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