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 <linux/fs_struct.h> 22 #include <scsi/scsi_proto.h> 23 #include <linux/unaligned.h> 24 25 #include <target/target_core_base.h> 26 #include <target/target_core_backend.h> 27 #include <target/target_core_fabric.h> 28 29 #include "target_core_internal.h" 30 #include "target_core_pr.h" 31 #include "target_core_ua.h" 32 33 /* 34 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 35 */ 36 struct pr_transport_id_holder { 37 struct t10_pr_registration *dest_pr_reg; 38 struct se_portal_group *dest_tpg; 39 struct se_node_acl *dest_node_acl; 40 struct se_dev_entry *dest_se_deve; 41 struct list_head dest_list; 42 }; 43 44 void core_pr_dump_initiator_port( 45 struct t10_pr_registration *pr_reg, 46 char *buf, 47 u32 size) 48 { 49 if (!pr_reg->isid_present_at_reg) { 50 buf[0] = '\0'; 51 return; 52 } 53 54 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 55 } 56 57 enum register_type { 58 REGISTER, 59 REGISTER_AND_IGNORE_EXISTING_KEY, 60 REGISTER_AND_MOVE, 61 }; 62 63 enum preempt_type { 64 PREEMPT, 65 PREEMPT_AND_ABORT, 66 }; 67 68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 69 struct t10_pr_registration *, int, int); 70 71 static int is_reservation_holder( 72 struct t10_pr_registration *pr_res_holder, 73 struct t10_pr_registration *pr_reg) 74 { 75 int pr_res_type; 76 77 if (pr_res_holder) { 78 pr_res_type = pr_res_holder->pr_res_type; 79 80 return pr_res_holder == pr_reg || 81 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 82 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 83 } 84 return 0; 85 } 86 87 static sense_reason_t 88 target_scsi2_reservation_check(struct se_cmd *cmd) 89 { 90 struct se_device *dev = cmd->se_dev; 91 struct se_session *sess = cmd->se_sess; 92 93 switch (cmd->t_task_cdb[0]) { 94 case INQUIRY: 95 case RELEASE_6: 96 case RELEASE_10: 97 return 0; 98 default: 99 break; 100 } 101 102 if (!dev->reservation_holder || !sess) 103 return 0; 104 105 if (dev->reservation_holder->se_node_acl != sess->se_node_acl) 106 return TCM_RESERVATION_CONFLICT; 107 108 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 109 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 110 return TCM_RESERVATION_CONFLICT; 111 } 112 113 return 0; 114 } 115 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 117 struct se_node_acl *, struct se_session *); 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 119 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 121 { 122 struct se_session *se_sess = cmd->se_sess; 123 struct se_device *dev = cmd->se_dev; 124 struct t10_pr_registration *pr_reg; 125 struct t10_reservation *pr_tmpl = &dev->t10_pr; 126 int conflict = 0; 127 128 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 129 se_sess); 130 if (pr_reg) { 131 /* 132 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 133 * behavior 134 * 135 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 136 * status, but no reservation shall be established and the 137 * persistent reservation shall not be changed, if the command 138 * is received from a) and b) below. 139 * 140 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 141 * status, but the persistent reservation shall not be released, 142 * if the command is received from a) and b) 143 * 144 * a) An I_T nexus that is a persistent reservation holder; or 145 * b) An I_T nexus that is registered if a registrants only or 146 * all registrants type persistent reservation is present. 147 * 148 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 149 * RELEASE(6) command, or RELEASE(10) command shall be processed 150 * as defined in SPC-2. 151 */ 152 if (pr_reg->pr_res_holder) { 153 core_scsi3_put_pr_reg(pr_reg); 154 return 1; 155 } 156 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 157 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 158 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 159 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 160 core_scsi3_put_pr_reg(pr_reg); 161 return 1; 162 } 163 core_scsi3_put_pr_reg(pr_reg); 164 conflict = 1; 165 } else { 166 /* 167 * Following spc2r20 5.5.1 Reservations overview: 168 * 169 * If a logical unit has executed a PERSISTENT RESERVE OUT 170 * command with the REGISTER or the REGISTER AND IGNORE 171 * EXISTING KEY service action and is still registered by any 172 * initiator, all RESERVE commands and all RELEASE commands 173 * regardless of initiator shall conflict and shall terminate 174 * with a RESERVATION CONFLICT status. 175 */ 176 spin_lock(&pr_tmpl->registration_lock); 177 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 178 spin_unlock(&pr_tmpl->registration_lock); 179 } 180 181 if (conflict) { 182 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 183 " while active SPC-3 registrations exist," 184 " returning RESERVATION_CONFLICT\n"); 185 return -EBUSY; 186 } 187 188 return 0; 189 } 190 191 void target_release_reservation(struct se_device *dev) 192 { 193 dev->reservation_holder = NULL; 194 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 195 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 196 dev->dev_res_bin_isid = 0; 197 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 198 } 199 } 200 201 sense_reason_t 202 target_scsi2_reservation_release(struct se_cmd *cmd) 203 { 204 struct se_device *dev = cmd->se_dev; 205 struct se_session *sess = cmd->se_sess; 206 struct se_portal_group *tpg; 207 int rc; 208 209 if (!sess || !sess->se_tpg) 210 goto out; 211 rc = target_check_scsi2_reservation_conflict(cmd); 212 if (rc == 1) 213 goto out; 214 if (rc < 0) 215 return TCM_RESERVATION_CONFLICT; 216 217 spin_lock(&dev->dev_reservation_lock); 218 if (!dev->reservation_holder || !sess) 219 goto out_unlock; 220 221 if (dev->reservation_holder->se_node_acl != sess->se_node_acl) 222 goto out_unlock; 223 224 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 225 goto out_unlock; 226 227 target_release_reservation(dev); 228 tpg = sess->se_tpg; 229 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 230 " MAPPED LUN: %llu for %s\n", 231 tpg->se_tpg_tfo->fabric_name, 232 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 233 sess->se_node_acl->initiatorname); 234 235 out_unlock: 236 spin_unlock(&dev->dev_reservation_lock); 237 out: 238 target_complete_cmd(cmd, SAM_STAT_GOOD); 239 return 0; 240 } 241 242 sense_reason_t 243 target_scsi2_reservation_reserve(struct se_cmd *cmd) 244 { 245 struct se_device *dev = cmd->se_dev; 246 struct se_session *sess = cmd->se_sess; 247 struct se_portal_group *tpg; 248 sense_reason_t ret = 0; 249 int rc; 250 251 if ((cmd->t_task_cdb[1] & 0x01) && 252 (cmd->t_task_cdb[1] & 0x02)) { 253 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 254 return TCM_UNSUPPORTED_SCSI_OPCODE; 255 } 256 /* 257 * This is currently the case for target_core_mod passthrough struct se_cmd 258 * ops 259 */ 260 if (!sess || !sess->se_tpg) 261 goto out; 262 rc = target_check_scsi2_reservation_conflict(cmd); 263 if (rc == 1) 264 goto out; 265 266 if (rc < 0) 267 return TCM_RESERVATION_CONFLICT; 268 269 tpg = sess->se_tpg; 270 spin_lock(&dev->dev_reservation_lock); 271 if (dev->reservation_holder && 272 dev->reservation_holder->se_node_acl != sess->se_node_acl) { 273 pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n", 274 tpg->se_tpg_tfo->fabric_name); 275 pr_err("Original reserver LUN: %llu %s\n", 276 cmd->se_lun->unpacked_lun, 277 dev->reservation_holder->se_node_acl->initiatorname); 278 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 279 " from %s \n", cmd->se_lun->unpacked_lun, 280 cmd->orig_fe_lun, 281 sess->se_node_acl->initiatorname); 282 ret = TCM_RESERVATION_CONFLICT; 283 goto out_unlock; 284 } 285 286 dev->reservation_holder = sess; 287 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 288 if (sess->sess_bin_isid != 0) { 289 dev->dev_res_bin_isid = sess->sess_bin_isid; 290 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 291 } 292 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 293 " for %s\n", tpg->se_tpg_tfo->fabric_name, 294 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 295 sess->se_node_acl->initiatorname); 296 297 out_unlock: 298 spin_unlock(&dev->dev_reservation_lock); 299 out: 300 if (!ret) 301 target_complete_cmd(cmd, SAM_STAT_GOOD); 302 return ret; 303 } 304 305 306 /* 307 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 308 * 309 * This function is called by those initiator ports who are *NOT* 310 * the active PR reservation holder when a reservation is present. 311 */ 312 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 313 bool isid_mismatch) 314 { 315 unsigned char *cdb = cmd->t_task_cdb; 316 struct se_session *se_sess = cmd->se_sess; 317 struct se_node_acl *nacl = se_sess->se_node_acl; 318 int other_cdb = 0; 319 int registered_nexus = 0, ret = 1; /* Conflict by default */ 320 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 321 int we = 0; /* Write Exclusive */ 322 int legacy = 0; /* Act like a legacy device and return 323 * RESERVATION CONFLICT on some CDBs */ 324 325 if (isid_mismatch) { 326 registered_nexus = 0; 327 } else { 328 struct se_dev_entry *se_deve; 329 330 rcu_read_lock(); 331 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 332 if (se_deve) 333 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 334 &se_deve->deve_flags); 335 rcu_read_unlock(); 336 } 337 338 switch (pr_reg_type) { 339 case PR_TYPE_WRITE_EXCLUSIVE: 340 we = 1; 341 fallthrough; 342 case PR_TYPE_EXCLUSIVE_ACCESS: 343 /* 344 * Some commands are only allowed for the persistent reservation 345 * holder. 346 */ 347 break; 348 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 349 we = 1; 350 fallthrough; 351 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 352 /* 353 * Some commands are only allowed for registered I_T Nexuses. 354 */ 355 reg_only = 1; 356 break; 357 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 358 we = 1; 359 fallthrough; 360 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 361 /* 362 * Each registered I_T Nexus is a reservation holder. 363 */ 364 all_reg = 1; 365 break; 366 default: 367 return -EINVAL; 368 } 369 /* 370 * Referenced from spc4r17 table 45 for *NON* PR holder access 371 */ 372 switch (cdb[0]) { 373 case SECURITY_PROTOCOL_IN: 374 if (registered_nexus) 375 return 0; 376 ret = (we) ? 0 : 1; 377 break; 378 case MODE_SENSE: 379 case MODE_SENSE_10: 380 case READ_ATTRIBUTE: 381 case READ_BUFFER: 382 case RECEIVE_DIAGNOSTIC: 383 if (legacy) { 384 ret = 1; 385 break; 386 } 387 if (registered_nexus) { 388 ret = 0; 389 break; 390 } 391 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 392 break; 393 case PERSISTENT_RESERVE_OUT: 394 /* 395 * This follows PERSISTENT_RESERVE_OUT service actions that 396 * are allowed in the presence of various reservations. 397 * See spc4r17, table 46 398 */ 399 switch (cdb[1] & 0x1f) { 400 case PRO_CLEAR: 401 case PRO_PREEMPT: 402 case PRO_PREEMPT_AND_ABORT: 403 ret = (registered_nexus) ? 0 : 1; 404 break; 405 case PRO_REGISTER: 406 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 407 ret = 0; 408 break; 409 case PRO_REGISTER_AND_MOVE: 410 case PRO_RESERVE: 411 ret = 1; 412 break; 413 case PRO_RELEASE: 414 ret = (registered_nexus) ? 0 : 1; 415 break; 416 default: 417 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 418 " action: 0x%02x\n", cdb[1] & 0x1f); 419 return -EINVAL; 420 } 421 break; 422 case RELEASE_6: 423 case RELEASE_10: 424 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 425 ret = 0; 426 break; 427 case RESERVE_6: 428 case RESERVE_10: 429 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 430 ret = 0; 431 break; 432 case TEST_UNIT_READY: 433 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 434 break; 435 case MAINTENANCE_IN: 436 switch (cdb[1] & 0x1f) { 437 case MI_MANAGEMENT_PROTOCOL_IN: 438 if (registered_nexus) { 439 ret = 0; 440 break; 441 } 442 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 443 break; 444 case MI_REPORT_SUPPORTED_OPERATION_CODES: 445 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 446 if (legacy) { 447 ret = 1; 448 break; 449 } 450 if (registered_nexus) { 451 ret = 0; 452 break; 453 } 454 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 455 break; 456 case MI_REPORT_ALIASES: 457 case MI_REPORT_IDENTIFYING_INFORMATION: 458 case MI_REPORT_PRIORITY: 459 case MI_REPORT_TARGET_PGS: 460 case MI_REPORT_TIMESTAMP: 461 ret = 0; /* Allowed */ 462 break; 463 default: 464 pr_err("Unknown MI Service Action: 0x%02x\n", 465 (cdb[1] & 0x1f)); 466 return -EINVAL; 467 } 468 break; 469 case ACCESS_CONTROL_IN: 470 case ACCESS_CONTROL_OUT: 471 case INQUIRY: 472 case LOG_SENSE: 473 case SERVICE_ACTION_IN_12: 474 case READ_CAPACITY: 475 case REPORT_LUNS: 476 case REQUEST_SENSE: 477 case PERSISTENT_RESERVE_IN: 478 ret = 0; /*/ Allowed CDBs */ 479 break; 480 default: 481 other_cdb = 1; 482 break; 483 } 484 /* 485 * Case where the CDB is explicitly allowed in the above switch 486 * statement. 487 */ 488 if (!ret && !other_cdb) { 489 pr_debug("Allowing explicit CDB: 0x%02x for %s" 490 " reservation holder\n", cdb[0], 491 core_scsi3_pr_dump_type(pr_reg_type)); 492 493 return ret; 494 } 495 /* 496 * Check if write exclusive initiator ports *NOT* holding the 497 * WRITE_EXCLUSIVE_* reservation. 498 */ 499 if (we && !registered_nexus) { 500 if (cmd->data_direction == DMA_TO_DEVICE) { 501 /* 502 * Conflict for write exclusive 503 */ 504 pr_debug("%s Conflict for unregistered nexus" 505 " %s CDB: 0x%02x to %s reservation\n", 506 transport_dump_cmd_direction(cmd), 507 se_sess->se_node_acl->initiatorname, cdb[0], 508 core_scsi3_pr_dump_type(pr_reg_type)); 509 return 1; 510 } else { 511 /* 512 * Allow non WRITE CDBs for all Write Exclusive 513 * PR TYPEs to pass for registered and 514 * non-registered_nexuxes NOT holding the reservation. 515 * 516 * We only make noise for the unregisterd nexuses, 517 * as we expect registered non-reservation holding 518 * nexuses to issue CDBs. 519 */ 520 521 if (!registered_nexus) { 522 pr_debug("Allowing implicit CDB: 0x%02x" 523 " for %s reservation on unregistered" 524 " nexus\n", cdb[0], 525 core_scsi3_pr_dump_type(pr_reg_type)); 526 } 527 528 return 0; 529 } 530 } else if ((reg_only) || (all_reg)) { 531 if (registered_nexus) { 532 /* 533 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 534 * allow commands from registered nexuses. 535 */ 536 537 pr_debug("Allowing implicit CDB: 0x%02x for %s" 538 " reservation\n", cdb[0], 539 core_scsi3_pr_dump_type(pr_reg_type)); 540 541 return 0; 542 } 543 } else if (we && registered_nexus) { 544 /* 545 * Reads are allowed for Write Exclusive locks 546 * from all registrants. 547 */ 548 if (cmd->data_direction == DMA_FROM_DEVICE) { 549 pr_debug("Allowing READ CDB: 0x%02x for %s" 550 " reservation\n", cdb[0], 551 core_scsi3_pr_dump_type(pr_reg_type)); 552 553 return 0; 554 } 555 } 556 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 557 " for %s reservation\n", transport_dump_cmd_direction(cmd), 558 (registered_nexus) ? "" : "un", 559 se_sess->se_node_acl->initiatorname, cdb[0], 560 core_scsi3_pr_dump_type(pr_reg_type)); 561 562 return 1; /* Conflict by default */ 563 } 564 565 static sense_reason_t 566 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 567 { 568 struct se_device *dev = cmd->se_dev; 569 struct se_session *sess = cmd->se_sess; 570 u32 pr_reg_type; 571 bool isid_mismatch = false; 572 573 if (!dev->dev_pr_res_holder) 574 return 0; 575 576 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 577 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 578 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 579 goto check_nonholder; 580 581 if (dev->dev_pr_res_holder->isid_present_at_reg) { 582 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 583 sess->sess_bin_isid) { 584 isid_mismatch = true; 585 goto check_nonholder; 586 } 587 } 588 589 return 0; 590 591 check_nonholder: 592 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 593 return TCM_RESERVATION_CONFLICT; 594 return 0; 595 } 596 597 static u32 core_scsi3_pr_generation(struct se_device *dev) 598 { 599 u32 prg; 600 601 /* 602 * PRGeneration field shall contain the value of a 32-bit wrapping 603 * counter mainted by the device server. 604 * 605 * Note that this is done regardless of Active Persist across 606 * Target PowerLoss (APTPL) 607 * 608 * See spc4r17 section 6.3.12 READ_KEYS service action 609 */ 610 spin_lock(&dev->dev_reservation_lock); 611 prg = dev->t10_pr.pr_generation++; 612 spin_unlock(&dev->dev_reservation_lock); 613 614 return prg; 615 } 616 617 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 618 struct se_device *dev, 619 struct se_node_acl *nacl, 620 struct se_lun *lun, 621 struct se_dev_entry *dest_deve, 622 u64 mapped_lun, 623 unsigned char *isid, 624 u64 sa_res_key, 625 int all_tg_pt, 626 int aptpl) 627 { 628 struct t10_pr_registration *pr_reg; 629 630 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 631 if (!pr_reg) { 632 pr_err("Unable to allocate struct t10_pr_registration\n"); 633 return NULL; 634 } 635 636 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 637 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 641 atomic_set(&pr_reg->pr_res_holders, 0); 642 pr_reg->pr_reg_nacl = nacl; 643 /* 644 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 645 * the se_dev_entry->pr_ref will have been already obtained by 646 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 647 * 648 * Otherwise, locate se_dev_entry now and obtain a reference until 649 * registration completes in __core_scsi3_add_registration(). 650 */ 651 if (dest_deve) { 652 pr_reg->pr_reg_deve = dest_deve; 653 } else { 654 rcu_read_lock(); 655 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 656 if (!pr_reg->pr_reg_deve) { 657 rcu_read_unlock(); 658 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 659 nacl->initiatorname, mapped_lun); 660 kmem_cache_free(t10_pr_reg_cache, pr_reg); 661 return NULL; 662 } 663 kref_get(&pr_reg->pr_reg_deve->pr_kref); 664 rcu_read_unlock(); 665 } 666 pr_reg->pr_res_mapped_lun = mapped_lun; 667 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 668 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 669 pr_reg->pr_res_key = sa_res_key; 670 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 671 pr_reg->pr_reg_aptpl = aptpl; 672 /* 673 * If an ISID value for this SCSI Initiator Port exists, 674 * save it to the registration now. 675 */ 676 if (isid != NULL) { 677 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 678 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 679 pr_reg->isid_present_at_reg = 1; 680 } 681 682 return pr_reg; 683 } 684 685 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 686 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 687 688 /* 689 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 690 * modes. 691 */ 692 static struct t10_pr_registration *__core_scsi3_alloc_registration( 693 struct se_device *dev, 694 struct se_node_acl *nacl, 695 struct se_lun *lun, 696 struct se_dev_entry *deve, 697 u64 mapped_lun, 698 unsigned char *isid, 699 u64 sa_res_key, 700 int all_tg_pt, 701 int aptpl) 702 { 703 struct se_dev_entry *deve_tmp; 704 struct se_node_acl *nacl_tmp; 705 struct se_lun_acl *lacl_tmp; 706 struct se_lun *lun_tmp, *next, *dest_lun; 707 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 708 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 709 int ret; 710 /* 711 * Create a registration for the I_T Nexus upon which the 712 * PROUT REGISTER was received. 713 */ 714 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 715 isid, sa_res_key, all_tg_pt, 716 aptpl); 717 if (!pr_reg) 718 return NULL; 719 /* 720 * Return pointer to pr_reg for ALL_TG_PT=0 721 */ 722 if (!all_tg_pt) 723 return pr_reg; 724 /* 725 * Create list of matching SCSI Initiator Port registrations 726 * for ALL_TG_PT=1 727 */ 728 spin_lock(&dev->se_port_lock); 729 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 730 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 731 continue; 732 spin_unlock(&dev->se_port_lock); 733 734 spin_lock(&lun_tmp->lun_deve_lock); 735 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 736 /* 737 * This pointer will be NULL for demo mode MappedLUNs 738 * that have not been make explicit via a ConfigFS 739 * MappedLUN group for the SCSI Initiator Node ACL. 740 */ 741 if (!deve_tmp->se_lun_acl) 742 continue; 743 744 lacl_tmp = deve_tmp->se_lun_acl; 745 nacl_tmp = lacl_tmp->se_lun_nacl; 746 /* 747 * Skip the matching struct se_node_acl that is allocated 748 * above.. 749 */ 750 if (nacl == nacl_tmp) 751 continue; 752 /* 753 * Only perform PR registrations for target ports on 754 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 755 * arrived. 756 */ 757 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 758 continue; 759 /* 760 * Look for a matching Initiator Node ACL in ASCII format 761 */ 762 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 763 continue; 764 765 kref_get(&deve_tmp->pr_kref); 766 spin_unlock(&lun_tmp->lun_deve_lock); 767 /* 768 * Grab a configfs group dependency that is released 769 * for the exception path at label out: below, or upon 770 * completion of adding ALL_TG_PT=1 registrations in 771 * __core_scsi3_add_registration() 772 */ 773 ret = core_scsi3_lunacl_depend_item(deve_tmp); 774 if (ret < 0) { 775 pr_err("core_scsi3_lunacl_depend" 776 "_item() failed\n"); 777 percpu_ref_put(&lun_tmp->lun_ref); 778 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 779 goto out; 780 } 781 /* 782 * Located a matching SCSI Initiator Port on a different 783 * port, allocate the pr_reg_atp and attach it to the 784 * pr_reg->pr_reg_atp_list that will be processed once 785 * the original *pr_reg is processed in 786 * __core_scsi3_add_registration() 787 */ 788 dest_lun = deve_tmp->se_lun; 789 790 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 791 nacl_tmp, dest_lun, deve_tmp, 792 deve_tmp->mapped_lun, NULL, 793 sa_res_key, all_tg_pt, aptpl); 794 if (!pr_reg_atp) { 795 percpu_ref_put(&lun_tmp->lun_ref); 796 core_scsi3_lunacl_undepend_item(deve_tmp); 797 goto out; 798 } 799 800 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 801 &pr_reg->pr_reg_atp_list); 802 spin_lock(&lun_tmp->lun_deve_lock); 803 } 804 spin_unlock(&lun_tmp->lun_deve_lock); 805 806 spin_lock(&dev->se_port_lock); 807 percpu_ref_put(&lun_tmp->lun_ref); 808 } 809 spin_unlock(&dev->se_port_lock); 810 811 return pr_reg; 812 out: 813 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 814 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 815 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 816 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 817 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 818 } 819 kmem_cache_free(t10_pr_reg_cache, pr_reg); 820 return NULL; 821 } 822 823 int core_scsi3_alloc_aptpl_registration( 824 struct t10_reservation *pr_tmpl, 825 u64 sa_res_key, 826 unsigned char *i_port, 827 unsigned char *isid, 828 u64 mapped_lun, 829 unsigned char *t_port, 830 u16 tpgt, 831 u64 target_lun, 832 int res_holder, 833 int all_tg_pt, 834 u8 type) 835 { 836 struct t10_pr_registration *pr_reg; 837 838 if (!i_port || !t_port || !sa_res_key) { 839 pr_err("Illegal parameters for APTPL registration\n"); 840 return -EINVAL; 841 } 842 843 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 844 if (!pr_reg) { 845 pr_err("Unable to allocate struct t10_pr_registration\n"); 846 return -ENOMEM; 847 } 848 849 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 850 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 851 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 853 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 854 atomic_set(&pr_reg->pr_res_holders, 0); 855 pr_reg->pr_reg_nacl = NULL; 856 pr_reg->pr_reg_deve = NULL; 857 pr_reg->pr_res_mapped_lun = mapped_lun; 858 pr_reg->pr_aptpl_target_lun = target_lun; 859 pr_reg->pr_res_key = sa_res_key; 860 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 861 pr_reg->pr_reg_aptpl = 1; 862 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 863 pr_reg->pr_res_type = type; 864 /* 865 * If an ISID value had been saved in APTPL metadata for this 866 * SCSI Initiator Port, restore it now. 867 */ 868 if (isid != NULL) { 869 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 870 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 871 pr_reg->isid_present_at_reg = 1; 872 } 873 /* 874 * Copy the i_port and t_port information from caller. 875 */ 876 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 877 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 878 pr_reg->pr_reg_tpgt = tpgt; 879 /* 880 * Set pr_res_holder from caller, the pr_reg who is the reservation 881 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 882 * the Initiator Node LUN ACL from the fabric module is created for 883 * this registration. 884 */ 885 pr_reg->pr_res_holder = res_holder; 886 887 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 888 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 889 " metadata\n", (res_holder) ? "+reservation" : ""); 890 return 0; 891 } 892 893 static void core_scsi3_aptpl_reserve( 894 struct se_device *dev, 895 struct se_portal_group *tpg, 896 struct se_node_acl *node_acl, 897 struct t10_pr_registration *pr_reg) 898 { 899 char i_buf[PR_REG_ISID_ID_LEN] = { }; 900 901 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 902 903 spin_lock(&dev->dev_reservation_lock); 904 dev->dev_pr_res_holder = pr_reg; 905 spin_unlock(&dev->dev_reservation_lock); 906 907 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 908 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 909 tpg->se_tpg_tfo->fabric_name, 910 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 911 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 912 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 913 tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname, 914 i_buf); 915 } 916 917 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 918 struct t10_pr_registration *, enum register_type, int); 919 920 static int __core_scsi3_check_aptpl_registration( 921 struct se_device *dev, 922 struct se_portal_group *tpg, 923 struct se_lun *lun, 924 u64 target_lun, 925 struct se_node_acl *nacl, 926 u64 mapped_lun) 927 { 928 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 929 struct t10_reservation *pr_tmpl = &dev->t10_pr; 930 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { }; 931 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { }; 932 u16 tpgt; 933 934 /* 935 * Copy Initiator Port information from struct se_node_acl 936 */ 937 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 938 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 939 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 940 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 941 /* 942 * Look for the matching registrations+reservation from those 943 * created from APTPL metadata. Note that multiple registrations 944 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 945 * TransportIDs. 946 */ 947 spin_lock(&pr_tmpl->aptpl_reg_lock); 948 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 949 pr_reg_aptpl_list) { 950 951 if (!strcmp(pr_reg->pr_iport, i_port) && 952 (pr_reg->pr_res_mapped_lun == mapped_lun) && 953 !(strcmp(pr_reg->pr_tport, t_port)) && 954 (pr_reg->pr_reg_tpgt == tpgt) && 955 (pr_reg->pr_aptpl_target_lun == target_lun)) { 956 /* 957 * Obtain the ->pr_reg_deve pointer + reference, that 958 * is released by __core_scsi3_add_registration() below. 959 */ 960 rcu_read_lock(); 961 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 962 if (!pr_reg->pr_reg_deve) { 963 pr_err("Unable to locate PR APTPL %s mapped_lun:" 964 " %llu\n", nacl->initiatorname, mapped_lun); 965 rcu_read_unlock(); 966 continue; 967 } 968 kref_get(&pr_reg->pr_reg_deve->pr_kref); 969 rcu_read_unlock(); 970 971 pr_reg->pr_reg_nacl = nacl; 972 pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi; 973 list_del(&pr_reg->pr_reg_aptpl_list); 974 spin_unlock(&pr_tmpl->aptpl_reg_lock); 975 /* 976 * At this point all of the pointers in *pr_reg will 977 * be setup, so go ahead and add the registration. 978 */ 979 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 980 /* 981 * If this registration is the reservation holder, 982 * make that happen now.. 983 */ 984 if (pr_reg->pr_res_holder) 985 core_scsi3_aptpl_reserve(dev, tpg, 986 nacl, pr_reg); 987 /* 988 * Reenable pr_aptpl_active to accept new metadata 989 * updates once the SCSI device is active again.. 990 */ 991 spin_lock(&pr_tmpl->aptpl_reg_lock); 992 pr_tmpl->pr_aptpl_active = 1; 993 } 994 } 995 spin_unlock(&pr_tmpl->aptpl_reg_lock); 996 997 return 0; 998 } 999 1000 int core_scsi3_check_aptpl_registration( 1001 struct se_device *dev, 1002 struct se_portal_group *tpg, 1003 struct se_lun *lun, 1004 struct se_node_acl *nacl, 1005 u64 mapped_lun) 1006 { 1007 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1008 return 0; 1009 1010 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1011 lun->unpacked_lun, nacl, 1012 mapped_lun); 1013 } 1014 1015 static void __core_scsi3_dump_registration( 1016 const struct target_core_fabric_ops *tfo, 1017 struct se_device *dev, 1018 struct se_node_acl *nacl, 1019 struct t10_pr_registration *pr_reg, 1020 enum register_type register_type) 1021 { 1022 struct se_portal_group *se_tpg = nacl->se_tpg; 1023 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1024 1025 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1026 1027 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1028 " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ? 1029 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1030 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1031 i_buf); 1032 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1033 tfo->fabric_name, tfo->tpg_get_wwn(se_tpg), 1034 tfo->tpg_get_tag(se_tpg)); 1035 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1036 " Port(s)\n", tfo->fabric_name, 1037 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1038 dev->transport->name); 1039 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1040 " 0x%08x APTPL: %d\n", tfo->fabric_name, 1041 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1042 pr_reg->pr_reg_aptpl); 1043 } 1044 1045 static void __core_scsi3_add_registration( 1046 struct se_device *dev, 1047 struct se_node_acl *nacl, 1048 struct t10_pr_registration *pr_reg, 1049 enum register_type register_type, 1050 int register_move) 1051 { 1052 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1053 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1054 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1055 struct se_dev_entry *deve; 1056 1057 /* 1058 * Increment PRgeneration counter for struct se_device upon a successful 1059 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1060 * 1061 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1062 * action, the struct se_device->dev_reservation_lock will already be held, 1063 * so we do not call core_scsi3_pr_generation() which grabs the lock 1064 * for the REGISTER. 1065 */ 1066 pr_reg->pr_res_generation = (register_move) ? 1067 dev->t10_pr.pr_generation++ : 1068 core_scsi3_pr_generation(dev); 1069 1070 spin_lock(&pr_tmpl->registration_lock); 1071 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1072 1073 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1074 spin_unlock(&pr_tmpl->registration_lock); 1075 /* 1076 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1077 */ 1078 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1079 goto out; 1080 /* 1081 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1082 * allocated in __core_scsi3_alloc_registration() 1083 */ 1084 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1085 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1086 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1087 1088 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1089 1090 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1091 1092 spin_lock(&pr_tmpl->registration_lock); 1093 list_add_tail(&pr_reg_tmp->pr_reg_list, 1094 &pr_tmpl->registration_list); 1095 1096 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1097 register_type); 1098 spin_unlock(&pr_tmpl->registration_lock); 1099 /* 1100 * Drop configfs group dependency reference and deve->pr_kref 1101 * obtained from __core_scsi3_alloc_registration() code. 1102 */ 1103 rcu_read_lock(); 1104 deve = pr_reg_tmp->pr_reg_deve; 1105 if (deve) { 1106 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1107 core_scsi3_lunacl_undepend_item(deve); 1108 pr_reg_tmp->pr_reg_deve = NULL; 1109 } 1110 rcu_read_unlock(); 1111 } 1112 out: 1113 /* 1114 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1115 */ 1116 rcu_read_lock(); 1117 deve = pr_reg->pr_reg_deve; 1118 if (deve) { 1119 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1120 kref_put(&deve->pr_kref, target_pr_kref_release); 1121 pr_reg->pr_reg_deve = NULL; 1122 } 1123 rcu_read_unlock(); 1124 } 1125 1126 static int core_scsi3_alloc_registration( 1127 struct se_device *dev, 1128 struct se_node_acl *nacl, 1129 struct se_lun *lun, 1130 struct se_dev_entry *deve, 1131 u64 mapped_lun, 1132 unsigned char *isid, 1133 u64 sa_res_key, 1134 int all_tg_pt, 1135 int aptpl, 1136 enum register_type register_type, 1137 int register_move) 1138 { 1139 struct t10_pr_registration *pr_reg; 1140 1141 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1142 isid, sa_res_key, all_tg_pt, 1143 aptpl); 1144 if (!pr_reg) 1145 return -EPERM; 1146 1147 __core_scsi3_add_registration(dev, nacl, pr_reg, 1148 register_type, register_move); 1149 return 0; 1150 } 1151 1152 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1153 struct se_device *dev, 1154 struct se_node_acl *nacl, 1155 unsigned char *isid) 1156 { 1157 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1158 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1159 1160 spin_lock(&pr_tmpl->registration_lock); 1161 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1162 &pr_tmpl->registration_list, pr_reg_list) { 1163 /* 1164 * First look for a matching struct se_node_acl 1165 */ 1166 if (pr_reg->pr_reg_nacl != nacl) 1167 continue; 1168 1169 /* 1170 * If this registration does NOT contain a fabric provided 1171 * ISID, then we have found a match. 1172 */ 1173 if (!pr_reg->isid_present_at_reg) { 1174 atomic_inc_mb(&pr_reg->pr_res_holders); 1175 spin_unlock(&pr_tmpl->registration_lock); 1176 return pr_reg; 1177 } 1178 /* 1179 * If the *pr_reg contains a fabric defined ISID for multi-value 1180 * SCSI Initiator Port TransportIDs, then we expect a valid 1181 * matching ISID to be provided by the local SCSI Initiator Port. 1182 */ 1183 if (!isid) 1184 continue; 1185 if (strcmp(isid, pr_reg->pr_reg_isid)) 1186 continue; 1187 1188 atomic_inc_mb(&pr_reg->pr_res_holders); 1189 spin_unlock(&pr_tmpl->registration_lock); 1190 return pr_reg; 1191 } 1192 spin_unlock(&pr_tmpl->registration_lock); 1193 1194 return NULL; 1195 } 1196 1197 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1198 struct se_device *dev, 1199 struct se_node_acl *nacl, 1200 struct se_session *sess) 1201 { 1202 struct se_portal_group *tpg = nacl->se_tpg; 1203 unsigned char buf[PR_REG_ISID_LEN] = { }; 1204 unsigned char *isid_ptr = NULL; 1205 1206 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1207 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1208 PR_REG_ISID_LEN); 1209 isid_ptr = &buf[0]; 1210 } 1211 1212 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1213 } 1214 1215 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1216 { 1217 atomic_dec_mb(&pr_reg->pr_res_holders); 1218 } 1219 1220 static int core_scsi3_check_implicit_release( 1221 struct se_device *dev, 1222 struct t10_pr_registration *pr_reg) 1223 { 1224 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1225 struct t10_pr_registration *pr_res_holder; 1226 int ret = 0; 1227 1228 spin_lock(&dev->dev_reservation_lock); 1229 pr_res_holder = dev->dev_pr_res_holder; 1230 if (!pr_res_holder) { 1231 spin_unlock(&dev->dev_reservation_lock); 1232 return ret; 1233 } 1234 if (pr_res_holder == pr_reg) { 1235 /* 1236 * Perform an implicit RELEASE if the registration that 1237 * is being released is holding the reservation. 1238 * 1239 * From spc4r17, section 5.7.11.1: 1240 * 1241 * e) If the I_T nexus is the persistent reservation holder 1242 * and the persistent reservation is not an all registrants 1243 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1244 * service action or REGISTER AND IGNORE EXISTING KEY 1245 * service action with the SERVICE ACTION RESERVATION KEY 1246 * field set to zero (see 5.7.11.3). 1247 */ 1248 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1249 ret = 1; 1250 /* 1251 * For 'All Registrants' reservation types, all existing 1252 * registrations are still processed as reservation holders 1253 * in core_scsi3_pr_seq_non_holder() after the initial 1254 * reservation holder is implicitly released here. 1255 */ 1256 } else if (pr_reg->pr_reg_all_tg_pt && 1257 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1258 pr_reg->pr_reg_nacl->initiatorname)) && 1259 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1260 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1261 " UNREGISTER while existing reservation with matching" 1262 " key 0x%016Lx is present from another SCSI Initiator" 1263 " Port\n", pr_reg->pr_res_key); 1264 ret = -EPERM; 1265 } 1266 spin_unlock(&dev->dev_reservation_lock); 1267 1268 return ret; 1269 } 1270 1271 static void __core_scsi3_free_registration( 1272 struct se_device *dev, 1273 struct t10_pr_registration *pr_reg, 1274 struct list_head *preempt_and_abort_list, 1275 int dec_holders) 1276 __releases(&pr_tmpl->registration_lock) 1277 __acquires(&pr_tmpl->registration_lock) 1278 { 1279 const struct target_core_fabric_ops *tfo = 1280 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1281 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1282 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1283 struct se_dev_entry *deve; 1284 char i_buf[PR_REG_ISID_ID_LEN] = { }; 1285 1286 lockdep_assert_held(&pr_tmpl->registration_lock); 1287 1288 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1289 1290 if (!list_empty(&pr_reg->pr_reg_list)) 1291 list_del(&pr_reg->pr_reg_list); 1292 /* 1293 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1294 * so call core_scsi3_put_pr_reg() to decrement our reference. 1295 */ 1296 if (dec_holders) 1297 core_scsi3_put_pr_reg(pr_reg); 1298 1299 spin_unlock(&pr_tmpl->registration_lock); 1300 /* 1301 * Wait until all reference from any other I_T nexuses for this 1302 * *pr_reg have been released. Because list_del() is called above, 1303 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1304 * count back to zero, and we release *pr_reg. 1305 */ 1306 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1307 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1308 tfo->fabric_name); 1309 cpu_relax(); 1310 } 1311 1312 rcu_read_lock(); 1313 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1314 if (deve) 1315 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1316 rcu_read_unlock(); 1317 1318 spin_lock(&pr_tmpl->registration_lock); 1319 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1320 " Node: %s%s\n", tfo->fabric_name, 1321 pr_reg->pr_reg_nacl->initiatorname, 1322 i_buf); 1323 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1324 " Port(s)\n", tfo->fabric_name, 1325 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1326 dev->transport->name); 1327 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1328 " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key, 1329 pr_reg->pr_res_generation); 1330 1331 if (!preempt_and_abort_list) { 1332 pr_reg->pr_reg_deve = NULL; 1333 pr_reg->pr_reg_nacl = NULL; 1334 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1335 return; 1336 } 1337 /* 1338 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1339 * are released once the ABORT_TASK_SET has completed.. 1340 */ 1341 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1342 } 1343 1344 void core_scsi3_free_pr_reg_from_nacl( 1345 struct se_device *dev, 1346 struct se_node_acl *nacl) 1347 { 1348 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1349 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1350 bool free_reg = false; 1351 /* 1352 * If the passed se_node_acl matches the reservation holder, 1353 * release the reservation. 1354 */ 1355 spin_lock(&dev->dev_reservation_lock); 1356 pr_res_holder = dev->dev_pr_res_holder; 1357 if ((pr_res_holder != NULL) && 1358 (pr_res_holder->pr_reg_nacl == nacl)) { 1359 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1360 free_reg = true; 1361 } 1362 spin_unlock(&dev->dev_reservation_lock); 1363 /* 1364 * Release any registration associated with the struct se_node_acl. 1365 */ 1366 spin_lock(&pr_tmpl->registration_lock); 1367 if (pr_res_holder && free_reg) 1368 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1369 1370 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1371 &pr_tmpl->registration_list, pr_reg_list) { 1372 1373 if (pr_reg->pr_reg_nacl != nacl) 1374 continue; 1375 1376 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1377 } 1378 spin_unlock(&pr_tmpl->registration_lock); 1379 } 1380 1381 void core_scsi3_free_all_registrations( 1382 struct se_device *dev) 1383 { 1384 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1385 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1386 1387 spin_lock(&dev->dev_reservation_lock); 1388 pr_res_holder = dev->dev_pr_res_holder; 1389 if (pr_res_holder != NULL) { 1390 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1391 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1392 pr_res_holder, 0, 0); 1393 } 1394 spin_unlock(&dev->dev_reservation_lock); 1395 1396 spin_lock(&pr_tmpl->registration_lock); 1397 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1398 &pr_tmpl->registration_list, pr_reg_list) { 1399 1400 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1401 } 1402 spin_unlock(&pr_tmpl->registration_lock); 1403 1404 spin_lock(&pr_tmpl->aptpl_reg_lock); 1405 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1406 pr_reg_aptpl_list) { 1407 list_del(&pr_reg->pr_reg_aptpl_list); 1408 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1409 } 1410 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1411 } 1412 1413 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1414 { 1415 return target_depend_item(&tpg->tpg_group.cg_item); 1416 } 1417 1418 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1419 { 1420 target_undepend_item(&tpg->tpg_group.cg_item); 1421 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1422 } 1423 1424 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1425 { 1426 if (nacl->dynamic_node_acl) 1427 return 0; 1428 return target_depend_item(&nacl->acl_group.cg_item); 1429 } 1430 1431 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1432 { 1433 if (!nacl->dynamic_node_acl) 1434 target_undepend_item(&nacl->acl_group.cg_item); 1435 atomic_dec_mb(&nacl->acl_pr_ref_count); 1436 } 1437 1438 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1439 { 1440 /* 1441 * For nacl->dynamic_node_acl=1 1442 */ 1443 if (!se_deve->se_lun_acl) 1444 return 0; 1445 1446 return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1447 } 1448 1449 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1450 { 1451 /* 1452 * For nacl->dynamic_node_acl=1 1453 */ 1454 if (!se_deve->se_lun_acl) { 1455 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1456 return; 1457 } 1458 1459 target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item); 1460 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1461 } 1462 1463 static sense_reason_t 1464 core_scsi3_decode_spec_i_port( 1465 struct se_cmd *cmd, 1466 struct se_portal_group *tpg, 1467 unsigned char *l_isid, 1468 u64 sa_res_key, 1469 int all_tg_pt, 1470 int aptpl) 1471 { 1472 struct se_device *dev = cmd->se_dev; 1473 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1474 struct se_session *se_sess = cmd->se_sess; 1475 struct se_node_acl *dest_node_acl = NULL; 1476 struct se_dev_entry *dest_se_deve = NULL; 1477 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1478 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1479 LIST_HEAD(tid_dest_list); 1480 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1481 unsigned char *buf, *ptr, proto_ident; 1482 unsigned char i_str[TRANSPORT_IQN_LEN]; 1483 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1484 sense_reason_t ret; 1485 u32 tpdl, tid_len = 0; 1486 u32 dest_rtpi = 0; 1487 bool tid_found; 1488 1489 /* 1490 * Allocate a struct pr_transport_id_holder and setup the 1491 * local_node_acl pointer and add to struct list_head tid_dest_list 1492 * for add registration processing in the loop of tid_dest_list below. 1493 */ 1494 tidh_new = kzalloc_obj(struct pr_transport_id_holder); 1495 if (!tidh_new) { 1496 pr_err("Unable to allocate tidh_new\n"); 1497 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1498 } 1499 INIT_LIST_HEAD(&tidh_new->dest_list); 1500 tidh_new->dest_tpg = tpg; 1501 tidh_new->dest_node_acl = se_sess->se_node_acl; 1502 1503 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1504 se_sess->se_node_acl, cmd->se_lun, 1505 NULL, cmd->orig_fe_lun, l_isid, 1506 sa_res_key, all_tg_pt, aptpl); 1507 if (!local_pr_reg) { 1508 kfree(tidh_new); 1509 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1510 } 1511 1512 if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) { 1513 kfree(tidh_new); 1514 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1515 target_pr_kref_release); 1516 kmem_cache_free(t10_pr_reg_cache, local_pr_reg); 1517 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1518 } 1519 1520 tidh_new->dest_pr_reg = local_pr_reg; 1521 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1522 1523 if (cmd->data_length < 28) { 1524 pr_warn("SPC-PR: Received PR OUT parameter list" 1525 " length too small: %u\n", cmd->data_length); 1526 ret = TCM_INVALID_PARAMETER_LIST; 1527 goto out; 1528 } 1529 1530 buf = transport_kmap_data_sg(cmd); 1531 if (!buf) { 1532 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1533 goto out; 1534 } 1535 1536 /* 1537 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1538 * first extract TransportID Parameter Data Length, and make sure 1539 * the value matches up to the SCSI expected data transfer length. 1540 */ 1541 tpdl = get_unaligned_be32(&buf[24]); 1542 1543 if ((tpdl + 28) != cmd->data_length) { 1544 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1545 " does not equal CDB data_length: %u\n", tpdl, 1546 cmd->data_length); 1547 ret = TCM_INVALID_PARAMETER_LIST; 1548 goto out_unmap; 1549 } 1550 /* 1551 * Start processing the received transport IDs using the 1552 * receiving I_T Nexus portal's fabric dependent methods to 1553 * obtain the SCSI Initiator Port/Device Identifiers. 1554 */ 1555 ptr = &buf[28]; 1556 1557 while (tpdl > 0) { 1558 struct se_lun *dest_lun, *tmp_lun; 1559 1560 proto_ident = (ptr[0] & 0x0f); 1561 dest_tpg = NULL; 1562 1563 spin_lock(&dev->se_port_lock); 1564 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1565 tmp_tpg = tmp_lun->lun_tpg; 1566 1567 /* 1568 * Look for the matching proto_ident provided by 1569 * the received TransportID 1570 */ 1571 if (tmp_tpg->proto_id != proto_ident) 1572 continue; 1573 dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi; 1574 1575 iport_ptr = NULL; 1576 tid_found = target_parse_pr_out_transport_id(tmp_tpg, 1577 ptr, tpdl, &tid_len, &iport_ptr, i_str); 1578 if (!tid_found) 1579 continue; 1580 /* 1581 * Determine if this SCSI device server requires that 1582 * SCSI Intiatior TransportID w/ ISIDs is enforced 1583 * for fabric modules (iSCSI) requiring them. 1584 */ 1585 if (tpg->se_tpg_tfo->sess_get_initiator_sid && 1586 dev->dev_attrib.enforce_pr_isids && 1587 !iport_ptr) { 1588 pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.", 1589 i_str); 1590 ret = TCM_INVALID_PARAMETER_LIST; 1591 spin_unlock(&dev->se_port_lock); 1592 goto out_unmap; 1593 } 1594 1595 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1596 spin_unlock(&dev->se_port_lock); 1597 1598 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1599 pr_err(" core_scsi3_tpg_depend_item()" 1600 " for tmp_tpg\n"); 1601 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1602 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1603 goto out_unmap; 1604 } 1605 /* 1606 * Locate the destination initiator ACL to be registered 1607 * from the decoded fabric module specific TransportID 1608 * at *i_str. 1609 */ 1610 mutex_lock(&tmp_tpg->acl_node_mutex); 1611 dest_node_acl = __core_tpg_get_initiator_node_acl( 1612 tmp_tpg, i_str); 1613 if (dest_node_acl) 1614 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1615 mutex_unlock(&tmp_tpg->acl_node_mutex); 1616 1617 if (!dest_node_acl) { 1618 core_scsi3_tpg_undepend_item(tmp_tpg); 1619 spin_lock(&dev->se_port_lock); 1620 continue; 1621 } 1622 1623 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1624 pr_err("configfs_depend_item() failed" 1625 " for dest_node_acl->acl_group\n"); 1626 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1627 core_scsi3_tpg_undepend_item(tmp_tpg); 1628 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1629 goto out_unmap; 1630 } 1631 1632 dest_tpg = tmp_tpg; 1633 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n", 1634 dest_tpg->se_tpg_tfo->fabric_name, 1635 dest_node_acl->initiatorname, dest_rtpi); 1636 1637 spin_lock(&dev->se_port_lock); 1638 break; 1639 } 1640 spin_unlock(&dev->se_port_lock); 1641 1642 if (!dest_tpg) { 1643 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1644 " dest_tpg\n"); 1645 ret = TCM_INVALID_PARAMETER_LIST; 1646 goto out_unmap; 1647 } 1648 1649 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1650 " tid_len: %d for %s + %s\n", 1651 dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length, 1652 tpdl, tid_len, i_str, iport_ptr); 1653 1654 if (tid_len > tpdl) { 1655 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1656 " %u for Transport ID: %s\n", tid_len, ptr); 1657 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1658 core_scsi3_tpg_undepend_item(dest_tpg); 1659 ret = TCM_INVALID_PARAMETER_LIST; 1660 goto out_unmap; 1661 } 1662 /* 1663 * Locate the desintation struct se_dev_entry pointer for matching 1664 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1665 * Target Port. 1666 */ 1667 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1668 dest_rtpi); 1669 if (!dest_se_deve) { 1670 pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n", 1671 dest_tpg->se_tpg_tfo->fabric_name, 1672 dest_rtpi); 1673 1674 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1675 core_scsi3_tpg_undepend_item(dest_tpg); 1676 ret = TCM_INVALID_PARAMETER_LIST; 1677 goto out_unmap; 1678 } 1679 1680 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1681 pr_err("core_scsi3_lunacl_depend_item()" 1682 " failed\n"); 1683 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1684 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1685 core_scsi3_tpg_undepend_item(dest_tpg); 1686 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1687 goto out_unmap; 1688 } 1689 1690 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1691 " dest_se_deve mapped_lun: %llu\n", 1692 dest_tpg->se_tpg_tfo->fabric_name, 1693 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1694 1695 /* 1696 * Skip any TransportIDs that already have a registration for 1697 * this target port. 1698 */ 1699 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1700 iport_ptr); 1701 if (pr_reg_e) { 1702 core_scsi3_put_pr_reg(pr_reg_e); 1703 core_scsi3_lunacl_undepend_item(dest_se_deve); 1704 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1705 core_scsi3_tpg_undepend_item(dest_tpg); 1706 ptr += tid_len; 1707 tpdl -= tid_len; 1708 tid_len = 0; 1709 continue; 1710 } 1711 /* 1712 * Allocate a struct pr_transport_id_holder and setup 1713 * the dest_node_acl and dest_se_deve pointers for the 1714 * loop below. 1715 */ 1716 tidh_new = kzalloc_obj(struct pr_transport_id_holder); 1717 if (!tidh_new) { 1718 pr_err("Unable to allocate tidh_new\n"); 1719 core_scsi3_lunacl_undepend_item(dest_se_deve); 1720 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1721 core_scsi3_tpg_undepend_item(dest_tpg); 1722 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1723 goto out_unmap; 1724 } 1725 INIT_LIST_HEAD(&tidh_new->dest_list); 1726 tidh_new->dest_tpg = dest_tpg; 1727 tidh_new->dest_node_acl = dest_node_acl; 1728 tidh_new->dest_se_deve = dest_se_deve; 1729 1730 /* 1731 * Allocate, but do NOT add the registration for the 1732 * TransportID referenced SCSI Initiator port. This 1733 * done because of the following from spc4r17 in section 1734 * 6.14.3 wrt SPEC_I_PT: 1735 * 1736 * "If a registration fails for any initiator port (e.g., if th 1737 * logical unit does not have enough resources available to 1738 * hold the registration information), no registrations shall be 1739 * made, and the command shall be terminated with 1740 * CHECK CONDITION status." 1741 * 1742 * That means we call __core_scsi3_alloc_registration() here, 1743 * and then call __core_scsi3_add_registration() in the 1744 * 2nd loop which will never fail. 1745 */ 1746 dest_lun = dest_se_deve->se_lun; 1747 1748 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1749 dest_node_acl, dest_lun, dest_se_deve, 1750 dest_se_deve->mapped_lun, iport_ptr, 1751 sa_res_key, all_tg_pt, aptpl); 1752 if (!dest_pr_reg) { 1753 core_scsi3_lunacl_undepend_item(dest_se_deve); 1754 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1755 core_scsi3_tpg_undepend_item(dest_tpg); 1756 kfree(tidh_new); 1757 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 1758 goto out_unmap; 1759 } 1760 tidh_new->dest_pr_reg = dest_pr_reg; 1761 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1762 1763 ptr += tid_len; 1764 tpdl -= tid_len; 1765 tid_len = 0; 1766 1767 } 1768 1769 transport_kunmap_data_sg(cmd); 1770 1771 /* 1772 * Go ahead and create a registrations from tid_dest_list for the 1773 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1774 * and dest_se_deve. 1775 * 1776 * The SA Reservation Key from the PROUT is set for the 1777 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1778 * means that the TransportID Initiator port will be 1779 * registered on all of the target ports in the SCSI target device 1780 * ALL_TG_PT=0 means the registration will only be for the 1781 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1782 * was received. 1783 */ 1784 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1785 dest_tpg = tidh->dest_tpg; 1786 dest_node_acl = tidh->dest_node_acl; 1787 dest_se_deve = tidh->dest_se_deve; 1788 dest_pr_reg = tidh->dest_pr_reg; 1789 1790 list_del(&tidh->dest_list); 1791 kfree(tidh); 1792 1793 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1794 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1795 1796 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1797 dest_pr_reg, 0, 0); 1798 1799 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1800 " registered Transport ID for Node: %s%s Mapped LUN:" 1801 " %llu\n", dest_tpg->se_tpg_tfo->fabric_name, 1802 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1803 dest_se_deve->mapped_lun : 0); 1804 1805 if (dest_pr_reg == local_pr_reg) 1806 continue; 1807 1808 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1809 core_scsi3_tpg_undepend_item(dest_tpg); 1810 } 1811 1812 return 0; 1813 out_unmap: 1814 transport_kunmap_data_sg(cmd); 1815 out: 1816 /* 1817 * For the failure case, release everything from tid_dest_list 1818 * including *dest_pr_reg and the configfs dependances.. 1819 */ 1820 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1821 bool is_local = false; 1822 1823 dest_tpg = tidh->dest_tpg; 1824 dest_node_acl = tidh->dest_node_acl; 1825 dest_se_deve = tidh->dest_se_deve; 1826 dest_pr_reg = tidh->dest_pr_reg; 1827 1828 if (dest_pr_reg == local_pr_reg) 1829 is_local = true; 1830 1831 list_del(&tidh->dest_list); 1832 kfree(tidh); 1833 /* 1834 * Release any extra ALL_TG_PT=1 registrations for 1835 * the SPEC_I_PT=1 case. 1836 */ 1837 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1838 &dest_pr_reg->pr_reg_atp_list, 1839 pr_reg_atp_mem_list) { 1840 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1841 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1842 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1843 } 1844 1845 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1846 1847 if (dest_se_deve) 1848 core_scsi3_lunacl_undepend_item(dest_se_deve); 1849 1850 if (is_local) 1851 continue; 1852 1853 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1854 core_scsi3_tpg_undepend_item(dest_tpg); 1855 } 1856 return ret; 1857 } 1858 1859 static int core_scsi3_update_aptpl_buf( 1860 struct se_device *dev, 1861 unsigned char *buf, 1862 u32 pr_aptpl_buf_len) 1863 { 1864 struct se_portal_group *tpg; 1865 struct t10_pr_registration *pr_reg; 1866 unsigned char tmp[512], isid_buf[32]; 1867 ssize_t len = 0; 1868 int reg_count = 0; 1869 int ret = 0; 1870 1871 spin_lock(&dev->dev_reservation_lock); 1872 spin_lock(&dev->t10_pr.registration_lock); 1873 /* 1874 * Walk the registration list.. 1875 */ 1876 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1877 pr_reg_list) { 1878 1879 tmp[0] = '\0'; 1880 isid_buf[0] = '\0'; 1881 tpg = pr_reg->pr_reg_nacl->se_tpg; 1882 /* 1883 * Write out any ISID value to APTPL metadata that was included 1884 * in the original registration. 1885 */ 1886 if (pr_reg->isid_present_at_reg) 1887 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1888 pr_reg->pr_reg_isid); 1889 /* 1890 * Include special metadata if the pr_reg matches the 1891 * reservation holder. 1892 */ 1893 if (dev->dev_pr_res_holder == pr_reg) { 1894 snprintf(tmp, 512, "PR_REG_START: %d" 1895 "\ninitiator_fabric=%s\n" 1896 "initiator_node=%s\n%s" 1897 "sa_res_key=%llu\n" 1898 "res_holder=1\nres_type=%02x\n" 1899 "res_scope=%02x\nres_all_tg_pt=%d\n" 1900 "mapped_lun=%llu\n", reg_count, 1901 tpg->se_tpg_tfo->fabric_name, 1902 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1903 pr_reg->pr_res_key, pr_reg->pr_res_type, 1904 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1905 pr_reg->pr_res_mapped_lun); 1906 } else { 1907 snprintf(tmp, 512, "PR_REG_START: %d\n" 1908 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1909 "sa_res_key=%llu\nres_holder=0\n" 1910 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1911 reg_count, tpg->se_tpg_tfo->fabric_name, 1912 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1913 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1914 pr_reg->pr_res_mapped_lun); 1915 } 1916 1917 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1918 pr_err("Unable to update renaming APTPL metadata," 1919 " reallocating larger buffer\n"); 1920 ret = -EMSGSIZE; 1921 goto out; 1922 } 1923 len += sprintf(buf+len, "%s", tmp); 1924 1925 /* 1926 * Include information about the associated SCSI target port. 1927 */ 1928 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1929 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1930 " %d\n", tpg->se_tpg_tfo->fabric_name, 1931 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1932 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1933 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1934 reg_count); 1935 1936 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1937 pr_err("Unable to update renaming APTPL metadata," 1938 " reallocating larger buffer\n"); 1939 ret = -EMSGSIZE; 1940 goto out; 1941 } 1942 len += sprintf(buf+len, "%s", tmp); 1943 reg_count++; 1944 } 1945 1946 if (!reg_count) 1947 len += sprintf(buf+len, "No Registrations or Reservations"); 1948 1949 out: 1950 spin_unlock(&dev->t10_pr.registration_lock); 1951 spin_unlock(&dev->dev_reservation_lock); 1952 1953 return ret; 1954 } 1955 1956 static int __core_scsi3_write_aptpl_to_file( 1957 struct se_device *dev, 1958 unsigned char *buf) 1959 { 1960 struct t10_wwn *wwn = &dev->t10_wwn; 1961 struct file *file; 1962 int flags = O_RDWR | O_CREAT | O_TRUNC; 1963 char *path; 1964 u32 pr_aptpl_buf_len; 1965 int ret; 1966 loff_t pos = 0; 1967 1968 path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, 1969 &wwn->unit_serial[0]); 1970 if (!path) 1971 return -ENOMEM; 1972 1973 scoped_with_init_fs() 1974 file = filp_open(path, flags, 0600); 1975 if (IS_ERR(file)) { 1976 pr_err("filp_open(%s) for APTPL metadata" 1977 " failed\n", path); 1978 kfree(path); 1979 return PTR_ERR(file); 1980 } 1981 1982 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1983 1984 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1985 1986 if (ret < 0) 1987 pr_debug("Error writing APTPL metadata file: %s\n", path); 1988 fput(file); 1989 kfree(path); 1990 1991 return (ret < 0) ? -EIO : 0; 1992 } 1993 1994 /* 1995 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1996 * write out the updated metadata to struct file for this SCSI device. 1997 */ 1998 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1999 { 2000 unsigned char *buf; 2001 int rc, len = PR_APTPL_BUF_LEN; 2002 2003 if (!aptpl) { 2004 char *null_buf = "No Registrations or Reservations\n"; 2005 2006 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2007 dev->t10_pr.pr_aptpl_active = 0; 2008 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2009 2010 if (rc) 2011 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2012 2013 return 0; 2014 } 2015 retry: 2016 buf = vzalloc(len); 2017 if (!buf) 2018 return TCM_OUT_OF_RESOURCES; 2019 2020 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2021 if (rc < 0) { 2022 vfree(buf); 2023 len *= 2; 2024 goto retry; 2025 } 2026 2027 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2028 if (rc != 0) { 2029 pr_err("SPC-3 PR: Could not update APTPL\n"); 2030 vfree(buf); 2031 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2032 } 2033 dev->t10_pr.pr_aptpl_active = 1; 2034 vfree(buf); 2035 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2036 return 0; 2037 } 2038 2039 static sense_reason_t 2040 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2041 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2042 { 2043 struct se_session *se_sess = cmd->se_sess; 2044 struct se_device *dev = cmd->se_dev; 2045 struct se_lun *se_lun = cmd->se_lun; 2046 struct se_portal_group *se_tpg; 2047 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2048 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2049 unsigned char isid_buf[PR_REG_ISID_LEN] = { }; 2050 unsigned char *isid_ptr = NULL; 2051 sense_reason_t ret = TCM_NO_SENSE; 2052 int pr_holder = 0, type; 2053 2054 if (!se_sess || !se_lun) { 2055 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2056 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2057 } 2058 se_tpg = se_sess->se_tpg; 2059 2060 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2061 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2062 PR_REG_ISID_LEN); 2063 isid_ptr = &isid_buf[0]; 2064 } 2065 /* 2066 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2067 */ 2068 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2069 if (!pr_reg) { 2070 if (res_key) { 2071 pr_warn("SPC-3 PR: Reservation Key non-zero" 2072 " for SA REGISTER, returning CONFLICT\n"); 2073 return TCM_RESERVATION_CONFLICT; 2074 } 2075 /* 2076 * Do nothing but return GOOD status. 2077 */ 2078 if (!sa_res_key) 2079 return 0; 2080 2081 if (!spec_i_pt) { 2082 /* 2083 * Perform the Service Action REGISTER on the Initiator 2084 * Port Endpoint that the PRO was received from on the 2085 * Logical Unit of the SCSI device server. 2086 */ 2087 if (core_scsi3_alloc_registration(cmd->se_dev, 2088 se_sess->se_node_acl, cmd->se_lun, 2089 NULL, cmd->orig_fe_lun, isid_ptr, 2090 sa_res_key, all_tg_pt, aptpl, 2091 register_type, 0)) { 2092 pr_err("Unable to allocate" 2093 " struct t10_pr_registration\n"); 2094 return TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 2095 } 2096 } else { 2097 /* 2098 * Register both the Initiator port that received 2099 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2100 * TransportID from Parameter list and loop through 2101 * fabric dependent parameter list while calling 2102 * logic from of core_scsi3_alloc_registration() for 2103 * each TransportID provided SCSI Initiator Port/Device 2104 */ 2105 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2106 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2107 if (ret != 0) 2108 return ret; 2109 } 2110 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2111 } 2112 2113 /* ok, existing registration */ 2114 2115 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2116 pr_err("SPC-3 PR REGISTER: Received" 2117 " res_key: 0x%016Lx does not match" 2118 " existing SA REGISTER res_key:" 2119 " 0x%016Lx\n", res_key, 2120 pr_reg->pr_res_key); 2121 ret = TCM_RESERVATION_CONFLICT; 2122 goto out; 2123 } 2124 2125 if (spec_i_pt) { 2126 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2127 " set on a registered nexus\n"); 2128 ret = TCM_INVALID_PARAMETER_LIST; 2129 goto out; 2130 } 2131 2132 /* 2133 * An existing ALL_TG_PT=1 registration being released 2134 * must also set ALL_TG_PT=1 in the incoming PROUT. 2135 */ 2136 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2137 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2138 " registration exists, but ALL_TG_PT=1 bit not" 2139 " present in received PROUT\n"); 2140 ret = TCM_INVALID_CDB_FIELD; 2141 goto out; 2142 } 2143 2144 /* 2145 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2146 */ 2147 if (sa_res_key) { 2148 /* 2149 * Increment PRgeneration counter for struct se_device" 2150 * upon a successful REGISTER, see spc4r17 section 6.3.2 2151 * READ_KEYS service action. 2152 */ 2153 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2154 pr_reg->pr_res_key = sa_res_key; 2155 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2156 " Key for %s to: 0x%016Lx PRgeneration:" 2157 " 0x%08x\n", cmd->se_tfo->fabric_name, 2158 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2159 pr_reg->pr_reg_nacl->initiatorname, 2160 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2161 2162 } else { 2163 /* 2164 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2165 */ 2166 type = pr_reg->pr_res_type; 2167 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2168 pr_reg); 2169 if (pr_holder < 0) { 2170 ret = TCM_RESERVATION_CONFLICT; 2171 goto out; 2172 } 2173 2174 spin_lock(&pr_tmpl->registration_lock); 2175 /* 2176 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2177 * and matching pr_res_key. 2178 */ 2179 if (pr_reg->pr_reg_all_tg_pt) { 2180 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2181 &pr_tmpl->registration_list, 2182 pr_reg_list) { 2183 2184 if (!pr_reg_p->pr_reg_all_tg_pt) 2185 continue; 2186 if (pr_reg_p->pr_res_key != res_key) 2187 continue; 2188 if (pr_reg == pr_reg_p) 2189 continue; 2190 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2191 pr_reg_p->pr_reg_nacl->initiatorname)) 2192 continue; 2193 2194 __core_scsi3_free_registration(dev, 2195 pr_reg_p, NULL, 0); 2196 } 2197 } 2198 2199 /* 2200 * Release the calling I_T Nexus registration now.. 2201 */ 2202 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2203 pr_reg = NULL; 2204 2205 /* 2206 * From spc4r17, section 5.7.11.3 Unregistering 2207 * 2208 * If the persistent reservation is a registrants only 2209 * type, the device server shall establish a unit 2210 * attention condition for the initiator port associated 2211 * with every registered I_T nexus except for the I_T 2212 * nexus on which the PERSISTENT RESERVE OUT command was 2213 * received, with the additional sense code set to 2214 * RESERVATIONS RELEASED. 2215 */ 2216 if (pr_holder && 2217 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2218 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2219 list_for_each_entry(pr_reg_p, 2220 &pr_tmpl->registration_list, 2221 pr_reg_list) { 2222 2223 target_ua_allocate_lun( 2224 pr_reg_p->pr_reg_nacl, 2225 pr_reg_p->pr_res_mapped_lun, 2226 0x2A, 2227 ASCQ_2AH_RESERVATIONS_RELEASED); 2228 } 2229 } 2230 2231 spin_unlock(&pr_tmpl->registration_lock); 2232 } 2233 2234 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2235 2236 out: 2237 if (pr_reg) 2238 core_scsi3_put_pr_reg(pr_reg); 2239 return ret; 2240 } 2241 2242 unsigned char *core_scsi3_pr_dump_type(int type) 2243 { 2244 switch (type) { 2245 case PR_TYPE_WRITE_EXCLUSIVE: 2246 return "Write Exclusive Access"; 2247 case PR_TYPE_EXCLUSIVE_ACCESS: 2248 return "Exclusive Access"; 2249 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2250 return "Write Exclusive Access, Registrants Only"; 2251 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2252 return "Exclusive Access, Registrants Only"; 2253 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2254 return "Write Exclusive Access, All Registrants"; 2255 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2256 return "Exclusive Access, All Registrants"; 2257 default: 2258 break; 2259 } 2260 2261 return "Unknown SPC-3 PR Type"; 2262 } 2263 2264 static sense_reason_t 2265 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2266 { 2267 struct se_device *dev = cmd->se_dev; 2268 struct se_session *se_sess = cmd->se_sess; 2269 struct se_lun *se_lun = cmd->se_lun; 2270 struct t10_pr_registration *pr_reg, *pr_res_holder; 2271 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2272 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2273 sense_reason_t ret; 2274 2275 if (!se_sess || !se_lun) { 2276 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2277 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2278 } 2279 /* 2280 * Locate the existing *pr_reg via struct se_node_acl pointers 2281 */ 2282 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2283 se_sess); 2284 if (!pr_reg) { 2285 pr_err("SPC-3 PR: Unable to locate" 2286 " PR_REGISTERED *pr_reg for RESERVE\n"); 2287 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2288 } 2289 /* 2290 * From spc4r17 Section 5.7.9: Reserving: 2291 * 2292 * An application client creates a persistent reservation by issuing 2293 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2294 * a registered I_T nexus with the following parameters: 2295 * a) RESERVATION KEY set to the value of the reservation key that is 2296 * registered with the logical unit for the I_T nexus; and 2297 */ 2298 if (res_key != pr_reg->pr_res_key) { 2299 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2300 " does not match existing SA REGISTER res_key:" 2301 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2302 ret = TCM_RESERVATION_CONFLICT; 2303 goto out_put_pr_reg; 2304 } 2305 /* 2306 * From spc4r17 Section 5.7.9: Reserving: 2307 * 2308 * From above: 2309 * b) TYPE field and SCOPE field set to the persistent reservation 2310 * being created. 2311 * 2312 * Only one persistent reservation is allowed at a time per logical unit 2313 * and that persistent reservation has a scope of LU_SCOPE. 2314 */ 2315 if (scope != PR_SCOPE_LU_SCOPE) { 2316 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2317 ret = TCM_INVALID_PARAMETER_LIST; 2318 goto out_put_pr_reg; 2319 } 2320 /* 2321 * See if we have an existing PR reservation holder pointer at 2322 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2323 * *pr_res_holder. 2324 */ 2325 spin_lock(&dev->dev_reservation_lock); 2326 pr_res_holder = dev->dev_pr_res_holder; 2327 if (pr_res_holder) { 2328 /* 2329 * From spc4r17 Section 5.7.9: Reserving: 2330 * 2331 * If the device server receives a PERSISTENT RESERVE OUT 2332 * command from an I_T nexus other than a persistent reservation 2333 * holder (see 5.7.10) that attempts to create a persistent 2334 * reservation when a persistent reservation already exists for 2335 * the logical unit, then the command shall be completed with 2336 * RESERVATION CONFLICT status. 2337 */ 2338 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2339 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2340 pr_err("SPC-3 PR: Attempted RESERVE from" 2341 " [%s]: %s while reservation already held by" 2342 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2343 cmd->se_tfo->fabric_name, 2344 se_sess->se_node_acl->initiatorname, 2345 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2346 pr_res_holder->pr_reg_nacl->initiatorname); 2347 2348 spin_unlock(&dev->dev_reservation_lock); 2349 ret = TCM_RESERVATION_CONFLICT; 2350 goto out_put_pr_reg; 2351 } 2352 /* 2353 * From spc4r17 Section 5.7.9: Reserving: 2354 * 2355 * If a persistent reservation holder attempts to modify the 2356 * type or scope of an existing persistent reservation, the 2357 * command shall be completed with RESERVATION CONFLICT status. 2358 */ 2359 if ((pr_res_holder->pr_res_type != type) || 2360 (pr_res_holder->pr_res_scope != scope)) { 2361 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2362 pr_err("SPC-3 PR: Attempted RESERVE from" 2363 " [%s]: %s trying to change TYPE and/or SCOPE," 2364 " while reservation already held by [%s]: %s," 2365 " returning RESERVATION_CONFLICT\n", 2366 cmd->se_tfo->fabric_name, 2367 se_sess->se_node_acl->initiatorname, 2368 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2369 pr_res_holder->pr_reg_nacl->initiatorname); 2370 2371 spin_unlock(&dev->dev_reservation_lock); 2372 ret = TCM_RESERVATION_CONFLICT; 2373 goto out_put_pr_reg; 2374 } 2375 /* 2376 * From spc4r17 Section 5.7.9: Reserving: 2377 * 2378 * If the device server receives a PERSISTENT RESERVE OUT 2379 * command with RESERVE service action where the TYPE field and 2380 * the SCOPE field contain the same values as the existing type 2381 * and scope from a persistent reservation holder, it shall not 2382 * make any change to the existing persistent reservation and 2383 * shall completethe command with GOOD status. 2384 */ 2385 spin_unlock(&dev->dev_reservation_lock); 2386 ret = 0; 2387 goto out_put_pr_reg; 2388 } 2389 /* 2390 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2391 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2392 */ 2393 pr_reg->pr_res_scope = scope; 2394 pr_reg->pr_res_type = type; 2395 pr_reg->pr_res_holder = 1; 2396 dev->dev_pr_res_holder = pr_reg; 2397 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2398 2399 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2400 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2401 cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type), 2402 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2403 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2404 cmd->se_tfo->fabric_name, 2405 se_sess->se_node_acl->initiatorname, 2406 i_buf); 2407 spin_unlock(&dev->dev_reservation_lock); 2408 2409 if (pr_tmpl->pr_aptpl_active) 2410 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2411 2412 ret = 0; 2413 out_put_pr_reg: 2414 core_scsi3_put_pr_reg(pr_reg); 2415 return ret; 2416 } 2417 2418 static sense_reason_t 2419 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2420 u64 res_key) 2421 { 2422 switch (type) { 2423 case PR_TYPE_WRITE_EXCLUSIVE: 2424 case PR_TYPE_EXCLUSIVE_ACCESS: 2425 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2426 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2427 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2428 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2429 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2430 default: 2431 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2432 " 0x%02x\n", type); 2433 return TCM_INVALID_CDB_FIELD; 2434 } 2435 } 2436 2437 static void __core_scsi3_complete_pro_release( 2438 struct se_device *dev, 2439 struct se_node_acl *se_nacl, 2440 struct t10_pr_registration *pr_reg, 2441 int explicit, 2442 int unreg) 2443 { 2444 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2445 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2446 int pr_res_type = 0, pr_res_scope = 0; 2447 2448 lockdep_assert_held(&dev->dev_reservation_lock); 2449 2450 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2451 /* 2452 * Go ahead and release the current PR reservation holder. 2453 * If an All Registrants reservation is currently active and 2454 * a unregister operation is requested, replace the current 2455 * dev_pr_res_holder with another active registration. 2456 */ 2457 if (dev->dev_pr_res_holder) { 2458 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2459 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2460 dev->dev_pr_res_holder->pr_res_type = 0; 2461 dev->dev_pr_res_holder->pr_res_scope = 0; 2462 dev->dev_pr_res_holder->pr_res_holder = 0; 2463 dev->dev_pr_res_holder = NULL; 2464 } 2465 if (!unreg) 2466 goto out; 2467 2468 spin_lock(&dev->t10_pr.registration_lock); 2469 list_del_init(&pr_reg->pr_reg_list); 2470 /* 2471 * If the I_T nexus is a reservation holder, the persistent reservation 2472 * is of an all registrants type, and the I_T nexus is the last remaining 2473 * registered I_T nexus, then the device server shall also release the 2474 * persistent reservation. 2475 */ 2476 if (!list_empty(&dev->t10_pr.registration_list) && 2477 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2478 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2479 dev->dev_pr_res_holder = 2480 list_entry(dev->t10_pr.registration_list.next, 2481 struct t10_pr_registration, pr_reg_list); 2482 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2483 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2484 dev->dev_pr_res_holder->pr_res_holder = 1; 2485 } 2486 spin_unlock(&dev->t10_pr.registration_lock); 2487 out: 2488 if (!dev->dev_pr_res_holder) { 2489 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2490 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2491 tfo->fabric_name, (explicit) ? "explicit" : 2492 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2493 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2494 } 2495 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2496 tfo->fabric_name, se_nacl->initiatorname, 2497 i_buf); 2498 /* 2499 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2500 */ 2501 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2502 } 2503 2504 static sense_reason_t 2505 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2506 u64 res_key) 2507 { 2508 struct se_device *dev = cmd->se_dev; 2509 struct se_session *se_sess = cmd->se_sess; 2510 struct se_lun *se_lun = cmd->se_lun; 2511 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2512 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2513 sense_reason_t ret = 0; 2514 2515 if (!se_sess || !se_lun) { 2516 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2517 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2518 } 2519 /* 2520 * Locate the existing *pr_reg via struct se_node_acl pointers 2521 */ 2522 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2523 if (!pr_reg) { 2524 pr_err("SPC-3 PR: Unable to locate" 2525 " PR_REGISTERED *pr_reg for RELEASE\n"); 2526 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2527 } 2528 /* 2529 * From spc4r17 Section 5.7.11.2 Releasing: 2530 * 2531 * If there is no persistent reservation or in response to a persistent 2532 * reservation release request from a registered I_T nexus that is not a 2533 * persistent reservation holder (see 5.7.10), the device server shall 2534 * do the following: 2535 * 2536 * a) Not release the persistent reservation, if any; 2537 * b) Not remove any registrations; and 2538 * c) Complete the command with GOOD status. 2539 */ 2540 spin_lock(&dev->dev_reservation_lock); 2541 pr_res_holder = dev->dev_pr_res_holder; 2542 if (!pr_res_holder) { 2543 /* 2544 * No persistent reservation, return GOOD status. 2545 */ 2546 spin_unlock(&dev->dev_reservation_lock); 2547 goto out_put_pr_reg; 2548 } 2549 2550 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2551 /* 2552 * Release request from a registered I_T nexus that is not a 2553 * persistent reservation holder. return GOOD status. 2554 */ 2555 spin_unlock(&dev->dev_reservation_lock); 2556 goto out_put_pr_reg; 2557 } 2558 2559 /* 2560 * From spc4r17 Section 5.7.11.2 Releasing: 2561 * 2562 * Only the persistent reservation holder (see 5.7.10) is allowed to 2563 * release a persistent reservation. 2564 * 2565 * An application client releases the persistent reservation by issuing 2566 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2567 * an I_T nexus that is a persistent reservation holder with the 2568 * following parameters: 2569 * 2570 * a) RESERVATION KEY field set to the value of the reservation key 2571 * that is registered with the logical unit for the I_T nexus; 2572 */ 2573 if (res_key != pr_reg->pr_res_key) { 2574 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2575 " does not match existing SA REGISTER res_key:" 2576 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2577 spin_unlock(&dev->dev_reservation_lock); 2578 ret = TCM_RESERVATION_CONFLICT; 2579 goto out_put_pr_reg; 2580 } 2581 /* 2582 * From spc4r17 Section 5.7.11.2 Releasing and above: 2583 * 2584 * b) TYPE field and SCOPE field set to match the persistent 2585 * reservation being released. 2586 */ 2587 if ((pr_res_holder->pr_res_type != type) || 2588 (pr_res_holder->pr_res_scope != scope)) { 2589 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2590 pr_err("SPC-3 PR RELEASE: Attempted to release" 2591 " reservation from [%s]: %s with different TYPE " 2592 "and/or SCOPE while reservation already held by" 2593 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2594 cmd->se_tfo->fabric_name, 2595 se_sess->se_node_acl->initiatorname, 2596 pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name, 2597 pr_res_holder->pr_reg_nacl->initiatorname); 2598 2599 spin_unlock(&dev->dev_reservation_lock); 2600 ret = TCM_RESERVATION_CONFLICT; 2601 goto out_put_pr_reg; 2602 } 2603 /* 2604 * In response to a persistent reservation release request from the 2605 * persistent reservation holder the device server shall perform a 2606 * release by doing the following as an uninterrupted series of actions: 2607 * a) Release the persistent reservation; 2608 * b) Not remove any registration(s); 2609 * c) If the released persistent reservation is a registrants only type 2610 * or all registrants type persistent reservation, 2611 * the device server shall establish a unit attention condition for 2612 * the initiator port associated with every regis- 2613 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2614 * RESERVE OUT command with RELEASE service action was received, 2615 * with the additional sense code set to RESERVATIONS RELEASED; and 2616 * d) If the persistent reservation is of any other type, the device 2617 * server shall not establish a unit attention condition. 2618 */ 2619 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2620 pr_reg, 1, 0); 2621 2622 spin_unlock(&dev->dev_reservation_lock); 2623 2624 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2625 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2626 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2627 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2628 /* 2629 * If no UNIT ATTENTION conditions will be established for 2630 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2631 * go ahead and check for APTPL=1 update+write below 2632 */ 2633 goto write_aptpl; 2634 } 2635 2636 spin_lock(&pr_tmpl->registration_lock); 2637 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2638 pr_reg_list) { 2639 /* 2640 * Do not establish a UNIT ATTENTION condition 2641 * for the calling I_T Nexus 2642 */ 2643 if (pr_reg_p == pr_reg) 2644 continue; 2645 2646 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2647 pr_reg_p->pr_res_mapped_lun, 2648 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2649 } 2650 spin_unlock(&pr_tmpl->registration_lock); 2651 2652 write_aptpl: 2653 if (pr_tmpl->pr_aptpl_active) 2654 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2655 2656 out_put_pr_reg: 2657 core_scsi3_put_pr_reg(pr_reg); 2658 return ret; 2659 } 2660 2661 static sense_reason_t 2662 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2663 { 2664 struct se_device *dev = cmd->se_dev; 2665 struct se_node_acl *pr_reg_nacl; 2666 struct se_session *se_sess = cmd->se_sess; 2667 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2668 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2669 u64 pr_res_mapped_lun = 0; 2670 int calling_it_nexus = 0; 2671 /* 2672 * Locate the existing *pr_reg via struct se_node_acl pointers 2673 */ 2674 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2675 se_sess->se_node_acl, se_sess); 2676 if (!pr_reg_n) { 2677 pr_err("SPC-3 PR: Unable to locate" 2678 " PR_REGISTERED *pr_reg for CLEAR\n"); 2679 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2680 } 2681 /* 2682 * From spc4r17 section 5.7.11.6, Clearing: 2683 * 2684 * Any application client may release the persistent reservation and 2685 * remove all registrations from a device server by issuing a 2686 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2687 * registered I_T nexus with the following parameter: 2688 * 2689 * a) RESERVATION KEY field set to the value of the reservation key 2690 * that is registered with the logical unit for the I_T nexus. 2691 */ 2692 if (res_key != pr_reg_n->pr_res_key) { 2693 pr_err("SPC-3 PR REGISTER: Received" 2694 " res_key: 0x%016Lx does not match" 2695 " existing SA REGISTER res_key:" 2696 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2697 core_scsi3_put_pr_reg(pr_reg_n); 2698 return TCM_RESERVATION_CONFLICT; 2699 } 2700 /* 2701 * a) Release the persistent reservation, if any; 2702 */ 2703 spin_lock(&dev->dev_reservation_lock); 2704 pr_res_holder = dev->dev_pr_res_holder; 2705 if (pr_res_holder) { 2706 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2707 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2708 pr_res_holder, 0, 0); 2709 } 2710 spin_unlock(&dev->dev_reservation_lock); 2711 /* 2712 * b) Remove all registration(s) (see spc4r17 5.7.7); 2713 */ 2714 spin_lock(&pr_tmpl->registration_lock); 2715 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2716 &pr_tmpl->registration_list, pr_reg_list) { 2717 2718 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2719 pr_reg_nacl = pr_reg->pr_reg_nacl; 2720 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2721 __core_scsi3_free_registration(dev, pr_reg, NULL, 2722 calling_it_nexus); 2723 /* 2724 * e) Establish a unit attention condition for the initiator 2725 * port associated with every registered I_T nexus other 2726 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2727 * command with CLEAR service action was received, with the 2728 * additional sense code set to RESERVATIONS PREEMPTED. 2729 */ 2730 if (!calling_it_nexus) 2731 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2732 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2733 } 2734 spin_unlock(&pr_tmpl->registration_lock); 2735 2736 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2737 cmd->se_tfo->fabric_name); 2738 2739 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2740 2741 core_scsi3_pr_generation(dev); 2742 return 0; 2743 } 2744 2745 static void __core_scsi3_complete_pro_preempt( 2746 struct se_device *dev, 2747 struct t10_pr_registration *pr_reg, 2748 struct list_head *preempt_and_abort_list, 2749 int type, 2750 int scope, 2751 enum preempt_type preempt_type) 2752 { 2753 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2754 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2755 char i_buf[PR_REG_ISID_ID_LEN] = { }; 2756 2757 lockdep_assert_held(&dev->dev_reservation_lock); 2758 2759 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2760 /* 2761 * Do an implicit RELEASE of the existing reservation. 2762 */ 2763 if (dev->dev_pr_res_holder) 2764 __core_scsi3_complete_pro_release(dev, nacl, 2765 dev->dev_pr_res_holder, 0, 0); 2766 2767 dev->dev_pr_res_holder = pr_reg; 2768 pr_reg->pr_res_holder = 1; 2769 pr_reg->pr_res_type = type; 2770 pr_reg->pr_res_scope = scope; 2771 2772 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2773 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2774 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2775 core_scsi3_pr_dump_type(type), 2776 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2777 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2778 tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2779 nacl->initiatorname, i_buf); 2780 /* 2781 * For PREEMPT_AND_ABORT, add the preempting reservation's 2782 * struct t10_pr_registration to the list that will be compared 2783 * against received CDBs.. 2784 */ 2785 if (preempt_and_abort_list) 2786 list_add_tail(&pr_reg->pr_reg_abort_list, 2787 preempt_and_abort_list); 2788 } 2789 2790 static void core_scsi3_release_preempt_and_abort( 2791 struct list_head *preempt_and_abort_list, 2792 struct t10_pr_registration *pr_reg_holder) 2793 { 2794 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2795 2796 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2797 pr_reg_abort_list) { 2798 2799 list_del(&pr_reg->pr_reg_abort_list); 2800 if (pr_reg_holder == pr_reg) 2801 continue; 2802 if (pr_reg->pr_res_holder) { 2803 pr_warn("pr_reg->pr_res_holder still set\n"); 2804 continue; 2805 } 2806 2807 pr_reg->pr_reg_deve = NULL; 2808 pr_reg->pr_reg_nacl = NULL; 2809 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2810 } 2811 } 2812 2813 static sense_reason_t 2814 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2815 u64 sa_res_key, enum preempt_type preempt_type) 2816 { 2817 struct se_device *dev = cmd->se_dev; 2818 struct se_node_acl *pr_reg_nacl; 2819 struct se_session *se_sess = cmd->se_sess; 2820 LIST_HEAD(preempt_and_abort_list); 2821 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2822 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2823 u64 pr_res_mapped_lun = 0; 2824 int all_reg = 0, calling_it_nexus = 0; 2825 bool sa_res_key_unmatched = sa_res_key != 0; 2826 int prh_type = 0, prh_scope = 0; 2827 2828 if (!se_sess) 2829 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2830 2831 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2832 se_sess); 2833 if (!pr_reg_n) { 2834 pr_err("SPC-3 PR: Unable to locate" 2835 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2836 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2837 return TCM_RESERVATION_CONFLICT; 2838 } 2839 if (pr_reg_n->pr_res_key != res_key) { 2840 core_scsi3_put_pr_reg(pr_reg_n); 2841 return TCM_RESERVATION_CONFLICT; 2842 } 2843 2844 spin_lock(&dev->dev_reservation_lock); 2845 pr_res_holder = dev->dev_pr_res_holder; 2846 if (pr_res_holder && 2847 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2848 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2849 all_reg = 1; 2850 2851 if (!all_reg && !sa_res_key) { 2852 spin_unlock(&dev->dev_reservation_lock); 2853 core_scsi3_put_pr_reg(pr_reg_n); 2854 return TCM_INVALID_PARAMETER_LIST; 2855 } 2856 2857 /* Validate TYPE and SCOPE fields if they will be used */ 2858 if (pr_res_holder && 2859 (pr_res_holder->pr_res_key == sa_res_key || 2860 (all_reg && !sa_res_key))) { 2861 switch (type) { 2862 case PR_TYPE_WRITE_EXCLUSIVE: 2863 case PR_TYPE_EXCLUSIVE_ACCESS: 2864 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2865 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2866 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2867 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2868 break; 2869 default: 2870 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 2871 " Type: 0x%02x\n", 2872 (preempt_type == PREEMPT_AND_ABORT) ? 2873 "_AND_ABORT" : "", type); 2874 spin_unlock(&dev->dev_reservation_lock); 2875 core_scsi3_put_pr_reg(pr_reg_n); 2876 return TCM_INVALID_CDB_FIELD; 2877 } 2878 2879 if (scope != PR_SCOPE_LU_SCOPE) { 2880 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2881 spin_unlock(&dev->dev_reservation_lock); 2882 core_scsi3_put_pr_reg(pr_reg_n); 2883 return TCM_INVALID_PARAMETER_LIST; 2884 } 2885 } 2886 2887 /* 2888 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2889 * 2890 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2891 * persistent reservation holder or there is no persistent reservation 2892 * holder (i.e., there is no persistent reservation), then the device 2893 * server shall perform a preempt by doing the following in an 2894 * uninterrupted series of actions. (See below..) 2895 */ 2896 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2897 /* 2898 * No existing or SA Reservation Key matching reservations.. 2899 * 2900 * PROUT SA PREEMPT with All Registrant type reservations are 2901 * allowed to be processed without a matching SA Reservation Key 2902 */ 2903 spin_lock(&pr_tmpl->registration_lock); 2904 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2905 &pr_tmpl->registration_list, pr_reg_list) { 2906 /* 2907 * Removing of registrations in non all registrants 2908 * type reservations without a matching SA reservation 2909 * key. 2910 * 2911 * a) Remove the registrations for all I_T nexuses 2912 * specified by the SERVICE ACTION RESERVATION KEY 2913 * field; 2914 * b) Ignore the contents of the SCOPE and TYPE fields; 2915 * c) Process tasks as defined in 5.7.1; and 2916 * d) Establish a unit attention condition for the 2917 * initiator port associated with every I_T nexus 2918 * that lost its registration other than the I_T 2919 * nexus on which the PERSISTENT RESERVE OUT command 2920 * was received, with the additional sense code set 2921 * to REGISTRATIONS PREEMPTED. 2922 */ 2923 if (!all_reg) { 2924 if (pr_reg->pr_res_key != sa_res_key) 2925 continue; 2926 sa_res_key_unmatched = false; 2927 2928 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2929 pr_reg_nacl = pr_reg->pr_reg_nacl; 2930 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2931 __core_scsi3_free_registration(dev, pr_reg, 2932 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2933 NULL, calling_it_nexus); 2934 } else { 2935 /* 2936 * Case for any existing all registrants type 2937 * reservation, follow logic in spc4r17 section 2938 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2939 * 2940 * For a ZERO SA Reservation key, release 2941 * all other registrations and do an implicit 2942 * release of active persistent reservation. 2943 * 2944 * For a non-ZERO SA Reservation key, only 2945 * release the matching reservation key from 2946 * registrations. 2947 */ 2948 if ((sa_res_key) && 2949 (pr_reg->pr_res_key != sa_res_key)) 2950 continue; 2951 sa_res_key_unmatched = false; 2952 2953 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2954 if (calling_it_nexus) 2955 continue; 2956 2957 pr_reg_nacl = pr_reg->pr_reg_nacl; 2958 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2959 __core_scsi3_free_registration(dev, pr_reg, 2960 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2961 NULL, 0); 2962 } 2963 if (!calling_it_nexus) 2964 target_ua_allocate_lun(pr_reg_nacl, 2965 pr_res_mapped_lun, 0x2A, 2966 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2967 } 2968 spin_unlock(&pr_tmpl->registration_lock); 2969 /* 2970 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2971 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2972 * RESERVATION KEY field to a value that does not match any 2973 * registered reservation key, then the device server shall 2974 * complete the command with RESERVATION CONFLICT status. 2975 */ 2976 if (sa_res_key_unmatched) { 2977 spin_unlock(&dev->dev_reservation_lock); 2978 core_scsi3_put_pr_reg(pr_reg_n); 2979 return TCM_RESERVATION_CONFLICT; 2980 } 2981 /* 2982 * For an existing all registrants type reservation 2983 * with a zero SA rservation key, preempt the existing 2984 * reservation with the new PR type and scope. 2985 */ 2986 if (pr_res_holder && all_reg && !(sa_res_key)) { 2987 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2988 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2989 type, scope, preempt_type); 2990 } 2991 2992 spin_unlock(&dev->dev_reservation_lock); 2993 2994 /* 2995 * SPC-4 5.12.11.2.6 Preempting and aborting 2996 * The actions described in this subclause shall be performed 2997 * for all I_T nexuses that are registered with the non-zero 2998 * SERVICE ACTION RESERVATION KEY value, without regard for 2999 * whether the preempted I_T nexuses hold the persistent 3000 * reservation. If the SERVICE ACTION RESERVATION KEY field is 3001 * set to zero and an all registrants persistent reservation is 3002 * present, the device server shall abort all commands for all 3003 * registered I_T nexuses. 3004 */ 3005 if (preempt_type == PREEMPT_AND_ABORT) { 3006 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, 3007 cmd); 3008 core_scsi3_release_preempt_and_abort( 3009 &preempt_and_abort_list, pr_reg_n); 3010 } 3011 3012 if (pr_tmpl->pr_aptpl_active) 3013 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3014 3015 core_scsi3_put_pr_reg(pr_reg_n); 3016 core_scsi3_pr_generation(cmd->se_dev); 3017 return 0; 3018 } 3019 /* 3020 * The PREEMPTing SA reservation key matches that of the 3021 * existing persistent reservation, first, we check if 3022 * we are preempting our own reservation. 3023 * From spc4r17, section 5.7.11.4.3 Preempting 3024 * persistent reservations and registration handling 3025 * 3026 * If an all registrants persistent reservation is not 3027 * present, it is not an error for the persistent 3028 * reservation holder to preempt itself (i.e., a 3029 * PERSISTENT RESERVE OUT with a PREEMPT service action 3030 * or a PREEMPT AND ABORT service action with the 3031 * SERVICE ACTION RESERVATION KEY value equal to the 3032 * persistent reservation holder's reservation key that 3033 * is received from the persistent reservation holder). 3034 * In that case, the device server shall establish the 3035 * new persistent reservation and maintain the 3036 * registration. 3037 */ 3038 prh_type = pr_res_holder->pr_res_type; 3039 prh_scope = pr_res_holder->pr_res_scope; 3040 /* 3041 * If the SERVICE ACTION RESERVATION KEY field identifies a 3042 * persistent reservation holder (see 5.7.10), the device 3043 * server shall perform a preempt by doing the following as 3044 * an uninterrupted series of actions: 3045 * 3046 * a) Release the persistent reservation for the holder 3047 * identified by the SERVICE ACTION RESERVATION KEY field; 3048 */ 3049 if (pr_reg_n != pr_res_holder) 3050 __core_scsi3_complete_pro_release(dev, 3051 pr_res_holder->pr_reg_nacl, 3052 dev->dev_pr_res_holder, 0, 0); 3053 /* 3054 * b) Remove the registrations for all I_T nexuses identified 3055 * by the SERVICE ACTION RESERVATION KEY field, except the 3056 * I_T nexus that is being used for the PERSISTENT RESERVE 3057 * OUT command. If an all registrants persistent reservation 3058 * is present and the SERVICE ACTION RESERVATION KEY field 3059 * is set to zero, then all registrations shall be removed 3060 * except for that of the I_T nexus that is being used for 3061 * the PERSISTENT RESERVE OUT command; 3062 */ 3063 spin_lock(&pr_tmpl->registration_lock); 3064 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3065 &pr_tmpl->registration_list, pr_reg_list) { 3066 3067 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3068 if (calling_it_nexus) 3069 continue; 3070 3071 if (sa_res_key && pr_reg->pr_res_key != sa_res_key) 3072 continue; 3073 3074 pr_reg_nacl = pr_reg->pr_reg_nacl; 3075 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3076 __core_scsi3_free_registration(dev, pr_reg, 3077 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3078 calling_it_nexus); 3079 /* 3080 * e) Establish a unit attention condition for the initiator 3081 * port associated with every I_T nexus that lost its 3082 * persistent reservation and/or registration, with the 3083 * additional sense code set to REGISTRATIONS PREEMPTED; 3084 */ 3085 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3086 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3087 } 3088 spin_unlock(&pr_tmpl->registration_lock); 3089 /* 3090 * c) Establish a persistent reservation for the preempting 3091 * I_T nexus using the contents of the SCOPE and TYPE fields; 3092 */ 3093 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3094 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3095 type, scope, preempt_type); 3096 /* 3097 * d) Process tasks as defined in 5.7.1; 3098 * e) See above.. 3099 * f) If the type or scope has changed, then for every I_T nexus 3100 * whose reservation key was not removed, except for the I_T 3101 * nexus on which the PERSISTENT RESERVE OUT command was 3102 * received, the device server shall establish a unit 3103 * attention condition for the initiator port associated with 3104 * that I_T nexus, with the additional sense code set to 3105 * RESERVATIONS RELEASED. If the type or scope have not 3106 * changed, then no unit attention condition(s) shall be 3107 * established for this reason. 3108 */ 3109 if ((prh_type != type) || (prh_scope != scope)) { 3110 spin_lock(&pr_tmpl->registration_lock); 3111 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3112 &pr_tmpl->registration_list, pr_reg_list) { 3113 3114 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3115 if (calling_it_nexus) 3116 continue; 3117 3118 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3119 pr_reg->pr_res_mapped_lun, 0x2A, 3120 ASCQ_2AH_RESERVATIONS_RELEASED); 3121 } 3122 spin_unlock(&pr_tmpl->registration_lock); 3123 } 3124 spin_unlock(&dev->dev_reservation_lock); 3125 /* 3126 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3127 * All received CDBs for the matching existing reservation and 3128 * registrations undergo ABORT_TASK logic. 3129 * 3130 * From there, core_scsi3_release_preempt_and_abort() will 3131 * release every registration in the list (which have already 3132 * been removed from the primary pr_reg list), except the 3133 * new persistent reservation holder, the calling Initiator Port. 3134 */ 3135 if (preempt_type == PREEMPT_AND_ABORT) { 3136 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3137 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3138 pr_reg_n); 3139 } 3140 3141 if (pr_tmpl->pr_aptpl_active) 3142 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3143 3144 core_scsi3_put_pr_reg(pr_reg_n); 3145 core_scsi3_pr_generation(cmd->se_dev); 3146 return 0; 3147 } 3148 3149 static sense_reason_t 3150 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3151 u64 sa_res_key, int aptpl, int unreg) 3152 { 3153 struct se_session *se_sess = cmd->se_sess; 3154 struct se_device *dev = cmd->se_dev; 3155 struct se_dev_entry *dest_se_deve = NULL; 3156 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3157 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3158 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3159 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3160 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3161 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3162 unsigned char *buf; 3163 unsigned char initiator_str[TRANSPORT_IQN_LEN]; 3164 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { }; 3165 u32 tid_len, tmp_tid_len; 3166 int new_reg = 0, type, scope, matching_iname; 3167 sense_reason_t ret; 3168 unsigned short rtpi; 3169 unsigned char proto_ident; 3170 bool tid_found; 3171 3172 if (!se_sess || !se_lun) { 3173 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3174 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3175 } 3176 3177 se_tpg = se_sess->se_tpg; 3178 tf_ops = se_tpg->se_tpg_tfo; 3179 /* 3180 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3181 * Register behaviors for a REGISTER AND MOVE service action 3182 * 3183 * Locate the existing *pr_reg via struct se_node_acl pointers 3184 */ 3185 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3186 se_sess); 3187 if (!pr_reg) { 3188 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3189 " *pr_reg for REGISTER_AND_MOVE\n"); 3190 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3191 } 3192 /* 3193 * The provided reservation key much match the existing reservation key 3194 * provided during this initiator's I_T nexus registration. 3195 */ 3196 if (res_key != pr_reg->pr_res_key) { 3197 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3198 " res_key: 0x%016Lx does not match existing SA REGISTER" 3199 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3200 ret = TCM_RESERVATION_CONFLICT; 3201 goto out_put_pr_reg; 3202 } 3203 /* 3204 * The service active reservation key needs to be non zero 3205 */ 3206 if (!sa_res_key) { 3207 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3208 " sa_res_key\n"); 3209 ret = TCM_INVALID_PARAMETER_LIST; 3210 goto out_put_pr_reg; 3211 } 3212 3213 /* 3214 * Determine the Relative Target Port Identifier where the reservation 3215 * will be moved to for the TransportID containing SCSI initiator WWN 3216 * information. 3217 */ 3218 buf = transport_kmap_data_sg(cmd); 3219 if (!buf) { 3220 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3221 goto out_put_pr_reg; 3222 } 3223 3224 rtpi = get_unaligned_be16(&buf[18]); 3225 tid_len = get_unaligned_be32(&buf[20]); 3226 transport_kunmap_data_sg(cmd); 3227 buf = NULL; 3228 3229 if ((tid_len + 24) != cmd->data_length) { 3230 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3231 " does not equal CDB data_length: %u\n", tid_len, 3232 cmd->data_length); 3233 ret = TCM_INVALID_PARAMETER_LIST; 3234 goto out_put_pr_reg; 3235 } 3236 3237 spin_lock(&dev->se_port_lock); 3238 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3239 if (tmp_lun->lun_tpg->tpg_rtpi != rtpi) 3240 continue; 3241 dest_se_tpg = tmp_lun->lun_tpg; 3242 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3243 if (!dest_tf_ops) 3244 continue; 3245 3246 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3247 spin_unlock(&dev->se_port_lock); 3248 3249 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3250 pr_err("core_scsi3_tpg_depend_item() failed" 3251 " for dest_se_tpg\n"); 3252 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3253 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3254 goto out_put_pr_reg; 3255 } 3256 3257 spin_lock(&dev->se_port_lock); 3258 break; 3259 } 3260 spin_unlock(&dev->se_port_lock); 3261 3262 if (!dest_se_tpg || !dest_tf_ops) { 3263 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3264 " fabric ops from Relative Target Port Identifier:" 3265 " %hu\n", rtpi); 3266 ret = TCM_INVALID_PARAMETER_LIST; 3267 goto out_put_pr_reg; 3268 } 3269 3270 buf = transport_kmap_data_sg(cmd); 3271 if (!buf) { 3272 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3273 goto out_put_pr_reg; 3274 } 3275 proto_ident = (buf[24] & 0x0f); 3276 3277 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3278 " 0x%02x\n", proto_ident); 3279 3280 if (proto_ident != dest_se_tpg->proto_id) { 3281 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3282 " proto_ident: 0x%02x does not match ident: 0x%02x" 3283 " from fabric: %s\n", proto_ident, 3284 dest_se_tpg->proto_id, 3285 dest_tf_ops->fabric_name); 3286 ret = TCM_INVALID_PARAMETER_LIST; 3287 goto out; 3288 } 3289 tid_found = target_parse_pr_out_transport_id(dest_se_tpg, 3290 &buf[24], tid_len, &tmp_tid_len, &iport_ptr, initiator_str); 3291 if (!tid_found) { 3292 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3293 " initiator_str from Transport ID\n"); 3294 ret = TCM_INVALID_PARAMETER_LIST; 3295 goto out; 3296 } 3297 3298 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3299 " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ? 3300 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3301 iport_ptr : ""); 3302 /* 3303 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3304 * action specifies a TransportID that is the same as the initiator port 3305 * of the I_T nexus for the command received, then the command shall 3306 * be terminated with CHECK CONDITION status, with the sense key set to 3307 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3308 * IN PARAMETER LIST. 3309 */ 3310 pr_reg_nacl = pr_reg->pr_reg_nacl; 3311 matching_iname = (!strcmp(initiator_str, 3312 pr_reg_nacl->initiatorname)) ? 1 : 0; 3313 if (!matching_iname) 3314 goto after_iport_check; 3315 3316 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3317 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3318 " matches: %s on received I_T Nexus\n", initiator_str, 3319 pr_reg_nacl->initiatorname); 3320 ret = TCM_INVALID_PARAMETER_LIST; 3321 goto out; 3322 } 3323 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3324 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3325 " matches: %s %s on received I_T Nexus\n", 3326 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3327 pr_reg->pr_reg_isid); 3328 ret = TCM_INVALID_PARAMETER_LIST; 3329 goto out; 3330 } 3331 after_iport_check: 3332 /* 3333 * Locate the destination struct se_node_acl from the received Transport ID 3334 */ 3335 mutex_lock(&dest_se_tpg->acl_node_mutex); 3336 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3337 initiator_str); 3338 if (dest_node_acl) 3339 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3340 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3341 3342 if (!dest_node_acl) { 3343 pr_err("Unable to locate %s dest_node_acl for" 3344 " TransportID%s\n", dest_tf_ops->fabric_name, 3345 initiator_str); 3346 ret = TCM_INVALID_PARAMETER_LIST; 3347 goto out; 3348 } 3349 3350 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3351 pr_err("core_scsi3_nodeacl_depend_item() for" 3352 " dest_node_acl\n"); 3353 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3354 dest_node_acl = NULL; 3355 ret = TCM_INVALID_PARAMETER_LIST; 3356 goto out; 3357 } 3358 3359 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3360 " %s from TransportID\n", dest_tf_ops->fabric_name, 3361 dest_node_acl->initiatorname); 3362 3363 /* 3364 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3365 * PORT IDENTIFIER. 3366 */ 3367 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3368 if (!dest_se_deve) { 3369 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3370 " %hu\n", dest_tf_ops->fabric_name, rtpi); 3371 ret = TCM_INVALID_PARAMETER_LIST; 3372 goto out; 3373 } 3374 3375 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3376 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3377 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3378 dest_se_deve = NULL; 3379 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3380 goto out; 3381 } 3382 3383 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3384 " ACL for dest_se_deve->mapped_lun: %llu\n", 3385 dest_tf_ops->fabric_name, dest_node_acl->initiatorname, 3386 dest_se_deve->mapped_lun); 3387 3388 /* 3389 * A persistent reservation needs to already existing in order to 3390 * successfully complete the REGISTER_AND_MOVE service action.. 3391 */ 3392 spin_lock(&dev->dev_reservation_lock); 3393 pr_res_holder = dev->dev_pr_res_holder; 3394 if (!pr_res_holder) { 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3396 " currently held\n"); 3397 spin_unlock(&dev->dev_reservation_lock); 3398 ret = TCM_INVALID_CDB_FIELD; 3399 goto out; 3400 } 3401 /* 3402 * The received on I_T Nexus must be the reservation holder. 3403 * 3404 * From spc4r17 section 5.7.8 Table 50 -- 3405 * Register behaviors for a REGISTER AND MOVE service action 3406 */ 3407 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3408 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3409 " Nexus is not reservation holder\n"); 3410 spin_unlock(&dev->dev_reservation_lock); 3411 ret = TCM_RESERVATION_CONFLICT; 3412 goto out; 3413 } 3414 /* 3415 * From spc4r17 section 5.7.8: registering and moving reservation 3416 * 3417 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3418 * action is received and the established persistent reservation is a 3419 * Write Exclusive - All Registrants type or Exclusive Access - 3420 * All Registrants type reservation, then the command shall be completed 3421 * with RESERVATION CONFLICT status. 3422 */ 3423 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3424 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3425 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3426 " reservation for type: %s\n", 3427 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3428 spin_unlock(&dev->dev_reservation_lock); 3429 ret = TCM_RESERVATION_CONFLICT; 3430 goto out; 3431 } 3432 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3433 /* 3434 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3435 */ 3436 type = pr_res_holder->pr_res_type; 3437 scope = pr_res_holder->pr_res_type; 3438 /* 3439 * c) Associate the reservation key specified in the SERVICE ACTION 3440 * RESERVATION KEY field with the I_T nexus specified as the 3441 * destination of the register and move, where: 3442 * A) The I_T nexus is specified by the TransportID and the 3443 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3444 * B) Regardless of the TransportID format used, the association for 3445 * the initiator port is based on either the initiator port name 3446 * (see 3.1.71) on SCSI transport protocols where port names are 3447 * required or the initiator port identifier (see 3.1.70) on SCSI 3448 * transport protocols where port names are not required; 3449 * d) Register the reservation key specified in the SERVICE ACTION 3450 * RESERVATION KEY field; 3451 * 3452 * Also, It is not an error for a REGISTER AND MOVE service action to 3453 * register an I_T nexus that is already registered with the same 3454 * reservation key or a different reservation key. 3455 */ 3456 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3457 iport_ptr); 3458 if (!dest_pr_reg) { 3459 struct se_lun *dest_lun = dest_se_deve->se_lun; 3460 3461 spin_unlock(&dev->dev_reservation_lock); 3462 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3463 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3464 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3465 ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES; 3466 goto out; 3467 } 3468 spin_lock(&dev->dev_reservation_lock); 3469 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3470 iport_ptr); 3471 new_reg = 1; 3472 } else { 3473 /* 3474 * e) Retain the reservation key specified in the SERVICE ACTION 3475 * RESERVATION KEY field and associated information; 3476 */ 3477 dest_pr_reg->pr_res_key = sa_res_key; 3478 } 3479 /* 3480 * f) Release the persistent reservation for the persistent reservation 3481 * holder (i.e., the I_T nexus on which the 3482 */ 3483 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3484 dev->dev_pr_res_holder, 0, 0); 3485 /* 3486 * g) Move the persistent reservation to the specified I_T nexus using 3487 * the same scope and type as the persistent reservation released in 3488 * item f); and 3489 */ 3490 dev->dev_pr_res_holder = dest_pr_reg; 3491 dest_pr_reg->pr_res_holder = 1; 3492 dest_pr_reg->pr_res_type = type; 3493 pr_reg->pr_res_scope = scope; 3494 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3495 /* 3496 * Increment PRGeneration for existing registrations.. 3497 */ 3498 if (!new_reg) 3499 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3500 spin_unlock(&dev->dev_reservation_lock); 3501 3502 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3503 " created new reservation holder TYPE: %s on object RTPI:" 3504 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name, 3505 core_scsi3_pr_dump_type(type), rtpi, 3506 dest_pr_reg->pr_res_generation); 3507 pr_debug("SPC-3 PR Successfully moved reservation from" 3508 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3509 tf_ops->fabric_name, pr_reg_nacl->initiatorname, 3510 i_buf, dest_tf_ops->fabric_name, 3511 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3512 iport_ptr : ""); 3513 /* 3514 * It is now safe to release configfs group dependencies for destination 3515 * of Transport ID Initiator Device/Port Identifier 3516 */ 3517 core_scsi3_lunacl_undepend_item(dest_se_deve); 3518 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3519 core_scsi3_tpg_undepend_item(dest_se_tpg); 3520 /* 3521 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3522 * nexus on which PERSISTENT RESERVE OUT command was received. 3523 */ 3524 if (unreg) { 3525 spin_lock(&pr_tmpl->registration_lock); 3526 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3527 spin_unlock(&pr_tmpl->registration_lock); 3528 } else 3529 core_scsi3_put_pr_reg(pr_reg); 3530 3531 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3532 3533 core_scsi3_put_pr_reg(dest_pr_reg); 3534 /* 3535 * iport_ptr aliases the PR-OUT parameter list mapped above, so the 3536 * buffer is unmapped only here on success (and at out: on error). 3537 */ 3538 transport_kunmap_data_sg(cmd); 3539 return 0; 3540 out: 3541 if (buf) 3542 transport_kunmap_data_sg(cmd); 3543 if (dest_se_deve) 3544 core_scsi3_lunacl_undepend_item(dest_se_deve); 3545 if (dest_node_acl) 3546 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3547 core_scsi3_tpg_undepend_item(dest_se_tpg); 3548 3549 out_put_pr_reg: 3550 core_scsi3_put_pr_reg(pr_reg); 3551 return ret; 3552 } 3553 3554 static sense_reason_t 3555 target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key, 3556 u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt) 3557 { 3558 struct exec_cmd_ops *ops = cmd->protocol_data; 3559 3560 if (!cmd->se_sess || !cmd->se_lun) { 3561 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3562 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3563 } 3564 3565 if (!ops->execute_pr_out) { 3566 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 3567 return TCM_UNSUPPORTED_SCSI_OPCODE; 3568 } 3569 3570 switch (sa) { 3571 case PRO_REGISTER_AND_MOVE: 3572 case PRO_REPLACE_LOST_RESERVATION: 3573 pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n"); 3574 return TCM_UNSUPPORTED_SCSI_OPCODE; 3575 } 3576 3577 if (spec_i_pt || all_tg_pt) { 3578 pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n"); 3579 return TCM_UNSUPPORTED_SCSI_OPCODE; 3580 } 3581 3582 return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl); 3583 } 3584 3585 /* 3586 * See spc4r17 section 6.14 Table 170 3587 */ 3588 sense_reason_t 3589 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3590 { 3591 struct se_device *dev = cmd->se_dev; 3592 unsigned char *cdb = &cmd->t_task_cdb[0]; 3593 unsigned char *buf; 3594 u64 res_key, sa_res_key; 3595 int sa, scope, type, aptpl; 3596 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3597 sense_reason_t ret; 3598 3599 /* 3600 * Following spc2r20 5.5.1 Reservations overview: 3601 * 3602 * If a logical unit has been reserved by any RESERVE command and is 3603 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3604 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3605 * initiator or service action and shall terminate with a RESERVATION 3606 * CONFLICT status. 3607 */ 3608 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3609 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3610 " SPC-2 reservation is held, returning" 3611 " RESERVATION_CONFLICT\n"); 3612 return TCM_RESERVATION_CONFLICT; 3613 } 3614 3615 /* 3616 * FIXME: A NULL struct se_session pointer means an this is not coming from 3617 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3618 */ 3619 if (!cmd->se_sess) 3620 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3621 3622 if (cmd->data_length < 24) { 3623 pr_warn("SPC-PR: Received PR OUT parameter list" 3624 " length too small: %u\n", cmd->data_length); 3625 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3626 } 3627 3628 /* 3629 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3630 */ 3631 sa = (cdb[1] & 0x1f); 3632 scope = (cdb[2] & 0xf0); 3633 type = (cdb[2] & 0x0f); 3634 3635 buf = transport_kmap_data_sg(cmd); 3636 if (!buf) 3637 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3638 3639 /* 3640 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3641 */ 3642 res_key = get_unaligned_be64(&buf[0]); 3643 sa_res_key = get_unaligned_be64(&buf[8]); 3644 /* 3645 * REGISTER_AND_MOVE uses a different SA parameter list containing 3646 * SCSI TransportIDs. 3647 */ 3648 if (sa != PRO_REGISTER_AND_MOVE) { 3649 spec_i_pt = (buf[20] & 0x08); 3650 all_tg_pt = (buf[20] & 0x04); 3651 aptpl = (buf[20] & 0x01); 3652 } else { 3653 aptpl = (buf[17] & 0x01); 3654 unreg = (buf[17] & 0x02); 3655 } 3656 /* 3657 * If the backend device has been configured to force APTPL metadata 3658 * write-out, go ahead and propigate aptpl=1 down now. 3659 */ 3660 if (dev->dev_attrib.force_pr_aptpl) 3661 aptpl = 1; 3662 3663 transport_kunmap_data_sg(cmd); 3664 buf = NULL; 3665 3666 /* 3667 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3668 */ 3669 if (spec_i_pt && (sa != PRO_REGISTER)) 3670 return TCM_INVALID_PARAMETER_LIST; 3671 3672 /* 3673 * From spc4r17 section 6.14: 3674 * 3675 * If the SPEC_I_PT bit is set to zero, the service action is not 3676 * REGISTER AND MOVE, and the parameter list length is not 24, then 3677 * the command shall be terminated with CHECK CONDITION status, with 3678 * the sense key set to ILLEGAL REQUEST, and the additional sense 3679 * code set to PARAMETER LIST LENGTH ERROR. 3680 */ 3681 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3682 (cmd->data_length != 24)) { 3683 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3684 " list length: %u\n", cmd->data_length); 3685 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3686 } 3687 3688 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 3689 ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type, 3690 aptpl, all_tg_pt, spec_i_pt); 3691 goto done; 3692 } 3693 3694 /* 3695 * (core_scsi3_emulate_pro_* function parameters 3696 * are defined by spc4r17 Table 174: 3697 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3698 */ 3699 switch (sa) { 3700 case PRO_REGISTER: 3701 ret = core_scsi3_emulate_pro_register(cmd, 3702 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3703 break; 3704 case PRO_RESERVE: 3705 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3706 break; 3707 case PRO_RELEASE: 3708 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3709 break; 3710 case PRO_CLEAR: 3711 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3712 break; 3713 case PRO_PREEMPT: 3714 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3715 res_key, sa_res_key, PREEMPT); 3716 break; 3717 case PRO_PREEMPT_AND_ABORT: 3718 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3719 res_key, sa_res_key, PREEMPT_AND_ABORT); 3720 break; 3721 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3722 ret = core_scsi3_emulate_pro_register(cmd, 3723 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3724 break; 3725 case PRO_REGISTER_AND_MOVE: 3726 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3727 sa_res_key, aptpl, unreg); 3728 break; 3729 default: 3730 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3731 " action: 0x%02x\n", sa); 3732 return TCM_INVALID_CDB_FIELD; 3733 } 3734 3735 done: 3736 if (!ret) 3737 target_complete_cmd(cmd, SAM_STAT_GOOD); 3738 return ret; 3739 } 3740 3741 /* 3742 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3743 * 3744 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3745 */ 3746 static sense_reason_t 3747 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3748 { 3749 struct se_device *dev = cmd->se_dev; 3750 struct t10_pr_registration *pr_reg; 3751 unsigned char *buf; 3752 u32 add_len = 0, off = 8; 3753 3754 if (cmd->data_length < 8) { 3755 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3756 " too small\n", cmd->data_length); 3757 return TCM_INVALID_CDB_FIELD; 3758 } 3759 3760 buf = transport_kmap_data_sg(cmd); 3761 if (!buf) 3762 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3763 3764 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3765 3766 spin_lock(&dev->t10_pr.registration_lock); 3767 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3768 pr_reg_list) { 3769 /* 3770 * Check for overflow of 8byte PRI READ_KEYS payload and 3771 * next reservation key list descriptor. 3772 */ 3773 if (off + 8 <= cmd->data_length) { 3774 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3775 off += 8; 3776 } 3777 /* 3778 * SPC5r17: 6.16.2 READ KEYS service action 3779 * The ADDITIONAL LENGTH field indicates the number of bytes in 3780 * the Reservation key list. The contents of the ADDITIONAL 3781 * LENGTH field are not altered based on the allocation length 3782 */ 3783 add_len += 8; 3784 } 3785 spin_unlock(&dev->t10_pr.registration_lock); 3786 3787 put_unaligned_be32(add_len, &buf[4]); 3788 target_set_cmd_data_length(cmd, 8 + add_len); 3789 3790 transport_kunmap_data_sg(cmd); 3791 3792 return 0; 3793 } 3794 3795 /* 3796 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3797 * 3798 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3799 */ 3800 static sense_reason_t 3801 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3802 { 3803 struct se_device *dev = cmd->se_dev; 3804 struct t10_pr_registration *pr_reg; 3805 unsigned char *buf; 3806 u64 pr_res_key; 3807 u32 add_len = 0; 3808 3809 if (cmd->data_length < 8) { 3810 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3811 " too small\n", cmd->data_length); 3812 return TCM_INVALID_CDB_FIELD; 3813 } 3814 3815 buf = transport_kmap_data_sg(cmd); 3816 if (!buf) 3817 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3818 3819 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3820 3821 spin_lock(&dev->dev_reservation_lock); 3822 pr_reg = dev->dev_pr_res_holder; 3823 if (pr_reg) { 3824 /* 3825 * Set the Additional Length to 16 when a reservation is held 3826 */ 3827 add_len = 16; 3828 put_unaligned_be32(add_len, &buf[4]); 3829 3830 if (cmd->data_length < 22) 3831 goto err; 3832 3833 /* 3834 * Set the Reservation key. 3835 * 3836 * From spc4r17, section 5.7.10: 3837 * A persistent reservation holder has its reservation key 3838 * returned in the parameter data from a PERSISTENT 3839 * RESERVE IN command with READ RESERVATION service action as 3840 * follows: 3841 * a) For a persistent reservation of the type Write Exclusive 3842 * - All Registrants or Exclusive Access All Regitrants, 3843 * the reservation key shall be set to zero; or 3844 * b) For all other persistent reservation types, the 3845 * reservation key shall be set to the registered 3846 * reservation key for the I_T nexus that holds the 3847 * persistent reservation. 3848 */ 3849 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3850 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3851 pr_res_key = 0; 3852 else 3853 pr_res_key = pr_reg->pr_res_key; 3854 3855 put_unaligned_be64(pr_res_key, &buf[8]); 3856 /* 3857 * Set the SCOPE and TYPE 3858 */ 3859 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3860 (pr_reg->pr_res_type & 0x0f); 3861 } 3862 3863 target_set_cmd_data_length(cmd, 8 + add_len); 3864 3865 err: 3866 spin_unlock(&dev->dev_reservation_lock); 3867 transport_kunmap_data_sg(cmd); 3868 3869 return 0; 3870 } 3871 3872 /* 3873 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3874 * 3875 * See spc4r17 section 6.13.4 Table 165 3876 */ 3877 static sense_reason_t 3878 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3879 { 3880 struct se_device *dev = cmd->se_dev; 3881 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3882 unsigned char *buf; 3883 u16 len = 8; /* Hardcoded to 8. */ 3884 3885 if (cmd->data_length < 6) { 3886 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3887 " %u too small\n", cmd->data_length); 3888 return TCM_INVALID_CDB_FIELD; 3889 } 3890 3891 buf = transport_kmap_data_sg(cmd); 3892 if (!buf) 3893 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3894 3895 put_unaligned_be16(len, &buf[0]); 3896 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3897 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3898 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3899 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3900 /* 3901 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3902 * set the TMV: Task Mask Valid bit. 3903 */ 3904 buf[3] |= 0x80; 3905 /* 3906 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3907 */ 3908 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3909 /* 3910 * PTPL_A: Persistence across Target Power Loss Active bit 3911 */ 3912 if (pr_tmpl->pr_aptpl_active) 3913 buf[3] |= 0x01; 3914 /* 3915 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3916 */ 3917 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3918 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3919 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3920 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3921 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3922 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3923 3924 target_set_cmd_data_length(cmd, len); 3925 3926 transport_kunmap_data_sg(cmd); 3927 3928 return 0; 3929 } 3930 3931 /* 3932 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3933 * 3934 * See spc4r17 section 6.13.5 Table 168 and 169 3935 */ 3936 static sense_reason_t 3937 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3938 { 3939 struct se_device *dev = cmd->se_dev; 3940 struct se_node_acl *se_nacl; 3941 struct se_portal_group *se_tpg; 3942 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3943 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3944 unsigned char *buf; 3945 u32 add_desc_len = 0, add_len = 0; 3946 u32 off = 8; /* off into first Full Status descriptor */ 3947 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3948 int exp_desc_len, desc_len; 3949 bool all_reg = false; 3950 3951 if (cmd->data_length < 8) { 3952 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3953 " too small\n", cmd->data_length); 3954 return TCM_INVALID_CDB_FIELD; 3955 } 3956 3957 buf = transport_kmap_data_sg(cmd); 3958 if (!buf) 3959 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3960 3961 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3962 3963 spin_lock(&dev->dev_reservation_lock); 3964 if (dev->dev_pr_res_holder) { 3965 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3966 3967 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3968 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3969 all_reg = true; 3970 pr_res_type = pr_holder->pr_res_type; 3971 pr_res_scope = pr_holder->pr_res_scope; 3972 } 3973 } 3974 spin_unlock(&dev->dev_reservation_lock); 3975 3976 spin_lock(&pr_tmpl->registration_lock); 3977 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3978 &pr_tmpl->registration_list, pr_reg_list) { 3979 3980 se_nacl = pr_reg->pr_reg_nacl; 3981 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3982 add_desc_len = 0; 3983 3984 atomic_inc_mb(&pr_reg->pr_res_holders); 3985 spin_unlock(&pr_tmpl->registration_lock); 3986 /* 3987 * Determine expected length of $FABRIC_MOD specific 3988 * TransportID full status descriptor.. 3989 */ 3990 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3991 &format_code); 3992 if (exp_desc_len < 0 || 3993 exp_desc_len + add_len > cmd->data_length) { 3994 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3995 " out of buffer: %d\n", cmd->data_length); 3996 spin_lock(&pr_tmpl->registration_lock); 3997 atomic_dec_mb(&pr_reg->pr_res_holders); 3998 break; 3999 } 4000 /* 4001 * Set RESERVATION KEY 4002 */ 4003 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 4004 off += 8; 4005 off += 4; /* Skip Over Reserved area */ 4006 4007 /* 4008 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4009 */ 4010 if (pr_reg->pr_reg_all_tg_pt) 4011 buf[off] = 0x02; 4012 /* 4013 * The struct se_lun pointer will be present for the 4014 * reservation holder for PR_HOLDER bit. 4015 * 4016 * Also, if this registration is the reservation 4017 * holder or there is an All Registrants reservation 4018 * active, fill in SCOPE and TYPE in the next byte. 4019 */ 4020 if (pr_reg->pr_res_holder) { 4021 buf[off++] |= 0x01; 4022 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4023 (pr_reg->pr_res_type & 0x0f); 4024 } else if (all_reg) { 4025 buf[off++] |= 0x01; 4026 buf[off++] = (pr_res_scope & 0xf0) | 4027 (pr_res_type & 0x0f); 4028 } else { 4029 off += 2; 4030 } 4031 4032 off += 4; /* Skip over reserved area */ 4033 /* 4034 * From spc4r17 6.3.15: 4035 * 4036 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4037 * IDENTIFIER field contains the relative port identifier (see 4038 * 3.1.120) of the target port that is part of the I_T nexus 4039 * described by this full status descriptor. If the ALL_TG_PT 4040 * bit is set to one, the contents of the RELATIVE TARGET PORT 4041 * IDENTIFIER field are not defined by this standard. 4042 */ 4043 if (!pr_reg->pr_reg_all_tg_pt) { 4044 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4045 4046 put_unaligned_be16(sep_rtpi, &buf[off]); 4047 off += 2; 4048 } else 4049 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4050 4051 buf[off+4] = se_tpg->proto_id; 4052 4053 /* 4054 * Now, have the $FABRIC_MOD fill in the transport ID. 4055 */ 4056 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4057 &format_code, &buf[off+4]); 4058 4059 spin_lock(&pr_tmpl->registration_lock); 4060 atomic_dec_mb(&pr_reg->pr_res_holders); 4061 4062 if (desc_len < 0) 4063 break; 4064 /* 4065 * Set the ADDITIONAL DESCRIPTOR LENGTH 4066 */ 4067 put_unaligned_be32(desc_len, &buf[off]); 4068 off += 4; 4069 /* 4070 * Size of full desctipor header minus TransportID 4071 * containing $FABRIC_MOD specific) initiator device/port 4072 * WWN information. 4073 * 4074 * See spc4r17 Section 6.13.5 Table 169 4075 */ 4076 add_desc_len = (24 + desc_len); 4077 4078 off += desc_len; 4079 add_len += add_desc_len; 4080 } 4081 spin_unlock(&pr_tmpl->registration_lock); 4082 /* 4083 * Set ADDITIONAL_LENGTH 4084 */ 4085 put_unaligned_be32(add_len, &buf[4]); 4086 target_set_cmd_data_length(cmd, 8 + add_len); 4087 4088 transport_kunmap_data_sg(cmd); 4089 4090 return 0; 4091 } 4092 4093 static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa) 4094 { 4095 struct exec_cmd_ops *ops = cmd->protocol_data; 4096 unsigned char *buf; 4097 sense_reason_t ret; 4098 4099 if (cmd->data_length < 8) { 4100 pr_err("PRIN SA SCSI Data Length: %u too small\n", 4101 cmd->data_length); 4102 return TCM_INVALID_CDB_FIELD; 4103 } 4104 4105 if (!ops->execute_pr_in) { 4106 pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n"); 4107 return TCM_UNSUPPORTED_SCSI_OPCODE; 4108 } 4109 4110 if (sa == PRI_READ_FULL_STATUS) { 4111 pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n"); 4112 return TCM_UNSUPPORTED_SCSI_OPCODE; 4113 } 4114 4115 buf = transport_kmap_data_sg(cmd); 4116 if (!buf) 4117 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4118 4119 ret = ops->execute_pr_in(cmd, sa, buf); 4120 4121 transport_kunmap_data_sg(cmd); 4122 return ret; 4123 } 4124 4125 sense_reason_t 4126 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4127 { 4128 u8 sa = cmd->t_task_cdb[1] & 0x1f; 4129 sense_reason_t ret; 4130 4131 /* 4132 * Following spc2r20 5.5.1 Reservations overview: 4133 * 4134 * If a logical unit has been reserved by any RESERVE command and is 4135 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4136 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4137 * initiator or service action and shall terminate with a RESERVATION 4138 * CONFLICT status. 4139 */ 4140 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4141 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4142 " SPC-2 reservation is held, returning" 4143 " RESERVATION_CONFLICT\n"); 4144 return TCM_RESERVATION_CONFLICT; 4145 } 4146 4147 if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) { 4148 ret = target_try_pr_in_pt(cmd, sa); 4149 goto done; 4150 } 4151 4152 switch (sa) { 4153 case PRI_READ_KEYS: 4154 ret = core_scsi3_pri_read_keys(cmd); 4155 break; 4156 case PRI_READ_RESERVATION: 4157 ret = core_scsi3_pri_read_reservation(cmd); 4158 break; 4159 case PRI_REPORT_CAPABILITIES: 4160 ret = core_scsi3_pri_report_capabilities(cmd); 4161 break; 4162 case PRI_READ_FULL_STATUS: 4163 ret = core_scsi3_pri_read_full_status(cmd); 4164 break; 4165 default: 4166 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4167 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4168 return TCM_INVALID_CDB_FIELD; 4169 } 4170 4171 done: 4172 if (!ret) 4173 target_complete_cmd(cmd, SAM_STAT_GOOD); 4174 return ret; 4175 } 4176 4177 sense_reason_t 4178 target_check_reservation(struct se_cmd *cmd) 4179 { 4180 struct se_device *dev = cmd->se_dev; 4181 sense_reason_t ret; 4182 4183 if (!cmd->se_sess) 4184 return 0; 4185 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4186 return 0; 4187 if (!dev->dev_attrib.emulate_pr) 4188 return 0; 4189 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4190 return 0; 4191 4192 spin_lock(&dev->dev_reservation_lock); 4193 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4194 ret = target_scsi2_reservation_check(cmd); 4195 else 4196 ret = target_scsi3_pr_reservation_check(cmd); 4197 spin_unlock(&dev->dev_reservation_lock); 4198 4199 return ret; 4200 } 4201