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