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