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_proto.h> 32 #include <asm/unaligned.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_backend.h> 36 #include <target/target_core_fabric.h> 37 #include <target/target_core_configfs.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 int dest_local_nexus; 48 struct t10_pr_registration *dest_pr_reg; 49 struct se_portal_group *dest_tpg; 50 struct se_node_acl *dest_node_acl; 51 struct se_dev_entry *dest_se_deve; 52 struct list_head dest_list; 53 }; 54 55 void core_pr_dump_initiator_port( 56 struct t10_pr_registration *pr_reg, 57 char *buf, 58 u32 size) 59 { 60 if (!pr_reg->isid_present_at_reg) 61 buf[0] = '\0'; 62 63 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 64 } 65 66 enum register_type { 67 REGISTER, 68 REGISTER_AND_IGNORE_EXISTING_KEY, 69 REGISTER_AND_MOVE, 70 }; 71 72 enum preempt_type { 73 PREEMPT, 74 PREEMPT_AND_ABORT, 75 }; 76 77 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 78 struct t10_pr_registration *, int, int); 79 80 static int is_reservation_holder( 81 struct t10_pr_registration *pr_res_holder, 82 struct t10_pr_registration *pr_reg) 83 { 84 int pr_res_type; 85 86 if (pr_res_holder) { 87 pr_res_type = pr_res_holder->pr_res_type; 88 89 return pr_res_holder == pr_reg || 90 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 91 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 92 } 93 return 0; 94 } 95 96 static sense_reason_t 97 target_scsi2_reservation_check(struct se_cmd *cmd) 98 { 99 struct se_device *dev = cmd->se_dev; 100 struct se_session *sess = cmd->se_sess; 101 102 switch (cmd->t_task_cdb[0]) { 103 case INQUIRY: 104 case RELEASE: 105 case RELEASE_10: 106 return 0; 107 default: 108 break; 109 } 110 111 if (!dev->dev_reserved_node_acl || !sess) 112 return 0; 113 114 if (dev->dev_reserved_node_acl != sess->se_node_acl) 115 return TCM_RESERVATION_CONFLICT; 116 117 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 118 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 119 return TCM_RESERVATION_CONFLICT; 120 } 121 122 return 0; 123 } 124 125 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 126 struct se_node_acl *, struct se_session *); 127 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 128 129 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 130 { 131 struct se_session *se_sess = cmd->se_sess; 132 struct se_device *dev = cmd->se_dev; 133 struct t10_pr_registration *pr_reg; 134 struct t10_reservation *pr_tmpl = &dev->t10_pr; 135 int conflict = 0; 136 137 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 138 se_sess); 139 if (pr_reg) { 140 /* 141 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 142 * behavior 143 * 144 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 145 * status, but no reservation shall be established and the 146 * persistent reservation shall not be changed, if the command 147 * is received from a) and b) below. 148 * 149 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 150 * status, but the persistent reservation shall not be released, 151 * if the command is received from a) and b) 152 * 153 * a) An I_T nexus that is a persistent reservation holder; or 154 * b) An I_T nexus that is registered if a registrants only or 155 * all registrants type persistent reservation is present. 156 * 157 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 158 * RELEASE(6) command, or RELEASE(10) command shall be processed 159 * as defined in SPC-2. 160 */ 161 if (pr_reg->pr_res_holder) { 162 core_scsi3_put_pr_reg(pr_reg); 163 return 1; 164 } 165 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 166 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 167 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 168 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 169 core_scsi3_put_pr_reg(pr_reg); 170 return 1; 171 } 172 core_scsi3_put_pr_reg(pr_reg); 173 conflict = 1; 174 } else { 175 /* 176 * Following spc2r20 5.5.1 Reservations overview: 177 * 178 * If a logical unit has executed a PERSISTENT RESERVE OUT 179 * command with the REGISTER or the REGISTER AND IGNORE 180 * EXISTING KEY service action and is still registered by any 181 * initiator, all RESERVE commands and all RELEASE commands 182 * regardless of initiator shall conflict and shall terminate 183 * with a RESERVATION CONFLICT status. 184 */ 185 spin_lock(&pr_tmpl->registration_lock); 186 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 187 spin_unlock(&pr_tmpl->registration_lock); 188 } 189 190 if (conflict) { 191 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 192 " while active SPC-3 registrations exist," 193 " returning RESERVATION_CONFLICT\n"); 194 return -EBUSY; 195 } 196 197 return 0; 198 } 199 200 sense_reason_t 201 target_scsi2_reservation_release(struct se_cmd *cmd) 202 { 203 struct se_device *dev = cmd->se_dev; 204 struct se_session *sess = cmd->se_sess; 205 struct se_portal_group *tpg; 206 int rc; 207 208 if (!sess || !sess->se_tpg) 209 goto out; 210 rc = target_check_scsi2_reservation_conflict(cmd); 211 if (rc == 1) 212 goto out; 213 if (rc < 0) 214 return TCM_RESERVATION_CONFLICT; 215 216 spin_lock(&dev->dev_reservation_lock); 217 if (!dev->dev_reserved_node_acl || !sess) 218 goto out_unlock; 219 220 if (dev->dev_reserved_node_acl != sess->se_node_acl) 221 goto out_unlock; 222 223 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 224 goto out_unlock; 225 226 dev->dev_reserved_node_acl = NULL; 227 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 228 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 229 dev->dev_res_bin_isid = 0; 230 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 231 } 232 tpg = sess->se_tpg; 233 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 234 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 235 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_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: %u %s\n", 280 cmd->se_lun->unpacked_lun, 281 dev->dev_reserved_node_acl->initiatorname); 282 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 283 " from %s \n", cmd->se_lun->unpacked_lun, 284 cmd->se_deve->mapped_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: %u -> MAPPED LUN: %u" 297 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 298 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_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( 317 struct se_cmd *cmd, 318 u32 pr_reg_type) 319 { 320 unsigned char *cdb = cmd->t_task_cdb; 321 struct se_dev_entry *se_deve; 322 struct se_session *se_sess = cmd->se_sess; 323 int other_cdb = 0, ignore_reg; 324 int registered_nexus = 0, ret = 1; /* Conflict by default */ 325 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 326 int we = 0; /* Write Exclusive */ 327 int legacy = 0; /* Act like a legacy device and return 328 * RESERVATION CONFLICT on some CDBs */ 329 330 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 331 /* 332 * Determine if the registration should be ignored due to 333 * non-matching ISIDs in target_scsi3_pr_reservation_check(). 334 */ 335 ignore_reg = (pr_reg_type & 0x80000000); 336 if (ignore_reg) 337 pr_reg_type &= ~0x80000000; 338 339 switch (pr_reg_type) { 340 case PR_TYPE_WRITE_EXCLUSIVE: 341 we = 1; 342 case PR_TYPE_EXCLUSIVE_ACCESS: 343 /* 344 * Some commands are only allowed for the persistent reservation 345 * holder. 346 */ 347 if ((se_deve->def_pr_registered) && !(ignore_reg)) 348 registered_nexus = 1; 349 break; 350 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 351 we = 1; 352 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 353 /* 354 * Some commands are only allowed for registered I_T Nexuses. 355 */ 356 reg_only = 1; 357 if ((se_deve->def_pr_registered) && !(ignore_reg)) 358 registered_nexus = 1; 359 break; 360 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 361 we = 1; 362 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 363 /* 364 * Each registered I_T Nexus is a reservation holder. 365 */ 366 all_reg = 1; 367 if ((se_deve->def_pr_registered) && !(ignore_reg)) 368 registered_nexus = 1; 369 break; 370 default: 371 return -EINVAL; 372 } 373 /* 374 * Referenced from spc4r17 table 45 for *NON* PR holder access 375 */ 376 switch (cdb[0]) { 377 case SECURITY_PROTOCOL_IN: 378 if (registered_nexus) 379 return 0; 380 ret = (we) ? 0 : 1; 381 break; 382 case MODE_SENSE: 383 case MODE_SENSE_10: 384 case READ_ATTRIBUTE: 385 case READ_BUFFER: 386 case RECEIVE_DIAGNOSTIC: 387 if (legacy) { 388 ret = 1; 389 break; 390 } 391 if (registered_nexus) { 392 ret = 0; 393 break; 394 } 395 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 396 break; 397 case PERSISTENT_RESERVE_OUT: 398 /* 399 * This follows PERSISTENT_RESERVE_OUT service actions that 400 * are allowed in the presence of various reservations. 401 * See spc4r17, table 46 402 */ 403 switch (cdb[1] & 0x1f) { 404 case PRO_CLEAR: 405 case PRO_PREEMPT: 406 case PRO_PREEMPT_AND_ABORT: 407 ret = (registered_nexus) ? 0 : 1; 408 break; 409 case PRO_REGISTER: 410 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 411 ret = 0; 412 break; 413 case PRO_REGISTER_AND_MOVE: 414 case PRO_RESERVE: 415 ret = 1; 416 break; 417 case PRO_RELEASE: 418 ret = (registered_nexus) ? 0 : 1; 419 break; 420 default: 421 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 422 " action: 0x%02x\n", cdb[1] & 0x1f); 423 return -EINVAL; 424 } 425 break; 426 case RELEASE: 427 case RELEASE_10: 428 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 429 ret = 0; 430 break; 431 case RESERVE: 432 case RESERVE_10: 433 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 434 ret = 0; 435 break; 436 case TEST_UNIT_READY: 437 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 438 break; 439 case MAINTENANCE_IN: 440 switch (cdb[1] & 0x1f) { 441 case MI_MANAGEMENT_PROTOCOL_IN: 442 if (registered_nexus) { 443 ret = 0; 444 break; 445 } 446 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 447 break; 448 case MI_REPORT_SUPPORTED_OPERATION_CODES: 449 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 450 if (legacy) { 451 ret = 1; 452 break; 453 } 454 if (registered_nexus) { 455 ret = 0; 456 break; 457 } 458 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 459 break; 460 case MI_REPORT_ALIASES: 461 case MI_REPORT_IDENTIFYING_INFORMATION: 462 case MI_REPORT_PRIORITY: 463 case MI_REPORT_TARGET_PGS: 464 case MI_REPORT_TIMESTAMP: 465 ret = 0; /* Allowed */ 466 break; 467 default: 468 pr_err("Unknown MI Service Action: 0x%02x\n", 469 (cdb[1] & 0x1f)); 470 return -EINVAL; 471 } 472 break; 473 case ACCESS_CONTROL_IN: 474 case ACCESS_CONTROL_OUT: 475 case INQUIRY: 476 case LOG_SENSE: 477 case SERVICE_ACTION_IN_12: 478 case REPORT_LUNS: 479 case REQUEST_SENSE: 480 case PERSISTENT_RESERVE_IN: 481 ret = 0; /*/ Allowed CDBs */ 482 break; 483 default: 484 other_cdb = 1; 485 break; 486 } 487 /* 488 * Case where the CDB is explicitly allowed in the above switch 489 * statement. 490 */ 491 if (!ret && !other_cdb) { 492 pr_debug("Allowing explicit CDB: 0x%02x for %s" 493 " reservation holder\n", cdb[0], 494 core_scsi3_pr_dump_type(pr_reg_type)); 495 496 return ret; 497 } 498 /* 499 * Check if write exclusive initiator ports *NOT* holding the 500 * WRITE_EXCLUSIVE_* reservation. 501 */ 502 if (we && !registered_nexus) { 503 if (cmd->data_direction == DMA_TO_DEVICE) { 504 /* 505 * Conflict for write exclusive 506 */ 507 pr_debug("%s Conflict for unregistered nexus" 508 " %s CDB: 0x%02x to %s reservation\n", 509 transport_dump_cmd_direction(cmd), 510 se_sess->se_node_acl->initiatorname, cdb[0], 511 core_scsi3_pr_dump_type(pr_reg_type)); 512 return 1; 513 } else { 514 /* 515 * Allow non WRITE CDBs for all Write Exclusive 516 * PR TYPEs to pass for registered and 517 * non-registered_nexuxes NOT holding the reservation. 518 * 519 * We only make noise for the unregisterd nexuses, 520 * as we expect registered non-reservation holding 521 * nexuses to issue CDBs. 522 */ 523 524 if (!registered_nexus) { 525 pr_debug("Allowing implicit CDB: 0x%02x" 526 " for %s reservation on unregistered" 527 " nexus\n", cdb[0], 528 core_scsi3_pr_dump_type(pr_reg_type)); 529 } 530 531 return 0; 532 } 533 } else if ((reg_only) || (all_reg)) { 534 if (registered_nexus) { 535 /* 536 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 537 * allow commands from registered nexuses. 538 */ 539 540 pr_debug("Allowing implicit CDB: 0x%02x for %s" 541 " reservation\n", cdb[0], 542 core_scsi3_pr_dump_type(pr_reg_type)); 543 544 return 0; 545 } 546 } else if (we && registered_nexus) { 547 /* 548 * Reads are allowed for Write Exclusive locks 549 * from all registrants. 550 */ 551 if (cmd->data_direction == DMA_FROM_DEVICE) { 552 pr_debug("Allowing READ CDB: 0x%02x for %s" 553 " reservation\n", cdb[0], 554 core_scsi3_pr_dump_type(pr_reg_type)); 555 556 return 0; 557 } 558 } 559 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 560 " for %s reservation\n", transport_dump_cmd_direction(cmd), 561 (registered_nexus) ? "" : "un", 562 se_sess->se_node_acl->initiatorname, cdb[0], 563 core_scsi3_pr_dump_type(pr_reg_type)); 564 565 return 1; /* Conflict by default */ 566 } 567 568 static sense_reason_t 569 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 570 { 571 struct se_device *dev = cmd->se_dev; 572 struct se_session *sess = cmd->se_sess; 573 u32 pr_reg_type; 574 575 if (!dev->dev_pr_res_holder) 576 return 0; 577 578 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 579 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 580 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 581 goto check_nonholder; 582 583 if (dev->dev_pr_res_holder->isid_present_at_reg) { 584 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 585 sess->sess_bin_isid) { 586 pr_reg_type |= 0x80000000; 587 goto check_nonholder; 588 } 589 } 590 591 return 0; 592 593 check_nonholder: 594 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type)) 595 return TCM_RESERVATION_CONFLICT; 596 return 0; 597 } 598 599 static u32 core_scsi3_pr_generation(struct se_device *dev) 600 { 601 u32 prg; 602 603 /* 604 * PRGeneration field shall contain the value of a 32-bit wrapping 605 * counter mainted by the device server. 606 * 607 * Note that this is done regardless of Active Persist across 608 * Target PowerLoss (APTPL) 609 * 610 * See spc4r17 section 6.3.12 READ_KEYS service action 611 */ 612 spin_lock(&dev->dev_reservation_lock); 613 prg = dev->t10_pr.pr_generation++; 614 spin_unlock(&dev->dev_reservation_lock); 615 616 return prg; 617 } 618 619 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 620 struct se_device *dev, 621 struct se_node_acl *nacl, 622 struct se_dev_entry *deve, 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 = deve->mapped_lun; 645 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 646 pr_reg->pr_res_key = sa_res_key; 647 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 648 pr_reg->pr_reg_aptpl = aptpl; 649 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 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_dev_entry *deve, 674 unsigned char *isid, 675 u64 sa_res_key, 676 int all_tg_pt, 677 int aptpl) 678 { 679 struct se_dev_entry *deve_tmp; 680 struct se_node_acl *nacl_tmp; 681 struct se_port *port, *port_tmp; 682 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 683 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 684 int ret; 685 /* 686 * Create a registration for the I_T Nexus upon which the 687 * PROUT REGISTER was received. 688 */ 689 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 690 sa_res_key, all_tg_pt, aptpl); 691 if (!pr_reg) 692 return NULL; 693 /* 694 * Return pointer to pr_reg for ALL_TG_PT=0 695 */ 696 if (!all_tg_pt) 697 return pr_reg; 698 /* 699 * Create list of matching SCSI Initiator Port registrations 700 * for ALL_TG_PT=1 701 */ 702 spin_lock(&dev->se_port_lock); 703 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 704 atomic_inc_mb(&port->sep_tg_pt_ref_cnt); 705 spin_unlock(&dev->se_port_lock); 706 707 spin_lock_bh(&port->sep_alua_lock); 708 list_for_each_entry(deve_tmp, &port->sep_alua_list, 709 alua_port_list) { 710 /* 711 * This pointer will be NULL for demo mode MappedLUNs 712 * that have not been make explicit via a ConfigFS 713 * MappedLUN group for the SCSI Initiator Node ACL. 714 */ 715 if (!deve_tmp->se_lun_acl) 716 continue; 717 718 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 719 /* 720 * Skip the matching struct se_node_acl that is allocated 721 * above.. 722 */ 723 if (nacl == nacl_tmp) 724 continue; 725 /* 726 * Only perform PR registrations for target ports on 727 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 728 * arrived. 729 */ 730 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 731 continue; 732 /* 733 * Look for a matching Initiator Node ACL in ASCII format 734 */ 735 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 736 continue; 737 738 atomic_inc_mb(&deve_tmp->pr_ref_count); 739 spin_unlock_bh(&port->sep_alua_lock); 740 /* 741 * Grab a configfs group dependency that is released 742 * for the exception path at label out: below, or upon 743 * completion of adding ALL_TG_PT=1 registrations in 744 * __core_scsi3_add_registration() 745 */ 746 ret = core_scsi3_lunacl_depend_item(deve_tmp); 747 if (ret < 0) { 748 pr_err("core_scsi3_lunacl_depend" 749 "_item() failed\n"); 750 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 751 atomic_dec_mb(&deve_tmp->pr_ref_count); 752 goto out; 753 } 754 /* 755 * Located a matching SCSI Initiator Port on a different 756 * port, allocate the pr_reg_atp and attach it to the 757 * pr_reg->pr_reg_atp_list that will be processed once 758 * the original *pr_reg is processed in 759 * __core_scsi3_add_registration() 760 */ 761 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 762 nacl_tmp, deve_tmp, NULL, 763 sa_res_key, all_tg_pt, aptpl); 764 if (!pr_reg_atp) { 765 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 766 atomic_dec_mb(&deve_tmp->pr_ref_count); 767 core_scsi3_lunacl_undepend_item(deve_tmp); 768 goto out; 769 } 770 771 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 772 &pr_reg->pr_reg_atp_list); 773 spin_lock_bh(&port->sep_alua_lock); 774 } 775 spin_unlock_bh(&port->sep_alua_lock); 776 777 spin_lock(&dev->se_port_lock); 778 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 779 } 780 spin_unlock(&dev->se_port_lock); 781 782 return pr_reg; 783 out: 784 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 785 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 786 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 787 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 788 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 789 } 790 kmem_cache_free(t10_pr_reg_cache, pr_reg); 791 return NULL; 792 } 793 794 int core_scsi3_alloc_aptpl_registration( 795 struct t10_reservation *pr_tmpl, 796 u64 sa_res_key, 797 unsigned char *i_port, 798 unsigned char *isid, 799 u32 mapped_lun, 800 unsigned char *t_port, 801 u16 tpgt, 802 u32 target_lun, 803 int res_holder, 804 int all_tg_pt, 805 u8 type) 806 { 807 struct t10_pr_registration *pr_reg; 808 809 if (!i_port || !t_port || !sa_res_key) { 810 pr_err("Illegal parameters for APTPL registration\n"); 811 return -EINVAL; 812 } 813 814 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 815 if (!pr_reg) { 816 pr_err("Unable to allocate struct t10_pr_registration\n"); 817 return -ENOMEM; 818 } 819 820 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 821 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 822 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 823 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 824 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 825 atomic_set(&pr_reg->pr_res_holders, 0); 826 pr_reg->pr_reg_nacl = NULL; 827 pr_reg->pr_reg_deve = NULL; 828 pr_reg->pr_res_mapped_lun = mapped_lun; 829 pr_reg->pr_aptpl_target_lun = target_lun; 830 pr_reg->pr_res_key = sa_res_key; 831 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 832 pr_reg->pr_reg_aptpl = 1; 833 pr_reg->pr_reg_tg_pt_lun = NULL; 834 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 835 pr_reg->pr_res_type = type; 836 /* 837 * If an ISID value had been saved in APTPL metadata for this 838 * SCSI Initiator Port, restore it now. 839 */ 840 if (isid != NULL) { 841 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 842 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 843 pr_reg->isid_present_at_reg = 1; 844 } 845 /* 846 * Copy the i_port and t_port information from caller. 847 */ 848 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 849 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 850 pr_reg->pr_reg_tpgt = tpgt; 851 /* 852 * Set pr_res_holder from caller, the pr_reg who is the reservation 853 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 854 * the Initiator Node LUN ACL from the fabric module is created for 855 * this registration. 856 */ 857 pr_reg->pr_res_holder = res_holder; 858 859 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 860 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 861 " metadata\n", (res_holder) ? "+reservation" : ""); 862 return 0; 863 } 864 865 static void core_scsi3_aptpl_reserve( 866 struct se_device *dev, 867 struct se_portal_group *tpg, 868 struct se_node_acl *node_acl, 869 struct t10_pr_registration *pr_reg) 870 { 871 char i_buf[PR_REG_ISID_ID_LEN]; 872 873 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 874 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 875 876 spin_lock(&dev->dev_reservation_lock); 877 dev->dev_pr_res_holder = pr_reg; 878 spin_unlock(&dev->dev_reservation_lock); 879 880 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 881 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 882 tpg->se_tpg_tfo->get_fabric_name(), 883 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 884 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 885 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 886 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 887 i_buf); 888 } 889 890 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 891 struct t10_pr_registration *, enum register_type, int); 892 893 static int __core_scsi3_check_aptpl_registration( 894 struct se_device *dev, 895 struct se_portal_group *tpg, 896 struct se_lun *lun, 897 u32 target_lun, 898 struct se_node_acl *nacl, 899 struct se_dev_entry *deve) 900 { 901 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 902 struct t10_reservation *pr_tmpl = &dev->t10_pr; 903 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 904 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 905 u16 tpgt; 906 907 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 908 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 909 /* 910 * Copy Initiator Port information from struct se_node_acl 911 */ 912 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 913 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 914 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 915 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 916 /* 917 * Look for the matching registrations+reservation from those 918 * created from APTPL metadata. Note that multiple registrations 919 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 920 * TransportIDs. 921 */ 922 spin_lock(&pr_tmpl->aptpl_reg_lock); 923 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 924 pr_reg_aptpl_list) { 925 926 if (!strcmp(pr_reg->pr_iport, i_port) && 927 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 928 !(strcmp(pr_reg->pr_tport, t_port)) && 929 (pr_reg->pr_reg_tpgt == tpgt) && 930 (pr_reg->pr_aptpl_target_lun == target_lun)) { 931 932 pr_reg->pr_reg_nacl = nacl; 933 pr_reg->pr_reg_deve = deve; 934 pr_reg->pr_reg_tg_pt_lun = lun; 935 936 list_del(&pr_reg->pr_reg_aptpl_list); 937 spin_unlock(&pr_tmpl->aptpl_reg_lock); 938 /* 939 * At this point all of the pointers in *pr_reg will 940 * be setup, so go ahead and add the registration. 941 */ 942 943 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 944 /* 945 * If this registration is the reservation holder, 946 * make that happen now.. 947 */ 948 if (pr_reg->pr_res_holder) 949 core_scsi3_aptpl_reserve(dev, tpg, 950 nacl, pr_reg); 951 /* 952 * Reenable pr_aptpl_active to accept new metadata 953 * updates once the SCSI device is active again.. 954 */ 955 spin_lock(&pr_tmpl->aptpl_reg_lock); 956 pr_tmpl->pr_aptpl_active = 1; 957 } 958 } 959 spin_unlock(&pr_tmpl->aptpl_reg_lock); 960 961 return 0; 962 } 963 964 int core_scsi3_check_aptpl_registration( 965 struct se_device *dev, 966 struct se_portal_group *tpg, 967 struct se_lun *lun, 968 struct se_node_acl *nacl, 969 u32 mapped_lun) 970 { 971 struct se_dev_entry *deve = nacl->device_list[mapped_lun]; 972 973 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 974 return 0; 975 976 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 977 lun->unpacked_lun, nacl, deve); 978 } 979 980 static void __core_scsi3_dump_registration( 981 const struct target_core_fabric_ops *tfo, 982 struct se_device *dev, 983 struct se_node_acl *nacl, 984 struct t10_pr_registration *pr_reg, 985 enum register_type register_type) 986 { 987 struct se_portal_group *se_tpg = nacl->se_tpg; 988 char i_buf[PR_REG_ISID_ID_LEN]; 989 990 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 991 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 992 993 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 994 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 995 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 996 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 997 i_buf); 998 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 999 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1000 tfo->tpg_get_tag(se_tpg)); 1001 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1002 " Port(s)\n", tfo->get_fabric_name(), 1003 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1004 dev->transport->name); 1005 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1006 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1007 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1008 pr_reg->pr_reg_aptpl); 1009 } 1010 1011 /* 1012 * this function can be called with struct se_device->dev_reservation_lock 1013 * when register_move = 1 1014 */ 1015 static void __core_scsi3_add_registration( 1016 struct se_device *dev, 1017 struct se_node_acl *nacl, 1018 struct t10_pr_registration *pr_reg, 1019 enum register_type register_type, 1020 int register_move) 1021 { 1022 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1023 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1024 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1025 1026 /* 1027 * Increment PRgeneration counter for struct se_device upon a successful 1028 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1029 * 1030 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1031 * action, the struct se_device->dev_reservation_lock will already be held, 1032 * so we do not call core_scsi3_pr_generation() which grabs the lock 1033 * for the REGISTER. 1034 */ 1035 pr_reg->pr_res_generation = (register_move) ? 1036 dev->t10_pr.pr_generation++ : 1037 core_scsi3_pr_generation(dev); 1038 1039 spin_lock(&pr_tmpl->registration_lock); 1040 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1041 pr_reg->pr_reg_deve->def_pr_registered = 1; 1042 1043 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1044 spin_unlock(&pr_tmpl->registration_lock); 1045 /* 1046 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1047 */ 1048 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1049 return; 1050 /* 1051 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1052 * allocated in __core_scsi3_alloc_registration() 1053 */ 1054 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1055 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1056 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1057 1058 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1059 1060 spin_lock(&pr_tmpl->registration_lock); 1061 list_add_tail(&pr_reg_tmp->pr_reg_list, 1062 &pr_tmpl->registration_list); 1063 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1064 1065 __core_scsi3_dump_registration(tfo, dev, 1066 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1067 register_type); 1068 spin_unlock(&pr_tmpl->registration_lock); 1069 /* 1070 * Drop configfs group dependency reference from 1071 * __core_scsi3_alloc_registration() 1072 */ 1073 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1074 } 1075 } 1076 1077 static int core_scsi3_alloc_registration( 1078 struct se_device *dev, 1079 struct se_node_acl *nacl, 1080 struct se_dev_entry *deve, 1081 unsigned char *isid, 1082 u64 sa_res_key, 1083 int all_tg_pt, 1084 int aptpl, 1085 enum register_type register_type, 1086 int register_move) 1087 { 1088 struct t10_pr_registration *pr_reg; 1089 1090 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1091 sa_res_key, all_tg_pt, aptpl); 1092 if (!pr_reg) 1093 return -EPERM; 1094 1095 __core_scsi3_add_registration(dev, nacl, pr_reg, 1096 register_type, register_move); 1097 return 0; 1098 } 1099 1100 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1101 struct se_device *dev, 1102 struct se_node_acl *nacl, 1103 unsigned char *isid) 1104 { 1105 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1106 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1107 struct se_portal_group *tpg; 1108 1109 spin_lock(&pr_tmpl->registration_lock); 1110 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1111 &pr_tmpl->registration_list, pr_reg_list) { 1112 /* 1113 * First look for a matching struct se_node_acl 1114 */ 1115 if (pr_reg->pr_reg_nacl != nacl) 1116 continue; 1117 1118 tpg = pr_reg->pr_reg_nacl->se_tpg; 1119 /* 1120 * If this registration does NOT contain a fabric provided 1121 * ISID, then we have found a match. 1122 */ 1123 if (!pr_reg->isid_present_at_reg) { 1124 /* 1125 * Determine if this SCSI device server requires that 1126 * SCSI Intiatior TransportID w/ ISIDs is enforced 1127 * for fabric modules (iSCSI) requiring them. 1128 */ 1129 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1130 if (dev->dev_attrib.enforce_pr_isids) 1131 continue; 1132 } 1133 atomic_inc_mb(&pr_reg->pr_res_holders); 1134 spin_unlock(&pr_tmpl->registration_lock); 1135 return pr_reg; 1136 } 1137 /* 1138 * If the *pr_reg contains a fabric defined ISID for multi-value 1139 * SCSI Initiator Port TransportIDs, then we expect a valid 1140 * matching ISID to be provided by the local SCSI Initiator Port. 1141 */ 1142 if (!isid) 1143 continue; 1144 if (strcmp(isid, pr_reg->pr_reg_isid)) 1145 continue; 1146 1147 atomic_inc_mb(&pr_reg->pr_res_holders); 1148 spin_unlock(&pr_tmpl->registration_lock); 1149 return pr_reg; 1150 } 1151 spin_unlock(&pr_tmpl->registration_lock); 1152 1153 return NULL; 1154 } 1155 1156 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1157 struct se_device *dev, 1158 struct se_node_acl *nacl, 1159 struct se_session *sess) 1160 { 1161 struct se_portal_group *tpg = nacl->se_tpg; 1162 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1163 1164 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1165 memset(&buf[0], 0, PR_REG_ISID_LEN); 1166 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1167 PR_REG_ISID_LEN); 1168 isid_ptr = &buf[0]; 1169 } 1170 1171 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1172 } 1173 1174 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1175 { 1176 atomic_dec_mb(&pr_reg->pr_res_holders); 1177 } 1178 1179 static int core_scsi3_check_implicit_release( 1180 struct se_device *dev, 1181 struct t10_pr_registration *pr_reg) 1182 { 1183 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1184 struct t10_pr_registration *pr_res_holder; 1185 int ret = 0; 1186 1187 spin_lock(&dev->dev_reservation_lock); 1188 pr_res_holder = dev->dev_pr_res_holder; 1189 if (!pr_res_holder) { 1190 spin_unlock(&dev->dev_reservation_lock); 1191 return ret; 1192 } 1193 if (pr_res_holder == pr_reg) { 1194 /* 1195 * Perform an implicit RELEASE if the registration that 1196 * is being released is holding the reservation. 1197 * 1198 * From spc4r17, section 5.7.11.1: 1199 * 1200 * e) If the I_T nexus is the persistent reservation holder 1201 * and the persistent reservation is not an all registrants 1202 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1203 * service action or REGISTER AND IGNORE EXISTING KEY 1204 * service action with the SERVICE ACTION RESERVATION KEY 1205 * field set to zero (see 5.7.11.3). 1206 */ 1207 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1208 ret = 1; 1209 /* 1210 * For 'All Registrants' reservation types, all existing 1211 * registrations are still processed as reservation holders 1212 * in core_scsi3_pr_seq_non_holder() after the initial 1213 * reservation holder is implicitly released here. 1214 */ 1215 } else if (pr_reg->pr_reg_all_tg_pt && 1216 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1217 pr_reg->pr_reg_nacl->initiatorname)) && 1218 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1219 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1220 " UNREGISTER while existing reservation with matching" 1221 " key 0x%016Lx is present from another SCSI Initiator" 1222 " Port\n", pr_reg->pr_res_key); 1223 ret = -EPERM; 1224 } 1225 spin_unlock(&dev->dev_reservation_lock); 1226 1227 return ret; 1228 } 1229 1230 /* 1231 * Called with struct t10_reservation->registration_lock held. 1232 */ 1233 static void __core_scsi3_free_registration( 1234 struct se_device *dev, 1235 struct t10_pr_registration *pr_reg, 1236 struct list_head *preempt_and_abort_list, 1237 int dec_holders) 1238 __releases(&pr_tmpl->registration_lock) 1239 __acquires(&pr_tmpl->registration_lock) 1240 { 1241 const struct target_core_fabric_ops *tfo = 1242 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1243 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1244 char i_buf[PR_REG_ISID_ID_LEN]; 1245 1246 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1247 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1248 1249 pr_reg->pr_reg_deve->def_pr_registered = 0; 1250 pr_reg->pr_reg_deve->pr_res_key = 0; 1251 if (!list_empty(&pr_reg->pr_reg_list)) 1252 list_del(&pr_reg->pr_reg_list); 1253 /* 1254 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1255 * so call core_scsi3_put_pr_reg() to decrement our reference. 1256 */ 1257 if (dec_holders) 1258 core_scsi3_put_pr_reg(pr_reg); 1259 /* 1260 * Wait until all reference from any other I_T nexuses for this 1261 * *pr_reg have been released. Because list_del() is called above, 1262 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1263 * count back to zero, and we release *pr_reg. 1264 */ 1265 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1266 spin_unlock(&pr_tmpl->registration_lock); 1267 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1268 tfo->get_fabric_name()); 1269 cpu_relax(); 1270 spin_lock(&pr_tmpl->registration_lock); 1271 } 1272 1273 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1274 " Node: %s%s\n", tfo->get_fabric_name(), 1275 pr_reg->pr_reg_nacl->initiatorname, 1276 i_buf); 1277 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1278 " Port(s)\n", tfo->get_fabric_name(), 1279 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1280 dev->transport->name); 1281 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1282 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1283 pr_reg->pr_res_generation); 1284 1285 if (!preempt_and_abort_list) { 1286 pr_reg->pr_reg_deve = NULL; 1287 pr_reg->pr_reg_nacl = NULL; 1288 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1289 return; 1290 } 1291 /* 1292 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1293 * are released once the ABORT_TASK_SET has completed.. 1294 */ 1295 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1296 } 1297 1298 void core_scsi3_free_pr_reg_from_nacl( 1299 struct se_device *dev, 1300 struct se_node_acl *nacl) 1301 { 1302 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1303 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1304 bool free_reg = false; 1305 /* 1306 * If the passed se_node_acl matches the reservation holder, 1307 * release the reservation. 1308 */ 1309 spin_lock(&dev->dev_reservation_lock); 1310 pr_res_holder = dev->dev_pr_res_holder; 1311 if ((pr_res_holder != NULL) && 1312 (pr_res_holder->pr_reg_nacl == nacl)) { 1313 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1314 free_reg = true; 1315 } 1316 spin_unlock(&dev->dev_reservation_lock); 1317 /* 1318 * Release any registration associated with the struct se_node_acl. 1319 */ 1320 spin_lock(&pr_tmpl->registration_lock); 1321 if (pr_res_holder && free_reg) 1322 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1323 1324 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1325 &pr_tmpl->registration_list, pr_reg_list) { 1326 1327 if (pr_reg->pr_reg_nacl != nacl) 1328 continue; 1329 1330 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1331 } 1332 spin_unlock(&pr_tmpl->registration_lock); 1333 } 1334 1335 void core_scsi3_free_all_registrations( 1336 struct se_device *dev) 1337 { 1338 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1339 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1340 1341 spin_lock(&dev->dev_reservation_lock); 1342 pr_res_holder = dev->dev_pr_res_holder; 1343 if (pr_res_holder != NULL) { 1344 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1345 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1346 pr_res_holder, 0, 0); 1347 } 1348 spin_unlock(&dev->dev_reservation_lock); 1349 1350 spin_lock(&pr_tmpl->registration_lock); 1351 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1352 &pr_tmpl->registration_list, pr_reg_list) { 1353 1354 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1355 } 1356 spin_unlock(&pr_tmpl->registration_lock); 1357 1358 spin_lock(&pr_tmpl->aptpl_reg_lock); 1359 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1360 pr_reg_aptpl_list) { 1361 list_del(&pr_reg->pr_reg_aptpl_list); 1362 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1363 } 1364 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1365 } 1366 1367 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1368 { 1369 return target_depend_item(&tpg->tpg_group.cg_item); 1370 } 1371 1372 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1373 { 1374 target_undepend_item(&tpg->tpg_group.cg_item); 1375 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1376 } 1377 1378 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1379 { 1380 if (nacl->dynamic_node_acl) 1381 return 0; 1382 return target_depend_item(&nacl->acl_group.cg_item); 1383 } 1384 1385 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1386 { 1387 if (!nacl->dynamic_node_acl) 1388 target_undepend_item(&nacl->acl_group.cg_item); 1389 atomic_dec_mb(&nacl->acl_pr_ref_count); 1390 } 1391 1392 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1393 { 1394 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1395 struct se_node_acl *nacl; 1396 struct se_portal_group *tpg; 1397 /* 1398 * For nacl->dynamic_node_acl=1 1399 */ 1400 if (!lun_acl) 1401 return 0; 1402 1403 nacl = lun_acl->se_lun_nacl; 1404 tpg = nacl->se_tpg; 1405 1406 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1407 } 1408 1409 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1410 { 1411 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1412 struct se_node_acl *nacl; 1413 struct se_portal_group *tpg; 1414 /* 1415 * For nacl->dynamic_node_acl=1 1416 */ 1417 if (!lun_acl) { 1418 atomic_dec_mb(&se_deve->pr_ref_count); 1419 return; 1420 } 1421 nacl = lun_acl->se_lun_nacl; 1422 tpg = nacl->se_tpg; 1423 1424 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1425 atomic_dec_mb(&se_deve->pr_ref_count); 1426 } 1427 1428 static sense_reason_t 1429 core_scsi3_decode_spec_i_port( 1430 struct se_cmd *cmd, 1431 struct se_portal_group *tpg, 1432 unsigned char *l_isid, 1433 u64 sa_res_key, 1434 int all_tg_pt, 1435 int aptpl) 1436 { 1437 struct se_device *dev = cmd->se_dev; 1438 struct se_port *tmp_port; 1439 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1440 struct se_session *se_sess = cmd->se_sess; 1441 struct se_node_acl *dest_node_acl = NULL; 1442 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1443 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1444 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1445 LIST_HEAD(tid_dest_list); 1446 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1447 const struct target_core_fabric_ops *tmp_tf_ops; 1448 unsigned char *buf; 1449 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1450 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1451 sense_reason_t ret; 1452 u32 tpdl, tid_len = 0; 1453 int dest_local_nexus; 1454 u32 dest_rtpi = 0; 1455 1456 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1457 /* 1458 * Allocate a struct pr_transport_id_holder and setup the 1459 * local_node_acl and local_se_deve pointers and add to 1460 * struct list_head tid_dest_list for add registration 1461 * processing in the loop of tid_dest_list below. 1462 */ 1463 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1464 if (!tidh_new) { 1465 pr_err("Unable to allocate tidh_new\n"); 1466 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1467 } 1468 INIT_LIST_HEAD(&tidh_new->dest_list); 1469 tidh_new->dest_tpg = tpg; 1470 tidh_new->dest_node_acl = se_sess->se_node_acl; 1471 tidh_new->dest_se_deve = local_se_deve; 1472 1473 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1474 se_sess->se_node_acl, local_se_deve, l_isid, 1475 sa_res_key, all_tg_pt, aptpl); 1476 if (!local_pr_reg) { 1477 kfree(tidh_new); 1478 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1479 } 1480 tidh_new->dest_pr_reg = local_pr_reg; 1481 /* 1482 * The local I_T nexus does not hold any configfs dependances, 1483 * so we set tid_h->dest_local_nexus=1 to prevent the 1484 * configfs_undepend_item() calls in the tid_dest_list loops below. 1485 */ 1486 tidh_new->dest_local_nexus = 1; 1487 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1488 1489 if (cmd->data_length < 28) { 1490 pr_warn("SPC-PR: Received PR OUT parameter list" 1491 " length too small: %u\n", cmd->data_length); 1492 ret = TCM_INVALID_PARAMETER_LIST; 1493 goto out; 1494 } 1495 1496 buf = transport_kmap_data_sg(cmd); 1497 if (!buf) { 1498 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1499 goto out; 1500 } 1501 1502 /* 1503 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1504 * first extract TransportID Parameter Data Length, and make sure 1505 * the value matches up to the SCSI expected data transfer length. 1506 */ 1507 tpdl = (buf[24] & 0xff) << 24; 1508 tpdl |= (buf[25] & 0xff) << 16; 1509 tpdl |= (buf[26] & 0xff) << 8; 1510 tpdl |= buf[27] & 0xff; 1511 1512 if ((tpdl + 28) != cmd->data_length) { 1513 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1514 " does not equal CDB data_length: %u\n", tpdl, 1515 cmd->data_length); 1516 ret = TCM_INVALID_PARAMETER_LIST; 1517 goto out_unmap; 1518 } 1519 /* 1520 * Start processing the received transport IDs using the 1521 * receiving I_T Nexus portal's fabric dependent methods to 1522 * obtain the SCSI Initiator Port/Device Identifiers. 1523 */ 1524 ptr = &buf[28]; 1525 1526 while (tpdl > 0) { 1527 proto_ident = (ptr[0] & 0x0f); 1528 dest_tpg = NULL; 1529 1530 spin_lock(&dev->se_port_lock); 1531 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1532 tmp_tpg = tmp_port->sep_tpg; 1533 if (!tmp_tpg) 1534 continue; 1535 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1536 if (!tmp_tf_ops) 1537 continue; 1538 if (!tmp_tf_ops->get_fabric_proto_ident || 1539 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1540 continue; 1541 /* 1542 * Look for the matching proto_ident provided by 1543 * the received TransportID 1544 */ 1545 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1546 if (tmp_proto_ident != proto_ident) 1547 continue; 1548 dest_rtpi = tmp_port->sep_rtpi; 1549 1550 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1551 tmp_tpg, (const char *)ptr, &tid_len, 1552 &iport_ptr); 1553 if (!i_str) 1554 continue; 1555 1556 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1557 spin_unlock(&dev->se_port_lock); 1558 1559 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1560 pr_err(" core_scsi3_tpg_depend_item()" 1561 " for tmp_tpg\n"); 1562 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1563 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1564 goto out_unmap; 1565 } 1566 /* 1567 * Locate the destination initiator ACL to be registered 1568 * from the decoded fabric module specific TransportID 1569 * at *i_str. 1570 */ 1571 spin_lock_irq(&tmp_tpg->acl_node_lock); 1572 dest_node_acl = __core_tpg_get_initiator_node_acl( 1573 tmp_tpg, i_str); 1574 if (dest_node_acl) 1575 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1576 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1577 1578 if (!dest_node_acl) { 1579 core_scsi3_tpg_undepend_item(tmp_tpg); 1580 spin_lock(&dev->se_port_lock); 1581 continue; 1582 } 1583 1584 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1585 pr_err("configfs_depend_item() failed" 1586 " for dest_node_acl->acl_group\n"); 1587 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1588 core_scsi3_tpg_undepend_item(tmp_tpg); 1589 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1590 goto out_unmap; 1591 } 1592 1593 dest_tpg = tmp_tpg; 1594 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1595 " %s Port RTPI: %hu\n", 1596 dest_tpg->se_tpg_tfo->get_fabric_name(), 1597 dest_node_acl->initiatorname, dest_rtpi); 1598 1599 spin_lock(&dev->se_port_lock); 1600 break; 1601 } 1602 spin_unlock(&dev->se_port_lock); 1603 1604 if (!dest_tpg) { 1605 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1606 " dest_tpg\n"); 1607 ret = TCM_INVALID_PARAMETER_LIST; 1608 goto out_unmap; 1609 } 1610 1611 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1612 " tid_len: %d for %s + %s\n", 1613 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1614 tpdl, tid_len, i_str, iport_ptr); 1615 1616 if (tid_len > tpdl) { 1617 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1618 " %u for Transport ID: %s\n", tid_len, ptr); 1619 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1620 core_scsi3_tpg_undepend_item(dest_tpg); 1621 ret = TCM_INVALID_PARAMETER_LIST; 1622 goto out_unmap; 1623 } 1624 /* 1625 * Locate the desintation struct se_dev_entry pointer for matching 1626 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1627 * Target Port. 1628 */ 1629 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1630 dest_rtpi); 1631 if (!dest_se_deve) { 1632 pr_err("Unable to locate %s dest_se_deve" 1633 " from destination RTPI: %hu\n", 1634 dest_tpg->se_tpg_tfo->get_fabric_name(), 1635 dest_rtpi); 1636 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 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1644 pr_err("core_scsi3_lunacl_depend_item()" 1645 " failed\n"); 1646 atomic_dec_mb(&dest_se_deve->pr_ref_count); 1647 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1648 core_scsi3_tpg_undepend_item(dest_tpg); 1649 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1650 goto out_unmap; 1651 } 1652 1653 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1654 " dest_se_deve mapped_lun: %u\n", 1655 dest_tpg->se_tpg_tfo->get_fabric_name(), 1656 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1657 1658 /* 1659 * Skip any TransportIDs that already have a registration for 1660 * this target port. 1661 */ 1662 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1663 iport_ptr); 1664 if (pr_reg_e) { 1665 core_scsi3_put_pr_reg(pr_reg_e); 1666 core_scsi3_lunacl_undepend_item(dest_se_deve); 1667 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1668 core_scsi3_tpg_undepend_item(dest_tpg); 1669 ptr += tid_len; 1670 tpdl -= tid_len; 1671 tid_len = 0; 1672 continue; 1673 } 1674 /* 1675 * Allocate a struct pr_transport_id_holder and setup 1676 * the dest_node_acl and dest_se_deve pointers for the 1677 * loop below. 1678 */ 1679 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1680 GFP_KERNEL); 1681 if (!tidh_new) { 1682 pr_err("Unable to allocate tidh_new\n"); 1683 core_scsi3_lunacl_undepend_item(dest_se_deve); 1684 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1685 core_scsi3_tpg_undepend_item(dest_tpg); 1686 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1687 goto out_unmap; 1688 } 1689 INIT_LIST_HEAD(&tidh_new->dest_list); 1690 tidh_new->dest_tpg = dest_tpg; 1691 tidh_new->dest_node_acl = dest_node_acl; 1692 tidh_new->dest_se_deve = dest_se_deve; 1693 1694 /* 1695 * Allocate, but do NOT add the registration for the 1696 * TransportID referenced SCSI Initiator port. This 1697 * done because of the following from spc4r17 in section 1698 * 6.14.3 wrt SPEC_I_PT: 1699 * 1700 * "If a registration fails for any initiator port (e.g., if th 1701 * logical unit does not have enough resources available to 1702 * hold the registration information), no registrations shall be 1703 * made, and the command shall be terminated with 1704 * CHECK CONDITION status." 1705 * 1706 * That means we call __core_scsi3_alloc_registration() here, 1707 * and then call __core_scsi3_add_registration() in the 1708 * 2nd loop which will never fail. 1709 */ 1710 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1711 dest_node_acl, dest_se_deve, iport_ptr, 1712 sa_res_key, all_tg_pt, aptpl); 1713 if (!dest_pr_reg) { 1714 core_scsi3_lunacl_undepend_item(dest_se_deve); 1715 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1716 core_scsi3_tpg_undepend_item(dest_tpg); 1717 kfree(tidh_new); 1718 ret = TCM_INVALID_PARAMETER_LIST; 1719 goto out_unmap; 1720 } 1721 tidh_new->dest_pr_reg = dest_pr_reg; 1722 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1723 1724 ptr += tid_len; 1725 tpdl -= tid_len; 1726 tid_len = 0; 1727 1728 } 1729 1730 transport_kunmap_data_sg(cmd); 1731 1732 /* 1733 * Go ahead and create a registrations from tid_dest_list for the 1734 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1735 * and dest_se_deve. 1736 * 1737 * The SA Reservation Key from the PROUT is set for the 1738 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1739 * means that the TransportID Initiator port will be 1740 * registered on all of the target ports in the SCSI target device 1741 * ALL_TG_PT=0 means the registration will only be for the 1742 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1743 * was received. 1744 */ 1745 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1746 dest_tpg = tidh->dest_tpg; 1747 dest_node_acl = tidh->dest_node_acl; 1748 dest_se_deve = tidh->dest_se_deve; 1749 dest_pr_reg = tidh->dest_pr_reg; 1750 dest_local_nexus = tidh->dest_local_nexus; 1751 1752 list_del(&tidh->dest_list); 1753 kfree(tidh); 1754 1755 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1756 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1757 1758 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1759 dest_pr_reg, 0, 0); 1760 1761 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1762 " registered Transport ID for Node: %s%s Mapped LUN:" 1763 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1764 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun); 1765 1766 if (dest_local_nexus) 1767 continue; 1768 1769 core_scsi3_lunacl_undepend_item(dest_se_deve); 1770 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1771 core_scsi3_tpg_undepend_item(dest_tpg); 1772 } 1773 1774 return 0; 1775 out_unmap: 1776 transport_kunmap_data_sg(cmd); 1777 out: 1778 /* 1779 * For the failure case, release everything from tid_dest_list 1780 * including *dest_pr_reg and the configfs dependances.. 1781 */ 1782 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1783 dest_tpg = tidh->dest_tpg; 1784 dest_node_acl = tidh->dest_node_acl; 1785 dest_se_deve = tidh->dest_se_deve; 1786 dest_pr_reg = tidh->dest_pr_reg; 1787 dest_local_nexus = tidh->dest_local_nexus; 1788 1789 list_del(&tidh->dest_list); 1790 kfree(tidh); 1791 /* 1792 * Release any extra ALL_TG_PT=1 registrations for 1793 * the SPEC_I_PT=1 case. 1794 */ 1795 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1796 &dest_pr_reg->pr_reg_atp_list, 1797 pr_reg_atp_mem_list) { 1798 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1799 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1800 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1801 } 1802 1803 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1804 1805 if (dest_local_nexus) 1806 continue; 1807 1808 core_scsi3_lunacl_undepend_item(dest_se_deve); 1809 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1810 core_scsi3_tpg_undepend_item(dest_tpg); 1811 } 1812 return ret; 1813 } 1814 1815 static int core_scsi3_update_aptpl_buf( 1816 struct se_device *dev, 1817 unsigned char *buf, 1818 u32 pr_aptpl_buf_len) 1819 { 1820 struct se_lun *lun; 1821 struct se_portal_group *tpg; 1822 struct t10_pr_registration *pr_reg; 1823 unsigned char tmp[512], isid_buf[32]; 1824 ssize_t len = 0; 1825 int reg_count = 0; 1826 int ret = 0; 1827 1828 spin_lock(&dev->dev_reservation_lock); 1829 spin_lock(&dev->t10_pr.registration_lock); 1830 /* 1831 * Walk the registration list.. 1832 */ 1833 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1834 pr_reg_list) { 1835 1836 tmp[0] = '\0'; 1837 isid_buf[0] = '\0'; 1838 tpg = pr_reg->pr_reg_nacl->se_tpg; 1839 lun = pr_reg->pr_reg_tg_pt_lun; 1840 /* 1841 * Write out any ISID value to APTPL metadata that was included 1842 * in the original registration. 1843 */ 1844 if (pr_reg->isid_present_at_reg) 1845 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1846 pr_reg->pr_reg_isid); 1847 /* 1848 * Include special metadata if the pr_reg matches the 1849 * reservation holder. 1850 */ 1851 if (dev->dev_pr_res_holder == pr_reg) { 1852 snprintf(tmp, 512, "PR_REG_START: %d" 1853 "\ninitiator_fabric=%s\n" 1854 "initiator_node=%s\n%s" 1855 "sa_res_key=%llu\n" 1856 "res_holder=1\nres_type=%02x\n" 1857 "res_scope=%02x\nres_all_tg_pt=%d\n" 1858 "mapped_lun=%u\n", reg_count, 1859 tpg->se_tpg_tfo->get_fabric_name(), 1860 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1861 pr_reg->pr_res_key, pr_reg->pr_res_type, 1862 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1863 pr_reg->pr_res_mapped_lun); 1864 } else { 1865 snprintf(tmp, 512, "PR_REG_START: %d\n" 1866 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1867 "sa_res_key=%llu\nres_holder=0\n" 1868 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1869 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1870 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1871 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1872 pr_reg->pr_res_mapped_lun); 1873 } 1874 1875 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1876 pr_err("Unable to update renaming APTPL metadata," 1877 " reallocating larger buffer\n"); 1878 ret = -EMSGSIZE; 1879 goto out; 1880 } 1881 len += sprintf(buf+len, "%s", tmp); 1882 1883 /* 1884 * Include information about the associated SCSI target port. 1885 */ 1886 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1887 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1888 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1889 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1890 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1891 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1892 1893 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1894 pr_err("Unable to update renaming APTPL metadata," 1895 " reallocating larger buffer\n"); 1896 ret = -EMSGSIZE; 1897 goto out; 1898 } 1899 len += sprintf(buf+len, "%s", tmp); 1900 reg_count++; 1901 } 1902 1903 if (!reg_count) 1904 len += sprintf(buf+len, "No Registrations or Reservations"); 1905 1906 out: 1907 spin_unlock(&dev->t10_pr.registration_lock); 1908 spin_unlock(&dev->dev_reservation_lock); 1909 1910 return ret; 1911 } 1912 1913 static int __core_scsi3_write_aptpl_to_file( 1914 struct se_device *dev, 1915 unsigned char *buf) 1916 { 1917 struct t10_wwn *wwn = &dev->t10_wwn; 1918 struct file *file; 1919 int flags = O_RDWR | O_CREAT | O_TRUNC; 1920 char path[512]; 1921 u32 pr_aptpl_buf_len; 1922 int ret; 1923 1924 memset(path, 0, 512); 1925 1926 if (strlen(&wwn->unit_serial[0]) >= 512) { 1927 pr_err("WWN value for struct se_device does not fit" 1928 " into path buffer\n"); 1929 return -EMSGSIZE; 1930 } 1931 1932 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1933 file = filp_open(path, flags, 0600); 1934 if (IS_ERR(file)) { 1935 pr_err("filp_open(%s) for APTPL metadata" 1936 " failed\n", path); 1937 return PTR_ERR(file); 1938 } 1939 1940 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1941 1942 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1943 1944 if (ret < 0) 1945 pr_debug("Error writing APTPL metadata file: %s\n", path); 1946 fput(file); 1947 1948 return (ret < 0) ? -EIO : 0; 1949 } 1950 1951 /* 1952 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1953 * write out the updated metadata to struct file for this SCSI device. 1954 */ 1955 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1956 { 1957 unsigned char *buf; 1958 int rc, len = PR_APTPL_BUF_LEN; 1959 1960 if (!aptpl) { 1961 char *null_buf = "No Registrations or Reservations\n"; 1962 1963 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1964 dev->t10_pr.pr_aptpl_active = 0; 1965 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1966 1967 if (rc) 1968 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1969 1970 return 0; 1971 } 1972 retry: 1973 buf = vzalloc(len); 1974 if (!buf) 1975 return TCM_OUT_OF_RESOURCES; 1976 1977 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1978 if (rc < 0) { 1979 vfree(buf); 1980 len *= 2; 1981 goto retry; 1982 } 1983 1984 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 1985 if (rc != 0) { 1986 pr_err("SPC-3 PR: Could not update APTPL\n"); 1987 vfree(buf); 1988 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1989 } 1990 dev->t10_pr.pr_aptpl_active = 1; 1991 vfree(buf); 1992 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 1993 return 0; 1994 } 1995 1996 static sense_reason_t 1997 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 1998 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 1999 { 2000 struct se_session *se_sess = cmd->se_sess; 2001 struct se_device *dev = cmd->se_dev; 2002 struct se_dev_entry *se_deve; 2003 struct se_lun *se_lun = cmd->se_lun; 2004 struct se_portal_group *se_tpg; 2005 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2006 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2007 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2008 sense_reason_t ret = TCM_NO_SENSE; 2009 int pr_holder = 0, type; 2010 2011 if (!se_sess || !se_lun) { 2012 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2013 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2014 } 2015 se_tpg = se_sess->se_tpg; 2016 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2017 2018 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2019 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2020 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2021 PR_REG_ISID_LEN); 2022 isid_ptr = &isid_buf[0]; 2023 } 2024 /* 2025 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2026 */ 2027 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2028 if (!pr_reg) { 2029 if (res_key) { 2030 pr_warn("SPC-3 PR: Reservation Key non-zero" 2031 " for SA REGISTER, returning CONFLICT\n"); 2032 return TCM_RESERVATION_CONFLICT; 2033 } 2034 /* 2035 * Do nothing but return GOOD status. 2036 */ 2037 if (!sa_res_key) 2038 return 0; 2039 2040 if (!spec_i_pt) { 2041 /* 2042 * Perform the Service Action REGISTER on the Initiator 2043 * Port Endpoint that the PRO was received from on the 2044 * Logical Unit of the SCSI device server. 2045 */ 2046 if (core_scsi3_alloc_registration(cmd->se_dev, 2047 se_sess->se_node_acl, se_deve, isid_ptr, 2048 sa_res_key, all_tg_pt, aptpl, 2049 register_type, 0)) { 2050 pr_err("Unable to allocate" 2051 " struct t10_pr_registration\n"); 2052 return TCM_INVALID_PARAMETER_LIST; 2053 } 2054 } else { 2055 /* 2056 * Register both the Initiator port that received 2057 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2058 * TransportID from Parameter list and loop through 2059 * fabric dependent parameter list while calling 2060 * logic from of core_scsi3_alloc_registration() for 2061 * each TransportID provided SCSI Initiator Port/Device 2062 */ 2063 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2064 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2065 if (ret != 0) 2066 return ret; 2067 } 2068 2069 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2070 } 2071 2072 /* ok, existing registration */ 2073 2074 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2075 pr_err("SPC-3 PR REGISTER: Received" 2076 " res_key: 0x%016Lx does not match" 2077 " existing SA REGISTER res_key:" 2078 " 0x%016Lx\n", res_key, 2079 pr_reg->pr_res_key); 2080 ret = TCM_RESERVATION_CONFLICT; 2081 goto out; 2082 } 2083 2084 if (spec_i_pt) { 2085 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2086 " set on a registered nexus\n"); 2087 ret = TCM_INVALID_PARAMETER_LIST; 2088 goto out; 2089 } 2090 2091 /* 2092 * An existing ALL_TG_PT=1 registration being released 2093 * must also set ALL_TG_PT=1 in the incoming PROUT. 2094 */ 2095 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2096 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2097 " registration exists, but ALL_TG_PT=1 bit not" 2098 " present in received PROUT\n"); 2099 ret = TCM_INVALID_CDB_FIELD; 2100 goto out; 2101 } 2102 2103 /* 2104 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2105 */ 2106 if (sa_res_key) { 2107 /* 2108 * Increment PRgeneration counter for struct se_device" 2109 * upon a successful REGISTER, see spc4r17 section 6.3.2 2110 * READ_KEYS service action. 2111 */ 2112 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2113 pr_reg->pr_res_key = sa_res_key; 2114 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2115 " Key for %s to: 0x%016Lx PRgeneration:" 2116 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2117 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2118 pr_reg->pr_reg_nacl->initiatorname, 2119 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2120 2121 } else { 2122 /* 2123 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2124 */ 2125 type = pr_reg->pr_res_type; 2126 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2127 pr_reg); 2128 if (pr_holder < 0) { 2129 ret = TCM_RESERVATION_CONFLICT; 2130 goto out; 2131 } 2132 2133 spin_lock(&pr_tmpl->registration_lock); 2134 /* 2135 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2136 * and matching pr_res_key. 2137 */ 2138 if (pr_reg->pr_reg_all_tg_pt) { 2139 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2140 &pr_tmpl->registration_list, 2141 pr_reg_list) { 2142 2143 if (!pr_reg_p->pr_reg_all_tg_pt) 2144 continue; 2145 if (pr_reg_p->pr_res_key != res_key) 2146 continue; 2147 if (pr_reg == pr_reg_p) 2148 continue; 2149 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2150 pr_reg_p->pr_reg_nacl->initiatorname)) 2151 continue; 2152 2153 __core_scsi3_free_registration(dev, 2154 pr_reg_p, NULL, 0); 2155 } 2156 } 2157 2158 /* 2159 * Release the calling I_T Nexus registration now.. 2160 */ 2161 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2162 pr_reg = NULL; 2163 2164 /* 2165 * From spc4r17, section 5.7.11.3 Unregistering 2166 * 2167 * If the persistent reservation is a registrants only 2168 * type, the device server shall establish a unit 2169 * attention condition for the initiator port associated 2170 * with every registered I_T nexus except for the I_T 2171 * nexus on which the PERSISTENT RESERVE OUT command was 2172 * received, with the additional sense code set to 2173 * RESERVATIONS RELEASED. 2174 */ 2175 if (pr_holder && 2176 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2177 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2178 list_for_each_entry(pr_reg_p, 2179 &pr_tmpl->registration_list, 2180 pr_reg_list) { 2181 2182 core_scsi3_ua_allocate( 2183 pr_reg_p->pr_reg_nacl, 2184 pr_reg_p->pr_res_mapped_lun, 2185 0x2A, 2186 ASCQ_2AH_RESERVATIONS_RELEASED); 2187 } 2188 } 2189 2190 spin_unlock(&pr_tmpl->registration_lock); 2191 } 2192 2193 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2194 2195 out: 2196 if (pr_reg) 2197 core_scsi3_put_pr_reg(pr_reg); 2198 return ret; 2199 } 2200 2201 unsigned char *core_scsi3_pr_dump_type(int type) 2202 { 2203 switch (type) { 2204 case PR_TYPE_WRITE_EXCLUSIVE: 2205 return "Write Exclusive Access"; 2206 case PR_TYPE_EXCLUSIVE_ACCESS: 2207 return "Exclusive Access"; 2208 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2209 return "Write Exclusive Access, Registrants Only"; 2210 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2211 return "Exclusive Access, Registrants Only"; 2212 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2213 return "Write Exclusive Access, All Registrants"; 2214 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2215 return "Exclusive Access, All Registrants"; 2216 default: 2217 break; 2218 } 2219 2220 return "Unknown SPC-3 PR Type"; 2221 } 2222 2223 static sense_reason_t 2224 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2225 { 2226 struct se_device *dev = cmd->se_dev; 2227 struct se_session *se_sess = cmd->se_sess; 2228 struct se_lun *se_lun = cmd->se_lun; 2229 struct t10_pr_registration *pr_reg, *pr_res_holder; 2230 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2231 char i_buf[PR_REG_ISID_ID_LEN]; 2232 sense_reason_t ret; 2233 2234 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2235 2236 if (!se_sess || !se_lun) { 2237 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2238 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2239 } 2240 /* 2241 * Locate the existing *pr_reg via struct se_node_acl pointers 2242 */ 2243 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2244 se_sess); 2245 if (!pr_reg) { 2246 pr_err("SPC-3 PR: Unable to locate" 2247 " PR_REGISTERED *pr_reg for RESERVE\n"); 2248 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2249 } 2250 /* 2251 * From spc4r17 Section 5.7.9: Reserving: 2252 * 2253 * An application client creates a persistent reservation by issuing 2254 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2255 * a registered I_T nexus with the following parameters: 2256 * a) RESERVATION KEY set to the value of the reservation key that is 2257 * registered with the logical unit for the I_T nexus; and 2258 */ 2259 if (res_key != pr_reg->pr_res_key) { 2260 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2261 " does not match existing SA REGISTER res_key:" 2262 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2263 ret = TCM_RESERVATION_CONFLICT; 2264 goto out_put_pr_reg; 2265 } 2266 /* 2267 * From spc4r17 Section 5.7.9: Reserving: 2268 * 2269 * From above: 2270 * b) TYPE field and SCOPE field set to the persistent reservation 2271 * being created. 2272 * 2273 * Only one persistent reservation is allowed at a time per logical unit 2274 * and that persistent reservation has a scope of LU_SCOPE. 2275 */ 2276 if (scope != PR_SCOPE_LU_SCOPE) { 2277 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2278 ret = TCM_INVALID_PARAMETER_LIST; 2279 goto out_put_pr_reg; 2280 } 2281 /* 2282 * See if we have an existing PR reservation holder pointer at 2283 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2284 * *pr_res_holder. 2285 */ 2286 spin_lock(&dev->dev_reservation_lock); 2287 pr_res_holder = dev->dev_pr_res_holder; 2288 if (pr_res_holder) { 2289 /* 2290 * From spc4r17 Section 5.7.9: Reserving: 2291 * 2292 * If the device server receives a PERSISTENT RESERVE OUT 2293 * command from an I_T nexus other than a persistent reservation 2294 * holder (see 5.7.10) that attempts to create a persistent 2295 * reservation when a persistent reservation already exists for 2296 * the logical unit, then the command shall be completed with 2297 * RESERVATION CONFLICT status. 2298 */ 2299 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2300 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2301 pr_err("SPC-3 PR: Attempted RESERVE from" 2302 " [%s]: %s while reservation already held by" 2303 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2304 cmd->se_tfo->get_fabric_name(), 2305 se_sess->se_node_acl->initiatorname, 2306 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2307 pr_res_holder->pr_reg_nacl->initiatorname); 2308 2309 spin_unlock(&dev->dev_reservation_lock); 2310 ret = TCM_RESERVATION_CONFLICT; 2311 goto out_put_pr_reg; 2312 } 2313 /* 2314 * From spc4r17 Section 5.7.9: Reserving: 2315 * 2316 * If a persistent reservation holder attempts to modify the 2317 * type or scope of an existing persistent reservation, the 2318 * command shall be completed with RESERVATION CONFLICT status. 2319 */ 2320 if ((pr_res_holder->pr_res_type != type) || 2321 (pr_res_holder->pr_res_scope != scope)) { 2322 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2323 pr_err("SPC-3 PR: Attempted RESERVE from" 2324 " [%s]: %s trying to change TYPE and/or SCOPE," 2325 " while reservation already held by [%s]: %s," 2326 " returning RESERVATION_CONFLICT\n", 2327 cmd->se_tfo->get_fabric_name(), 2328 se_sess->se_node_acl->initiatorname, 2329 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2330 pr_res_holder->pr_reg_nacl->initiatorname); 2331 2332 spin_unlock(&dev->dev_reservation_lock); 2333 ret = TCM_RESERVATION_CONFLICT; 2334 goto out_put_pr_reg; 2335 } 2336 /* 2337 * From spc4r17 Section 5.7.9: Reserving: 2338 * 2339 * If the device server receives a PERSISTENT RESERVE OUT 2340 * command with RESERVE service action where the TYPE field and 2341 * the SCOPE field contain the same values as the existing type 2342 * and scope from a persistent reservation holder, it shall not 2343 * make any change to the existing persistent reservation and 2344 * shall completethe command with GOOD status. 2345 */ 2346 spin_unlock(&dev->dev_reservation_lock); 2347 ret = 0; 2348 goto out_put_pr_reg; 2349 } 2350 /* 2351 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2352 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2353 */ 2354 pr_reg->pr_res_scope = scope; 2355 pr_reg->pr_res_type = type; 2356 pr_reg->pr_res_holder = 1; 2357 dev->dev_pr_res_holder = pr_reg; 2358 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2359 2360 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2361 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2362 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2363 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2364 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2365 cmd->se_tfo->get_fabric_name(), 2366 se_sess->se_node_acl->initiatorname, 2367 i_buf); 2368 spin_unlock(&dev->dev_reservation_lock); 2369 2370 if (pr_tmpl->pr_aptpl_active) 2371 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2372 2373 ret = 0; 2374 out_put_pr_reg: 2375 core_scsi3_put_pr_reg(pr_reg); 2376 return ret; 2377 } 2378 2379 static sense_reason_t 2380 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2381 u64 res_key) 2382 { 2383 switch (type) { 2384 case PR_TYPE_WRITE_EXCLUSIVE: 2385 case PR_TYPE_EXCLUSIVE_ACCESS: 2386 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2387 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2388 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2389 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2390 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2391 default: 2392 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2393 " 0x%02x\n", type); 2394 return TCM_INVALID_CDB_FIELD; 2395 } 2396 } 2397 2398 /* 2399 * Called with struct se_device->dev_reservation_lock held. 2400 */ 2401 static void __core_scsi3_complete_pro_release( 2402 struct se_device *dev, 2403 struct se_node_acl *se_nacl, 2404 struct t10_pr_registration *pr_reg, 2405 int explicit, 2406 int unreg) 2407 { 2408 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2409 char i_buf[PR_REG_ISID_ID_LEN]; 2410 int pr_res_type = 0, pr_res_scope = 0; 2411 2412 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2413 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2414 /* 2415 * Go ahead and release the current PR reservation holder. 2416 * If an All Registrants reservation is currently active and 2417 * a unregister operation is requested, replace the current 2418 * dev_pr_res_holder with another active registration. 2419 */ 2420 if (dev->dev_pr_res_holder) { 2421 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2422 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2423 dev->dev_pr_res_holder->pr_res_type = 0; 2424 dev->dev_pr_res_holder->pr_res_scope = 0; 2425 dev->dev_pr_res_holder->pr_res_holder = 0; 2426 dev->dev_pr_res_holder = NULL; 2427 } 2428 if (!unreg) 2429 goto out; 2430 2431 spin_lock(&dev->t10_pr.registration_lock); 2432 list_del_init(&pr_reg->pr_reg_list); 2433 /* 2434 * If the I_T nexus is a reservation holder, the persistent reservation 2435 * is of an all registrants type, and the I_T nexus is the last remaining 2436 * registered I_T nexus, then the device server shall also release the 2437 * persistent reservation. 2438 */ 2439 if (!list_empty(&dev->t10_pr.registration_list) && 2440 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2441 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2442 dev->dev_pr_res_holder = 2443 list_entry(dev->t10_pr.registration_list.next, 2444 struct t10_pr_registration, pr_reg_list); 2445 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2446 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2447 dev->dev_pr_res_holder->pr_res_holder = 1; 2448 } 2449 spin_unlock(&dev->t10_pr.registration_lock); 2450 out: 2451 if (!dev->dev_pr_res_holder) { 2452 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2453 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2454 tfo->get_fabric_name(), (explicit) ? "explicit" : 2455 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2456 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2457 } 2458 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2459 tfo->get_fabric_name(), se_nacl->initiatorname, 2460 i_buf); 2461 /* 2462 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2463 */ 2464 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2465 } 2466 2467 static sense_reason_t 2468 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2469 u64 res_key) 2470 { 2471 struct se_device *dev = cmd->se_dev; 2472 struct se_session *se_sess = cmd->se_sess; 2473 struct se_lun *se_lun = cmd->se_lun; 2474 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2475 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2476 sense_reason_t ret = 0; 2477 2478 if (!se_sess || !se_lun) { 2479 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2480 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2481 } 2482 /* 2483 * Locate the existing *pr_reg via struct se_node_acl pointers 2484 */ 2485 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2486 if (!pr_reg) { 2487 pr_err("SPC-3 PR: Unable to locate" 2488 " PR_REGISTERED *pr_reg for RELEASE\n"); 2489 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2490 } 2491 /* 2492 * From spc4r17 Section 5.7.11.2 Releasing: 2493 * 2494 * If there is no persistent reservation or in response to a persistent 2495 * reservation release request from a registered I_T nexus that is not a 2496 * persistent reservation holder (see 5.7.10), the device server shall 2497 * do the following: 2498 * 2499 * a) Not release the persistent reservation, if any; 2500 * b) Not remove any registrations; and 2501 * c) Complete the command with GOOD status. 2502 */ 2503 spin_lock(&dev->dev_reservation_lock); 2504 pr_res_holder = dev->dev_pr_res_holder; 2505 if (!pr_res_holder) { 2506 /* 2507 * No persistent reservation, return GOOD status. 2508 */ 2509 spin_unlock(&dev->dev_reservation_lock); 2510 goto out_put_pr_reg; 2511 } 2512 2513 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2514 /* 2515 * Release request from a registered I_T nexus that is not a 2516 * persistent reservation holder. return GOOD status. 2517 */ 2518 spin_unlock(&dev->dev_reservation_lock); 2519 goto out_put_pr_reg; 2520 } 2521 2522 /* 2523 * From spc4r17 Section 5.7.11.2 Releasing: 2524 * 2525 * Only the persistent reservation holder (see 5.7.10) is allowed to 2526 * release a persistent reservation. 2527 * 2528 * An application client releases the persistent reservation by issuing 2529 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2530 * an I_T nexus that is a persistent reservation holder with the 2531 * following parameters: 2532 * 2533 * a) RESERVATION KEY field set to the value of the reservation key 2534 * that is registered with the logical unit for the I_T nexus; 2535 */ 2536 if (res_key != pr_reg->pr_res_key) { 2537 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2538 " does not match existing SA REGISTER res_key:" 2539 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2540 spin_unlock(&dev->dev_reservation_lock); 2541 ret = TCM_RESERVATION_CONFLICT; 2542 goto out_put_pr_reg; 2543 } 2544 /* 2545 * From spc4r17 Section 5.7.11.2 Releasing and above: 2546 * 2547 * b) TYPE field and SCOPE field set to match the persistent 2548 * reservation being released. 2549 */ 2550 if ((pr_res_holder->pr_res_type != type) || 2551 (pr_res_holder->pr_res_scope != scope)) { 2552 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2553 pr_err("SPC-3 PR RELEASE: Attempted to release" 2554 " reservation from [%s]: %s with different TYPE " 2555 "and/or SCOPE while reservation already held by" 2556 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2557 cmd->se_tfo->get_fabric_name(), 2558 se_sess->se_node_acl->initiatorname, 2559 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2560 pr_res_holder->pr_reg_nacl->initiatorname); 2561 2562 spin_unlock(&dev->dev_reservation_lock); 2563 ret = TCM_RESERVATION_CONFLICT; 2564 goto out_put_pr_reg; 2565 } 2566 /* 2567 * In response to a persistent reservation release request from the 2568 * persistent reservation holder the device server shall perform a 2569 * release by doing the following as an uninterrupted series of actions: 2570 * a) Release the persistent reservation; 2571 * b) Not remove any registration(s); 2572 * c) If the released persistent reservation is a registrants only type 2573 * or all registrants type persistent reservation, 2574 * the device server shall establish a unit attention condition for 2575 * the initiator port associated with every regis- 2576 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2577 * RESERVE OUT command with RELEASE service action was received, 2578 * with the additional sense code set to RESERVATIONS RELEASED; and 2579 * d) If the persistent reservation is of any other type, the device 2580 * server shall not establish a unit attention condition. 2581 */ 2582 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2583 pr_reg, 1, 0); 2584 2585 spin_unlock(&dev->dev_reservation_lock); 2586 2587 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2588 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2589 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2590 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2591 /* 2592 * If no UNIT ATTENTION conditions will be established for 2593 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2594 * go ahead and check for APTPL=1 update+write below 2595 */ 2596 goto write_aptpl; 2597 } 2598 2599 spin_lock(&pr_tmpl->registration_lock); 2600 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2601 pr_reg_list) { 2602 /* 2603 * Do not establish a UNIT ATTENTION condition 2604 * for the calling I_T Nexus 2605 */ 2606 if (pr_reg_p == pr_reg) 2607 continue; 2608 2609 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2610 pr_reg_p->pr_res_mapped_lun, 2611 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2612 } 2613 spin_unlock(&pr_tmpl->registration_lock); 2614 2615 write_aptpl: 2616 if (pr_tmpl->pr_aptpl_active) 2617 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2618 2619 out_put_pr_reg: 2620 core_scsi3_put_pr_reg(pr_reg); 2621 return ret; 2622 } 2623 2624 static sense_reason_t 2625 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2626 { 2627 struct se_device *dev = cmd->se_dev; 2628 struct se_node_acl *pr_reg_nacl; 2629 struct se_session *se_sess = cmd->se_sess; 2630 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2631 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2632 u32 pr_res_mapped_lun = 0; 2633 int calling_it_nexus = 0; 2634 /* 2635 * Locate the existing *pr_reg via struct se_node_acl pointers 2636 */ 2637 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2638 se_sess->se_node_acl, se_sess); 2639 if (!pr_reg_n) { 2640 pr_err("SPC-3 PR: Unable to locate" 2641 " PR_REGISTERED *pr_reg for CLEAR\n"); 2642 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2643 } 2644 /* 2645 * From spc4r17 section 5.7.11.6, Clearing: 2646 * 2647 * Any application client may release the persistent reservation and 2648 * remove all registrations from a device server by issuing a 2649 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2650 * registered I_T nexus with the following parameter: 2651 * 2652 * a) RESERVATION KEY field set to the value of the reservation key 2653 * that is registered with the logical unit for the I_T nexus. 2654 */ 2655 if (res_key != pr_reg_n->pr_res_key) { 2656 pr_err("SPC-3 PR REGISTER: Received" 2657 " res_key: 0x%016Lx does not match" 2658 " existing SA REGISTER res_key:" 2659 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2660 core_scsi3_put_pr_reg(pr_reg_n); 2661 return TCM_RESERVATION_CONFLICT; 2662 } 2663 /* 2664 * a) Release the persistent reservation, if any; 2665 */ 2666 spin_lock(&dev->dev_reservation_lock); 2667 pr_res_holder = dev->dev_pr_res_holder; 2668 if (pr_res_holder) { 2669 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2670 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2671 pr_res_holder, 0, 0); 2672 } 2673 spin_unlock(&dev->dev_reservation_lock); 2674 /* 2675 * b) Remove all registration(s) (see spc4r17 5.7.7); 2676 */ 2677 spin_lock(&pr_tmpl->registration_lock); 2678 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2679 &pr_tmpl->registration_list, pr_reg_list) { 2680 2681 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2682 pr_reg_nacl = pr_reg->pr_reg_nacl; 2683 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2684 __core_scsi3_free_registration(dev, pr_reg, NULL, 2685 calling_it_nexus); 2686 /* 2687 * e) Establish a unit attention condition for the initiator 2688 * port associated with every registered I_T nexus other 2689 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2690 * command with CLEAR service action was received, with the 2691 * additional sense code set to RESERVATIONS PREEMPTED. 2692 */ 2693 if (!calling_it_nexus) 2694 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2695 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2696 } 2697 spin_unlock(&pr_tmpl->registration_lock); 2698 2699 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2700 cmd->se_tfo->get_fabric_name()); 2701 2702 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2703 2704 core_scsi3_pr_generation(dev); 2705 return 0; 2706 } 2707 2708 /* 2709 * Called with struct se_device->dev_reservation_lock held. 2710 */ 2711 static void __core_scsi3_complete_pro_preempt( 2712 struct se_device *dev, 2713 struct t10_pr_registration *pr_reg, 2714 struct list_head *preempt_and_abort_list, 2715 int type, 2716 int scope, 2717 enum preempt_type preempt_type) 2718 { 2719 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2720 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2721 char i_buf[PR_REG_ISID_ID_LEN]; 2722 2723 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2724 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2725 /* 2726 * Do an implicit RELEASE of the existing reservation. 2727 */ 2728 if (dev->dev_pr_res_holder) 2729 __core_scsi3_complete_pro_release(dev, nacl, 2730 dev->dev_pr_res_holder, 0, 0); 2731 2732 dev->dev_pr_res_holder = pr_reg; 2733 pr_reg->pr_res_holder = 1; 2734 pr_reg->pr_res_type = type; 2735 pr_reg->pr_res_scope = scope; 2736 2737 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2738 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2739 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2740 core_scsi3_pr_dump_type(type), 2741 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2742 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2743 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2744 nacl->initiatorname, i_buf); 2745 /* 2746 * For PREEMPT_AND_ABORT, add the preempting reservation's 2747 * struct t10_pr_registration to the list that will be compared 2748 * against received CDBs.. 2749 */ 2750 if (preempt_and_abort_list) 2751 list_add_tail(&pr_reg->pr_reg_abort_list, 2752 preempt_and_abort_list); 2753 } 2754 2755 static void core_scsi3_release_preempt_and_abort( 2756 struct list_head *preempt_and_abort_list, 2757 struct t10_pr_registration *pr_reg_holder) 2758 { 2759 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2760 2761 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2762 pr_reg_abort_list) { 2763 2764 list_del(&pr_reg->pr_reg_abort_list); 2765 if (pr_reg_holder == pr_reg) 2766 continue; 2767 if (pr_reg->pr_res_holder) { 2768 pr_warn("pr_reg->pr_res_holder still set\n"); 2769 continue; 2770 } 2771 2772 pr_reg->pr_reg_deve = NULL; 2773 pr_reg->pr_reg_nacl = NULL; 2774 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2775 } 2776 } 2777 2778 static sense_reason_t 2779 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2780 u64 sa_res_key, enum preempt_type preempt_type) 2781 { 2782 struct se_device *dev = cmd->se_dev; 2783 struct se_node_acl *pr_reg_nacl; 2784 struct se_session *se_sess = cmd->se_sess; 2785 LIST_HEAD(preempt_and_abort_list); 2786 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2787 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2788 u32 pr_res_mapped_lun = 0; 2789 int all_reg = 0, calling_it_nexus = 0; 2790 bool sa_res_key_unmatched = sa_res_key != 0; 2791 int prh_type = 0, prh_scope = 0; 2792 2793 if (!se_sess) 2794 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2795 2796 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2797 se_sess); 2798 if (!pr_reg_n) { 2799 pr_err("SPC-3 PR: Unable to locate" 2800 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2801 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2802 return TCM_RESERVATION_CONFLICT; 2803 } 2804 if (pr_reg_n->pr_res_key != res_key) { 2805 core_scsi3_put_pr_reg(pr_reg_n); 2806 return TCM_RESERVATION_CONFLICT; 2807 } 2808 if (scope != PR_SCOPE_LU_SCOPE) { 2809 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2810 core_scsi3_put_pr_reg(pr_reg_n); 2811 return TCM_INVALID_PARAMETER_LIST; 2812 } 2813 2814 spin_lock(&dev->dev_reservation_lock); 2815 pr_res_holder = dev->dev_pr_res_holder; 2816 if (pr_res_holder && 2817 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2818 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2819 all_reg = 1; 2820 2821 if (!all_reg && !sa_res_key) { 2822 spin_unlock(&dev->dev_reservation_lock); 2823 core_scsi3_put_pr_reg(pr_reg_n); 2824 return TCM_INVALID_PARAMETER_LIST; 2825 } 2826 /* 2827 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2828 * 2829 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2830 * persistent reservation holder or there is no persistent reservation 2831 * holder (i.e., there is no persistent reservation), then the device 2832 * server shall perform a preempt by doing the following in an 2833 * uninterrupted series of actions. (See below..) 2834 */ 2835 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2836 /* 2837 * No existing or SA Reservation Key matching reservations.. 2838 * 2839 * PROUT SA PREEMPT with All Registrant type reservations are 2840 * allowed to be processed without a matching SA Reservation Key 2841 */ 2842 spin_lock(&pr_tmpl->registration_lock); 2843 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2844 &pr_tmpl->registration_list, pr_reg_list) { 2845 /* 2846 * Removing of registrations in non all registrants 2847 * type reservations without a matching SA reservation 2848 * key. 2849 * 2850 * a) Remove the registrations for all I_T nexuses 2851 * specified by the SERVICE ACTION RESERVATION KEY 2852 * field; 2853 * b) Ignore the contents of the SCOPE and TYPE fields; 2854 * c) Process tasks as defined in 5.7.1; and 2855 * d) Establish a unit attention condition for the 2856 * initiator port associated with every I_T nexus 2857 * that lost its registration other than the I_T 2858 * nexus on which the PERSISTENT RESERVE OUT command 2859 * was received, with the additional sense code set 2860 * to REGISTRATIONS PREEMPTED. 2861 */ 2862 if (!all_reg) { 2863 if (pr_reg->pr_res_key != sa_res_key) 2864 continue; 2865 sa_res_key_unmatched = false; 2866 2867 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2868 pr_reg_nacl = pr_reg->pr_reg_nacl; 2869 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2870 __core_scsi3_free_registration(dev, pr_reg, 2871 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2872 NULL, calling_it_nexus); 2873 } else { 2874 /* 2875 * Case for any existing all registrants type 2876 * reservation, follow logic in spc4r17 section 2877 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2878 * 2879 * For a ZERO SA Reservation key, release 2880 * all other registrations and do an implicit 2881 * release of active persistent reservation. 2882 * 2883 * For a non-ZERO SA Reservation key, only 2884 * release the matching reservation key from 2885 * registrations. 2886 */ 2887 if ((sa_res_key) && 2888 (pr_reg->pr_res_key != sa_res_key)) 2889 continue; 2890 sa_res_key_unmatched = false; 2891 2892 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2893 if (calling_it_nexus) 2894 continue; 2895 2896 pr_reg_nacl = pr_reg->pr_reg_nacl; 2897 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2898 __core_scsi3_free_registration(dev, pr_reg, 2899 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2900 NULL, 0); 2901 } 2902 if (!calling_it_nexus) 2903 core_scsi3_ua_allocate(pr_reg_nacl, 2904 pr_res_mapped_lun, 0x2A, 2905 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2906 } 2907 spin_unlock(&pr_tmpl->registration_lock); 2908 /* 2909 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2910 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2911 * RESERVATION KEY field to a value that does not match any 2912 * registered reservation key, then the device server shall 2913 * complete the command with RESERVATION CONFLICT status. 2914 */ 2915 if (sa_res_key_unmatched) { 2916 spin_unlock(&dev->dev_reservation_lock); 2917 core_scsi3_put_pr_reg(pr_reg_n); 2918 return TCM_RESERVATION_CONFLICT; 2919 } 2920 /* 2921 * For an existing all registrants type reservation 2922 * with a zero SA rservation key, preempt the existing 2923 * reservation with the new PR type and scope. 2924 */ 2925 if (pr_res_holder && all_reg && !(sa_res_key)) { 2926 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2927 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2928 type, scope, preempt_type); 2929 2930 if (preempt_type == PREEMPT_AND_ABORT) 2931 core_scsi3_release_preempt_and_abort( 2932 &preempt_and_abort_list, pr_reg_n); 2933 } 2934 spin_unlock(&dev->dev_reservation_lock); 2935 2936 if (pr_tmpl->pr_aptpl_active) 2937 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2938 2939 core_scsi3_put_pr_reg(pr_reg_n); 2940 core_scsi3_pr_generation(cmd->se_dev); 2941 return 0; 2942 } 2943 /* 2944 * The PREEMPTing SA reservation key matches that of the 2945 * existing persistent reservation, first, we check if 2946 * we are preempting our own reservation. 2947 * From spc4r17, section 5.7.11.4.3 Preempting 2948 * persistent reservations and registration handling 2949 * 2950 * If an all registrants persistent reservation is not 2951 * present, it is not an error for the persistent 2952 * reservation holder to preempt itself (i.e., a 2953 * PERSISTENT RESERVE OUT with a PREEMPT service action 2954 * or a PREEMPT AND ABORT service action with the 2955 * SERVICE ACTION RESERVATION KEY value equal to the 2956 * persistent reservation holder's reservation key that 2957 * is received from the persistent reservation holder). 2958 * In that case, the device server shall establish the 2959 * new persistent reservation and maintain the 2960 * registration. 2961 */ 2962 prh_type = pr_res_holder->pr_res_type; 2963 prh_scope = pr_res_holder->pr_res_scope; 2964 /* 2965 * If the SERVICE ACTION RESERVATION KEY field identifies a 2966 * persistent reservation holder (see 5.7.10), the device 2967 * server shall perform a preempt by doing the following as 2968 * an uninterrupted series of actions: 2969 * 2970 * a) Release the persistent reservation for the holder 2971 * identified by the SERVICE ACTION RESERVATION KEY field; 2972 */ 2973 if (pr_reg_n != pr_res_holder) 2974 __core_scsi3_complete_pro_release(dev, 2975 pr_res_holder->pr_reg_nacl, 2976 dev->dev_pr_res_holder, 0, 0); 2977 /* 2978 * b) Remove the registrations for all I_T nexuses identified 2979 * by the SERVICE ACTION RESERVATION KEY field, except the 2980 * I_T nexus that is being used for the PERSISTENT RESERVE 2981 * OUT command. If an all registrants persistent reservation 2982 * is present and the SERVICE ACTION RESERVATION KEY field 2983 * is set to zero, then all registrations shall be removed 2984 * except for that of the I_T nexus that is being used for 2985 * the PERSISTENT RESERVE OUT command; 2986 */ 2987 spin_lock(&pr_tmpl->registration_lock); 2988 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2989 &pr_tmpl->registration_list, pr_reg_list) { 2990 2991 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2992 if (calling_it_nexus) 2993 continue; 2994 2995 if (pr_reg->pr_res_key != sa_res_key) 2996 continue; 2997 2998 pr_reg_nacl = pr_reg->pr_reg_nacl; 2999 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3000 __core_scsi3_free_registration(dev, pr_reg, 3001 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3002 calling_it_nexus); 3003 /* 3004 * e) Establish a unit attention condition for the initiator 3005 * port associated with every I_T nexus that lost its 3006 * persistent reservation and/or registration, with the 3007 * additional sense code set to REGISTRATIONS PREEMPTED; 3008 */ 3009 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3010 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3011 } 3012 spin_unlock(&pr_tmpl->registration_lock); 3013 /* 3014 * c) Establish a persistent reservation for the preempting 3015 * I_T nexus using the contents of the SCOPE and TYPE fields; 3016 */ 3017 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3018 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3019 type, scope, preempt_type); 3020 /* 3021 * d) Process tasks as defined in 5.7.1; 3022 * e) See above.. 3023 * f) If the type or scope has changed, then for every I_T nexus 3024 * whose reservation key was not removed, except for the I_T 3025 * nexus on which the PERSISTENT RESERVE OUT command was 3026 * received, the device server shall establish a unit 3027 * attention condition for the initiator port associated with 3028 * that I_T nexus, with the additional sense code set to 3029 * RESERVATIONS RELEASED. If the type or scope have not 3030 * changed, then no unit attention condition(s) shall be 3031 * established for this reason. 3032 */ 3033 if ((prh_type != type) || (prh_scope != scope)) { 3034 spin_lock(&pr_tmpl->registration_lock); 3035 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3036 &pr_tmpl->registration_list, pr_reg_list) { 3037 3038 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3039 if (calling_it_nexus) 3040 continue; 3041 3042 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3043 pr_reg->pr_res_mapped_lun, 0x2A, 3044 ASCQ_2AH_RESERVATIONS_RELEASED); 3045 } 3046 spin_unlock(&pr_tmpl->registration_lock); 3047 } 3048 spin_unlock(&dev->dev_reservation_lock); 3049 /* 3050 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3051 * All received CDBs for the matching existing reservation and 3052 * registrations undergo ABORT_TASK logic. 3053 * 3054 * From there, core_scsi3_release_preempt_and_abort() will 3055 * release every registration in the list (which have already 3056 * been removed from the primary pr_reg list), except the 3057 * new persistent reservation holder, the calling Initiator Port. 3058 */ 3059 if (preempt_type == PREEMPT_AND_ABORT) { 3060 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3061 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3062 pr_reg_n); 3063 } 3064 3065 if (pr_tmpl->pr_aptpl_active) 3066 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3067 3068 core_scsi3_put_pr_reg(pr_reg_n); 3069 core_scsi3_pr_generation(cmd->se_dev); 3070 return 0; 3071 } 3072 3073 static sense_reason_t 3074 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3075 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3076 { 3077 switch (type) { 3078 case PR_TYPE_WRITE_EXCLUSIVE: 3079 case PR_TYPE_EXCLUSIVE_ACCESS: 3080 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3081 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3082 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3083 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3084 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3085 sa_res_key, preempt_type); 3086 default: 3087 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3088 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3089 return TCM_INVALID_CDB_FIELD; 3090 } 3091 } 3092 3093 3094 static sense_reason_t 3095 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3096 u64 sa_res_key, int aptpl, int unreg) 3097 { 3098 struct se_session *se_sess = cmd->se_sess; 3099 struct se_device *dev = cmd->se_dev; 3100 struct se_dev_entry *dest_se_deve = NULL; 3101 struct se_lun *se_lun = cmd->se_lun; 3102 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3103 struct se_port *se_port; 3104 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3105 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3106 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3107 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3108 unsigned char *buf; 3109 unsigned char *initiator_str; 3110 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3111 u32 tid_len, tmp_tid_len; 3112 int new_reg = 0, type, scope, matching_iname; 3113 sense_reason_t ret; 3114 unsigned short rtpi; 3115 unsigned char proto_ident; 3116 3117 if (!se_sess || !se_lun) { 3118 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3119 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3120 } 3121 3122 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3123 se_tpg = se_sess->se_tpg; 3124 tf_ops = se_tpg->se_tpg_tfo; 3125 /* 3126 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3127 * Register behaviors for a REGISTER AND MOVE service action 3128 * 3129 * Locate the existing *pr_reg via struct se_node_acl pointers 3130 */ 3131 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3132 se_sess); 3133 if (!pr_reg) { 3134 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3135 " *pr_reg for REGISTER_AND_MOVE\n"); 3136 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3137 } 3138 /* 3139 * The provided reservation key much match the existing reservation key 3140 * provided during this initiator's I_T nexus registration. 3141 */ 3142 if (res_key != pr_reg->pr_res_key) { 3143 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3144 " res_key: 0x%016Lx does not match existing SA REGISTER" 3145 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3146 ret = TCM_RESERVATION_CONFLICT; 3147 goto out_put_pr_reg; 3148 } 3149 /* 3150 * The service active reservation key needs to be non zero 3151 */ 3152 if (!sa_res_key) { 3153 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3154 " sa_res_key\n"); 3155 ret = TCM_INVALID_PARAMETER_LIST; 3156 goto out_put_pr_reg; 3157 } 3158 3159 /* 3160 * Determine the Relative Target Port Identifier where the reservation 3161 * will be moved to for the TransportID containing SCSI initiator WWN 3162 * information. 3163 */ 3164 buf = transport_kmap_data_sg(cmd); 3165 if (!buf) { 3166 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3167 goto out_put_pr_reg; 3168 } 3169 3170 rtpi = (buf[18] & 0xff) << 8; 3171 rtpi |= buf[19] & 0xff; 3172 tid_len = (buf[20] & 0xff) << 24; 3173 tid_len |= (buf[21] & 0xff) << 16; 3174 tid_len |= (buf[22] & 0xff) << 8; 3175 tid_len |= buf[23] & 0xff; 3176 transport_kunmap_data_sg(cmd); 3177 buf = NULL; 3178 3179 if ((tid_len + 24) != cmd->data_length) { 3180 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3181 " does not equal CDB data_length: %u\n", tid_len, 3182 cmd->data_length); 3183 ret = TCM_INVALID_PARAMETER_LIST; 3184 goto out_put_pr_reg; 3185 } 3186 3187 spin_lock(&dev->se_port_lock); 3188 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3189 if (se_port->sep_rtpi != rtpi) 3190 continue; 3191 dest_se_tpg = se_port->sep_tpg; 3192 if (!dest_se_tpg) 3193 continue; 3194 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3195 if (!dest_tf_ops) 3196 continue; 3197 3198 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3199 spin_unlock(&dev->se_port_lock); 3200 3201 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3202 pr_err("core_scsi3_tpg_depend_item() failed" 3203 " for dest_se_tpg\n"); 3204 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3205 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3206 goto out_put_pr_reg; 3207 } 3208 3209 spin_lock(&dev->se_port_lock); 3210 break; 3211 } 3212 spin_unlock(&dev->se_port_lock); 3213 3214 if (!dest_se_tpg || !dest_tf_ops) { 3215 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3216 " fabric ops from Relative Target Port Identifier:" 3217 " %hu\n", rtpi); 3218 ret = TCM_INVALID_PARAMETER_LIST; 3219 goto out_put_pr_reg; 3220 } 3221 3222 buf = transport_kmap_data_sg(cmd); 3223 if (!buf) { 3224 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3225 goto out_put_pr_reg; 3226 } 3227 proto_ident = (buf[24] & 0x0f); 3228 3229 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3230 " 0x%02x\n", proto_ident); 3231 3232 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3233 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3234 " proto_ident: 0x%02x does not match ident: 0x%02x" 3235 " from fabric: %s\n", proto_ident, 3236 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3237 dest_tf_ops->get_fabric_name()); 3238 ret = TCM_INVALID_PARAMETER_LIST; 3239 goto out; 3240 } 3241 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3242 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3243 " containg a valid tpg_parse_pr_out_transport_id" 3244 " function pointer\n"); 3245 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3246 goto out; 3247 } 3248 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3249 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3250 if (!initiator_str) { 3251 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3252 " initiator_str from Transport ID\n"); 3253 ret = TCM_INVALID_PARAMETER_LIST; 3254 goto out; 3255 } 3256 3257 transport_kunmap_data_sg(cmd); 3258 buf = NULL; 3259 3260 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3261 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3262 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3263 iport_ptr : ""); 3264 /* 3265 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3266 * action specifies a TransportID that is the same as the initiator port 3267 * of the I_T nexus for the command received, then the command shall 3268 * be terminated with CHECK CONDITION status, with the sense key set to 3269 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3270 * IN PARAMETER LIST. 3271 */ 3272 pr_reg_nacl = pr_reg->pr_reg_nacl; 3273 matching_iname = (!strcmp(initiator_str, 3274 pr_reg_nacl->initiatorname)) ? 1 : 0; 3275 if (!matching_iname) 3276 goto after_iport_check; 3277 3278 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3279 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3280 " matches: %s on received I_T Nexus\n", initiator_str, 3281 pr_reg_nacl->initiatorname); 3282 ret = TCM_INVALID_PARAMETER_LIST; 3283 goto out; 3284 } 3285 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3286 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3287 " matches: %s %s on received I_T Nexus\n", 3288 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3289 pr_reg->pr_reg_isid); 3290 ret = TCM_INVALID_PARAMETER_LIST; 3291 goto out; 3292 } 3293 after_iport_check: 3294 /* 3295 * Locate the destination struct se_node_acl from the received Transport ID 3296 */ 3297 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3298 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3299 initiator_str); 3300 if (dest_node_acl) 3301 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3302 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3303 3304 if (!dest_node_acl) { 3305 pr_err("Unable to locate %s dest_node_acl for" 3306 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3307 initiator_str); 3308 ret = TCM_INVALID_PARAMETER_LIST; 3309 goto out; 3310 } 3311 3312 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3313 pr_err("core_scsi3_nodeacl_depend_item() for" 3314 " dest_node_acl\n"); 3315 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3316 dest_node_acl = NULL; 3317 ret = TCM_INVALID_PARAMETER_LIST; 3318 goto out; 3319 } 3320 3321 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3322 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3323 dest_node_acl->initiatorname); 3324 3325 /* 3326 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3327 * PORT IDENTIFIER. 3328 */ 3329 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3330 if (!dest_se_deve) { 3331 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3332 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3333 ret = TCM_INVALID_PARAMETER_LIST; 3334 goto out; 3335 } 3336 3337 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3338 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3339 atomic_dec_mb(&dest_se_deve->pr_ref_count); 3340 dest_se_deve = NULL; 3341 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3342 goto out; 3343 } 3344 3345 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3346 " ACL for dest_se_deve->mapped_lun: %u\n", 3347 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3348 dest_se_deve->mapped_lun); 3349 3350 /* 3351 * A persistent reservation needs to already existing in order to 3352 * successfully complete the REGISTER_AND_MOVE service action.. 3353 */ 3354 spin_lock(&dev->dev_reservation_lock); 3355 pr_res_holder = dev->dev_pr_res_holder; 3356 if (!pr_res_holder) { 3357 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3358 " currently held\n"); 3359 spin_unlock(&dev->dev_reservation_lock); 3360 ret = TCM_INVALID_CDB_FIELD; 3361 goto out; 3362 } 3363 /* 3364 * The received on I_T Nexus must be the reservation holder. 3365 * 3366 * From spc4r17 section 5.7.8 Table 50 -- 3367 * Register behaviors for a REGISTER AND MOVE service action 3368 */ 3369 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3370 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3371 " Nexus is not reservation holder\n"); 3372 spin_unlock(&dev->dev_reservation_lock); 3373 ret = TCM_RESERVATION_CONFLICT; 3374 goto out; 3375 } 3376 /* 3377 * From spc4r17 section 5.7.8: registering and moving reservation 3378 * 3379 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3380 * action is received and the established persistent reservation is a 3381 * Write Exclusive - All Registrants type or Exclusive Access - 3382 * All Registrants type reservation, then the command shall be completed 3383 * with RESERVATION CONFLICT status. 3384 */ 3385 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3386 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3387 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3388 " reservation for type: %s\n", 3389 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3390 spin_unlock(&dev->dev_reservation_lock); 3391 ret = TCM_RESERVATION_CONFLICT; 3392 goto out; 3393 } 3394 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3395 /* 3396 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3397 */ 3398 type = pr_res_holder->pr_res_type; 3399 scope = pr_res_holder->pr_res_type; 3400 /* 3401 * c) Associate the reservation key specified in the SERVICE ACTION 3402 * RESERVATION KEY field with the I_T nexus specified as the 3403 * destination of the register and move, where: 3404 * A) The I_T nexus is specified by the TransportID and the 3405 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3406 * B) Regardless of the TransportID format used, the association for 3407 * the initiator port is based on either the initiator port name 3408 * (see 3.1.71) on SCSI transport protocols where port names are 3409 * required or the initiator port identifier (see 3.1.70) on SCSI 3410 * transport protocols where port names are not required; 3411 * d) Register the reservation key specified in the SERVICE ACTION 3412 * RESERVATION KEY field; 3413 * e) Retain the reservation key specified in the SERVICE ACTION 3414 * RESERVATION KEY field and associated information; 3415 * 3416 * Also, It is not an error for a REGISTER AND MOVE service action to 3417 * register an I_T nexus that is already registered with the same 3418 * reservation key or a different reservation key. 3419 */ 3420 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3421 iport_ptr); 3422 if (!dest_pr_reg) { 3423 if (core_scsi3_alloc_registration(cmd->se_dev, 3424 dest_node_acl, dest_se_deve, iport_ptr, 3425 sa_res_key, 0, aptpl, 2, 1)) { 3426 spin_unlock(&dev->dev_reservation_lock); 3427 ret = TCM_INVALID_PARAMETER_LIST; 3428 goto out; 3429 } 3430 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3431 iport_ptr); 3432 new_reg = 1; 3433 } 3434 /* 3435 * f) Release the persistent reservation for the persistent reservation 3436 * holder (i.e., the I_T nexus on which the 3437 */ 3438 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3439 dev->dev_pr_res_holder, 0, 0); 3440 /* 3441 * g) Move the persistent reservation to the specified I_T nexus using 3442 * the same scope and type as the persistent reservation released in 3443 * item f); and 3444 */ 3445 dev->dev_pr_res_holder = dest_pr_reg; 3446 dest_pr_reg->pr_res_holder = 1; 3447 dest_pr_reg->pr_res_type = type; 3448 pr_reg->pr_res_scope = scope; 3449 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3450 /* 3451 * Increment PRGeneration for existing registrations.. 3452 */ 3453 if (!new_reg) 3454 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3455 spin_unlock(&dev->dev_reservation_lock); 3456 3457 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3458 " created new reservation holder TYPE: %s on object RTPI:" 3459 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3460 core_scsi3_pr_dump_type(type), rtpi, 3461 dest_pr_reg->pr_res_generation); 3462 pr_debug("SPC-3 PR Successfully moved reservation from" 3463 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3464 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3465 i_buf, dest_tf_ops->get_fabric_name(), 3466 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3467 iport_ptr : ""); 3468 /* 3469 * It is now safe to release configfs group dependencies for destination 3470 * of Transport ID Initiator Device/Port Identifier 3471 */ 3472 core_scsi3_lunacl_undepend_item(dest_se_deve); 3473 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3474 core_scsi3_tpg_undepend_item(dest_se_tpg); 3475 /* 3476 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3477 * nexus on which PERSISTENT RESERVE OUT command was received. 3478 */ 3479 if (unreg) { 3480 spin_lock(&pr_tmpl->registration_lock); 3481 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3482 spin_unlock(&pr_tmpl->registration_lock); 3483 } else 3484 core_scsi3_put_pr_reg(pr_reg); 3485 3486 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3487 3488 transport_kunmap_data_sg(cmd); 3489 3490 core_scsi3_put_pr_reg(dest_pr_reg); 3491 return 0; 3492 out: 3493 if (buf) 3494 transport_kunmap_data_sg(cmd); 3495 if (dest_se_deve) 3496 core_scsi3_lunacl_undepend_item(dest_se_deve); 3497 if (dest_node_acl) 3498 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3499 core_scsi3_tpg_undepend_item(dest_se_tpg); 3500 3501 out_put_pr_reg: 3502 core_scsi3_put_pr_reg(pr_reg); 3503 return ret; 3504 } 3505 3506 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3507 { 3508 unsigned int __v1, __v2; 3509 3510 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3511 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3512 3513 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3514 } 3515 3516 /* 3517 * See spc4r17 section 6.14 Table 170 3518 */ 3519 sense_reason_t 3520 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3521 { 3522 struct se_device *dev = cmd->se_dev; 3523 unsigned char *cdb = &cmd->t_task_cdb[0]; 3524 unsigned char *buf; 3525 u64 res_key, sa_res_key; 3526 int sa, scope, type, aptpl; 3527 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3528 sense_reason_t ret; 3529 3530 /* 3531 * Following spc2r20 5.5.1 Reservations overview: 3532 * 3533 * If a logical unit has been reserved by any RESERVE command and is 3534 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3535 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3536 * initiator or service action and shall terminate with a RESERVATION 3537 * CONFLICT status. 3538 */ 3539 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3540 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3541 " SPC-2 reservation is held, returning" 3542 " RESERVATION_CONFLICT\n"); 3543 return TCM_RESERVATION_CONFLICT; 3544 } 3545 3546 /* 3547 * FIXME: A NULL struct se_session pointer means an this is not coming from 3548 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3549 */ 3550 if (!cmd->se_sess) 3551 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3552 3553 if (cmd->data_length < 24) { 3554 pr_warn("SPC-PR: Received PR OUT parameter list" 3555 " length too small: %u\n", cmd->data_length); 3556 return TCM_INVALID_PARAMETER_LIST; 3557 } 3558 3559 /* 3560 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3561 */ 3562 sa = (cdb[1] & 0x1f); 3563 scope = (cdb[2] & 0xf0); 3564 type = (cdb[2] & 0x0f); 3565 3566 buf = transport_kmap_data_sg(cmd); 3567 if (!buf) 3568 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3569 3570 /* 3571 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3572 */ 3573 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3574 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3575 /* 3576 * REGISTER_AND_MOVE uses a different SA parameter list containing 3577 * SCSI TransportIDs. 3578 */ 3579 if (sa != PRO_REGISTER_AND_MOVE) { 3580 spec_i_pt = (buf[20] & 0x08); 3581 all_tg_pt = (buf[20] & 0x04); 3582 aptpl = (buf[20] & 0x01); 3583 } else { 3584 aptpl = (buf[17] & 0x01); 3585 unreg = (buf[17] & 0x02); 3586 } 3587 /* 3588 * If the backend device has been configured to force APTPL metadata 3589 * write-out, go ahead and propigate aptpl=1 down now. 3590 */ 3591 if (dev->dev_attrib.force_pr_aptpl) 3592 aptpl = 1; 3593 3594 transport_kunmap_data_sg(cmd); 3595 buf = NULL; 3596 3597 /* 3598 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3599 */ 3600 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3601 return TCM_INVALID_PARAMETER_LIST; 3602 3603 /* 3604 * From spc4r17 section 6.14: 3605 * 3606 * If the SPEC_I_PT bit is set to zero, the service action is not 3607 * REGISTER AND MOVE, and the parameter list length is not 24, then 3608 * the command shall be terminated with CHECK CONDITION status, with 3609 * the sense key set to ILLEGAL REQUEST, and the additional sense 3610 * code set to PARAMETER LIST LENGTH ERROR. 3611 */ 3612 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3613 (cmd->data_length != 24)) { 3614 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3615 " list length: %u\n", cmd->data_length); 3616 return TCM_INVALID_PARAMETER_LIST; 3617 } 3618 3619 /* 3620 * (core_scsi3_emulate_pro_* function parameters 3621 * are defined by spc4r17 Table 174: 3622 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3623 */ 3624 switch (sa) { 3625 case PRO_REGISTER: 3626 ret = core_scsi3_emulate_pro_register(cmd, 3627 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3628 break; 3629 case PRO_RESERVE: 3630 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3631 break; 3632 case PRO_RELEASE: 3633 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3634 break; 3635 case PRO_CLEAR: 3636 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3637 break; 3638 case PRO_PREEMPT: 3639 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3640 res_key, sa_res_key, PREEMPT); 3641 break; 3642 case PRO_PREEMPT_AND_ABORT: 3643 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3644 res_key, sa_res_key, PREEMPT_AND_ABORT); 3645 break; 3646 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3647 ret = core_scsi3_emulate_pro_register(cmd, 3648 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3649 break; 3650 case PRO_REGISTER_AND_MOVE: 3651 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3652 sa_res_key, aptpl, unreg); 3653 break; 3654 default: 3655 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3656 " action: 0x%02x\n", cdb[1] & 0x1f); 3657 return TCM_INVALID_CDB_FIELD; 3658 } 3659 3660 if (!ret) 3661 target_complete_cmd(cmd, GOOD); 3662 return ret; 3663 } 3664 3665 /* 3666 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3667 * 3668 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3669 */ 3670 static sense_reason_t 3671 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3672 { 3673 struct se_device *dev = cmd->se_dev; 3674 struct t10_pr_registration *pr_reg; 3675 unsigned char *buf; 3676 u32 add_len = 0, off = 8; 3677 3678 if (cmd->data_length < 8) { 3679 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3680 " too small\n", cmd->data_length); 3681 return TCM_INVALID_CDB_FIELD; 3682 } 3683 3684 buf = transport_kmap_data_sg(cmd); 3685 if (!buf) 3686 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3687 3688 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3689 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3690 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3691 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3692 3693 spin_lock(&dev->t10_pr.registration_lock); 3694 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3695 pr_reg_list) { 3696 /* 3697 * Check for overflow of 8byte PRI READ_KEYS payload and 3698 * next reservation key list descriptor. 3699 */ 3700 if ((add_len + 8) > (cmd->data_length - 8)) 3701 break; 3702 3703 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3704 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3705 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3706 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3707 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3708 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3709 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3710 buf[off++] = (pr_reg->pr_res_key & 0xff); 3711 3712 add_len += 8; 3713 } 3714 spin_unlock(&dev->t10_pr.registration_lock); 3715 3716 buf[4] = ((add_len >> 24) & 0xff); 3717 buf[5] = ((add_len >> 16) & 0xff); 3718 buf[6] = ((add_len >> 8) & 0xff); 3719 buf[7] = (add_len & 0xff); 3720 3721 transport_kunmap_data_sg(cmd); 3722 3723 return 0; 3724 } 3725 3726 /* 3727 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3728 * 3729 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3730 */ 3731 static sense_reason_t 3732 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3733 { 3734 struct se_device *dev = cmd->se_dev; 3735 struct t10_pr_registration *pr_reg; 3736 unsigned char *buf; 3737 u64 pr_res_key; 3738 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3739 3740 if (cmd->data_length < 8) { 3741 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3742 " too small\n", cmd->data_length); 3743 return TCM_INVALID_CDB_FIELD; 3744 } 3745 3746 buf = transport_kmap_data_sg(cmd); 3747 if (!buf) 3748 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3749 3750 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3751 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3752 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3753 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3754 3755 spin_lock(&dev->dev_reservation_lock); 3756 pr_reg = dev->dev_pr_res_holder; 3757 if (pr_reg) { 3758 /* 3759 * Set the hardcoded Additional Length 3760 */ 3761 buf[4] = ((add_len >> 24) & 0xff); 3762 buf[5] = ((add_len >> 16) & 0xff); 3763 buf[6] = ((add_len >> 8) & 0xff); 3764 buf[7] = (add_len & 0xff); 3765 3766 if (cmd->data_length < 22) 3767 goto err; 3768 3769 /* 3770 * Set the Reservation key. 3771 * 3772 * From spc4r17, section 5.7.10: 3773 * A persistent reservation holder has its reservation key 3774 * returned in the parameter data from a PERSISTENT 3775 * RESERVE IN command with READ RESERVATION service action as 3776 * follows: 3777 * a) For a persistent reservation of the type Write Exclusive 3778 * - All Registrants or Exclusive Access All Regitrants, 3779 * the reservation key shall be set to zero; or 3780 * b) For all other persistent reservation types, the 3781 * reservation key shall be set to the registered 3782 * reservation key for the I_T nexus that holds the 3783 * persistent reservation. 3784 */ 3785 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3786 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3787 pr_res_key = 0; 3788 else 3789 pr_res_key = pr_reg->pr_res_key; 3790 3791 buf[8] = ((pr_res_key >> 56) & 0xff); 3792 buf[9] = ((pr_res_key >> 48) & 0xff); 3793 buf[10] = ((pr_res_key >> 40) & 0xff); 3794 buf[11] = ((pr_res_key >> 32) & 0xff); 3795 buf[12] = ((pr_res_key >> 24) & 0xff); 3796 buf[13] = ((pr_res_key >> 16) & 0xff); 3797 buf[14] = ((pr_res_key >> 8) & 0xff); 3798 buf[15] = (pr_res_key & 0xff); 3799 /* 3800 * Set the SCOPE and TYPE 3801 */ 3802 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3803 (pr_reg->pr_res_type & 0x0f); 3804 } 3805 3806 err: 3807 spin_unlock(&dev->dev_reservation_lock); 3808 transport_kunmap_data_sg(cmd); 3809 3810 return 0; 3811 } 3812 3813 /* 3814 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3815 * 3816 * See spc4r17 section 6.13.4 Table 165 3817 */ 3818 static sense_reason_t 3819 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3820 { 3821 struct se_device *dev = cmd->se_dev; 3822 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3823 unsigned char *buf; 3824 u16 add_len = 8; /* Hardcoded to 8. */ 3825 3826 if (cmd->data_length < 6) { 3827 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3828 " %u too small\n", cmd->data_length); 3829 return TCM_INVALID_CDB_FIELD; 3830 } 3831 3832 buf = transport_kmap_data_sg(cmd); 3833 if (!buf) 3834 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3835 3836 buf[0] = ((add_len >> 8) & 0xff); 3837 buf[1] = (add_len & 0xff); 3838 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3839 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3840 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3841 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3842 /* 3843 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3844 * set the TMV: Task Mask Valid bit. 3845 */ 3846 buf[3] |= 0x80; 3847 /* 3848 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3849 */ 3850 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3851 /* 3852 * PTPL_A: Persistence across Target Power Loss Active bit 3853 */ 3854 if (pr_tmpl->pr_aptpl_active) 3855 buf[3] |= 0x01; 3856 /* 3857 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3858 */ 3859 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3860 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3861 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3862 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3863 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3864 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3865 3866 transport_kunmap_data_sg(cmd); 3867 3868 return 0; 3869 } 3870 3871 /* 3872 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3873 * 3874 * See spc4r17 section 6.13.5 Table 168 and 169 3875 */ 3876 static sense_reason_t 3877 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3878 { 3879 struct se_device *dev = cmd->se_dev; 3880 struct se_node_acl *se_nacl; 3881 struct se_portal_group *se_tpg; 3882 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3883 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3884 unsigned char *buf; 3885 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3886 u32 off = 8; /* off into first Full Status descriptor */ 3887 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3888 bool all_reg = false; 3889 3890 if (cmd->data_length < 8) { 3891 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3892 " too small\n", cmd->data_length); 3893 return TCM_INVALID_CDB_FIELD; 3894 } 3895 3896 buf = transport_kmap_data_sg(cmd); 3897 if (!buf) 3898 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3899 3900 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3901 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3902 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3903 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3904 3905 spin_lock(&dev->dev_reservation_lock); 3906 if (dev->dev_pr_res_holder) { 3907 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3908 3909 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3910 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3911 all_reg = true; 3912 pr_res_type = pr_holder->pr_res_type; 3913 pr_res_scope = pr_holder->pr_res_scope; 3914 } 3915 } 3916 spin_unlock(&dev->dev_reservation_lock); 3917 3918 spin_lock(&pr_tmpl->registration_lock); 3919 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3920 &pr_tmpl->registration_list, pr_reg_list) { 3921 3922 se_nacl = pr_reg->pr_reg_nacl; 3923 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3924 add_desc_len = 0; 3925 3926 atomic_inc_mb(&pr_reg->pr_res_holders); 3927 spin_unlock(&pr_tmpl->registration_lock); 3928 /* 3929 * Determine expected length of $FABRIC_MOD specific 3930 * TransportID full status descriptor.. 3931 */ 3932 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3933 se_tpg, se_nacl, pr_reg, &format_code); 3934 3935 if ((exp_desc_len + add_len) > cmd->data_length) { 3936 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3937 " out of buffer: %d\n", cmd->data_length); 3938 spin_lock(&pr_tmpl->registration_lock); 3939 atomic_dec_mb(&pr_reg->pr_res_holders); 3940 break; 3941 } 3942 /* 3943 * Set RESERVATION KEY 3944 */ 3945 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3946 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3947 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3948 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3949 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3950 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3951 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3952 buf[off++] = (pr_reg->pr_res_key & 0xff); 3953 off += 4; /* Skip Over Reserved area */ 3954 3955 /* 3956 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3957 */ 3958 if (pr_reg->pr_reg_all_tg_pt) 3959 buf[off] = 0x02; 3960 /* 3961 * The struct se_lun pointer will be present for the 3962 * reservation holder for PR_HOLDER bit. 3963 * 3964 * Also, if this registration is the reservation 3965 * holder or there is an All Registrants reservation 3966 * active, fill in SCOPE and TYPE in the next byte. 3967 */ 3968 if (pr_reg->pr_res_holder) { 3969 buf[off++] |= 0x01; 3970 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3971 (pr_reg->pr_res_type & 0x0f); 3972 } else if (all_reg) { 3973 buf[off++] |= 0x01; 3974 buf[off++] = (pr_res_scope & 0xf0) | 3975 (pr_res_type & 0x0f); 3976 } else { 3977 off += 2; 3978 } 3979 3980 off += 4; /* Skip over reserved area */ 3981 /* 3982 * From spc4r17 6.3.15: 3983 * 3984 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3985 * IDENTIFIER field contains the relative port identifier (see 3986 * 3.1.120) of the target port that is part of the I_T nexus 3987 * described by this full status descriptor. If the ALL_TG_PT 3988 * bit is set to one, the contents of the RELATIVE TARGET PORT 3989 * IDENTIFIER field are not defined by this standard. 3990 */ 3991 if (!pr_reg->pr_reg_all_tg_pt) { 3992 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 3993 3994 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 3995 buf[off++] = (port->sep_rtpi & 0xff); 3996 } else 3997 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3998 3999 /* 4000 * Now, have the $FABRIC_MOD fill in the protocol identifier 4001 */ 4002 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4003 se_nacl, pr_reg, &format_code, &buf[off+4]); 4004 4005 spin_lock(&pr_tmpl->registration_lock); 4006 atomic_dec_mb(&pr_reg->pr_res_holders); 4007 /* 4008 * Set the ADDITIONAL DESCRIPTOR LENGTH 4009 */ 4010 buf[off++] = ((desc_len >> 24) & 0xff); 4011 buf[off++] = ((desc_len >> 16) & 0xff); 4012 buf[off++] = ((desc_len >> 8) & 0xff); 4013 buf[off++] = (desc_len & 0xff); 4014 /* 4015 * Size of full desctipor header minus TransportID 4016 * containing $FABRIC_MOD specific) initiator device/port 4017 * WWN information. 4018 * 4019 * See spc4r17 Section 6.13.5 Table 169 4020 */ 4021 add_desc_len = (24 + desc_len); 4022 4023 off += desc_len; 4024 add_len += add_desc_len; 4025 } 4026 spin_unlock(&pr_tmpl->registration_lock); 4027 /* 4028 * Set ADDITIONAL_LENGTH 4029 */ 4030 buf[4] = ((add_len >> 24) & 0xff); 4031 buf[5] = ((add_len >> 16) & 0xff); 4032 buf[6] = ((add_len >> 8) & 0xff); 4033 buf[7] = (add_len & 0xff); 4034 4035 transport_kunmap_data_sg(cmd); 4036 4037 return 0; 4038 } 4039 4040 sense_reason_t 4041 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4042 { 4043 sense_reason_t ret; 4044 4045 /* 4046 * Following spc2r20 5.5.1 Reservations overview: 4047 * 4048 * If a logical unit has been reserved by any RESERVE command and is 4049 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4050 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4051 * initiator or service action and shall terminate with a RESERVATION 4052 * CONFLICT status. 4053 */ 4054 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4055 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4056 " SPC-2 reservation is held, returning" 4057 " RESERVATION_CONFLICT\n"); 4058 return TCM_RESERVATION_CONFLICT; 4059 } 4060 4061 switch (cmd->t_task_cdb[1] & 0x1f) { 4062 case PRI_READ_KEYS: 4063 ret = core_scsi3_pri_read_keys(cmd); 4064 break; 4065 case PRI_READ_RESERVATION: 4066 ret = core_scsi3_pri_read_reservation(cmd); 4067 break; 4068 case PRI_REPORT_CAPABILITIES: 4069 ret = core_scsi3_pri_report_capabilities(cmd); 4070 break; 4071 case PRI_READ_FULL_STATUS: 4072 ret = core_scsi3_pri_read_full_status(cmd); 4073 break; 4074 default: 4075 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4076 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4077 return TCM_INVALID_CDB_FIELD; 4078 } 4079 4080 if (!ret) 4081 target_complete_cmd(cmd, GOOD); 4082 return ret; 4083 } 4084 4085 sense_reason_t 4086 target_check_reservation(struct se_cmd *cmd) 4087 { 4088 struct se_device *dev = cmd->se_dev; 4089 sense_reason_t ret; 4090 4091 if (!cmd->se_sess) 4092 return 0; 4093 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4094 return 0; 4095 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4096 return 0; 4097 4098 spin_lock(&dev->dev_reservation_lock); 4099 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4100 ret = target_scsi2_reservation_check(cmd); 4101 else 4102 ret = target_scsi3_pr_reservation_check(cmd); 4103 spin_unlock(&dev->dev_reservation_lock); 4104 4105 return ret; 4106 } 4107