1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/file.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 #include <target/target_core_configfs.h> 39 40 #include "target_core_internal.h" 41 #include "target_core_pr.h" 42 #include "target_core_ua.h" 43 44 /* 45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 46 */ 47 struct pr_transport_id_holder { 48 int dest_local_nexus; 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 void core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) 62 buf[0] = '\0'; 63 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 65 } 66 67 enum register_type { 68 REGISTER, 69 REGISTER_AND_IGNORE_EXISTING_KEY, 70 REGISTER_AND_MOVE, 71 }; 72 73 enum preempt_type { 74 PREEMPT, 75 PREEMPT_AND_ABORT, 76 }; 77 78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 79 struct t10_pr_registration *, int, int); 80 81 static int is_reservation_holder( 82 struct t10_pr_registration *pr_res_holder, 83 struct t10_pr_registration *pr_reg) 84 { 85 int pr_res_type; 86 87 if (pr_res_holder) { 88 pr_res_type = pr_res_holder->pr_res_type; 89 90 return pr_res_holder == pr_reg || 91 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 92 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 93 } 94 return 0; 95 } 96 97 static sense_reason_t 98 target_scsi2_reservation_check(struct se_cmd *cmd) 99 { 100 struct se_device *dev = cmd->se_dev; 101 struct se_session *sess = cmd->se_sess; 102 103 switch (cmd->t_task_cdb[0]) { 104 case INQUIRY: 105 case RELEASE: 106 case RELEASE_10: 107 return 0; 108 default: 109 break; 110 } 111 112 if (!dev->dev_reserved_node_acl || !sess) 113 return 0; 114 115 if (dev->dev_reserved_node_acl != sess->se_node_acl) 116 return TCM_RESERVATION_CONFLICT; 117 118 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 119 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 120 return TCM_RESERVATION_CONFLICT; 121 } 122 123 return 0; 124 } 125 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 127 struct se_node_acl *, struct se_session *); 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 129 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 131 { 132 struct se_session *se_sess = cmd->se_sess; 133 struct se_device *dev = cmd->se_dev; 134 struct t10_pr_registration *pr_reg; 135 struct t10_reservation *pr_tmpl = &dev->t10_pr; 136 int conflict = 0; 137 138 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 139 se_sess); 140 if (pr_reg) { 141 /* 142 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 143 * behavior 144 * 145 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 146 * status, but no reservation shall be established and the 147 * persistent reservation shall not be changed, if the command 148 * is received from a) and b) below. 149 * 150 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 151 * status, but the persistent reservation shall not be released, 152 * if the command is received from a) and b) 153 * 154 * a) An I_T nexus that is a persistent reservation holder; or 155 * b) An I_T nexus that is registered if a registrants only or 156 * all registrants type persistent reservation is present. 157 * 158 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 159 * RELEASE(6) command, or RELEASE(10) command shall be processed 160 * as defined in SPC-2. 161 */ 162 if (pr_reg->pr_res_holder) { 163 core_scsi3_put_pr_reg(pr_reg); 164 return 1; 165 } 166 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 168 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 169 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 170 core_scsi3_put_pr_reg(pr_reg); 171 return 1; 172 } 173 core_scsi3_put_pr_reg(pr_reg); 174 conflict = 1; 175 } else { 176 /* 177 * Following spc2r20 5.5.1 Reservations overview: 178 * 179 * If a logical unit has executed a PERSISTENT RESERVE OUT 180 * command with the REGISTER or the REGISTER AND IGNORE 181 * EXISTING KEY service action and is still registered by any 182 * initiator, all RESERVE commands and all RELEASE commands 183 * regardless of initiator shall conflict and shall terminate 184 * with a RESERVATION CONFLICT status. 185 */ 186 spin_lock(&pr_tmpl->registration_lock); 187 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 188 spin_unlock(&pr_tmpl->registration_lock); 189 } 190 191 if (conflict) { 192 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 193 " while active SPC-3 registrations exist," 194 " returning RESERVATION_CONFLICT\n"); 195 return -EBUSY; 196 } 197 198 return 0; 199 } 200 201 sense_reason_t 202 target_scsi2_reservation_release(struct se_cmd *cmd) 203 { 204 struct se_device *dev = cmd->se_dev; 205 struct se_session *sess = cmd->se_sess; 206 struct se_portal_group *tpg; 207 int rc; 208 209 if (!sess || !sess->se_tpg) 210 goto out; 211 rc = target_check_scsi2_reservation_conflict(cmd); 212 if (rc == 1) 213 goto out; 214 if (rc < 0) 215 return TCM_RESERVATION_CONFLICT; 216 217 spin_lock(&dev->dev_reservation_lock); 218 if (!dev->dev_reserved_node_acl || !sess) 219 goto out_unlock; 220 221 if (dev->dev_reserved_node_acl != sess->se_node_acl) 222 goto out_unlock; 223 224 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 225 goto out_unlock; 226 227 dev->dev_reserved_node_acl = NULL; 228 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 229 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 230 dev->dev_res_bin_isid = 0; 231 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 232 } 233 tpg = sess->se_tpg; 234 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 235 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 236 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 237 sess->se_node_acl->initiatorname); 238 239 out_unlock: 240 spin_unlock(&dev->dev_reservation_lock); 241 out: 242 target_complete_cmd(cmd, GOOD); 243 return 0; 244 } 245 246 sense_reason_t 247 target_scsi2_reservation_reserve(struct se_cmd *cmd) 248 { 249 struct se_device *dev = cmd->se_dev; 250 struct se_session *sess = cmd->se_sess; 251 struct se_portal_group *tpg; 252 sense_reason_t ret = 0; 253 int rc; 254 255 if ((cmd->t_task_cdb[1] & 0x01) && 256 (cmd->t_task_cdb[1] & 0x02)) { 257 pr_err("LongIO and Obselete Bits set, returning" 258 " ILLEGAL_REQUEST\n"); 259 return TCM_UNSUPPORTED_SCSI_OPCODE; 260 } 261 /* 262 * This is currently the case for target_core_mod passthrough struct se_cmd 263 * ops 264 */ 265 if (!sess || !sess->se_tpg) 266 goto out; 267 rc = target_check_scsi2_reservation_conflict(cmd); 268 if (rc == 1) 269 goto out; 270 271 if (rc < 0) 272 return TCM_RESERVATION_CONFLICT; 273 274 tpg = sess->se_tpg; 275 spin_lock(&dev->dev_reservation_lock); 276 if (dev->dev_reserved_node_acl && 277 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 278 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 279 tpg->se_tpg_tfo->get_fabric_name()); 280 pr_err("Original reserver LUN: %u %s\n", 281 cmd->se_lun->unpacked_lun, 282 dev->dev_reserved_node_acl->initiatorname); 283 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 284 " from %s \n", cmd->se_lun->unpacked_lun, 285 cmd->se_deve->mapped_lun, 286 sess->se_node_acl->initiatorname); 287 ret = TCM_RESERVATION_CONFLICT; 288 goto out_unlock; 289 } 290 291 dev->dev_reserved_node_acl = sess->se_node_acl; 292 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 293 if (sess->sess_bin_isid != 0) { 294 dev->dev_res_bin_isid = sess->sess_bin_isid; 295 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 296 } 297 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 298 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 299 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 300 sess->se_node_acl->initiatorname); 301 302 out_unlock: 303 spin_unlock(&dev->dev_reservation_lock); 304 out: 305 if (!ret) 306 target_complete_cmd(cmd, GOOD); 307 return ret; 308 } 309 310 311 /* 312 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 313 * 314 * This function is called by those initiator ports who are *NOT* 315 * the active PR reservation holder when a reservation is present. 316 */ 317 static int core_scsi3_pr_seq_non_holder( 318 struct se_cmd *cmd, 319 u32 pr_reg_type) 320 { 321 unsigned char *cdb = cmd->t_task_cdb; 322 struct se_dev_entry *se_deve; 323 struct se_session *se_sess = cmd->se_sess; 324 int other_cdb = 0, ignore_reg; 325 int registered_nexus = 0, ret = 1; /* Conflict by default */ 326 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 327 int we = 0; /* Write Exclusive */ 328 int legacy = 0; /* Act like a legacy device and return 329 * RESERVATION CONFLICT on some CDBs */ 330 331 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 332 /* 333 * Determine if the registration should be ignored due to 334 * non-matching ISIDs in target_scsi3_pr_reservation_check(). 335 */ 336 ignore_reg = (pr_reg_type & 0x80000000); 337 if (ignore_reg) 338 pr_reg_type &= ~0x80000000; 339 340 switch (pr_reg_type) { 341 case PR_TYPE_WRITE_EXCLUSIVE: 342 we = 1; 343 case PR_TYPE_EXCLUSIVE_ACCESS: 344 /* 345 * Some commands are only allowed for the persistent reservation 346 * holder. 347 */ 348 if ((se_deve->def_pr_registered) && !(ignore_reg)) 349 registered_nexus = 1; 350 break; 351 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 352 we = 1; 353 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 354 /* 355 * Some commands are only allowed for registered I_T Nexuses. 356 */ 357 reg_only = 1; 358 if ((se_deve->def_pr_registered) && !(ignore_reg)) 359 registered_nexus = 1; 360 break; 361 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 362 we = 1; 363 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 364 /* 365 * Each registered I_T Nexus is a reservation holder. 366 */ 367 all_reg = 1; 368 if ((se_deve->def_pr_registered) && !(ignore_reg)) 369 registered_nexus = 1; 370 break; 371 default: 372 return -EINVAL; 373 } 374 /* 375 * Referenced from spc4r17 table 45 for *NON* PR holder access 376 */ 377 switch (cdb[0]) { 378 case SECURITY_PROTOCOL_IN: 379 if (registered_nexus) 380 return 0; 381 ret = (we) ? 0 : 1; 382 break; 383 case MODE_SENSE: 384 case MODE_SENSE_10: 385 case READ_ATTRIBUTE: 386 case READ_BUFFER: 387 case RECEIVE_DIAGNOSTIC: 388 if (legacy) { 389 ret = 1; 390 break; 391 } 392 if (registered_nexus) { 393 ret = 0; 394 break; 395 } 396 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 397 break; 398 case PERSISTENT_RESERVE_OUT: 399 /* 400 * This follows PERSISTENT_RESERVE_OUT service actions that 401 * are allowed in the presence of various reservations. 402 * See spc4r17, table 46 403 */ 404 switch (cdb[1] & 0x1f) { 405 case PRO_CLEAR: 406 case PRO_PREEMPT: 407 case PRO_PREEMPT_AND_ABORT: 408 ret = (registered_nexus) ? 0 : 1; 409 break; 410 case PRO_REGISTER: 411 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 412 ret = 0; 413 break; 414 case PRO_REGISTER_AND_MOVE: 415 case PRO_RESERVE: 416 ret = 1; 417 break; 418 case PRO_RELEASE: 419 ret = (registered_nexus) ? 0 : 1; 420 break; 421 default: 422 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 423 " action: 0x%02x\n", cdb[1] & 0x1f); 424 return -EINVAL; 425 } 426 break; 427 case RELEASE: 428 case RELEASE_10: 429 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 430 ret = 0; 431 break; 432 case RESERVE: 433 case RESERVE_10: 434 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 435 ret = 0; 436 break; 437 case TEST_UNIT_READY: 438 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 439 break; 440 case MAINTENANCE_IN: 441 switch (cdb[1] & 0x1f) { 442 case MI_MANAGEMENT_PROTOCOL_IN: 443 if (registered_nexus) { 444 ret = 0; 445 break; 446 } 447 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 448 break; 449 case MI_REPORT_SUPPORTED_OPERATION_CODES: 450 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 451 if (legacy) { 452 ret = 1; 453 break; 454 } 455 if (registered_nexus) { 456 ret = 0; 457 break; 458 } 459 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 460 break; 461 case MI_REPORT_ALIASES: 462 case MI_REPORT_IDENTIFYING_INFORMATION: 463 case MI_REPORT_PRIORITY: 464 case MI_REPORT_TARGET_PGS: 465 case MI_REPORT_TIMESTAMP: 466 ret = 0; /* Allowed */ 467 break; 468 default: 469 pr_err("Unknown MI Service Action: 0x%02x\n", 470 (cdb[1] & 0x1f)); 471 return -EINVAL; 472 } 473 break; 474 case ACCESS_CONTROL_IN: 475 case ACCESS_CONTROL_OUT: 476 case INQUIRY: 477 case LOG_SENSE: 478 case SERVICE_ACTION_IN_12: 479 case REPORT_LUNS: 480 case REQUEST_SENSE: 481 case PERSISTENT_RESERVE_IN: 482 ret = 0; /*/ Allowed CDBs */ 483 break; 484 default: 485 other_cdb = 1; 486 break; 487 } 488 /* 489 * Case where the CDB is explicitly allowed in the above switch 490 * statement. 491 */ 492 if (!ret && !other_cdb) { 493 pr_debug("Allowing explicit CDB: 0x%02x for %s" 494 " reservation holder\n", cdb[0], 495 core_scsi3_pr_dump_type(pr_reg_type)); 496 497 return ret; 498 } 499 /* 500 * Check if write exclusive initiator ports *NOT* holding the 501 * WRITE_EXCLUSIVE_* reservation. 502 */ 503 if (we && !registered_nexus) { 504 if (cmd->data_direction == DMA_TO_DEVICE) { 505 /* 506 * Conflict for write exclusive 507 */ 508 pr_debug("%s Conflict for unregistered nexus" 509 " %s CDB: 0x%02x to %s reservation\n", 510 transport_dump_cmd_direction(cmd), 511 se_sess->se_node_acl->initiatorname, cdb[0], 512 core_scsi3_pr_dump_type(pr_reg_type)); 513 return 1; 514 } else { 515 /* 516 * Allow non WRITE CDBs for all Write Exclusive 517 * PR TYPEs to pass for registered and 518 * non-registered_nexuxes NOT holding the reservation. 519 * 520 * We only make noise for the unregisterd nexuses, 521 * as we expect registered non-reservation holding 522 * nexuses to issue CDBs. 523 */ 524 525 if (!registered_nexus) { 526 pr_debug("Allowing implicit CDB: 0x%02x" 527 " for %s reservation on unregistered" 528 " nexus\n", cdb[0], 529 core_scsi3_pr_dump_type(pr_reg_type)); 530 } 531 532 return 0; 533 } 534 } else if ((reg_only) || (all_reg)) { 535 if (registered_nexus) { 536 /* 537 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 538 * allow commands from registered nexuses. 539 */ 540 541 pr_debug("Allowing implicit CDB: 0x%02x for %s" 542 " reservation\n", cdb[0], 543 core_scsi3_pr_dump_type(pr_reg_type)); 544 545 return 0; 546 } 547 } else if (we && registered_nexus) { 548 /* 549 * Reads are allowed for Write Exclusive locks 550 * from all registrants. 551 */ 552 if (cmd->data_direction == DMA_FROM_DEVICE) { 553 pr_debug("Allowing READ CDB: 0x%02x for %s" 554 " reservation\n", cdb[0], 555 core_scsi3_pr_dump_type(pr_reg_type)); 556 557 return 0; 558 } 559 } 560 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 561 " for %s reservation\n", transport_dump_cmd_direction(cmd), 562 (registered_nexus) ? "" : "un", 563 se_sess->se_node_acl->initiatorname, cdb[0], 564 core_scsi3_pr_dump_type(pr_reg_type)); 565 566 return 1; /* Conflict by default */ 567 } 568 569 static sense_reason_t 570 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 571 { 572 struct se_device *dev = cmd->se_dev; 573 struct se_session *sess = cmd->se_sess; 574 u32 pr_reg_type; 575 576 if (!dev->dev_pr_res_holder) 577 return 0; 578 579 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 580 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 581 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 582 goto check_nonholder; 583 584 if (dev->dev_pr_res_holder->isid_present_at_reg) { 585 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 586 sess->sess_bin_isid) { 587 pr_reg_type |= 0x80000000; 588 goto check_nonholder; 589 } 590 } 591 592 return 0; 593 594 check_nonholder: 595 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type)) 596 return TCM_RESERVATION_CONFLICT; 597 return 0; 598 } 599 600 static u32 core_scsi3_pr_generation(struct se_device *dev) 601 { 602 u32 prg; 603 604 /* 605 * PRGeneration field shall contain the value of a 32-bit wrapping 606 * counter mainted by the device server. 607 * 608 * Note that this is done regardless of Active Persist across 609 * Target PowerLoss (APTPL) 610 * 611 * See spc4r17 section 6.3.12 READ_KEYS service action 612 */ 613 spin_lock(&dev->dev_reservation_lock); 614 prg = dev->t10_pr.pr_generation++; 615 spin_unlock(&dev->dev_reservation_lock); 616 617 return prg; 618 } 619 620 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 621 struct se_device *dev, 622 struct se_node_acl *nacl, 623 struct se_dev_entry *deve, 624 unsigned char *isid, 625 u64 sa_res_key, 626 int all_tg_pt, 627 int aptpl) 628 { 629 struct t10_pr_registration *pr_reg; 630 631 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 632 if (!pr_reg) { 633 pr_err("Unable to allocate struct t10_pr_registration\n"); 634 return NULL; 635 } 636 637 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 641 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 642 atomic_set(&pr_reg->pr_res_holders, 0); 643 pr_reg->pr_reg_nacl = nacl; 644 pr_reg->pr_reg_deve = deve; 645 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 646 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 647 pr_reg->pr_res_key = sa_res_key; 648 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 649 pr_reg->pr_reg_aptpl = aptpl; 650 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 651 /* 652 * If an ISID value for this SCSI Initiator Port exists, 653 * save it to the registration now. 654 */ 655 if (isid != NULL) { 656 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 657 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 658 pr_reg->isid_present_at_reg = 1; 659 } 660 661 return pr_reg; 662 } 663 664 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 665 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 666 667 /* 668 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 669 * modes. 670 */ 671 static struct t10_pr_registration *__core_scsi3_alloc_registration( 672 struct se_device *dev, 673 struct se_node_acl *nacl, 674 struct se_dev_entry *deve, 675 unsigned char *isid, 676 u64 sa_res_key, 677 int all_tg_pt, 678 int aptpl) 679 { 680 struct se_dev_entry *deve_tmp; 681 struct se_node_acl *nacl_tmp; 682 struct se_port *port, *port_tmp; 683 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 684 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 685 int ret; 686 /* 687 * Create a registration for the I_T Nexus upon which the 688 * PROUT REGISTER was received. 689 */ 690 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 691 sa_res_key, all_tg_pt, aptpl); 692 if (!pr_reg) 693 return NULL; 694 /* 695 * Return pointer to pr_reg for ALL_TG_PT=0 696 */ 697 if (!all_tg_pt) 698 return pr_reg; 699 /* 700 * Create list of matching SCSI Initiator Port registrations 701 * for ALL_TG_PT=1 702 */ 703 spin_lock(&dev->se_port_lock); 704 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 705 atomic_inc_mb(&port->sep_tg_pt_ref_cnt); 706 spin_unlock(&dev->se_port_lock); 707 708 spin_lock_bh(&port->sep_alua_lock); 709 list_for_each_entry(deve_tmp, &port->sep_alua_list, 710 alua_port_list) { 711 /* 712 * This pointer will be NULL for demo mode MappedLUNs 713 * that have not been make explicit via a ConfigFS 714 * MappedLUN group for the SCSI Initiator Node ACL. 715 */ 716 if (!deve_tmp->se_lun_acl) 717 continue; 718 719 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 720 /* 721 * Skip the matching struct se_node_acl that is allocated 722 * above.. 723 */ 724 if (nacl == nacl_tmp) 725 continue; 726 /* 727 * Only perform PR registrations for target ports on 728 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 729 * arrived. 730 */ 731 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 732 continue; 733 /* 734 * Look for a matching Initiator Node ACL in ASCII format 735 */ 736 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 737 continue; 738 739 atomic_inc_mb(&deve_tmp->pr_ref_count); 740 spin_unlock_bh(&port->sep_alua_lock); 741 /* 742 * Grab a configfs group dependency that is released 743 * for the exception path at label out: below, or upon 744 * completion of adding ALL_TG_PT=1 registrations in 745 * __core_scsi3_add_registration() 746 */ 747 ret = core_scsi3_lunacl_depend_item(deve_tmp); 748 if (ret < 0) { 749 pr_err("core_scsi3_lunacl_depend" 750 "_item() failed\n"); 751 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 752 atomic_dec_mb(&deve_tmp->pr_ref_count); 753 goto out; 754 } 755 /* 756 * Located a matching SCSI Initiator Port on a different 757 * port, allocate the pr_reg_atp and attach it to the 758 * pr_reg->pr_reg_atp_list that will be processed once 759 * the original *pr_reg is processed in 760 * __core_scsi3_add_registration() 761 */ 762 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 763 nacl_tmp, deve_tmp, NULL, 764 sa_res_key, all_tg_pt, aptpl); 765 if (!pr_reg_atp) { 766 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 767 atomic_dec_mb(&deve_tmp->pr_ref_count); 768 core_scsi3_lunacl_undepend_item(deve_tmp); 769 goto out; 770 } 771 772 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 773 &pr_reg->pr_reg_atp_list); 774 spin_lock_bh(&port->sep_alua_lock); 775 } 776 spin_unlock_bh(&port->sep_alua_lock); 777 778 spin_lock(&dev->se_port_lock); 779 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 780 } 781 spin_unlock(&dev->se_port_lock); 782 783 return pr_reg; 784 out: 785 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 786 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 787 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 788 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 789 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 790 } 791 kmem_cache_free(t10_pr_reg_cache, pr_reg); 792 return NULL; 793 } 794 795 int core_scsi3_alloc_aptpl_registration( 796 struct t10_reservation *pr_tmpl, 797 u64 sa_res_key, 798 unsigned char *i_port, 799 unsigned char *isid, 800 u32 mapped_lun, 801 unsigned char *t_port, 802 u16 tpgt, 803 u32 target_lun, 804 int res_holder, 805 int all_tg_pt, 806 u8 type) 807 { 808 struct t10_pr_registration *pr_reg; 809 810 if (!i_port || !t_port || !sa_res_key) { 811 pr_err("Illegal parameters for APTPL registration\n"); 812 return -EINVAL; 813 } 814 815 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 816 if (!pr_reg) { 817 pr_err("Unable to allocate struct t10_pr_registration\n"); 818 return -ENOMEM; 819 } 820 821 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 822 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 823 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 824 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 825 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 826 atomic_set(&pr_reg->pr_res_holders, 0); 827 pr_reg->pr_reg_nacl = NULL; 828 pr_reg->pr_reg_deve = NULL; 829 pr_reg->pr_res_mapped_lun = mapped_lun; 830 pr_reg->pr_aptpl_target_lun = target_lun; 831 pr_reg->pr_res_key = sa_res_key; 832 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 833 pr_reg->pr_reg_aptpl = 1; 834 pr_reg->pr_reg_tg_pt_lun = NULL; 835 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 836 pr_reg->pr_res_type = type; 837 /* 838 * If an ISID value had been saved in APTPL metadata for this 839 * SCSI Initiator Port, restore it now. 840 */ 841 if (isid != NULL) { 842 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 843 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 844 pr_reg->isid_present_at_reg = 1; 845 } 846 /* 847 * Copy the i_port and t_port information from caller. 848 */ 849 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 850 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 851 pr_reg->pr_reg_tpgt = tpgt; 852 /* 853 * Set pr_res_holder from caller, the pr_reg who is the reservation 854 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 855 * the Initiator Node LUN ACL from the fabric module is created for 856 * this registration. 857 */ 858 pr_reg->pr_res_holder = res_holder; 859 860 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 861 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 862 " metadata\n", (res_holder) ? "+reservation" : ""); 863 return 0; 864 } 865 866 static void core_scsi3_aptpl_reserve( 867 struct se_device *dev, 868 struct se_portal_group *tpg, 869 struct se_node_acl *node_acl, 870 struct t10_pr_registration *pr_reg) 871 { 872 char i_buf[PR_REG_ISID_ID_LEN]; 873 874 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 875 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 876 877 spin_lock(&dev->dev_reservation_lock); 878 dev->dev_pr_res_holder = pr_reg; 879 spin_unlock(&dev->dev_reservation_lock); 880 881 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 882 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 883 tpg->se_tpg_tfo->get_fabric_name(), 884 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 885 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 886 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 887 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 888 i_buf); 889 } 890 891 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 892 struct t10_pr_registration *, enum register_type, int); 893 894 static int __core_scsi3_check_aptpl_registration( 895 struct se_device *dev, 896 struct se_portal_group *tpg, 897 struct se_lun *lun, 898 u32 target_lun, 899 struct se_node_acl *nacl, 900 struct se_dev_entry *deve) 901 { 902 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 903 struct t10_reservation *pr_tmpl = &dev->t10_pr; 904 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 905 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 906 u16 tpgt; 907 908 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 909 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 910 /* 911 * Copy Initiator Port information from struct se_node_acl 912 */ 913 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 914 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 915 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 916 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 917 /* 918 * Look for the matching registrations+reservation from those 919 * created from APTPL metadata. Note that multiple registrations 920 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 921 * TransportIDs. 922 */ 923 spin_lock(&pr_tmpl->aptpl_reg_lock); 924 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 925 pr_reg_aptpl_list) { 926 927 if (!strcmp(pr_reg->pr_iport, i_port) && 928 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 929 !(strcmp(pr_reg->pr_tport, t_port)) && 930 (pr_reg->pr_reg_tpgt == tpgt) && 931 (pr_reg->pr_aptpl_target_lun == target_lun)) { 932 933 pr_reg->pr_reg_nacl = nacl; 934 pr_reg->pr_reg_deve = deve; 935 pr_reg->pr_reg_tg_pt_lun = lun; 936 937 list_del(&pr_reg->pr_reg_aptpl_list); 938 spin_unlock(&pr_tmpl->aptpl_reg_lock); 939 /* 940 * At this point all of the pointers in *pr_reg will 941 * be setup, so go ahead and add the registration. 942 */ 943 944 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 945 /* 946 * If this registration is the reservation holder, 947 * make that happen now.. 948 */ 949 if (pr_reg->pr_res_holder) 950 core_scsi3_aptpl_reserve(dev, tpg, 951 nacl, pr_reg); 952 /* 953 * Reenable pr_aptpl_active to accept new metadata 954 * updates once the SCSI device is active again.. 955 */ 956 spin_lock(&pr_tmpl->aptpl_reg_lock); 957 pr_tmpl->pr_aptpl_active = 1; 958 } 959 } 960 spin_unlock(&pr_tmpl->aptpl_reg_lock); 961 962 return 0; 963 } 964 965 int core_scsi3_check_aptpl_registration( 966 struct se_device *dev, 967 struct se_portal_group *tpg, 968 struct se_lun *lun, 969 struct se_node_acl *nacl, 970 u32 mapped_lun) 971 { 972 struct se_dev_entry *deve = nacl->device_list[mapped_lun]; 973 974 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 975 return 0; 976 977 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 978 lun->unpacked_lun, nacl, deve); 979 } 980 981 static void __core_scsi3_dump_registration( 982 const struct target_core_fabric_ops *tfo, 983 struct se_device *dev, 984 struct se_node_acl *nacl, 985 struct t10_pr_registration *pr_reg, 986 enum register_type register_type) 987 { 988 struct se_portal_group *se_tpg = nacl->se_tpg; 989 char i_buf[PR_REG_ISID_ID_LEN]; 990 991 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 992 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 993 994 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 995 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 996 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 997 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 998 i_buf); 999 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1000 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1001 tfo->tpg_get_tag(se_tpg)); 1002 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1003 " Port(s)\n", tfo->get_fabric_name(), 1004 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1005 dev->transport->name); 1006 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1007 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1008 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1009 pr_reg->pr_reg_aptpl); 1010 } 1011 1012 /* 1013 * this function can be called with struct se_device->dev_reservation_lock 1014 * when register_move = 1 1015 */ 1016 static void __core_scsi3_add_registration( 1017 struct se_device *dev, 1018 struct se_node_acl *nacl, 1019 struct t10_pr_registration *pr_reg, 1020 enum register_type register_type, 1021 int register_move) 1022 { 1023 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1024 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1025 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1026 1027 /* 1028 * Increment PRgeneration counter for struct se_device upon a successful 1029 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1030 * 1031 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1032 * action, the struct se_device->dev_reservation_lock will already be held, 1033 * so we do not call core_scsi3_pr_generation() which grabs the lock 1034 * for the REGISTER. 1035 */ 1036 pr_reg->pr_res_generation = (register_move) ? 1037 dev->t10_pr.pr_generation++ : 1038 core_scsi3_pr_generation(dev); 1039 1040 spin_lock(&pr_tmpl->registration_lock); 1041 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1042 pr_reg->pr_reg_deve->def_pr_registered = 1; 1043 1044 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1045 spin_unlock(&pr_tmpl->registration_lock); 1046 /* 1047 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1048 */ 1049 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1050 return; 1051 /* 1052 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1053 * allocated in __core_scsi3_alloc_registration() 1054 */ 1055 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1056 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1057 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1058 1059 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1060 1061 spin_lock(&pr_tmpl->registration_lock); 1062 list_add_tail(&pr_reg_tmp->pr_reg_list, 1063 &pr_tmpl->registration_list); 1064 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1065 1066 __core_scsi3_dump_registration(tfo, dev, 1067 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1068 register_type); 1069 spin_unlock(&pr_tmpl->registration_lock); 1070 /* 1071 * Drop configfs group dependency reference from 1072 * __core_scsi3_alloc_registration() 1073 */ 1074 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1075 } 1076 } 1077 1078 static int core_scsi3_alloc_registration( 1079 struct se_device *dev, 1080 struct se_node_acl *nacl, 1081 struct se_dev_entry *deve, 1082 unsigned char *isid, 1083 u64 sa_res_key, 1084 int all_tg_pt, 1085 int aptpl, 1086 enum register_type register_type, 1087 int register_move) 1088 { 1089 struct t10_pr_registration *pr_reg; 1090 1091 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1092 sa_res_key, all_tg_pt, aptpl); 1093 if (!pr_reg) 1094 return -EPERM; 1095 1096 __core_scsi3_add_registration(dev, nacl, pr_reg, 1097 register_type, register_move); 1098 return 0; 1099 } 1100 1101 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1102 struct se_device *dev, 1103 struct se_node_acl *nacl, 1104 unsigned char *isid) 1105 { 1106 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1107 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1108 struct se_portal_group *tpg; 1109 1110 spin_lock(&pr_tmpl->registration_lock); 1111 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1112 &pr_tmpl->registration_list, pr_reg_list) { 1113 /* 1114 * First look for a matching struct se_node_acl 1115 */ 1116 if (pr_reg->pr_reg_nacl != nacl) 1117 continue; 1118 1119 tpg = pr_reg->pr_reg_nacl->se_tpg; 1120 /* 1121 * If this registration does NOT contain a fabric provided 1122 * ISID, then we have found a match. 1123 */ 1124 if (!pr_reg->isid_present_at_reg) { 1125 /* 1126 * Determine if this SCSI device server requires that 1127 * SCSI Intiatior TransportID w/ ISIDs is enforced 1128 * for fabric modules (iSCSI) requiring them. 1129 */ 1130 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1131 if (dev->dev_attrib.enforce_pr_isids) 1132 continue; 1133 } 1134 atomic_inc_mb(&pr_reg->pr_res_holders); 1135 spin_unlock(&pr_tmpl->registration_lock); 1136 return pr_reg; 1137 } 1138 /* 1139 * If the *pr_reg contains a fabric defined ISID for multi-value 1140 * SCSI Initiator Port TransportIDs, then we expect a valid 1141 * matching ISID to be provided by the local SCSI Initiator Port. 1142 */ 1143 if (!isid) 1144 continue; 1145 if (strcmp(isid, pr_reg->pr_reg_isid)) 1146 continue; 1147 1148 atomic_inc_mb(&pr_reg->pr_res_holders); 1149 spin_unlock(&pr_tmpl->registration_lock); 1150 return pr_reg; 1151 } 1152 spin_unlock(&pr_tmpl->registration_lock); 1153 1154 return NULL; 1155 } 1156 1157 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1158 struct se_device *dev, 1159 struct se_node_acl *nacl, 1160 struct se_session *sess) 1161 { 1162 struct se_portal_group *tpg = nacl->se_tpg; 1163 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1164 1165 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1166 memset(&buf[0], 0, PR_REG_ISID_LEN); 1167 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1168 PR_REG_ISID_LEN); 1169 isid_ptr = &buf[0]; 1170 } 1171 1172 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1173 } 1174 1175 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1176 { 1177 atomic_dec_mb(&pr_reg->pr_res_holders); 1178 } 1179 1180 static int core_scsi3_check_implicit_release( 1181 struct se_device *dev, 1182 struct t10_pr_registration *pr_reg) 1183 { 1184 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1185 struct t10_pr_registration *pr_res_holder; 1186 int ret = 0; 1187 1188 spin_lock(&dev->dev_reservation_lock); 1189 pr_res_holder = dev->dev_pr_res_holder; 1190 if (!pr_res_holder) { 1191 spin_unlock(&dev->dev_reservation_lock); 1192 return ret; 1193 } 1194 if (pr_res_holder == pr_reg) { 1195 /* 1196 * Perform an implicit RELEASE if the registration that 1197 * is being released is holding the reservation. 1198 * 1199 * From spc4r17, section 5.7.11.1: 1200 * 1201 * e) If the I_T nexus is the persistent reservation holder 1202 * and the persistent reservation is not an all registrants 1203 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1204 * service action or REGISTER AND IGNORE EXISTING KEY 1205 * service action with the SERVICE ACTION RESERVATION KEY 1206 * field set to zero (see 5.7.11.3). 1207 */ 1208 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1209 ret = 1; 1210 /* 1211 * For 'All Registrants' reservation types, all existing 1212 * registrations are still processed as reservation holders 1213 * in core_scsi3_pr_seq_non_holder() after the initial 1214 * reservation holder is implicitly released here. 1215 */ 1216 } else if (pr_reg->pr_reg_all_tg_pt && 1217 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1218 pr_reg->pr_reg_nacl->initiatorname)) && 1219 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1220 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1221 " UNREGISTER while existing reservation with matching" 1222 " key 0x%016Lx is present from another SCSI Initiator" 1223 " Port\n", pr_reg->pr_res_key); 1224 ret = -EPERM; 1225 } 1226 spin_unlock(&dev->dev_reservation_lock); 1227 1228 return ret; 1229 } 1230 1231 /* 1232 * Called with struct t10_reservation->registration_lock held. 1233 */ 1234 static void __core_scsi3_free_registration( 1235 struct se_device *dev, 1236 struct t10_pr_registration *pr_reg, 1237 struct list_head *preempt_and_abort_list, 1238 int dec_holders) 1239 __releases(&pr_tmpl->registration_lock) 1240 __acquires(&pr_tmpl->registration_lock) 1241 { 1242 const struct target_core_fabric_ops *tfo = 1243 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1244 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1245 char i_buf[PR_REG_ISID_ID_LEN]; 1246 1247 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1248 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1249 1250 pr_reg->pr_reg_deve->def_pr_registered = 0; 1251 pr_reg->pr_reg_deve->pr_res_key = 0; 1252 if (!list_empty(&pr_reg->pr_reg_list)) 1253 list_del(&pr_reg->pr_reg_list); 1254 /* 1255 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1256 * so call core_scsi3_put_pr_reg() to decrement our reference. 1257 */ 1258 if (dec_holders) 1259 core_scsi3_put_pr_reg(pr_reg); 1260 /* 1261 * Wait until all reference from any other I_T nexuses for this 1262 * *pr_reg have been released. Because list_del() is called above, 1263 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1264 * count back to zero, and we release *pr_reg. 1265 */ 1266 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1267 spin_unlock(&pr_tmpl->registration_lock); 1268 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1269 tfo->get_fabric_name()); 1270 cpu_relax(); 1271 spin_lock(&pr_tmpl->registration_lock); 1272 } 1273 1274 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1275 " Node: %s%s\n", tfo->get_fabric_name(), 1276 pr_reg->pr_reg_nacl->initiatorname, 1277 i_buf); 1278 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1279 " Port(s)\n", tfo->get_fabric_name(), 1280 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1281 dev->transport->name); 1282 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1283 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1284 pr_reg->pr_res_generation); 1285 1286 if (!preempt_and_abort_list) { 1287 pr_reg->pr_reg_deve = NULL; 1288 pr_reg->pr_reg_nacl = NULL; 1289 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1290 return; 1291 } 1292 /* 1293 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1294 * are released once the ABORT_TASK_SET has completed.. 1295 */ 1296 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1297 } 1298 1299 void core_scsi3_free_pr_reg_from_nacl( 1300 struct se_device *dev, 1301 struct se_node_acl *nacl) 1302 { 1303 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1304 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1305 bool free_reg = false; 1306 /* 1307 * If the passed se_node_acl matches the reservation holder, 1308 * release the reservation. 1309 */ 1310 spin_lock(&dev->dev_reservation_lock); 1311 pr_res_holder = dev->dev_pr_res_holder; 1312 if ((pr_res_holder != NULL) && 1313 (pr_res_holder->pr_reg_nacl == nacl)) { 1314 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1315 free_reg = true; 1316 } 1317 spin_unlock(&dev->dev_reservation_lock); 1318 /* 1319 * Release any registration associated with the struct se_node_acl. 1320 */ 1321 spin_lock(&pr_tmpl->registration_lock); 1322 if (pr_res_holder && free_reg) 1323 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1324 1325 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1326 &pr_tmpl->registration_list, pr_reg_list) { 1327 1328 if (pr_reg->pr_reg_nacl != nacl) 1329 continue; 1330 1331 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1332 } 1333 spin_unlock(&pr_tmpl->registration_lock); 1334 } 1335 1336 void core_scsi3_free_all_registrations( 1337 struct se_device *dev) 1338 { 1339 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1340 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1341 1342 spin_lock(&dev->dev_reservation_lock); 1343 pr_res_holder = dev->dev_pr_res_holder; 1344 if (pr_res_holder != NULL) { 1345 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1346 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1347 pr_res_holder, 0, 0); 1348 } 1349 spin_unlock(&dev->dev_reservation_lock); 1350 1351 spin_lock(&pr_tmpl->registration_lock); 1352 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1353 &pr_tmpl->registration_list, pr_reg_list) { 1354 1355 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1356 } 1357 spin_unlock(&pr_tmpl->registration_lock); 1358 1359 spin_lock(&pr_tmpl->aptpl_reg_lock); 1360 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1361 pr_reg_aptpl_list) { 1362 list_del(&pr_reg->pr_reg_aptpl_list); 1363 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1364 } 1365 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1366 } 1367 1368 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1369 { 1370 return target_depend_item(&tpg->tpg_group.cg_item); 1371 } 1372 1373 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1374 { 1375 target_undepend_item(&tpg->tpg_group.cg_item); 1376 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1377 } 1378 1379 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1380 { 1381 if (nacl->dynamic_node_acl) 1382 return 0; 1383 return target_depend_item(&nacl->acl_group.cg_item); 1384 } 1385 1386 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1387 { 1388 if (!nacl->dynamic_node_acl) 1389 target_undepend_item(&nacl->acl_group.cg_item); 1390 atomic_dec_mb(&nacl->acl_pr_ref_count); 1391 } 1392 1393 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1394 { 1395 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1396 struct se_node_acl *nacl; 1397 struct se_portal_group *tpg; 1398 /* 1399 * For nacl->dynamic_node_acl=1 1400 */ 1401 if (!lun_acl) 1402 return 0; 1403 1404 nacl = lun_acl->se_lun_nacl; 1405 tpg = nacl->se_tpg; 1406 1407 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1408 } 1409 1410 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1411 { 1412 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1413 struct se_node_acl *nacl; 1414 struct se_portal_group *tpg; 1415 /* 1416 * For nacl->dynamic_node_acl=1 1417 */ 1418 if (!lun_acl) { 1419 atomic_dec_mb(&se_deve->pr_ref_count); 1420 return; 1421 } 1422 nacl = lun_acl->se_lun_nacl; 1423 tpg = nacl->se_tpg; 1424 1425 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1426 atomic_dec_mb(&se_deve->pr_ref_count); 1427 } 1428 1429 static sense_reason_t 1430 core_scsi3_decode_spec_i_port( 1431 struct se_cmd *cmd, 1432 struct se_portal_group *tpg, 1433 unsigned char *l_isid, 1434 u64 sa_res_key, 1435 int all_tg_pt, 1436 int aptpl) 1437 { 1438 struct se_device *dev = cmd->se_dev; 1439 struct se_port *tmp_port; 1440 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1441 struct se_session *se_sess = cmd->se_sess; 1442 struct se_node_acl *dest_node_acl = NULL; 1443 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1444 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1445 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1446 LIST_HEAD(tid_dest_list); 1447 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1448 const struct target_core_fabric_ops *tmp_tf_ops; 1449 unsigned char *buf; 1450 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1451 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1452 sense_reason_t ret; 1453 u32 tpdl, tid_len = 0; 1454 int dest_local_nexus; 1455 u32 dest_rtpi = 0; 1456 1457 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1458 /* 1459 * Allocate a struct pr_transport_id_holder and setup the 1460 * local_node_acl and local_se_deve pointers and add to 1461 * struct list_head tid_dest_list for add registration 1462 * processing in the loop of tid_dest_list below. 1463 */ 1464 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1465 if (!tidh_new) { 1466 pr_err("Unable to allocate tidh_new\n"); 1467 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1468 } 1469 INIT_LIST_HEAD(&tidh_new->dest_list); 1470 tidh_new->dest_tpg = tpg; 1471 tidh_new->dest_node_acl = se_sess->se_node_acl; 1472 tidh_new->dest_se_deve = local_se_deve; 1473 1474 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1475 se_sess->se_node_acl, local_se_deve, l_isid, 1476 sa_res_key, all_tg_pt, aptpl); 1477 if (!local_pr_reg) { 1478 kfree(tidh_new); 1479 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1480 } 1481 tidh_new->dest_pr_reg = local_pr_reg; 1482 /* 1483 * The local I_T nexus does not hold any configfs dependances, 1484 * so we set tid_h->dest_local_nexus=1 to prevent the 1485 * configfs_undepend_item() calls in the tid_dest_list loops below. 1486 */ 1487 tidh_new->dest_local_nexus = 1; 1488 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1489 1490 if (cmd->data_length < 28) { 1491 pr_warn("SPC-PR: Received PR OUT parameter list" 1492 " length too small: %u\n", cmd->data_length); 1493 ret = TCM_INVALID_PARAMETER_LIST; 1494 goto out; 1495 } 1496 1497 buf = transport_kmap_data_sg(cmd); 1498 if (!buf) { 1499 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1500 goto out; 1501 } 1502 1503 /* 1504 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1505 * first extract TransportID Parameter Data Length, and make sure 1506 * the value matches up to the SCSI expected data transfer length. 1507 */ 1508 tpdl = (buf[24] & 0xff) << 24; 1509 tpdl |= (buf[25] & 0xff) << 16; 1510 tpdl |= (buf[26] & 0xff) << 8; 1511 tpdl |= buf[27] & 0xff; 1512 1513 if ((tpdl + 28) != cmd->data_length) { 1514 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1515 " does not equal CDB data_length: %u\n", tpdl, 1516 cmd->data_length); 1517 ret = TCM_INVALID_PARAMETER_LIST; 1518 goto out_unmap; 1519 } 1520 /* 1521 * Start processing the received transport IDs using the 1522 * receiving I_T Nexus portal's fabric dependent methods to 1523 * obtain the SCSI Initiator Port/Device Identifiers. 1524 */ 1525 ptr = &buf[28]; 1526 1527 while (tpdl > 0) { 1528 proto_ident = (ptr[0] & 0x0f); 1529 dest_tpg = NULL; 1530 1531 spin_lock(&dev->se_port_lock); 1532 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1533 tmp_tpg = tmp_port->sep_tpg; 1534 if (!tmp_tpg) 1535 continue; 1536 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1537 if (!tmp_tf_ops) 1538 continue; 1539 if (!tmp_tf_ops->get_fabric_proto_ident || 1540 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1541 continue; 1542 /* 1543 * Look for the matching proto_ident provided by 1544 * the received TransportID 1545 */ 1546 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1547 if (tmp_proto_ident != proto_ident) 1548 continue; 1549 dest_rtpi = tmp_port->sep_rtpi; 1550 1551 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1552 tmp_tpg, (const char *)ptr, &tid_len, 1553 &iport_ptr); 1554 if (!i_str) 1555 continue; 1556 1557 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1558 spin_unlock(&dev->se_port_lock); 1559 1560 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1561 pr_err(" core_scsi3_tpg_depend_item()" 1562 " for tmp_tpg\n"); 1563 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1564 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1565 goto out_unmap; 1566 } 1567 /* 1568 * Locate the destination initiator ACL to be registered 1569 * from the decoded fabric module specific TransportID 1570 * at *i_str. 1571 */ 1572 spin_lock_irq(&tmp_tpg->acl_node_lock); 1573 dest_node_acl = __core_tpg_get_initiator_node_acl( 1574 tmp_tpg, i_str); 1575 if (dest_node_acl) 1576 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1577 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1578 1579 if (!dest_node_acl) { 1580 core_scsi3_tpg_undepend_item(tmp_tpg); 1581 spin_lock(&dev->se_port_lock); 1582 continue; 1583 } 1584 1585 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1586 pr_err("configfs_depend_item() failed" 1587 " for dest_node_acl->acl_group\n"); 1588 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1589 core_scsi3_tpg_undepend_item(tmp_tpg); 1590 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1591 goto out_unmap; 1592 } 1593 1594 dest_tpg = tmp_tpg; 1595 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1596 " %s Port RTPI: %hu\n", 1597 dest_tpg->se_tpg_tfo->get_fabric_name(), 1598 dest_node_acl->initiatorname, dest_rtpi); 1599 1600 spin_lock(&dev->se_port_lock); 1601 break; 1602 } 1603 spin_unlock(&dev->se_port_lock); 1604 1605 if (!dest_tpg) { 1606 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1607 " dest_tpg\n"); 1608 ret = TCM_INVALID_PARAMETER_LIST; 1609 goto out_unmap; 1610 } 1611 1612 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1613 " tid_len: %d for %s + %s\n", 1614 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1615 tpdl, tid_len, i_str, iport_ptr); 1616 1617 if (tid_len > tpdl) { 1618 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1619 " %u for Transport ID: %s\n", tid_len, ptr); 1620 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1621 core_scsi3_tpg_undepend_item(dest_tpg); 1622 ret = TCM_INVALID_PARAMETER_LIST; 1623 goto out_unmap; 1624 } 1625 /* 1626 * Locate the desintation struct se_dev_entry pointer for matching 1627 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1628 * Target Port. 1629 */ 1630 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1631 dest_rtpi); 1632 if (!dest_se_deve) { 1633 pr_err("Unable to locate %s dest_se_deve" 1634 " from destination RTPI: %hu\n", 1635 dest_tpg->se_tpg_tfo->get_fabric_name(), 1636 dest_rtpi); 1637 1638 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1639 core_scsi3_tpg_undepend_item(dest_tpg); 1640 ret = TCM_INVALID_PARAMETER_LIST; 1641 goto out_unmap; 1642 } 1643 1644 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1645 pr_err("core_scsi3_lunacl_depend_item()" 1646 " failed\n"); 1647 atomic_dec_mb(&dest_se_deve->pr_ref_count); 1648 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1649 core_scsi3_tpg_undepend_item(dest_tpg); 1650 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1651 goto out_unmap; 1652 } 1653 1654 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1655 " dest_se_deve mapped_lun: %u\n", 1656 dest_tpg->se_tpg_tfo->get_fabric_name(), 1657 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1658 1659 /* 1660 * Skip any TransportIDs that already have a registration for 1661 * this target port. 1662 */ 1663 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1664 iport_ptr); 1665 if (pr_reg_e) { 1666 core_scsi3_put_pr_reg(pr_reg_e); 1667 core_scsi3_lunacl_undepend_item(dest_se_deve); 1668 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1669 core_scsi3_tpg_undepend_item(dest_tpg); 1670 ptr += tid_len; 1671 tpdl -= tid_len; 1672 tid_len = 0; 1673 continue; 1674 } 1675 /* 1676 * Allocate a struct pr_transport_id_holder and setup 1677 * the dest_node_acl and dest_se_deve pointers for the 1678 * loop below. 1679 */ 1680 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1681 GFP_KERNEL); 1682 if (!tidh_new) { 1683 pr_err("Unable to allocate tidh_new\n"); 1684 core_scsi3_lunacl_undepend_item(dest_se_deve); 1685 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1686 core_scsi3_tpg_undepend_item(dest_tpg); 1687 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1688 goto out_unmap; 1689 } 1690 INIT_LIST_HEAD(&tidh_new->dest_list); 1691 tidh_new->dest_tpg = dest_tpg; 1692 tidh_new->dest_node_acl = dest_node_acl; 1693 tidh_new->dest_se_deve = dest_se_deve; 1694 1695 /* 1696 * Allocate, but do NOT add the registration for the 1697 * TransportID referenced SCSI Initiator port. This 1698 * done because of the following from spc4r17 in section 1699 * 6.14.3 wrt SPEC_I_PT: 1700 * 1701 * "If a registration fails for any initiator port (e.g., if th 1702 * logical unit does not have enough resources available to 1703 * hold the registration information), no registrations shall be 1704 * made, and the command shall be terminated with 1705 * CHECK CONDITION status." 1706 * 1707 * That means we call __core_scsi3_alloc_registration() here, 1708 * and then call __core_scsi3_add_registration() in the 1709 * 2nd loop which will never fail. 1710 */ 1711 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1712 dest_node_acl, dest_se_deve, iport_ptr, 1713 sa_res_key, all_tg_pt, aptpl); 1714 if (!dest_pr_reg) { 1715 core_scsi3_lunacl_undepend_item(dest_se_deve); 1716 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1717 core_scsi3_tpg_undepend_item(dest_tpg); 1718 kfree(tidh_new); 1719 ret = TCM_INVALID_PARAMETER_LIST; 1720 goto out_unmap; 1721 } 1722 tidh_new->dest_pr_reg = dest_pr_reg; 1723 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1724 1725 ptr += tid_len; 1726 tpdl -= tid_len; 1727 tid_len = 0; 1728 1729 } 1730 1731 transport_kunmap_data_sg(cmd); 1732 1733 /* 1734 * Go ahead and create a registrations from tid_dest_list for the 1735 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1736 * and dest_se_deve. 1737 * 1738 * The SA Reservation Key from the PROUT is set for the 1739 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1740 * means that the TransportID Initiator port will be 1741 * registered on all of the target ports in the SCSI target device 1742 * ALL_TG_PT=0 means the registration will only be for the 1743 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1744 * was received. 1745 */ 1746 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1747 dest_tpg = tidh->dest_tpg; 1748 dest_node_acl = tidh->dest_node_acl; 1749 dest_se_deve = tidh->dest_se_deve; 1750 dest_pr_reg = tidh->dest_pr_reg; 1751 dest_local_nexus = tidh->dest_local_nexus; 1752 1753 list_del(&tidh->dest_list); 1754 kfree(tidh); 1755 1756 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1757 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1758 1759 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1760 dest_pr_reg, 0, 0); 1761 1762 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1763 " registered Transport ID for Node: %s%s Mapped LUN:" 1764 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1765 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun); 1766 1767 if (dest_local_nexus) 1768 continue; 1769 1770 core_scsi3_lunacl_undepend_item(dest_se_deve); 1771 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1772 core_scsi3_tpg_undepend_item(dest_tpg); 1773 } 1774 1775 return 0; 1776 out_unmap: 1777 transport_kunmap_data_sg(cmd); 1778 out: 1779 /* 1780 * For the failure case, release everything from tid_dest_list 1781 * including *dest_pr_reg and the configfs dependances.. 1782 */ 1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1784 dest_tpg = tidh->dest_tpg; 1785 dest_node_acl = tidh->dest_node_acl; 1786 dest_se_deve = tidh->dest_se_deve; 1787 dest_pr_reg = tidh->dest_pr_reg; 1788 dest_local_nexus = tidh->dest_local_nexus; 1789 1790 list_del(&tidh->dest_list); 1791 kfree(tidh); 1792 /* 1793 * Release any extra ALL_TG_PT=1 registrations for 1794 * the SPEC_I_PT=1 case. 1795 */ 1796 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1797 &dest_pr_reg->pr_reg_atp_list, 1798 pr_reg_atp_mem_list) { 1799 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1800 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1801 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1802 } 1803 1804 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1805 1806 if (dest_local_nexus) 1807 continue; 1808 1809 core_scsi3_lunacl_undepend_item(dest_se_deve); 1810 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1811 core_scsi3_tpg_undepend_item(dest_tpg); 1812 } 1813 return ret; 1814 } 1815 1816 static int core_scsi3_update_aptpl_buf( 1817 struct se_device *dev, 1818 unsigned char *buf, 1819 u32 pr_aptpl_buf_len) 1820 { 1821 struct se_lun *lun; 1822 struct se_portal_group *tpg; 1823 struct t10_pr_registration *pr_reg; 1824 unsigned char tmp[512], isid_buf[32]; 1825 ssize_t len = 0; 1826 int reg_count = 0; 1827 int ret = 0; 1828 1829 spin_lock(&dev->dev_reservation_lock); 1830 spin_lock(&dev->t10_pr.registration_lock); 1831 /* 1832 * Walk the registration list.. 1833 */ 1834 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1835 pr_reg_list) { 1836 1837 tmp[0] = '\0'; 1838 isid_buf[0] = '\0'; 1839 tpg = pr_reg->pr_reg_nacl->se_tpg; 1840 lun = pr_reg->pr_reg_tg_pt_lun; 1841 /* 1842 * Write out any ISID value to APTPL metadata that was included 1843 * in the original registration. 1844 */ 1845 if (pr_reg->isid_present_at_reg) 1846 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1847 pr_reg->pr_reg_isid); 1848 /* 1849 * Include special metadata if the pr_reg matches the 1850 * reservation holder. 1851 */ 1852 if (dev->dev_pr_res_holder == pr_reg) { 1853 snprintf(tmp, 512, "PR_REG_START: %d" 1854 "\ninitiator_fabric=%s\n" 1855 "initiator_node=%s\n%s" 1856 "sa_res_key=%llu\n" 1857 "res_holder=1\nres_type=%02x\n" 1858 "res_scope=%02x\nres_all_tg_pt=%d\n" 1859 "mapped_lun=%u\n", reg_count, 1860 tpg->se_tpg_tfo->get_fabric_name(), 1861 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1862 pr_reg->pr_res_key, pr_reg->pr_res_type, 1863 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1864 pr_reg->pr_res_mapped_lun); 1865 } else { 1866 snprintf(tmp, 512, "PR_REG_START: %d\n" 1867 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1868 "sa_res_key=%llu\nres_holder=0\n" 1869 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1870 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1871 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1872 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1873 pr_reg->pr_res_mapped_lun); 1874 } 1875 1876 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1877 pr_err("Unable to update renaming APTPL metadata," 1878 " reallocating larger buffer\n"); 1879 ret = -EMSGSIZE; 1880 goto out; 1881 } 1882 len += sprintf(buf+len, "%s", tmp); 1883 1884 /* 1885 * Include information about the associated SCSI target port. 1886 */ 1887 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1888 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1889 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1890 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1891 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1892 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1893 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1895 pr_err("Unable to update renaming APTPL metadata," 1896 " reallocating larger buffer\n"); 1897 ret = -EMSGSIZE; 1898 goto out; 1899 } 1900 len += sprintf(buf+len, "%s", tmp); 1901 reg_count++; 1902 } 1903 1904 if (!reg_count) 1905 len += sprintf(buf+len, "No Registrations or Reservations"); 1906 1907 out: 1908 spin_unlock(&dev->t10_pr.registration_lock); 1909 spin_unlock(&dev->dev_reservation_lock); 1910 1911 return ret; 1912 } 1913 1914 static int __core_scsi3_write_aptpl_to_file( 1915 struct se_device *dev, 1916 unsigned char *buf) 1917 { 1918 struct t10_wwn *wwn = &dev->t10_wwn; 1919 struct file *file; 1920 int flags = O_RDWR | O_CREAT | O_TRUNC; 1921 char path[512]; 1922 u32 pr_aptpl_buf_len; 1923 int ret; 1924 1925 memset(path, 0, 512); 1926 1927 if (strlen(&wwn->unit_serial[0]) >= 512) { 1928 pr_err("WWN value for struct se_device does not fit" 1929 " into path buffer\n"); 1930 return -EMSGSIZE; 1931 } 1932 1933 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1934 file = filp_open(path, flags, 0600); 1935 if (IS_ERR(file)) { 1936 pr_err("filp_open(%s) for APTPL metadata" 1937 " failed\n", path); 1938 return PTR_ERR(file); 1939 } 1940 1941 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1942 1943 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1944 1945 if (ret < 0) 1946 pr_debug("Error writing APTPL metadata file: %s\n", path); 1947 fput(file); 1948 1949 return (ret < 0) ? -EIO : 0; 1950 } 1951 1952 /* 1953 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1954 * write out the updated metadata to struct file for this SCSI device. 1955 */ 1956 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1957 { 1958 unsigned char *buf; 1959 int rc, len = PR_APTPL_BUF_LEN; 1960 1961 if (!aptpl) { 1962 char *null_buf = "No Registrations or Reservations\n"; 1963 1964 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1965 dev->t10_pr.pr_aptpl_active = 0; 1966 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1967 1968 if (rc) 1969 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1970 1971 return 0; 1972 } 1973 retry: 1974 buf = vzalloc(len); 1975 if (!buf) 1976 return TCM_OUT_OF_RESOURCES; 1977 1978 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1979 if (rc < 0) { 1980 vfree(buf); 1981 len *= 2; 1982 goto retry; 1983 } 1984 1985 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 1986 if (rc != 0) { 1987 pr_err("SPC-3 PR: Could not update APTPL\n"); 1988 vfree(buf); 1989 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1990 } 1991 dev->t10_pr.pr_aptpl_active = 1; 1992 vfree(buf); 1993 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 1994 return 0; 1995 } 1996 1997 static sense_reason_t 1998 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 1999 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2000 { 2001 struct se_session *se_sess = cmd->se_sess; 2002 struct se_device *dev = cmd->se_dev; 2003 struct se_dev_entry *se_deve; 2004 struct se_lun *se_lun = cmd->se_lun; 2005 struct se_portal_group *se_tpg; 2006 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2007 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2008 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2009 sense_reason_t ret = TCM_NO_SENSE; 2010 int pr_holder = 0, type; 2011 2012 if (!se_sess || !se_lun) { 2013 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2014 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2015 } 2016 se_tpg = se_sess->se_tpg; 2017 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2018 2019 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2020 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2021 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2022 PR_REG_ISID_LEN); 2023 isid_ptr = &isid_buf[0]; 2024 } 2025 /* 2026 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2027 */ 2028 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2029 if (!pr_reg) { 2030 if (res_key) { 2031 pr_warn("SPC-3 PR: Reservation Key non-zero" 2032 " for SA REGISTER, returning CONFLICT\n"); 2033 return TCM_RESERVATION_CONFLICT; 2034 } 2035 /* 2036 * Do nothing but return GOOD status. 2037 */ 2038 if (!sa_res_key) 2039 return 0; 2040 2041 if (!spec_i_pt) { 2042 /* 2043 * Perform the Service Action REGISTER on the Initiator 2044 * Port Endpoint that the PRO was received from on the 2045 * Logical Unit of the SCSI device server. 2046 */ 2047 if (core_scsi3_alloc_registration(cmd->se_dev, 2048 se_sess->se_node_acl, se_deve, isid_ptr, 2049 sa_res_key, all_tg_pt, aptpl, 2050 register_type, 0)) { 2051 pr_err("Unable to allocate" 2052 " struct t10_pr_registration\n"); 2053 return TCM_INVALID_PARAMETER_LIST; 2054 } 2055 } else { 2056 /* 2057 * Register both the Initiator port that received 2058 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2059 * TransportID from Parameter list and loop through 2060 * fabric dependent parameter list while calling 2061 * logic from of core_scsi3_alloc_registration() for 2062 * each TransportID provided SCSI Initiator Port/Device 2063 */ 2064 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2065 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2066 if (ret != 0) 2067 return ret; 2068 } 2069 2070 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2071 } 2072 2073 /* ok, existing registration */ 2074 2075 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2076 pr_err("SPC-3 PR REGISTER: Received" 2077 " res_key: 0x%016Lx does not match" 2078 " existing SA REGISTER res_key:" 2079 " 0x%016Lx\n", res_key, 2080 pr_reg->pr_res_key); 2081 ret = TCM_RESERVATION_CONFLICT; 2082 goto out; 2083 } 2084 2085 if (spec_i_pt) { 2086 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2087 " set on a registered nexus\n"); 2088 ret = TCM_INVALID_PARAMETER_LIST; 2089 goto out; 2090 } 2091 2092 /* 2093 * An existing ALL_TG_PT=1 registration being released 2094 * must also set ALL_TG_PT=1 in the incoming PROUT. 2095 */ 2096 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2097 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2098 " registration exists, but ALL_TG_PT=1 bit not" 2099 " present in received PROUT\n"); 2100 ret = TCM_INVALID_CDB_FIELD; 2101 goto out; 2102 } 2103 2104 /* 2105 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2106 */ 2107 if (sa_res_key) { 2108 /* 2109 * Increment PRgeneration counter for struct se_device" 2110 * upon a successful REGISTER, see spc4r17 section 6.3.2 2111 * READ_KEYS service action. 2112 */ 2113 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2114 pr_reg->pr_res_key = sa_res_key; 2115 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2116 " Key for %s to: 0x%016Lx PRgeneration:" 2117 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2118 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2119 pr_reg->pr_reg_nacl->initiatorname, 2120 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2121 2122 } else { 2123 /* 2124 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2125 */ 2126 type = pr_reg->pr_res_type; 2127 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2128 pr_reg); 2129 if (pr_holder < 0) { 2130 ret = TCM_RESERVATION_CONFLICT; 2131 goto out; 2132 } 2133 2134 spin_lock(&pr_tmpl->registration_lock); 2135 /* 2136 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2137 * and matching pr_res_key. 2138 */ 2139 if (pr_reg->pr_reg_all_tg_pt) { 2140 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2141 &pr_tmpl->registration_list, 2142 pr_reg_list) { 2143 2144 if (!pr_reg_p->pr_reg_all_tg_pt) 2145 continue; 2146 if (pr_reg_p->pr_res_key != res_key) 2147 continue; 2148 if (pr_reg == pr_reg_p) 2149 continue; 2150 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2151 pr_reg_p->pr_reg_nacl->initiatorname)) 2152 continue; 2153 2154 __core_scsi3_free_registration(dev, 2155 pr_reg_p, NULL, 0); 2156 } 2157 } 2158 2159 /* 2160 * Release the calling I_T Nexus registration now.. 2161 */ 2162 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2163 pr_reg = NULL; 2164 2165 /* 2166 * From spc4r17, section 5.7.11.3 Unregistering 2167 * 2168 * If the persistent reservation is a registrants only 2169 * type, the device server shall establish a unit 2170 * attention condition for the initiator port associated 2171 * with every registered I_T nexus except for the I_T 2172 * nexus on which the PERSISTENT RESERVE OUT command was 2173 * received, with the additional sense code set to 2174 * RESERVATIONS RELEASED. 2175 */ 2176 if (pr_holder && 2177 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2178 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2179 list_for_each_entry(pr_reg_p, 2180 &pr_tmpl->registration_list, 2181 pr_reg_list) { 2182 2183 core_scsi3_ua_allocate( 2184 pr_reg_p->pr_reg_nacl, 2185 pr_reg_p->pr_res_mapped_lun, 2186 0x2A, 2187 ASCQ_2AH_RESERVATIONS_RELEASED); 2188 } 2189 } 2190 2191 spin_unlock(&pr_tmpl->registration_lock); 2192 } 2193 2194 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2195 2196 out: 2197 if (pr_reg) 2198 core_scsi3_put_pr_reg(pr_reg); 2199 return ret; 2200 } 2201 2202 unsigned char *core_scsi3_pr_dump_type(int type) 2203 { 2204 switch (type) { 2205 case PR_TYPE_WRITE_EXCLUSIVE: 2206 return "Write Exclusive Access"; 2207 case PR_TYPE_EXCLUSIVE_ACCESS: 2208 return "Exclusive Access"; 2209 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2210 return "Write Exclusive Access, Registrants Only"; 2211 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2212 return "Exclusive Access, Registrants Only"; 2213 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2214 return "Write Exclusive Access, All Registrants"; 2215 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2216 return "Exclusive Access, All Registrants"; 2217 default: 2218 break; 2219 } 2220 2221 return "Unknown SPC-3 PR Type"; 2222 } 2223 2224 static sense_reason_t 2225 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2226 { 2227 struct se_device *dev = cmd->se_dev; 2228 struct se_session *se_sess = cmd->se_sess; 2229 struct se_lun *se_lun = cmd->se_lun; 2230 struct t10_pr_registration *pr_reg, *pr_res_holder; 2231 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2232 char i_buf[PR_REG_ISID_ID_LEN]; 2233 sense_reason_t ret; 2234 2235 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2236 2237 if (!se_sess || !se_lun) { 2238 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2239 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2240 } 2241 /* 2242 * Locate the existing *pr_reg via struct se_node_acl pointers 2243 */ 2244 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2245 se_sess); 2246 if (!pr_reg) { 2247 pr_err("SPC-3 PR: Unable to locate" 2248 " PR_REGISTERED *pr_reg for RESERVE\n"); 2249 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2250 } 2251 /* 2252 * From spc4r17 Section 5.7.9: Reserving: 2253 * 2254 * An application client creates a persistent reservation by issuing 2255 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2256 * a registered I_T nexus with the following parameters: 2257 * a) RESERVATION KEY set to the value of the reservation key that is 2258 * registered with the logical unit for the I_T nexus; and 2259 */ 2260 if (res_key != pr_reg->pr_res_key) { 2261 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2262 " does not match existing SA REGISTER res_key:" 2263 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2264 ret = TCM_RESERVATION_CONFLICT; 2265 goto out_put_pr_reg; 2266 } 2267 /* 2268 * From spc4r17 Section 5.7.9: Reserving: 2269 * 2270 * From above: 2271 * b) TYPE field and SCOPE field set to the persistent reservation 2272 * being created. 2273 * 2274 * Only one persistent reservation is allowed at a time per logical unit 2275 * and that persistent reservation has a scope of LU_SCOPE. 2276 */ 2277 if (scope != PR_SCOPE_LU_SCOPE) { 2278 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2279 ret = TCM_INVALID_PARAMETER_LIST; 2280 goto out_put_pr_reg; 2281 } 2282 /* 2283 * See if we have an existing PR reservation holder pointer at 2284 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2285 * *pr_res_holder. 2286 */ 2287 spin_lock(&dev->dev_reservation_lock); 2288 pr_res_holder = dev->dev_pr_res_holder; 2289 if (pr_res_holder) { 2290 /* 2291 * From spc4r17 Section 5.7.9: Reserving: 2292 * 2293 * If the device server receives a PERSISTENT RESERVE OUT 2294 * command from an I_T nexus other than a persistent reservation 2295 * holder (see 5.7.10) that attempts to create a persistent 2296 * reservation when a persistent reservation already exists for 2297 * the logical unit, then the command shall be completed with 2298 * RESERVATION CONFLICT status. 2299 */ 2300 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2301 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2302 pr_err("SPC-3 PR: Attempted RESERVE from" 2303 " [%s]: %s while reservation already held by" 2304 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2305 cmd->se_tfo->get_fabric_name(), 2306 se_sess->se_node_acl->initiatorname, 2307 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2308 pr_res_holder->pr_reg_nacl->initiatorname); 2309 2310 spin_unlock(&dev->dev_reservation_lock); 2311 ret = TCM_RESERVATION_CONFLICT; 2312 goto out_put_pr_reg; 2313 } 2314 /* 2315 * From spc4r17 Section 5.7.9: Reserving: 2316 * 2317 * If a persistent reservation holder attempts to modify the 2318 * type or scope of an existing persistent reservation, the 2319 * command shall be completed with RESERVATION CONFLICT status. 2320 */ 2321 if ((pr_res_holder->pr_res_type != type) || 2322 (pr_res_holder->pr_res_scope != scope)) { 2323 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2324 pr_err("SPC-3 PR: Attempted RESERVE from" 2325 " [%s]: %s trying to change TYPE and/or SCOPE," 2326 " while reservation already held by [%s]: %s," 2327 " returning RESERVATION_CONFLICT\n", 2328 cmd->se_tfo->get_fabric_name(), 2329 se_sess->se_node_acl->initiatorname, 2330 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2331 pr_res_holder->pr_reg_nacl->initiatorname); 2332 2333 spin_unlock(&dev->dev_reservation_lock); 2334 ret = TCM_RESERVATION_CONFLICT; 2335 goto out_put_pr_reg; 2336 } 2337 /* 2338 * From spc4r17 Section 5.7.9: Reserving: 2339 * 2340 * If the device server receives a PERSISTENT RESERVE OUT 2341 * command with RESERVE service action where the TYPE field and 2342 * the SCOPE field contain the same values as the existing type 2343 * and scope from a persistent reservation holder, it shall not 2344 * make any change to the existing persistent reservation and 2345 * shall completethe command with GOOD status. 2346 */ 2347 spin_unlock(&dev->dev_reservation_lock); 2348 ret = 0; 2349 goto out_put_pr_reg; 2350 } 2351 /* 2352 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2353 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2354 */ 2355 pr_reg->pr_res_scope = scope; 2356 pr_reg->pr_res_type = type; 2357 pr_reg->pr_res_holder = 1; 2358 dev->dev_pr_res_holder = pr_reg; 2359 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2360 2361 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2362 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2363 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2364 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2365 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2366 cmd->se_tfo->get_fabric_name(), 2367 se_sess->se_node_acl->initiatorname, 2368 i_buf); 2369 spin_unlock(&dev->dev_reservation_lock); 2370 2371 if (pr_tmpl->pr_aptpl_active) 2372 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2373 2374 ret = 0; 2375 out_put_pr_reg: 2376 core_scsi3_put_pr_reg(pr_reg); 2377 return ret; 2378 } 2379 2380 static sense_reason_t 2381 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2382 u64 res_key) 2383 { 2384 switch (type) { 2385 case PR_TYPE_WRITE_EXCLUSIVE: 2386 case PR_TYPE_EXCLUSIVE_ACCESS: 2387 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2388 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2389 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2390 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2391 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2392 default: 2393 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2394 " 0x%02x\n", type); 2395 return TCM_INVALID_CDB_FIELD; 2396 } 2397 } 2398 2399 /* 2400 * Called with struct se_device->dev_reservation_lock held. 2401 */ 2402 static void __core_scsi3_complete_pro_release( 2403 struct se_device *dev, 2404 struct se_node_acl *se_nacl, 2405 struct t10_pr_registration *pr_reg, 2406 int explicit, 2407 int unreg) 2408 { 2409 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2410 char i_buf[PR_REG_ISID_ID_LEN]; 2411 int pr_res_type = 0, pr_res_scope = 0; 2412 2413 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2414 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2415 /* 2416 * Go ahead and release the current PR reservation holder. 2417 * If an All Registrants reservation is currently active and 2418 * a unregister operation is requested, replace the current 2419 * dev_pr_res_holder with another active registration. 2420 */ 2421 if (dev->dev_pr_res_holder) { 2422 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2423 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2424 dev->dev_pr_res_holder->pr_res_type = 0; 2425 dev->dev_pr_res_holder->pr_res_scope = 0; 2426 dev->dev_pr_res_holder->pr_res_holder = 0; 2427 dev->dev_pr_res_holder = NULL; 2428 } 2429 if (!unreg) 2430 goto out; 2431 2432 spin_lock(&dev->t10_pr.registration_lock); 2433 list_del_init(&pr_reg->pr_reg_list); 2434 /* 2435 * If the I_T nexus is a reservation holder, the persistent reservation 2436 * is of an all registrants type, and the I_T nexus is the last remaining 2437 * registered I_T nexus, then the device server shall also release the 2438 * persistent reservation. 2439 */ 2440 if (!list_empty(&dev->t10_pr.registration_list) && 2441 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2442 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2443 dev->dev_pr_res_holder = 2444 list_entry(dev->t10_pr.registration_list.next, 2445 struct t10_pr_registration, pr_reg_list); 2446 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2447 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2448 dev->dev_pr_res_holder->pr_res_holder = 1; 2449 } 2450 spin_unlock(&dev->t10_pr.registration_lock); 2451 out: 2452 if (!dev->dev_pr_res_holder) { 2453 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2454 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2455 tfo->get_fabric_name(), (explicit) ? "explicit" : 2456 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2457 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2458 } 2459 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2460 tfo->get_fabric_name(), se_nacl->initiatorname, 2461 i_buf); 2462 /* 2463 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2464 */ 2465 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2466 } 2467 2468 static sense_reason_t 2469 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2470 u64 res_key) 2471 { 2472 struct se_device *dev = cmd->se_dev; 2473 struct se_session *se_sess = cmd->se_sess; 2474 struct se_lun *se_lun = cmd->se_lun; 2475 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2476 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2477 sense_reason_t ret = 0; 2478 2479 if (!se_sess || !se_lun) { 2480 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2481 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2482 } 2483 /* 2484 * Locate the existing *pr_reg via struct se_node_acl pointers 2485 */ 2486 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2487 if (!pr_reg) { 2488 pr_err("SPC-3 PR: Unable to locate" 2489 " PR_REGISTERED *pr_reg for RELEASE\n"); 2490 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2491 } 2492 /* 2493 * From spc4r17 Section 5.7.11.2 Releasing: 2494 * 2495 * If there is no persistent reservation or in response to a persistent 2496 * reservation release request from a registered I_T nexus that is not a 2497 * persistent reservation holder (see 5.7.10), the device server shall 2498 * do the following: 2499 * 2500 * a) Not release the persistent reservation, if any; 2501 * b) Not remove any registrations; and 2502 * c) Complete the command with GOOD status. 2503 */ 2504 spin_lock(&dev->dev_reservation_lock); 2505 pr_res_holder = dev->dev_pr_res_holder; 2506 if (!pr_res_holder) { 2507 /* 2508 * No persistent reservation, return GOOD status. 2509 */ 2510 spin_unlock(&dev->dev_reservation_lock); 2511 goto out_put_pr_reg; 2512 } 2513 2514 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2515 /* 2516 * Release request from a registered I_T nexus that is not a 2517 * persistent reservation holder. return GOOD status. 2518 */ 2519 spin_unlock(&dev->dev_reservation_lock); 2520 goto out_put_pr_reg; 2521 } 2522 2523 /* 2524 * From spc4r17 Section 5.7.11.2 Releasing: 2525 * 2526 * Only the persistent reservation holder (see 5.7.10) is allowed to 2527 * release a persistent reservation. 2528 * 2529 * An application client releases the persistent reservation by issuing 2530 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2531 * an I_T nexus that is a persistent reservation holder with the 2532 * following parameters: 2533 * 2534 * a) RESERVATION KEY field set to the value of the reservation key 2535 * that is registered with the logical unit for the I_T nexus; 2536 */ 2537 if (res_key != pr_reg->pr_res_key) { 2538 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2539 " does not match existing SA REGISTER res_key:" 2540 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2541 spin_unlock(&dev->dev_reservation_lock); 2542 ret = TCM_RESERVATION_CONFLICT; 2543 goto out_put_pr_reg; 2544 } 2545 /* 2546 * From spc4r17 Section 5.7.11.2 Releasing and above: 2547 * 2548 * b) TYPE field and SCOPE field set to match the persistent 2549 * reservation being released. 2550 */ 2551 if ((pr_res_holder->pr_res_type != type) || 2552 (pr_res_holder->pr_res_scope != scope)) { 2553 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2554 pr_err("SPC-3 PR RELEASE: Attempted to release" 2555 " reservation from [%s]: %s with different TYPE " 2556 "and/or SCOPE while reservation already held by" 2557 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2558 cmd->se_tfo->get_fabric_name(), 2559 se_sess->se_node_acl->initiatorname, 2560 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2561 pr_res_holder->pr_reg_nacl->initiatorname); 2562 2563 spin_unlock(&dev->dev_reservation_lock); 2564 ret = TCM_RESERVATION_CONFLICT; 2565 goto out_put_pr_reg; 2566 } 2567 /* 2568 * In response to a persistent reservation release request from the 2569 * persistent reservation holder the device server shall perform a 2570 * release by doing the following as an uninterrupted series of actions: 2571 * a) Release the persistent reservation; 2572 * b) Not remove any registration(s); 2573 * c) If the released persistent reservation is a registrants only type 2574 * or all registrants type persistent reservation, 2575 * the device server shall establish a unit attention condition for 2576 * the initiator port associated with every regis- 2577 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2578 * RESERVE OUT command with RELEASE service action was received, 2579 * with the additional sense code set to RESERVATIONS RELEASED; and 2580 * d) If the persistent reservation is of any other type, the device 2581 * server shall not establish a unit attention condition. 2582 */ 2583 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2584 pr_reg, 1, 0); 2585 2586 spin_unlock(&dev->dev_reservation_lock); 2587 2588 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2589 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2590 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2591 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2592 /* 2593 * If no UNIT ATTENTION conditions will be established for 2594 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2595 * go ahead and check for APTPL=1 update+write below 2596 */ 2597 goto write_aptpl; 2598 } 2599 2600 spin_lock(&pr_tmpl->registration_lock); 2601 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2602 pr_reg_list) { 2603 /* 2604 * Do not establish a UNIT ATTENTION condition 2605 * for the calling I_T Nexus 2606 */ 2607 if (pr_reg_p == pr_reg) 2608 continue; 2609 2610 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2611 pr_reg_p->pr_res_mapped_lun, 2612 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2613 } 2614 spin_unlock(&pr_tmpl->registration_lock); 2615 2616 write_aptpl: 2617 if (pr_tmpl->pr_aptpl_active) 2618 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2619 2620 out_put_pr_reg: 2621 core_scsi3_put_pr_reg(pr_reg); 2622 return ret; 2623 } 2624 2625 static sense_reason_t 2626 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2627 { 2628 struct se_device *dev = cmd->se_dev; 2629 struct se_node_acl *pr_reg_nacl; 2630 struct se_session *se_sess = cmd->se_sess; 2631 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2632 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2633 u32 pr_res_mapped_lun = 0; 2634 int calling_it_nexus = 0; 2635 /* 2636 * Locate the existing *pr_reg via struct se_node_acl pointers 2637 */ 2638 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2639 se_sess->se_node_acl, se_sess); 2640 if (!pr_reg_n) { 2641 pr_err("SPC-3 PR: Unable to locate" 2642 " PR_REGISTERED *pr_reg for CLEAR\n"); 2643 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2644 } 2645 /* 2646 * From spc4r17 section 5.7.11.6, Clearing: 2647 * 2648 * Any application client may release the persistent reservation and 2649 * remove all registrations from a device server by issuing a 2650 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2651 * registered I_T nexus with the following parameter: 2652 * 2653 * a) RESERVATION KEY field set to the value of the reservation key 2654 * that is registered with the logical unit for the I_T nexus. 2655 */ 2656 if (res_key != pr_reg_n->pr_res_key) { 2657 pr_err("SPC-3 PR REGISTER: Received" 2658 " res_key: 0x%016Lx does not match" 2659 " existing SA REGISTER res_key:" 2660 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2661 core_scsi3_put_pr_reg(pr_reg_n); 2662 return TCM_RESERVATION_CONFLICT; 2663 } 2664 /* 2665 * a) Release the persistent reservation, if any; 2666 */ 2667 spin_lock(&dev->dev_reservation_lock); 2668 pr_res_holder = dev->dev_pr_res_holder; 2669 if (pr_res_holder) { 2670 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2671 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2672 pr_res_holder, 0, 0); 2673 } 2674 spin_unlock(&dev->dev_reservation_lock); 2675 /* 2676 * b) Remove all registration(s) (see spc4r17 5.7.7); 2677 */ 2678 spin_lock(&pr_tmpl->registration_lock); 2679 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2680 &pr_tmpl->registration_list, pr_reg_list) { 2681 2682 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2683 pr_reg_nacl = pr_reg->pr_reg_nacl; 2684 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2685 __core_scsi3_free_registration(dev, pr_reg, NULL, 2686 calling_it_nexus); 2687 /* 2688 * e) Establish a unit attention condition for the initiator 2689 * port associated with every registered I_T nexus other 2690 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2691 * command with CLEAR service action was received, with the 2692 * additional sense code set to RESERVATIONS PREEMPTED. 2693 */ 2694 if (!calling_it_nexus) 2695 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2696 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2697 } 2698 spin_unlock(&pr_tmpl->registration_lock); 2699 2700 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2701 cmd->se_tfo->get_fabric_name()); 2702 2703 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2704 2705 core_scsi3_pr_generation(dev); 2706 return 0; 2707 } 2708 2709 /* 2710 * Called with struct se_device->dev_reservation_lock held. 2711 */ 2712 static void __core_scsi3_complete_pro_preempt( 2713 struct se_device *dev, 2714 struct t10_pr_registration *pr_reg, 2715 struct list_head *preempt_and_abort_list, 2716 int type, 2717 int scope, 2718 enum preempt_type preempt_type) 2719 { 2720 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2721 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2722 char i_buf[PR_REG_ISID_ID_LEN]; 2723 2724 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2725 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2726 /* 2727 * Do an implicit RELEASE of the existing reservation. 2728 */ 2729 if (dev->dev_pr_res_holder) 2730 __core_scsi3_complete_pro_release(dev, nacl, 2731 dev->dev_pr_res_holder, 0, 0); 2732 2733 dev->dev_pr_res_holder = pr_reg; 2734 pr_reg->pr_res_holder = 1; 2735 pr_reg->pr_res_type = type; 2736 pr_reg->pr_res_scope = scope; 2737 2738 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2739 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2740 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2741 core_scsi3_pr_dump_type(type), 2742 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2743 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2744 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2745 nacl->initiatorname, i_buf); 2746 /* 2747 * For PREEMPT_AND_ABORT, add the preempting reservation's 2748 * struct t10_pr_registration to the list that will be compared 2749 * against received CDBs.. 2750 */ 2751 if (preempt_and_abort_list) 2752 list_add_tail(&pr_reg->pr_reg_abort_list, 2753 preempt_and_abort_list); 2754 } 2755 2756 static void core_scsi3_release_preempt_and_abort( 2757 struct list_head *preempt_and_abort_list, 2758 struct t10_pr_registration *pr_reg_holder) 2759 { 2760 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2761 2762 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2763 pr_reg_abort_list) { 2764 2765 list_del(&pr_reg->pr_reg_abort_list); 2766 if (pr_reg_holder == pr_reg) 2767 continue; 2768 if (pr_reg->pr_res_holder) { 2769 pr_warn("pr_reg->pr_res_holder still set\n"); 2770 continue; 2771 } 2772 2773 pr_reg->pr_reg_deve = NULL; 2774 pr_reg->pr_reg_nacl = NULL; 2775 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2776 } 2777 } 2778 2779 static sense_reason_t 2780 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2781 u64 sa_res_key, enum preempt_type preempt_type) 2782 { 2783 struct se_device *dev = cmd->se_dev; 2784 struct se_node_acl *pr_reg_nacl; 2785 struct se_session *se_sess = cmd->se_sess; 2786 LIST_HEAD(preempt_and_abort_list); 2787 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2788 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2789 u32 pr_res_mapped_lun = 0; 2790 int all_reg = 0, calling_it_nexus = 0; 2791 bool sa_res_key_unmatched = sa_res_key != 0; 2792 int prh_type = 0, prh_scope = 0; 2793 2794 if (!se_sess) 2795 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2796 2797 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2798 se_sess); 2799 if (!pr_reg_n) { 2800 pr_err("SPC-3 PR: Unable to locate" 2801 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2802 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2803 return TCM_RESERVATION_CONFLICT; 2804 } 2805 if (pr_reg_n->pr_res_key != res_key) { 2806 core_scsi3_put_pr_reg(pr_reg_n); 2807 return TCM_RESERVATION_CONFLICT; 2808 } 2809 if (scope != PR_SCOPE_LU_SCOPE) { 2810 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2811 core_scsi3_put_pr_reg(pr_reg_n); 2812 return TCM_INVALID_PARAMETER_LIST; 2813 } 2814 2815 spin_lock(&dev->dev_reservation_lock); 2816 pr_res_holder = dev->dev_pr_res_holder; 2817 if (pr_res_holder && 2818 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2819 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2820 all_reg = 1; 2821 2822 if (!all_reg && !sa_res_key) { 2823 spin_unlock(&dev->dev_reservation_lock); 2824 core_scsi3_put_pr_reg(pr_reg_n); 2825 return TCM_INVALID_PARAMETER_LIST; 2826 } 2827 /* 2828 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2829 * 2830 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2831 * persistent reservation holder or there is no persistent reservation 2832 * holder (i.e., there is no persistent reservation), then the device 2833 * server shall perform a preempt by doing the following in an 2834 * uninterrupted series of actions. (See below..) 2835 */ 2836 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2837 /* 2838 * No existing or SA Reservation Key matching reservations.. 2839 * 2840 * PROUT SA PREEMPT with All Registrant type reservations are 2841 * allowed to be processed without a matching SA Reservation Key 2842 */ 2843 spin_lock(&pr_tmpl->registration_lock); 2844 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2845 &pr_tmpl->registration_list, pr_reg_list) { 2846 /* 2847 * Removing of registrations in non all registrants 2848 * type reservations without a matching SA reservation 2849 * key. 2850 * 2851 * a) Remove the registrations for all I_T nexuses 2852 * specified by the SERVICE ACTION RESERVATION KEY 2853 * field; 2854 * b) Ignore the contents of the SCOPE and TYPE fields; 2855 * c) Process tasks as defined in 5.7.1; and 2856 * d) Establish a unit attention condition for the 2857 * initiator port associated with every I_T nexus 2858 * that lost its registration other than the I_T 2859 * nexus on which the PERSISTENT RESERVE OUT command 2860 * was received, with the additional sense code set 2861 * to REGISTRATIONS PREEMPTED. 2862 */ 2863 if (!all_reg) { 2864 if (pr_reg->pr_res_key != sa_res_key) 2865 continue; 2866 sa_res_key_unmatched = false; 2867 2868 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2869 pr_reg_nacl = pr_reg->pr_reg_nacl; 2870 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2871 __core_scsi3_free_registration(dev, pr_reg, 2872 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2873 NULL, calling_it_nexus); 2874 } else { 2875 /* 2876 * Case for any existing all registrants type 2877 * reservation, follow logic in spc4r17 section 2878 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2879 * 2880 * For a ZERO SA Reservation key, release 2881 * all other registrations and do an implicit 2882 * release of active persistent reservation. 2883 * 2884 * For a non-ZERO SA Reservation key, only 2885 * release the matching reservation key from 2886 * registrations. 2887 */ 2888 if ((sa_res_key) && 2889 (pr_reg->pr_res_key != sa_res_key)) 2890 continue; 2891 sa_res_key_unmatched = false; 2892 2893 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2894 if (calling_it_nexus) 2895 continue; 2896 2897 pr_reg_nacl = pr_reg->pr_reg_nacl; 2898 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2899 __core_scsi3_free_registration(dev, pr_reg, 2900 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2901 NULL, 0); 2902 } 2903 if (!calling_it_nexus) 2904 core_scsi3_ua_allocate(pr_reg_nacl, 2905 pr_res_mapped_lun, 0x2A, 2906 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2907 } 2908 spin_unlock(&pr_tmpl->registration_lock); 2909 /* 2910 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2911 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2912 * RESERVATION KEY field to a value that does not match any 2913 * registered reservation key, then the device server shall 2914 * complete the command with RESERVATION CONFLICT status. 2915 */ 2916 if (sa_res_key_unmatched) { 2917 spin_unlock(&dev->dev_reservation_lock); 2918 core_scsi3_put_pr_reg(pr_reg_n); 2919 return TCM_RESERVATION_CONFLICT; 2920 } 2921 /* 2922 * For an existing all registrants type reservation 2923 * with a zero SA rservation key, preempt the existing 2924 * reservation with the new PR type and scope. 2925 */ 2926 if (pr_res_holder && all_reg && !(sa_res_key)) { 2927 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2928 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2929 type, scope, preempt_type); 2930 2931 if (preempt_type == PREEMPT_AND_ABORT) 2932 core_scsi3_release_preempt_and_abort( 2933 &preempt_and_abort_list, pr_reg_n); 2934 } 2935 spin_unlock(&dev->dev_reservation_lock); 2936 2937 if (pr_tmpl->pr_aptpl_active) 2938 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2939 2940 core_scsi3_put_pr_reg(pr_reg_n); 2941 core_scsi3_pr_generation(cmd->se_dev); 2942 return 0; 2943 } 2944 /* 2945 * The PREEMPTing SA reservation key matches that of the 2946 * existing persistent reservation, first, we check if 2947 * we are preempting our own reservation. 2948 * From spc4r17, section 5.7.11.4.3 Preempting 2949 * persistent reservations and registration handling 2950 * 2951 * If an all registrants persistent reservation is not 2952 * present, it is not an error for the persistent 2953 * reservation holder to preempt itself (i.e., a 2954 * PERSISTENT RESERVE OUT with a PREEMPT service action 2955 * or a PREEMPT AND ABORT service action with the 2956 * SERVICE ACTION RESERVATION KEY value equal to the 2957 * persistent reservation holder's reservation key that 2958 * is received from the persistent reservation holder). 2959 * In that case, the device server shall establish the 2960 * new persistent reservation and maintain the 2961 * registration. 2962 */ 2963 prh_type = pr_res_holder->pr_res_type; 2964 prh_scope = pr_res_holder->pr_res_scope; 2965 /* 2966 * If the SERVICE ACTION RESERVATION KEY field identifies a 2967 * persistent reservation holder (see 5.7.10), the device 2968 * server shall perform a preempt by doing the following as 2969 * an uninterrupted series of actions: 2970 * 2971 * a) Release the persistent reservation for the holder 2972 * identified by the SERVICE ACTION RESERVATION KEY field; 2973 */ 2974 if (pr_reg_n != pr_res_holder) 2975 __core_scsi3_complete_pro_release(dev, 2976 pr_res_holder->pr_reg_nacl, 2977 dev->dev_pr_res_holder, 0, 0); 2978 /* 2979 * b) Remove the registrations for all I_T nexuses identified 2980 * by the SERVICE ACTION RESERVATION KEY field, except the 2981 * I_T nexus that is being used for the PERSISTENT RESERVE 2982 * OUT command. If an all registrants persistent reservation 2983 * is present and the SERVICE ACTION RESERVATION KEY field 2984 * is set to zero, then all registrations shall be removed 2985 * except for that of the I_T nexus that is being used for 2986 * the PERSISTENT RESERVE OUT command; 2987 */ 2988 spin_lock(&pr_tmpl->registration_lock); 2989 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2990 &pr_tmpl->registration_list, pr_reg_list) { 2991 2992 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2993 if (calling_it_nexus) 2994 continue; 2995 2996 if (pr_reg->pr_res_key != sa_res_key) 2997 continue; 2998 2999 pr_reg_nacl = pr_reg->pr_reg_nacl; 3000 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3001 __core_scsi3_free_registration(dev, pr_reg, 3002 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3003 calling_it_nexus); 3004 /* 3005 * e) Establish a unit attention condition for the initiator 3006 * port associated with every I_T nexus that lost its 3007 * persistent reservation and/or registration, with the 3008 * additional sense code set to REGISTRATIONS PREEMPTED; 3009 */ 3010 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3011 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3012 } 3013 spin_unlock(&pr_tmpl->registration_lock); 3014 /* 3015 * c) Establish a persistent reservation for the preempting 3016 * I_T nexus using the contents of the SCOPE and TYPE fields; 3017 */ 3018 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3019 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3020 type, scope, preempt_type); 3021 /* 3022 * d) Process tasks as defined in 5.7.1; 3023 * e) See above.. 3024 * f) If the type or scope has changed, then for every I_T nexus 3025 * whose reservation key was not removed, except for the I_T 3026 * nexus on which the PERSISTENT RESERVE OUT command was 3027 * received, the device server shall establish a unit 3028 * attention condition for the initiator port associated with 3029 * that I_T nexus, with the additional sense code set to 3030 * RESERVATIONS RELEASED. If the type or scope have not 3031 * changed, then no unit attention condition(s) shall be 3032 * established for this reason. 3033 */ 3034 if ((prh_type != type) || (prh_scope != scope)) { 3035 spin_lock(&pr_tmpl->registration_lock); 3036 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3037 &pr_tmpl->registration_list, pr_reg_list) { 3038 3039 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3040 if (calling_it_nexus) 3041 continue; 3042 3043 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3044 pr_reg->pr_res_mapped_lun, 0x2A, 3045 ASCQ_2AH_RESERVATIONS_RELEASED); 3046 } 3047 spin_unlock(&pr_tmpl->registration_lock); 3048 } 3049 spin_unlock(&dev->dev_reservation_lock); 3050 /* 3051 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3052 * All received CDBs for the matching existing reservation and 3053 * registrations undergo ABORT_TASK logic. 3054 * 3055 * From there, core_scsi3_release_preempt_and_abort() will 3056 * release every registration in the list (which have already 3057 * been removed from the primary pr_reg list), except the 3058 * new persistent reservation holder, the calling Initiator Port. 3059 */ 3060 if (preempt_type == PREEMPT_AND_ABORT) { 3061 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3062 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3063 pr_reg_n); 3064 } 3065 3066 if (pr_tmpl->pr_aptpl_active) 3067 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3068 3069 core_scsi3_put_pr_reg(pr_reg_n); 3070 core_scsi3_pr_generation(cmd->se_dev); 3071 return 0; 3072 } 3073 3074 static sense_reason_t 3075 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3076 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3077 { 3078 switch (type) { 3079 case PR_TYPE_WRITE_EXCLUSIVE: 3080 case PR_TYPE_EXCLUSIVE_ACCESS: 3081 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3082 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3083 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3084 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3085 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3086 sa_res_key, preempt_type); 3087 default: 3088 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3089 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3090 return TCM_INVALID_CDB_FIELD; 3091 } 3092 } 3093 3094 3095 static sense_reason_t 3096 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3097 u64 sa_res_key, int aptpl, int unreg) 3098 { 3099 struct se_session *se_sess = cmd->se_sess; 3100 struct se_device *dev = cmd->se_dev; 3101 struct se_dev_entry *dest_se_deve = NULL; 3102 struct se_lun *se_lun = cmd->se_lun; 3103 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3104 struct se_port *se_port; 3105 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3106 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3107 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3108 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3109 unsigned char *buf; 3110 unsigned char *initiator_str; 3111 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3112 u32 tid_len, tmp_tid_len; 3113 int new_reg = 0, type, scope, matching_iname; 3114 sense_reason_t ret; 3115 unsigned short rtpi; 3116 unsigned char proto_ident; 3117 3118 if (!se_sess || !se_lun) { 3119 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3120 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3121 } 3122 3123 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3124 se_tpg = se_sess->se_tpg; 3125 tf_ops = se_tpg->se_tpg_tfo; 3126 /* 3127 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3128 * Register behaviors for a REGISTER AND MOVE service action 3129 * 3130 * Locate the existing *pr_reg via struct se_node_acl pointers 3131 */ 3132 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3133 se_sess); 3134 if (!pr_reg) { 3135 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3136 " *pr_reg for REGISTER_AND_MOVE\n"); 3137 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3138 } 3139 /* 3140 * The provided reservation key much match the existing reservation key 3141 * provided during this initiator's I_T nexus registration. 3142 */ 3143 if (res_key != pr_reg->pr_res_key) { 3144 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3145 " res_key: 0x%016Lx does not match existing SA REGISTER" 3146 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3147 ret = TCM_RESERVATION_CONFLICT; 3148 goto out_put_pr_reg; 3149 } 3150 /* 3151 * The service active reservation key needs to be non zero 3152 */ 3153 if (!sa_res_key) { 3154 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3155 " sa_res_key\n"); 3156 ret = TCM_INVALID_PARAMETER_LIST; 3157 goto out_put_pr_reg; 3158 } 3159 3160 /* 3161 * Determine the Relative Target Port Identifier where the reservation 3162 * will be moved to for the TransportID containing SCSI initiator WWN 3163 * information. 3164 */ 3165 buf = transport_kmap_data_sg(cmd); 3166 if (!buf) { 3167 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3168 goto out_put_pr_reg; 3169 } 3170 3171 rtpi = (buf[18] & 0xff) << 8; 3172 rtpi |= buf[19] & 0xff; 3173 tid_len = (buf[20] & 0xff) << 24; 3174 tid_len |= (buf[21] & 0xff) << 16; 3175 tid_len |= (buf[22] & 0xff) << 8; 3176 tid_len |= buf[23] & 0xff; 3177 transport_kunmap_data_sg(cmd); 3178 buf = NULL; 3179 3180 if ((tid_len + 24) != cmd->data_length) { 3181 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3182 " does not equal CDB data_length: %u\n", tid_len, 3183 cmd->data_length); 3184 ret = TCM_INVALID_PARAMETER_LIST; 3185 goto out_put_pr_reg; 3186 } 3187 3188 spin_lock(&dev->se_port_lock); 3189 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3190 if (se_port->sep_rtpi != rtpi) 3191 continue; 3192 dest_se_tpg = se_port->sep_tpg; 3193 if (!dest_se_tpg) 3194 continue; 3195 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3196 if (!dest_tf_ops) 3197 continue; 3198 3199 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3200 spin_unlock(&dev->se_port_lock); 3201 3202 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3203 pr_err("core_scsi3_tpg_depend_item() failed" 3204 " for dest_se_tpg\n"); 3205 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3206 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3207 goto out_put_pr_reg; 3208 } 3209 3210 spin_lock(&dev->se_port_lock); 3211 break; 3212 } 3213 spin_unlock(&dev->se_port_lock); 3214 3215 if (!dest_se_tpg || !dest_tf_ops) { 3216 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3217 " fabric ops from Relative Target Port Identifier:" 3218 " %hu\n", rtpi); 3219 ret = TCM_INVALID_PARAMETER_LIST; 3220 goto out_put_pr_reg; 3221 } 3222 3223 buf = transport_kmap_data_sg(cmd); 3224 if (!buf) { 3225 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3226 goto out_put_pr_reg; 3227 } 3228 proto_ident = (buf[24] & 0x0f); 3229 3230 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3231 " 0x%02x\n", proto_ident); 3232 3233 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3234 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3235 " proto_ident: 0x%02x does not match ident: 0x%02x" 3236 " from fabric: %s\n", proto_ident, 3237 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3238 dest_tf_ops->get_fabric_name()); 3239 ret = TCM_INVALID_PARAMETER_LIST; 3240 goto out; 3241 } 3242 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3243 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3244 " containg a valid tpg_parse_pr_out_transport_id" 3245 " function pointer\n"); 3246 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3247 goto out; 3248 } 3249 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3250 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3251 if (!initiator_str) { 3252 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3253 " initiator_str from Transport ID\n"); 3254 ret = TCM_INVALID_PARAMETER_LIST; 3255 goto out; 3256 } 3257 3258 transport_kunmap_data_sg(cmd); 3259 buf = NULL; 3260 3261 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3262 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3263 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3264 iport_ptr : ""); 3265 /* 3266 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3267 * action specifies a TransportID that is the same as the initiator port 3268 * of the I_T nexus for the command received, then the command shall 3269 * be terminated with CHECK CONDITION status, with the sense key set to 3270 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3271 * IN PARAMETER LIST. 3272 */ 3273 pr_reg_nacl = pr_reg->pr_reg_nacl; 3274 matching_iname = (!strcmp(initiator_str, 3275 pr_reg_nacl->initiatorname)) ? 1 : 0; 3276 if (!matching_iname) 3277 goto after_iport_check; 3278 3279 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3280 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3281 " matches: %s on received I_T Nexus\n", initiator_str, 3282 pr_reg_nacl->initiatorname); 3283 ret = TCM_INVALID_PARAMETER_LIST; 3284 goto out; 3285 } 3286 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3287 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3288 " matches: %s %s on received I_T Nexus\n", 3289 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3290 pr_reg->pr_reg_isid); 3291 ret = TCM_INVALID_PARAMETER_LIST; 3292 goto out; 3293 } 3294 after_iport_check: 3295 /* 3296 * Locate the destination struct se_node_acl from the received Transport ID 3297 */ 3298 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3299 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3300 initiator_str); 3301 if (dest_node_acl) 3302 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3303 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3304 3305 if (!dest_node_acl) { 3306 pr_err("Unable to locate %s dest_node_acl for" 3307 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3308 initiator_str); 3309 ret = TCM_INVALID_PARAMETER_LIST; 3310 goto out; 3311 } 3312 3313 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3314 pr_err("core_scsi3_nodeacl_depend_item() for" 3315 " dest_node_acl\n"); 3316 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3317 dest_node_acl = NULL; 3318 ret = TCM_INVALID_PARAMETER_LIST; 3319 goto out; 3320 } 3321 3322 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3323 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3324 dest_node_acl->initiatorname); 3325 3326 /* 3327 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3328 * PORT IDENTIFIER. 3329 */ 3330 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3331 if (!dest_se_deve) { 3332 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3333 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3334 ret = TCM_INVALID_PARAMETER_LIST; 3335 goto out; 3336 } 3337 3338 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3339 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3340 atomic_dec_mb(&dest_se_deve->pr_ref_count); 3341 dest_se_deve = NULL; 3342 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3343 goto out; 3344 } 3345 3346 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3347 " ACL for dest_se_deve->mapped_lun: %u\n", 3348 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3349 dest_se_deve->mapped_lun); 3350 3351 /* 3352 * A persistent reservation needs to already existing in order to 3353 * successfully complete the REGISTER_AND_MOVE service action.. 3354 */ 3355 spin_lock(&dev->dev_reservation_lock); 3356 pr_res_holder = dev->dev_pr_res_holder; 3357 if (!pr_res_holder) { 3358 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3359 " currently held\n"); 3360 spin_unlock(&dev->dev_reservation_lock); 3361 ret = TCM_INVALID_CDB_FIELD; 3362 goto out; 3363 } 3364 /* 3365 * The received on I_T Nexus must be the reservation holder. 3366 * 3367 * From spc4r17 section 5.7.8 Table 50 -- 3368 * Register behaviors for a REGISTER AND MOVE service action 3369 */ 3370 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3371 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3372 " Nexus is not reservation holder\n"); 3373 spin_unlock(&dev->dev_reservation_lock); 3374 ret = TCM_RESERVATION_CONFLICT; 3375 goto out; 3376 } 3377 /* 3378 * From spc4r17 section 5.7.8: registering and moving reservation 3379 * 3380 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3381 * action is received and the established persistent reservation is a 3382 * Write Exclusive - All Registrants type or Exclusive Access - 3383 * All Registrants type reservation, then the command shall be completed 3384 * with RESERVATION CONFLICT status. 3385 */ 3386 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3387 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3388 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3389 " reservation for type: %s\n", 3390 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3391 spin_unlock(&dev->dev_reservation_lock); 3392 ret = TCM_RESERVATION_CONFLICT; 3393 goto out; 3394 } 3395 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3396 /* 3397 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3398 */ 3399 type = pr_res_holder->pr_res_type; 3400 scope = pr_res_holder->pr_res_type; 3401 /* 3402 * c) Associate the reservation key specified in the SERVICE ACTION 3403 * RESERVATION KEY field with the I_T nexus specified as the 3404 * destination of the register and move, where: 3405 * A) The I_T nexus is specified by the TransportID and the 3406 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3407 * B) Regardless of the TransportID format used, the association for 3408 * the initiator port is based on either the initiator port name 3409 * (see 3.1.71) on SCSI transport protocols where port names are 3410 * required or the initiator port identifier (see 3.1.70) on SCSI 3411 * transport protocols where port names are not required; 3412 * d) Register the reservation key specified in the SERVICE ACTION 3413 * RESERVATION KEY field; 3414 * e) Retain the reservation key specified in the SERVICE ACTION 3415 * RESERVATION KEY field and associated information; 3416 * 3417 * Also, It is not an error for a REGISTER AND MOVE service action to 3418 * register an I_T nexus that is already registered with the same 3419 * reservation key or a different reservation key. 3420 */ 3421 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3422 iport_ptr); 3423 if (!dest_pr_reg) { 3424 if (core_scsi3_alloc_registration(cmd->se_dev, 3425 dest_node_acl, dest_se_deve, iport_ptr, 3426 sa_res_key, 0, aptpl, 2, 1)) { 3427 spin_unlock(&dev->dev_reservation_lock); 3428 ret = TCM_INVALID_PARAMETER_LIST; 3429 goto out; 3430 } 3431 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3432 iport_ptr); 3433 new_reg = 1; 3434 } 3435 /* 3436 * f) Release the persistent reservation for the persistent reservation 3437 * holder (i.e., the I_T nexus on which the 3438 */ 3439 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3440 dev->dev_pr_res_holder, 0, 0); 3441 /* 3442 * g) Move the persistent reservation to the specified I_T nexus using 3443 * the same scope and type as the persistent reservation released in 3444 * item f); and 3445 */ 3446 dev->dev_pr_res_holder = dest_pr_reg; 3447 dest_pr_reg->pr_res_holder = 1; 3448 dest_pr_reg->pr_res_type = type; 3449 pr_reg->pr_res_scope = scope; 3450 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3451 /* 3452 * Increment PRGeneration for existing registrations.. 3453 */ 3454 if (!new_reg) 3455 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3456 spin_unlock(&dev->dev_reservation_lock); 3457 3458 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3459 " created new reservation holder TYPE: %s on object RTPI:" 3460 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3461 core_scsi3_pr_dump_type(type), rtpi, 3462 dest_pr_reg->pr_res_generation); 3463 pr_debug("SPC-3 PR Successfully moved reservation from" 3464 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3465 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3466 i_buf, dest_tf_ops->get_fabric_name(), 3467 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3468 iport_ptr : ""); 3469 /* 3470 * It is now safe to release configfs group dependencies for destination 3471 * of Transport ID Initiator Device/Port Identifier 3472 */ 3473 core_scsi3_lunacl_undepend_item(dest_se_deve); 3474 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3475 core_scsi3_tpg_undepend_item(dest_se_tpg); 3476 /* 3477 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3478 * nexus on which PERSISTENT RESERVE OUT command was received. 3479 */ 3480 if (unreg) { 3481 spin_lock(&pr_tmpl->registration_lock); 3482 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3483 spin_unlock(&pr_tmpl->registration_lock); 3484 } else 3485 core_scsi3_put_pr_reg(pr_reg); 3486 3487 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3488 3489 transport_kunmap_data_sg(cmd); 3490 3491 core_scsi3_put_pr_reg(dest_pr_reg); 3492 return 0; 3493 out: 3494 if (buf) 3495 transport_kunmap_data_sg(cmd); 3496 if (dest_se_deve) 3497 core_scsi3_lunacl_undepend_item(dest_se_deve); 3498 if (dest_node_acl) 3499 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3500 core_scsi3_tpg_undepend_item(dest_se_tpg); 3501 3502 out_put_pr_reg: 3503 core_scsi3_put_pr_reg(pr_reg); 3504 return ret; 3505 } 3506 3507 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3508 { 3509 unsigned int __v1, __v2; 3510 3511 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3512 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3513 3514 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3515 } 3516 3517 /* 3518 * See spc4r17 section 6.14 Table 170 3519 */ 3520 sense_reason_t 3521 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3522 { 3523 struct se_device *dev = cmd->se_dev; 3524 unsigned char *cdb = &cmd->t_task_cdb[0]; 3525 unsigned char *buf; 3526 u64 res_key, sa_res_key; 3527 int sa, scope, type, aptpl; 3528 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3529 sense_reason_t ret; 3530 3531 /* 3532 * Following spc2r20 5.5.1 Reservations overview: 3533 * 3534 * If a logical unit has been reserved by any RESERVE command and is 3535 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3536 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3537 * initiator or service action and shall terminate with a RESERVATION 3538 * CONFLICT status. 3539 */ 3540 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3541 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3542 " SPC-2 reservation is held, returning" 3543 " RESERVATION_CONFLICT\n"); 3544 return TCM_RESERVATION_CONFLICT; 3545 } 3546 3547 /* 3548 * FIXME: A NULL struct se_session pointer means an this is not coming from 3549 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3550 */ 3551 if (!cmd->se_sess) 3552 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3553 3554 if (cmd->data_length < 24) { 3555 pr_warn("SPC-PR: Received PR OUT parameter list" 3556 " length too small: %u\n", cmd->data_length); 3557 return TCM_INVALID_PARAMETER_LIST; 3558 } 3559 3560 /* 3561 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3562 */ 3563 sa = (cdb[1] & 0x1f); 3564 scope = (cdb[2] & 0xf0); 3565 type = (cdb[2] & 0x0f); 3566 3567 buf = transport_kmap_data_sg(cmd); 3568 if (!buf) 3569 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3570 3571 /* 3572 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3573 */ 3574 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3575 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3576 /* 3577 * REGISTER_AND_MOVE uses a different SA parameter list containing 3578 * SCSI TransportIDs. 3579 */ 3580 if (sa != PRO_REGISTER_AND_MOVE) { 3581 spec_i_pt = (buf[20] & 0x08); 3582 all_tg_pt = (buf[20] & 0x04); 3583 aptpl = (buf[20] & 0x01); 3584 } else { 3585 aptpl = (buf[17] & 0x01); 3586 unreg = (buf[17] & 0x02); 3587 } 3588 /* 3589 * If the backend device has been configured to force APTPL metadata 3590 * write-out, go ahead and propigate aptpl=1 down now. 3591 */ 3592 if (dev->dev_attrib.force_pr_aptpl) 3593 aptpl = 1; 3594 3595 transport_kunmap_data_sg(cmd); 3596 buf = NULL; 3597 3598 /* 3599 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3600 */ 3601 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3602 return TCM_INVALID_PARAMETER_LIST; 3603 3604 /* 3605 * From spc4r17 section 6.14: 3606 * 3607 * If the SPEC_I_PT bit is set to zero, the service action is not 3608 * REGISTER AND MOVE, and the parameter list length is not 24, then 3609 * the command shall be terminated with CHECK CONDITION status, with 3610 * the sense key set to ILLEGAL REQUEST, and the additional sense 3611 * code set to PARAMETER LIST LENGTH ERROR. 3612 */ 3613 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3614 (cmd->data_length != 24)) { 3615 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3616 " list length: %u\n", cmd->data_length); 3617 return TCM_INVALID_PARAMETER_LIST; 3618 } 3619 3620 /* 3621 * (core_scsi3_emulate_pro_* function parameters 3622 * are defined by spc4r17 Table 174: 3623 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3624 */ 3625 switch (sa) { 3626 case PRO_REGISTER: 3627 ret = core_scsi3_emulate_pro_register(cmd, 3628 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3629 break; 3630 case PRO_RESERVE: 3631 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3632 break; 3633 case PRO_RELEASE: 3634 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3635 break; 3636 case PRO_CLEAR: 3637 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3638 break; 3639 case PRO_PREEMPT: 3640 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3641 res_key, sa_res_key, PREEMPT); 3642 break; 3643 case PRO_PREEMPT_AND_ABORT: 3644 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3645 res_key, sa_res_key, PREEMPT_AND_ABORT); 3646 break; 3647 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3648 ret = core_scsi3_emulate_pro_register(cmd, 3649 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3650 break; 3651 case PRO_REGISTER_AND_MOVE: 3652 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3653 sa_res_key, aptpl, unreg); 3654 break; 3655 default: 3656 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3657 " action: 0x%02x\n", cdb[1] & 0x1f); 3658 return TCM_INVALID_CDB_FIELD; 3659 } 3660 3661 if (!ret) 3662 target_complete_cmd(cmd, GOOD); 3663 return ret; 3664 } 3665 3666 /* 3667 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3668 * 3669 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3670 */ 3671 static sense_reason_t 3672 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3673 { 3674 struct se_device *dev = cmd->se_dev; 3675 struct t10_pr_registration *pr_reg; 3676 unsigned char *buf; 3677 u32 add_len = 0, off = 8; 3678 3679 if (cmd->data_length < 8) { 3680 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3681 " too small\n", cmd->data_length); 3682 return TCM_INVALID_CDB_FIELD; 3683 } 3684 3685 buf = transport_kmap_data_sg(cmd); 3686 if (!buf) 3687 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3688 3689 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3690 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3691 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3692 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3693 3694 spin_lock(&dev->t10_pr.registration_lock); 3695 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3696 pr_reg_list) { 3697 /* 3698 * Check for overflow of 8byte PRI READ_KEYS payload and 3699 * next reservation key list descriptor. 3700 */ 3701 if ((add_len + 8) > (cmd->data_length - 8)) 3702 break; 3703 3704 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3705 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3706 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3707 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3708 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3709 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3710 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3711 buf[off++] = (pr_reg->pr_res_key & 0xff); 3712 3713 add_len += 8; 3714 } 3715 spin_unlock(&dev->t10_pr.registration_lock); 3716 3717 buf[4] = ((add_len >> 24) & 0xff); 3718 buf[5] = ((add_len >> 16) & 0xff); 3719 buf[6] = ((add_len >> 8) & 0xff); 3720 buf[7] = (add_len & 0xff); 3721 3722 transport_kunmap_data_sg(cmd); 3723 3724 return 0; 3725 } 3726 3727 /* 3728 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3729 * 3730 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3731 */ 3732 static sense_reason_t 3733 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3734 { 3735 struct se_device *dev = cmd->se_dev; 3736 struct t10_pr_registration *pr_reg; 3737 unsigned char *buf; 3738 u64 pr_res_key; 3739 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3740 3741 if (cmd->data_length < 8) { 3742 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3743 " too small\n", cmd->data_length); 3744 return TCM_INVALID_CDB_FIELD; 3745 } 3746 3747 buf = transport_kmap_data_sg(cmd); 3748 if (!buf) 3749 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3750 3751 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3752 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3753 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3754 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3755 3756 spin_lock(&dev->dev_reservation_lock); 3757 pr_reg = dev->dev_pr_res_holder; 3758 if (pr_reg) { 3759 /* 3760 * Set the hardcoded Additional Length 3761 */ 3762 buf[4] = ((add_len >> 24) & 0xff); 3763 buf[5] = ((add_len >> 16) & 0xff); 3764 buf[6] = ((add_len >> 8) & 0xff); 3765 buf[7] = (add_len & 0xff); 3766 3767 if (cmd->data_length < 22) 3768 goto err; 3769 3770 /* 3771 * Set the Reservation key. 3772 * 3773 * From spc4r17, section 5.7.10: 3774 * A persistent reservation holder has its reservation key 3775 * returned in the parameter data from a PERSISTENT 3776 * RESERVE IN command with READ RESERVATION service action as 3777 * follows: 3778 * a) For a persistent reservation of the type Write Exclusive 3779 * - All Registrants or Exclusive Access All Regitrants, 3780 * the reservation key shall be set to zero; or 3781 * b) For all other persistent reservation types, the 3782 * reservation key shall be set to the registered 3783 * reservation key for the I_T nexus that holds the 3784 * persistent reservation. 3785 */ 3786 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3787 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3788 pr_res_key = 0; 3789 else 3790 pr_res_key = pr_reg->pr_res_key; 3791 3792 buf[8] = ((pr_res_key >> 56) & 0xff); 3793 buf[9] = ((pr_res_key >> 48) & 0xff); 3794 buf[10] = ((pr_res_key >> 40) & 0xff); 3795 buf[11] = ((pr_res_key >> 32) & 0xff); 3796 buf[12] = ((pr_res_key >> 24) & 0xff); 3797 buf[13] = ((pr_res_key >> 16) & 0xff); 3798 buf[14] = ((pr_res_key >> 8) & 0xff); 3799 buf[15] = (pr_res_key & 0xff); 3800 /* 3801 * Set the SCOPE and TYPE 3802 */ 3803 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3804 (pr_reg->pr_res_type & 0x0f); 3805 } 3806 3807 err: 3808 spin_unlock(&dev->dev_reservation_lock); 3809 transport_kunmap_data_sg(cmd); 3810 3811 return 0; 3812 } 3813 3814 /* 3815 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3816 * 3817 * See spc4r17 section 6.13.4 Table 165 3818 */ 3819 static sense_reason_t 3820 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3821 { 3822 struct se_device *dev = cmd->se_dev; 3823 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3824 unsigned char *buf; 3825 u16 add_len = 8; /* Hardcoded to 8. */ 3826 3827 if (cmd->data_length < 6) { 3828 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3829 " %u too small\n", cmd->data_length); 3830 return TCM_INVALID_CDB_FIELD; 3831 } 3832 3833 buf = transport_kmap_data_sg(cmd); 3834 if (!buf) 3835 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3836 3837 buf[0] = ((add_len >> 8) & 0xff); 3838 buf[1] = (add_len & 0xff); 3839 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3840 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3841 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3842 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3843 /* 3844 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3845 * set the TMV: Task Mask Valid bit. 3846 */ 3847 buf[3] |= 0x80; 3848 /* 3849 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3850 */ 3851 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3852 /* 3853 * PTPL_A: Persistence across Target Power Loss Active bit 3854 */ 3855 if (pr_tmpl->pr_aptpl_active) 3856 buf[3] |= 0x01; 3857 /* 3858 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3859 */ 3860 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3861 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3862 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3863 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3864 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3865 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3866 3867 transport_kunmap_data_sg(cmd); 3868 3869 return 0; 3870 } 3871 3872 /* 3873 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3874 * 3875 * See spc4r17 section 6.13.5 Table 168 and 169 3876 */ 3877 static sense_reason_t 3878 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3879 { 3880 struct se_device *dev = cmd->se_dev; 3881 struct se_node_acl *se_nacl; 3882 struct se_portal_group *se_tpg; 3883 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3884 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3885 unsigned char *buf; 3886 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3887 u32 off = 8; /* off into first Full Status descriptor */ 3888 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3889 bool all_reg = false; 3890 3891 if (cmd->data_length < 8) { 3892 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3893 " too small\n", cmd->data_length); 3894 return TCM_INVALID_CDB_FIELD; 3895 } 3896 3897 buf = transport_kmap_data_sg(cmd); 3898 if (!buf) 3899 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3900 3901 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3902 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3903 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3904 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3905 3906 spin_lock(&dev->dev_reservation_lock); 3907 if (dev->dev_pr_res_holder) { 3908 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3909 3910 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3911 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3912 all_reg = true; 3913 pr_res_type = pr_holder->pr_res_type; 3914 pr_res_scope = pr_holder->pr_res_scope; 3915 } 3916 } 3917 spin_unlock(&dev->dev_reservation_lock); 3918 3919 spin_lock(&pr_tmpl->registration_lock); 3920 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3921 &pr_tmpl->registration_list, pr_reg_list) { 3922 3923 se_nacl = pr_reg->pr_reg_nacl; 3924 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3925 add_desc_len = 0; 3926 3927 atomic_inc_mb(&pr_reg->pr_res_holders); 3928 spin_unlock(&pr_tmpl->registration_lock); 3929 /* 3930 * Determine expected length of $FABRIC_MOD specific 3931 * TransportID full status descriptor.. 3932 */ 3933 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3934 se_tpg, se_nacl, pr_reg, &format_code); 3935 3936 if ((exp_desc_len + add_len) > cmd->data_length) { 3937 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3938 " out of buffer: %d\n", cmd->data_length); 3939 spin_lock(&pr_tmpl->registration_lock); 3940 atomic_dec_mb(&pr_reg->pr_res_holders); 3941 break; 3942 } 3943 /* 3944 * Set RESERVATION KEY 3945 */ 3946 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3947 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3948 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3949 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3950 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3951 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3952 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3953 buf[off++] = (pr_reg->pr_res_key & 0xff); 3954 off += 4; /* Skip Over Reserved area */ 3955 3956 /* 3957 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3958 */ 3959 if (pr_reg->pr_reg_all_tg_pt) 3960 buf[off] = 0x02; 3961 /* 3962 * The struct se_lun pointer will be present for the 3963 * reservation holder for PR_HOLDER bit. 3964 * 3965 * Also, if this registration is the reservation 3966 * holder or there is an All Registrants reservation 3967 * active, fill in SCOPE and TYPE in the next byte. 3968 */ 3969 if (pr_reg->pr_res_holder) { 3970 buf[off++] |= 0x01; 3971 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3972 (pr_reg->pr_res_type & 0x0f); 3973 } else if (all_reg) { 3974 buf[off++] |= 0x01; 3975 buf[off++] = (pr_res_scope & 0xf0) | 3976 (pr_res_type & 0x0f); 3977 } else { 3978 off += 2; 3979 } 3980 3981 off += 4; /* Skip over reserved area */ 3982 /* 3983 * From spc4r17 6.3.15: 3984 * 3985 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3986 * IDENTIFIER field contains the relative port identifier (see 3987 * 3.1.120) of the target port that is part of the I_T nexus 3988 * described by this full status descriptor. If the ALL_TG_PT 3989 * bit is set to one, the contents of the RELATIVE TARGET PORT 3990 * IDENTIFIER field are not defined by this standard. 3991 */ 3992 if (!pr_reg->pr_reg_all_tg_pt) { 3993 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 3994 3995 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 3996 buf[off++] = (port->sep_rtpi & 0xff); 3997 } else 3998 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3999 4000 /* 4001 * Now, have the $FABRIC_MOD fill in the protocol identifier 4002 */ 4003 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4004 se_nacl, pr_reg, &format_code, &buf[off+4]); 4005 4006 spin_lock(&pr_tmpl->registration_lock); 4007 atomic_dec_mb(&pr_reg->pr_res_holders); 4008 /* 4009 * Set the ADDITIONAL DESCRIPTOR LENGTH 4010 */ 4011 buf[off++] = ((desc_len >> 24) & 0xff); 4012 buf[off++] = ((desc_len >> 16) & 0xff); 4013 buf[off++] = ((desc_len >> 8) & 0xff); 4014 buf[off++] = (desc_len & 0xff); 4015 /* 4016 * Size of full desctipor header minus TransportID 4017 * containing $FABRIC_MOD specific) initiator device/port 4018 * WWN information. 4019 * 4020 * See spc4r17 Section 6.13.5 Table 169 4021 */ 4022 add_desc_len = (24 + desc_len); 4023 4024 off += desc_len; 4025 add_len += add_desc_len; 4026 } 4027 spin_unlock(&pr_tmpl->registration_lock); 4028 /* 4029 * Set ADDITIONAL_LENGTH 4030 */ 4031 buf[4] = ((add_len >> 24) & 0xff); 4032 buf[5] = ((add_len >> 16) & 0xff); 4033 buf[6] = ((add_len >> 8) & 0xff); 4034 buf[7] = (add_len & 0xff); 4035 4036 transport_kunmap_data_sg(cmd); 4037 4038 return 0; 4039 } 4040 4041 sense_reason_t 4042 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4043 { 4044 sense_reason_t ret; 4045 4046 /* 4047 * Following spc2r20 5.5.1 Reservations overview: 4048 * 4049 * If a logical unit has been reserved by any RESERVE command and is 4050 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4051 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4052 * initiator or service action and shall terminate with a RESERVATION 4053 * CONFLICT status. 4054 */ 4055 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4056 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4057 " SPC-2 reservation is held, returning" 4058 " RESERVATION_CONFLICT\n"); 4059 return TCM_RESERVATION_CONFLICT; 4060 } 4061 4062 switch (cmd->t_task_cdb[1] & 0x1f) { 4063 case PRI_READ_KEYS: 4064 ret = core_scsi3_pri_read_keys(cmd); 4065 break; 4066 case PRI_READ_RESERVATION: 4067 ret = core_scsi3_pri_read_reservation(cmd); 4068 break; 4069 case PRI_REPORT_CAPABILITIES: 4070 ret = core_scsi3_pri_report_capabilities(cmd); 4071 break; 4072 case PRI_READ_FULL_STATUS: 4073 ret = core_scsi3_pri_read_full_status(cmd); 4074 break; 4075 default: 4076 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4077 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4078 return TCM_INVALID_CDB_FIELD; 4079 } 4080 4081 if (!ret) 4082 target_complete_cmd(cmd, GOOD); 4083 return ret; 4084 } 4085 4086 sense_reason_t 4087 target_check_reservation(struct se_cmd *cmd) 4088 { 4089 struct se_device *dev = cmd->se_dev; 4090 sense_reason_t ret; 4091 4092 if (!cmd->se_sess) 4093 return 0; 4094 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4095 return 0; 4096 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4097 return 0; 4098 4099 spin_lock(&dev->dev_reservation_lock); 4100 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4101 ret = target_scsi2_reservation_check(cmd); 4102 else 4103 ret = target_scsi3_pr_reservation_check(cmd); 4104 spin_unlock(&dev->dev_reservation_lock); 4105 4106 return ret; 4107 } 4108