_res_holders); 1221 } 1222 1223 static int core_scsi3_check_implicit_release( 1224 struct se_device *dev, 1225 struct t10_pr_registration *pr_reg) 1226 { 1227 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1228 struct t10_pr_registration *pr_res_holder; 1229 int ret = 0; 1230 1231 spin_lock(&dev->dev_reservation_lock); 1232 pr_res_holder = dev->dev_pr_res_holder; 1233 if (!pr_res_holder) { 1234 spin_unlock(&dev->dev_reservation_lock); 1235 return ret; 1236 } 1237 if (pr_res_holder == pr_reg) { 1238 /* 1239 * Perform an implicit RELEASE if the registration that 1240 * is being released is holding the reservation. 1241 * 1242 * From spc4r17, section 5.7.11.1: 1243 * 1244 * e) If the I_T nexus is the persistent reservation holder 1245 * and the persistent reservation is not an all registrants 1246 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1247 * service action or REGISTER AND IGNORE EXISTING KEY 1248 * service action with the SERVICE ACTION RESERVATION KEY 1249 * field set to zero (see 5.7.11.3). 1250 */ 1251 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1252 ret = 1; 1253 /* 1254 * For 'All Registrants' reservation types, all existing 1255 * registrations are still processed as reservation holders 1256 * in core_scsi3_pr_seq_non_holder() after the initial 1257 * reservation holder is implicitly released here. 1258 */ 1259 } else if (pr_reg->pr_reg_all_tg_pt && 1260 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1261 pr_reg->pr_reg_nacl->initiatorname)) && 1262 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1263 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1264 " UNREGISTER while existing reservation with matching" 1265 " key 0x%016Lx is present from another SCSI Initiator" 1266 " Port\n", pr_reg->pr_res_key); 1267 ret = -EPERM; 1268 } 1269 spin_unlock(&dev->dev_reservation_lock); 1270 1271 return ret; 1272 } 1273 1274 static void __core_scsi3_free_registration( 1275 struct se_device *dev, 1276 struct t10_pr_registration *pr_reg, 1277 struct list_head *preempt_and_abort_list, 1278 int dec_holders) 1279 __releases(&pr_tmpl->registration_lock) 1280 __acquires(&pr_tmpl->registration_lock) 1281 { 1282 const struct target_core_fabric_ops *tfo = 1283 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1284 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1285 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1286 struct se_dev_entry *deve; 1287 char i_buf[PR_REG_ISID_ID_LEN]; 1288 1289 lockdep_assert_held(&pr_tmpl->registration_lock); 1290 1291 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1292 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1293 1294 if (!list_empty(&pr_reg->pr_reg_list)) 1295 list_del(&pr_reg->pr_reg_list); 1296 /* 1297 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1298 * so call core_scsi3_put_pr_reg() to decrement our reference. 1299 */ 1300 if (dec_holders) 1301 core_scsi3_put_pr_reg(pr_reg); 1302 1303 spin_unlock(&pr_tmpl->registration_lock); 1304 /* 1305 * Wait until all reference from any other I_T nexuses for this 1306 * *pr_reg have been released. Because list_del() is called above, 1307 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1308 * count back to zero, and we release *pr_reg. 1309 */ 1310 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1311 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1312 tfo->fabric_name); 1313 cpu_relax(); 1314 } 1315 1316 rcu_read_lock(); 1317 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1318 if (deve) 1319 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1320 rcu_read_unlock(); 1321 1322 spin_lock(&pr_tmpl->registration_lock); 1323 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1324 " Node: %s%s\n", tfo->fabric_name, 1325 pr_reg->pr_reg_nacl->initiatorname, 1326 i_buf); 1327 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1328 " Port(s)\n", tfo->fabric_name, 1329 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1330 dev->transport->name); 1331 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1332 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, 1333 pr_reg->pr_res_generation); 1334 1335 if (!preempt_and_abort_list) { 1336 pr_reg->pr_reg_deve = NULL; 1337 pr_reg->pr_reg_nacl = NULL; 1338 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1339 return; 1340 } 1341 /* 1342 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1343 * are released once the ABORT_TASK_SET has completed.. 1344 */ 1345 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1346 } 1347 1348 void core_scsi3_free_pr_reg_from_nacl( 1349 struct se_device *dev, 1350 struct se_node_acl *nacl) 1351 { 1352 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1353 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1354 bool free_reg = false; 1355 /* 1356 * If the passed se_node_acl matches the reservation holder, 1357 * release the reservation. 1358 */ 1359 spin_lock(&dev->dev_reservation_lock); 1360 pr_res_holder = dev->dev_pr_res_holder; 1361 if ((pr_res_holder != NULL) && 1362 (pr_res_holder->pr_reg_nacl == nacl)) { 1363 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1364 free_reg = true; 1365 } 1366 spin_unlock(&dev->dev_reservation_lock); 1367 /* 1368 * Release any registration associated with the struct se_node_acl. 1369 */ 1370 spin_lock(&pr_tmpl->registration_lock); 1371 if (pr_res_holder && free_reg) 1372 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1373 1374 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1375 &pr_tmpl->registration_list, pr_reg_list) { 1376 1377 if (pr_reg->pr_reg_nacl != nacl) 1378 continue; 1379 1380 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1381 } 1382 spin_unlock(&pr_tmpl->registration_lock); 1383 } 1384 1385 void core_scsi3_free_all_registrations( 1386 struct se_device *dev) 1387 { 1388 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1389 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1390 1391 spin_lock(&dev->dev_reservation_lock); 1392 pr_res_holder = dev->dev_pr_res_holder; 1393 if (pr_res_holder != NULL) { 1394 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1395 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1396 pr_res_holder, 0, 0); 1397 } 1398 spin_unlock(&dev->dev_reservation_lock); 1399 1400 spin_lock(&pr_tmpl->registration_lock); 1401 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1402 &pr_tmpl->registration_list, pr_reg_list) { 1403 1404 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1405 } 1406 spin_unlock(&pr_tmpl->registration_lock); 1407 1408 spin_lock(&pr_tmpl->aptpl_reg_lock); 1409 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1410 pr_reg_aptpl_list) { 1411 list_del(&pr_reg->pr_reg_aptpl_list); 1412 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1413 } 1414 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1415 } 1416 1417 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1418 { 1419 return target_depend_item(&tpg->tpg_group.cg_item); 1420 } 1421 1422 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1423 { 1424 target_undepend_item(&tpg->tpg_group.cg_item); 1425 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1426 } 1427 1428 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1429 { 1430 if (nacl->dynamic_node_acl) 1431 return 0; 1432 return target_depend_item(&nacl->acl_group.cg_item); 1433 } 1434 1435 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1436 { 1437 if (!nacl->dynamic_node_acl) 1438 target_undepend_item(&nacl->acl_group.cg_item); 1439 atomic_dec_mb(&nacl->acl_pr_ref_count); 1440 } 1441 1442 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1443 { 1444 struct se_lun_acl *lun_acl; 1445 1446 /* 1447 * For nacl->dynamic_node_acl=1 1448 */ 1449 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1450 kref_read(&se_deve->pr_kref) != 0); 1451 if (!lun_acl) 1452 return 0; 1453 1454 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1455 } 1456 1457 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1458 { 1459 struct se_lun_acl *lun_acl; 1460 1461 /* 1462 * For nacl->dynamic_node_acl=1 1463 */ 1464 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1465 kref_read(&se_deve->pr_kref) != 0); 1466 if (!lun_acl) { 1467 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1468 return; 1469 } 1470 1471 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1472 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1473 } 1474 1475 static sense_reason_t 1476 core_scsi3_decode_spec_i_port( 1477 struct se_cmd *cmd, 1478 struct se_portal_group *tpg, 1479 unsigned char *l_isid, 1480 u64 sa_res_key, 1481 int all_tg_pt, 1482 int aptpl) 1483 { 1484 struct se_device *dev = cmd->se_dev; 1485 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1486 struct se_session *se_sess = cmd->se_sess; 1487 struct se_node_acl *dest_node_acl = NULL; 1488 struct se_dev_entry *dest_se_deve = NULL; 1489 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1490 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1491 LIST_HEAD(tid_dest_list); 1492 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1493 unsigned char *buf, *ptr, proto_ident; 1494 const unsigned char *i_str = NULL; 1495 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1496 sense_reason_t ret; 1497 u32 tpdl, tid_len = 0; 1498 u32 dest_rtpi = 0; 1499 1500 /* 1501 * Allocate a struct pr_transport_id_holder and setup the 1502 * local_node_acl pointer and add to struct list_head tid_dest_list 1503 * for add registration processing in the loop of tid_dest_list below. 1504 */ 1505 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1506 if (!tidh_new) { 1507 pr_err("Unable to allocate tidh_new\n"); 1508 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1509 } 1510 INIT_LIST_HEAD(&tidh_new->dest_list); 1511 tidh_new->dest_tpg = tpg; 1512 tidh_new->dest_node_acl = se_sess->se_node_acl; 1513 1514 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1515 se_sess->se_node_acl, cmd->se_lun, 1516 NULL, cmd->orig_fe_lun, l_isid, 1517 sa_res_key, all_tg_pt, aptpl); 1518 if (!local_pr_reg) { 1519 kfree(tidh_new); 1520 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1521 } 1522 1523 if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) { 1524 kfree(tidh_new); 1525 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1526 target_pr_kref_release); 1527 kmem_cache_free(t10_pr_reg_cache, local_pr_reg); 1528 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1529 } 1530 1531 tidh_new->dest_pr_reg = local_pr_reg; 1532 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1533 1534 if (cmd->data_length < 28) { 1535 pr_warn("SPC-PR: Received PR OUT parameter list" 1536 " length too small: %u\n", cmd->data_length); 1537 ret = TCM_INVALID_PARAMETER_LIST; 1538 goto out; 1539 } 1540 1541 buf = transport_kmap_data_sg(cmd); 1542 if (!buf) { 1543 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1544 goto out; 1545 } 1546 1547 /* 1548 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1549 * first extract TransportID Parameter Data Length, and make sure 1550 * the value matches up to the SCSI expected data transfer length. 1551 */ 1552 tpdl = get_unaligned_be32(&buf[24]); 1553 1554 if ((tpdl + 28) != cmd->data_length) { 1555 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1556 " does not equal CDB data_length: %u\n", tpdl, 1557 cmd->data_length); 1558 ret = TCM_INVALID_PARAMETER_LIST; 1559 goto out_unmap; 1560 } 1561 /* 1562 * Start processing the received transport IDs using the 1563 * receiving I_T Nexus portal's fabric dependent methods to 1564 * obtain the SCSI Initiator Port/Device Identifiers. 1565 */ 1566 ptr = &buf[28]; 1567 1568 while (tpdl > 0) { 1569 struct se_lun *dest_lun, *tmp_lun; 1570 1571 proto_ident = (ptr[0] & 0x0f); 1572 dest_tpg = NULL; 1573 1574 spin_lock(&dev->se_port_lock); 1575 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1576 tmp_tpg = tmp_lun->lun_tpg; 1577 1578 /* 1579 * Look for the matching proto_ident provided by 1580 * the received TransportID 1581 */ 1582 if (tmp_tpg->proto_id != proto_ident) 1583 continue; 1584 dest_rtpi = tmp_lun->lun_rtpi; 1585 1586 iport_ptr = NULL; 1587 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1588 ptr, &tid_len, &iport_ptr); 1589 if (!i_str) 1590 continue; 1591 /* 1592 * Determine if this SCSI device server requires that 1593 * SCSI Intiatior TransportID w/ ISIDs is enforced 1594 * for fabric modules (iSCSI) requiring them. 1595 */ 1596 if (tpg->se_tpg_tfo->sess_get_initiator_sid && 1597 dev->dev_attrib.enforce_pr_isids && 1598 !iport_ptr) { 1599 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.", 1600 i_str); 1601 ret = TCM_INVALID_PARAMETER_LIST; 1602 spin_unlock(&dev->se_port_lock); 1603 goto out_unmap; 1604 } 1605 1606 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1607 spin_unlock(&dev->se_port_lock); 1608 1609 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1610 pr_err(" core_scsi3_tpg_depend_item()" 1611 " for tmp_tpg\n"); 1612 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1613 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1614 goto out_unmap; 1615 } 1616 /* 1617 * Locate the destination initiator ACL to be registered 1618 * from the decoded fabric module specific TransportID 1619 * at *i_str. 1620 */ 1621 mutex_lock(&tmp_tpg->acl_node_mutex); 1622 dest_node_acl = __core_tpg_get_initiator_node_acl( 1623 tmp_tpg, i_str); 1624 if (dest_node_acl) 1625 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1626 mutex_unlock(&tmp_tpg->acl_node_mutex); 1627 1628 if (!dest_node_acl) { 1629 core_scsi3_tpg_undepend_item(tmp_tpg); 1630 spin_lock(&dev->se_port_lock); 1631 continue; 1632 } 1633 1634 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1635 pr_err("configfs_depend_item() failed" 1636 " for dest_node_acl->acl_group\n"); 1637 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1638 core_scsi3_tpg_undepend_item(tmp_tpg); 1639 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1640 goto out_unmap; 1641 } 1642 1643 dest_tpg = tmp_tpg; 1644 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1645 " %s Port RTPI: %hu\n", 1646 dest_tpg->se_tpg_tfo->fabric_name, 1647 dest_node_acl->initiatorname, dest_rtpi); 1648 1649 spin_lock(&dev->se_port_lock); 1650 break; 1651 } 1652 spin_unlock(&dev->se_port_lock); 1653 1654 if (!dest_tpg) { 1655 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1656 " dest_tpg\n"); 1657 ret = TCM_INVALID_PARAMETER_LIST; 1658 goto out_unmap; 1659 } 1660 1661 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1662 " tid_len: %d for %s + %s\n", 1663 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, 1664 tpdl, tid_len, i_str, iport_ptr); 1665 1666 if (tid_len > tpdl) { 1667 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1668 " %u for Transport ID: %s\n", tid_len, ptr); 1669 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1670 core_scsi3_tpg_undepend_item(dest_tpg); 1671 ret = TCM_INVALID_PARAMETER_LIST; 1672 goto out_unmap; 1673 } 1674 /* 1675 * Locate the desintation struct se_dev_entry pointer for matching 1676 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1677 * Target Port. 1678 */ 1679 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1680 dest_rtpi); 1681 if (!dest_se_deve) { 1682 pr_err("Unable to locate %s dest_se_deve" 1683 " from destination RTPI: %hu\n", 1684 dest_tpg->se_tpg_tfo->fabric_name, 1685 dest_rtpi); 1686 1687 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1688 core_scsi3_tpg_undepend_item(dest_tpg); 1689 ret = TCM_INVALID_PARAMETER_LIST; 1690 goto out_unmap; 1691 } 1692 1693 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1694 pr_err("core_scsi3_lunacl_depend_item()" 1695 " failed\n"); 1696 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1697 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1698 core_scsi3_tpg_undepend_item(dest_tpg); 1699 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1700 goto out_unmap; 1701 } 1702 1703 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1704 " dest_se_deve mapped_lun: %llu\n", 1705 dest_tpg->se_tpg_tfo->fabric_name, 1706 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1707 1708 /* 1709 * Skip any TransportIDs that already have a registration for 1710 * this target port. 1711 */ 1712 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1713 iport_ptr); 1714 if (pr_reg_e) { 1715 core_scsi3_put_pr_reg(pr_reg_e); 1716 core_scsi3_lunacl_undepend_item(dest_se_deve); 1717 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1718 core_scsi3_tpg_undepend_item(dest_tpg); 1719 ptr += tid_len; 1720 tpdl -= tid_len; 1721 tid_len = 0; 1722 continue; 1723 } 1724 /* 1725 * Allocate a struct pr_transport_id_holder and setup 1726 * the dest_node_acl and dest_se_deve pointers for the 1727 * loop below. 1728 */ 1729 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1730 GFP_KERNEL); 1731 if (!tidh_new) { 1732 pr_err("Unable to allocate tidh_new\n"); 1733 core_scsi3_lunacl_undepend_item(dest_se_deve); 1734 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1735 core_scsi3_tpg_undepend_item(dest_tpg); 1736 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1737 goto out_unmap; 1738 } 1739 INIT_LIST_HEAD(&tidh_new->dest_list); 1740 tidh_new->dest_tpg = dest_tpg; 1741 tidh_new->dest_node_acl = dest_node_acl; 1742 tidh_new->dest_se_deve = dest_se_deve; 1743 1744 /* 1745 * Allocate, but do NOT add the registration for the 1746 * TransportID referenced SCSI Initiator port. This 1747 * done because of the following from spc4r17 in section 1748 * 6.14.3 wrt SPEC_I_PT: 1749 * 1750 * "If a registration fails for any initiator port (e.g., if th 1751 * logical unit does not have enough resources available to 1752 * hold the registration information), no registrations shall be 1753 * made, and the command shall be terminated with 1754 * CHECK CONDITION status." 1755 * 1756 * That means we call __core_scsi3_alloc_registration() here, 1757 * and then call __core_scsi3_add_registration() in the 1758 * 2nd loop which will never fail. 1759 */ 1760 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1761 kref_read(&dest_se_deve->pr_kref) != 0); 1762 1763 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1764 dest_node_acl, dest_lun, dest_se_deve, 1765 dest_se_deve->mapped_lun, iport_ptr, 1766 sa_res_key, all_tg_pt, aptpl); 1767 if (!dest_pr_reg) { 1768 core_scsi3_lunacl_undepend_item(dest_se_deve); 1769 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1770 core_scsi3_tpg_undepend_item(dest_tpg); 1771 kfree(tidh_new); 1772 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1773 goto out_unmap; 1774 } 1775 tidh_new->dest_pr_reg = dest_pr_reg; 1776 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1777 1778 ptr += tid_len; 1779 tpdl -= tid_len; 1780 tid_len = 0; 1781 1782 } 1783 1784 transport_kunmap_data_sg(cmd); 1785 1786 /* 1787 * Go ahead and create a registrations from tid_dest_list for the 1788 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1789 * and dest_se_deve. 1790 * 1791 * The SA Reservation Key from the PROUT is set for the 1792 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1793 * means that the TransportID Initiator port will be 1794 * registered on all of the target ports in the SCSI target device 1795 * ALL_TG_PT=0 means the registration will only be for the 1796 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1797 * was received. 1798 */ 1799 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1800 dest_tpg = tidh->dest_tpg; 1801 dest_node_acl = tidh->dest_node_acl; 1802 dest_se_deve = tidh->dest_se_deve; 1803 dest_pr_reg = tidh->dest_pr_reg; 1804 1805 list_del(&tidh->dest_list); 1806 kfree(tidh); 1807 1808 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1809 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1810 1811 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1812 dest_pr_reg, 0, 0); 1813 1814 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1815 " registered Transport ID for Node: %s%s Mapped LUN:" 1816 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, 1817 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1818 dest_se_deve->mapped_lun : 0); 1819 1820 if (dest_pr_reg == local_pr_reg) 1821 continue; 1822 1823 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1824 core_scsi3_tpg_undepend_item(dest_tpg); 1825 } 1826 1827 return 0; 1828 out_unmap: 1829 transport_kunmap_data_sg(cmd); 1830 out: 1831 /* 1832 * For the failure case, release everything from tid_dest_list 1833 * including *dest_pr_reg and the configfs dependances.. 1834 */ 1835 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1836 bool is_local = false; 1837 1838 dest_tpg = tidh->dest_tpg; 1839 dest_node_acl = tidh->dest_node_acl; 1840 dest_se_deve = tidh->dest_se_deve; 1841 dest_pr_reg = tidh->dest_pr_reg; 1842 1843 if (dest_pr_reg == local_pr_reg) 1844 is_local = true; 1845 1846 list_del(&tidh->dest_list); 1847 kfree(tidh); 1848 /* 1849 * Release any extra ALL_TG_PT=1 registrations for 1850 * the SPEC_I_PT=1 case. 1851 */ 1852 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1853 &dest_pr_reg->pr_reg_atp_list, 1854 pr_reg_atp_mem_list) { 1855 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1856 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1857 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1858 } 1859 1860 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1861 core_scsi3_lunacl_undepend_item(dest_se_deve); 1862 1863 if (is_local) 1864 continue; 1865 1866 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1867 core_scsi3_tpg_undepend_item(dest_tpg); 1868 } 1869 return ret; 1870 } 1871 1872 static int core_scsi3_update_aptpl_buf( 1873 struct se_device *dev, 1874 unsigned char *buf, 1875 u32 pr_aptpl_buf_len) 1876 { 1877 struct se_portal_group *tpg; 1878 struct t10_pr_registration *pr_reg; 1879 unsigned char tmp[512], isid_buf[32]; 1880 ssize_t len = 0; 1881 int reg_count = 0; 1882 int ret = 0; 1883 1884 spin_lock(&dev->dev_reservation_lock); 1885 spin_lock(&dev->t10_pr.registration_lock); 1886 /* 1887 * Walk the registration list.. 1888 */ 1889 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1890 pr_reg_list) { 1891 1892 tmp[0] = '\0'; 1893 isid_buf[0] = '\0'; 1894 tpg = pr_reg->pr_reg_nacl->se_tpg; 1895 /* 1896 * Write out any ISID value to APTPL metadata that was included 1897 * in the original registration. 1898 */ 1899 if (pr_reg->isid_present_at_reg) 1900 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1901 pr_reg->pr_reg_isid); 1902 /* 1903 * Include special metadata if the pr_reg matches the 1904 * reservation holder. 1905 */ 1906 if (dev->dev_pr_res_holder == pr_reg) { 1907 snprintf(tmp, 512, "PR_REG_START: %d" 1908 "\ninitiator_fabric=%s\n" 1909 "initiator_node=%s\n%s" 1910 "sa_res_key=%llu\n" 1911 "res_holder=1\nres_type=%02x\n" 1912 "res_scope=%02x\nres_all_tg_pt=%d\n" 1913 "mapped_lun=%llu\n", reg_count, 1914 tpg->se_tpg_tfo->fabric_name, 1915 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1916 pr_reg->pr_res_key, pr_reg->pr_res_type, 1917 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1918 pr_reg->pr_res_mapped_lun); 1919 } else { 1920 snprintf(tmp, 512, "PR_REG_START: %d\n" 1921 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1922 "sa_res_key=%llu\nres_holder=0\n" 1923 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1924 reg_count, tpg->se_tpg_tfo->fabric_name, 1925 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1926 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1927 pr_reg->pr_res_mapped_lun); 1928 } 1929 1930 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1931 pr_err("Unable to update renaming APTPL metadata," 1932 " reallocating larger buffer\n"); 1933 ret = -EMSGSIZE; 1934 goto out; 1935 } 1936 len += sprintf(buf+len, "%s", tmp); 1937 1938 /* 1939 * Include information about the associated SCSI target port. 1940 */ 1941 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1942 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1943 " %d\n", tpg->se_tpg_tfo->fabric_name, 1944 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1945 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1946 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1947 reg_count); 1948 1949 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1950 pr_err("Unable to update renaming APTPL metadata," 1951 " reallocating larger buffer\n"); 1952 ret = -EMSGSIZE; 1953 goto out; 1954 } 1955 len += sprintf(buf+len, "%s", tmp); 1956 reg_count++; 1957 } 1958 1959 if (!reg_count) 1960 len += sprintf(buf+len, "No Registrations or Reservations"); 1961 1962 out: 1963 spin_unlock(&dev->t10_pr.registration_lock); 1964 spin_unlock(&dev->dev_reservation_lock); 1965 1966 return ret; 1967 } 1968 1969 static int __core_scsi3_write_aptpl_to_file( 1970 struct se_device *dev, 1971 unsigned char *buf) 1972 { 1973 struct t10_wwn *wwn = &dev->t10_wwn; 1974 struct file *file; 1975 int flags = O_RDWR | O_CREAT | O_TRUNC; 1976 char *path; 1977 u32 pr_aptpl_buf_len; 1978 int ret; 1979 loff_t pos = 0; 1980 1981 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1982 &wwn->unit_serial[0]); 1983 if (!path) 1984 return -ENOMEM; 1985 1986 file = filp_open(path, flags, 0600); 1987 if (IS_ERR(file)) { 1988 pr_err("filp_open(%s) for APTPL metadata" 1989 " failed\n", path); 1990 kfree(path); 1991 return PTR_ERR(file); 1992 } 1993 1994 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1995 1996 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1997 1998 if (ret < 0) 1999 pr_debug("Error writing APTPL metadata file: %s\n", path); 2000 fput(file); 2001 kfree(path); 2002 2003 return (ret < 0) ? -EIO : 0; 2004 } 2005 2006 /* 2007 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2008 * write out the updated metadata to struct file for this SCSI device. 2009 */ 2010 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2011 { 2012 unsigned char *buf; 2013 int rc, len = PR_APTPL_BUF_LEN; 2014 2015 if (!aptpl) { 2016 char *null_buf = "No Registrations or Reservations\n"; 2017 2018 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2019 dev->t10_pr.pr_aptpl_active = 0; 2020 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2021 2022 if (rc) 2023 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2024 2025 return 0; 2026 } 2027 retry: 2028 buf = vzalloc(len); 2029 if (!buf) 2030 return TCM_OUT_OF_RESOURCES; 2031 2032 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2033 if (rc < 0) { 2034 vfree(buf); 2035 len *= 2; 2036 goto retry; 2037 } 2038 2039 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2040 if (rc != 0) { 2041 pr_err("SPC-3 PR: Could not update APTPL\n"); 2042 vfree(buf); 2043 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2044 } 2045 dev->t10_pr.pr_aptpl_active = 1; 2046 vfree(buf); 2047 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2048 return 0; 2049 } 2050 2051 static sense_reason_t 2052 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2053 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2054 { 2055 struct se_session *se_sess = cmd->se_sess; 2056 struct se_device *dev = cmd->se_dev; 2057 struct se_lun *se_lun = cmd->se_lun; 2058 struct se_portal_group *se_tpg; 2059 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2060 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2061 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2062 sense_reason_t ret = TCM_NO_SENSE; 2063 int pr_holder = 0, type; 2064 2065 if (!se_sess || !se_lun) { 2066 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2067 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2068 } 2069 se_tpg = se_sess->se_tpg; 2070 2071 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2072 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2073 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2074 PR_REG_ISID_LEN); 2075 isid_ptr = &isid_buf[0]; 2076 } 2077 /* 2078 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2079 */ 2080 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2081 if (!pr_reg) { 2082 if (res_key) { 2083 pr_warn("SPC-3 PR: Reservation Key non-zero" 2084 " for SA REGISTER, returning CONFLICT\n"); 2085 return TCM_RESERVATION_CONFLICT; 2086 } 2087 /* 2088 * Do nothing but return GOOD status. 2089 */ 2090 if (!sa_res_key) 2091 return 0; 2092 2093 if (!spec_i_pt) { 2094 /* 2095 * Perform the Service Action REGISTER on the Initiator 2096 * Port Endpoint that the PRO was received from on the 2097 * Logical Unit of the SCSI device server. 2098 */ 2099 if (core_scsi3_alloc_registration(cmd->se_dev, 2100 se_sess->se_node_acl, cmd->se_lun, 2101 NULL, cmd->orig_fe_lun, isid_ptr, 2102 sa_res_key, all_tg_pt, aptpl, 2103 register_type, 0)) { 2104 pr_err("Unable to allocate" 2105 " struct t10_pr_registration\n"); 2106 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2107 } 2108 } else { 2109 /* 2110 * Register both the Initiator port that received 2111 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2112 * TransportID from Parameter list and loop through 2113 * fabric dependent parameter list while calling 2114 * logic from of core_scsi3_alloc_registration() for 2115 * each TransportID provided SCSI Initiator Port/Device 2116 */ 2117 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2118 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2119 if (ret != 0) 2120 return ret; 2121 } 2122 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2123 } 2124 2125 /* ok, existing registration */ 2126 2127 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2128 pr_err("SPC-3 PR REGISTER: Received" 2129 " res_key: 0x%016Lx does not match" 2130 " existing SA REGISTER res_key:" 2131 " 0x%016Lx\n", res_key, 2132 pr_reg->pr_res_key); 2133 ret = TCM_RESERVATION_CONFLICT; 2134 goto out; 2135 } 2136 2137 if (spec_i_pt) { 2138 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2139 " set on a registered nexus\n"); 2140 ret = TCM_INVALID_PARAMETER_LIST; 2141 goto out; 2142 } 2143 2144 /* 2145 * An existing ALL_TG_PT=1 registration being released 2146 * must also set ALL_TG_PT=1 in the incoming PROUT. 2147 */ 2148 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2149 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2150 " registration exists, but ALL_TG_PT=1 bit not" 2151 " present in received PROUT\n"); 2152 ret = TCM_INVALID_CDB_FIELD; 2153 goto out; 2154 } 2155 2156 /* 2157 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2158 */ 2159 if (sa_res_key) { 2160 /* 2161 * Increment PRgeneration counter for struct se_device" 2162 * upon a successful REGISTER, see spc4r17 section 6.3.2 2163 * READ_KEYS service action. 2164 */ 2165 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2166 pr_reg->pr_res_key = sa_res_key; 2167 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2168 " Key for %s to: 0x%016Lx PRgeneration:" 2169 " 0x%08x\n", cmd->se_tfo->fabric_name, 2170 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2171 pr_reg->pr_reg_nacl->initiatorname, 2172 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2173 2174 } else { 2175 /* 2176 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2177 */ 2178 type = pr_reg->pr_res_type; 2179 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2180 pr_reg); 2181 if (pr_holder < 0) { 2182 ret = TCM_RESERVATION_CONFLICT; 2183 goto out; 2184 } 2185 2186 spin_lock(&pr_tmpl->registration_lock); 2187 /* 2188 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2189 * and matching pr_res_key. 2190 */ 2191 if (pr_reg->pr_reg_all_tg_pt) { 2192 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2193 &pr_tmpl->registration_list, 2194 pr_reg_list) { 2195 2196 if (!pr_reg_p->pr_reg_all_tg_pt) 2197 continue; 2198 if (pr_reg_p->pr_res_key != res_key) 2199 continue; 2200 if (pr_reg == pr_reg_p) 2201 continue; 2202 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2203 pr_reg_p->pr_reg_nacl->initiatorname)) 2204 continue; 2205 2206 __core_scsi3_free_registration(dev, 2207 pr_reg_p, NULL, 0); 2208 } 2209 } 2210 2211 /* 2212 * Release the calling I_T Nexus registration now.. 2213 */ 2214 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2215 pr_reg = NULL; 2216 2217 /* 2218 * From spc4r17, section 5.7.11.3 Unregistering 2219 * 2220 * If the persistent reservation is a registrants only 2221 * type, the device server shall establish a unit 2222 * attention condition for the initiator port associated 2223 * with every registered I_T nexus except for the I_T 2224 * nexus on which the PERSISTENT RESERVE OUT command was 2225 * received, with the additional sense code set to 2226 * RESERVATIONS RELEASED. 2227 */ 2228 if (pr_holder && 2229 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2230 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2231 list_for_each_entry(pr_reg_p, 2232 &pr_tmpl->registration_list, 2233 pr_reg_list) { 2234 2235 target_ua_allocate_lun( 2236 pr_reg_p->pr_reg_nacl, 2237 pr_reg_p->pr_res_mapped_lun, 2238 0x2A, 2239 ASCQ_2AH_RESERVATIONS_RELEASED); 2240 } 2241 } 2242 2243 spin_unlock(&pr_tmpl->registration_lock); 2244 } 2245 2246 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2247 2248 out: 2249 if (pr_reg) 2250 core_scsi3_put_pr_reg(pr_reg); 2251 return ret; 2252 } 2253 2254 unsigned char *core_scsi3_pr_dump_type(int type) 2255 { 2256 switch (type) { 2257 case PR_TYPE_WRITE_EXCLUSIVE: 2258 return "Write Exclusive Access"; 2259 case PR_TYPE_EXCLUSIVE_ACCESS: 2260 return "Exclusive Access"; 2261 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2262 return "Write Exclusive Access, Registrants Only"; 2263 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2264 return "Exclusive Access, Registrants Only"; 2265 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2266 return "Write Exclusive Access, All Registrants"; 2267 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2268 return "Exclusive Access, All Registrants"; 2269 default: 2270 break; 2271 } 2272 2273 return "Unknown SPC-3 PR Type"; 2274 } 2275 2276 static sense_reason_t 2277 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2278 { 2279 struct se_device *dev = cmd->se_dev; 2280 struct se_session *se_sess = cmd->se_sess; 2281 struct se_lun *se_lun = cmd->se_lun; 2282 struct t10_pr_registration *pr_reg, *pr_res_holder; 2283 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2284 char i_buf[PR_REG_ISID_ID_LEN]; 2285 sense_reason_t ret; 2286 2287 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2288 2289 if (!se_sess || !se_lun) { 2290 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2291 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2292 } 2293 /* 2294 * Locate the existing *pr_reg via struct se_node_acl pointers 2295 */ 2296 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2297 se_sess); 2298 if (!pr_reg) { 2299 pr_err("SPC-3 PR: Unable to locate" 2300 " PR_REGISTERED *pr_reg for RESERVE\n"); 2301 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2302 } 2303 /* 2304 * From spc4r17 Section 5.7.9: Reserving: 2305 * 2306 * An application client creates a persistent reservation by issuing 2307 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2308 * a registered I_T nexus with the following parameters: 2309 * a) RESERVATION KEY set to the value of the reservation key that is 2310 * registered with the logical unit for the I_T nexus; and 2311 */ 2312 if (res_key != pr_reg->pr_res_key) { 2313 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2314 " does not match existing SA REGISTER res_key:" 2315 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2316 ret = TCM_RESERVATION_CONFLICT; 2317 goto out_put_pr_reg; 2318 } 2319 /* 2320 * From spc4r17 Section 5.7.9: Reserving: 2321 * 2322 * From above: 2323 * b) TYPE field and SCOPE field set to the persistent reservation 2324 * being created. 2325 * 2326 * Only one persistent reservation is allowed at a time per logical unit 2327 * and that persistent reservation has a scope of LU_SCOPE. 2328 */ 2329 if (scope != PR_SCOPE_LU_SCOPE) { 2330 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2331 ret = TCM_INVALID_PARAMETER_LIST; 2332 goto out_put_pr_reg; 2333 } 2334 /* 2335 * See if we have an existing PR reservation holder pointer at 2336 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2337 * *pr_res_holder. 2338 */ 2339 spin_lock(&dev->dev_reservation_lock); 2340 pr_res_holder = dev->dev_pr_res_holder; 2341 if (pr_res_holder) { 2342 /* 2343 * From spc4r17 Section 5.7.9: Reserving: 2344 * 2345 * If the device server receives a PERSISTENT RESERVE OUT 2346 * command from an I_T nexus other than a persistent reservation 2347 * holder (see 5.7.10) that attempts to create a persistent 2348 * reservation when a persistent reservation already exists for 2349 * the logical unit, then the command shall be completed with 2350 * RESERVATION CONFLICT status. 2351 */ 2352 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2353 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2354 pr_err("SPC-3 PR: Attempted RESERVE from" 2355 " [%s]: %s while reservation already held by" 2356 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2357 cmd->se_tfo->fabric_name, 2358 se_sess->se_node_acl->initiatorname, 2359 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2360 pr_res_holder->pr_reg_nacl->initiatorname); 2361 2362 spin_unlock(&dev->dev_reservation_lock); 2363 ret = TCM_RESERVATION_CONFLICT; 2364 goto out_put_pr_reg; 2365 } 2366 /* 2367 * From spc4r17 Section 5.7.9: Reserving: 2368 * 2369 * If a persistent reservation holder attempts to modify the 2370 * type or scope of an existing persistent reservation, the 2371 * command shall be completed with RESERVATION CONFLICT status. 2372 */ 2373 if ((pr_res_holder->pr_res_type != type) || 2374 (pr_res_holder->pr_res_scope != scope)) { 2375 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2376 pr_err("SPC-3 PR: Attempted RESERVE from" 2377 " [%s]: %s trying to change TYPE and/or SCOPE," 2378 " while reservation already held by [%s]: %s," 2379 " returning RESERVATION_CONFLICT\n", 2380 cmd->se_tfo->fabric_name, 2381 se_sess->se_node_acl->initiatorname, 2382 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2383 pr_res_holder->pr_reg_nacl->initiatorname); 2384 2385 spin_unlock(&dev->dev_reservation_lock); 2386 ret = TCM_RESERVATION_CONFLICT; 2387 goto out_put_pr_reg; 2388 } 2389 /* 2390 * From spc4r17 Section 5.7.9: Reserving: 2391 * 2392 * If the device server receives a PERSISTENT RESERVE OUT 2393 * command with RESERVE service action where the TYPE field and 2394 * the SCOPE field contain the same values as the existing type 2395 * and scope from a persistent reservation holder, it shall not 2396 * make any change to the existing persistent reservation and 2397 * shall completethe command with GOOD status. 2398 */ 2399 spin_unlock(&dev->dev_reservation_lock); 2400 ret = 0; 2401 goto out_put_pr_reg; 2402 } 2403 /* 2404 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2405 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2406 */ 2407 pr_reg->pr_res_scope = scope; 2408 pr_reg->pr_res_type = type; 2409 pr_reg->pr_res_holder = 1; 2410 dev->dev_pr_res_holder = pr_reg; 2411 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2412 2413 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2414 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2415 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), 2416 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2417 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2418 cmd->se_tfo->fabric_name, 2419 se_sess->se_node_acl->initiatorname, 2420 i_buf); 2421 spin_unlock(&dev->dev_reservation_lock); 2422 2423 if (pr_tmpl->pr_aptpl_active) 2424 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2425 2426 ret = 0; 2427 out_put_pr_reg: 2428 core_scsi3_put_pr_reg(pr_reg); 2429 return ret; 2430 } 2431 2432 static sense_reason_t 2433 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2434 u64 res_key) 2435 { 2436 switch (type) { 2437 case PR_TYPE_WRITE_EXCLUSIVE: 2438 case PR_TYPE_EXCLUSIVE_ACCESS: 2439 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2440 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2441 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2442 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2443 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2444 default: 2445 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2446 " 0x%02x\n", type); 2447 return TCM_INVALID_CDB_FIELD; 2448 } 2449 } 2450 2451 static void __core_scsi3_complete_pro_release( 2452 struct se_device *dev, 2453 struct se_node_acl *se_nacl, 2454 struct t10_pr_registration *pr_reg, 2455 int explicit, 2456 int unreg) 2457 { 2458 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2459 char i_buf[PR_REG_ISID_ID_LEN]; 2460 int pr_res_type = 0, pr_res_scope = 0; 2461 2462 lockdep_assert_held(&dev->dev_reservation_lock); 2463 2464 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2465 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2466 /* 2467 * Go ahead and release the current PR reservation holder. 2468 * If an All Registrants reservation is currently active and 2469 * a unregister operation is requested, replace the current 2470 * dev_pr_res_holder with another active registration. 2471 */ 2472 if (dev->dev_pr_res_holder) { 2473 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2474 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2475 dev->dev_pr_res_holder->pr_res_type = 0; 2476 dev->dev_pr_res_holder->pr_res_scope = 0; 2477 dev->dev_pr_res_holder->pr_res_holder = 0; 2478 dev->dev_pr_res_holder = NULL; 2479 } 2480 if (!unreg) 2481 goto out; 2482 2483 spin_lock(&dev->t10_pr.registration_lock); 2484 list_del_init(&pr_reg->pr_reg_list); 2485 /* 2486 * If the I_T nexus is a reservation holder, the persistent reservation 2487 * is of an all registrants type, and the I_T nexus is the last remaining 2488 * registered I_T nexus, then the device server shall also release the 2489 * persistent reservation. 2490 */ 2491 if (!list_empty(&dev->t10_pr.registration_list) && 2492 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2493 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2494 dev->dev_pr_res_holder = 2495 list_entry(dev->t10_pr.registration_list.next, 2496 struct t10_pr_registration, pr_reg_list); 2497 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2498 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2499 dev->dev_pr_res_holder->pr_res_holder = 1; 2500 } 2501 spin_unlock(&dev->t10_pr.registration_lock); 2502 out: 2503 if (!dev->dev_pr_res_holder) { 2504 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2505 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2506 tfo->fabric_name, (explicit) ? "explicit" : 2507 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2508 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2509 } 2510 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2511 tfo->fabric_name, se_nacl->initiatorname, 2512 i_buf); 2513 /* 2514 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2515 */ 2516 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2517 } 2518 2519 static sense_reason_t 2520 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2521 u64 res_key) 2522 { 2523 struct se_device *dev = cmd->se_dev; 2524 struct se_session *se_sess = cmd->se_sess; 2525 struct se_lun *se_lun = cmd->se_lun; 2526 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2527 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2528 sense_reason_t ret = 0; 2529 2530 if (!se_sess || !se_lun) { 2531 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2532 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2533 } 2534 /* 2535 * Locate the existing *pr_reg via struct se_node_acl pointers 2536 */ 2537 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2538 if (!pr_reg) { 2539 pr_err("SPC-3 PR: Unable to locate" 2540 " PR_REGISTERED *pr_reg for RELEASE\n"); 2541 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2542 } 2543 /* 2544 * From spc4r17 Section 5.7.11.2 Releasing: 2545 * 2546 * If there is no persistent reservation or in response to a persistent 2547 * reservation release request from a registered I_T nexus that is not a 2548 * persistent reservation holder (see 5.7.10), the device server shall 2549 * do the following: 2550 * 2551 * a) Not release the persistent reservation, if any; 2552 * b) Not remove any registrations; and 2553 * c) Complete the command with GOOD status. 2554 */ 2555 spin_lock(&dev->dev_reservation_lock); 2556 pr_res_holder = dev->dev_pr_res_holder; 2557 if (!pr_res_holder) { 2558 /* 2559 * No persistent reservation, return GOOD status. 2560 */ 2561 spin_unlock(&dev->dev_reservation_lock); 2562 goto out_put_pr_reg; 2563 } 2564 2565 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2566 /* 2567 * Release request from a registered I_T nexus that is not a 2568 * persistent reservation holder. return GOOD status. 2569 */ 2570 spin_unlock(&dev->dev_reservation_lock); 2571 goto out_put_pr_reg; 2572 } 2573 2574 /* 2575 * From spc4r17 Section 5.7.11.2 Releasing: 2576 * 2577 * Only the persistent reservation holder (see 5.7.10) is allowed to 2578 * release a persistent reservation. 2579 * 2580 * An application client releases the persistent reservation by issuing 2581 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2582 * an I_T nexus that is a persistent reservation holder with the 2583 * following parameters: 2584 * 2585 * a) RESERVATION KEY field set to the value of the reservation key 2586 * that is registered with the logical unit for the I_T nexus; 2587 */ 2588 if (res_key != pr_reg->pr_res_key) { 2589 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2590 " does not match existing SA REGISTER res_key:" 2591 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2592 spin_unlock(&dev->dev_reservation_lock); 2593 ret = TCM_RESERVATION_CONFLICT; 2594 goto out_put_pr_reg; 2595 } 2596 /* 2597 * From spc4r17 Section 5.7.11.2 Releasing and above: 2598 * 2599 * b) TYPE field and SCOPE field set to match the persistent 2600 * reservation being released. 2601 */ 2602 if ((pr_res_holder->pr_res_type != type) || 2603 (pr_res_holder->pr_res_scope != scope)) { 2604 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2605 pr_err("SPC-3 PR RELEASE: Attempted to release" 2606 " reservation from [%s]: %s with different TYPE " 2607 "and/or SCOPE while reservation already held by" 2608 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2609 cmd->se_tfo->fabric_name, 2610 se_sess->se_node_acl->initiatorname, 2611 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2612 pr_res_holder->pr_reg_nacl->initiatorname); 2613 2614 spin_unlock(&dev->dev_reservation_lock); 2615 ret = TCM_RESERVATION_CONFLICT; 2616 goto out_put_pr_reg; 2617 } 2618 /* 2619 * In response to a persistent reservation release request from the 2620 * persistent reservation holder the device server shall perform a 2621 * release by doing the following as an uninterrupted series of actions: 2622 * a) Release the persistent reservation; 2623 * b) Not remove any registration(s); 2624 * c) If the released persistent reservation is a registrants only type 2625 * or all registrants type persistent reservation, 2626 * the device server shall establish a unit attention condition for 2627 * the initiator port associated with every regis- 2628 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2629 * RESERVE OUT command with RELEASE service action was received, 2630 * with the additional sense code set to RESERVATIONS RELEASED; and 2631 * d) If the persistent reservation is of any other type, the device 2632 * server shall not establish a unit attention condition. 2633 */ 2634 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2635 pr_reg, 1, 0); 2636 2637 spin_unlock(&dev->dev_reservation_lock); 2638 2639 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2640 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2641 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2642 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2643 /* 2644 * If no UNIT ATTENTION conditions will be established for 2645 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2646 * go ahead and check for APTPL=1 update+write below 2647 */ 2648 goto write_aptpl; 2649 } 2650 2651 spin_lock(&pr_tmpl->registration_lock); 2652 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2653 pr_reg_list) { 2654 /* 2655 * Do not establish a UNIT ATTENTION condition 2656 * for the calling I_T Nexus 2657 */ 2658 if (pr_reg_p == pr_reg) 2659 continue; 2660 2661 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2662 pr_reg_p->pr_res_mapped_lun, 2663 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2664 } 2665 spin_unlock(&pr_tmpl->registration_lock); 2666 2667 write_aptpl: 2668 if (pr_tmpl->pr_aptpl_active) 2669 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2670 2671 out_put_pr_reg: 2672 core_scsi3_put_pr_reg(pr_reg); 2673 return ret; 2674 } 2675 2676 static sense_reason_t 2677 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2678 { 2679 struct se_device *dev = cmd->se_dev; 2680 struct se_node_acl *pr_reg_nacl; 2681 struct se_session *se_sess = cmd->se_sess; 2682 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2683 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2684 u64 pr_res_mapped_lun = 0; 2685 int calling_it_nexus = 0; 2686 /* 2687 * Locate the existing *pr_reg via struct se_node_acl pointers 2688 */ 2689 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2690 se_sess->se_node_acl, se_sess); 2691 if (!pr_reg_n) { 2692 pr_err("SPC-3 PR: Unable to locate" 2693 " PR_REGISTERED *pr_reg for CLEAR\n"); 2694 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2695 } 2696 /* 2697 * From spc4r17 section 5.7.11.6, Clearing: 2698 * 2699 * Any application client may release the persistent reservation and 2700 * remove all registrations from a device server by issuing a 2701 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2702 * registered I_T nexus with the following parameter: 2703 * 2704 * a) RESERVATION KEY field set to the value of the reservation key 2705 * that is registered with the logical unit for the I_T nexus. 2706 */ 2707 if (res_key != pr_reg_n->pr_res_key) { 2708 pr_err("SPC-3 PR REGISTER: Received" 2709 " res_key: 0x%016Lx does not match" 2710 " existing SA REGISTER res_key:" 2711 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2712 core_scsi3_put_pr_reg(pr_reg_n); 2713 return TCM_RESERVATION_CONFLICT; 2714 } 2715 /* 2716 * a) Release the persistent reservation, if any; 2717 */ 2718 spin_lock(&dev->dev_reservation_lock); 2719 pr_res_holder = dev->dev_pr_res_holder; 2720 if (pr_res_holder) { 2721 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2722 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2723 pr_res_holder, 0, 0); 2724 } 2725 spin_unlock(&dev->dev_reservation_lock); 2726 /* 2727 * b) Remove all registration(s) (see spc4r17 5.7.7); 2728 */ 2729 spin_lock(&pr_tmpl->registration_lock); 2730 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2731 &pr_tmpl->registration_list, pr_reg_list) { 2732 2733 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2734 pr_reg_nacl = pr_reg->pr_reg_nacl; 2735 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2736 __core_scsi3_free_registration(dev, pr_reg, NULL, 2737 calling_it_nexus); 2738 /* 2739 * e) Establish a unit attention condition for the initiator 2740 * port associated with every registered I_T nexus other 2741 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2742 * command with CLEAR service action was received, with the 2743 * additional sense code set to RESERVATIONS PREEMPTED. 2744 */ 2745 if (!calling_it_nexus) 2746 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2747 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2748 } 2749 spin_unlock(&pr_tmpl->registration_lock); 2750 2751 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2752 cmd->se_tfo->fabric_name); 2753 2754 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2755 2756 core_scsi3_pr_generation(dev); 2757 return 0; 2758 } 2759 2760 static void __core_scsi3_complete_pro_preempt( 2761 struct se_device *dev, 2762 struct t10_pr_registration *pr_reg, 2763 struct list_head *preempt_and_abort_list, 2764 int type, 2765 int scope, 2766 enum preempt_type preempt_type) 2767 { 2768 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2769 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2770 char i_buf[PR_REG_ISID_ID_LEN]; 2771 2772 lockdep_assert_held(&dev->dev_reservation_lock); 2773 2774 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2775 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2776 /* 2777 * Do an implicit RELEASE of the existing reservation. 2778 */ 2779 if (dev->dev_pr_res_holder) 2780 __core_scsi3_complete_pro_release(dev, nacl, 2781 dev->dev_pr_res_holder, 0, 0); 2782 2783 dev->dev_pr_res_holder = pr_reg; 2784 pr_reg->pr_res_holder = 1; 2785 pr_reg->pr_res_type = type; 2786 pr_reg->pr_res_scope = scope; 2787 2788 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2789 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2790 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2791 core_scsi3_pr_dump_type(type), 2792 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2793 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2794 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2795 nacl->initiatorname, i_buf); 2796 /* 2797 * For PREEMPT_AND_ABORT, add the preempting reservation's 2798 * struct t10_pr_registration to the list that will be compared 2799 * against received CDBs.. 2800 */ 2801 if (preempt_and_abort_list) 2802 list_add_tail(&pr_reg->pr_reg_abort_list, 2803 preempt_and_abort_list); 2804 } 2805 2806 static void core_scsi3_release_preempt_and_abort( 2807 struct list_head *preempt_and_abort_list, 2808 struct t10_pr_registration *pr_reg_holder) 2809 { 2810 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2811 2812 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2813 pr_reg_abort_list) { 2814 2815 list_del(&pr_reg->pr_reg_abort_list); 2816 if (pr_reg_holder == pr_reg) 2817 continue; 2818 if (pr_reg->pr_res_holder) { 2819 pr_warn("pr_reg->pr_res_holder still set\n"); 2820 continue; 2821 } 2822 2823 pr_reg->pr_reg_deve = NULL; 2824 pr_reg->pr_reg_nacl = NULL; 2825 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2826 } 2827 } 2828 2829 static sense_reason_t 2830 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2831 u64 sa_res_key, enum preempt_type preempt_type) 2832 { 2833 struct se_device *dev = cmd->se_dev; 2834 struct se_node_acl *pr_reg_nacl; 2835 struct se_session *se_sess = cmd->se_sess; 2836 LIST_HEAD(preempt_and_abort_list); 2837 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2838 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2839 u64 pr_res_mapped_lun = 0; 2840 int all_reg = 0, calling_it_nexus = 0; 2841 bool sa_res_key_unmatched = sa_res_key != 0; 2842 int prh_type = 0, prh_scope = 0; 2843 2844 if (!se_sess) 2845 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2846 2847 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2848 se_sess); 2849 if (!pr_reg_n) { 2850 pr_err("SPC-3 PR: Unable to locate" 2851 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2852 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2853 return TCM_RESERVATION_CONFLICT; 2854 } 2855 if (pr_reg_n->pr_res_key != res_key) { 2856 core_scsi3_put_pr_reg(pr_reg_n); 2857 return TCM_RESERVATION_CONFLICT; 2858 } 2859 if (scope != PR_SCOPE_LU_SCOPE) { 2860 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2861 core_scsi3_put_pr_reg(pr_reg_n); 2862 return TCM_INVALID_PARAMETER_LIST; 2863 } 2864 2865 spin_lock(&dev->dev_reservation_lock); 2866 pr_res_holder = dev->dev_pr_res_holder; 2867 if (pr_res_holder && 2868 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2869 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2870 all_reg = 1; 2871 2872 if (!all_reg && !sa_res_key) { 2873 spin_unlock(&dev->dev_reservation_lock); 2874 core_scsi3_put_pr_reg(pr_reg_n); 2875 return TCM_INVALID_PARAMETER_LIST; 2876 } 2877 /* 2878 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2879 * 2880 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2881 * persistent reservation holder or there is no persistent reservation 2882 * holder (i.e., there is no persistent reservation), then the device 2883 * server shall perform a preempt by doing the following in an 2884 * uninterrupted series of actions. (See below..) 2885 */ 2886 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2887 /* 2888 * No existing or SA Reservation Key matching reservations.. 2889 * 2890 * PROUT SA PREEMPT with All Registrant type reservations are 2891 * allowed to be processed without a matching SA Reservation Key 2892 */ 2893 spin_lock(&pr_tmpl->registration_lock); 2894 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2895 &pr_tmpl->registration_list, pr_reg_list) { 2896 /* 2897 * Removing of registrations in non all registrants 2898 * type reservations without a matching SA reservation 2899 * key. 2900 * 2901 * a) Remove the registrations for all I_T nexuses 2902 * specified by the SERVICE ACTION RESERVATION KEY 2903 * field; 2904 * b) Ignore the contents of the SCOPE and TYPE fields; 2905 * c) Process tasks as defined in 5.7.1; and 2906 * d) Establish a unit attention condition for the 2907 * initiator port associated with every I_T nexus 2908 * that lost its registration other than the I_T 2909 * nexus on which the PERSISTENT RESERVE OUT command 2910 * was received, with the additional sense code set 2911 * to REGISTRATIONS PREEMPTED. 2912 */ 2913 if (!all_reg) { 2914 if (pr_reg->pr_res_key != sa_res_key) 2915 continue; 2916 sa_res_key_unmatched = false; 2917 2918 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2919 pr_reg_nacl = pr_reg->pr_reg_nacl; 2920 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2921 __core_scsi3_free_registration(dev, pr_reg, 2922 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2923 NULL, calling_it_nexus); 2924 } else { 2925 /* 2926 * Case for any existing all registrants type 2927 * reservation, follow logic in spc4r17 section 2928 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2929 * 2930 * For a ZERO SA Reservation key, release 2931 * all other registrations and do an implicit 2932 * release of active persistent reservation. 2933 * 2934 * For a non-ZERO SA Reservation key, only 2935 * release the matching reservation key from 2936 * registrations. 2937 */ 2938 if ((sa_res_key) && 2939 (pr_reg->pr_res_key != sa_res_key)) 2940 continue; 2941 sa_res_key_unmatched = false; 2942 2943 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2944 if (calling_it_nexus) 2945 continue; 2946 2947 pr_reg_nacl = pr_reg->pr_reg_nacl; 2948 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2949 __core_scsi3_free_registration(dev, pr_reg, 2950 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2951 NULL, 0); 2952 } 2953 if (!calling_it_nexus) 2954 target_ua_allocate_lun(pr_reg_nacl, 2955 pr_res_mapped_lun, 0x2A, 2956 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2957 } 2958 spin_unlock(&pr_tmpl->registration_lock); 2959 /* 2960 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2961 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2962 * RESERVATION KEY field to a value that does not match any 2963 * registered reservation key, then the device server shall 2964 * complete the command with RESERVATION CONFLICT status. 2965 */ 2966 if (sa_res_key_unmatched) { 2967 spin_unlock(&dev->dev_reservation_lock); 2968 core_scsi3_put_pr_reg(pr_reg_n); 2969 return TCM_RESERVATION_CONFLICT; 2970 } 2971 /* 2972 * For an existing all registrants type reservation 2973 * with a zero SA rservation key, preempt the existing 2974 * reservation with the new PR type and scope. 2975 */ 2976 if (pr_res_holder && all_reg && !(sa_res_key)) { 2977 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2978 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2979 type, scope, preempt_type); 2980 2981 if (preempt_type == PREEMPT_AND_ABORT) 2982 core_scsi3_release_preempt_and_abort( 2983 &preempt_and_abort_list, pr_reg_n); 2984 } 2985 spin_unlock(&dev->dev_reservation_lock); 2986 2987 if (pr_tmpl->pr_aptpl_active) 2988 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2989 2990 core_scsi3_put_pr_reg(pr_reg_n); 2991 core_scsi3_pr_generation(cmd->se_dev); 2992 return 0; 2993 } 2994 /* 2995 * The PREEMPTing SA reservation key matches that of the 2996 * existing persistent reservation, first, we check if 2997 * we are preempting our own reservation. 2998 * From spc4r17, section 5.7.11.4.3 Preempting 2999 * persistent reservations and registration handling 3000 * 3001 * If an all registrants persistent reservation is not 3002 * present, it is not an error for the persistent 3003 * reservation holder to preempt itself (i.e., a 3004 * PERSISTENT RESERVE OUT with a PREEMPT service action 3005 * or a PREEMPT AND ABORT service action with the 3006 * SERVICE ACTION RESERVATION KEY value equal to the 3007 * persistent reservation holder's reservation key that 3008 * is received from the persistent reservation holder). 3009 * In that case, the device server shall establish the 3010 * new persistent reservation and maintain the 3011 * registration. 3012 */ 3013 prh_type = pr_res_holder->pr_res_type; 3014 prh_scope = pr_res_holder->pr_res_scope; 3015 /* 3016 * If the SERVICE ACTION RESERVATION KEY field identifies a 3017 * persistent reservation holder (see 5.7.10), the device 3018 * server shall perform a preempt by doing the following as 3019 * an uninterrupted series of actions: 3020 * 3021 * a) Release the persistent reservation for the holder 3022 * identified by the SERVICE ACTION RESERVATION KEY field; 3023 */ 3024 if (pr_reg_n != pr_res_holder) 3025 __core_scsi3_complete_pro_release(dev, 3026 pr_res_holder->pr_reg_nacl, 3027 dev->dev_pr_res_holder, 0, 0); 3028 /* 3029 * b) Remove the registrations for all I_T nexuses identified 3030 * by the SERVICE ACTION RESERVATION KEY field, except the 3031 * I_T nexus that is being used for the PERSISTENT RESERVE 3032 * OUT command. If an all registrants persistent reservation 3033 * is present and the SERVICE ACTION RESERVATION KEY field 3034 * is set to zero, then all registrations shall be removed 3035 * except for that of the I_T nexus that is being used for 3036 * the PERSISTENT RESERVE OUT command; 3037 */ 3038 spin_lock(&pr_tmpl->registration_lock); 3039 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3040 &pr_tmpl->registration_list, pr_reg_list) { 3041 3042 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3043 if (calling_it_nexus) 3044 continue; 3045 3046 if (pr_reg->pr_res_key != sa_res_key) 3047 continue; 3048 3049 pr_reg_nacl = pr_reg->pr_reg_nacl; 3050 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3051 __core_scsi3_free_registration(dev, pr_reg, 3052 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3053 calling_it_nexus); 3054 /* 3055 * e) Establish a unit attention condition for the initiator 3056 * port associated with every I_T nexus that lost its 3057 * persistent reservation and/or registration, with the 3058 * additional sense code set to REGISTRATIONS PREEMPTED; 3059 */ 3060 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3061 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3062 } 3063 spin_unlock(&pr_tmpl->registration_lock); 3064 /* 3065 * c) Establish a persistent reservation for the preempting 3066 * I_T nexus using the contents of the SCOPE and TYPE fields; 3067 */ 3068 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3069 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3070 type, scope, preempt_type); 3071 /* 3072 * d) Process tasks as defined in 5.7.1; 3073 * e) See above.. 3074 * f) If the type or scope has changed, then for every I_T nexus 3075 * whose reservation key was not removed, except for the I_T 3076 * nexus on which the PERSISTENT RESERVE OUT command was 3077 * received, the device server shall establish a unit 3078 * attention condition for the initiator port associated with 3079 * that I_T nexus, with the additional sense code set to 3080 * RESERVATIONS RELEASED. If the type or scope have not 3081 * changed, then no unit attention condition(s) shall be 3082 * established for this reason. 3083 */ 3084 if ((prh_type != type) || (prh_scope != scope)) { 3085 spin_lock(&pr_tmpl->registration_lock); 3086 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3087 &pr_tmpl->registration_list, pr_reg_list) { 3088 3089 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3090 if (calling_it_nexus) 3091 continue; 3092 3093 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3094 pr_reg->pr_res_mapped_lun, 0x2A, 3095 ASCQ_2AH_RESERVATIONS_RELEASED); 3096 } 3097 spin_unlock(&pr_tmpl->registration_lock); 3098 } 3099 spin_unlock(&dev->dev_reservation_lock); 3100 /* 3101 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3102 * All received CDBs for the matching existing reservation and 3103 * registrations undergo ABORT_TASK logic. 3104 * 3105 * From there, core_scsi3_release_preempt_and_abort() will 3106 * release every registration in the list (which have already 3107 * been removed from the primary pr_reg list), except the 3108 * new persistent reservation holder, the calling Initiator Port. 3109 */ 3110 if (preempt_type == PREEMPT_AND_ABORT) { 3111 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3112 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3113 pr_reg_n); 3114 } 3115 3116 if (pr_tmpl->pr_aptpl_active) 3117 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3118 3119 core_scsi3_put_pr_reg(pr_reg_n); 3120 core_scsi3_pr_generation(cmd->se_dev); 3121 return 0; 3122 } 3123 3124 static sense_reason_t 3125 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3126 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3127 { 3128 switch (type) { 3129 case PR_TYPE_WRITE_EXCLUSIVE: 3130 case PR_TYPE_EXCLUSIVE_ACCESS: 3131 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3132 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3133 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3134 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3135 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3136 sa_res_key, preempt_type); 3137 default: 3138 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3139 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3140 return TCM_INVALID_CDB_FIELD; 3141 } 3142 } 3143 3144 3145 static sense_reason_t 3146 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3147 u64 sa_res_key, int aptpl, int unreg) 3148 { 3149 struct se_session *se_sess = cmd->se_sess; 3150 struct se_device *dev = cmd->se_dev; 3151 struct se_dev_entry *dest_se_deve = NULL; 3152 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3153 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3154 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3155 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3156 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3157 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3158 unsigned char *buf; 3159 const unsigned char *initiator_str; 3160 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3161 u32 tid_len, tmp_tid_len; 3162 int new_reg = 0, type, scope, matching_iname; 3163 sense_reason_t ret; 3164 unsigned short rtpi; 3165 unsigned char proto_ident; 3166 3167 if (!se_sess || !se_lun) { 3168 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3169 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3170 } 3171 3172 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3173 se_tpg = se_sess->se_tpg; 3174 tf_ops = se_tpg->se_tpg_tfo; 3175 /* 3176 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3177 * Register behaviors for a REGISTER AND MOVE service action 3178 * 3179 * Locate the existing *pr_reg via struct se_node_acl pointers 3180 */ 3181 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3182 se_sess); 3183 if (!pr_reg) { 3184 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3185 " *pr_reg for REGISTER_AND_MOVE\n"); 3186 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3187 } 3188 /* 3189 * The provided reservation key much match the existing reservation key 3190 * provided during this initiator's I_T nexus registration. 3191 */ 3192 if (res_key != pr_reg->pr_res_key) { 3193 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3194 " res_key: 0x%016Lx does not match existing SA REGISTER" 3195 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3196 ret = TCM_RESERVATION_CONFLICT; 3197 goto out_put_pr_reg; 3198 } 3199 /* 3200 * The service active reservation key needs to be non zero 3201 */ 3202 if (!sa_res_key) { 3203 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3204 " sa_res_key\n"); 3205 ret = TCM_INVALID_PARAMETER_LIST; 3206 goto out_put_pr_reg; 3207 } 3208 3209 /* 3210 * Determine the Relative Target Port Identifier where the reservation 3211 * will be moved to for the TransportID containing SCSI initiator WWN 3212 * information. 3213 */ 3214 buf = transport_kmap_data_sg(cmd); 3215 if (!buf) { 3216 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3217 goto out_put_pr_reg; 3218 } 3219 3220 rtpi = get_unaligned_be16(&buf[18]); 3221 tid_len = get_unaligned_be32(&buf[20]); 3222 transport_kunmap_data_sg(cmd); 3223 buf = NULL; 3224 3225 if ((tid_len + 24) != cmd->data_length) { 3226 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3227 " does not equal CDB data_length: %u\n", tid_len, 3228 cmd->data_length); 3229 ret = TCM_INVALID_PARAMETER_LIST; 3230 goto out_put_pr_reg; 3231 } 3232 3233 spin_lock(&dev->se_port_lock); 3234 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3235 if (tmp_lun->lun_rtpi != rtpi) 3236 continue; 3237 dest_se_tpg = tmp_lun->lun_tpg; 3238 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3239 if (!dest_tf_ops) 3240 continue; 3241 3242 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3243 spin_unlock(&dev->se_port_lock); 3244 3245 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3246 pr_err("core_scsi3_tpg_depend_item() failed" 3247 " for dest_se_tpg\n"); 3248 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3249 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3250 goto out_put_pr_reg; 3251 } 3252 3253 spin_lock(&dev->se_port_lock); 3254 break; 3255 } 3256 spin_unlock(&dev->se_port_lock); 3257 3258 if (!dest_se_tpg || !dest_tf_ops) { 3259 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3260 " fabric ops from Relative Target Port Identifier:" 3261 " %hu\n", rtpi); 3262 ret = TCM_INVALID_PARAMETER_LIST; 3263 goto out_put_pr_reg; 3264 } 3265 3266 buf = transport_kmap_data_sg(cmd); 3267 if (!buf) { 3268 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3269 goto out_put_pr_reg; 3270 } 3271 proto_ident = (buf[24] & 0x0f); 3272 3273 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3274 " 0x%02x\n", proto_ident); 3275 3276 if (proto_ident != dest_se_tpg->proto_id) { 3277 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3278 " proto_ident: 0x%02x does not match ident: 0x%02x" 3279 " from fabric: %s\n", proto_ident, 3280 dest_se_tpg->proto_id, 3281 dest_tf_ops->fabric_name); 3282 ret = TCM_INVALID_PARAMETER_LIST; 3283 goto out; 3284 } 3285 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3286 &buf[24], &tmp_tid_len, &iport_ptr); 3287 if (!initiator_str) { 3288 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3289 " initiator_str from Transport ID\n"); 3290 ret = TCM_INVALID_PARAMETER_LIST; 3291 goto out; 3292 } 3293 3294 transport_kunmap_data_sg(cmd); 3295 buf = NULL; 3296 3297 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3298 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? 3299 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3300 iport_ptr : ""); 3301 /* 3302 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3303 * action specifies a TransportID that is the same as the initiator port 3304 * of the I_T nexus for the command received, then the command shall 3305 * be terminated with CHECK CONDITION status, with the sense key set to 3306 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3307 * IN PARAMETER LIST. 3308 */ 3309 pr_reg_nacl = pr_reg->pr_reg_nacl; 3310 matching_iname = (!strcmp(initiator_str, 3311 pr_reg_nacl->initiatorname)) ? 1 : 0; 3312 if (!matching_iname) 3313 goto after_iport_check; 3314 3315 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3316 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3317 " matches: %s on received I_T Nexus\n", initiator_str, 3318 pr_reg_nacl->initiatorname); 3319 ret = TCM_INVALID_PARAMETER_LIST; 3320 goto out; 3321 } 3322 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3323 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3324 " matches: %s %s on received I_T Nexus\n", 3325 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3326 pr_reg->pr_reg_isid); 3327 ret = TCM_INVALID_PARAMETER_LIST; 3328 goto out; 3329 } 3330 after_iport_check: 3331 /* 3332 * Locate the destination struct se_node_acl from the received Transport ID 3333 */ 3334 mutex_lock(&dest_se_tpg->acl_node_mutex); 3335 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3336 initiator_str); 3337 if (dest_node_acl) 3338 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3339 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3340 3341 if (!dest_node_acl) { 3342 pr_err("Unable to locate %s dest_node_acl for" 3343 " TransportID%s\n", dest_tf_ops->fabric_name, 3344 initiator_str); 3345 ret = TCM_INVALID_PARAMETER_LIST; 3346 goto out; 3347 } 3348 3349 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3350 pr_err("core_scsi3_nodeacl_depend_item() for" 3351 " dest_node_acl\n"); 3352 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3353 dest_node_acl = NULL; 3354 ret = TCM_INVALID_PARAMETER_LIST; 3355 goto out; 3356 } 3357 3358 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3359 " %s from TransportID\n", dest_tf_ops->fabric_name, 3360 dest_node_acl->initiatorname); 3361 3362 /* 3363 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3364 * PORT IDENTIFIER. 3365 */ 3366 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3367 if (!dest_se_deve) { 3368 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3369 " %hu\n", dest_tf_ops->fabric_name, rtpi); 3370 ret = TCM_INVALID_PARAMETER_LIST; 3371 goto out; 3372 } 3373 3374 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3375 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3376 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3377 dest_se_deve = NULL; 3378 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3379 goto out; 3380 } 3381 3382 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3383 " ACL for dest_se_deve->mapped_lun: %llu\n", 3384 dest_tf_ops->fabric_name, dest_node_acl->initiatorname, 3385 dest_se_deve->mapped_lun); 3386 3387 /* 3388 * A persistent reservation needs to already existing in order to 3389 * successfully complete the REGISTER_AND_MOVE service action.. 3390 */ 3391 spin_lock(&dev->dev_reservation_lock); 3392 pr_res_holder = dev->dev_pr_res_holder; 3393 if (!pr_res_holder) { 3394 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3395 " currently held\n"); 3396 spin_unlock(&dev->dev_reservation_lock); 3397 ret = TCM_INVALID_CDB_FIELD; 3398 goto out; 3399 } 3400 /* 3401 * The received on I_T Nexus must be the reservation holder. 3402 * 3403 * From spc4r17 section 5.7.8 Table 50 -- 3404 * Register behaviors for a REGISTER AND MOVE service action 3405 */ 3406 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3407 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3408 " Nexus is not reservation holder\n"); 3409 spin_unlock(&dev->dev_reservation_lock); 3410 ret = TCM_RESERVATION_CONFLICT; 3411 goto out; 3412 } 3413 /* 3414 * From spc4r17 section 5.7.8: registering and moving reservation 3415 * 3416 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3417 * action is received and the established persistent reservation is a 3418 * Write Exclusive - All Registrants type or Exclusive Access - 3419 * All Registrants type reservation, then the command shall be completed 3420 * with RESERVATION CONFLICT status. 3421 */ 3422 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3423 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3424 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3425 " reservation for type: %s\n", 3426 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3427 spin_unlock(&dev->dev_reservation_lock); 3428 ret = TCM_RESERVATION_CONFLICT; 3429 goto out; 3430 } 3431 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3432 /* 3433 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3434 */ 3435 type = pr_res_holder->pr_res_type; 3436 scope = pr_res_holder->pr_res_type; 3437 /* 3438 * c) Associate the reservation key specified in the SERVICE ACTION 3439 * RESERVATION KEY field with the I_T nexus specified as the 3440 * destination of the register and move, where: 3441 * A) The I_T nexus is specified by the TransportID and the 3442 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3443 * B) Regardless of the TransportID format used, the association for 3444 * the initiator port is based on either the initiator port name 3445 * (see 3.1.71) on SCSI transport protocols where port names are 3446 * required or the initiator port identifier (see 3.1.70) on SCSI 3447 * transport protocols where port names are not required; 3448 * d) Register the reservation key specified in the SERVICE ACTION 3449 * RESERVATION KEY field; 3450 * e) Retain the reservation key specified in the SERVICE ACTION 3451 * RESERVATION KEY field and associated information; 3452 * 3453 * Also, It is not an error for a REGISTER AND MOVE service action to 3454 * register an I_T nexus that is already registered with the same 3455 * reservation key or a different reservation key. 3456 */ 3457 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3458 iport_ptr); 3459 if (!dest_pr_reg) { 3460 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3461 kref_read(&dest_se_deve->pr_kref) != 0); 3462 3463 spin_unlock(&dev->dev_reservation_lock); 3464 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3465 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3466 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3467 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3468 goto out; 3469 } 3470 spin_lock(&dev->dev_reservation_lock); 3471 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3472 iport_ptr); 3473 new_reg = 1; 3474 } 3475 /* 3476 * f) Release the persistent reservation for the persistent reservation 3477 * holder (i.e., the I_T nexus on which the 3478 */ 3479 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3480 dev->dev_pr_res_holder, 0, 0); 3481 /* 3482 * g) Move the persistent reservation to the specified I_T nexus using 3483 * the same scope and type as the persistent reservation released in 3484 * item f); and 3485 */ 3486 dev->dev_pr_res_holder = dest_pr_reg; 3487 dest_pr_reg->pr_res_holder = 1; 3488 dest_pr_reg->pr_res_type = type; 3489 pr_reg->pr_res_scope = scope; 3490 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3491 /* 3492 * Increment PRGeneration for existing registrations.. 3493 */ 3494 if (!new_reg) 3495 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3496 spin_unlock(&dev->dev_reservation_lock); 3497 3498 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3499 " created new reservation holder TYPE: %s on object RTPI:" 3500 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, 3501 core_scsi3_pr_dump_type(type), rtpi, 3502 dest_pr_reg->pr_res_generation); 3503 pr_debug("SPC-3 PR Successfully moved reservation from" 3504 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3505 tf_ops->fabric_name, pr_reg_nacl->initiatorname, 3506 i_buf, dest_tf_ops->fabric_name, 3507 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3508 iport_ptr : ""); 3509 /* 3510 * It is now safe to release configfs group dependencies for destination 3511 * of Transport ID Initiator Device/Port Identifier 3512 */ 3513 core_scsi3_lunacl_undepend_item(dest_se_deve); 3514 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3515 core_scsi3_tpg_undepend_item(dest_se_tpg); 3516 /* 3517 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3518 * nexus on which PERSISTENT RESERVE OUT command was received. 3519 */ 3520 if (unreg) { 3521 spin_lock(&pr_tmpl->registration_lock); 3522 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3523 spin_unlock(&pr_tmpl->registration_lock); 3524 } else 3525 core_scsi3_put_pr_reg(pr_reg); 3526 3527 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3528 3529 core_scsi3_put_pr_reg(dest_pr_reg); 3530 return 0; 3531 out: 3532 if (buf) 3533 transport_kunmap_data_sg(cmd); 3534 if (dest_se_deve) 3535 core_scsi3_lunacl_undepend_item(dest_se_deve); 3536 if (dest_node_acl) 3537 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3538 core_scsi3_tpg_undepend_item(dest_se_tpg); 3539 3540 out_put_pr_reg: 3541 core_scsi3_put_pr_reg(pr_reg); 3542 return ret; 3543 } 3544 3545 /* 3546 * See spc4r17 section 6.14 Table 170 3547 */ 3548 sense_reason_t 3549 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3550 { 3551 struct se_device *dev = cmd->se_dev; 3552 unsigned char *cdb = &cmd->t_task_cdb[0]; 3553 unsigned char *buf; 3554 u64 res_key, sa_res_key; 3555 int sa, scope, type, aptpl; 3556 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3557 sense_reason_t ret; 3558 3559 /* 3560 * Following spc2r20 5.5.1 Reservations overview: 3561 * 3562 * If a logical unit has been reserved by any RESERVE command and is 3563 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3564 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3565 * initiator or service action and shall terminate with a RESERVATION 3566 * CONFLICT status. 3567 */ 3568 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3569 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3570 " SPC-2 reservation is held, returning" 3571 " RESERVATION_CONFLICT\n"); 3572 return TCM_RESERVATION_CONFLICT; 3573 } 3574 3575 /* 3576 * FIXME: A NULL struct se_session pointer means an this is not coming from 3577 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3578 */ 3579 if (!cmd->se_sess) 3580 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3581 3582 if (cmd->data_length < 24) { 3583 pr_warn("SPC-PR: Received PR OUT parameter list" 3584 " length too small: %u\n", cmd->data_length); 3585 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3586 } 3587 3588 /* 3589 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3590 */ 3591 sa = (cdb[1] & 0x1f); 3592 scope = (cdb[2] & 0xf0); 3593 type = (cdb[2] & 0x0f); 3594 3595 buf = transport_kmap_data_sg(cmd); 3596 if (!buf) 3597 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3598 3599 /* 3600 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3601 */ 3602 res_key = get_unaligned_be64(&buf[0]); 3603 sa_res_key = get_unaligned_be64(&buf[8]); 3604 /* 3605 * REGISTER_AND_MOVE uses a different SA parameter list containing 3606 * SCSI TransportIDs. 3607 */ 3608 if (sa != PRO_REGISTER_AND_MOVE) { 3609 spec_i_pt = (buf[20] & 0x08); 3610 all_tg_pt = (buf[20] & 0x04); 3611 aptpl = (buf[20] & 0x01); 3612 } else { 3613 aptpl = (buf[17] & 0x01); 3614 unreg = (buf[17] & 0x02); 3615 } 3616 /* 3617 * If the backend device has been configured to force APTPL metadata 3618 * write-out, go ahead and propigate aptpl=1 down now. 3619 */ 3620 if (dev->dev_attrib.force_pr_aptpl) 3621 aptpl = 1; 3622 3623 transport_kunmap_data_sg(cmd); 3624 buf = NULL; 3625 3626 /* 3627 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3628 */ 3629 if (spec_i_pt && (sa != PRO_REGISTER)) 3630 return TCM_INVALID_PARAMETER_LIST; 3631 3632 /* 3633 * From spc4r17 section 6.14: 3634 * 3635 * If the SPEC_I_PT bit is set to zero, the service action is not 3636 * REGISTER AND MOVE, and the parameter list length is not 24, then 3637 * the command shall be terminated with CHECK CONDITION status, with 3638 * the sense key set to ILLEGAL REQUEST, and the additional sense 3639 * code set to PARAMETER LIST LENGTH ERROR. 3640 */ 3641 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3642 (cmd->data_length != 24)) { 3643 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3644 " list length: %u\n", cmd->data_length); 3645 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3646 } 3647 3648 /* 3649 * (core_scsi3_emulate_pro_* function parameters 3650 * are defined by spc4r17 Table 174: 3651 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3652 */ 3653 switch (sa) { 3654 case PRO_REGISTER: 3655 ret = core_scsi3_emulate_pro_register(cmd, 3656 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3657 break; 3658 case PRO_RESERVE: 3659 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3660 break; 3661 case PRO_RELEASE: 3662 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3663 break; 3664 case PRO_CLEAR: 3665 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3666 break; 3667 case PRO_PREEMPT: 3668 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3669 res_key, sa_res_key, PREEMPT); 3670 break; 3671 case PRO_PREEMPT_AND_ABORT: 3672 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3673 res_key, sa_res_key, PREEMPT_AND_ABORT); 3674 break; 3675 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3676 ret = core_scsi3_emulate_pro_register(cmd, 3677 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3678 break; 3679 case PRO_REGISTER_AND_MOVE: 3680 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3681 sa_res_key, aptpl, unreg); 3682 break; 3683 default: 3684 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3685 " action: 0x%02x\n", sa); 3686 return TCM_INVALID_CDB_FIELD; 3687 } 3688 3689 if (!ret) 3690 target_complete_cmd(cmd, GOOD); 3691 return ret; 3692 } 3693 3694 /* 3695 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3696 * 3697 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3698 */ 3699 static sense_reason_t 3700 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3701 { 3702 struct se_device *dev = cmd->se_dev; 3703 struct t10_pr_registration *pr_reg; 3704 unsigned char *buf; 3705 u32 add_len = 0, off = 8; 3706 3707 if (cmd->data_length < 8) { 3708 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3709 " too small\n", cmd->data_length); 3710 return TCM_INVALID_CDB_FIELD; 3711 } 3712 3713 buf = transport_kmap_data_sg(cmd); 3714 if (!buf) 3715 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3716 3717 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3718 3719 spin_lock(&dev->t10_pr.registration_lock); 3720 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3721 pr_reg_list) { 3722 /* 3723 * Check for overflow of 8byte PRI READ_KEYS payload and 3724 * next reservation key list descriptor. 3725 */ 3726 if (off + 8 <= cmd->data_length) { 3727 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3728 off += 8; 3729 } 3730 /* 3731 * SPC5r17: 6.16.2 READ KEYS service action 3732 * The ADDITIONAL LENGTH field indicates the number of bytes in 3733 * the Reservation key list. The contents of the ADDITIONAL 3734 * LENGTH field are not altered based on the allocation length 3735 */ 3736 add_len += 8; 3737 } 3738 spin_unlock(&dev->t10_pr.registration_lock); 3739 3740 put_unaligned_be32(add_len, &buf[4]); 3741 3742 transport_kunmap_data_sg(cmd); 3743 3744 return 0; 3745 } 3746 3747 /* 3748 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3749 * 3750 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3751 */ 3752 static sense_reason_t 3753 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3754 { 3755 struct se_device *dev = cmd->se_dev; 3756 struct t10_pr_registration *pr_reg; 3757 unsigned char *buf; 3758 u64 pr_res_key; 3759 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3760 3761 if (cmd->data_length < 8) { 3762 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3763 " too small\n", cmd->data_length); 3764 return TCM_INVALID_CDB_FIELD; 3765 } 3766 3767 buf = transport_kmap_data_sg(cmd); 3768 if (!buf) 3769 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3770 3771 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3772 3773 spin_lock(&dev->dev_reservation_lock); 3774 pr_reg = dev->dev_pr_res_holder; 3775 if (pr_reg) { 3776 /* 3777 * Set the hardcoded Additional Length 3778 */ 3779 put_unaligned_be32(add_len, &buf[4]); 3780 3781 if (cmd->data_length < 22) 3782 goto err; 3783 3784 /* 3785 * Set the Reservation key. 3786 * 3787 * From spc4r17, section 5.7.10: 3788 * A persistent reservation holder has its reservation key 3789 * returned in the parameter data from a PERSISTENT 3790 * RESERVE IN command with READ RESERVATION service action as 3791 * follows: 3792 * a) For a persistent reservation of the type Write Exclusive 3793 * - All Registrants or Exclusive Access All Regitrants, 3794 * the reservation key shall be set to zero; or 3795 * b) For all other persistent reservation types, the 3796 * reservation key shall be set to the registered 3797 * reservation key for the I_T nexus that holds the 3798 * persistent reservation. 3799 */ 3800 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3801 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3802 pr_res_key = 0; 3803 else 3804 pr_res_key = pr_reg->pr_res_key; 3805 3806 put_unaligned_be64(pr_res_key, &buf[8]); 3807 /* 3808 * Set the SCOPE and TYPE 3809 */ 3810 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3811 (pr_reg->pr_res_type & 0x0f); 3812 } 3813 3814 err: 3815 spin_unlock(&dev->dev_reservation_lock); 3816 transport_kunmap_data_sg(cmd); 3817 3818 return 0; 3819 } 3820 3821 /* 3822 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3823 * 3824 * See spc4r17 section 6.13.4 Table 165 3825 */ 3826 static sense_reason_t 3827 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3828 { 3829 struct se_device *dev = cmd->se_dev; 3830 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3831 unsigned char *buf; 3832 u16 add_len = 8; /* Hardcoded to 8. */ 3833 3834 if (cmd->data_length < 6) { 3835 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3836 " %u too small\n", cmd->data_length); 3837 return TCM_INVALID_CDB_FIELD; 3838 } 3839 3840 buf = transport_kmap_data_sg(cmd); 3841 if (!buf) 3842 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3843 3844 put_unaligned_be16(add_len, &buf[0]); 3845 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3846 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3847 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3848 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3849 /* 3850 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3851 * set the TMV: Task Mask Valid bit. 3852 */ 3853 buf[3] |= 0x80; 3854 /* 3855 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3856 */ 3857 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3858 /* 3859 * PTPL_A: Persistence across Target Power Loss Active bit 3860 */ 3861 if (pr_tmpl->pr_aptpl_active) 3862 buf[3] |= 0x01; 3863 /* 3864 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3865 */ 3866 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3867 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3868 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3869 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3870 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3871 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3872 3873 transport_kunmap_data_sg(cmd); 3874 3875 return 0; 3876 } 3877 3878 /* 3879 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3880 * 3881 * See spc4r17 section 6.13.5 Table 168 and 169 3882 */ 3883 static sense_reason_t 3884 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3885 { 3886 struct se_device *dev = cmd->se_dev; 3887 struct se_node_acl *se_nacl; 3888 struct se_portal_group *se_tpg; 3889 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3890 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3891 unsigned char *buf; 3892 u32 add_desc_len = 0, add_len = 0; 3893 u32 off = 8; /* off into first Full Status descriptor */ 3894 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3895 int exp_desc_len, desc_len; 3896 bool all_reg = false; 3897 3898 if (cmd->data_length < 8) { 3899 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3900 " too small\n", cmd->data_length); 3901 return TCM_INVALID_CDB_FIELD; 3902 } 3903 3904 buf = transport_kmap_data_sg(cmd); 3905 if (!buf) 3906 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3907 3908 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3909 3910 spin_lock(&dev->dev_reservation_lock); 3911 if (dev->dev_pr_res_holder) { 3912 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3913 3914 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3915 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3916 all_reg = true; 3917 pr_res_type = pr_holder->pr_res_type; 3918 pr_res_scope = pr_holder->pr_res_scope; 3919 } 3920 } 3921 spin_unlock(&dev->dev_reservation_lock); 3922 3923 spin_lock(&pr_tmpl->registration_lock); 3924 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3925 &pr_tmpl->registration_list, pr_reg_list) { 3926 3927 se_nacl = pr_reg->pr_reg_nacl; 3928 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3929 add_desc_len = 0; 3930 3931 atomic_inc_mb(&pr_reg->pr_res_holders); 3932 spin_unlock(&pr_tmpl->registration_lock); 3933 /* 3934 * Determine expected length of $FABRIC_MOD specific 3935 * TransportID full status descriptor.. 3936 */ 3937 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3938 &format_code); 3939 if (exp_desc_len < 0 || 3940 exp_desc_len + add_len > cmd->data_length) { 3941 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3942 " out of buffer: %d\n", cmd->data_length); 3943 spin_lock(&pr_tmpl->registration_lock); 3944 atomic_dec_mb(&pr_reg->pr_res_holders); 3945 break; 3946 } 3947 /* 3948 * Set RESERVATION KEY 3949 */ 3950 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3951 off += 8; 3952 off += 4; /* Skip Over Reserved area */ 3953 3954 /* 3955 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3956 */ 3957 if (pr_reg->pr_reg_all_tg_pt) 3958 buf[off] = 0x02; 3959 /* 3960 * The struct se_lun pointer will be present for the 3961 * reservation holder for PR_HOLDER bit. 3962 * 3963 * Also, if this registration is the reservation 3964 * holder or there is an All Registrants reservation 3965 * active, fill in SCOPE and TYPE in the next byte. 3966 */ 3967 if (pr_reg->pr_res_holder) { 3968 buf[off++] |= 0x01; 3969 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3970 (pr_reg->pr_res_type & 0x0f); 3971 } else if (all_reg) { 3972 buf[off++] |= 0x01; 3973 buf[off++] = (pr_res_scope & 0xf0) | 3974 (pr_res_type & 0x0f); 3975 } else { 3976 off += 2; 3977 } 3978 3979 off += 4; /* Skip over reserved area */ 3980 /* 3981 * From spc4r17 6.3.15: 3982 * 3983 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3984 * IDENTIFIER field contains the relative port identifier (see 3985 * 3.1.120) of the target port that is part of the I_T nexus 3986 * described by this full status descriptor. If the ALL_TG_PT 3987 * bit is set to one, the contents of the RELATIVE TARGET PORT 3988 * IDENTIFIER field are not defined by this standard. 3989 */ 3990 if (!pr_reg->pr_reg_all_tg_pt) { 3991 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 3992 3993 put_unaligned_be16(sep_rtpi, &buf[off]); 3994 off += 2; 3995 } else 3996 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3997 3998 buf[off+4] = se_tpg->proto_id; 3999 4000 /* 4001 * Now, have the $FABRIC_MOD fill in the transport ID. 4002 */ 4003 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4004 &format_code, &buf[off+4]); 4005 4006 spin_lock(&pr_tmpl->registration_lock); 4007 atomic_dec_mb(&pr_reg->pr_res_holders); 4008 4009 if (desc_len < 0) 4010 break; 4011 /* 4012 * Set the ADDITIONAL DESCRIPTOR LENGTH 4013 */ 4014 put_unaligned_be32(desc_len, &buf[off]); 4015 off += 4; 4016 /* 4017 * Size of full desctipor header minus TransportID 4018 * containing $FABRIC_MOD specific) initiator device/port 4019 * WWN information. 4020 * 4021 * See spc4r17 Section 6.13.5 Table 169 4022 */ 4023 add_desc_len = (24 + desc_len); 4024 4025 off += desc_len; 4026 add_len += add_desc_len; 4027 } 4028 spin_unlock(&pr_tmpl->registration_lock); 4029 /* 4030 * Set ADDITIONAL_LENGTH 4031 */ 4032 put_unaligned_be32(add_len, &buf[4]); 4033 4034 transport_kunmap_data_sg(cmd); 4035 4036 return 0; 4037 } 4038 4039 sense_reason_t 4040 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4041 { 4042 sense_reason_t ret; 4043 4044 /* 4045 * Following spc2r20 5.5.1 Reservations overview: 4046 * 4047 * If a logical unit has been reserved by any RESERVE command and is 4048 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4049 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4050 * initiator or service action and shall terminate with a RESERVATION 4051 * CONFLICT status. 4052 */ 4053 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4054 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4055 " SPC-2 reservation is held, returning" 4056 " RESERVATION_CONFLICT\n"); 4057 return TCM_RESERVATION_CONFLICT; 4058 } 4059 4060 switch (cmd->t_task_cdb[1] & 0x1f) { 4061 case PRI_READ_KEYS: 4062 ret = core_scsi3_pri_read_keys(cmd); 4063 break; 4064 case PRI_READ_RESERVATION: 4065 ret = core_scsi3_pri_read_reservation(cmd); 4066 break; 4067 case PRI_REPORT_CAPABILITIES: 4068 ret = core_scsi3_pri_report_capabilities(cmd); 4069 break; 4070 case PRI_READ_FULL_STATUS: 4071 ret = core_scsi3_pri_read_full_status(cmd); 4072 break; 4073 default: 4074 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4075 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4076 return TCM_INVALID_CDB_FIELD; 4077 } 4078 4079 if (!ret) 4080 target_complete_cmd(cmd, GOOD); 4081 return ret; 4082 } 4083 4084 sense_reason_t 4085 target_check_reservation(struct se_cmd *cmd) 4086 { 4087 struct se_device *dev = cmd->se_dev; 4088 sense_reason_t ret; 4089 4090 if (!cmd->se_sess) 4091 return 0; 4092 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4093 return 0; 4094 if (!dev->dev_attrib.emulate_pr) 4095 return 0; 4096 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4097 return 0; 4098 4099 spin_lock(&dev->dev_reservation_lock); 4100 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4101 ret = target_scsi2_reservation_check(cmd); 4102 else 4103 ret = target_scsi3_pr_reservation_check(cmd); 4104 spin_unlock(&dev->dev_reservation_lock); 4105 4106 return ret; 4107 } 4108