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 READ_CAPACITY: 474 case REPORT_LUNS: 475 case REQUEST_SENSE: 476 case PERSISTENT_RESERVE_IN: 477 ret = 0; /*/ Allowed CDBs */ 478 break; 479 default: 480 other_cdb = 1; 481 break; 482 } 483 /* 484 * Case where the CDB is explicitly allowed in the above switch 485 * statement. 486 */ 487 if (!ret && !other_cdb) { 488 pr_debug("Allowing explicit CDB: 0x%02x for %s" 489 " reservation holder\n", cdb[0], 490 core_scsi3_pr_dump_type(pr_reg_type)); 491 492 return ret; 493 } 494 /* 495 * Check if write exclusive initiator ports *NOT* holding the 496 * WRITE_EXCLUSIVE_* reservation. 497 */ 498 if (we && !registered_nexus) { 499 if (cmd->data_direction == DMA_TO_DEVICE) { 500 /* 501 * Conflict for write exclusive 502 */ 503 pr_debug("%s Conflict for unregistered nexus" 504 " %s CDB: 0x%02x to %s reservation\n", 505 transport_dump_cmd_direction(cmd), 506 se_sess->se_node_acl->initiatorname, cdb[0], 507 core_scsi3_pr_dump_type(pr_reg_type)); 508 return 1; 509 } else { 510 /* 511 * Allow non WRITE CDBs for all Write Exclusive 512 * PR TYPEs to pass for registered and 513 * non-registered_nexuxes NOT holding the reservation. 514 * 515 * We only make noise for the unregisterd nexuses, 516 * as we expect registered non-reservation holding 517 * nexuses to issue CDBs. 518 */ 519 520 if (!registered_nexus) { 521 pr_debug("Allowing implicit CDB: 0x%02x" 522 " for %s reservation on unregistered" 523 " nexus\n", cdb[0], 524 core_scsi3_pr_dump_type(pr_reg_type)); 525 } 526 527 return 0; 528 } 529 } else if ((reg_only) || (all_reg)) { 530 if (registered_nexus) { 531 /* 532 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 533 * allow commands from registered nexuses. 534 */ 535 536 pr_debug("Allowing implicit CDB: 0x%02x for %s" 537 " reservation\n", cdb[0], 538 core_scsi3_pr_dump_type(pr_reg_type)); 539 540 return 0; 541 } 542 } else if (we && registered_nexus) { 543 /* 544 * Reads are allowed for Write Exclusive locks 545 * from all registrants. 546 */ 547 if (cmd->data_direction == DMA_FROM_DEVICE) { 548 pr_debug("Allowing READ CDB: 0x%02x for %s" 549 " reservation\n", cdb[0], 550 core_scsi3_pr_dump_type(pr_reg_type)); 551 552 return 0; 553 } 554 } 555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 556 " for %s reservation\n", transport_dump_cmd_direction(cmd), 557 (registered_nexus) ? "" : "un", 558 se_sess->se_node_acl->initiatorname, cdb[0], 559 core_scsi3_pr_dump_type(pr_reg_type)); 560 561 return 1; /* Conflict by default */ 562 } 563 564 static sense_reason_t 565 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 566 { 567 struct se_device *dev = cmd->se_dev; 568 struct se_session *sess = cmd->se_sess; 569 u32 pr_reg_type; 570 bool isid_mismatch = false; 571 572 if (!dev->dev_pr_res_holder) 573 return 0; 574 575 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 576 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 577 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 578 goto check_nonholder; 579 580 if (dev->dev_pr_res_holder->isid_present_at_reg) { 581 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 582 sess->sess_bin_isid) { 583 isid_mismatch = true; 584 goto check_nonholder; 585 } 586 } 587 588 return 0; 589 590 check_nonholder: 591 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 592 return TCM_RESERVATION_CONFLICT; 593 return 0; 594 } 595 596 static u32 core_scsi3_pr_generation(struct se_device *dev) 597 { 598 u32 prg; 599 600 /* 601 * PRGeneration field shall contain the value of a 32-bit wrapping 602 * counter mainted by the device server. 603 * 604 * Note that this is done regardless of Active Persist across 605 * Target PowerLoss (APTPL) 606 * 607 * See spc4r17 section 6.3.12 READ_KEYS service action 608 */ 609 spin_lock(&dev->dev_reservation_lock); 610 prg = dev->t10_pr.pr_generation++; 611 spin_unlock(&dev->dev_reservation_lock); 612 613 return prg; 614 } 615 616 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 617 struct se_device *dev, 618 struct se_node_acl *nacl, 619 struct se_lun *lun, 620 struct se_dev_entry *dest_deve, 621 u64 mapped_lun, 622 unsigned char *isid, 623 u64 sa_res_key, 624 int all_tg_pt, 625 int aptpl) 626 { 627 struct t10_pr_registration *pr_reg; 628 629 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 630 if (!pr_reg) { 631 pr_err("Unable to allocate struct t10_pr_registration\n"); 632 return NULL; 633 } 634 635 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 636 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 637 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 640 atomic_set(&pr_reg->pr_res_holders, 0); 641 pr_reg->pr_reg_nacl = nacl; 642 /* 643 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 644 * the se_dev_entry->pr_ref will have been already obtained by 645 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 646 * 647 * Otherwise, locate se_dev_entry now and obtain a reference until 648 * registration completes in __core_scsi3_add_registration(). 649 */ 650 if (dest_deve) { 651 pr_reg->pr_reg_deve = dest_deve; 652 } else { 653 rcu_read_lock(); 654 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 655 if (!pr_reg->pr_reg_deve) { 656 rcu_read_unlock(); 657 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 658 nacl->initiatorname, mapped_lun); 659 kmem_cache_free(t10_pr_reg_cache, pr_reg); 660 return NULL; 661 } 662 kref_get(&pr_reg->pr_reg_deve->pr_kref); 663 rcu_read_unlock(); 664 } 665 pr_reg->pr_res_mapped_lun = mapped_lun; 666 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 667 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 668 pr_reg->pr_res_key = sa_res_key; 669 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 670 pr_reg->pr_reg_aptpl = aptpl; 671 /* 672 * If an ISID value for this SCSI Initiator Port exists, 673 * save it to the registration now. 674 */ 675 if (isid != NULL) { 676 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 677 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 678 pr_reg->isid_present_at_reg = 1; 679 } 680 681 return pr_reg; 682 } 683 684 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 685 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 686 687 /* 688 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 689 * modes. 690 */ 691 static struct t10_pr_registration *__core_scsi3_alloc_registration( 692 struct se_device *dev, 693 struct se_node_acl *nacl, 694 struct se_lun *lun, 695 struct se_dev_entry *deve, 696 u64 mapped_lun, 697 unsigned char *isid, 698 u64 sa_res_key, 699 int all_tg_pt, 700 int aptpl) 701 { 702 struct se_dev_entry *deve_tmp; 703 struct se_node_acl *nacl_tmp; 704 struct se_lun_acl *lacl_tmp; 705 struct se_lun *lun_tmp, *next, *dest_lun; 706 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 707 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 708 int ret; 709 /* 710 * Create a registration for the I_T Nexus upon which the 711 * PROUT REGISTER was received. 712 */ 713 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 714 isid, sa_res_key, all_tg_pt, 715 aptpl); 716 if (!pr_reg) 717 return NULL; 718 /* 719 * Return pointer to pr_reg for ALL_TG_PT=0 720 */ 721 if (!all_tg_pt) 722 return pr_reg; 723 /* 724 * Create list of matching SCSI Initiator Port registrations 725 * for ALL_TG_PT=1 726 */ 727 spin_lock(&dev->se_port_lock); 728 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 729 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 730 continue; 731 spin_unlock(&dev->se_port_lock); 732 733 spin_lock(&lun_tmp->lun_deve_lock); 734 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 735 /* 736 * This pointer will be NULL for demo mode MappedLUNs 737 * that have not been make explicit via a ConfigFS 738 * MappedLUN group for the SCSI Initiator Node ACL. 739 */ 740 if (!deve_tmp->se_lun_acl) 741 continue; 742 743 lacl_tmp = deve_tmp->se_lun_acl; 744 nacl_tmp = lacl_tmp->se_lun_nacl; 745 /* 746 * Skip the matching struct se_node_acl that is allocated 747 * above.. 748 */ 749 if (nacl == nacl_tmp) 750 continue; 751 /* 752 * Only perform PR registrations for target ports on 753 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 754 * arrived. 755 */ 756 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 757 continue; 758 /* 759 * Look for a matching Initiator Node ACL in ASCII format 760 */ 761 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 762 continue; 763 764 kref_get(&deve_tmp->pr_kref); 765 spin_unlock(&lun_tmp->lun_deve_lock); 766 /* 767 * Grab a configfs group dependency that is released 768 * for the exception path at label out: below, or upon 769 * completion of adding ALL_TG_PT=1 registrations in 770 * __core_scsi3_add_registration() 771 */ 772 ret = core_scsi3_lunacl_depend_item(deve_tmp); 773 if (ret < 0) { 774 pr_err("core_scsi3_lunacl_depend" 775 "_item() failed\n"); 776 percpu_ref_put(&lun_tmp->lun_ref); 777 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 778 goto out; 779 } 780 /* 781 * Located a matching SCSI Initiator Port on a different 782 * port, allocate the pr_reg_atp and attach it to the 783 * pr_reg->pr_reg_atp_list that will be processed once 784 * the original *pr_reg is processed in 785 * __core_scsi3_add_registration() 786 */ 787 dest_lun = deve_tmp->se_lun; 788 789 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 790 nacl_tmp, dest_lun, deve_tmp, 791 deve_tmp->mapped_lun, NULL, 792 sa_res_key, all_tg_pt, aptpl); 793 if (!pr_reg_atp) { 794 percpu_ref_put(&lun_tmp->lun_ref); 795 core_scsi3_lunacl_undepend_item(deve_tmp); 796 goto out; 797 } 798 799 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 800 &pr_reg->pr_reg_atp_list); 801 spin_lock(&lun_tmp->lun_deve_lock); 802 } 803 spin_unlock(&lun_tmp->lun_deve_lock); 804 805 spin_lock(&dev->se_port_lock); 806 percpu_ref_put(&lun_tmp->lun_ref); 807 } 808 spin_unlock(&dev->se_port_lock); 809 810 return pr_reg; 811 out: 812 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 813 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 814 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 815 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 816 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 817 } 818 kmem_cache_free(t10_pr_reg_cache, pr_reg); 819 return NULL; 820 } 821 822 int core_scsi3_alloc_aptpl_registration( 823 struct t10_reservation *pr_tmpl, 824 u64 sa_res_key, 825 unsigned char *i_port, 826 unsigned char *isid, 827 u64 mapped_lun, 828 unsigned char *t_port, 829 u16 tpgt, 830 u64 target_lun, 831 int res_holder, 832 int all_tg_pt, 833 u8 type) 834 { 835 struct t10_pr_registration *pr_reg; 836 837 if (!i_port || !t_port || !sa_res_key) { 838 pr_err("Illegal parameters for APTPL registration\n"); 839 return -EINVAL; 840 } 841 842 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 843 if (!pr_reg) { 844 pr_err("Unable to allocate struct t10_pr_registration\n"); 845 return -ENOMEM; 846 } 847 848 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 849 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 850 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 851 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 853 atomic_set(&pr_reg->pr_res_holders, 0); 854 pr_reg->pr_reg_nacl = NULL; 855 pr_reg->pr_reg_deve = NULL; 856 pr_reg->pr_res_mapped_lun = mapped_lun; 857 pr_reg->pr_aptpl_target_lun = target_lun; 858 pr_reg->pr_res_key = sa_res_key; 859 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 860 pr_reg->pr_reg_aptpl = 1; 861 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 862 pr_reg->pr_res_type = type; 863 /* 864 * If an ISID value had been saved in APTPL metadata for this 865 * SCSI Initiator Port, restore it now. 866 */ 867 if (isid != NULL) { 868 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 869 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 870 pr_reg->isid_present_at_reg = 1; 871 } 872 /* 873 * Copy the i_port and t_port information from caller. 874 */ 875 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 876 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 877 pr_reg->pr_reg_tpgt = tpgt; 878 /* 879 * Set pr_res_holder from caller, the pr_reg who is the reservation 880 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 881 * the Initiator Node LUN ACL from the fabric module is created for 882 * this registration. 883 */ 884 pr_reg->pr_res_holder = res_holder; 885 886 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 887 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 888 " metadata\n", (res_holder) ? "+reservation" : ""); 889 return 0; 890 } 891 892 static void core_scsi3_aptpl_reserve( 893 struct se_device *dev, 894 struct se_portal_group *tpg, 895 struct se_node_acl *node_acl, 896 struct t10_pr_registration *pr_reg) 897 { 898 char i_buf[PR_REG_ISID_ID_LEN] = { }; 899 900 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 901 902 spin_lock(&dev->dev_reservation_lock); 903 dev->dev_pr_res_holder = pr_reg; 904 spin_unlock(&dev->dev_reservation_lock); 905 906 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 907 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 908 tpg->se_tpg_tfo->fabric_name, 909 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 910 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 911 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 912 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname, 913 i_buf); 914 } 915 916 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 917 struct t10_pr_registration *, enum register_type, int); 918 919 static int __core_scsi3_check_aptpl_registration( 920 struct se_device *dev, 921 struct se_portal_group *tpg, 922 struct se_lun *lun, 923 u64 target_lun, 924 struct se_node_acl *nacl, 925 u64 mapped_lun) 926 { 927 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 928 struct t10_reservation *pr_tmpl = &dev->t10_pr; 929 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { }; 930 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { }; 931 u16 tpgt; 932 933 /* 934 * Copy Initiator Port information from struct se_node_acl 935 */ 936 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 937 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 938 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 939 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 940 /* 941 * Look for the matching registrations+reservation from those 942 * created from APTPL metadata. Note that multiple registrations 943 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 944 * TransportIDs. 945 */ 946 spin_lock(&pr_tmpl->aptpl_reg_lock); 947 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 948 pr_reg_aptpl_list) { 949 950 if (!strcmp(pr_reg->pr_iport, i_port) && 951 (pr_reg->pr_res_mapped_lun == mapped_lun) && 952 !(strcmp(pr_reg->pr_tport, t_port)) && 953 (pr_reg->pr_reg_tpgt == tpgt) && 954 (pr_reg->pr_aptpl_target_lun == target_lun)) { 955 /* 956 * Obtain the ->pr_reg_deve pointer + reference, that 957 * is released by __core_scsi3_add_registration() below. 958 */ 959 rcu_read_lock(); 960 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 961 if (!pr_reg->pr_reg_deve) { 962 pr_err("Unable to locate PR APTPL %s mapped_lun:" 963 " %llu\n", nacl->initiatorname, mapped_lun); 964 rcu_read_unlock(); 965 continue; 966 } 967 kref_get(&pr_reg->pr_reg_deve->pr_kref); 968 rcu_read_unlock(); 969 970 pr_reg->pr_reg_nacl = nacl; 971 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 972 list_del(&pr_reg->pr_reg_aptpl_list); 973 spin_unlock(&pr_tmpl->aptpl_reg_lock); 974 /* 975 * At this point all of the pointers in *pr_reg will 976 * be setup, so go ahead and add the registration. 977 */ 978 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 979 /* 980 * If this registration is the reservation holder, 981 * make that happen now.. 982 */ 983 if (pr_reg->pr_res_holder) 984 core_scsi3_aptpl_reserve(dev, tpg, 985 nacl, pr_reg); 986 /* 987 * Reenable pr_aptpl_active to accept new metadata 988 * updates once the SCSI device is active again.. 989 */ 990 spin_lock(&pr_tmpl->aptpl_reg_lock); 991 pr_tmpl->pr_aptpl_active = 1; 992 } 993 } 994 spin_unlock(&pr_tmpl->aptpl_reg_lock); 995 996 return 0; 997 } 998 999 int core_scsi3_check_aptpl_registration( 1000 struct se_device *dev, 1001 struct se_portal_group *tpg, 1002 struct se_lun *lun, 1003 struct se_node_acl *nacl, 1004 u64 mapped_lun) 1005 { 1006 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1007 return 0; 1008 1009 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1010 lun->unpacked_lun, nacl, 1011 mapped_lun); 1012 } 1013 1014 static void __core_scsi3_dump_registration( 1015 const struct target_core_fabric_ops *tfo, 1016 struct se_device *dev, 1017 struct se_node_acl *nacl, 1018 struct t10_pr_registration *pr_reg, 1019 enum register_type register_type) 1020 { 1021 struct se_portal_group *se_tpg = nacl->se_tpg; 1022 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1023 1024 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1025 1026 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1027 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ? 1028 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1029 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1030 i_buf); 1031 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1032 tfo->fabric_name, tfo->tpg_get_wwn(se_tpg), 1033 tfo->tpg_get_tag(se_tpg)); 1034 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1035 " Port(s)\n", tfo->fabric_name, 1036 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1037 dev->transport->name); 1038 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1039 " 0x%08x APTPL: %d\n", tfo->fabric_name, 1040 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1041 pr_reg->pr_reg_aptpl); 1042 } 1043 1044 static void __core_scsi3_add_registration( 1045 struct se_device *dev, 1046 struct se_node_acl *nacl, 1047 struct t10_pr_registration *pr_reg, 1048 enum register_type register_type, 1049 int register_move) 1050 { 1051 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1052 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1053 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1054 struct se_dev_entry *deve; 1055 1056 /* 1057 * Increment PRgeneration counter for struct se_device upon a successful 1058 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1059 * 1060 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1061 * action, the struct se_device->dev_reservation_lock will already be held, 1062 * so we do not call core_scsi3_pr_generation() which grabs the lock 1063 * for the REGISTER. 1064 */ 1065 pr_reg->pr_res_generation = (register_move) ? 1066 dev->t10_pr.pr_generation++ : 1067 core_scsi3_pr_generation(dev); 1068 1069 spin_lock(&pr_tmpl->registration_lock); 1070 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1071 1072 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1073 spin_unlock(&pr_tmpl->registration_lock); 1074 /* 1075 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1076 */ 1077 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1078 goto out; 1079 /* 1080 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1081 * allocated in __core_scsi3_alloc_registration() 1082 */ 1083 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1084 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1085 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1086 1087 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1088 1089 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1090 1091 spin_lock(&pr_tmpl->registration_lock); 1092 list_add_tail(&pr_reg_tmp->pr_reg_list, 1093 &pr_tmpl->registration_list); 1094 1095 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1096 register_type); 1097 spin_unlock(&pr_tmpl->registration_lock); 1098 /* 1099 * Drop configfs group dependency reference and deve->pr_kref 1100 * obtained from __core_scsi3_alloc_registration() code. 1101 */ 1102 rcu_read_lock(); 1103 deve = pr_reg_tmp->pr_reg_deve; 1104 if (deve) { 1105 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1106 core_scsi3_lunacl_undepend_item(deve); 1107 pr_reg_tmp->pr_reg_deve = NULL; 1108 } 1109 rcu_read_unlock(); 1110 } 1111 out: 1112 /* 1113 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1114 */ 1115 rcu_read_lock(); 1116 deve = pr_reg->pr_reg_deve; 1117 if (deve) { 1118 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1119 kref_put(&deve->pr_kref, target_pr_kref_release); 1120 pr_reg->pr_reg_deve = NULL; 1121 } 1122 rcu_read_unlock(); 1123 } 1124 1125 static int core_scsi3_alloc_registration( 1126 struct se_device *dev, 1127 struct se_node_acl *nacl, 1128 struct se_lun *lun, 1129 struct se_dev_entry *deve, 1130 u64 mapped_lun, 1131 unsigned char *isid, 1132 u64 sa_res_key, 1133 int all_tg_pt, 1134 int aptpl, 1135 enum register_type register_type, 1136 int register_move) 1137 { 1138 struct t10_pr_registration *pr_reg; 1139 1140 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1141 isid, sa_res_key, all_tg_pt, 1142 aptpl); 1143 if (!pr_reg) 1144 return -EPERM; 1145 1146 __core_scsi3_add_registration(dev, nacl, pr_reg, 1147 register_type, register_move); 1148 return 0; 1149 } 1150 1151 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1152 struct se_device *dev, 1153 struct se_node_acl *nacl, 1154 unsigned char *isid) 1155 { 1156 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1157 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1158 1159 spin_lock(&pr_tmpl->registration_lock); 1160 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1161 &pr_tmpl->registration_list, pr_reg_list) { 1162 /* 1163 * First look for a matching struct se_node_acl 1164 */ 1165 if (pr_reg->pr_reg_nacl != nacl) 1166 continue; 1167 1168 /* 1169 * If this registration does NOT contain a fabric provided 1170 * ISID, then we have found a match. 1171 */ 1172 if (!pr_reg->isid_present_at_reg) { 1173 atomic_inc_mb(&pr_reg->pr_res_holders); 1174 spin_unlock(&pr_tmpl->registration_lock); 1175 return pr_reg; 1176 } 1177 /* 1178 * If the *pr_reg contains a fabric defined ISID for multi-value 1179 * SCSI Initiator Port TransportIDs, then we expect a valid 1180 * matching ISID to be provided by the local SCSI Initiator Port. 1181 */ 1182 if (!isid) 1183 continue; 1184 if (strcmp(isid, pr_reg->pr_reg_isid)) 1185 continue; 1186 1187 atomic_inc_mb(&pr_reg->pr_res_holders); 1188 spin_unlock(&pr_tmpl->registration_lock); 1189 return pr_reg; 1190 } 1191 spin_unlock(&pr_tmpl->registration_lock); 1192 1193 return NULL; 1194 } 1195 1196 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1197 struct se_device *dev, 1198 struct se_node_acl *nacl, 1199 struct se_session *sess) 1200 { 1201 struct se_portal_group *tpg = nacl->se_tpg; 1202 unsigned char buf[PR_REG_ISID_LEN] = { }; 1203 unsigned char *isid_ptr = NULL; 1204 1205 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1206 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1207 PR_REG_ISID_LEN); 1208 isid_ptr = &buf[0]; 1209 } 1210 1211 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1212 } 1213 1214 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1215 { 1216 atomic_dec_mb(&pr_reg->pr_res_holders); 1217 } 1218 1219 static int core_scsi3_check_implicit_release( 1220 struct se_device *dev, 1221 struct t10_pr_registration *pr_reg) 1222 { 1223 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1224 struct t10_pr_registration *pr_res_holder; 1225 int ret = 0; 1226 1227 spin_lock(&dev->dev_reservation_lock); 1228 pr_res_holder = dev->dev_pr_res_holder; 1229 if (!pr_res_holder) { 1230 spin_unlock(&dev->dev_reservation_lock); 1231 return ret; 1232 } 1233 if (pr_res_holder == pr_reg) { 1234 /* 1235 * Perform an implicit RELEASE if the registration that 1236 * is being released is holding the reservation. 1237 * 1238 * From spc4r17, section 5.7.11.1: 1239 * 1240 * e) If the I_T nexus is the persistent reservation holder 1241 * and the persistent reservation is not an all registrants 1242 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1243 * service action or REGISTER AND IGNORE EXISTING KEY 1244 * service action with the SERVICE ACTION RESERVATION KEY 1245 * field set to zero (see 5.7.11.3). 1246 */ 1247 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1248 ret = 1; 1249 /* 1250 * For 'All Registrants' reservation types, all existing 1251 * registrations are still processed as reservation holders 1252 * in core_scsi3_pr_seq_non_holder() after the initial 1253 * reservation holder is implicitly released here. 1254 */ 1255 } else if (pr_reg->pr_reg_all_tg_pt && 1256 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1257 pr_reg->pr_reg_nacl->initiatorname)) && 1258 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1259 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1260 " UNREGISTER while existing reservation with matching" 1261 " key 0x%016Lx is present from another SCSI Initiator" 1262 " Port\n", pr_reg->pr_res_key); 1263 ret = -EPERM; 1264 } 1265 spin_unlock(&dev->dev_reservation_lock); 1266 1267 return ret; 1268 } 1269 1270 static void __core_scsi3_free_registration( 1271 struct se_device *dev, 1272 struct t10_pr_registration *pr_reg, 1273 struct list_head *preempt_and_abort_list, 1274 int dec_holders) 1275 __releases(&pr_tmpl->registration_lock) 1276 __acquires(&pr_tmpl->registration_lock) 1277 { 1278 const struct target_core_fabric_ops *tfo = 1279 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1280 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1281 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1282 struct se_dev_entry *deve; 1283 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1284 1285 lockdep_assert_held(&pr_tmpl->registration_lock); 1286 1287 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1288 1289 if (!list_empty(&pr_reg->pr_reg_list)) 1290 list_del(&pr_reg->pr_reg_list); 1291 /* 1292 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1293 * so call core_scsi3_put_pr_reg() to decrement our reference. 1294 */ 1295 if (dec_holders) 1296 core_scsi3_put_pr_reg(pr_reg); 1297 1298 spin_unlock(&pr_tmpl->registration_lock); 1299 /* 1300 * Wait until all reference from any other I_T nexuses for this 1301 * *pr_reg have been released. Because list_del() is called above, 1302 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1303 * count back to zero, and we release *pr_reg. 1304 */ 1305 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1306 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1307 tfo->fabric_name); 1308 cpu_relax(); 1309 } 1310 1311 rcu_read_lock(); 1312 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1313 if (deve) 1314 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1315 rcu_read_unlock(); 1316 1317 spin_lock(&pr_tmpl->registration_lock); 1318 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1319 " Node: %s%s\n", tfo->fabric_name, 1320 pr_reg->pr_reg_nacl->initiatorname, 1321 i_buf); 1322 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1323 " Port(s)\n", tfo->fabric_name, 1324 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1325 dev->transport->name); 1326 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1327 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, 1328 pr_reg->pr_res_generation); 1329 1330 if (!preempt_and_abort_list) { 1331 pr_reg->pr_reg_deve = NULL; 1332 pr_reg->pr_reg_nacl = NULL; 1333 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1334 return; 1335 } 1336 /* 1337 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1338 * are released once the ABORT_TASK_SET has completed.. 1339 */ 1340 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1341 } 1342 1343 void core_scsi3_free_pr_reg_from_nacl( 1344 struct se_device *dev, 1345 struct se_node_acl *nacl) 1346 { 1347 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1348 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1349 bool free_reg = false; 1350 /* 1351 * If the passed se_node_acl matches the reservation holder, 1352 * release the reservation. 1353 */ 1354 spin_lock(&dev->dev_reservation_lock); 1355 pr_res_holder = dev->dev_pr_res_holder; 1356 if ((pr_res_holder != NULL) && 1357 (pr_res_holder->pr_reg_nacl == nacl)) { 1358 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1359 free_reg = true; 1360 } 1361 spin_unlock(&dev->dev_reservation_lock); 1362 /* 1363 * Release any registration associated with the struct se_node_acl. 1364 */ 1365 spin_lock(&pr_tmpl->registration_lock); 1366 if (pr_res_holder && free_reg) 1367 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1368 1369 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1370 &pr_tmpl->registration_list, pr_reg_list) { 1371 1372 if (pr_reg->pr_reg_nacl != nacl) 1373 continue; 1374 1375 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1376 } 1377 spin_unlock(&pr_tmpl->registration_lock); 1378 } 1379 1380 void core_scsi3_free_all_registrations( 1381 struct se_device *dev) 1382 { 1383 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1384 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1385 1386 spin_lock(&dev->dev_reservation_lock); 1387 pr_res_holder = dev->dev_pr_res_holder; 1388 if (pr_res_holder != NULL) { 1389 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1390 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1391 pr_res_holder, 0, 0); 1392 } 1393 spin_unlock(&dev->dev_reservation_lock); 1394 1395 spin_lock(&pr_tmpl->registration_lock); 1396 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1397 &pr_tmpl->registration_list, pr_reg_list) { 1398 1399 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1400 } 1401 spin_unlock(&pr_tmpl->registration_lock); 1402 1403 spin_lock(&pr_tmpl->aptpl_reg_lock); 1404 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1405 pr_reg_aptpl_list) { 1406 list_del(&pr_reg->pr_reg_aptpl_list); 1407 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1408 } 1409 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1410 } 1411 1412 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1413 { 1414 return target_depend_item(&tpg->tpg_group.cg_item); 1415 } 1416 1417 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1418 { 1419 target_undepend_item(&tpg->tpg_group.cg_item); 1420 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1421 } 1422 1423 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1424 { 1425 if (nacl->dynamic_node_acl) 1426 return 0; 1427 return target_depend_item(&nacl->acl_group.cg_item); 1428 } 1429 1430 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1431 { 1432 if (!nacl->dynamic_node_acl) 1433 target_undepend_item(&nacl->acl_group.cg_item); 1434 atomic_dec_mb(&nacl->acl_pr_ref_count); 1435 } 1436 1437 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1438 { 1439 /* 1440 * For nacl->dynamic_node_acl=1 1441 */ 1442 if (!se_deve->se_lun_acl) 1443 return 0; 1444 1445 return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1446 } 1447 1448 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1449 { 1450 /* 1451 * For nacl->dynamic_node_acl=1 1452 */ 1453 if (!se_deve->se_lun_acl) { 1454 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1455 return; 1456 } 1457 1458 target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1459 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1460 } 1461 1462 static sense_reason_t 1463 core_scsi3_decode_spec_i_port( 1464 struct se_cmd *cmd, 1465 struct se_portal_group *tpg, 1466 unsigned char *l_isid, 1467 u64 sa_res_key, 1468 int all_tg_pt, 1469 int aptpl) 1470 { 1471 struct se_device *dev = cmd->se_dev; 1472 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1473 struct se_session *se_sess = cmd->se_sess; 1474 struct se_node_acl *dest_node_acl = NULL; 1475 struct se_dev_entry *dest_se_deve = NULL; 1476 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1477 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1478 LIST_HEAD(tid_dest_list); 1479 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1480 unsigned char *buf, *ptr, proto_ident; 1481 const unsigned char *i_str = NULL; 1482 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1483 sense_reason_t ret; 1484 u32 tpdl, tid_len = 0; 1485 u32 dest_rtpi = 0; 1486 1487 /* 1488 * Allocate a struct pr_transport_id_holder and setup the 1489 * local_node_acl pointer and add to struct list_head tid_dest_list 1490 * for add registration processing in the loop of tid_dest_list below. 1491 */ 1492 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1493 if (!tidh_new) { 1494 pr_err("Unable to allocate tidh_new\n"); 1495 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1496 } 1497 INIT_LIST_HEAD(&tidh_new->dest_list); 1498 tidh_new->dest_tpg = tpg; 1499 tidh_new->dest_node_acl = se_sess->se_node_acl; 1500 1501 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1502 se_sess->se_node_acl, cmd->se_lun, 1503 NULL, cmd->orig_fe_lun, l_isid, 1504 sa_res_key, all_tg_pt, aptpl); 1505 if (!local_pr_reg) { 1506 kfree(tidh_new); 1507 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1508 } 1509 1510 if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) { 1511 kfree(tidh_new); 1512 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1513 target_pr_kref_release); 1514 kmem_cache_free(t10_pr_reg_cache, local_pr_reg); 1515 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1516 } 1517 1518 tidh_new->dest_pr_reg = local_pr_reg; 1519 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1520 1521 if (cmd->data_length < 28) { 1522 pr_warn("SPC-PR: Received PR OUT parameter list" 1523 " length too small: %u\n", cmd->data_length); 1524 ret = TCM_INVALID_PARAMETER_LIST; 1525 goto out; 1526 } 1527 1528 buf = transport_kmap_data_sg(cmd); 1529 if (!buf) { 1530 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1531 goto out; 1532 } 1533 1534 /* 1535 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1536 * first extract TransportID Parameter Data Length, and make sure 1537 * the value matches up to the SCSI expected data transfer length. 1538 */ 1539 tpdl = get_unaligned_be32(&buf[24]); 1540 1541 if ((tpdl + 28) != cmd->data_length) { 1542 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1543 " does not equal CDB data_length: %u\n", tpdl, 1544 cmd->data_length); 1545 ret = TCM_INVALID_PARAMETER_LIST; 1546 goto out_unmap; 1547 } 1548 /* 1549 * Start processing the received transport IDs using the 1550 * receiving I_T Nexus portal's fabric dependent methods to 1551 * obtain the SCSI Initiator Port/Device Identifiers. 1552 */ 1553 ptr = &buf[28]; 1554 1555 while (tpdl > 0) { 1556 struct se_lun *dest_lun, *tmp_lun; 1557 1558 proto_ident = (ptr[0] & 0x0f); 1559 dest_tpg = NULL; 1560 1561 spin_lock(&dev->se_port_lock); 1562 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1563 tmp_tpg = tmp_lun->lun_tpg; 1564 1565 /* 1566 * Look for the matching proto_ident provided by 1567 * the received TransportID 1568 */ 1569 if (tmp_tpg->proto_id != proto_ident) 1570 continue; 1571 dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi; 1572 1573 iport_ptr = NULL; 1574 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1575 ptr, &tid_len, &iport_ptr); 1576 if (!i_str) 1577 continue; 1578 /* 1579 * Determine if this SCSI device server requires that 1580 * SCSI Intiatior TransportID w/ ISIDs is enforced 1581 * for fabric modules (iSCSI) requiring them. 1582 */ 1583 if (tpg->se_tpg_tfo->sess_get_initiator_sid && 1584 dev->dev_attrib.enforce_pr_isids && 1585 !iport_ptr) { 1586 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.", 1587 i_str); 1588 ret = TCM_INVALID_PARAMETER_LIST; 1589 spin_unlock(&dev->se_port_lock); 1590 goto out_unmap; 1591 } 1592 1593 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1594 spin_unlock(&dev->se_port_lock); 1595 1596 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1597 pr_err(" core_scsi3_tpg_depend_item()" 1598 " for tmp_tpg\n"); 1599 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1600 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1601 goto out_unmap; 1602 } 1603 /* 1604 * Locate the destination initiator ACL to be registered 1605 * from the decoded fabric module specific TransportID 1606 * at *i_str. 1607 */ 1608 mutex_lock(&tmp_tpg->acl_node_mutex); 1609 dest_node_acl = __core_tpg_get_initiator_node_acl( 1610 tmp_tpg, i_str); 1611 if (dest_node_acl) 1612 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1613 mutex_unlock(&tmp_tpg->acl_node_mutex); 1614 1615 if (!dest_node_acl) { 1616 core_scsi3_tpg_undepend_item(tmp_tpg); 1617 spin_lock(&dev->se_port_lock); 1618 continue; 1619 } 1620 1621 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1622 pr_err("configfs_depend_item() failed" 1623 " for dest_node_acl->acl_group\n"); 1624 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1625 core_scsi3_tpg_undepend_item(tmp_tpg); 1626 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1627 goto out_unmap; 1628 } 1629 1630 dest_tpg = tmp_tpg; 1631 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n", 1632 dest_tpg->se_tpg_tfo->fabric_name, 1633 dest_node_acl->initiatorname, dest_rtpi); 1634 1635 spin_lock(&dev->se_port_lock); 1636 break; 1637 } 1638 spin_unlock(&dev->se_port_lock); 1639 1640 if (!dest_tpg) { 1641 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1642 " dest_tpg\n"); 1643 ret = TCM_INVALID_PARAMETER_LIST; 1644 goto out_unmap; 1645 } 1646 1647 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1648 " tid_len: %d for %s + %s\n", 1649 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, 1650 tpdl, tid_len, i_str, iport_ptr); 1651 1652 if (tid_len > tpdl) { 1653 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1654 " %u for Transport ID: %s\n", tid_len, ptr); 1655 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1656 core_scsi3_tpg_undepend_item(dest_tpg); 1657 ret = TCM_INVALID_PARAMETER_LIST; 1658 goto out_unmap; 1659 } 1660 /* 1661 * Locate the desintation struct se_dev_entry pointer for matching 1662 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1663 * Target Port. 1664 */ 1665 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1666 dest_rtpi); 1667 if (!dest_se_deve) { 1668 pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n", 1669 dest_tpg->se_tpg_tfo->fabric_name, 1670 dest_rtpi); 1671 1672 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1673 core_scsi3_tpg_undepend_item(dest_tpg); 1674 ret = TCM_INVALID_PARAMETER_LIST; 1675 goto out_unmap; 1676 } 1677 1678 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1679 pr_err("core_scsi3_lunacl_depend_item()" 1680 " failed\n"); 1681 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1682 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1683 core_scsi3_tpg_undepend_item(dest_tpg); 1684 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1685 goto out_unmap; 1686 } 1687 1688 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1689 " dest_se_deve mapped_lun: %llu\n", 1690 dest_tpg->se_tpg_tfo->fabric_name, 1691 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1692 1693 /* 1694 * Skip any TransportIDs that already have a registration for 1695 * this target port. 1696 */ 1697 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1698 iport_ptr); 1699 if (pr_reg_e) { 1700 core_scsi3_put_pr_reg(pr_reg_e); 1701 core_scsi3_lunacl_undepend_item(dest_se_deve); 1702 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1703 core_scsi3_tpg_undepend_item(dest_tpg); 1704 ptr += tid_len; 1705 tpdl -= tid_len; 1706 tid_len = 0; 1707 continue; 1708 } 1709 /* 1710 * Allocate a struct pr_transport_id_holder and setup 1711 * the dest_node_acl and dest_se_deve pointers for the 1712 * loop below. 1713 */ 1714 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1715 GFP_KERNEL); 1716 if (!tidh_new) { 1717 pr_err("Unable to allocate tidh_new\n"); 1718 core_scsi3_lunacl_undepend_item(dest_se_deve); 1719 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1720 core_scsi3_tpg_undepend_item(dest_tpg); 1721 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1722 goto out_unmap; 1723 } 1724 INIT_LIST_HEAD(&tidh_new->dest_list); 1725 tidh_new->dest_tpg = dest_tpg; 1726 tidh_new->dest_node_acl = dest_node_acl; 1727 tidh_new->dest_se_deve = dest_se_deve; 1728 1729 /* 1730 * Allocate, but do NOT add the registration for the 1731 * TransportID referenced SCSI Initiator port. This 1732 * done because of the following from spc4r17 in section 1733 * 6.14.3 wrt SPEC_I_PT: 1734 * 1735 * "If a registration fails for any initiator port (e.g., if th 1736 * logical unit does not have enough resources available to 1737 * hold the registration information), no registrations shall be 1738 * made, and the command shall be terminated with 1739 * CHECK CONDITION status." 1740 * 1741 * That means we call __core_scsi3_alloc_registration() here, 1742 * and then call __core_scsi3_add_registration() in the 1743 * 2nd loop which will never fail. 1744 */ 1745 dest_lun = dest_se_deve->se_lun; 1746 1747 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1748 dest_node_acl, dest_lun, dest_se_deve, 1749 dest_se_deve->mapped_lun, iport_ptr, 1750 sa_res_key, all_tg_pt, aptpl); 1751 if (!dest_pr_reg) { 1752 core_scsi3_lunacl_undepend_item(dest_se_deve); 1753 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1754 core_scsi3_tpg_undepend_item(dest_tpg); 1755 kfree(tidh_new); 1756 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1757 goto out_unmap; 1758 } 1759 tidh_new->dest_pr_reg = dest_pr_reg; 1760 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1761 1762 ptr += tid_len; 1763 tpdl -= tid_len; 1764 tid_len = 0; 1765 1766 } 1767 1768 transport_kunmap_data_sg(cmd); 1769 1770 /* 1771 * Go ahead and create a registrations from tid_dest_list for the 1772 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1773 * and dest_se_deve. 1774 * 1775 * The SA Reservation Key from the PROUT is set for the 1776 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1777 * means that the TransportID Initiator port will be 1778 * registered on all of the target ports in the SCSI target device 1779 * ALL_TG_PT=0 means the registration will only be for the 1780 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1781 * was received. 1782 */ 1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1784 dest_tpg = tidh->dest_tpg; 1785 dest_node_acl = tidh->dest_node_acl; 1786 dest_se_deve = tidh->dest_se_deve; 1787 dest_pr_reg = tidh->dest_pr_reg; 1788 1789 list_del(&tidh->dest_list); 1790 kfree(tidh); 1791 1792 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1793 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1794 1795 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1796 dest_pr_reg, 0, 0); 1797 1798 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1799 " registered Transport ID for Node: %s%s Mapped LUN:" 1800 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, 1801 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1802 dest_se_deve->mapped_lun : 0); 1803 1804 if (dest_pr_reg == local_pr_reg) 1805 continue; 1806 1807 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1808 core_scsi3_tpg_undepend_item(dest_tpg); 1809 } 1810 1811 return 0; 1812 out_unmap: 1813 transport_kunmap_data_sg(cmd); 1814 out: 1815 /* 1816 * For the failure case, release everything from tid_dest_list 1817 * including *dest_pr_reg and the configfs dependances.. 1818 */ 1819 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1820 bool is_local = false; 1821 1822 dest_tpg = tidh->dest_tpg; 1823 dest_node_acl = tidh->dest_node_acl; 1824 dest_se_deve = tidh->dest_se_deve; 1825 dest_pr_reg = tidh->dest_pr_reg; 1826 1827 if (dest_pr_reg == local_pr_reg) 1828 is_local = true; 1829 1830 list_del(&tidh->dest_list); 1831 kfree(tidh); 1832 /* 1833 * Release any extra ALL_TG_PT=1 registrations for 1834 * the SPEC_I_PT=1 case. 1835 */ 1836 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1837 &dest_pr_reg->pr_reg_atp_list, 1838 pr_reg_atp_mem_list) { 1839 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1840 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1841 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1842 } 1843 1844 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1845 core_scsi3_lunacl_undepend_item(dest_se_deve); 1846 1847 if (is_local) 1848 continue; 1849 1850 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1851 core_scsi3_tpg_undepend_item(dest_tpg); 1852 } 1853 return ret; 1854 } 1855 1856 static int core_scsi3_update_aptpl_buf( 1857 struct se_device *dev, 1858 unsigned char *buf, 1859 u32 pr_aptpl_buf_len) 1860 { 1861 struct se_portal_group *tpg; 1862 struct t10_pr_registration *pr_reg; 1863 unsigned char tmp[512], isid_buf[32]; 1864 ssize_t len = 0; 1865 int reg_count = 0; 1866 int ret = 0; 1867 1868 spin_lock(&dev->dev_reservation_lock); 1869 spin_lock(&dev->t10_pr.registration_lock); 1870 /* 1871 * Walk the registration list.. 1872 */ 1873 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1874 pr_reg_list) { 1875 1876 tmp[0] = '\0'; 1877 isid_buf[0] = '\0'; 1878 tpg = pr_reg->pr_reg_nacl->se_tpg; 1879 /* 1880 * Write out any ISID value to APTPL metadata that was included 1881 * in the original registration. 1882 */ 1883 if (pr_reg->isid_present_at_reg) 1884 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1885 pr_reg->pr_reg_isid); 1886 /* 1887 * Include special metadata if the pr_reg matches the 1888 * reservation holder. 1889 */ 1890 if (dev->dev_pr_res_holder == pr_reg) { 1891 snprintf(tmp, 512, "PR_REG_START: %d" 1892 "\ninitiator_fabric=%s\n" 1893 "initiator_node=%s\n%s" 1894 "sa_res_key=%llu\n" 1895 "res_holder=1\nres_type=%02x\n" 1896 "res_scope=%02x\nres_all_tg_pt=%d\n" 1897 "mapped_lun=%llu\n", reg_count, 1898 tpg->se_tpg_tfo->fabric_name, 1899 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1900 pr_reg->pr_res_key, pr_reg->pr_res_type, 1901 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1902 pr_reg->pr_res_mapped_lun); 1903 } else { 1904 snprintf(tmp, 512, "PR_REG_START: %d\n" 1905 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1906 "sa_res_key=%llu\nres_holder=0\n" 1907 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1908 reg_count, tpg->se_tpg_tfo->fabric_name, 1909 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1910 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1911 pr_reg->pr_res_mapped_lun); 1912 } 1913 1914 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1915 pr_err("Unable to update renaming APTPL metadata," 1916 " reallocating larger buffer\n"); 1917 ret = -EMSGSIZE; 1918 goto out; 1919 } 1920 len += sprintf(buf+len, "%s", tmp); 1921 1922 /* 1923 * Include information about the associated SCSI target port. 1924 */ 1925 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1926 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1927 " %d\n", tpg->se_tpg_tfo->fabric_name, 1928 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1929 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1930 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1931 reg_count); 1932 1933 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1934 pr_err("Unable to update renaming APTPL metadata," 1935 " reallocating larger buffer\n"); 1936 ret = -EMSGSIZE; 1937 goto out; 1938 } 1939 len += sprintf(buf+len, "%s", tmp); 1940 reg_count++; 1941 } 1942 1943 if (!reg_count) 1944 len += sprintf(buf+len, "No Registrations or Reservations"); 1945 1946 out: 1947 spin_unlock(&dev->t10_pr.registration_lock); 1948 spin_unlock(&dev->dev_reservation_lock); 1949 1950 return ret; 1951 } 1952 1953 static int __core_scsi3_write_aptpl_to_file( 1954 struct se_device *dev, 1955 unsigned char *buf) 1956 { 1957 struct t10_wwn *wwn = &dev->t10_wwn; 1958 struct file *file; 1959 int flags = O_RDWR | O_CREAT | O_TRUNC; 1960 char *path; 1961 u32 pr_aptpl_buf_len; 1962 int ret; 1963 loff_t pos = 0; 1964 1965 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1966 &wwn->unit_serial[0]); 1967 if (!path) 1968 return -ENOMEM; 1969 1970 file = filp_open(path, flags, 0600); 1971 if (IS_ERR(file)) { 1972 pr_err("filp_open(%s) for APTPL metadata" 1973 " failed\n", path); 1974 kfree(path); 1975 return PTR_ERR(file); 1976 } 1977 1978 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1979 1980 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1981 1982 if (ret < 0) 1983 pr_debug("Error writing APTPL metadata file: %s\n", path); 1984 fput(file); 1985 kfree(path); 1986 1987 return (ret < 0) ? -EIO : 0; 1988 } 1989 1990 /* 1991 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1992 * write out the updated metadata to struct file for this SCSI device. 1993 */ 1994 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1995 { 1996 unsigned char *buf; 1997 int rc, len = PR_APTPL_BUF_LEN; 1998 1999 if (!aptpl) { 2000 char *null_buf = "No Registrations or Reservations\n"; 2001 2002 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2003 dev->t10_pr.pr_aptpl_active = 0; 2004 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2005 2006 if (rc) 2007 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2008 2009 return 0; 2010 } 2011 retry: 2012 buf = vzalloc(len); 2013 if (!buf) 2014 return TCM_OUT_OF_RESOURCES; 2015 2016 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2017 if (rc < 0) { 2018 vfree(buf); 2019 len *= 2; 2020 goto retry; 2021 } 2022 2023 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2024 if (rc != 0) { 2025 pr_err("SPC-3 PR: Could not update APTPL\n"); 2026 vfree(buf); 2027 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2028 } 2029 dev->t10_pr.pr_aptpl_active = 1; 2030 vfree(buf); 2031 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2032 return 0; 2033 } 2034 2035 static sense_reason_t 2036 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2037 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2038 { 2039 struct se_session *se_sess = cmd->se_sess; 2040 struct se_device *dev = cmd->se_dev; 2041 struct se_lun *se_lun = cmd->se_lun; 2042 struct se_portal_group *se_tpg; 2043 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2044 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2045 unsigned char isid_buf[PR_REG_ISID_LEN] = { }; 2046 unsigned char *isid_ptr = NULL; 2047 sense_reason_t ret = TCM_NO_SENSE; 2048 int pr_holder = 0, type; 2049 2050 if (!se_sess || !se_lun) { 2051 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2052 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2053 } 2054 se_tpg = se_sess->se_tpg; 2055 2056 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2057 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2058 PR_REG_ISID_LEN); 2059 isid_ptr = &isid_buf[0]; 2060 } 2061 /* 2062 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2063 */ 2064 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2065 if (!pr_reg) { 2066 if (res_key) { 2067 pr_warn("SPC-3 PR: Reservation Key non-zero" 2068 " for SA REGISTER, returning CONFLICT\n"); 2069 return TCM_RESERVATION_CONFLICT; 2070 } 2071 /* 2072 * Do nothing but return GOOD status. 2073 */ 2074 if (!sa_res_key) 2075 return 0; 2076 2077 if (!spec_i_pt) { 2078 /* 2079 * Perform the Service Action REGISTER on the Initiator 2080 * Port Endpoint that the PRO was received from on the 2081 * Logical Unit of the SCSI device server. 2082 */ 2083 if (core_scsi3_alloc_registration(cmd->se_dev, 2084 se_sess->se_node_acl, cmd->se_lun, 2085 NULL, cmd->orig_fe_lun, isid_ptr, 2086 sa_res_key, all_tg_pt, aptpl, 2087 register_type, 0)) { 2088 pr_err("Unable to allocate" 2089 " struct t10_pr_registration\n"); 2090 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2091 } 2092 } else { 2093 /* 2094 * Register both the Initiator port that received 2095 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2096 * TransportID from Parameter list and loop through 2097 * fabric dependent parameter list while calling 2098 * logic from of core_scsi3_alloc_registration() for 2099 * each TransportID provided SCSI Initiator Port/Device 2100 */ 2101 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2102 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2103 if (ret != 0) 2104 return ret; 2105 } 2106 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2107 } 2108 2109 /* ok, existing registration */ 2110 2111 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2112 pr_err("SPC-3 PR REGISTER: Received" 2113 " res_key: 0x%016Lx does not match" 2114 " existing SA REGISTER res_key:" 2115 " 0x%016Lx\n", res_key, 2116 pr_reg->pr_res_key); 2117 ret = TCM_RESERVATION_CONFLICT; 2118 goto out; 2119 } 2120 2121 if (spec_i_pt) { 2122 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2123 " set on a registered nexus\n"); 2124 ret = TCM_INVALID_PARAMETER_LIST; 2125 goto out; 2126 } 2127 2128 /* 2129 * An existing ALL_TG_PT=1 registration being released 2130 * must also set ALL_TG_PT=1 in the incoming PROUT. 2131 */ 2132 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2133 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2134 " registration exists, but ALL_TG_PT=1 bit not" 2135 " present in received PROUT\n"); 2136 ret = TCM_INVALID_CDB_FIELD; 2137 goto out; 2138 } 2139 2140 /* 2141 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2142 */ 2143 if (sa_res_key) { 2144 /* 2145 * Increment PRgeneration counter for struct se_device" 2146 * upon a successful REGISTER, see spc4r17 section 6.3.2 2147 * READ_KEYS service action. 2148 */ 2149 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2150 pr_reg->pr_res_key = sa_res_key; 2151 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2152 " Key for %s to: 0x%016Lx PRgeneration:" 2153 " 0x%08x\n", cmd->se_tfo->fabric_name, 2154 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2155 pr_reg->pr_reg_nacl->initiatorname, 2156 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2157 2158 } else { 2159 /* 2160 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2161 */ 2162 type = pr_reg->pr_res_type; 2163 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2164 pr_reg); 2165 if (pr_holder < 0) { 2166 ret = TCM_RESERVATION_CONFLICT; 2167 goto out; 2168 } 2169 2170 spin_lock(&pr_tmpl->registration_lock); 2171 /* 2172 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2173 * and matching pr_res_key. 2174 */ 2175 if (pr_reg->pr_reg_all_tg_pt) { 2176 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2177 &pr_tmpl->registration_list, 2178 pr_reg_list) { 2179 2180 if (!pr_reg_p->pr_reg_all_tg_pt) 2181 continue; 2182 if (pr_reg_p->pr_res_key != res_key) 2183 continue; 2184 if (pr_reg == pr_reg_p) 2185 continue; 2186 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2187 pr_reg_p->pr_reg_nacl->initiatorname)) 2188 continue; 2189 2190 __core_scsi3_free_registration(dev, 2191 pr_reg_p, NULL, 0); 2192 } 2193 } 2194 2195 /* 2196 * Release the calling I_T Nexus registration now.. 2197 */ 2198 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2199 pr_reg = NULL; 2200 2201 /* 2202 * From spc4r17, section 5.7.11.3 Unregistering 2203 * 2204 * If the persistent reservation is a registrants only 2205 * type, the device server shall establish a unit 2206 * attention condition for the initiator port associated 2207 * with every registered I_T nexus except for the I_T 2208 * nexus on which the PERSISTENT RESERVE OUT command was 2209 * received, with the additional sense code set to 2210 * RESERVATIONS RELEASED. 2211 */ 2212 if (pr_holder && 2213 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2214 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2215 list_for_each_entry(pr_reg_p, 2216 &pr_tmpl->registration_list, 2217 pr_reg_list) { 2218 2219 target_ua_allocate_lun( 2220 pr_reg_p->pr_reg_nacl, 2221 pr_reg_p->pr_res_mapped_lun, 2222 0x2A, 2223 ASCQ_2AH_RESERVATIONS_RELEASED); 2224 } 2225 } 2226 2227 spin_unlock(&pr_tmpl->registration_lock); 2228 } 2229 2230 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2231 2232 out: 2233 if (pr_reg) 2234 core_scsi3_put_pr_reg(pr_reg); 2235 return ret; 2236 } 2237 2238 unsigned char *core_scsi3_pr_dump_type(int type) 2239 { 2240 switch (type) { 2241 case PR_TYPE_WRITE_EXCLUSIVE: 2242 return "Write Exclusive Access"; 2243 case PR_TYPE_EXCLUSIVE_ACCESS: 2244 return "Exclusive Access"; 2245 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2246 return "Write Exclusive Access, Registrants Only"; 2247 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2248 return "Exclusive Access, Registrants Only"; 2249 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2250 return "Write Exclusive Access, All Registrants"; 2251 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2252 return "Exclusive Access, All Registrants"; 2253 default: 2254 break; 2255 } 2256 2257 return "Unknown SPC-3 PR Type"; 2258 } 2259 2260 static sense_reason_t 2261 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2262 { 2263 struct se_device *dev = cmd->se_dev; 2264 struct se_session *se_sess = cmd->se_sess; 2265 struct se_lun *se_lun = cmd->se_lun; 2266 struct t10_pr_registration *pr_reg, *pr_res_holder; 2267 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2268 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2269 sense_reason_t ret; 2270 2271 if (!se_sess || !se_lun) { 2272 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2273 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2274 } 2275 /* 2276 * Locate the existing *pr_reg via struct se_node_acl pointers 2277 */ 2278 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2279 se_sess); 2280 if (!pr_reg) { 2281 pr_err("SPC-3 PR: Unable to locate" 2282 " PR_REGISTERED *pr_reg for RESERVE\n"); 2283 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2284 } 2285 /* 2286 * From spc4r17 Section 5.7.9: Reserving: 2287 * 2288 * An application client creates a persistent reservation by issuing 2289 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2290 * a registered I_T nexus with the following parameters: 2291 * a) RESERVATION KEY set to the value of the reservation key that is 2292 * registered with the logical unit for the I_T nexus; and 2293 */ 2294 if (res_key != pr_reg->pr_res_key) { 2295 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2296 " does not match existing SA REGISTER res_key:" 2297 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2298 ret = TCM_RESERVATION_CONFLICT; 2299 goto out_put_pr_reg; 2300 } 2301 /* 2302 * From spc4r17 Section 5.7.9: Reserving: 2303 * 2304 * From above: 2305 * b) TYPE field and SCOPE field set to the persistent reservation 2306 * being created. 2307 * 2308 * Only one persistent reservation is allowed at a time per logical unit 2309 * and that persistent reservation has a scope of LU_SCOPE. 2310 */ 2311 if (scope != PR_SCOPE_LU_SCOPE) { 2312 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2313 ret = TCM_INVALID_PARAMETER_LIST; 2314 goto out_put_pr_reg; 2315 } 2316 /* 2317 * See if we have an existing PR reservation holder pointer at 2318 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2319 * *pr_res_holder. 2320 */ 2321 spin_lock(&dev->dev_reservation_lock); 2322 pr_res_holder = dev->dev_pr_res_holder; 2323 if (pr_res_holder) { 2324 /* 2325 * From spc4r17 Section 5.7.9: Reserving: 2326 * 2327 * If the device server receives a PERSISTENT RESERVE OUT 2328 * command from an I_T nexus other than a persistent reservation 2329 * holder (see 5.7.10) that attempts to create a persistent 2330 * reservation when a persistent reservation already exists for 2331 * the logical unit, then the command shall be completed with 2332 * RESERVATION CONFLICT status. 2333 */ 2334 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2335 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2336 pr_err("SPC-3 PR: Attempted RESERVE from" 2337 " [%s]: %s while reservation already held by" 2338 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2339 cmd->se_tfo->fabric_name, 2340 se_sess->se_node_acl->initiatorname, 2341 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2342 pr_res_holder->pr_reg_nacl->initiatorname); 2343 2344 spin_unlock(&dev->dev_reservation_lock); 2345 ret = TCM_RESERVATION_CONFLICT; 2346 goto out_put_pr_reg; 2347 } 2348 /* 2349 * From spc4r17 Section 5.7.9: Reserving: 2350 * 2351 * If a persistent reservation holder attempts to modify the 2352 * type or scope of an existing persistent reservation, the 2353 * command shall be completed with RESERVATION CONFLICT status. 2354 */ 2355 if ((pr_res_holder->pr_res_type != type) || 2356 (pr_res_holder->pr_res_scope != scope)) { 2357 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2358 pr_err("SPC-3 PR: Attempted RESERVE from" 2359 " [%s]: %s trying to change TYPE and/or SCOPE," 2360 " while reservation already held by [%s]: %s," 2361 " returning RESERVATION_CONFLICT\n", 2362 cmd->se_tfo->fabric_name, 2363 se_sess->se_node_acl->initiatorname, 2364 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2365 pr_res_holder->pr_reg_nacl->initiatorname); 2366 2367 spin_unlock(&dev->dev_reservation_lock); 2368 ret = TCM_RESERVATION_CONFLICT; 2369 goto out_put_pr_reg; 2370 } 2371 /* 2372 * From spc4r17 Section 5.7.9: Reserving: 2373 * 2374 * If the device server receives a PERSISTENT RESERVE OUT 2375 * command with RESERVE service action where the TYPE field and 2376 * the SCOPE field contain the same values as the existing type 2377 * and scope from a persistent reservation holder, it shall not 2378 * make any change to the existing persistent reservation and 2379 * shall completethe command with GOOD status. 2380 */ 2381 spin_unlock(&dev->dev_reservation_lock); 2382 ret = 0; 2383 goto out_put_pr_reg; 2384 } 2385 /* 2386 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2387 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2388 */ 2389 pr_reg->pr_res_scope = scope; 2390 pr_reg->pr_res_type = type; 2391 pr_reg->pr_res_holder = 1; 2392 dev->dev_pr_res_holder = pr_reg; 2393 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2394 2395 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2396 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2397 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), 2398 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2399 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2400 cmd->se_tfo->fabric_name, 2401 se_sess->se_node_acl->initiatorname, 2402 i_buf); 2403 spin_unlock(&dev->dev_reservation_lock); 2404 2405 if (pr_tmpl->pr_aptpl_active) 2406 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2407 2408 ret = 0; 2409 out_put_pr_reg: 2410 core_scsi3_put_pr_reg(pr_reg); 2411 return ret; 2412 } 2413 2414 static sense_reason_t 2415 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2416 u64 res_key) 2417 { 2418 switch (type) { 2419 case PR_TYPE_WRITE_EXCLUSIVE: 2420 case PR_TYPE_EXCLUSIVE_ACCESS: 2421 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2422 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2423 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2424 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2425 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2426 default: 2427 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2428 " 0x%02x\n", type); 2429 return TCM_INVALID_CDB_FIELD; 2430 } 2431 } 2432 2433 static void __core_scsi3_complete_pro_release( 2434 struct se_device *dev, 2435 struct se_node_acl *se_nacl, 2436 struct t10_pr_registration *pr_reg, 2437 int explicit, 2438 int unreg) 2439 { 2440 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2441 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2442 int pr_res_type = 0, pr_res_scope = 0; 2443 2444 lockdep_assert_held(&dev->dev_reservation_lock); 2445 2446 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2447 /* 2448 * Go ahead and release the current PR reservation holder. 2449 * If an All Registrants reservation is currently active and 2450 * a unregister operation is requested, replace the current 2451 * dev_pr_res_holder with another active registration. 2452 */ 2453 if (dev->dev_pr_res_holder) { 2454 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2455 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2456 dev->dev_pr_res_holder->pr_res_type = 0; 2457 dev->dev_pr_res_holder->pr_res_scope = 0; 2458 dev->dev_pr_res_holder->pr_res_holder = 0; 2459 dev->dev_pr_res_holder = NULL; 2460 } 2461 if (!unreg) 2462 goto out; 2463 2464 spin_lock(&dev->t10_pr.registration_lock); 2465 list_del_init(&pr_reg->pr_reg_list); 2466 /* 2467 * If the I_T nexus is a reservation holder, the persistent reservation 2468 * is of an all registrants type, and the I_T nexus is the last remaining 2469 * registered I_T nexus, then the device server shall also release the 2470 * persistent reservation. 2471 */ 2472 if (!list_empty(&dev->t10_pr.registration_list) && 2473 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2474 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2475 dev->dev_pr_res_holder = 2476 list_entry(dev->t10_pr.registration_list.next, 2477 struct t10_pr_registration, pr_reg_list); 2478 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2479 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2480 dev->dev_pr_res_holder->pr_res_holder = 1; 2481 } 2482 spin_unlock(&dev->t10_pr.registration_lock); 2483 out: 2484 if (!dev->dev_pr_res_holder) { 2485 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2486 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2487 tfo->fabric_name, (explicit) ? "explicit" : 2488 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2489 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2490 } 2491 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2492 tfo->fabric_name, se_nacl->initiatorname, 2493 i_buf); 2494 /* 2495 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2496 */ 2497 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2498 } 2499 2500 static sense_reason_t 2501 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2502 u64 res_key) 2503 { 2504 struct se_device *dev = cmd->se_dev; 2505 struct se_session *se_sess = cmd->se_sess; 2506 struct se_lun *se_lun = cmd->se_lun; 2507 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2508 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2509 sense_reason_t ret = 0; 2510 2511 if (!se_sess || !se_lun) { 2512 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2514 } 2515 /* 2516 * Locate the existing *pr_reg via struct se_node_acl pointers 2517 */ 2518 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2519 if (!pr_reg) { 2520 pr_err("SPC-3 PR: Unable to locate" 2521 " PR_REGISTERED *pr_reg for RELEASE\n"); 2522 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2523 } 2524 /* 2525 * From spc4r17 Section 5.7.11.2 Releasing: 2526 * 2527 * If there is no persistent reservation or in response to a persistent 2528 * reservation release request from a registered I_T nexus that is not a 2529 * persistent reservation holder (see 5.7.10), the device server shall 2530 * do the following: 2531 * 2532 * a) Not release the persistent reservation, if any; 2533 * b) Not remove any registrations; and 2534 * c) Complete the command with GOOD status. 2535 */ 2536 spin_lock(&dev->dev_reservation_lock); 2537 pr_res_holder = dev->dev_pr_res_holder; 2538 if (!pr_res_holder) { 2539 /* 2540 * No persistent reservation, return GOOD status. 2541 */ 2542 spin_unlock(&dev->dev_reservation_lock); 2543 goto out_put_pr_reg; 2544 } 2545 2546 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2547 /* 2548 * Release request from a registered I_T nexus that is not a 2549 * persistent reservation holder. return GOOD status. 2550 */ 2551 spin_unlock(&dev->dev_reservation_lock); 2552 goto out_put_pr_reg; 2553 } 2554 2555 /* 2556 * From spc4r17 Section 5.7.11.2 Releasing: 2557 * 2558 * Only the persistent reservation holder (see 5.7.10) is allowed to 2559 * release a persistent reservation. 2560 * 2561 * An application client releases the persistent reservation by issuing 2562 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2563 * an I_T nexus that is a persistent reservation holder with the 2564 * following parameters: 2565 * 2566 * a) RESERVATION KEY field set to the value of the reservation key 2567 * that is registered with the logical unit for the I_T nexus; 2568 */ 2569 if (res_key != pr_reg->pr_res_key) { 2570 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2571 " does not match existing SA REGISTER res_key:" 2572 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2573 spin_unlock(&dev->dev_reservation_lock); 2574 ret = TCM_RESERVATION_CONFLICT; 2575 goto out_put_pr_reg; 2576 } 2577 /* 2578 * From spc4r17 Section 5.7.11.2 Releasing and above: 2579 * 2580 * b) TYPE field and SCOPE field set to match the persistent 2581 * reservation being released. 2582 */ 2583 if ((pr_res_holder->pr_res_type != type) || 2584 (pr_res_holder->pr_res_scope != scope)) { 2585 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2586 pr_err("SPC-3 PR RELEASE: Attempted to release" 2587 " reservation from [%s]: %s with different TYPE " 2588 "and/or SCOPE while reservation already held by" 2589 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2590 cmd->se_tfo->fabric_name, 2591 se_sess->se_node_acl->initiatorname, 2592 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2593 pr_res_holder->pr_reg_nacl->initiatorname); 2594 2595 spin_unlock(&dev->dev_reservation_lock); 2596 ret = TCM_RESERVATION_CONFLICT; 2597 goto out_put_pr_reg; 2598 } 2599 /* 2600 * In response to a persistent reservation release request from the 2601 * persistent reservation holder the device server shall perform a 2602 * release by doing the following as an uninterrupted series of actions: 2603 * a) Release the persistent reservation; 2604 * b) Not remove any registration(s); 2605 * c) If the released persistent reservation is a registrants only type 2606 * or all registrants type persistent reservation, 2607 * the device server shall establish a unit attention condition for 2608 * the initiator port associated with every regis- 2609 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2610 * RESERVE OUT command with RELEASE service action was received, 2611 * with the additional sense code set to RESERVATIONS RELEASED; and 2612 * d) If the persistent reservation is of any other type, the device 2613 * server shall not establish a unit attention condition. 2614 */ 2615 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2616 pr_reg, 1, 0); 2617 2618 spin_unlock(&dev->dev_reservation_lock); 2619 2620 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2621 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2622 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2623 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2624 /* 2625 * If no UNIT ATTENTION conditions will be established for 2626 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2627 * go ahead and check for APTPL=1 update+write below 2628 */ 2629 goto write_aptpl; 2630 } 2631 2632 spin_lock(&pr_tmpl->registration_lock); 2633 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2634 pr_reg_list) { 2635 /* 2636 * Do not establish a UNIT ATTENTION condition 2637 * for the calling I_T Nexus 2638 */ 2639 if (pr_reg_p == pr_reg) 2640 continue; 2641 2642 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2643 pr_reg_p->pr_res_mapped_lun, 2644 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2645 } 2646 spin_unlock(&pr_tmpl->registration_lock); 2647 2648 write_aptpl: 2649 if (pr_tmpl->pr_aptpl_active) 2650 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2651 2652 out_put_pr_reg: 2653 core_scsi3_put_pr_reg(pr_reg); 2654 return ret; 2655 } 2656 2657 static sense_reason_t 2658 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2659 { 2660 struct se_device *dev = cmd->se_dev; 2661 struct se_node_acl *pr_reg_nacl; 2662 struct se_session *se_sess = cmd->se_sess; 2663 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2664 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2665 u64 pr_res_mapped_lun = 0; 2666 int calling_it_nexus = 0; 2667 /* 2668 * Locate the existing *pr_reg via struct se_node_acl pointers 2669 */ 2670 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2671 se_sess->se_node_acl, se_sess); 2672 if (!pr_reg_n) { 2673 pr_err("SPC-3 PR: Unable to locate" 2674 " PR_REGISTERED *pr_reg for CLEAR\n"); 2675 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2676 } 2677 /* 2678 * From spc4r17 section 5.7.11.6, Clearing: 2679 * 2680 * Any application client may release the persistent reservation and 2681 * remove all registrations from a device server by issuing a 2682 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2683 * registered I_T nexus with the following parameter: 2684 * 2685 * a) RESERVATION KEY field set to the value of the reservation key 2686 * that is registered with the logical unit for the I_T nexus. 2687 */ 2688 if (res_key != pr_reg_n->pr_res_key) { 2689 pr_err("SPC-3 PR REGISTER: Received" 2690 " res_key: 0x%016Lx does not match" 2691 " existing SA REGISTER res_key:" 2692 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2693 core_scsi3_put_pr_reg(pr_reg_n); 2694 return TCM_RESERVATION_CONFLICT; 2695 } 2696 /* 2697 * a) Release the persistent reservation, if any; 2698 */ 2699 spin_lock(&dev->dev_reservation_lock); 2700 pr_res_holder = dev->dev_pr_res_holder; 2701 if (pr_res_holder) { 2702 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2703 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2704 pr_res_holder, 0, 0); 2705 } 2706 spin_unlock(&dev->dev_reservation_lock); 2707 /* 2708 * b) Remove all registration(s) (see spc4r17 5.7.7); 2709 */ 2710 spin_lock(&pr_tmpl->registration_lock); 2711 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2712 &pr_tmpl->registration_list, pr_reg_list) { 2713 2714 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2715 pr_reg_nacl = pr_reg->pr_reg_nacl; 2716 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2717 __core_scsi3_free_registration(dev, pr_reg, NULL, 2718 calling_it_nexus); 2719 /* 2720 * e) Establish a unit attention condition for the initiator 2721 * port associated with every registered I_T nexus other 2722 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2723 * command with CLEAR service action was received, with the 2724 * additional sense code set to RESERVATIONS PREEMPTED. 2725 */ 2726 if (!calling_it_nexus) 2727 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2728 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2729 } 2730 spin_unlock(&pr_tmpl->registration_lock); 2731 2732 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2733 cmd->se_tfo->fabric_name); 2734 2735 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2736 2737 core_scsi3_pr_generation(dev); 2738 return 0; 2739 } 2740 2741 static void __core_scsi3_complete_pro_preempt( 2742 struct se_device *dev, 2743 struct t10_pr_registration *pr_reg, 2744 struct list_head *preempt_and_abort_list, 2745 int type, 2746 int scope, 2747 enum preempt_type preempt_type) 2748 { 2749 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2750 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2751 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2752 2753 lockdep_assert_held(&dev->dev_reservation_lock); 2754 2755 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2756 /* 2757 * Do an implicit RELEASE of the existing reservation. 2758 */ 2759 if (dev->dev_pr_res_holder) 2760 __core_scsi3_complete_pro_release(dev, nacl, 2761 dev->dev_pr_res_holder, 0, 0); 2762 2763 dev->dev_pr_res_holder = pr_reg; 2764 pr_reg->pr_res_holder = 1; 2765 pr_reg->pr_res_type = type; 2766 pr_reg->pr_res_scope = scope; 2767 2768 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2769 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2770 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2771 core_scsi3_pr_dump_type(type), 2772 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2773 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2774 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2775 nacl->initiatorname, i_buf); 2776 /* 2777 * For PREEMPT_AND_ABORT, add the preempting reservation's 2778 * struct t10_pr_registration to the list that will be compared 2779 * against received CDBs.. 2780 */ 2781 if (preempt_and_abort_list) 2782 list_add_tail(&pr_reg->pr_reg_abort_list, 2783 preempt_and_abort_list); 2784 } 2785 2786 static void core_scsi3_release_preempt_and_abort( 2787 struct list_head *preempt_and_abort_list, 2788 struct t10_pr_registration *pr_reg_holder) 2789 { 2790 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2791 2792 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2793 pr_reg_abort_list) { 2794 2795 list_del(&pr_reg->pr_reg_abort_list); 2796 if (pr_reg_holder == pr_reg) 2797 continue; 2798 if (pr_reg->pr_res_holder) { 2799 pr_warn("pr_reg->pr_res_holder still set\n"); 2800 continue; 2801 } 2802 2803 pr_reg->pr_reg_deve = NULL; 2804 pr_reg->pr_reg_nacl = NULL; 2805 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2806 } 2807 } 2808 2809 static sense_reason_t 2810 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2811 u64 sa_res_key, enum preempt_type preempt_type) 2812 { 2813 struct se_device *dev = cmd->se_dev; 2814 struct se_node_acl *pr_reg_nacl; 2815 struct se_session *se_sess = cmd->se_sess; 2816 LIST_HEAD(preempt_and_abort_list); 2817 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2818 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2819 u64 pr_res_mapped_lun = 0; 2820 int all_reg = 0, calling_it_nexus = 0; 2821 bool sa_res_key_unmatched = sa_res_key != 0; 2822 int prh_type = 0, prh_scope = 0; 2823 2824 if (!se_sess) 2825 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2826 2827 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2828 se_sess); 2829 if (!pr_reg_n) { 2830 pr_err("SPC-3 PR: Unable to locate" 2831 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2832 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2833 return TCM_RESERVATION_CONFLICT; 2834 } 2835 if (pr_reg_n->pr_res_key != res_key) { 2836 core_scsi3_put_pr_reg(pr_reg_n); 2837 return TCM_RESERVATION_CONFLICT; 2838 } 2839 if (scope != PR_SCOPE_LU_SCOPE) { 2840 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2841 core_scsi3_put_pr_reg(pr_reg_n); 2842 return TCM_INVALID_PARAMETER_LIST; 2843 } 2844 2845 spin_lock(&dev->dev_reservation_lock); 2846 pr_res_holder = dev->dev_pr_res_holder; 2847 if (pr_res_holder && 2848 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2849 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2850 all_reg = 1; 2851 2852 if (!all_reg && !sa_res_key) { 2853 spin_unlock(&dev->dev_reservation_lock); 2854 core_scsi3_put_pr_reg(pr_reg_n); 2855 return TCM_INVALID_PARAMETER_LIST; 2856 } 2857 /* 2858 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2859 * 2860 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2861 * persistent reservation holder or there is no persistent reservation 2862 * holder (i.e., there is no persistent reservation), then the device 2863 * server shall perform a preempt by doing the following in an 2864 * uninterrupted series of actions. (See below..) 2865 */ 2866 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2867 /* 2868 * No existing or SA Reservation Key matching reservations.. 2869 * 2870 * PROUT SA PREEMPT with All Registrant type reservations are 2871 * allowed to be processed without a matching SA Reservation Key 2872 */ 2873 spin_lock(&pr_tmpl->registration_lock); 2874 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2875 &pr_tmpl->registration_list, pr_reg_list) { 2876 /* 2877 * Removing of registrations in non all registrants 2878 * type reservations without a matching SA reservation 2879 * key. 2880 * 2881 * a) Remove the registrations for all I_T nexuses 2882 * specified by the SERVICE ACTION RESERVATION KEY 2883 * field; 2884 * b) Ignore the contents of the SCOPE and TYPE fields; 2885 * c) Process tasks as defined in 5.7.1; and 2886 * d) Establish a unit attention condition for the 2887 * initiator port associated with every I_T nexus 2888 * that lost its registration other than the I_T 2889 * nexus on which the PERSISTENT RESERVE OUT command 2890 * was received, with the additional sense code set 2891 * to REGISTRATIONS PREEMPTED. 2892 */ 2893 if (!all_reg) { 2894 if (pr_reg->pr_res_key != sa_res_key) 2895 continue; 2896 sa_res_key_unmatched = false; 2897 2898 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2899 pr_reg_nacl = pr_reg->pr_reg_nacl; 2900 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2901 __core_scsi3_free_registration(dev, pr_reg, 2902 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2903 NULL, calling_it_nexus); 2904 } else { 2905 /* 2906 * Case for any existing all registrants type 2907 * reservation, follow logic in spc4r17 section 2908 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2909 * 2910 * For a ZERO SA Reservation key, release 2911 * all other registrations and do an implicit 2912 * release of active persistent reservation. 2913 * 2914 * For a non-ZERO SA Reservation key, only 2915 * release the matching reservation key from 2916 * registrations. 2917 */ 2918 if ((sa_res_key) && 2919 (pr_reg->pr_res_key != sa_res_key)) 2920 continue; 2921 sa_res_key_unmatched = false; 2922 2923 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2924 if (calling_it_nexus) 2925 continue; 2926 2927 pr_reg_nacl = pr_reg->pr_reg_nacl; 2928 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2929 __core_scsi3_free_registration(dev, pr_reg, 2930 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2931 NULL, 0); 2932 } 2933 if (!calling_it_nexus) 2934 target_ua_allocate_lun(pr_reg_nacl, 2935 pr_res_mapped_lun, 0x2A, 2936 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2937 } 2938 spin_unlock(&pr_tmpl->registration_lock); 2939 /* 2940 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2941 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2942 * RESERVATION KEY field to a value that does not match any 2943 * registered reservation key, then the device server shall 2944 * complete the command with RESERVATION CONFLICT status. 2945 */ 2946 if (sa_res_key_unmatched) { 2947 spin_unlock(&dev->dev_reservation_lock); 2948 core_scsi3_put_pr_reg(pr_reg_n); 2949 return TCM_RESERVATION_CONFLICT; 2950 } 2951 /* 2952 * For an existing all registrants type reservation 2953 * with a zero SA rservation key, preempt the existing 2954 * reservation with the new PR type and scope. 2955 */ 2956 if (pr_res_holder && all_reg && !(sa_res_key)) { 2957 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2958 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2959 type, scope, preempt_type); 2960 } 2961 2962 spin_unlock(&dev->dev_reservation_lock); 2963 2964 /* 2965 * SPC-4 5.12.11.2.6 Preempting and aborting 2966 * The actions described in this subclause shall be performed 2967 * for all I_T nexuses that are registered with the non-zero 2968 * SERVICE ACTION RESERVATION KEY value, without regard for 2969 * whether the preempted I_T nexuses hold the persistent 2970 * reservation. If the SERVICE ACTION RESERVATION KEY field is 2971 * set to zero and an all registrants persistent reservation is 2972 * present, the device server shall abort all commands for all 2973 * registered I_T nexuses. 2974 */ 2975 if (preempt_type == PREEMPT_AND_ABORT) { 2976 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, 2977 cmd); 2978 core_scsi3_release_preempt_and_abort( 2979 &preempt_and_abort_list, pr_reg_n); 2980 } 2981 2982 if (pr_tmpl->pr_aptpl_active) 2983 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2984 2985 core_scsi3_put_pr_reg(pr_reg_n); 2986 core_scsi3_pr_generation(cmd->se_dev); 2987 return 0; 2988 } 2989 /* 2990 * The PREEMPTing SA reservation key matches that of the 2991 * existing persistent reservation, first, we check if 2992 * we are preempting our own reservation. 2993 * From spc4r17, section 5.7.11.4.3 Preempting 2994 * persistent reservations and registration handling 2995 * 2996 * If an all registrants persistent reservation is not 2997 * present, it is not an error for the persistent 2998 * reservation holder to preempt itself (i.e., a 2999 * PERSISTENT RESERVE OUT with a PREEMPT service action 3000 * or a PREEMPT AND ABORT service action with the 3001 * SERVICE ACTION RESERVATION KEY value equal to the 3002 * persistent reservation holder's reservation key that 3003 * is received from the persistent reservation holder). 3004 * In that case, the device server shall establish the 3005 * new persistent reservation and maintain the 3006 * registration. 3007 */ 3008 prh_type = pr_res_holder->pr_res_type; 3009 prh_scope = pr_res_holder->pr_res_scope; 3010 /* 3011 * If the SERVICE ACTION RESERVATION KEY field identifies a 3012 * persistent reservation holder (see 5.7.10), the device 3013 * server shall perform a preempt by doing the following as 3014 * an uninterrupted series of actions: 3015 * 3016 * a) Release the persistent reservation for the holder 3017 * identified by the SERVICE ACTION RESERVATION KEY field; 3018 */ 3019 if (pr_reg_n != pr_res_holder) 3020 __core_scsi3_complete_pro_release(dev, 3021 pr_res_holder->pr_reg_nacl, 3022 dev->dev_pr_res_holder, 0, 0); 3023 /* 3024 * b) Remove the registrations for all I_T nexuses identified 3025 * by the SERVICE ACTION RESERVATION KEY field, except the 3026 * I_T nexus that is being used for the PERSISTENT RESERVE 3027 * OUT command. If an all registrants persistent reservation 3028 * is present and the SERVICE ACTION RESERVATION KEY field 3029 * is set to zero, then all registrations shall be removed 3030 * except for that of the I_T nexus that is being used for 3031 * the PERSISTENT RESERVE OUT command; 3032 */ 3033 spin_lock(&pr_tmpl->registration_lock); 3034 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3035 &pr_tmpl->registration_list, pr_reg_list) { 3036 3037 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3038 if (calling_it_nexus) 3039 continue; 3040 3041 if (sa_res_key && pr_reg->pr_res_key != sa_res_key) 3042 continue; 3043 3044 pr_reg_nacl = pr_reg->pr_reg_nacl; 3045 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3046 __core_scsi3_free_registration(dev, pr_reg, 3047 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3048 calling_it_nexus); 3049 /* 3050 * e) Establish a unit attention condition for the initiator 3051 * port associated with every I_T nexus that lost its 3052 * persistent reservation and/or registration, with the 3053 * additional sense code set to REGISTRATIONS PREEMPTED; 3054 */ 3055 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3056 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3057 } 3058 spin_unlock(&pr_tmpl->registration_lock); 3059 /* 3060 * c) Establish a persistent reservation for the preempting 3061 * I_T nexus using the contents of the SCOPE and TYPE fields; 3062 */ 3063 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3064 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3065 type, scope, preempt_type); 3066 /* 3067 * d) Process tasks as defined in 5.7.1; 3068 * e) See above.. 3069 * f) If the type or scope has changed, then for every I_T nexus 3070 * whose reservation key was not removed, except for the I_T 3071 * nexus on which the PERSISTENT RESERVE OUT command was 3072 * received, the device server shall establish a unit 3073 * attention condition for the initiator port associated with 3074 * that I_T nexus, with the additional sense code set to 3075 * RESERVATIONS RELEASED. If the type or scope have not 3076 * changed, then no unit attention condition(s) shall be 3077 * established for this reason. 3078 */ 3079 if ((prh_type != type) || (prh_scope != scope)) { 3080 spin_lock(&pr_tmpl->registration_lock); 3081 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3082 &pr_tmpl->registration_list, pr_reg_list) { 3083 3084 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3085 if (calling_it_nexus) 3086 continue; 3087 3088 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3089 pr_reg->pr_res_mapped_lun, 0x2A, 3090 ASCQ_2AH_RESERVATIONS_RELEASED); 3091 } 3092 spin_unlock(&pr_tmpl->registration_lock); 3093 } 3094 spin_unlock(&dev->dev_reservation_lock); 3095 /* 3096 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3097 * All received CDBs for the matching existing reservation and 3098 * registrations undergo ABORT_TASK logic. 3099 * 3100 * From there, core_scsi3_release_preempt_and_abort() will 3101 * release every registration in the list (which have already 3102 * been removed from the primary pr_reg list), except the 3103 * new persistent reservation holder, the calling Initiator Port. 3104 */ 3105 if (preempt_type == PREEMPT_AND_ABORT) { 3106 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3107 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3108 pr_reg_n); 3109 } 3110 3111 if (pr_tmpl->pr_aptpl_active) 3112 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3113 3114 core_scsi3_put_pr_reg(pr_reg_n); 3115 core_scsi3_pr_generation(cmd->se_dev); 3116 return 0; 3117 } 3118 3119 static sense_reason_t 3120 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3121 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3122 { 3123 switch (type) { 3124 case PR_TYPE_WRITE_EXCLUSIVE: 3125 case PR_TYPE_EXCLUSIVE_ACCESS: 3126 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3127 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3128 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3129 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3130 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3131 sa_res_key, preempt_type); 3132 default: 3133 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3134 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3135 return TCM_INVALID_CDB_FIELD; 3136 } 3137 } 3138 3139 3140 static sense_reason_t 3141 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3142 u64 sa_res_key, int aptpl, int unreg) 3143 { 3144 struct se_session *se_sess = cmd->se_sess; 3145 struct se_device *dev = cmd->se_dev; 3146 struct se_dev_entry *dest_se_deve = NULL; 3147 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3148 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3149 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3150 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3151 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3152 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3153 unsigned char *buf; 3154 const unsigned char *initiator_str; 3155 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { }; 3156 u32 tid_len, tmp_tid_len; 3157 int new_reg = 0, type, scope, matching_iname; 3158 sense_reason_t ret; 3159 unsigned short rtpi; 3160 unsigned char proto_ident; 3161 3162 if (!se_sess || !se_lun) { 3163 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3164 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3165 } 3166 3167 se_tpg = se_sess->se_tpg; 3168 tf_ops = se_tpg->se_tpg_tfo; 3169 /* 3170 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3171 * Register behaviors for a REGISTER AND MOVE service action 3172 * 3173 * Locate the existing *pr_reg via struct se_node_acl pointers 3174 */ 3175 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3176 se_sess); 3177 if (!pr_reg) { 3178 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3179 " *pr_reg for REGISTER_AND_MOVE\n"); 3180 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3181 } 3182 /* 3183 * The provided reservation key much match the existing reservation key 3184 * provided during this initiator's I_T nexus registration. 3185 */ 3186 if (res_key != pr_reg->pr_res_key) { 3187 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3188 " res_key: 0x%016Lx does not match existing SA REGISTER" 3189 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3190 ret = TCM_RESERVATION_CONFLICT; 3191 goto out_put_pr_reg; 3192 } 3193 /* 3194 * The service active reservation key needs to be non zero 3195 */ 3196 if (!sa_res_key) { 3197 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3198 " sa_res_key\n"); 3199 ret = TCM_INVALID_PARAMETER_LIST; 3200 goto out_put_pr_reg; 3201 } 3202 3203 /* 3204 * Determine the Relative Target Port Identifier where the reservation 3205 * will be moved to for the TransportID containing SCSI initiator WWN 3206 * information. 3207 */ 3208 buf = transport_kmap_data_sg(cmd); 3209 if (!buf) { 3210 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3211 goto out_put_pr_reg; 3212 } 3213 3214 rtpi = get_unaligned_be16(&buf[18]); 3215 tid_len = get_unaligned_be32(&buf[20]); 3216 transport_kunmap_data_sg(cmd); 3217 buf = NULL; 3218 3219 if ((tid_len + 24) != cmd->data_length) { 3220 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3221 " does not equal CDB data_length: %u\n", tid_len, 3222 cmd->data_length); 3223 ret = TCM_INVALID_PARAMETER_LIST; 3224 goto out_put_pr_reg; 3225 } 3226 3227 spin_lock(&dev->se_port_lock); 3228 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3229 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi) 3230 continue; 3231 dest_se_tpg = tmp_lun->lun_tpg; 3232 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3233 if (!dest_tf_ops) 3234 continue; 3235 3236 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3237 spin_unlock(&dev->se_port_lock); 3238 3239 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3240 pr_err("core_scsi3_tpg_depend_item() failed" 3241 " for dest_se_tpg\n"); 3242 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3243 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3244 goto out_put_pr_reg; 3245 } 3246 3247 spin_lock(&dev->se_port_lock); 3248 break; 3249 } 3250 spin_unlock(&dev->se_port_lock); 3251 3252 if (!dest_se_tpg || !dest_tf_ops) { 3253 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3254 " fabric ops from Relative Target Port Identifier:" 3255 " %hu\n", rtpi); 3256 ret = TCM_INVALID_PARAMETER_LIST; 3257 goto out_put_pr_reg; 3258 } 3259 3260 buf = transport_kmap_data_sg(cmd); 3261 if (!buf) { 3262 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3263 goto out_put_pr_reg; 3264 } 3265 proto_ident = (buf[24] & 0x0f); 3266 3267 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3268 " 0x%02x\n", proto_ident); 3269 3270 if (proto_ident != dest_se_tpg->proto_id) { 3271 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3272 " proto_ident: 0x%02x does not match ident: 0x%02x" 3273 " from fabric: %s\n", proto_ident, 3274 dest_se_tpg->proto_id, 3275 dest_tf_ops->fabric_name); 3276 ret = TCM_INVALID_PARAMETER_LIST; 3277 goto out; 3278 } 3279 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3280 &buf[24], &tmp_tid_len, &iport_ptr); 3281 if (!initiator_str) { 3282 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3283 " initiator_str from Transport ID\n"); 3284 ret = TCM_INVALID_PARAMETER_LIST; 3285 goto out; 3286 } 3287 3288 transport_kunmap_data_sg(cmd); 3289 buf = NULL; 3290 3291 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3292 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? 3293 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3294 iport_ptr : ""); 3295 /* 3296 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3297 * action specifies a TransportID that is the same as the initiator port 3298 * of the I_T nexus for the command received, then the command shall 3299 * be terminated with CHECK CONDITION status, with the sense key set to 3300 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3301 * IN PARAMETER LIST. 3302 */ 3303 pr_reg_nacl = pr_reg->pr_reg_nacl; 3304 matching_iname = (!strcmp(initiator_str, 3305 pr_reg_nacl->initiatorname)) ? 1 : 0; 3306 if (!matching_iname) 3307 goto after_iport_check; 3308 3309 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3310 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3311 " matches: %s on received I_T Nexus\n", initiator_str, 3312 pr_reg_nacl->initiatorname); 3313 ret = TCM_INVALID_PARAMETER_LIST; 3314 goto out; 3315 } 3316 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3317 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3318 " matches: %s %s on received I_T Nexus\n", 3319 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3320 pr_reg->pr_reg_isid); 3321 ret = TCM_INVALID_PARAMETER_LIST; 3322 goto out; 3323 } 3324 after_iport_check: 3325 /* 3326 * Locate the destination struct se_node_acl from the received Transport ID 3327 */ 3328 mutex_lock(&dest_se_tpg->acl_node_mutex); 3329 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3330 initiator_str); 3331 if (dest_node_acl) 3332 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3333 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3334 3335 if (!dest_node_acl) { 3336 pr_err("Unable to locate %s dest_node_acl for" 3337 " TransportID%s\n", dest_tf_ops->fabric_name, 3338 initiator_str); 3339 ret = TCM_INVALID_PARAMETER_LIST; 3340 goto out; 3341 } 3342 3343 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3344 pr_err("core_scsi3_nodeacl_depend_item() for" 3345 " dest_node_acl\n"); 3346 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3347 dest_node_acl = NULL; 3348 ret = TCM_INVALID_PARAMETER_LIST; 3349 goto out; 3350 } 3351 3352 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3353 " %s from TransportID\n", dest_tf_ops->fabric_name, 3354 dest_node_acl->initiatorname); 3355 3356 /* 3357 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3358 * PORT IDENTIFIER. 3359 */ 3360 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3361 if (!dest_se_deve) { 3362 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3363 " %hu\n", dest_tf_ops->fabric_name, rtpi); 3364 ret = TCM_INVALID_PARAMETER_LIST; 3365 goto out; 3366 } 3367 3368 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3369 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3370 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3371 dest_se_deve = NULL; 3372 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3373 goto out; 3374 } 3375 3376 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3377 " ACL for dest_se_deve->mapped_lun: %llu\n", 3378 dest_tf_ops->fabric_name, dest_node_acl->initiatorname, 3379 dest_se_deve->mapped_lun); 3380 3381 /* 3382 * A persistent reservation needs to already existing in order to 3383 * successfully complete the REGISTER_AND_MOVE service action.. 3384 */ 3385 spin_lock(&dev->dev_reservation_lock); 3386 pr_res_holder = dev->dev_pr_res_holder; 3387 if (!pr_res_holder) { 3388 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3389 " currently held\n"); 3390 spin_unlock(&dev->dev_reservation_lock); 3391 ret = TCM_INVALID_CDB_FIELD; 3392 goto out; 3393 } 3394 /* 3395 * The received on I_T Nexus must be the reservation holder. 3396 * 3397 * From spc4r17 section 5.7.8 Table 50 -- 3398 * Register behaviors for a REGISTER AND MOVE service action 3399 */ 3400 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3402 " Nexus is not reservation holder\n"); 3403 spin_unlock(&dev->dev_reservation_lock); 3404 ret = TCM_RESERVATION_CONFLICT; 3405 goto out; 3406 } 3407 /* 3408 * From spc4r17 section 5.7.8: registering and moving reservation 3409 * 3410 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3411 * action is received and the established persistent reservation is a 3412 * Write Exclusive - All Registrants type or Exclusive Access - 3413 * All Registrants type reservation, then the command shall be completed 3414 * with RESERVATION CONFLICT status. 3415 */ 3416 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3417 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3418 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3419 " reservation for type: %s\n", 3420 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3421 spin_unlock(&dev->dev_reservation_lock); 3422 ret = TCM_RESERVATION_CONFLICT; 3423 goto out; 3424 } 3425 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3426 /* 3427 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3428 */ 3429 type = pr_res_holder->pr_res_type; 3430 scope = pr_res_holder->pr_res_type; 3431 /* 3432 * c) Associate the reservation key specified in the SERVICE ACTION 3433 * RESERVATION KEY field with the I_T nexus specified as the 3434 * destination of the register and move, where: 3435 * A) The I_T nexus is specified by the TransportID and the 3436 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3437 * B) Regardless of the TransportID format used, the association for 3438 * the initiator port is based on either the initiator port name 3439 * (see 3.1.71) on SCSI transport protocols where port names are 3440 * required or the initiator port identifier (see 3.1.70) on SCSI 3441 * transport protocols where port names are not required; 3442 * d) Register the reservation key specified in the SERVICE ACTION 3443 * RESERVATION KEY field; 3444 * 3445 * Also, It is not an error for a REGISTER AND MOVE service action to 3446 * register an I_T nexus that is already registered with the same 3447 * reservation key or a different reservation key. 3448 */ 3449 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3450 iport_ptr); 3451 if (!dest_pr_reg) { 3452 struct se_lun *dest_lun = dest_se_deve->se_lun; 3453 3454 spin_unlock(&dev->dev_reservation_lock); 3455 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3456 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3457 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3458 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3459 goto out; 3460 } 3461 spin_lock(&dev->dev_reservation_lock); 3462 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3463 iport_ptr); 3464 new_reg = 1; 3465 } else { 3466 /* 3467 * e) Retain the reservation key specified in the SERVICE ACTION 3468 * RESERVATION KEY field and associated information; 3469 */ 3470 dest_pr_reg->pr_res_key = sa_res_key; 3471 } 3472 /* 3473 * f) Release the persistent reservation for the persistent reservation 3474 * holder (i.e., the I_T nexus on which the 3475 */ 3476 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3477 dev->dev_pr_res_holder, 0, 0); 3478 /* 3479 * g) Move the persistent reservation to the specified I_T nexus using 3480 * the same scope and type as the persistent reservation released in 3481 * item f); and 3482 */ 3483 dev->dev_pr_res_holder = dest_pr_reg; 3484 dest_pr_reg->pr_res_holder = 1; 3485 dest_pr_reg->pr_res_type = type; 3486 pr_reg->pr_res_scope = scope; 3487 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3488 /* 3489 * Increment PRGeneration for existing registrations.. 3490 */ 3491 if (!new_reg) 3492 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3493 spin_unlock(&dev->dev_reservation_lock); 3494 3495 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3496 " created new reservation holder TYPE: %s on object RTPI:" 3497 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, 3498 core_scsi3_pr_dump_type(type), rtpi, 3499 dest_pr_reg->pr_res_generation); 3500 pr_debug("SPC-3 PR Successfully moved reservation from" 3501 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3502 tf_ops->fabric_name, pr_reg_nacl->initiatorname, 3503 i_buf, dest_tf_ops->fabric_name, 3504 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3505 iport_ptr : ""); 3506 /* 3507 * It is now safe to release configfs group dependencies for destination 3508 * of Transport ID Initiator Device/Port Identifier 3509 */ 3510 core_scsi3_lunacl_undepend_item(dest_se_deve); 3511 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3512 core_scsi3_tpg_undepend_item(dest_se_tpg); 3513 /* 3514 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3515 * nexus on which PERSISTENT RESERVE OUT command was received. 3516 */ 3517 if (unreg) { 3518 spin_lock(&pr_tmpl->registration_lock); 3519 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3520 spin_unlock(&pr_tmpl->registration_lock); 3521 } else 3522 core_scsi3_put_pr_reg(pr_reg); 3523 3524 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3525 3526 core_scsi3_put_pr_reg(dest_pr_reg); 3527 return 0; 3528 out: 3529 if (buf) 3530 transport_kunmap_data_sg(cmd); 3531 if (dest_se_deve) 3532 core_scsi3_lunacl_undepend_item(dest_se_deve); 3533 if (dest_node_acl) 3534 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3535 core_scsi3_tpg_undepend_item(dest_se_tpg); 3536 3537 out_put_pr_reg: 3538 core_scsi3_put_pr_reg(pr_reg); 3539 return ret; 3540 } 3541 3542 static sense_reason_t 3543 target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key, 3544 u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt) 3545 { 3546 struct exec_cmd_ops *ops = cmd->protocol_data; 3547 3548 if (!cmd->se_sess || !cmd->se_lun) { 3549 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3550 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3551 } 3552 3553 if (!ops->execute_pr_out) { 3554 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 3555 return TCM_UNSUPPORTED_SCSI_OPCODE; 3556 } 3557 3558 switch (sa) { 3559 case PRO_REGISTER_AND_MOVE: 3560 case PRO_REPLACE_LOST_RESERVATION: 3561 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n"); 3562 return TCM_UNSUPPORTED_SCSI_OPCODE; 3563 } 3564 3565 if (spec_i_pt || all_tg_pt) { 3566 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n"); 3567 return TCM_UNSUPPORTED_SCSI_OPCODE; 3568 } 3569 3570 return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl); 3571 } 3572 3573 /* 3574 * See spc4r17 section 6.14 Table 170 3575 */ 3576 sense_reason_t 3577 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3578 { 3579 struct se_device *dev = cmd->se_dev; 3580 unsigned char *cdb = &cmd->t_task_cdb[0]; 3581 unsigned char *buf; 3582 u64 res_key, sa_res_key; 3583 int sa, scope, type, aptpl; 3584 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3585 sense_reason_t ret; 3586 3587 /* 3588 * Following spc2r20 5.5.1 Reservations overview: 3589 * 3590 * If a logical unit has been reserved by any RESERVE command and is 3591 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3592 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3593 * initiator or service action and shall terminate with a RESERVATION 3594 * CONFLICT status. 3595 */ 3596 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3597 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3598 " SPC-2 reservation is held, returning" 3599 " RESERVATION_CONFLICT\n"); 3600 return TCM_RESERVATION_CONFLICT; 3601 } 3602 3603 /* 3604 * FIXME: A NULL struct se_session pointer means an this is not coming from 3605 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3606 */ 3607 if (!cmd->se_sess) 3608 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3609 3610 if (cmd->data_length < 24) { 3611 pr_warn("SPC-PR: Received PR OUT parameter list" 3612 " length too small: %u\n", cmd->data_length); 3613 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3614 } 3615 3616 /* 3617 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3618 */ 3619 sa = (cdb[1] & 0x1f); 3620 scope = (cdb[2] & 0xf0); 3621 type = (cdb[2] & 0x0f); 3622 3623 buf = transport_kmap_data_sg(cmd); 3624 if (!buf) 3625 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3626 3627 /* 3628 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3629 */ 3630 res_key = get_unaligned_be64(&buf[0]); 3631 sa_res_key = get_unaligned_be64(&buf[8]); 3632 /* 3633 * REGISTER_AND_MOVE uses a different SA parameter list containing 3634 * SCSI TransportIDs. 3635 */ 3636 if (sa != PRO_REGISTER_AND_MOVE) { 3637 spec_i_pt = (buf[20] & 0x08); 3638 all_tg_pt = (buf[20] & 0x04); 3639 aptpl = (buf[20] & 0x01); 3640 } else { 3641 aptpl = (buf[17] & 0x01); 3642 unreg = (buf[17] & 0x02); 3643 } 3644 /* 3645 * If the backend device has been configured to force APTPL metadata 3646 * write-out, go ahead and propigate aptpl=1 down now. 3647 */ 3648 if (dev->dev_attrib.force_pr_aptpl) 3649 aptpl = 1; 3650 3651 transport_kunmap_data_sg(cmd); 3652 buf = NULL; 3653 3654 /* 3655 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3656 */ 3657 if (spec_i_pt && (sa != PRO_REGISTER)) 3658 return TCM_INVALID_PARAMETER_LIST; 3659 3660 /* 3661 * From spc4r17 section 6.14: 3662 * 3663 * If the SPEC_I_PT bit is set to zero, the service action is not 3664 * REGISTER AND MOVE, and the parameter list length is not 24, then 3665 * the command shall be terminated with CHECK CONDITION status, with 3666 * the sense key set to ILLEGAL REQUEST, and the additional sense 3667 * code set to PARAMETER LIST LENGTH ERROR. 3668 */ 3669 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3670 (cmd->data_length != 24)) { 3671 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3672 " list length: %u\n", cmd->data_length); 3673 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3674 } 3675 3676 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 3677 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type, 3678 aptpl, all_tg_pt, spec_i_pt); 3679 goto done; 3680 } 3681 3682 /* 3683 * (core_scsi3_emulate_pro_* function parameters 3684 * are defined by spc4r17 Table 174: 3685 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3686 */ 3687 switch (sa) { 3688 case PRO_REGISTER: 3689 ret = core_scsi3_emulate_pro_register(cmd, 3690 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3691 break; 3692 case PRO_RESERVE: 3693 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3694 break; 3695 case PRO_RELEASE: 3696 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3697 break; 3698 case PRO_CLEAR: 3699 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3700 break; 3701 case PRO_PREEMPT: 3702 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3703 res_key, sa_res_key, PREEMPT); 3704 break; 3705 case PRO_PREEMPT_AND_ABORT: 3706 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3707 res_key, sa_res_key, PREEMPT_AND_ABORT); 3708 break; 3709 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3710 ret = core_scsi3_emulate_pro_register(cmd, 3711 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3712 break; 3713 case PRO_REGISTER_AND_MOVE: 3714 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3715 sa_res_key, aptpl, unreg); 3716 break; 3717 default: 3718 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3719 " action: 0x%02x\n", sa); 3720 return TCM_INVALID_CDB_FIELD; 3721 } 3722 3723 done: 3724 if (!ret) 3725 target_complete_cmd(cmd, SAM_STAT_GOOD); 3726 return ret; 3727 } 3728 3729 /* 3730 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3731 * 3732 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3733 */ 3734 static sense_reason_t 3735 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3736 { 3737 struct se_device *dev = cmd->se_dev; 3738 struct t10_pr_registration *pr_reg; 3739 unsigned char *buf; 3740 u32 add_len = 0, off = 8; 3741 3742 if (cmd->data_length < 8) { 3743 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3744 " too small\n", cmd->data_length); 3745 return TCM_INVALID_CDB_FIELD; 3746 } 3747 3748 buf = transport_kmap_data_sg(cmd); 3749 if (!buf) 3750 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3751 3752 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3753 3754 spin_lock(&dev->t10_pr.registration_lock); 3755 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3756 pr_reg_list) { 3757 /* 3758 * Check for overflow of 8byte PRI READ_KEYS payload and 3759 * next reservation key list descriptor. 3760 */ 3761 if (off + 8 <= cmd->data_length) { 3762 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3763 off += 8; 3764 } 3765 /* 3766 * SPC5r17: 6.16.2 READ KEYS service action 3767 * The ADDITIONAL LENGTH field indicates the number of bytes in 3768 * the Reservation key list. The contents of the ADDITIONAL 3769 * LENGTH field are not altered based on the allocation length 3770 */ 3771 add_len += 8; 3772 } 3773 spin_unlock(&dev->t10_pr.registration_lock); 3774 3775 put_unaligned_be32(add_len, &buf[4]); 3776 target_set_cmd_data_length(cmd, 8 + add_len); 3777 3778 transport_kunmap_data_sg(cmd); 3779 3780 return 0; 3781 } 3782 3783 /* 3784 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3785 * 3786 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3787 */ 3788 static sense_reason_t 3789 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3790 { 3791 struct se_device *dev = cmd->se_dev; 3792 struct t10_pr_registration *pr_reg; 3793 unsigned char *buf; 3794 u64 pr_res_key; 3795 u32 add_len = 0; 3796 3797 if (cmd->data_length < 8) { 3798 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3799 " too small\n", cmd->data_length); 3800 return TCM_INVALID_CDB_FIELD; 3801 } 3802 3803 buf = transport_kmap_data_sg(cmd); 3804 if (!buf) 3805 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3806 3807 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3808 3809 spin_lock(&dev->dev_reservation_lock); 3810 pr_reg = dev->dev_pr_res_holder; 3811 if (pr_reg) { 3812 /* 3813 * Set the Additional Length to 16 when a reservation is held 3814 */ 3815 add_len = 16; 3816 put_unaligned_be32(add_len, &buf[4]); 3817 3818 if (cmd->data_length < 22) 3819 goto err; 3820 3821 /* 3822 * Set the Reservation key. 3823 * 3824 * From spc4r17, section 5.7.10: 3825 * A persistent reservation holder has its reservation key 3826 * returned in the parameter data from a PERSISTENT 3827 * RESERVE IN command with READ RESERVATION service action as 3828 * follows: 3829 * a) For a persistent reservation of the type Write Exclusive 3830 * - All Registrants or Exclusive Access All Regitrants, 3831 * the reservation key shall be set to zero; or 3832 * b) For all other persistent reservation types, the 3833 * reservation key shall be set to the registered 3834 * reservation key for the I_T nexus that holds the 3835 * persistent reservation. 3836 */ 3837 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3838 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3839 pr_res_key = 0; 3840 else 3841 pr_res_key = pr_reg->pr_res_key; 3842 3843 put_unaligned_be64(pr_res_key, &buf[8]); 3844 /* 3845 * Set the SCOPE and TYPE 3846 */ 3847 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3848 (pr_reg->pr_res_type & 0x0f); 3849 } 3850 3851 target_set_cmd_data_length(cmd, 8 + add_len); 3852 3853 err: 3854 spin_unlock(&dev->dev_reservation_lock); 3855 transport_kunmap_data_sg(cmd); 3856 3857 return 0; 3858 } 3859 3860 /* 3861 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3862 * 3863 * See spc4r17 section 6.13.4 Table 165 3864 */ 3865 static sense_reason_t 3866 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3867 { 3868 struct se_device *dev = cmd->se_dev; 3869 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3870 unsigned char *buf; 3871 u16 len = 8; /* Hardcoded to 8. */ 3872 3873 if (cmd->data_length < 6) { 3874 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3875 " %u too small\n", cmd->data_length); 3876 return TCM_INVALID_CDB_FIELD; 3877 } 3878 3879 buf = transport_kmap_data_sg(cmd); 3880 if (!buf) 3881 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3882 3883 put_unaligned_be16(len, &buf[0]); 3884 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3885 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3886 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3887 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3888 /* 3889 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3890 * set the TMV: Task Mask Valid bit. 3891 */ 3892 buf[3] |= 0x80; 3893 /* 3894 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3895 */ 3896 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3897 /* 3898 * PTPL_A: Persistence across Target Power Loss Active bit 3899 */ 3900 if (pr_tmpl->pr_aptpl_active) 3901 buf[3] |= 0x01; 3902 /* 3903 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3904 */ 3905 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3906 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3907 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3908 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3909 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3910 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3911 3912 target_set_cmd_data_length(cmd, len); 3913 3914 transport_kunmap_data_sg(cmd); 3915 3916 return 0; 3917 } 3918 3919 /* 3920 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3921 * 3922 * See spc4r17 section 6.13.5 Table 168 and 169 3923 */ 3924 static sense_reason_t 3925 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3926 { 3927 struct se_device *dev = cmd->se_dev; 3928 struct se_node_acl *se_nacl; 3929 struct se_portal_group *se_tpg; 3930 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3931 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3932 unsigned char *buf; 3933 u32 add_desc_len = 0, add_len = 0; 3934 u32 off = 8; /* off into first Full Status descriptor */ 3935 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3936 int exp_desc_len, desc_len; 3937 bool all_reg = false; 3938 3939 if (cmd->data_length < 8) { 3940 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3941 " too small\n", cmd->data_length); 3942 return TCM_INVALID_CDB_FIELD; 3943 } 3944 3945 buf = transport_kmap_data_sg(cmd); 3946 if (!buf) 3947 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3948 3949 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3950 3951 spin_lock(&dev->dev_reservation_lock); 3952 if (dev->dev_pr_res_holder) { 3953 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3954 3955 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3956 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3957 all_reg = true; 3958 pr_res_type = pr_holder->pr_res_type; 3959 pr_res_scope = pr_holder->pr_res_scope; 3960 } 3961 } 3962 spin_unlock(&dev->dev_reservation_lock); 3963 3964 spin_lock(&pr_tmpl->registration_lock); 3965 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3966 &pr_tmpl->registration_list, pr_reg_list) { 3967 3968 se_nacl = pr_reg->pr_reg_nacl; 3969 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3970 add_desc_len = 0; 3971 3972 atomic_inc_mb(&pr_reg->pr_res_holders); 3973 spin_unlock(&pr_tmpl->registration_lock); 3974 /* 3975 * Determine expected length of $FABRIC_MOD specific 3976 * TransportID full status descriptor.. 3977 */ 3978 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3979 &format_code); 3980 if (exp_desc_len < 0 || 3981 exp_desc_len + add_len > cmd->data_length) { 3982 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3983 " out of buffer: %d\n", cmd->data_length); 3984 spin_lock(&pr_tmpl->registration_lock); 3985 atomic_dec_mb(&pr_reg->pr_res_holders); 3986 break; 3987 } 3988 /* 3989 * Set RESERVATION KEY 3990 */ 3991 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3992 off += 8; 3993 off += 4; /* Skip Over Reserved area */ 3994 3995 /* 3996 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3997 */ 3998 if (pr_reg->pr_reg_all_tg_pt) 3999 buf[off] = 0x02; 4000 /* 4001 * The struct se_lun pointer will be present for the 4002 * reservation holder for PR_HOLDER bit. 4003 * 4004 * Also, if this registration is the reservation 4005 * holder or there is an All Registrants reservation 4006 * active, fill in SCOPE and TYPE in the next byte. 4007 */ 4008 if (pr_reg->pr_res_holder) { 4009 buf[off++] |= 0x01; 4010 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4011 (pr_reg->pr_res_type & 0x0f); 4012 } else if (all_reg) { 4013 buf[off++] |= 0x01; 4014 buf[off++] = (pr_res_scope & 0xf0) | 4015 (pr_res_type & 0x0f); 4016 } else { 4017 off += 2; 4018 } 4019 4020 off += 4; /* Skip over reserved area */ 4021 /* 4022 * From spc4r17 6.3.15: 4023 * 4024 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4025 * IDENTIFIER field contains the relative port identifier (see 4026 * 3.1.120) of the target port that is part of the I_T nexus 4027 * described by this full status descriptor. If the ALL_TG_PT 4028 * bit is set to one, the contents of the RELATIVE TARGET PORT 4029 * IDENTIFIER field are not defined by this standard. 4030 */ 4031 if (!pr_reg->pr_reg_all_tg_pt) { 4032 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4033 4034 put_unaligned_be16(sep_rtpi, &buf[off]); 4035 off += 2; 4036 } else 4037 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4038 4039 buf[off+4] = se_tpg->proto_id; 4040 4041 /* 4042 * Now, have the $FABRIC_MOD fill in the transport ID. 4043 */ 4044 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4045 &format_code, &buf[off+4]); 4046 4047 spin_lock(&pr_tmpl->registration_lock); 4048 atomic_dec_mb(&pr_reg->pr_res_holders); 4049 4050 if (desc_len < 0) 4051 break; 4052 /* 4053 * Set the ADDITIONAL DESCRIPTOR LENGTH 4054 */ 4055 put_unaligned_be32(desc_len, &buf[off]); 4056 off += 4; 4057 /* 4058 * Size of full desctipor header minus TransportID 4059 * containing $FABRIC_MOD specific) initiator device/port 4060 * WWN information. 4061 * 4062 * See spc4r17 Section 6.13.5 Table 169 4063 */ 4064 add_desc_len = (24 + desc_len); 4065 4066 off += desc_len; 4067 add_len += add_desc_len; 4068 } 4069 spin_unlock(&pr_tmpl->registration_lock); 4070 /* 4071 * Set ADDITIONAL_LENGTH 4072 */ 4073 put_unaligned_be32(add_len, &buf[4]); 4074 target_set_cmd_data_length(cmd, 8 + add_len); 4075 4076 transport_kunmap_data_sg(cmd); 4077 4078 return 0; 4079 } 4080 4081 static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa) 4082 { 4083 struct exec_cmd_ops *ops = cmd->protocol_data; 4084 unsigned char *buf; 4085 sense_reason_t ret; 4086 4087 if (cmd->data_length < 8) { 4088 pr_err("PRIN SA SCSI Data Length: %u too small\n", 4089 cmd->data_length); 4090 return TCM_INVALID_CDB_FIELD; 4091 } 4092 4093 if (!ops->execute_pr_in) { 4094 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 4095 return TCM_UNSUPPORTED_SCSI_OPCODE; 4096 } 4097 4098 if (sa == PRI_READ_FULL_STATUS) { 4099 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n"); 4100 return TCM_UNSUPPORTED_SCSI_OPCODE; 4101 } 4102 4103 buf = transport_kmap_data_sg(cmd); 4104 if (!buf) 4105 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4106 4107 ret = ops->execute_pr_in(cmd, sa, buf); 4108 4109 transport_kunmap_data_sg(cmd); 4110 return ret; 4111 } 4112 4113 sense_reason_t 4114 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4115 { 4116 u8 sa = cmd->t_task_cdb[1] & 0x1f; 4117 sense_reason_t ret; 4118 4119 /* 4120 * Following spc2r20 5.5.1 Reservations overview: 4121 * 4122 * If a logical unit has been reserved by any RESERVE command and is 4123 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4124 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4125 * initiator or service action and shall terminate with a RESERVATION 4126 * CONFLICT status. 4127 */ 4128 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4129 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4130 " SPC-2 reservation is held, returning" 4131 " RESERVATION_CONFLICT\n"); 4132 return TCM_RESERVATION_CONFLICT; 4133 } 4134 4135 if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 4136 ret = target_try_pr_in_pt(cmd, sa); 4137 goto done; 4138 } 4139 4140 switch (sa) { 4141 case PRI_READ_KEYS: 4142 ret = core_scsi3_pri_read_keys(cmd); 4143 break; 4144 case PRI_READ_RESERVATION: 4145 ret = core_scsi3_pri_read_reservation(cmd); 4146 break; 4147 case PRI_REPORT_CAPABILITIES: 4148 ret = core_scsi3_pri_report_capabilities(cmd); 4149 break; 4150 case PRI_READ_FULL_STATUS: 4151 ret = core_scsi3_pri_read_full_status(cmd); 4152 break; 4153 default: 4154 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4155 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4156 return TCM_INVALID_CDB_FIELD; 4157 } 4158 4159 done: 4160 if (!ret) 4161 target_complete_cmd(cmd, SAM_STAT_GOOD); 4162 return ret; 4163 } 4164 4165 sense_reason_t 4166 target_check_reservation(struct se_cmd *cmd) 4167 { 4168 struct se_device *dev = cmd->se_dev; 4169 sense_reason_t ret; 4170 4171 if (!cmd->se_sess) 4172 return 0; 4173 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4174 return 0; 4175 if (!dev->dev_attrib.emulate_pr) 4176 return 0; 4177 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4178 return 0; 4179 4180 spin_lock(&dev->dev_reservation_lock); 4181 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4182 ret = target_scsi2_reservation_check(cmd); 4183 else 4184 ret = target_scsi3_pr_reservation_check(cmd); 4185 spin_unlock(&dev->dev_reservation_lock); 4186 4187 return ret; 4188 } 4189