1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/file.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 39 #include "target_core_internal.h" 40 #include "target_core_pr.h" 41 #include "target_core_ua.h" 42 43 /* 44 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 45 */ 46 struct pr_transport_id_holder { 47 struct t10_pr_registration *dest_pr_reg; 48 struct se_portal_group *dest_tpg; 49 struct se_node_acl *dest_node_acl; 50 struct se_dev_entry *dest_se_deve; 51 struct list_head dest_list; 52 }; 53 54 void core_pr_dump_initiator_port( 55 struct t10_pr_registration *pr_reg, 56 char *buf, 57 u32 size) 58 { 59 if (!pr_reg->isid_present_at_reg) 60 buf[0] = '\0'; 61 62 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 63 } 64 65 enum register_type { 66 REGISTER, 67 REGISTER_AND_IGNORE_EXISTING_KEY, 68 REGISTER_AND_MOVE, 69 }; 70 71 enum preempt_type { 72 PREEMPT, 73 PREEMPT_AND_ABORT, 74 }; 75 76 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 77 struct t10_pr_registration *, int, int); 78 79 static int is_reservation_holder( 80 struct t10_pr_registration *pr_res_holder, 81 struct t10_pr_registration *pr_reg) 82 { 83 int pr_res_type; 84 85 if (pr_res_holder) { 86 pr_res_type = pr_res_holder->pr_res_type; 87 88 return pr_res_holder == pr_reg || 89 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 90 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 91 } 92 return 0; 93 } 94 95 static sense_reason_t 96 target_scsi2_reservation_check(struct se_cmd *cmd) 97 { 98 struct se_device *dev = cmd->se_dev; 99 struct se_session *sess = cmd->se_sess; 100 101 switch (cmd->t_task_cdb[0]) { 102 case INQUIRY: 103 case RELEASE: 104 case RELEASE_10: 105 return 0; 106 default: 107 break; 108 } 109 110 if (!dev->dev_reserved_node_acl || !sess) 111 return 0; 112 113 if (dev->dev_reserved_node_acl != sess->se_node_acl) 114 return TCM_RESERVATION_CONFLICT; 115 116 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 117 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 118 return TCM_RESERVATION_CONFLICT; 119 } 120 121 return 0; 122 } 123 124 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 125 struct se_node_acl *, struct se_session *); 126 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 127 128 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 129 { 130 struct se_session *se_sess = cmd->se_sess; 131 struct se_device *dev = cmd->se_dev; 132 struct t10_pr_registration *pr_reg; 133 struct t10_reservation *pr_tmpl = &dev->t10_pr; 134 int conflict = 0; 135 136 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 137 se_sess); 138 if (pr_reg) { 139 /* 140 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 141 * behavior 142 * 143 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 144 * status, but no reservation shall be established and the 145 * persistent reservation shall not be changed, if the command 146 * is received from a) and b) below. 147 * 148 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 149 * status, but the persistent reservation shall not be released, 150 * if the command is received from a) and b) 151 * 152 * a) An I_T nexus that is a persistent reservation holder; or 153 * b) An I_T nexus that is registered if a registrants only or 154 * all registrants type persistent reservation is present. 155 * 156 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 157 * RELEASE(6) command, or RELEASE(10) command shall be processed 158 * as defined in SPC-2. 159 */ 160 if (pr_reg->pr_res_holder) { 161 core_scsi3_put_pr_reg(pr_reg); 162 return 1; 163 } 164 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 165 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 166 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 168 core_scsi3_put_pr_reg(pr_reg); 169 return 1; 170 } 171 core_scsi3_put_pr_reg(pr_reg); 172 conflict = 1; 173 } else { 174 /* 175 * Following spc2r20 5.5.1 Reservations overview: 176 * 177 * If a logical unit has executed a PERSISTENT RESERVE OUT 178 * command with the REGISTER or the REGISTER AND IGNORE 179 * EXISTING KEY service action and is still registered by any 180 * initiator, all RESERVE commands and all RELEASE commands 181 * regardless of initiator shall conflict and shall terminate 182 * with a RESERVATION CONFLICT status. 183 */ 184 spin_lock(&pr_tmpl->registration_lock); 185 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 186 spin_unlock(&pr_tmpl->registration_lock); 187 } 188 189 if (conflict) { 190 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 191 " while active SPC-3 registrations exist," 192 " returning RESERVATION_CONFLICT\n"); 193 return -EBUSY; 194 } 195 196 return 0; 197 } 198 199 sense_reason_t 200 target_scsi2_reservation_release(struct se_cmd *cmd) 201 { 202 struct se_device *dev = cmd->se_dev; 203 struct se_session *sess = cmd->se_sess; 204 struct se_portal_group *tpg; 205 int rc; 206 207 if (!sess || !sess->se_tpg) 208 goto out; 209 rc = target_check_scsi2_reservation_conflict(cmd); 210 if (rc == 1) 211 goto out; 212 if (rc < 0) 213 return TCM_RESERVATION_CONFLICT; 214 215 spin_lock(&dev->dev_reservation_lock); 216 if (!dev->dev_reserved_node_acl || !sess) 217 goto out_unlock; 218 219 if (dev->dev_reserved_node_acl != sess->se_node_acl) 220 goto out_unlock; 221 222 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 223 goto out_unlock; 224 225 dev->dev_reserved_node_acl = NULL; 226 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 227 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 228 dev->dev_res_bin_isid = 0; 229 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 230 } 231 tpg = sess->se_tpg; 232 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 233 " MAPPED LUN: %llu for %s\n", 234 tpg->se_tpg_tfo->get_fabric_name(), 235 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 236 sess->se_node_acl->initiatorname); 237 238 out_unlock: 239 spin_unlock(&dev->dev_reservation_lock); 240 out: 241 target_complete_cmd(cmd, GOOD); 242 return 0; 243 } 244 245 sense_reason_t 246 target_scsi2_reservation_reserve(struct se_cmd *cmd) 247 { 248 struct se_device *dev = cmd->se_dev; 249 struct se_session *sess = cmd->se_sess; 250 struct se_portal_group *tpg; 251 sense_reason_t ret = 0; 252 int rc; 253 254 if ((cmd->t_task_cdb[1] & 0x01) && 255 (cmd->t_task_cdb[1] & 0x02)) { 256 pr_err("LongIO and Obselete Bits set, returning" 257 " ILLEGAL_REQUEST\n"); 258 return TCM_UNSUPPORTED_SCSI_OPCODE; 259 } 260 /* 261 * This is currently the case for target_core_mod passthrough struct se_cmd 262 * ops 263 */ 264 if (!sess || !sess->se_tpg) 265 goto out; 266 rc = target_check_scsi2_reservation_conflict(cmd); 267 if (rc == 1) 268 goto out; 269 270 if (rc < 0) 271 return TCM_RESERVATION_CONFLICT; 272 273 tpg = sess->se_tpg; 274 spin_lock(&dev->dev_reservation_lock); 275 if (dev->dev_reserved_node_acl && 276 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 277 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 278 tpg->se_tpg_tfo->get_fabric_name()); 279 pr_err("Original reserver LUN: %llu %s\n", 280 cmd->se_lun->unpacked_lun, 281 dev->dev_reserved_node_acl->initiatorname); 282 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 283 " from %s \n", cmd->se_lun->unpacked_lun, 284 cmd->orig_fe_lun, 285 sess->se_node_acl->initiatorname); 286 ret = TCM_RESERVATION_CONFLICT; 287 goto out_unlock; 288 } 289 290 dev->dev_reserved_node_acl = sess->se_node_acl; 291 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 292 if (sess->sess_bin_isid != 0) { 293 dev->dev_res_bin_isid = sess->sess_bin_isid; 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 295 } 296 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 297 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 298 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 299 sess->se_node_acl->initiatorname); 300 301 out_unlock: 302 spin_unlock(&dev->dev_reservation_lock); 303 out: 304 if (!ret) 305 target_complete_cmd(cmd, GOOD); 306 return ret; 307 } 308 309 310 /* 311 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 312 * 313 * This function is called by those initiator ports who are *NOT* 314 * the active PR reservation holder when a reservation is present. 315 */ 316 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 317 bool isid_mismatch) 318 { 319 unsigned char *cdb = cmd->t_task_cdb; 320 struct se_session *se_sess = cmd->se_sess; 321 struct se_node_acl *nacl = se_sess->se_node_acl; 322 int other_cdb = 0; 323 int registered_nexus = 0, ret = 1; /* Conflict by default */ 324 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 325 int we = 0; /* Write Exclusive */ 326 int legacy = 0; /* Act like a legacy device and return 327 * RESERVATION CONFLICT on some CDBs */ 328 329 if (isid_mismatch) { 330 registered_nexus = 0; 331 } else { 332 struct se_dev_entry *se_deve; 333 334 rcu_read_lock(); 335 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 336 if (se_deve) 337 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 338 &se_deve->deve_flags); 339 rcu_read_unlock(); 340 } 341 342 switch (pr_reg_type) { 343 case PR_TYPE_WRITE_EXCLUSIVE: 344 we = 1; 345 case PR_TYPE_EXCLUSIVE_ACCESS: 346 /* 347 * Some commands are only allowed for the persistent reservation 348 * holder. 349 */ 350 break; 351 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 352 we = 1; 353 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 354 /* 355 * Some commands are only allowed for registered I_T Nexuses. 356 */ 357 reg_only = 1; 358 break; 359 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 360 we = 1; 361 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 362 /* 363 * Each registered I_T Nexus is a reservation holder. 364 */ 365 all_reg = 1; 366 break; 367 default: 368 return -EINVAL; 369 } 370 /* 371 * Referenced from spc4r17 table 45 for *NON* PR holder access 372 */ 373 switch (cdb[0]) { 374 case SECURITY_PROTOCOL_IN: 375 if (registered_nexus) 376 return 0; 377 ret = (we) ? 0 : 1; 378 break; 379 case MODE_SENSE: 380 case MODE_SENSE_10: 381 case READ_ATTRIBUTE: 382 case READ_BUFFER: 383 case RECEIVE_DIAGNOSTIC: 384 if (legacy) { 385 ret = 1; 386 break; 387 } 388 if (registered_nexus) { 389 ret = 0; 390 break; 391 } 392 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 393 break; 394 case PERSISTENT_RESERVE_OUT: 395 /* 396 * This follows PERSISTENT_RESERVE_OUT service actions that 397 * are allowed in the presence of various reservations. 398 * See spc4r17, table 46 399 */ 400 switch (cdb[1] & 0x1f) { 401 case PRO_CLEAR: 402 case PRO_PREEMPT: 403 case PRO_PREEMPT_AND_ABORT: 404 ret = (registered_nexus) ? 0 : 1; 405 break; 406 case PRO_REGISTER: 407 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 408 ret = 0; 409 break; 410 case PRO_REGISTER_AND_MOVE: 411 case PRO_RESERVE: 412 ret = 1; 413 break; 414 case PRO_RELEASE: 415 ret = (registered_nexus) ? 0 : 1; 416 break; 417 default: 418 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 419 " action: 0x%02x\n", cdb[1] & 0x1f); 420 return -EINVAL; 421 } 422 break; 423 case RELEASE: 424 case RELEASE_10: 425 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 426 ret = 0; 427 break; 428 case RESERVE: 429 case RESERVE_10: 430 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 431 ret = 0; 432 break; 433 case TEST_UNIT_READY: 434 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 435 break; 436 case MAINTENANCE_IN: 437 switch (cdb[1] & 0x1f) { 438 case MI_MANAGEMENT_PROTOCOL_IN: 439 if (registered_nexus) { 440 ret = 0; 441 break; 442 } 443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 444 break; 445 case MI_REPORT_SUPPORTED_OPERATION_CODES: 446 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 447 if (legacy) { 448 ret = 1; 449 break; 450 } 451 if (registered_nexus) { 452 ret = 0; 453 break; 454 } 455 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 456 break; 457 case MI_REPORT_ALIASES: 458 case MI_REPORT_IDENTIFYING_INFORMATION: 459 case MI_REPORT_PRIORITY: 460 case MI_REPORT_TARGET_PGS: 461 case MI_REPORT_TIMESTAMP: 462 ret = 0; /* Allowed */ 463 break; 464 default: 465 pr_err("Unknown MI Service Action: 0x%02x\n", 466 (cdb[1] & 0x1f)); 467 return -EINVAL; 468 } 469 break; 470 case ACCESS_CONTROL_IN: 471 case ACCESS_CONTROL_OUT: 472 case INQUIRY: 473 case LOG_SENSE: 474 case SERVICE_ACTION_IN_12: 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 *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 pr_reg->pr_reg_deve = deve; 644 pr_reg->pr_res_mapped_lun = mapped_lun; 645 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 646 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 647 pr_reg->pr_res_key = sa_res_key; 648 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 649 pr_reg->pr_reg_aptpl = aptpl; 650 /* 651 * If an ISID value for this SCSI Initiator Port exists, 652 * save it to the registration now. 653 */ 654 if (isid != NULL) { 655 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 656 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 657 pr_reg->isid_present_at_reg = 1; 658 } 659 660 return pr_reg; 661 } 662 663 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 664 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 665 666 /* 667 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 668 * modes. 669 */ 670 static struct t10_pr_registration *__core_scsi3_alloc_registration( 671 struct se_device *dev, 672 struct se_node_acl *nacl, 673 struct se_lun *lun, 674 struct se_dev_entry *deve, 675 u64 mapped_lun, 676 unsigned char *isid, 677 u64 sa_res_key, 678 int all_tg_pt, 679 int aptpl) 680 { 681 struct se_dev_entry *deve_tmp; 682 struct se_node_acl *nacl_tmp; 683 struct se_lun_acl *lacl_tmp; 684 struct se_lun *lun_tmp, *next, *dest_lun; 685 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 686 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 687 int ret; 688 /* 689 * Create a registration for the I_T Nexus upon which the 690 * PROUT REGISTER was received. 691 */ 692 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 693 isid, sa_res_key, all_tg_pt, 694 aptpl); 695 if (!pr_reg) 696 return NULL; 697 /* 698 * Return pointer to pr_reg for ALL_TG_PT=0 699 */ 700 if (!all_tg_pt) 701 return pr_reg; 702 /* 703 * Create list of matching SCSI Initiator Port registrations 704 * for ALL_TG_PT=1 705 */ 706 spin_lock(&dev->se_port_lock); 707 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 708 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 709 continue; 710 spin_unlock(&dev->se_port_lock); 711 712 spin_lock_bh(&lun_tmp->lun_deve_lock); 713 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 714 /* 715 * This pointer will be NULL for demo mode MappedLUNs 716 * that have not been make explicit via a ConfigFS 717 * MappedLUN group for the SCSI Initiator Node ACL. 718 */ 719 if (!deve_tmp->se_lun_acl) 720 continue; 721 722 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 723 lockdep_is_held(&lun_tmp->lun_deve_lock)); 724 nacl_tmp = lacl_tmp->se_lun_nacl; 725 /* 726 * Skip the matching struct se_node_acl that is allocated 727 * above.. 728 */ 729 if (nacl == nacl_tmp) 730 continue; 731 /* 732 * Only perform PR registrations for target ports on 733 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 734 * arrived. 735 */ 736 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 737 continue; 738 /* 739 * Look for a matching Initiator Node ACL in ASCII format 740 */ 741 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 742 continue; 743 744 kref_get(&deve_tmp->pr_kref); 745 spin_unlock_bh(&lun_tmp->lun_deve_lock); 746 /* 747 * Grab a configfs group dependency that is released 748 * for the exception path at label out: below, or upon 749 * completion of adding ALL_TG_PT=1 registrations in 750 * __core_scsi3_add_registration() 751 */ 752 ret = core_scsi3_lunacl_depend_item(deve_tmp); 753 if (ret < 0) { 754 pr_err("core_scsi3_lunacl_depend" 755 "_item() failed\n"); 756 percpu_ref_put(&lun_tmp->lun_ref); 757 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 758 goto out; 759 } 760 /* 761 * Located a matching SCSI Initiator Port on a different 762 * port, allocate the pr_reg_atp and attach it to the 763 * pr_reg->pr_reg_atp_list that will be processed once 764 * the original *pr_reg is processed in 765 * __core_scsi3_add_registration() 766 */ 767 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 768 atomic_read(&deve_tmp->pr_kref.refcount) != 0); 769 770 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 771 nacl_tmp, dest_lun, deve_tmp, 772 deve_tmp->mapped_lun, NULL, 773 sa_res_key, all_tg_pt, aptpl); 774 if (!pr_reg_atp) { 775 percpu_ref_put(&lun_tmp->lun_ref); 776 core_scsi3_lunacl_undepend_item(deve_tmp); 777 goto out; 778 } 779 780 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 781 &pr_reg->pr_reg_atp_list); 782 spin_lock_bh(&lun_tmp->lun_deve_lock); 783 } 784 spin_unlock_bh(&lun_tmp->lun_deve_lock); 785 786 spin_lock(&dev->se_port_lock); 787 percpu_ref_put(&lun_tmp->lun_ref); 788 } 789 spin_unlock(&dev->se_port_lock); 790 791 return pr_reg; 792 out: 793 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 794 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 795 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 796 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 797 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 798 } 799 kmem_cache_free(t10_pr_reg_cache, pr_reg); 800 return NULL; 801 } 802 803 int core_scsi3_alloc_aptpl_registration( 804 struct t10_reservation *pr_tmpl, 805 u64 sa_res_key, 806 unsigned char *i_port, 807 unsigned char *isid, 808 u64 mapped_lun, 809 unsigned char *t_port, 810 u16 tpgt, 811 u64 target_lun, 812 int res_holder, 813 int all_tg_pt, 814 u8 type) 815 { 816 struct t10_pr_registration *pr_reg; 817 818 if (!i_port || !t_port || !sa_res_key) { 819 pr_err("Illegal parameters for APTPL registration\n"); 820 return -EINVAL; 821 } 822 823 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 824 if (!pr_reg) { 825 pr_err("Unable to allocate struct t10_pr_registration\n"); 826 return -ENOMEM; 827 } 828 829 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 830 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 831 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 832 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 833 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 834 atomic_set(&pr_reg->pr_res_holders, 0); 835 pr_reg->pr_reg_nacl = NULL; 836 pr_reg->pr_reg_deve = NULL; 837 pr_reg->pr_res_mapped_lun = mapped_lun; 838 pr_reg->pr_aptpl_target_lun = target_lun; 839 pr_reg->pr_res_key = sa_res_key; 840 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 841 pr_reg->pr_reg_aptpl = 1; 842 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 843 pr_reg->pr_res_type = type; 844 /* 845 * If an ISID value had been saved in APTPL metadata for this 846 * SCSI Initiator Port, restore it now. 847 */ 848 if (isid != NULL) { 849 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 850 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 851 pr_reg->isid_present_at_reg = 1; 852 } 853 /* 854 * Copy the i_port and t_port information from caller. 855 */ 856 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 857 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 858 pr_reg->pr_reg_tpgt = tpgt; 859 /* 860 * Set pr_res_holder from caller, the pr_reg who is the reservation 861 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 862 * the Initiator Node LUN ACL from the fabric module is created for 863 * this registration. 864 */ 865 pr_reg->pr_res_holder = res_holder; 866 867 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 868 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 869 " metadata\n", (res_holder) ? "+reservation" : ""); 870 return 0; 871 } 872 873 static void core_scsi3_aptpl_reserve( 874 struct se_device *dev, 875 struct se_portal_group *tpg, 876 struct se_node_acl *node_acl, 877 struct t10_pr_registration *pr_reg) 878 { 879 char i_buf[PR_REG_ISID_ID_LEN]; 880 881 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 882 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 883 884 spin_lock(&dev->dev_reservation_lock); 885 dev->dev_pr_res_holder = pr_reg; 886 spin_unlock(&dev->dev_reservation_lock); 887 888 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 889 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 890 tpg->se_tpg_tfo->get_fabric_name(), 891 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 892 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 893 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 894 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 895 i_buf); 896 } 897 898 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 899 struct t10_pr_registration *, enum register_type, int); 900 901 static int __core_scsi3_check_aptpl_registration( 902 struct se_device *dev, 903 struct se_portal_group *tpg, 904 struct se_lun *lun, 905 u64 target_lun, 906 struct se_node_acl *nacl, 907 u64 mapped_lun) 908 { 909 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 910 struct t10_reservation *pr_tmpl = &dev->t10_pr; 911 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 912 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 913 u16 tpgt; 914 915 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 916 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 917 /* 918 * Copy Initiator Port information from struct se_node_acl 919 */ 920 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 921 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 922 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 923 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 924 /* 925 * Look for the matching registrations+reservation from those 926 * created from APTPL metadata. Note that multiple registrations 927 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 928 * TransportIDs. 929 */ 930 spin_lock(&pr_tmpl->aptpl_reg_lock); 931 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 932 pr_reg_aptpl_list) { 933 934 if (!strcmp(pr_reg->pr_iport, i_port) && 935 (pr_reg->pr_res_mapped_lun == mapped_lun) && 936 !(strcmp(pr_reg->pr_tport, t_port)) && 937 (pr_reg->pr_reg_tpgt == tpgt) && 938 (pr_reg->pr_aptpl_target_lun == target_lun)) { 939 940 pr_reg->pr_reg_nacl = nacl; 941 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 942 943 list_del(&pr_reg->pr_reg_aptpl_list); 944 spin_unlock(&pr_tmpl->aptpl_reg_lock); 945 /* 946 * At this point all of the pointers in *pr_reg will 947 * be setup, so go ahead and add the registration. 948 */ 949 950 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 951 /* 952 * If this registration is the reservation holder, 953 * make that happen now.. 954 */ 955 if (pr_reg->pr_res_holder) 956 core_scsi3_aptpl_reserve(dev, tpg, 957 nacl, pr_reg); 958 /* 959 * Reenable pr_aptpl_active to accept new metadata 960 * updates once the SCSI device is active again.. 961 */ 962 spin_lock(&pr_tmpl->aptpl_reg_lock); 963 pr_tmpl->pr_aptpl_active = 1; 964 } 965 } 966 spin_unlock(&pr_tmpl->aptpl_reg_lock); 967 968 return 0; 969 } 970 971 int core_scsi3_check_aptpl_registration( 972 struct se_device *dev, 973 struct se_portal_group *tpg, 974 struct se_lun *lun, 975 struct se_node_acl *nacl, 976 u64 mapped_lun) 977 { 978 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 979 return 0; 980 981 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 982 lun->unpacked_lun, nacl, 983 mapped_lun); 984 } 985 986 static void __core_scsi3_dump_registration( 987 const struct target_core_fabric_ops *tfo, 988 struct se_device *dev, 989 struct se_node_acl *nacl, 990 struct t10_pr_registration *pr_reg, 991 enum register_type register_type) 992 { 993 struct se_portal_group *se_tpg = nacl->se_tpg; 994 char i_buf[PR_REG_ISID_ID_LEN]; 995 996 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 997 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 998 999 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1000 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1001 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1002 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1003 i_buf); 1004 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1005 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1006 tfo->tpg_get_tag(se_tpg)); 1007 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1008 " Port(s)\n", tfo->get_fabric_name(), 1009 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1010 dev->transport->name); 1011 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1012 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1013 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1014 pr_reg->pr_reg_aptpl); 1015 } 1016 1017 static void __core_scsi3_add_registration( 1018 struct se_device *dev, 1019 struct se_node_acl *nacl, 1020 struct t10_pr_registration *pr_reg, 1021 enum register_type register_type, 1022 int register_move) 1023 { 1024 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1025 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1026 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1027 struct se_dev_entry *deve; 1028 1029 /* 1030 * Increment PRgeneration counter for struct se_device upon a successful 1031 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1032 * 1033 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1034 * action, the struct se_device->dev_reservation_lock will already be held, 1035 * so we do not call core_scsi3_pr_generation() which grabs the lock 1036 * for the REGISTER. 1037 */ 1038 pr_reg->pr_res_generation = (register_move) ? 1039 dev->t10_pr.pr_generation++ : 1040 core_scsi3_pr_generation(dev); 1041 1042 spin_lock(&pr_tmpl->registration_lock); 1043 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1044 1045 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1046 spin_unlock(&pr_tmpl->registration_lock); 1047 1048 rcu_read_lock(); 1049 deve = pr_reg->pr_reg_deve; 1050 if (deve) 1051 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1052 rcu_read_unlock(); 1053 1054 /* 1055 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1056 */ 1057 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1058 return; 1059 /* 1060 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1061 * allocated in __core_scsi3_alloc_registration() 1062 */ 1063 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1064 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1065 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1066 1067 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1068 1069 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1070 1071 spin_lock(&pr_tmpl->registration_lock); 1072 list_add_tail(&pr_reg_tmp->pr_reg_list, 1073 &pr_tmpl->registration_list); 1074 1075 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1076 register_type); 1077 spin_unlock(&pr_tmpl->registration_lock); 1078 1079 rcu_read_lock(); 1080 deve = pr_reg_tmp->pr_reg_deve; 1081 if (deve) 1082 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1083 rcu_read_unlock(); 1084 1085 /* 1086 * Drop configfs group dependency reference from 1087 * __core_scsi3_alloc_registration() 1088 */ 1089 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1090 } 1091 } 1092 1093 static int core_scsi3_alloc_registration( 1094 struct se_device *dev, 1095 struct se_node_acl *nacl, 1096 struct se_lun *lun, 1097 struct se_dev_entry *deve, 1098 u64 mapped_lun, 1099 unsigned char *isid, 1100 u64 sa_res_key, 1101 int all_tg_pt, 1102 int aptpl, 1103 enum register_type register_type, 1104 int register_move) 1105 { 1106 struct t10_pr_registration *pr_reg; 1107 1108 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1109 isid, sa_res_key, all_tg_pt, 1110 aptpl); 1111 if (!pr_reg) 1112 return -EPERM; 1113 1114 __core_scsi3_add_registration(dev, nacl, pr_reg, 1115 register_type, register_move); 1116 return 0; 1117 } 1118 1119 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1120 struct se_device *dev, 1121 struct se_node_acl *nacl, 1122 unsigned char *isid) 1123 { 1124 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1125 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1126 struct se_portal_group *tpg; 1127 1128 spin_lock(&pr_tmpl->registration_lock); 1129 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1130 &pr_tmpl->registration_list, pr_reg_list) { 1131 /* 1132 * First look for a matching struct se_node_acl 1133 */ 1134 if (pr_reg->pr_reg_nacl != nacl) 1135 continue; 1136 1137 tpg = pr_reg->pr_reg_nacl->se_tpg; 1138 /* 1139 * If this registration does NOT contain a fabric provided 1140 * ISID, then we have found a match. 1141 */ 1142 if (!pr_reg->isid_present_at_reg) { 1143 /* 1144 * Determine if this SCSI device server requires that 1145 * SCSI Intiatior TransportID w/ ISIDs is enforced 1146 * for fabric modules (iSCSI) requiring them. 1147 */ 1148 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1149 if (dev->dev_attrib.enforce_pr_isids) 1150 continue; 1151 } 1152 atomic_inc_mb(&pr_reg->pr_res_holders); 1153 spin_unlock(&pr_tmpl->registration_lock); 1154 return pr_reg; 1155 } 1156 /* 1157 * If the *pr_reg contains a fabric defined ISID for multi-value 1158 * SCSI Initiator Port TransportIDs, then we expect a valid 1159 * matching ISID to be provided by the local SCSI Initiator Port. 1160 */ 1161 if (!isid) 1162 continue; 1163 if (strcmp(isid, pr_reg->pr_reg_isid)) 1164 continue; 1165 1166 atomic_inc_mb(&pr_reg->pr_res_holders); 1167 spin_unlock(&pr_tmpl->registration_lock); 1168 return pr_reg; 1169 } 1170 spin_unlock(&pr_tmpl->registration_lock); 1171 1172 return NULL; 1173 } 1174 1175 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1176 struct se_device *dev, 1177 struct se_node_acl *nacl, 1178 struct se_session *sess) 1179 { 1180 struct se_portal_group *tpg = nacl->se_tpg; 1181 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1182 1183 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1184 memset(&buf[0], 0, PR_REG_ISID_LEN); 1185 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1186 PR_REG_ISID_LEN); 1187 isid_ptr = &buf[0]; 1188 } 1189 1190 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1191 } 1192 1193 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1194 { 1195 atomic_dec_mb(&pr_reg->pr_res_holders); 1196 } 1197 1198 static int core_scsi3_check_implicit_release( 1199 struct se_device *dev, 1200 struct t10_pr_registration *pr_reg) 1201 { 1202 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1203 struct t10_pr_registration *pr_res_holder; 1204 int ret = 0; 1205 1206 spin_lock(&dev->dev_reservation_lock); 1207 pr_res_holder = dev->dev_pr_res_holder; 1208 if (!pr_res_holder) { 1209 spin_unlock(&dev->dev_reservation_lock); 1210 return ret; 1211 } 1212 if (pr_res_holder == pr_reg) { 1213 /* 1214 * Perform an implicit RELEASE if the registration that 1215 * is being released is holding the reservation. 1216 * 1217 * From spc4r17, section 5.7.11.1: 1218 * 1219 * e) If the I_T nexus is the persistent reservation holder 1220 * and the persistent reservation is not an all registrants 1221 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1222 * service action or REGISTER AND IGNORE EXISTING KEY 1223 * service action with the SERVICE ACTION RESERVATION KEY 1224 * field set to zero (see 5.7.11.3). 1225 */ 1226 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1227 ret = 1; 1228 /* 1229 * For 'All Registrants' reservation types, all existing 1230 * registrations are still processed as reservation holders 1231 * in core_scsi3_pr_seq_non_holder() after the initial 1232 * reservation holder is implicitly released here. 1233 */ 1234 } else if (pr_reg->pr_reg_all_tg_pt && 1235 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1236 pr_reg->pr_reg_nacl->initiatorname)) && 1237 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1238 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1239 " UNREGISTER while existing reservation with matching" 1240 " key 0x%016Lx is present from another SCSI Initiator" 1241 " Port\n", pr_reg->pr_res_key); 1242 ret = -EPERM; 1243 } 1244 spin_unlock(&dev->dev_reservation_lock); 1245 1246 return ret; 1247 } 1248 1249 /* 1250 * Called with struct t10_reservation->registration_lock held. 1251 */ 1252 static void __core_scsi3_free_registration( 1253 struct se_device *dev, 1254 struct t10_pr_registration *pr_reg, 1255 struct list_head *preempt_and_abort_list, 1256 int dec_holders) 1257 __releases(&pr_tmpl->registration_lock) 1258 __acquires(&pr_tmpl->registration_lock) 1259 { 1260 const struct target_core_fabric_ops *tfo = 1261 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1262 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1263 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1264 struct se_dev_entry *deve; 1265 char i_buf[PR_REG_ISID_ID_LEN]; 1266 1267 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1268 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1269 1270 if (!list_empty(&pr_reg->pr_reg_list)) 1271 list_del(&pr_reg->pr_reg_list); 1272 /* 1273 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1274 * so call core_scsi3_put_pr_reg() to decrement our reference. 1275 */ 1276 if (dec_holders) 1277 core_scsi3_put_pr_reg(pr_reg); 1278 1279 spin_unlock(&pr_tmpl->registration_lock); 1280 /* 1281 * Wait until all reference from any other I_T nexuses for this 1282 * *pr_reg have been released. Because list_del() is called above, 1283 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1284 * count back to zero, and we release *pr_reg. 1285 */ 1286 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1287 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1288 tfo->get_fabric_name()); 1289 cpu_relax(); 1290 } 1291 1292 rcu_read_lock(); 1293 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1294 if (deve) 1295 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1296 rcu_read_unlock(); 1297 1298 spin_lock(&pr_tmpl->registration_lock); 1299 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1300 " Node: %s%s\n", tfo->get_fabric_name(), 1301 pr_reg->pr_reg_nacl->initiatorname, 1302 i_buf); 1303 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1304 " Port(s)\n", tfo->get_fabric_name(), 1305 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1306 dev->transport->name); 1307 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1308 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1309 pr_reg->pr_res_generation); 1310 1311 if (!preempt_and_abort_list) { 1312 pr_reg->pr_reg_deve = NULL; 1313 pr_reg->pr_reg_nacl = NULL; 1314 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1315 return; 1316 } 1317 /* 1318 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1319 * are released once the ABORT_TASK_SET has completed.. 1320 */ 1321 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1322 } 1323 1324 void core_scsi3_free_pr_reg_from_nacl( 1325 struct se_device *dev, 1326 struct se_node_acl *nacl) 1327 { 1328 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1329 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1330 bool free_reg = false; 1331 /* 1332 * If the passed se_node_acl matches the reservation holder, 1333 * release the reservation. 1334 */ 1335 spin_lock(&dev->dev_reservation_lock); 1336 pr_res_holder = dev->dev_pr_res_holder; 1337 if ((pr_res_holder != NULL) && 1338 (pr_res_holder->pr_reg_nacl == nacl)) { 1339 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1340 free_reg = true; 1341 } 1342 spin_unlock(&dev->dev_reservation_lock); 1343 /* 1344 * Release any registration associated with the struct se_node_acl. 1345 */ 1346 spin_lock(&pr_tmpl->registration_lock); 1347 if (pr_res_holder && free_reg) 1348 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1349 1350 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1351 &pr_tmpl->registration_list, pr_reg_list) { 1352 1353 if (pr_reg->pr_reg_nacl != nacl) 1354 continue; 1355 1356 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1357 } 1358 spin_unlock(&pr_tmpl->registration_lock); 1359 } 1360 1361 void core_scsi3_free_all_registrations( 1362 struct se_device *dev) 1363 { 1364 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1365 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1366 1367 spin_lock(&dev->dev_reservation_lock); 1368 pr_res_holder = dev->dev_pr_res_holder; 1369 if (pr_res_holder != NULL) { 1370 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1371 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1372 pr_res_holder, 0, 0); 1373 } 1374 spin_unlock(&dev->dev_reservation_lock); 1375 1376 spin_lock(&pr_tmpl->registration_lock); 1377 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1378 &pr_tmpl->registration_list, pr_reg_list) { 1379 1380 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1381 } 1382 spin_unlock(&pr_tmpl->registration_lock); 1383 1384 spin_lock(&pr_tmpl->aptpl_reg_lock); 1385 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1386 pr_reg_aptpl_list) { 1387 list_del(&pr_reg->pr_reg_aptpl_list); 1388 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1389 } 1390 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1391 } 1392 1393 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1394 { 1395 return target_depend_item(&tpg->tpg_group.cg_item); 1396 } 1397 1398 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1399 { 1400 target_undepend_item(&tpg->tpg_group.cg_item); 1401 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1402 } 1403 1404 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1405 { 1406 if (nacl->dynamic_node_acl) 1407 return 0; 1408 return target_depend_item(&nacl->acl_group.cg_item); 1409 } 1410 1411 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1412 { 1413 if (!nacl->dynamic_node_acl) 1414 target_undepend_item(&nacl->acl_group.cg_item); 1415 atomic_dec_mb(&nacl->acl_pr_ref_count); 1416 } 1417 1418 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1419 { 1420 struct se_lun_acl *lun_acl; 1421 struct se_node_acl *nacl; 1422 struct se_portal_group *tpg; 1423 /* 1424 * For nacl->dynamic_node_acl=1 1425 */ 1426 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1427 atomic_read(&se_deve->pr_kref.refcount) != 0); 1428 if (!lun_acl) 1429 return 0; 1430 1431 nacl = lun_acl->se_lun_nacl; 1432 tpg = nacl->se_tpg; 1433 1434 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1435 } 1436 1437 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1438 { 1439 struct se_lun_acl *lun_acl; 1440 struct se_node_acl *nacl; 1441 struct se_portal_group *tpg; 1442 /* 1443 * For nacl->dynamic_node_acl=1 1444 */ 1445 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1446 atomic_read(&se_deve->pr_kref.refcount) != 0); 1447 if (!lun_acl) { 1448 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1449 return; 1450 } 1451 nacl = lun_acl->se_lun_nacl; 1452 tpg = nacl->se_tpg; 1453 1454 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1455 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1456 } 1457 1458 static sense_reason_t 1459 core_scsi3_decode_spec_i_port( 1460 struct se_cmd *cmd, 1461 struct se_portal_group *tpg, 1462 unsigned char *l_isid, 1463 u64 sa_res_key, 1464 int all_tg_pt, 1465 int aptpl) 1466 { 1467 struct se_device *dev = cmd->se_dev; 1468 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1469 struct se_session *se_sess = cmd->se_sess; 1470 struct se_node_acl *dest_node_acl = NULL; 1471 struct se_dev_entry *dest_se_deve = NULL; 1472 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1473 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1474 LIST_HEAD(tid_dest_list); 1475 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1476 unsigned char *buf, *ptr, proto_ident; 1477 const unsigned char *i_str; 1478 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1479 sense_reason_t ret; 1480 u32 tpdl, tid_len = 0; 1481 u32 dest_rtpi = 0; 1482 1483 /* 1484 * Allocate a struct pr_transport_id_holder and setup the 1485 * local_node_acl pointer and add to struct list_head tid_dest_list 1486 * for add registration processing in the loop of tid_dest_list below. 1487 */ 1488 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1489 if (!tidh_new) { 1490 pr_err("Unable to allocate tidh_new\n"); 1491 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1492 } 1493 INIT_LIST_HEAD(&tidh_new->dest_list); 1494 tidh_new->dest_tpg = tpg; 1495 tidh_new->dest_node_acl = se_sess->se_node_acl; 1496 1497 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1498 se_sess->se_node_acl, cmd->se_lun, 1499 NULL, cmd->orig_fe_lun, l_isid, 1500 sa_res_key, all_tg_pt, aptpl); 1501 if (!local_pr_reg) { 1502 kfree(tidh_new); 1503 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1504 } 1505 tidh_new->dest_pr_reg = local_pr_reg; 1506 /* 1507 * The local I_T nexus does not hold any configfs dependances, 1508 * so we set tidh_new->dest_se_deve to NULL to prevent the 1509 * configfs_undepend_item() calls in the tid_dest_list loops below. 1510 */ 1511 tidh_new->dest_se_deve = NULL; 1512 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1513 1514 if (cmd->data_length < 28) { 1515 pr_warn("SPC-PR: Received PR OUT parameter list" 1516 " length too small: %u\n", cmd->data_length); 1517 ret = TCM_INVALID_PARAMETER_LIST; 1518 goto out; 1519 } 1520 1521 buf = transport_kmap_data_sg(cmd); 1522 if (!buf) { 1523 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1524 goto out; 1525 } 1526 1527 /* 1528 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1529 * first extract TransportID Parameter Data Length, and make sure 1530 * the value matches up to the SCSI expected data transfer length. 1531 */ 1532 tpdl = (buf[24] & 0xff) << 24; 1533 tpdl |= (buf[25] & 0xff) << 16; 1534 tpdl |= (buf[26] & 0xff) << 8; 1535 tpdl |= buf[27] & 0xff; 1536 1537 if ((tpdl + 28) != cmd->data_length) { 1538 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1539 " does not equal CDB data_length: %u\n", tpdl, 1540 cmd->data_length); 1541 ret = TCM_INVALID_PARAMETER_LIST; 1542 goto out_unmap; 1543 } 1544 /* 1545 * Start processing the received transport IDs using the 1546 * receiving I_T Nexus portal's fabric dependent methods to 1547 * obtain the SCSI Initiator Port/Device Identifiers. 1548 */ 1549 ptr = &buf[28]; 1550 1551 while (tpdl > 0) { 1552 struct se_lun *dest_lun, *tmp_lun; 1553 1554 proto_ident = (ptr[0] & 0x0f); 1555 dest_tpg = NULL; 1556 1557 spin_lock(&dev->se_port_lock); 1558 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1559 tmp_tpg = tmp_lun->lun_tpg; 1560 1561 /* 1562 * Look for the matching proto_ident provided by 1563 * the received TransportID 1564 */ 1565 if (tmp_tpg->proto_id != proto_ident) 1566 continue; 1567 dest_rtpi = tmp_lun->lun_rtpi; 1568 1569 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1570 (const char *)ptr, &tid_len, &iport_ptr); 1571 if (!i_str) 1572 continue; 1573 1574 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1575 spin_unlock(&dev->se_port_lock); 1576 1577 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1578 pr_err(" core_scsi3_tpg_depend_item()" 1579 " for tmp_tpg\n"); 1580 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1581 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1582 goto out_unmap; 1583 } 1584 /* 1585 * Locate the destination initiator ACL to be registered 1586 * from the decoded fabric module specific TransportID 1587 * at *i_str. 1588 */ 1589 mutex_lock(&tmp_tpg->acl_node_mutex); 1590 dest_node_acl = __core_tpg_get_initiator_node_acl( 1591 tmp_tpg, i_str); 1592 if (dest_node_acl) 1593 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1594 mutex_unlock(&tmp_tpg->acl_node_mutex); 1595 1596 if (!dest_node_acl) { 1597 core_scsi3_tpg_undepend_item(tmp_tpg); 1598 spin_lock(&dev->se_port_lock); 1599 continue; 1600 } 1601 1602 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1603 pr_err("configfs_depend_item() failed" 1604 " for dest_node_acl->acl_group\n"); 1605 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1606 core_scsi3_tpg_undepend_item(tmp_tpg); 1607 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1608 goto out_unmap; 1609 } 1610 1611 dest_tpg = tmp_tpg; 1612 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1613 " %s Port RTPI: %hu\n", 1614 dest_tpg->se_tpg_tfo->get_fabric_name(), 1615 dest_node_acl->initiatorname, dest_rtpi); 1616 1617 spin_lock(&dev->se_port_lock); 1618 break; 1619 } 1620 spin_unlock(&dev->se_port_lock); 1621 1622 if (!dest_tpg) { 1623 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1624 " dest_tpg\n"); 1625 ret = TCM_INVALID_PARAMETER_LIST; 1626 goto out_unmap; 1627 } 1628 1629 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1630 " tid_len: %d for %s + %s\n", 1631 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1632 tpdl, tid_len, i_str, iport_ptr); 1633 1634 if (tid_len > tpdl) { 1635 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1636 " %u for Transport ID: %s\n", tid_len, ptr); 1637 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1638 core_scsi3_tpg_undepend_item(dest_tpg); 1639 ret = TCM_INVALID_PARAMETER_LIST; 1640 goto out_unmap; 1641 } 1642 /* 1643 * Locate the desintation struct se_dev_entry pointer for matching 1644 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1645 * Target Port. 1646 */ 1647 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1648 dest_rtpi); 1649 if (!dest_se_deve) { 1650 pr_err("Unable to locate %s dest_se_deve" 1651 " from destination RTPI: %hu\n", 1652 dest_tpg->se_tpg_tfo->get_fabric_name(), 1653 dest_rtpi); 1654 1655 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1656 core_scsi3_tpg_undepend_item(dest_tpg); 1657 ret = TCM_INVALID_PARAMETER_LIST; 1658 goto out_unmap; 1659 } 1660 1661 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1662 pr_err("core_scsi3_lunacl_depend_item()" 1663 " failed\n"); 1664 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1665 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1666 core_scsi3_tpg_undepend_item(dest_tpg); 1667 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1668 goto out_unmap; 1669 } 1670 1671 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1672 " dest_se_deve mapped_lun: %llu\n", 1673 dest_tpg->se_tpg_tfo->get_fabric_name(), 1674 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1675 1676 /* 1677 * Skip any TransportIDs that already have a registration for 1678 * this target port. 1679 */ 1680 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1681 iport_ptr); 1682 if (pr_reg_e) { 1683 core_scsi3_put_pr_reg(pr_reg_e); 1684 core_scsi3_lunacl_undepend_item(dest_se_deve); 1685 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1686 core_scsi3_tpg_undepend_item(dest_tpg); 1687 ptr += tid_len; 1688 tpdl -= tid_len; 1689 tid_len = 0; 1690 continue; 1691 } 1692 /* 1693 * Allocate a struct pr_transport_id_holder and setup 1694 * the dest_node_acl and dest_se_deve pointers for the 1695 * loop below. 1696 */ 1697 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1698 GFP_KERNEL); 1699 if (!tidh_new) { 1700 pr_err("Unable to allocate tidh_new\n"); 1701 core_scsi3_lunacl_undepend_item(dest_se_deve); 1702 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1703 core_scsi3_tpg_undepend_item(dest_tpg); 1704 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1705 goto out_unmap; 1706 } 1707 INIT_LIST_HEAD(&tidh_new->dest_list); 1708 tidh_new->dest_tpg = dest_tpg; 1709 tidh_new->dest_node_acl = dest_node_acl; 1710 tidh_new->dest_se_deve = dest_se_deve; 1711 1712 /* 1713 * Allocate, but do NOT add the registration for the 1714 * TransportID referenced SCSI Initiator port. This 1715 * done because of the following from spc4r17 in section 1716 * 6.14.3 wrt SPEC_I_PT: 1717 * 1718 * "If a registration fails for any initiator port (e.g., if th 1719 * logical unit does not have enough resources available to 1720 * hold the registration information), no registrations shall be 1721 * made, and the command shall be terminated with 1722 * CHECK CONDITION status." 1723 * 1724 * That means we call __core_scsi3_alloc_registration() here, 1725 * and then call __core_scsi3_add_registration() in the 1726 * 2nd loop which will never fail. 1727 */ 1728 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1729 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 1730 1731 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1732 dest_node_acl, dest_lun, dest_se_deve, 1733 dest_se_deve->mapped_lun, iport_ptr, 1734 sa_res_key, all_tg_pt, aptpl); 1735 if (!dest_pr_reg) { 1736 core_scsi3_lunacl_undepend_item(dest_se_deve); 1737 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1738 core_scsi3_tpg_undepend_item(dest_tpg); 1739 kfree(tidh_new); 1740 ret = TCM_INVALID_PARAMETER_LIST; 1741 goto out_unmap; 1742 } 1743 tidh_new->dest_pr_reg = dest_pr_reg; 1744 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1745 1746 ptr += tid_len; 1747 tpdl -= tid_len; 1748 tid_len = 0; 1749 1750 } 1751 1752 transport_kunmap_data_sg(cmd); 1753 1754 /* 1755 * Go ahead and create a registrations from tid_dest_list for the 1756 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1757 * and dest_se_deve. 1758 * 1759 * The SA Reservation Key from the PROUT is set for the 1760 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1761 * means that the TransportID Initiator port will be 1762 * registered on all of the target ports in the SCSI target device 1763 * ALL_TG_PT=0 means the registration will only be for the 1764 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1765 * was received. 1766 */ 1767 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1768 dest_tpg = tidh->dest_tpg; 1769 dest_node_acl = tidh->dest_node_acl; 1770 dest_se_deve = tidh->dest_se_deve; 1771 dest_pr_reg = tidh->dest_pr_reg; 1772 1773 list_del(&tidh->dest_list); 1774 kfree(tidh); 1775 1776 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1777 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1778 1779 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1780 dest_pr_reg, 0, 0); 1781 1782 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1783 " registered Transport ID for Node: %s%s Mapped LUN:" 1784 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1785 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1786 dest_se_deve->mapped_lun : 0); 1787 1788 if (!dest_se_deve) 1789 continue; 1790 1791 core_scsi3_lunacl_undepend_item(dest_se_deve); 1792 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1793 core_scsi3_tpg_undepend_item(dest_tpg); 1794 } 1795 1796 return 0; 1797 out_unmap: 1798 transport_kunmap_data_sg(cmd); 1799 out: 1800 /* 1801 * For the failure case, release everything from tid_dest_list 1802 * including *dest_pr_reg and the configfs dependances.. 1803 */ 1804 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1805 dest_tpg = tidh->dest_tpg; 1806 dest_node_acl = tidh->dest_node_acl; 1807 dest_se_deve = tidh->dest_se_deve; 1808 dest_pr_reg = tidh->dest_pr_reg; 1809 1810 list_del(&tidh->dest_list); 1811 kfree(tidh); 1812 /* 1813 * Release any extra ALL_TG_PT=1 registrations for 1814 * the SPEC_I_PT=1 case. 1815 */ 1816 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1817 &dest_pr_reg->pr_reg_atp_list, 1818 pr_reg_atp_mem_list) { 1819 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1820 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1821 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1822 } 1823 1824 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1825 1826 if (!dest_se_deve) 1827 continue; 1828 1829 core_scsi3_lunacl_undepend_item(dest_se_deve); 1830 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1831 core_scsi3_tpg_undepend_item(dest_tpg); 1832 } 1833 return ret; 1834 } 1835 1836 static int core_scsi3_update_aptpl_buf( 1837 struct se_device *dev, 1838 unsigned char *buf, 1839 u32 pr_aptpl_buf_len) 1840 { 1841 struct se_portal_group *tpg; 1842 struct t10_pr_registration *pr_reg; 1843 unsigned char tmp[512], isid_buf[32]; 1844 ssize_t len = 0; 1845 int reg_count = 0; 1846 int ret = 0; 1847 1848 spin_lock(&dev->dev_reservation_lock); 1849 spin_lock(&dev->t10_pr.registration_lock); 1850 /* 1851 * Walk the registration list.. 1852 */ 1853 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1854 pr_reg_list) { 1855 1856 tmp[0] = '\0'; 1857 isid_buf[0] = '\0'; 1858 tpg = pr_reg->pr_reg_nacl->se_tpg; 1859 /* 1860 * Write out any ISID value to APTPL metadata that was included 1861 * in the original registration. 1862 */ 1863 if (pr_reg->isid_present_at_reg) 1864 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1865 pr_reg->pr_reg_isid); 1866 /* 1867 * Include special metadata if the pr_reg matches the 1868 * reservation holder. 1869 */ 1870 if (dev->dev_pr_res_holder == pr_reg) { 1871 snprintf(tmp, 512, "PR_REG_START: %d" 1872 "\ninitiator_fabric=%s\n" 1873 "initiator_node=%s\n%s" 1874 "sa_res_key=%llu\n" 1875 "res_holder=1\nres_type=%02x\n" 1876 "res_scope=%02x\nres_all_tg_pt=%d\n" 1877 "mapped_lun=%llu\n", reg_count, 1878 tpg->se_tpg_tfo->get_fabric_name(), 1879 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1880 pr_reg->pr_res_key, pr_reg->pr_res_type, 1881 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1882 pr_reg->pr_res_mapped_lun); 1883 } else { 1884 snprintf(tmp, 512, "PR_REG_START: %d\n" 1885 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1886 "sa_res_key=%llu\nres_holder=0\n" 1887 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1888 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1889 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1890 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1891 pr_reg->pr_res_mapped_lun); 1892 } 1893 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1895 pr_err("Unable to update renaming APTPL metadata," 1896 " reallocating larger buffer\n"); 1897 ret = -EMSGSIZE; 1898 goto out; 1899 } 1900 len += sprintf(buf+len, "%s", tmp); 1901 1902 /* 1903 * Include information about the associated SCSI target port. 1904 */ 1905 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1906 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1907 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1908 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1909 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1910 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1911 reg_count); 1912 1913 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1914 pr_err("Unable to update renaming APTPL metadata," 1915 " reallocating larger buffer\n"); 1916 ret = -EMSGSIZE; 1917 goto out; 1918 } 1919 len += sprintf(buf+len, "%s", tmp); 1920 reg_count++; 1921 } 1922 1923 if (!reg_count) 1924 len += sprintf(buf+len, "No Registrations or Reservations"); 1925 1926 out: 1927 spin_unlock(&dev->t10_pr.registration_lock); 1928 spin_unlock(&dev->dev_reservation_lock); 1929 1930 return ret; 1931 } 1932 1933 static int __core_scsi3_write_aptpl_to_file( 1934 struct se_device *dev, 1935 unsigned char *buf) 1936 { 1937 struct t10_wwn *wwn = &dev->t10_wwn; 1938 struct file *file; 1939 int flags = O_RDWR | O_CREAT | O_TRUNC; 1940 char path[512]; 1941 u32 pr_aptpl_buf_len; 1942 int ret; 1943 1944 memset(path, 0, 512); 1945 1946 if (strlen(&wwn->unit_serial[0]) >= 512) { 1947 pr_err("WWN value for struct se_device does not fit" 1948 " into path buffer\n"); 1949 return -EMSGSIZE; 1950 } 1951 1952 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1953 file = filp_open(path, flags, 0600); 1954 if (IS_ERR(file)) { 1955 pr_err("filp_open(%s) for APTPL metadata" 1956 " failed\n", path); 1957 return PTR_ERR(file); 1958 } 1959 1960 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1961 1962 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1963 1964 if (ret < 0) 1965 pr_debug("Error writing APTPL metadata file: %s\n", path); 1966 fput(file); 1967 1968 return (ret < 0) ? -EIO : 0; 1969 } 1970 1971 /* 1972 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1973 * write out the updated metadata to struct file for this SCSI device. 1974 */ 1975 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1976 { 1977 unsigned char *buf; 1978 int rc, len = PR_APTPL_BUF_LEN; 1979 1980 if (!aptpl) { 1981 char *null_buf = "No Registrations or Reservations\n"; 1982 1983 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1984 dev->t10_pr.pr_aptpl_active = 0; 1985 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1986 1987 if (rc) 1988 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1989 1990 return 0; 1991 } 1992 retry: 1993 buf = vzalloc(len); 1994 if (!buf) 1995 return TCM_OUT_OF_RESOURCES; 1996 1997 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1998 if (rc < 0) { 1999 vfree(buf); 2000 len *= 2; 2001 goto retry; 2002 } 2003 2004 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2005 if (rc != 0) { 2006 pr_err("SPC-3 PR: Could not update APTPL\n"); 2007 vfree(buf); 2008 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2009 } 2010 dev->t10_pr.pr_aptpl_active = 1; 2011 vfree(buf); 2012 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2013 return 0; 2014 } 2015 2016 static sense_reason_t 2017 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2018 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2019 { 2020 struct se_session *se_sess = cmd->se_sess; 2021 struct se_device *dev = cmd->se_dev; 2022 struct se_lun *se_lun = cmd->se_lun; 2023 struct se_portal_group *se_tpg; 2024 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2025 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2026 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2027 sense_reason_t ret = TCM_NO_SENSE; 2028 int pr_holder = 0, type; 2029 2030 if (!se_sess || !se_lun) { 2031 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2032 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2033 } 2034 se_tpg = se_sess->se_tpg; 2035 2036 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2037 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2038 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2039 PR_REG_ISID_LEN); 2040 isid_ptr = &isid_buf[0]; 2041 } 2042 /* 2043 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2044 */ 2045 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2046 if (!pr_reg) { 2047 if (res_key) { 2048 pr_warn("SPC-3 PR: Reservation Key non-zero" 2049 " for SA REGISTER, returning CONFLICT\n"); 2050 return TCM_RESERVATION_CONFLICT; 2051 } 2052 /* 2053 * Do nothing but return GOOD status. 2054 */ 2055 if (!sa_res_key) 2056 return 0; 2057 2058 if (!spec_i_pt) { 2059 /* 2060 * Perform the Service Action REGISTER on the Initiator 2061 * Port Endpoint that the PRO was received from on the 2062 * Logical Unit of the SCSI device server. 2063 */ 2064 if (core_scsi3_alloc_registration(cmd->se_dev, 2065 se_sess->se_node_acl, cmd->se_lun, 2066 NULL, cmd->orig_fe_lun, isid_ptr, 2067 sa_res_key, all_tg_pt, aptpl, 2068 register_type, 0)) { 2069 pr_err("Unable to allocate" 2070 " struct t10_pr_registration\n"); 2071 return TCM_INVALID_PARAMETER_LIST; 2072 } 2073 } else { 2074 /* 2075 * Register both the Initiator port that received 2076 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2077 * TransportID from Parameter list and loop through 2078 * fabric dependent parameter list while calling 2079 * logic from of core_scsi3_alloc_registration() for 2080 * each TransportID provided SCSI Initiator Port/Device 2081 */ 2082 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2083 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2084 if (ret != 0) 2085 return ret; 2086 } 2087 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2088 } 2089 2090 /* ok, existing registration */ 2091 2092 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2093 pr_err("SPC-3 PR REGISTER: Received" 2094 " res_key: 0x%016Lx does not match" 2095 " existing SA REGISTER res_key:" 2096 " 0x%016Lx\n", res_key, 2097 pr_reg->pr_res_key); 2098 ret = TCM_RESERVATION_CONFLICT; 2099 goto out; 2100 } 2101 2102 if (spec_i_pt) { 2103 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2104 " set on a registered nexus\n"); 2105 ret = TCM_INVALID_PARAMETER_LIST; 2106 goto out; 2107 } 2108 2109 /* 2110 * An existing ALL_TG_PT=1 registration being released 2111 * must also set ALL_TG_PT=1 in the incoming PROUT. 2112 */ 2113 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2114 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2115 " registration exists, but ALL_TG_PT=1 bit not" 2116 " present in received PROUT\n"); 2117 ret = TCM_INVALID_CDB_FIELD; 2118 goto out; 2119 } 2120 2121 /* 2122 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2123 */ 2124 if (sa_res_key) { 2125 /* 2126 * Increment PRgeneration counter for struct se_device" 2127 * upon a successful REGISTER, see spc4r17 section 6.3.2 2128 * READ_KEYS service action. 2129 */ 2130 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2131 pr_reg->pr_res_key = sa_res_key; 2132 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2133 " Key for %s to: 0x%016Lx PRgeneration:" 2134 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2135 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2136 pr_reg->pr_reg_nacl->initiatorname, 2137 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2138 2139 } else { 2140 /* 2141 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2142 */ 2143 type = pr_reg->pr_res_type; 2144 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2145 pr_reg); 2146 if (pr_holder < 0) { 2147 ret = TCM_RESERVATION_CONFLICT; 2148 goto out; 2149 } 2150 2151 spin_lock(&pr_tmpl->registration_lock); 2152 /* 2153 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2154 * and matching pr_res_key. 2155 */ 2156 if (pr_reg->pr_reg_all_tg_pt) { 2157 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2158 &pr_tmpl->registration_list, 2159 pr_reg_list) { 2160 2161 if (!pr_reg_p->pr_reg_all_tg_pt) 2162 continue; 2163 if (pr_reg_p->pr_res_key != res_key) 2164 continue; 2165 if (pr_reg == pr_reg_p) 2166 continue; 2167 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2168 pr_reg_p->pr_reg_nacl->initiatorname)) 2169 continue; 2170 2171 __core_scsi3_free_registration(dev, 2172 pr_reg_p, NULL, 0); 2173 } 2174 } 2175 2176 /* 2177 * Release the calling I_T Nexus registration now.. 2178 */ 2179 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2180 pr_reg = NULL; 2181 2182 /* 2183 * From spc4r17, section 5.7.11.3 Unregistering 2184 * 2185 * If the persistent reservation is a registrants only 2186 * type, the device server shall establish a unit 2187 * attention condition for the initiator port associated 2188 * with every registered I_T nexus except for the I_T 2189 * nexus on which the PERSISTENT RESERVE OUT command was 2190 * received, with the additional sense code set to 2191 * RESERVATIONS RELEASED. 2192 */ 2193 if (pr_holder && 2194 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2195 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2196 list_for_each_entry(pr_reg_p, 2197 &pr_tmpl->registration_list, 2198 pr_reg_list) { 2199 2200 core_scsi3_ua_allocate( 2201 pr_reg_p->pr_reg_nacl, 2202 pr_reg_p->pr_res_mapped_lun, 2203 0x2A, 2204 ASCQ_2AH_RESERVATIONS_RELEASED); 2205 } 2206 } 2207 2208 spin_unlock(&pr_tmpl->registration_lock); 2209 } 2210 2211 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2212 2213 out: 2214 if (pr_reg) 2215 core_scsi3_put_pr_reg(pr_reg); 2216 return ret; 2217 } 2218 2219 unsigned char *core_scsi3_pr_dump_type(int type) 2220 { 2221 switch (type) { 2222 case PR_TYPE_WRITE_EXCLUSIVE: 2223 return "Write Exclusive Access"; 2224 case PR_TYPE_EXCLUSIVE_ACCESS: 2225 return "Exclusive Access"; 2226 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2227 return "Write Exclusive Access, Registrants Only"; 2228 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2229 return "Exclusive Access, Registrants Only"; 2230 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2231 return "Write Exclusive Access, All Registrants"; 2232 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2233 return "Exclusive Access, All Registrants"; 2234 default: 2235 break; 2236 } 2237 2238 return "Unknown SPC-3 PR Type"; 2239 } 2240 2241 static sense_reason_t 2242 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2243 { 2244 struct se_device *dev = cmd->se_dev; 2245 struct se_session *se_sess = cmd->se_sess; 2246 struct se_lun *se_lun = cmd->se_lun; 2247 struct t10_pr_registration *pr_reg, *pr_res_holder; 2248 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2249 char i_buf[PR_REG_ISID_ID_LEN]; 2250 sense_reason_t ret; 2251 2252 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2253 2254 if (!se_sess || !se_lun) { 2255 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2256 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2257 } 2258 /* 2259 * Locate the existing *pr_reg via struct se_node_acl pointers 2260 */ 2261 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2262 se_sess); 2263 if (!pr_reg) { 2264 pr_err("SPC-3 PR: Unable to locate" 2265 " PR_REGISTERED *pr_reg for RESERVE\n"); 2266 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2267 } 2268 /* 2269 * From spc4r17 Section 5.7.9: Reserving: 2270 * 2271 * An application client creates a persistent reservation by issuing 2272 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2273 * a registered I_T nexus with the following parameters: 2274 * a) RESERVATION KEY set to the value of the reservation key that is 2275 * registered with the logical unit for the I_T nexus; and 2276 */ 2277 if (res_key != pr_reg->pr_res_key) { 2278 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2279 " does not match existing SA REGISTER res_key:" 2280 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2281 ret = TCM_RESERVATION_CONFLICT; 2282 goto out_put_pr_reg; 2283 } 2284 /* 2285 * From spc4r17 Section 5.7.9: Reserving: 2286 * 2287 * From above: 2288 * b) TYPE field and SCOPE field set to the persistent reservation 2289 * being created. 2290 * 2291 * Only one persistent reservation is allowed at a time per logical unit 2292 * and that persistent reservation has a scope of LU_SCOPE. 2293 */ 2294 if (scope != PR_SCOPE_LU_SCOPE) { 2295 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2296 ret = TCM_INVALID_PARAMETER_LIST; 2297 goto out_put_pr_reg; 2298 } 2299 /* 2300 * See if we have an existing PR reservation holder pointer at 2301 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2302 * *pr_res_holder. 2303 */ 2304 spin_lock(&dev->dev_reservation_lock); 2305 pr_res_holder = dev->dev_pr_res_holder; 2306 if (pr_res_holder) { 2307 /* 2308 * From spc4r17 Section 5.7.9: Reserving: 2309 * 2310 * If the device server receives a PERSISTENT RESERVE OUT 2311 * command from an I_T nexus other than a persistent reservation 2312 * holder (see 5.7.10) that attempts to create a persistent 2313 * reservation when a persistent reservation already exists for 2314 * the logical unit, then the command shall be completed with 2315 * RESERVATION CONFLICT status. 2316 */ 2317 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2318 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2319 pr_err("SPC-3 PR: Attempted RESERVE from" 2320 " [%s]: %s while reservation already held by" 2321 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2322 cmd->se_tfo->get_fabric_name(), 2323 se_sess->se_node_acl->initiatorname, 2324 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2325 pr_res_holder->pr_reg_nacl->initiatorname); 2326 2327 spin_unlock(&dev->dev_reservation_lock); 2328 ret = TCM_RESERVATION_CONFLICT; 2329 goto out_put_pr_reg; 2330 } 2331 /* 2332 * From spc4r17 Section 5.7.9: Reserving: 2333 * 2334 * If a persistent reservation holder attempts to modify the 2335 * type or scope of an existing persistent reservation, the 2336 * command shall be completed with RESERVATION CONFLICT status. 2337 */ 2338 if ((pr_res_holder->pr_res_type != type) || 2339 (pr_res_holder->pr_res_scope != scope)) { 2340 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2341 pr_err("SPC-3 PR: Attempted RESERVE from" 2342 " [%s]: %s trying to change TYPE and/or SCOPE," 2343 " while reservation already held by [%s]: %s," 2344 " returning RESERVATION_CONFLICT\n", 2345 cmd->se_tfo->get_fabric_name(), 2346 se_sess->se_node_acl->initiatorname, 2347 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2348 pr_res_holder->pr_reg_nacl->initiatorname); 2349 2350 spin_unlock(&dev->dev_reservation_lock); 2351 ret = TCM_RESERVATION_CONFLICT; 2352 goto out_put_pr_reg; 2353 } 2354 /* 2355 * From spc4r17 Section 5.7.9: Reserving: 2356 * 2357 * If the device server receives a PERSISTENT RESERVE OUT 2358 * command with RESERVE service action where the TYPE field and 2359 * the SCOPE field contain the same values as the existing type 2360 * and scope from a persistent reservation holder, it shall not 2361 * make any change to the existing persistent reservation and 2362 * shall completethe command with GOOD status. 2363 */ 2364 spin_unlock(&dev->dev_reservation_lock); 2365 ret = 0; 2366 goto out_put_pr_reg; 2367 } 2368 /* 2369 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2370 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2371 */ 2372 pr_reg->pr_res_scope = scope; 2373 pr_reg->pr_res_type = type; 2374 pr_reg->pr_res_holder = 1; 2375 dev->dev_pr_res_holder = pr_reg; 2376 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2377 2378 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2379 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2380 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2381 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2382 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2383 cmd->se_tfo->get_fabric_name(), 2384 se_sess->se_node_acl->initiatorname, 2385 i_buf); 2386 spin_unlock(&dev->dev_reservation_lock); 2387 2388 if (pr_tmpl->pr_aptpl_active) 2389 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2390 2391 ret = 0; 2392 out_put_pr_reg: 2393 core_scsi3_put_pr_reg(pr_reg); 2394 return ret; 2395 } 2396 2397 static sense_reason_t 2398 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2399 u64 res_key) 2400 { 2401 switch (type) { 2402 case PR_TYPE_WRITE_EXCLUSIVE: 2403 case PR_TYPE_EXCLUSIVE_ACCESS: 2404 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2405 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2406 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2407 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2408 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2409 default: 2410 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2411 " 0x%02x\n", type); 2412 return TCM_INVALID_CDB_FIELD; 2413 } 2414 } 2415 2416 /* 2417 * Called with struct se_device->dev_reservation_lock held. 2418 */ 2419 static void __core_scsi3_complete_pro_release( 2420 struct se_device *dev, 2421 struct se_node_acl *se_nacl, 2422 struct t10_pr_registration *pr_reg, 2423 int explicit, 2424 int unreg) 2425 { 2426 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2427 char i_buf[PR_REG_ISID_ID_LEN]; 2428 int pr_res_type = 0, pr_res_scope = 0; 2429 2430 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2431 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2432 /* 2433 * Go ahead and release the current PR reservation holder. 2434 * If an All Registrants reservation is currently active and 2435 * a unregister operation is requested, replace the current 2436 * dev_pr_res_holder with another active registration. 2437 */ 2438 if (dev->dev_pr_res_holder) { 2439 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2440 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2441 dev->dev_pr_res_holder->pr_res_type = 0; 2442 dev->dev_pr_res_holder->pr_res_scope = 0; 2443 dev->dev_pr_res_holder->pr_res_holder = 0; 2444 dev->dev_pr_res_holder = NULL; 2445 } 2446 if (!unreg) 2447 goto out; 2448 2449 spin_lock(&dev->t10_pr.registration_lock); 2450 list_del_init(&pr_reg->pr_reg_list); 2451 /* 2452 * If the I_T nexus is a reservation holder, the persistent reservation 2453 * is of an all registrants type, and the I_T nexus is the last remaining 2454 * registered I_T nexus, then the device server shall also release the 2455 * persistent reservation. 2456 */ 2457 if (!list_empty(&dev->t10_pr.registration_list) && 2458 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2459 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2460 dev->dev_pr_res_holder = 2461 list_entry(dev->t10_pr.registration_list.next, 2462 struct t10_pr_registration, pr_reg_list); 2463 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2464 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2465 dev->dev_pr_res_holder->pr_res_holder = 1; 2466 } 2467 spin_unlock(&dev->t10_pr.registration_lock); 2468 out: 2469 if (!dev->dev_pr_res_holder) { 2470 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2471 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2472 tfo->get_fabric_name(), (explicit) ? "explicit" : 2473 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2474 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2475 } 2476 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2477 tfo->get_fabric_name(), se_nacl->initiatorname, 2478 i_buf); 2479 /* 2480 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2481 */ 2482 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2483 } 2484 2485 static sense_reason_t 2486 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2487 u64 res_key) 2488 { 2489 struct se_device *dev = cmd->se_dev; 2490 struct se_session *se_sess = cmd->se_sess; 2491 struct se_lun *se_lun = cmd->se_lun; 2492 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2493 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2494 sense_reason_t ret = 0; 2495 2496 if (!se_sess || !se_lun) { 2497 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2498 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2499 } 2500 /* 2501 * Locate the existing *pr_reg via struct se_node_acl pointers 2502 */ 2503 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2504 if (!pr_reg) { 2505 pr_err("SPC-3 PR: Unable to locate" 2506 " PR_REGISTERED *pr_reg for RELEASE\n"); 2507 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2508 } 2509 /* 2510 * From spc4r17 Section 5.7.11.2 Releasing: 2511 * 2512 * If there is no persistent reservation or in response to a persistent 2513 * reservation release request from a registered I_T nexus that is not a 2514 * persistent reservation holder (see 5.7.10), the device server shall 2515 * do the following: 2516 * 2517 * a) Not release the persistent reservation, if any; 2518 * b) Not remove any registrations; and 2519 * c) Complete the command with GOOD status. 2520 */ 2521 spin_lock(&dev->dev_reservation_lock); 2522 pr_res_holder = dev->dev_pr_res_holder; 2523 if (!pr_res_holder) { 2524 /* 2525 * No persistent reservation, return GOOD status. 2526 */ 2527 spin_unlock(&dev->dev_reservation_lock); 2528 goto out_put_pr_reg; 2529 } 2530 2531 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2532 /* 2533 * Release request from a registered I_T nexus that is not a 2534 * persistent reservation holder. return GOOD status. 2535 */ 2536 spin_unlock(&dev->dev_reservation_lock); 2537 goto out_put_pr_reg; 2538 } 2539 2540 /* 2541 * From spc4r17 Section 5.7.11.2 Releasing: 2542 * 2543 * Only the persistent reservation holder (see 5.7.10) is allowed to 2544 * release a persistent reservation. 2545 * 2546 * An application client releases the persistent reservation by issuing 2547 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2548 * an I_T nexus that is a persistent reservation holder with the 2549 * following parameters: 2550 * 2551 * a) RESERVATION KEY field set to the value of the reservation key 2552 * that is registered with the logical unit for the I_T nexus; 2553 */ 2554 if (res_key != pr_reg->pr_res_key) { 2555 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2556 " does not match existing SA REGISTER res_key:" 2557 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2558 spin_unlock(&dev->dev_reservation_lock); 2559 ret = TCM_RESERVATION_CONFLICT; 2560 goto out_put_pr_reg; 2561 } 2562 /* 2563 * From spc4r17 Section 5.7.11.2 Releasing and above: 2564 * 2565 * b) TYPE field and SCOPE field set to match the persistent 2566 * reservation being released. 2567 */ 2568 if ((pr_res_holder->pr_res_type != type) || 2569 (pr_res_holder->pr_res_scope != scope)) { 2570 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2571 pr_err("SPC-3 PR RELEASE: Attempted to release" 2572 " reservation from [%s]: %s with different TYPE " 2573 "and/or SCOPE while reservation already held by" 2574 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2575 cmd->se_tfo->get_fabric_name(), 2576 se_sess->se_node_acl->initiatorname, 2577 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2578 pr_res_holder->pr_reg_nacl->initiatorname); 2579 2580 spin_unlock(&dev->dev_reservation_lock); 2581 ret = TCM_RESERVATION_CONFLICT; 2582 goto out_put_pr_reg; 2583 } 2584 /* 2585 * In response to a persistent reservation release request from the 2586 * persistent reservation holder the device server shall perform a 2587 * release by doing the following as an uninterrupted series of actions: 2588 * a) Release the persistent reservation; 2589 * b) Not remove any registration(s); 2590 * c) If the released persistent reservation is a registrants only type 2591 * or all registrants type persistent reservation, 2592 * the device server shall establish a unit attention condition for 2593 * the initiator port associated with every regis- 2594 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2595 * RESERVE OUT command with RELEASE service action was received, 2596 * with the additional sense code set to RESERVATIONS RELEASED; and 2597 * d) If the persistent reservation is of any other type, the device 2598 * server shall not establish a unit attention condition. 2599 */ 2600 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2601 pr_reg, 1, 0); 2602 2603 spin_unlock(&dev->dev_reservation_lock); 2604 2605 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2606 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2607 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2608 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2609 /* 2610 * If no UNIT ATTENTION conditions will be established for 2611 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2612 * go ahead and check for APTPL=1 update+write below 2613 */ 2614 goto write_aptpl; 2615 } 2616 2617 spin_lock(&pr_tmpl->registration_lock); 2618 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2619 pr_reg_list) { 2620 /* 2621 * Do not establish a UNIT ATTENTION condition 2622 * for the calling I_T Nexus 2623 */ 2624 if (pr_reg_p == pr_reg) 2625 continue; 2626 2627 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2628 pr_reg_p->pr_res_mapped_lun, 2629 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2630 } 2631 spin_unlock(&pr_tmpl->registration_lock); 2632 2633 write_aptpl: 2634 if (pr_tmpl->pr_aptpl_active) 2635 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2636 2637 out_put_pr_reg: 2638 core_scsi3_put_pr_reg(pr_reg); 2639 return ret; 2640 } 2641 2642 static sense_reason_t 2643 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2644 { 2645 struct se_device *dev = cmd->se_dev; 2646 struct se_node_acl *pr_reg_nacl; 2647 struct se_session *se_sess = cmd->se_sess; 2648 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2649 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2650 u64 pr_res_mapped_lun = 0; 2651 int calling_it_nexus = 0; 2652 /* 2653 * Locate the existing *pr_reg via struct se_node_acl pointers 2654 */ 2655 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2656 se_sess->se_node_acl, se_sess); 2657 if (!pr_reg_n) { 2658 pr_err("SPC-3 PR: Unable to locate" 2659 " PR_REGISTERED *pr_reg for CLEAR\n"); 2660 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2661 } 2662 /* 2663 * From spc4r17 section 5.7.11.6, Clearing: 2664 * 2665 * Any application client may release the persistent reservation and 2666 * remove all registrations from a device server by issuing a 2667 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2668 * registered I_T nexus with the following parameter: 2669 * 2670 * a) RESERVATION KEY field set to the value of the reservation key 2671 * that is registered with the logical unit for the I_T nexus. 2672 */ 2673 if (res_key != pr_reg_n->pr_res_key) { 2674 pr_err("SPC-3 PR REGISTER: Received" 2675 " res_key: 0x%016Lx does not match" 2676 " existing SA REGISTER res_key:" 2677 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2678 core_scsi3_put_pr_reg(pr_reg_n); 2679 return TCM_RESERVATION_CONFLICT; 2680 } 2681 /* 2682 * a) Release the persistent reservation, if any; 2683 */ 2684 spin_lock(&dev->dev_reservation_lock); 2685 pr_res_holder = dev->dev_pr_res_holder; 2686 if (pr_res_holder) { 2687 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2688 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2689 pr_res_holder, 0, 0); 2690 } 2691 spin_unlock(&dev->dev_reservation_lock); 2692 /* 2693 * b) Remove all registration(s) (see spc4r17 5.7.7); 2694 */ 2695 spin_lock(&pr_tmpl->registration_lock); 2696 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2697 &pr_tmpl->registration_list, pr_reg_list) { 2698 2699 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2700 pr_reg_nacl = pr_reg->pr_reg_nacl; 2701 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2702 __core_scsi3_free_registration(dev, pr_reg, NULL, 2703 calling_it_nexus); 2704 /* 2705 * e) Establish a unit attention condition for the initiator 2706 * port associated with every registered I_T nexus other 2707 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2708 * command with CLEAR service action was received, with the 2709 * additional sense code set to RESERVATIONS PREEMPTED. 2710 */ 2711 if (!calling_it_nexus) 2712 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2713 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2714 } 2715 spin_unlock(&pr_tmpl->registration_lock); 2716 2717 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2718 cmd->se_tfo->get_fabric_name()); 2719 2720 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2721 2722 core_scsi3_pr_generation(dev); 2723 return 0; 2724 } 2725 2726 /* 2727 * Called with struct se_device->dev_reservation_lock held. 2728 */ 2729 static void __core_scsi3_complete_pro_preempt( 2730 struct se_device *dev, 2731 struct t10_pr_registration *pr_reg, 2732 struct list_head *preempt_and_abort_list, 2733 int type, 2734 int scope, 2735 enum preempt_type preempt_type) 2736 { 2737 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2738 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2739 char i_buf[PR_REG_ISID_ID_LEN]; 2740 2741 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2742 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2743 /* 2744 * Do an implicit RELEASE of the existing reservation. 2745 */ 2746 if (dev->dev_pr_res_holder) 2747 __core_scsi3_complete_pro_release(dev, nacl, 2748 dev->dev_pr_res_holder, 0, 0); 2749 2750 dev->dev_pr_res_holder = pr_reg; 2751 pr_reg->pr_res_holder = 1; 2752 pr_reg->pr_res_type = type; 2753 pr_reg->pr_res_scope = scope; 2754 2755 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2756 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2757 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2758 core_scsi3_pr_dump_type(type), 2759 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2760 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2761 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2762 nacl->initiatorname, i_buf); 2763 /* 2764 * For PREEMPT_AND_ABORT, add the preempting reservation's 2765 * struct t10_pr_registration to the list that will be compared 2766 * against received CDBs.. 2767 */ 2768 if (preempt_and_abort_list) 2769 list_add_tail(&pr_reg->pr_reg_abort_list, 2770 preempt_and_abort_list); 2771 } 2772 2773 static void core_scsi3_release_preempt_and_abort( 2774 struct list_head *preempt_and_abort_list, 2775 struct t10_pr_registration *pr_reg_holder) 2776 { 2777 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2778 2779 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2780 pr_reg_abort_list) { 2781 2782 list_del(&pr_reg->pr_reg_abort_list); 2783 if (pr_reg_holder == pr_reg) 2784 continue; 2785 if (pr_reg->pr_res_holder) { 2786 pr_warn("pr_reg->pr_res_holder still set\n"); 2787 continue; 2788 } 2789 2790 pr_reg->pr_reg_deve = NULL; 2791 pr_reg->pr_reg_nacl = NULL; 2792 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2793 } 2794 } 2795 2796 static sense_reason_t 2797 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2798 u64 sa_res_key, enum preempt_type preempt_type) 2799 { 2800 struct se_device *dev = cmd->se_dev; 2801 struct se_node_acl *pr_reg_nacl; 2802 struct se_session *se_sess = cmd->se_sess; 2803 LIST_HEAD(preempt_and_abort_list); 2804 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2805 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2806 u64 pr_res_mapped_lun = 0; 2807 int all_reg = 0, calling_it_nexus = 0; 2808 bool sa_res_key_unmatched = sa_res_key != 0; 2809 int prh_type = 0, prh_scope = 0; 2810 2811 if (!se_sess) 2812 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2813 2814 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2815 se_sess); 2816 if (!pr_reg_n) { 2817 pr_err("SPC-3 PR: Unable to locate" 2818 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2819 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2820 return TCM_RESERVATION_CONFLICT; 2821 } 2822 if (pr_reg_n->pr_res_key != res_key) { 2823 core_scsi3_put_pr_reg(pr_reg_n); 2824 return TCM_RESERVATION_CONFLICT; 2825 } 2826 if (scope != PR_SCOPE_LU_SCOPE) { 2827 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2828 core_scsi3_put_pr_reg(pr_reg_n); 2829 return TCM_INVALID_PARAMETER_LIST; 2830 } 2831 2832 spin_lock(&dev->dev_reservation_lock); 2833 pr_res_holder = dev->dev_pr_res_holder; 2834 if (pr_res_holder && 2835 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2836 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2837 all_reg = 1; 2838 2839 if (!all_reg && !sa_res_key) { 2840 spin_unlock(&dev->dev_reservation_lock); 2841 core_scsi3_put_pr_reg(pr_reg_n); 2842 return TCM_INVALID_PARAMETER_LIST; 2843 } 2844 /* 2845 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2846 * 2847 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2848 * persistent reservation holder or there is no persistent reservation 2849 * holder (i.e., there is no persistent reservation), then the device 2850 * server shall perform a preempt by doing the following in an 2851 * uninterrupted series of actions. (See below..) 2852 */ 2853 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2854 /* 2855 * No existing or SA Reservation Key matching reservations.. 2856 * 2857 * PROUT SA PREEMPT with All Registrant type reservations are 2858 * allowed to be processed without a matching SA Reservation Key 2859 */ 2860 spin_lock(&pr_tmpl->registration_lock); 2861 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2862 &pr_tmpl->registration_list, pr_reg_list) { 2863 /* 2864 * Removing of registrations in non all registrants 2865 * type reservations without a matching SA reservation 2866 * key. 2867 * 2868 * a) Remove the registrations for all I_T nexuses 2869 * specified by the SERVICE ACTION RESERVATION KEY 2870 * field; 2871 * b) Ignore the contents of the SCOPE and TYPE fields; 2872 * c) Process tasks as defined in 5.7.1; and 2873 * d) Establish a unit attention condition for the 2874 * initiator port associated with every I_T nexus 2875 * that lost its registration other than the I_T 2876 * nexus on which the PERSISTENT RESERVE OUT command 2877 * was received, with the additional sense code set 2878 * to REGISTRATIONS PREEMPTED. 2879 */ 2880 if (!all_reg) { 2881 if (pr_reg->pr_res_key != sa_res_key) 2882 continue; 2883 sa_res_key_unmatched = false; 2884 2885 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2886 pr_reg_nacl = pr_reg->pr_reg_nacl; 2887 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2888 __core_scsi3_free_registration(dev, pr_reg, 2889 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2890 NULL, calling_it_nexus); 2891 } else { 2892 /* 2893 * Case for any existing all registrants type 2894 * reservation, follow logic in spc4r17 section 2895 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2896 * 2897 * For a ZERO SA Reservation key, release 2898 * all other registrations and do an implicit 2899 * release of active persistent reservation. 2900 * 2901 * For a non-ZERO SA Reservation key, only 2902 * release the matching reservation key from 2903 * registrations. 2904 */ 2905 if ((sa_res_key) && 2906 (pr_reg->pr_res_key != sa_res_key)) 2907 continue; 2908 sa_res_key_unmatched = false; 2909 2910 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2911 if (calling_it_nexus) 2912 continue; 2913 2914 pr_reg_nacl = pr_reg->pr_reg_nacl; 2915 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2916 __core_scsi3_free_registration(dev, pr_reg, 2917 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2918 NULL, 0); 2919 } 2920 if (!calling_it_nexus) 2921 core_scsi3_ua_allocate(pr_reg_nacl, 2922 pr_res_mapped_lun, 0x2A, 2923 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2924 } 2925 spin_unlock(&pr_tmpl->registration_lock); 2926 /* 2927 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2928 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2929 * RESERVATION KEY field to a value that does not match any 2930 * registered reservation key, then the device server shall 2931 * complete the command with RESERVATION CONFLICT status. 2932 */ 2933 if (sa_res_key_unmatched) { 2934 spin_unlock(&dev->dev_reservation_lock); 2935 core_scsi3_put_pr_reg(pr_reg_n); 2936 return TCM_RESERVATION_CONFLICT; 2937 } 2938 /* 2939 * For an existing all registrants type reservation 2940 * with a zero SA rservation key, preempt the existing 2941 * reservation with the new PR type and scope. 2942 */ 2943 if (pr_res_holder && all_reg && !(sa_res_key)) { 2944 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2945 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2946 type, scope, preempt_type); 2947 2948 if (preempt_type == PREEMPT_AND_ABORT) 2949 core_scsi3_release_preempt_and_abort( 2950 &preempt_and_abort_list, pr_reg_n); 2951 } 2952 spin_unlock(&dev->dev_reservation_lock); 2953 2954 if (pr_tmpl->pr_aptpl_active) 2955 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2956 2957 core_scsi3_put_pr_reg(pr_reg_n); 2958 core_scsi3_pr_generation(cmd->se_dev); 2959 return 0; 2960 } 2961 /* 2962 * The PREEMPTing SA reservation key matches that of the 2963 * existing persistent reservation, first, we check if 2964 * we are preempting our own reservation. 2965 * From spc4r17, section 5.7.11.4.3 Preempting 2966 * persistent reservations and registration handling 2967 * 2968 * If an all registrants persistent reservation is not 2969 * present, it is not an error for the persistent 2970 * reservation holder to preempt itself (i.e., a 2971 * PERSISTENT RESERVE OUT with a PREEMPT service action 2972 * or a PREEMPT AND ABORT service action with the 2973 * SERVICE ACTION RESERVATION KEY value equal to the 2974 * persistent reservation holder's reservation key that 2975 * is received from the persistent reservation holder). 2976 * In that case, the device server shall establish the 2977 * new persistent reservation and maintain the 2978 * registration. 2979 */ 2980 prh_type = pr_res_holder->pr_res_type; 2981 prh_scope = pr_res_holder->pr_res_scope; 2982 /* 2983 * If the SERVICE ACTION RESERVATION KEY field identifies a 2984 * persistent reservation holder (see 5.7.10), the device 2985 * server shall perform a preempt by doing the following as 2986 * an uninterrupted series of actions: 2987 * 2988 * a) Release the persistent reservation for the holder 2989 * identified by the SERVICE ACTION RESERVATION KEY field; 2990 */ 2991 if (pr_reg_n != pr_res_holder) 2992 __core_scsi3_complete_pro_release(dev, 2993 pr_res_holder->pr_reg_nacl, 2994 dev->dev_pr_res_holder, 0, 0); 2995 /* 2996 * b) Remove the registrations for all I_T nexuses identified 2997 * by the SERVICE ACTION RESERVATION KEY field, except the 2998 * I_T nexus that is being used for the PERSISTENT RESERVE 2999 * OUT command. If an all registrants persistent reservation 3000 * is present and the SERVICE ACTION RESERVATION KEY field 3001 * is set to zero, then all registrations shall be removed 3002 * except for that of the I_T nexus that is being used for 3003 * the PERSISTENT RESERVE OUT command; 3004 */ 3005 spin_lock(&pr_tmpl->registration_lock); 3006 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3007 &pr_tmpl->registration_list, pr_reg_list) { 3008 3009 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3010 if (calling_it_nexus) 3011 continue; 3012 3013 if (pr_reg->pr_res_key != sa_res_key) 3014 continue; 3015 3016 pr_reg_nacl = pr_reg->pr_reg_nacl; 3017 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3018 __core_scsi3_free_registration(dev, pr_reg, 3019 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3020 calling_it_nexus); 3021 /* 3022 * e) Establish a unit attention condition for the initiator 3023 * port associated with every I_T nexus that lost its 3024 * persistent reservation and/or registration, with the 3025 * additional sense code set to REGISTRATIONS PREEMPTED; 3026 */ 3027 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3028 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3029 } 3030 spin_unlock(&pr_tmpl->registration_lock); 3031 /* 3032 * c) Establish a persistent reservation for the preempting 3033 * I_T nexus using the contents of the SCOPE and TYPE fields; 3034 */ 3035 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3036 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3037 type, scope, preempt_type); 3038 /* 3039 * d) Process tasks as defined in 5.7.1; 3040 * e) See above.. 3041 * f) If the type or scope has changed, then for every I_T nexus 3042 * whose reservation key was not removed, except for the I_T 3043 * nexus on which the PERSISTENT RESERVE OUT command was 3044 * received, the device server shall establish a unit 3045 * attention condition for the initiator port associated with 3046 * that I_T nexus, with the additional sense code set to 3047 * RESERVATIONS RELEASED. If the type or scope have not 3048 * changed, then no unit attention condition(s) shall be 3049 * established for this reason. 3050 */ 3051 if ((prh_type != type) || (prh_scope != scope)) { 3052 spin_lock(&pr_tmpl->registration_lock); 3053 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3054 &pr_tmpl->registration_list, pr_reg_list) { 3055 3056 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3057 if (calling_it_nexus) 3058 continue; 3059 3060 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3061 pr_reg->pr_res_mapped_lun, 0x2A, 3062 ASCQ_2AH_RESERVATIONS_RELEASED); 3063 } 3064 spin_unlock(&pr_tmpl->registration_lock); 3065 } 3066 spin_unlock(&dev->dev_reservation_lock); 3067 /* 3068 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3069 * All received CDBs for the matching existing reservation and 3070 * registrations undergo ABORT_TASK logic. 3071 * 3072 * From there, core_scsi3_release_preempt_and_abort() will 3073 * release every registration in the list (which have already 3074 * been removed from the primary pr_reg list), except the 3075 * new persistent reservation holder, the calling Initiator Port. 3076 */ 3077 if (preempt_type == PREEMPT_AND_ABORT) { 3078 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3079 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3080 pr_reg_n); 3081 } 3082 3083 if (pr_tmpl->pr_aptpl_active) 3084 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3085 3086 core_scsi3_put_pr_reg(pr_reg_n); 3087 core_scsi3_pr_generation(cmd->se_dev); 3088 return 0; 3089 } 3090 3091 static sense_reason_t 3092 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3093 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3094 { 3095 switch (type) { 3096 case PR_TYPE_WRITE_EXCLUSIVE: 3097 case PR_TYPE_EXCLUSIVE_ACCESS: 3098 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3099 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3100 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3101 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3102 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3103 sa_res_key, preempt_type); 3104 default: 3105 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3106 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3107 return TCM_INVALID_CDB_FIELD; 3108 } 3109 } 3110 3111 3112 static sense_reason_t 3113 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3114 u64 sa_res_key, int aptpl, int unreg) 3115 { 3116 struct se_session *se_sess = cmd->se_sess; 3117 struct se_device *dev = cmd->se_dev; 3118 struct se_dev_entry *dest_se_deve = NULL; 3119 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3120 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3121 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3122 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3123 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3124 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3125 unsigned char *buf; 3126 const unsigned char *initiator_str; 3127 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3128 u32 tid_len, tmp_tid_len; 3129 int new_reg = 0, type, scope, matching_iname; 3130 sense_reason_t ret; 3131 unsigned short rtpi; 3132 unsigned char proto_ident; 3133 3134 if (!se_sess || !se_lun) { 3135 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3136 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3137 } 3138 3139 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3140 se_tpg = se_sess->se_tpg; 3141 tf_ops = se_tpg->se_tpg_tfo; 3142 /* 3143 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3144 * Register behaviors for a REGISTER AND MOVE service action 3145 * 3146 * Locate the existing *pr_reg via struct se_node_acl pointers 3147 */ 3148 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3149 se_sess); 3150 if (!pr_reg) { 3151 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3152 " *pr_reg for REGISTER_AND_MOVE\n"); 3153 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3154 } 3155 /* 3156 * The provided reservation key much match the existing reservation key 3157 * provided during this initiator's I_T nexus registration. 3158 */ 3159 if (res_key != pr_reg->pr_res_key) { 3160 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3161 " res_key: 0x%016Lx does not match existing SA REGISTER" 3162 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3163 ret = TCM_RESERVATION_CONFLICT; 3164 goto out_put_pr_reg; 3165 } 3166 /* 3167 * The service active reservation key needs to be non zero 3168 */ 3169 if (!sa_res_key) { 3170 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3171 " sa_res_key\n"); 3172 ret = TCM_INVALID_PARAMETER_LIST; 3173 goto out_put_pr_reg; 3174 } 3175 3176 /* 3177 * Determine the Relative Target Port Identifier where the reservation 3178 * will be moved to for the TransportID containing SCSI initiator WWN 3179 * information. 3180 */ 3181 buf = transport_kmap_data_sg(cmd); 3182 if (!buf) { 3183 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3184 goto out_put_pr_reg; 3185 } 3186 3187 rtpi = (buf[18] & 0xff) << 8; 3188 rtpi |= buf[19] & 0xff; 3189 tid_len = (buf[20] & 0xff) << 24; 3190 tid_len |= (buf[21] & 0xff) << 16; 3191 tid_len |= (buf[22] & 0xff) << 8; 3192 tid_len |= buf[23] & 0xff; 3193 transport_kunmap_data_sg(cmd); 3194 buf = NULL; 3195 3196 if ((tid_len + 24) != cmd->data_length) { 3197 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3198 " does not equal CDB data_length: %u\n", tid_len, 3199 cmd->data_length); 3200 ret = TCM_INVALID_PARAMETER_LIST; 3201 goto out_put_pr_reg; 3202 } 3203 3204 spin_lock(&dev->se_port_lock); 3205 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3206 if (tmp_lun->lun_rtpi != rtpi) 3207 continue; 3208 dest_se_tpg = tmp_lun->lun_tpg; 3209 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3210 if (!dest_tf_ops) 3211 continue; 3212 3213 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3214 spin_unlock(&dev->se_port_lock); 3215 3216 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3217 pr_err("core_scsi3_tpg_depend_item() failed" 3218 " for dest_se_tpg\n"); 3219 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3220 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3221 goto out_put_pr_reg; 3222 } 3223 3224 spin_lock(&dev->se_port_lock); 3225 break; 3226 } 3227 spin_unlock(&dev->se_port_lock); 3228 3229 if (!dest_se_tpg || !dest_tf_ops) { 3230 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3231 " fabric ops from Relative Target Port Identifier:" 3232 " %hu\n", rtpi); 3233 ret = TCM_INVALID_PARAMETER_LIST; 3234 goto out_put_pr_reg; 3235 } 3236 3237 buf = transport_kmap_data_sg(cmd); 3238 if (!buf) { 3239 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3240 goto out_put_pr_reg; 3241 } 3242 proto_ident = (buf[24] & 0x0f); 3243 3244 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3245 " 0x%02x\n", proto_ident); 3246 3247 if (proto_ident != dest_se_tpg->proto_id) { 3248 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3249 " proto_ident: 0x%02x does not match ident: 0x%02x" 3250 " from fabric: %s\n", proto_ident, 3251 dest_se_tpg->proto_id, 3252 dest_tf_ops->get_fabric_name()); 3253 ret = TCM_INVALID_PARAMETER_LIST; 3254 goto out; 3255 } 3256 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3257 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3258 if (!initiator_str) { 3259 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3260 " initiator_str from Transport ID\n"); 3261 ret = TCM_INVALID_PARAMETER_LIST; 3262 goto out; 3263 } 3264 3265 transport_kunmap_data_sg(cmd); 3266 buf = NULL; 3267 3268 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3269 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3270 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3271 iport_ptr : ""); 3272 /* 3273 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3274 * action specifies a TransportID that is the same as the initiator port 3275 * of the I_T nexus for the command received, then the command shall 3276 * be terminated with CHECK CONDITION status, with the sense key set to 3277 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3278 * IN PARAMETER LIST. 3279 */ 3280 pr_reg_nacl = pr_reg->pr_reg_nacl; 3281 matching_iname = (!strcmp(initiator_str, 3282 pr_reg_nacl->initiatorname)) ? 1 : 0; 3283 if (!matching_iname) 3284 goto after_iport_check; 3285 3286 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3287 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3288 " matches: %s on received I_T Nexus\n", initiator_str, 3289 pr_reg_nacl->initiatorname); 3290 ret = TCM_INVALID_PARAMETER_LIST; 3291 goto out; 3292 } 3293 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3294 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3295 " matches: %s %s on received I_T Nexus\n", 3296 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3297 pr_reg->pr_reg_isid); 3298 ret = TCM_INVALID_PARAMETER_LIST; 3299 goto out; 3300 } 3301 after_iport_check: 3302 /* 3303 * Locate the destination struct se_node_acl from the received Transport ID 3304 */ 3305 mutex_lock(&dest_se_tpg->acl_node_mutex); 3306 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3307 initiator_str); 3308 if (dest_node_acl) 3309 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3310 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3311 3312 if (!dest_node_acl) { 3313 pr_err("Unable to locate %s dest_node_acl for" 3314 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3315 initiator_str); 3316 ret = TCM_INVALID_PARAMETER_LIST; 3317 goto out; 3318 } 3319 3320 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3321 pr_err("core_scsi3_nodeacl_depend_item() for" 3322 " dest_node_acl\n"); 3323 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3324 dest_node_acl = NULL; 3325 ret = TCM_INVALID_PARAMETER_LIST; 3326 goto out; 3327 } 3328 3329 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3330 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3331 dest_node_acl->initiatorname); 3332 3333 /* 3334 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3335 * PORT IDENTIFIER. 3336 */ 3337 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3338 if (!dest_se_deve) { 3339 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3340 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3341 ret = TCM_INVALID_PARAMETER_LIST; 3342 goto out; 3343 } 3344 3345 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3346 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3347 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3348 dest_se_deve = NULL; 3349 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3350 goto out; 3351 } 3352 3353 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3354 " ACL for dest_se_deve->mapped_lun: %llu\n", 3355 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3356 dest_se_deve->mapped_lun); 3357 3358 /* 3359 * A persistent reservation needs to already existing in order to 3360 * successfully complete the REGISTER_AND_MOVE service action.. 3361 */ 3362 spin_lock(&dev->dev_reservation_lock); 3363 pr_res_holder = dev->dev_pr_res_holder; 3364 if (!pr_res_holder) { 3365 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3366 " currently held\n"); 3367 spin_unlock(&dev->dev_reservation_lock); 3368 ret = TCM_INVALID_CDB_FIELD; 3369 goto out; 3370 } 3371 /* 3372 * The received on I_T Nexus must be the reservation holder. 3373 * 3374 * From spc4r17 section 5.7.8 Table 50 -- 3375 * Register behaviors for a REGISTER AND MOVE service action 3376 */ 3377 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3378 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3379 " Nexus is not reservation holder\n"); 3380 spin_unlock(&dev->dev_reservation_lock); 3381 ret = TCM_RESERVATION_CONFLICT; 3382 goto out; 3383 } 3384 /* 3385 * From spc4r17 section 5.7.8: registering and moving reservation 3386 * 3387 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3388 * action is received and the established persistent reservation is a 3389 * Write Exclusive - All Registrants type or Exclusive Access - 3390 * All Registrants type reservation, then the command shall be completed 3391 * with RESERVATION CONFLICT status. 3392 */ 3393 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3394 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3396 " reservation for type: %s\n", 3397 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3398 spin_unlock(&dev->dev_reservation_lock); 3399 ret = TCM_RESERVATION_CONFLICT; 3400 goto out; 3401 } 3402 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3403 /* 3404 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3405 */ 3406 type = pr_res_holder->pr_res_type; 3407 scope = pr_res_holder->pr_res_type; 3408 /* 3409 * c) Associate the reservation key specified in the SERVICE ACTION 3410 * RESERVATION KEY field with the I_T nexus specified as the 3411 * destination of the register and move, where: 3412 * A) The I_T nexus is specified by the TransportID and the 3413 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3414 * B) Regardless of the TransportID format used, the association for 3415 * the initiator port is based on either the initiator port name 3416 * (see 3.1.71) on SCSI transport protocols where port names are 3417 * required or the initiator port identifier (see 3.1.70) on SCSI 3418 * transport protocols where port names are not required; 3419 * d) Register the reservation key specified in the SERVICE ACTION 3420 * RESERVATION KEY field; 3421 * e) Retain the reservation key specified in the SERVICE ACTION 3422 * RESERVATION KEY field and associated information; 3423 * 3424 * Also, It is not an error for a REGISTER AND MOVE service action to 3425 * register an I_T nexus that is already registered with the same 3426 * reservation key or a different reservation key. 3427 */ 3428 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3429 iport_ptr); 3430 if (!dest_pr_reg) { 3431 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3432 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 3433 3434 spin_unlock(&dev->dev_reservation_lock); 3435 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3436 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3437 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3438 ret = TCM_INVALID_PARAMETER_LIST; 3439 goto out; 3440 } 3441 spin_lock(&dev->dev_reservation_lock); 3442 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3443 iport_ptr); 3444 new_reg = 1; 3445 } 3446 /* 3447 * f) Release the persistent reservation for the persistent reservation 3448 * holder (i.e., the I_T nexus on which the 3449 */ 3450 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3451 dev->dev_pr_res_holder, 0, 0); 3452 /* 3453 * g) Move the persistent reservation to the specified I_T nexus using 3454 * the same scope and type as the persistent reservation released in 3455 * item f); and 3456 */ 3457 dev->dev_pr_res_holder = dest_pr_reg; 3458 dest_pr_reg->pr_res_holder = 1; 3459 dest_pr_reg->pr_res_type = type; 3460 pr_reg->pr_res_scope = scope; 3461 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3462 /* 3463 * Increment PRGeneration for existing registrations.. 3464 */ 3465 if (!new_reg) 3466 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3467 spin_unlock(&dev->dev_reservation_lock); 3468 3469 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3470 " created new reservation holder TYPE: %s on object RTPI:" 3471 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3472 core_scsi3_pr_dump_type(type), rtpi, 3473 dest_pr_reg->pr_res_generation); 3474 pr_debug("SPC-3 PR Successfully moved reservation from" 3475 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3476 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3477 i_buf, dest_tf_ops->get_fabric_name(), 3478 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3479 iport_ptr : ""); 3480 /* 3481 * It is now safe to release configfs group dependencies for destination 3482 * of Transport ID Initiator Device/Port Identifier 3483 */ 3484 core_scsi3_lunacl_undepend_item(dest_se_deve); 3485 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3486 core_scsi3_tpg_undepend_item(dest_se_tpg); 3487 /* 3488 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3489 * nexus on which PERSISTENT RESERVE OUT command was received. 3490 */ 3491 if (unreg) { 3492 spin_lock(&pr_tmpl->registration_lock); 3493 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3494 spin_unlock(&pr_tmpl->registration_lock); 3495 } else 3496 core_scsi3_put_pr_reg(pr_reg); 3497 3498 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3499 3500 transport_kunmap_data_sg(cmd); 3501 3502 core_scsi3_put_pr_reg(dest_pr_reg); 3503 return 0; 3504 out: 3505 if (buf) 3506 transport_kunmap_data_sg(cmd); 3507 if (dest_se_deve) 3508 core_scsi3_lunacl_undepend_item(dest_se_deve); 3509 if (dest_node_acl) 3510 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3511 core_scsi3_tpg_undepend_item(dest_se_tpg); 3512 3513 out_put_pr_reg: 3514 core_scsi3_put_pr_reg(pr_reg); 3515 return ret; 3516 } 3517 3518 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3519 { 3520 unsigned int __v1, __v2; 3521 3522 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3523 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3524 3525 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3526 } 3527 3528 /* 3529 * See spc4r17 section 6.14 Table 170 3530 */ 3531 sense_reason_t 3532 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3533 { 3534 struct se_device *dev = cmd->se_dev; 3535 unsigned char *cdb = &cmd->t_task_cdb[0]; 3536 unsigned char *buf; 3537 u64 res_key, sa_res_key; 3538 int sa, scope, type, aptpl; 3539 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3540 sense_reason_t ret; 3541 3542 /* 3543 * Following spc2r20 5.5.1 Reservations overview: 3544 * 3545 * If a logical unit has been reserved by any RESERVE command and is 3546 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3547 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3548 * initiator or service action and shall terminate with a RESERVATION 3549 * CONFLICT status. 3550 */ 3551 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3552 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3553 " SPC-2 reservation is held, returning" 3554 " RESERVATION_CONFLICT\n"); 3555 return TCM_RESERVATION_CONFLICT; 3556 } 3557 3558 /* 3559 * FIXME: A NULL struct se_session pointer means an this is not coming from 3560 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3561 */ 3562 if (!cmd->se_sess) 3563 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3564 3565 if (cmd->data_length < 24) { 3566 pr_warn("SPC-PR: Received PR OUT parameter list" 3567 " length too small: %u\n", cmd->data_length); 3568 return TCM_INVALID_PARAMETER_LIST; 3569 } 3570 3571 /* 3572 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3573 */ 3574 sa = (cdb[1] & 0x1f); 3575 scope = (cdb[2] & 0xf0); 3576 type = (cdb[2] & 0x0f); 3577 3578 buf = transport_kmap_data_sg(cmd); 3579 if (!buf) 3580 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3581 3582 /* 3583 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3584 */ 3585 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3586 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3587 /* 3588 * REGISTER_AND_MOVE uses a different SA parameter list containing 3589 * SCSI TransportIDs. 3590 */ 3591 if (sa != PRO_REGISTER_AND_MOVE) { 3592 spec_i_pt = (buf[20] & 0x08); 3593 all_tg_pt = (buf[20] & 0x04); 3594 aptpl = (buf[20] & 0x01); 3595 } else { 3596 aptpl = (buf[17] & 0x01); 3597 unreg = (buf[17] & 0x02); 3598 } 3599 /* 3600 * If the backend device has been configured to force APTPL metadata 3601 * write-out, go ahead and propigate aptpl=1 down now. 3602 */ 3603 if (dev->dev_attrib.force_pr_aptpl) 3604 aptpl = 1; 3605 3606 transport_kunmap_data_sg(cmd); 3607 buf = NULL; 3608 3609 /* 3610 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3611 */ 3612 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3613 return TCM_INVALID_PARAMETER_LIST; 3614 3615 /* 3616 * From spc4r17 section 6.14: 3617 * 3618 * If the SPEC_I_PT bit is set to zero, the service action is not 3619 * REGISTER AND MOVE, and the parameter list length is not 24, then 3620 * the command shall be terminated with CHECK CONDITION status, with 3621 * the sense key set to ILLEGAL REQUEST, and the additional sense 3622 * code set to PARAMETER LIST LENGTH ERROR. 3623 */ 3624 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3625 (cmd->data_length != 24)) { 3626 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3627 " list length: %u\n", cmd->data_length); 3628 return TCM_INVALID_PARAMETER_LIST; 3629 } 3630 3631 /* 3632 * (core_scsi3_emulate_pro_* function parameters 3633 * are defined by spc4r17 Table 174: 3634 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3635 */ 3636 switch (sa) { 3637 case PRO_REGISTER: 3638 ret = core_scsi3_emulate_pro_register(cmd, 3639 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3640 break; 3641 case PRO_RESERVE: 3642 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3643 break; 3644 case PRO_RELEASE: 3645 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3646 break; 3647 case PRO_CLEAR: 3648 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3649 break; 3650 case PRO_PREEMPT: 3651 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3652 res_key, sa_res_key, PREEMPT); 3653 break; 3654 case PRO_PREEMPT_AND_ABORT: 3655 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3656 res_key, sa_res_key, PREEMPT_AND_ABORT); 3657 break; 3658 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3659 ret = core_scsi3_emulate_pro_register(cmd, 3660 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3661 break; 3662 case PRO_REGISTER_AND_MOVE: 3663 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3664 sa_res_key, aptpl, unreg); 3665 break; 3666 default: 3667 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3668 " action: 0x%02x\n", cdb[1] & 0x1f); 3669 return TCM_INVALID_CDB_FIELD; 3670 } 3671 3672 if (!ret) 3673 target_complete_cmd(cmd, GOOD); 3674 return ret; 3675 } 3676 3677 /* 3678 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3679 * 3680 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3681 */ 3682 static sense_reason_t 3683 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3684 { 3685 struct se_device *dev = cmd->se_dev; 3686 struct t10_pr_registration *pr_reg; 3687 unsigned char *buf; 3688 u32 add_len = 0, off = 8; 3689 3690 if (cmd->data_length < 8) { 3691 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3692 " too small\n", cmd->data_length); 3693 return TCM_INVALID_CDB_FIELD; 3694 } 3695 3696 buf = transport_kmap_data_sg(cmd); 3697 if (!buf) 3698 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3699 3700 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3701 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3702 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3703 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3704 3705 spin_lock(&dev->t10_pr.registration_lock); 3706 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3707 pr_reg_list) { 3708 /* 3709 * Check for overflow of 8byte PRI READ_KEYS payload and 3710 * next reservation key list descriptor. 3711 */ 3712 if ((add_len + 8) > (cmd->data_length - 8)) 3713 break; 3714 3715 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3716 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3717 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3718 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3719 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3720 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3721 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3722 buf[off++] = (pr_reg->pr_res_key & 0xff); 3723 3724 add_len += 8; 3725 } 3726 spin_unlock(&dev->t10_pr.registration_lock); 3727 3728 buf[4] = ((add_len >> 24) & 0xff); 3729 buf[5] = ((add_len >> 16) & 0xff); 3730 buf[6] = ((add_len >> 8) & 0xff); 3731 buf[7] = (add_len & 0xff); 3732 3733 transport_kunmap_data_sg(cmd); 3734 3735 return 0; 3736 } 3737 3738 /* 3739 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3740 * 3741 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3742 */ 3743 static sense_reason_t 3744 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3745 { 3746 struct se_device *dev = cmd->se_dev; 3747 struct t10_pr_registration *pr_reg; 3748 unsigned char *buf; 3749 u64 pr_res_key; 3750 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3751 3752 if (cmd->data_length < 8) { 3753 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3754 " too small\n", cmd->data_length); 3755 return TCM_INVALID_CDB_FIELD; 3756 } 3757 3758 buf = transport_kmap_data_sg(cmd); 3759 if (!buf) 3760 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3761 3762 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3763 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3764 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3765 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3766 3767 spin_lock(&dev->dev_reservation_lock); 3768 pr_reg = dev->dev_pr_res_holder; 3769 if (pr_reg) { 3770 /* 3771 * Set the hardcoded Additional Length 3772 */ 3773 buf[4] = ((add_len >> 24) & 0xff); 3774 buf[5] = ((add_len >> 16) & 0xff); 3775 buf[6] = ((add_len >> 8) & 0xff); 3776 buf[7] = (add_len & 0xff); 3777 3778 if (cmd->data_length < 22) 3779 goto err; 3780 3781 /* 3782 * Set the Reservation key. 3783 * 3784 * From spc4r17, section 5.7.10: 3785 * A persistent reservation holder has its reservation key 3786 * returned in the parameter data from a PERSISTENT 3787 * RESERVE IN command with READ RESERVATION service action as 3788 * follows: 3789 * a) For a persistent reservation of the type Write Exclusive 3790 * - All Registrants or Exclusive Access All Regitrants, 3791 * the reservation key shall be set to zero; or 3792 * b) For all other persistent reservation types, the 3793 * reservation key shall be set to the registered 3794 * reservation key for the I_T nexus that holds the 3795 * persistent reservation. 3796 */ 3797 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3798 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3799 pr_res_key = 0; 3800 else 3801 pr_res_key = pr_reg->pr_res_key; 3802 3803 buf[8] = ((pr_res_key >> 56) & 0xff); 3804 buf[9] = ((pr_res_key >> 48) & 0xff); 3805 buf[10] = ((pr_res_key >> 40) & 0xff); 3806 buf[11] = ((pr_res_key >> 32) & 0xff); 3807 buf[12] = ((pr_res_key >> 24) & 0xff); 3808 buf[13] = ((pr_res_key >> 16) & 0xff); 3809 buf[14] = ((pr_res_key >> 8) & 0xff); 3810 buf[15] = (pr_res_key & 0xff); 3811 /* 3812 * Set the SCOPE and TYPE 3813 */ 3814 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3815 (pr_reg->pr_res_type & 0x0f); 3816 } 3817 3818 err: 3819 spin_unlock(&dev->dev_reservation_lock); 3820 transport_kunmap_data_sg(cmd); 3821 3822 return 0; 3823 } 3824 3825 /* 3826 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3827 * 3828 * See spc4r17 section 6.13.4 Table 165 3829 */ 3830 static sense_reason_t 3831 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3832 { 3833 struct se_device *dev = cmd->se_dev; 3834 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3835 unsigned char *buf; 3836 u16 add_len = 8; /* Hardcoded to 8. */ 3837 3838 if (cmd->data_length < 6) { 3839 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3840 " %u too small\n", cmd->data_length); 3841 return TCM_INVALID_CDB_FIELD; 3842 } 3843 3844 buf = transport_kmap_data_sg(cmd); 3845 if (!buf) 3846 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3847 3848 buf[0] = ((add_len >> 8) & 0xff); 3849 buf[1] = (add_len & 0xff); 3850 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3851 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3852 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3853 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3854 /* 3855 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3856 * set the TMV: Task Mask Valid bit. 3857 */ 3858 buf[3] |= 0x80; 3859 /* 3860 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3861 */ 3862 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3863 /* 3864 * PTPL_A: Persistence across Target Power Loss Active bit 3865 */ 3866 if (pr_tmpl->pr_aptpl_active) 3867 buf[3] |= 0x01; 3868 /* 3869 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3870 */ 3871 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3872 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3873 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3874 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3875 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3876 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3877 3878 transport_kunmap_data_sg(cmd); 3879 3880 return 0; 3881 } 3882 3883 /* 3884 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3885 * 3886 * See spc4r17 section 6.13.5 Table 168 and 169 3887 */ 3888 static sense_reason_t 3889 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3890 { 3891 struct se_device *dev = cmd->se_dev; 3892 struct se_node_acl *se_nacl; 3893 struct se_portal_group *se_tpg; 3894 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3895 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3896 unsigned char *buf; 3897 u32 add_desc_len = 0, add_len = 0; 3898 u32 off = 8; /* off into first Full Status descriptor */ 3899 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3900 int exp_desc_len, desc_len; 3901 bool all_reg = false; 3902 3903 if (cmd->data_length < 8) { 3904 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3905 " too small\n", cmd->data_length); 3906 return TCM_INVALID_CDB_FIELD; 3907 } 3908 3909 buf = transport_kmap_data_sg(cmd); 3910 if (!buf) 3911 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3912 3913 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3914 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3915 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3916 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3917 3918 spin_lock(&dev->dev_reservation_lock); 3919 if (dev->dev_pr_res_holder) { 3920 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3921 3922 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3923 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3924 all_reg = true; 3925 pr_res_type = pr_holder->pr_res_type; 3926 pr_res_scope = pr_holder->pr_res_scope; 3927 } 3928 } 3929 spin_unlock(&dev->dev_reservation_lock); 3930 3931 spin_lock(&pr_tmpl->registration_lock); 3932 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3933 &pr_tmpl->registration_list, pr_reg_list) { 3934 3935 se_nacl = pr_reg->pr_reg_nacl; 3936 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3937 add_desc_len = 0; 3938 3939 atomic_inc_mb(&pr_reg->pr_res_holders); 3940 spin_unlock(&pr_tmpl->registration_lock); 3941 /* 3942 * Determine expected length of $FABRIC_MOD specific 3943 * TransportID full status descriptor.. 3944 */ 3945 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3946 &format_code); 3947 if (exp_desc_len < 0 || 3948 exp_desc_len + add_len > cmd->data_length) { 3949 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3950 " out of buffer: %d\n", cmd->data_length); 3951 spin_lock(&pr_tmpl->registration_lock); 3952 atomic_dec_mb(&pr_reg->pr_res_holders); 3953 break; 3954 } 3955 /* 3956 * Set RESERVATION KEY 3957 */ 3958 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3959 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3960 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3961 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3962 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3963 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3964 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3965 buf[off++] = (pr_reg->pr_res_key & 0xff); 3966 off += 4; /* Skip Over Reserved area */ 3967 3968 /* 3969 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3970 */ 3971 if (pr_reg->pr_reg_all_tg_pt) 3972 buf[off] = 0x02; 3973 /* 3974 * The struct se_lun pointer will be present for the 3975 * reservation holder for PR_HOLDER bit. 3976 * 3977 * Also, if this registration is the reservation 3978 * holder or there is an All Registrants reservation 3979 * active, fill in SCOPE and TYPE in the next byte. 3980 */ 3981 if (pr_reg->pr_res_holder) { 3982 buf[off++] |= 0x01; 3983 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3984 (pr_reg->pr_res_type & 0x0f); 3985 } else if (all_reg) { 3986 buf[off++] |= 0x01; 3987 buf[off++] = (pr_res_scope & 0xf0) | 3988 (pr_res_type & 0x0f); 3989 } else { 3990 off += 2; 3991 } 3992 3993 off += 4; /* Skip over reserved area */ 3994 /* 3995 * From spc4r17 6.3.15: 3996 * 3997 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3998 * IDENTIFIER field contains the relative port identifier (see 3999 * 3.1.120) of the target port that is part of the I_T nexus 4000 * described by this full status descriptor. If the ALL_TG_PT 4001 * bit is set to one, the contents of the RELATIVE TARGET PORT 4002 * IDENTIFIER field are not defined by this standard. 4003 */ 4004 if (!pr_reg->pr_reg_all_tg_pt) { 4005 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4006 4007 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4008 buf[off++] = (sep_rtpi & 0xff); 4009 } else 4010 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4011 4012 buf[off+4] = se_tpg->proto_id; 4013 4014 /* 4015 * Now, have the $FABRIC_MOD fill in the transport ID. 4016 */ 4017 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4018 &format_code, &buf[off+4]); 4019 4020 spin_lock(&pr_tmpl->registration_lock); 4021 atomic_dec_mb(&pr_reg->pr_res_holders); 4022 4023 if (desc_len < 0) 4024 break; 4025 /* 4026 * Set the ADDITIONAL DESCRIPTOR LENGTH 4027 */ 4028 buf[off++] = ((desc_len >> 24) & 0xff); 4029 buf[off++] = ((desc_len >> 16) & 0xff); 4030 buf[off++] = ((desc_len >> 8) & 0xff); 4031 buf[off++] = (desc_len & 0xff); 4032 /* 4033 * Size of full desctipor header minus TransportID 4034 * containing $FABRIC_MOD specific) initiator device/port 4035 * WWN information. 4036 * 4037 * See spc4r17 Section 6.13.5 Table 169 4038 */ 4039 add_desc_len = (24 + desc_len); 4040 4041 off += desc_len; 4042 add_len += add_desc_len; 4043 } 4044 spin_unlock(&pr_tmpl->registration_lock); 4045 /* 4046 * Set ADDITIONAL_LENGTH 4047 */ 4048 buf[4] = ((add_len >> 24) & 0xff); 4049 buf[5] = ((add_len >> 16) & 0xff); 4050 buf[6] = ((add_len >> 8) & 0xff); 4051 buf[7] = (add_len & 0xff); 4052 4053 transport_kunmap_data_sg(cmd); 4054 4055 return 0; 4056 } 4057 4058 sense_reason_t 4059 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4060 { 4061 sense_reason_t ret; 4062 4063 /* 4064 * Following spc2r20 5.5.1 Reservations overview: 4065 * 4066 * If a logical unit has been reserved by any RESERVE command and is 4067 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4068 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4069 * initiator or service action and shall terminate with a RESERVATION 4070 * CONFLICT status. 4071 */ 4072 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4073 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4074 " SPC-2 reservation is held, returning" 4075 " RESERVATION_CONFLICT\n"); 4076 return TCM_RESERVATION_CONFLICT; 4077 } 4078 4079 switch (cmd->t_task_cdb[1] & 0x1f) { 4080 case PRI_READ_KEYS: 4081 ret = core_scsi3_pri_read_keys(cmd); 4082 break; 4083 case PRI_READ_RESERVATION: 4084 ret = core_scsi3_pri_read_reservation(cmd); 4085 break; 4086 case PRI_REPORT_CAPABILITIES: 4087 ret = core_scsi3_pri_report_capabilities(cmd); 4088 break; 4089 case PRI_READ_FULL_STATUS: 4090 ret = core_scsi3_pri_read_full_status(cmd); 4091 break; 4092 default: 4093 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4094 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4095 return TCM_INVALID_CDB_FIELD; 4096 } 4097 4098 if (!ret) 4099 target_complete_cmd(cmd, GOOD); 4100 return ret; 4101 } 4102 4103 sense_reason_t 4104 target_check_reservation(struct se_cmd *cmd) 4105 { 4106 struct se_device *dev = cmd->se_dev; 4107 sense_reason_t ret; 4108 4109 if (!cmd->se_sess) 4110 return 0; 4111 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4112 return 0; 4113 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4114 return 0; 4115 4116 spin_lock(&dev->dev_reservation_lock); 4117 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4118 ret = target_scsi2_reservation_check(cmd); 4119 else 4120 ret = target_scsi3_pr_reservation_check(cmd); 4121 spin_unlock(&dev->dev_reservation_lock); 4122 4123 return ret; 4124 } 4125