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