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 configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1371 &tpg->tpg_group.cg_item); 1372 } 1373 1374 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1375 { 1376 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1377 &tpg->tpg_group.cg_item); 1378 1379 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1380 } 1381 1382 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1383 { 1384 struct se_portal_group *tpg = nacl->se_tpg; 1385 1386 if (nacl->dynamic_node_acl) 1387 return 0; 1388 1389 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1390 &nacl->acl_group.cg_item); 1391 } 1392 1393 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1394 { 1395 struct se_portal_group *tpg = nacl->se_tpg; 1396 1397 if (nacl->dynamic_node_acl) { 1398 atomic_dec_mb(&nacl->acl_pr_ref_count); 1399 return; 1400 } 1401 1402 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1403 &nacl->acl_group.cg_item); 1404 1405 atomic_dec_mb(&nacl->acl_pr_ref_count); 1406 } 1407 1408 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1409 { 1410 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1411 struct se_node_acl *nacl; 1412 struct se_portal_group *tpg; 1413 /* 1414 * For nacl->dynamic_node_acl=1 1415 */ 1416 if (!lun_acl) 1417 return 0; 1418 1419 nacl = lun_acl->se_lun_nacl; 1420 tpg = nacl->se_tpg; 1421 1422 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1423 &lun_acl->se_lun_group.cg_item); 1424 } 1425 1426 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1427 { 1428 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1429 struct se_node_acl *nacl; 1430 struct se_portal_group *tpg; 1431 /* 1432 * For nacl->dynamic_node_acl=1 1433 */ 1434 if (!lun_acl) { 1435 atomic_dec_mb(&se_deve->pr_ref_count); 1436 return; 1437 } 1438 nacl = lun_acl->se_lun_nacl; 1439 tpg = nacl->se_tpg; 1440 1441 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1442 &lun_acl->se_lun_group.cg_item); 1443 1444 atomic_dec_mb(&se_deve->pr_ref_count); 1445 } 1446 1447 static sense_reason_t 1448 core_scsi3_decode_spec_i_port( 1449 struct se_cmd *cmd, 1450 struct se_portal_group *tpg, 1451 unsigned char *l_isid, 1452 u64 sa_res_key, 1453 int all_tg_pt, 1454 int aptpl) 1455 { 1456 struct se_device *dev = cmd->se_dev; 1457 struct se_port *tmp_port; 1458 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1459 struct se_session *se_sess = cmd->se_sess; 1460 struct se_node_acl *dest_node_acl = NULL; 1461 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1462 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1463 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1464 LIST_HEAD(tid_dest_list); 1465 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1466 const struct target_core_fabric_ops *tmp_tf_ops; 1467 unsigned char *buf; 1468 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1469 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1470 sense_reason_t ret; 1471 u32 tpdl, tid_len = 0; 1472 int dest_local_nexus; 1473 u32 dest_rtpi = 0; 1474 1475 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1476 /* 1477 * Allocate a struct pr_transport_id_holder and setup the 1478 * local_node_acl and local_se_deve pointers and add to 1479 * struct list_head tid_dest_list for add registration 1480 * processing in the loop of tid_dest_list below. 1481 */ 1482 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1483 if (!tidh_new) { 1484 pr_err("Unable to allocate tidh_new\n"); 1485 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1486 } 1487 INIT_LIST_HEAD(&tidh_new->dest_list); 1488 tidh_new->dest_tpg = tpg; 1489 tidh_new->dest_node_acl = se_sess->se_node_acl; 1490 tidh_new->dest_se_deve = local_se_deve; 1491 1492 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1493 se_sess->se_node_acl, local_se_deve, l_isid, 1494 sa_res_key, all_tg_pt, aptpl); 1495 if (!local_pr_reg) { 1496 kfree(tidh_new); 1497 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1498 } 1499 tidh_new->dest_pr_reg = local_pr_reg; 1500 /* 1501 * The local I_T nexus does not hold any configfs dependances, 1502 * so we set tid_h->dest_local_nexus=1 to prevent the 1503 * configfs_undepend_item() calls in the tid_dest_list loops below. 1504 */ 1505 tidh_new->dest_local_nexus = 1; 1506 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1507 1508 if (cmd->data_length < 28) { 1509 pr_warn("SPC-PR: Received PR OUT parameter list" 1510 " length too small: %u\n", cmd->data_length); 1511 ret = TCM_INVALID_PARAMETER_LIST; 1512 goto out; 1513 } 1514 1515 buf = transport_kmap_data_sg(cmd); 1516 if (!buf) { 1517 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1518 goto out; 1519 } 1520 1521 /* 1522 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1523 * first extract TransportID Parameter Data Length, and make sure 1524 * the value matches up to the SCSI expected data transfer length. 1525 */ 1526 tpdl = (buf[24] & 0xff) << 24; 1527 tpdl |= (buf[25] & 0xff) << 16; 1528 tpdl |= (buf[26] & 0xff) << 8; 1529 tpdl |= buf[27] & 0xff; 1530 1531 if ((tpdl + 28) != cmd->data_length) { 1532 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1533 " does not equal CDB data_length: %u\n", tpdl, 1534 cmd->data_length); 1535 ret = TCM_INVALID_PARAMETER_LIST; 1536 goto out_unmap; 1537 } 1538 /* 1539 * Start processing the received transport IDs using the 1540 * receiving I_T Nexus portal's fabric dependent methods to 1541 * obtain the SCSI Initiator Port/Device Identifiers. 1542 */ 1543 ptr = &buf[28]; 1544 1545 while (tpdl > 0) { 1546 proto_ident = (ptr[0] & 0x0f); 1547 dest_tpg = NULL; 1548 1549 spin_lock(&dev->se_port_lock); 1550 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1551 tmp_tpg = tmp_port->sep_tpg; 1552 if (!tmp_tpg) 1553 continue; 1554 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1555 if (!tmp_tf_ops) 1556 continue; 1557 if (!tmp_tf_ops->get_fabric_proto_ident || 1558 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1559 continue; 1560 /* 1561 * Look for the matching proto_ident provided by 1562 * the received TransportID 1563 */ 1564 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1565 if (tmp_proto_ident != proto_ident) 1566 continue; 1567 dest_rtpi = tmp_port->sep_rtpi; 1568 1569 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1570 tmp_tpg, (const char *)ptr, &tid_len, 1571 &iport_ptr); 1572 if (!i_str) 1573 continue; 1574 1575 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1576 spin_unlock(&dev->se_port_lock); 1577 1578 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1579 pr_err(" core_scsi3_tpg_depend_item()" 1580 " for tmp_tpg\n"); 1581 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1582 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1583 goto out_unmap; 1584 } 1585 /* 1586 * Locate the destination initiator ACL to be registered 1587 * from the decoded fabric module specific TransportID 1588 * at *i_str. 1589 */ 1590 spin_lock_irq(&tmp_tpg->acl_node_lock); 1591 dest_node_acl = __core_tpg_get_initiator_node_acl( 1592 tmp_tpg, i_str); 1593 if (dest_node_acl) 1594 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1595 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1596 1597 if (!dest_node_acl) { 1598 core_scsi3_tpg_undepend_item(tmp_tpg); 1599 spin_lock(&dev->se_port_lock); 1600 continue; 1601 } 1602 1603 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1604 pr_err("configfs_depend_item() failed" 1605 " for dest_node_acl->acl_group\n"); 1606 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1607 core_scsi3_tpg_undepend_item(tmp_tpg); 1608 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1609 goto out_unmap; 1610 } 1611 1612 dest_tpg = tmp_tpg; 1613 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1614 " %s Port RTPI: %hu\n", 1615 dest_tpg->se_tpg_tfo->get_fabric_name(), 1616 dest_node_acl->initiatorname, dest_rtpi); 1617 1618 spin_lock(&dev->se_port_lock); 1619 break; 1620 } 1621 spin_unlock(&dev->se_port_lock); 1622 1623 if (!dest_tpg) { 1624 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1625 " dest_tpg\n"); 1626 ret = TCM_INVALID_PARAMETER_LIST; 1627 goto out_unmap; 1628 } 1629 1630 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1631 " tid_len: %d for %s + %s\n", 1632 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1633 tpdl, tid_len, i_str, iport_ptr); 1634 1635 if (tid_len > tpdl) { 1636 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1637 " %u for Transport ID: %s\n", tid_len, ptr); 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 * Locate the desintation struct se_dev_entry pointer for matching 1645 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1646 * Target Port. 1647 */ 1648 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1649 dest_rtpi); 1650 if (!dest_se_deve) { 1651 pr_err("Unable to locate %s dest_se_deve" 1652 " from destination RTPI: %hu\n", 1653 dest_tpg->se_tpg_tfo->get_fabric_name(), 1654 dest_rtpi); 1655 1656 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1657 core_scsi3_tpg_undepend_item(dest_tpg); 1658 ret = TCM_INVALID_PARAMETER_LIST; 1659 goto out_unmap; 1660 } 1661 1662 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1663 pr_err("core_scsi3_lunacl_depend_item()" 1664 " failed\n"); 1665 atomic_dec_mb(&dest_se_deve->pr_ref_count); 1666 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1667 core_scsi3_tpg_undepend_item(dest_tpg); 1668 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1669 goto out_unmap; 1670 } 1671 1672 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1673 " dest_se_deve mapped_lun: %u\n", 1674 dest_tpg->se_tpg_tfo->get_fabric_name(), 1675 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1676 1677 /* 1678 * Skip any TransportIDs that already have a registration for 1679 * this target port. 1680 */ 1681 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1682 iport_ptr); 1683 if (pr_reg_e) { 1684 core_scsi3_put_pr_reg(pr_reg_e); 1685 core_scsi3_lunacl_undepend_item(dest_se_deve); 1686 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1687 core_scsi3_tpg_undepend_item(dest_tpg); 1688 ptr += tid_len; 1689 tpdl -= tid_len; 1690 tid_len = 0; 1691 continue; 1692 } 1693 /* 1694 * Allocate a struct pr_transport_id_holder and setup 1695 * the dest_node_acl and dest_se_deve pointers for the 1696 * loop below. 1697 */ 1698 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1699 GFP_KERNEL); 1700 if (!tidh_new) { 1701 pr_err("Unable to allocate tidh_new\n"); 1702 core_scsi3_lunacl_undepend_item(dest_se_deve); 1703 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1704 core_scsi3_tpg_undepend_item(dest_tpg); 1705 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1706 goto out_unmap; 1707 } 1708 INIT_LIST_HEAD(&tidh_new->dest_list); 1709 tidh_new->dest_tpg = dest_tpg; 1710 tidh_new->dest_node_acl = dest_node_acl; 1711 tidh_new->dest_se_deve = dest_se_deve; 1712 1713 /* 1714 * Allocate, but do NOT add the registration for the 1715 * TransportID referenced SCSI Initiator port. This 1716 * done because of the following from spc4r17 in section 1717 * 6.14.3 wrt SPEC_I_PT: 1718 * 1719 * "If a registration fails for any initiator port (e.g., if th 1720 * logical unit does not have enough resources available to 1721 * hold the registration information), no registrations shall be 1722 * made, and the command shall be terminated with 1723 * CHECK CONDITION status." 1724 * 1725 * That means we call __core_scsi3_alloc_registration() here, 1726 * and then call __core_scsi3_add_registration() in the 1727 * 2nd loop which will never fail. 1728 */ 1729 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1730 dest_node_acl, dest_se_deve, iport_ptr, 1731 sa_res_key, all_tg_pt, aptpl); 1732 if (!dest_pr_reg) { 1733 core_scsi3_lunacl_undepend_item(dest_se_deve); 1734 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1735 core_scsi3_tpg_undepend_item(dest_tpg); 1736 kfree(tidh_new); 1737 ret = TCM_INVALID_PARAMETER_LIST; 1738 goto out_unmap; 1739 } 1740 tidh_new->dest_pr_reg = dest_pr_reg; 1741 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1742 1743 ptr += tid_len; 1744 tpdl -= tid_len; 1745 tid_len = 0; 1746 1747 } 1748 1749 transport_kunmap_data_sg(cmd); 1750 1751 /* 1752 * Go ahead and create a registrations from tid_dest_list for the 1753 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1754 * and dest_se_deve. 1755 * 1756 * The SA Reservation Key from the PROUT is set for the 1757 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1758 * means that the TransportID Initiator port will be 1759 * registered on all of the target ports in the SCSI target device 1760 * ALL_TG_PT=0 means the registration will only be for the 1761 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1762 * was received. 1763 */ 1764 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1765 dest_tpg = tidh->dest_tpg; 1766 dest_node_acl = tidh->dest_node_acl; 1767 dest_se_deve = tidh->dest_se_deve; 1768 dest_pr_reg = tidh->dest_pr_reg; 1769 dest_local_nexus = tidh->dest_local_nexus; 1770 1771 list_del(&tidh->dest_list); 1772 kfree(tidh); 1773 1774 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1775 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1776 1777 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1778 dest_pr_reg, 0, 0); 1779 1780 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1781 " registered Transport ID for Node: %s%s Mapped LUN:" 1782 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1783 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun); 1784 1785 if (dest_local_nexus) 1786 continue; 1787 1788 core_scsi3_lunacl_undepend_item(dest_se_deve); 1789 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1790 core_scsi3_tpg_undepend_item(dest_tpg); 1791 } 1792 1793 return 0; 1794 out_unmap: 1795 transport_kunmap_data_sg(cmd); 1796 out: 1797 /* 1798 * For the failure case, release everything from tid_dest_list 1799 * including *dest_pr_reg and the configfs dependances.. 1800 */ 1801 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1802 dest_tpg = tidh->dest_tpg; 1803 dest_node_acl = tidh->dest_node_acl; 1804 dest_se_deve = tidh->dest_se_deve; 1805 dest_pr_reg = tidh->dest_pr_reg; 1806 dest_local_nexus = tidh->dest_local_nexus; 1807 1808 list_del(&tidh->dest_list); 1809 kfree(tidh); 1810 /* 1811 * Release any extra ALL_TG_PT=1 registrations for 1812 * the SPEC_I_PT=1 case. 1813 */ 1814 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1815 &dest_pr_reg->pr_reg_atp_list, 1816 pr_reg_atp_mem_list) { 1817 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1818 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1819 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1820 } 1821 1822 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1823 1824 if (dest_local_nexus) 1825 continue; 1826 1827 core_scsi3_lunacl_undepend_item(dest_se_deve); 1828 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1829 core_scsi3_tpg_undepend_item(dest_tpg); 1830 } 1831 return ret; 1832 } 1833 1834 static int core_scsi3_update_aptpl_buf( 1835 struct se_device *dev, 1836 unsigned char *buf, 1837 u32 pr_aptpl_buf_len) 1838 { 1839 struct se_lun *lun; 1840 struct se_portal_group *tpg; 1841 struct t10_pr_registration *pr_reg; 1842 unsigned char tmp[512], isid_buf[32]; 1843 ssize_t len = 0; 1844 int reg_count = 0; 1845 int ret = 0; 1846 1847 spin_lock(&dev->dev_reservation_lock); 1848 spin_lock(&dev->t10_pr.registration_lock); 1849 /* 1850 * Walk the registration list.. 1851 */ 1852 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1853 pr_reg_list) { 1854 1855 tmp[0] = '\0'; 1856 isid_buf[0] = '\0'; 1857 tpg = pr_reg->pr_reg_nacl->se_tpg; 1858 lun = pr_reg->pr_reg_tg_pt_lun; 1859 /* 1860 * Write out any ISID value to APTPL metadata that was included 1861 * in the original registration. 1862 */ 1863 if (pr_reg->isid_present_at_reg) 1864 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1865 pr_reg->pr_reg_isid); 1866 /* 1867 * Include special metadata if the pr_reg matches the 1868 * reservation holder. 1869 */ 1870 if (dev->dev_pr_res_holder == pr_reg) { 1871 snprintf(tmp, 512, "PR_REG_START: %d" 1872 "\ninitiator_fabric=%s\n" 1873 "initiator_node=%s\n%s" 1874 "sa_res_key=%llu\n" 1875 "res_holder=1\nres_type=%02x\n" 1876 "res_scope=%02x\nres_all_tg_pt=%d\n" 1877 "mapped_lun=%u\n", reg_count, 1878 tpg->se_tpg_tfo->get_fabric_name(), 1879 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1880 pr_reg->pr_res_key, pr_reg->pr_res_type, 1881 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1882 pr_reg->pr_res_mapped_lun); 1883 } else { 1884 snprintf(tmp, 512, "PR_REG_START: %d\n" 1885 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1886 "sa_res_key=%llu\nres_holder=0\n" 1887 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1888 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1889 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1890 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1891 pr_reg->pr_res_mapped_lun); 1892 } 1893 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1895 pr_err("Unable to update renaming APTPL metadata," 1896 " reallocating larger buffer\n"); 1897 ret = -EMSGSIZE; 1898 goto out; 1899 } 1900 len += sprintf(buf+len, "%s", tmp); 1901 1902 /* 1903 * Include information about the associated SCSI target port. 1904 */ 1905 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1906 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1907 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1908 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1909 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1910 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1911 1912 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1913 pr_err("Unable to update renaming APTPL metadata," 1914 " reallocating larger buffer\n"); 1915 ret = -EMSGSIZE; 1916 goto out; 1917 } 1918 len += sprintf(buf+len, "%s", tmp); 1919 reg_count++; 1920 } 1921 1922 if (!reg_count) 1923 len += sprintf(buf+len, "No Registrations or Reservations"); 1924 1925 out: 1926 spin_unlock(&dev->t10_pr.registration_lock); 1927 spin_unlock(&dev->dev_reservation_lock); 1928 1929 return ret; 1930 } 1931 1932 static int __core_scsi3_write_aptpl_to_file( 1933 struct se_device *dev, 1934 unsigned char *buf) 1935 { 1936 struct t10_wwn *wwn = &dev->t10_wwn; 1937 struct file *file; 1938 int flags = O_RDWR | O_CREAT | O_TRUNC; 1939 char path[512]; 1940 u32 pr_aptpl_buf_len; 1941 int ret; 1942 1943 memset(path, 0, 512); 1944 1945 if (strlen(&wwn->unit_serial[0]) >= 512) { 1946 pr_err("WWN value for struct se_device does not fit" 1947 " into path buffer\n"); 1948 return -EMSGSIZE; 1949 } 1950 1951 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1952 file = filp_open(path, flags, 0600); 1953 if (IS_ERR(file)) { 1954 pr_err("filp_open(%s) for APTPL metadata" 1955 " failed\n", path); 1956 return PTR_ERR(file); 1957 } 1958 1959 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1960 1961 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1962 1963 if (ret < 0) 1964 pr_debug("Error writing APTPL metadata file: %s\n", path); 1965 fput(file); 1966 1967 return (ret < 0) ? -EIO : 0; 1968 } 1969 1970 /* 1971 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1972 * write out the updated metadata to struct file for this SCSI device. 1973 */ 1974 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1975 { 1976 unsigned char *buf; 1977 int rc, len = PR_APTPL_BUF_LEN; 1978 1979 if (!aptpl) { 1980 char *null_buf = "No Registrations or Reservations\n"; 1981 1982 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1983 dev->t10_pr.pr_aptpl_active = 0; 1984 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1985 1986 if (rc) 1987 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1988 1989 return 0; 1990 } 1991 retry: 1992 buf = vzalloc(len); 1993 if (!buf) 1994 return TCM_OUT_OF_RESOURCES; 1995 1996 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1997 if (rc < 0) { 1998 vfree(buf); 1999 len *= 2; 2000 goto retry; 2001 } 2002 2003 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2004 if (rc != 0) { 2005 pr_err("SPC-3 PR: Could not update APTPL\n"); 2006 vfree(buf); 2007 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2008 } 2009 dev->t10_pr.pr_aptpl_active = 1; 2010 vfree(buf); 2011 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2012 return 0; 2013 } 2014 2015 static sense_reason_t 2016 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2017 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2018 { 2019 struct se_session *se_sess = cmd->se_sess; 2020 struct se_device *dev = cmd->se_dev; 2021 struct se_dev_entry *se_deve; 2022 struct se_lun *se_lun = cmd->se_lun; 2023 struct se_portal_group *se_tpg; 2024 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2025 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2026 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2027 sense_reason_t ret = TCM_NO_SENSE; 2028 int pr_holder = 0, type; 2029 2030 if (!se_sess || !se_lun) { 2031 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2032 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2033 } 2034 se_tpg = se_sess->se_tpg; 2035 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2036 2037 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2038 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2039 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2040 PR_REG_ISID_LEN); 2041 isid_ptr = &isid_buf[0]; 2042 } 2043 /* 2044 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2045 */ 2046 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2047 if (!pr_reg) { 2048 if (res_key) { 2049 pr_warn("SPC-3 PR: Reservation Key non-zero" 2050 " for SA REGISTER, returning CONFLICT\n"); 2051 return TCM_RESERVATION_CONFLICT; 2052 } 2053 /* 2054 * Do nothing but return GOOD status. 2055 */ 2056 if (!sa_res_key) 2057 return 0; 2058 2059 if (!spec_i_pt) { 2060 /* 2061 * Perform the Service Action REGISTER on the Initiator 2062 * Port Endpoint that the PRO was received from on the 2063 * Logical Unit of the SCSI device server. 2064 */ 2065 if (core_scsi3_alloc_registration(cmd->se_dev, 2066 se_sess->se_node_acl, se_deve, isid_ptr, 2067 sa_res_key, all_tg_pt, aptpl, 2068 register_type, 0)) { 2069 pr_err("Unable to allocate" 2070 " struct t10_pr_registration\n"); 2071 return TCM_INVALID_PARAMETER_LIST; 2072 } 2073 } else { 2074 /* 2075 * Register both the Initiator port that received 2076 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2077 * TransportID from Parameter list and loop through 2078 * fabric dependent parameter list while calling 2079 * logic from of core_scsi3_alloc_registration() for 2080 * each TransportID provided SCSI Initiator Port/Device 2081 */ 2082 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2083 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2084 if (ret != 0) 2085 return ret; 2086 } 2087 2088 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2089 } 2090 2091 /* ok, existing registration */ 2092 2093 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2094 pr_err("SPC-3 PR REGISTER: Received" 2095 " res_key: 0x%016Lx does not match" 2096 " existing SA REGISTER res_key:" 2097 " 0x%016Lx\n", res_key, 2098 pr_reg->pr_res_key); 2099 ret = TCM_RESERVATION_CONFLICT; 2100 goto out; 2101 } 2102 2103 if (spec_i_pt) { 2104 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2105 " set on a registered nexus\n"); 2106 ret = TCM_INVALID_PARAMETER_LIST; 2107 goto out; 2108 } 2109 2110 /* 2111 * An existing ALL_TG_PT=1 registration being released 2112 * must also set ALL_TG_PT=1 in the incoming PROUT. 2113 */ 2114 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2115 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2116 " registration exists, but ALL_TG_PT=1 bit not" 2117 " present in received PROUT\n"); 2118 ret = TCM_INVALID_CDB_FIELD; 2119 goto out; 2120 } 2121 2122 /* 2123 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2124 */ 2125 if (sa_res_key) { 2126 /* 2127 * Increment PRgeneration counter for struct se_device" 2128 * upon a successful REGISTER, see spc4r17 section 6.3.2 2129 * READ_KEYS service action. 2130 */ 2131 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2132 pr_reg->pr_res_key = sa_res_key; 2133 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2134 " Key for %s to: 0x%016Lx PRgeneration:" 2135 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2136 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2137 pr_reg->pr_reg_nacl->initiatorname, 2138 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2139 2140 } else { 2141 /* 2142 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2143 */ 2144 type = pr_reg->pr_res_type; 2145 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2146 pr_reg); 2147 if (pr_holder < 0) { 2148 ret = TCM_RESERVATION_CONFLICT; 2149 goto out; 2150 } 2151 2152 spin_lock(&pr_tmpl->registration_lock); 2153 /* 2154 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2155 * and matching pr_res_key. 2156 */ 2157 if (pr_reg->pr_reg_all_tg_pt) { 2158 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2159 &pr_tmpl->registration_list, 2160 pr_reg_list) { 2161 2162 if (!pr_reg_p->pr_reg_all_tg_pt) 2163 continue; 2164 if (pr_reg_p->pr_res_key != res_key) 2165 continue; 2166 if (pr_reg == pr_reg_p) 2167 continue; 2168 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2169 pr_reg_p->pr_reg_nacl->initiatorname)) 2170 continue; 2171 2172 __core_scsi3_free_registration(dev, 2173 pr_reg_p, NULL, 0); 2174 } 2175 } 2176 2177 /* 2178 * Release the calling I_T Nexus registration now.. 2179 */ 2180 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2181 pr_reg = NULL; 2182 2183 /* 2184 * From spc4r17, section 5.7.11.3 Unregistering 2185 * 2186 * If the persistent reservation is a registrants only 2187 * type, the device server shall establish a unit 2188 * attention condition for the initiator port associated 2189 * with every registered I_T nexus except for the I_T 2190 * nexus on which the PERSISTENT RESERVE OUT command was 2191 * received, with the additional sense code set to 2192 * RESERVATIONS RELEASED. 2193 */ 2194 if (pr_holder && 2195 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2196 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2197 list_for_each_entry(pr_reg_p, 2198 &pr_tmpl->registration_list, 2199 pr_reg_list) { 2200 2201 core_scsi3_ua_allocate( 2202 pr_reg_p->pr_reg_nacl, 2203 pr_reg_p->pr_res_mapped_lun, 2204 0x2A, 2205 ASCQ_2AH_RESERVATIONS_RELEASED); 2206 } 2207 } 2208 2209 spin_unlock(&pr_tmpl->registration_lock); 2210 } 2211 2212 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2213 2214 out: 2215 if (pr_reg) 2216 core_scsi3_put_pr_reg(pr_reg); 2217 return ret; 2218 } 2219 2220 unsigned char *core_scsi3_pr_dump_type(int type) 2221 { 2222 switch (type) { 2223 case PR_TYPE_WRITE_EXCLUSIVE: 2224 return "Write Exclusive Access"; 2225 case PR_TYPE_EXCLUSIVE_ACCESS: 2226 return "Exclusive Access"; 2227 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2228 return "Write Exclusive Access, Registrants Only"; 2229 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2230 return "Exclusive Access, Registrants Only"; 2231 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2232 return "Write Exclusive Access, All Registrants"; 2233 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2234 return "Exclusive Access, All Registrants"; 2235 default: 2236 break; 2237 } 2238 2239 return "Unknown SPC-3 PR Type"; 2240 } 2241 2242 static sense_reason_t 2243 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2244 { 2245 struct se_device *dev = cmd->se_dev; 2246 struct se_session *se_sess = cmd->se_sess; 2247 struct se_lun *se_lun = cmd->se_lun; 2248 struct t10_pr_registration *pr_reg, *pr_res_holder; 2249 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2250 char i_buf[PR_REG_ISID_ID_LEN]; 2251 sense_reason_t ret; 2252 2253 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2254 2255 if (!se_sess || !se_lun) { 2256 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2257 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2258 } 2259 /* 2260 * Locate the existing *pr_reg via struct se_node_acl pointers 2261 */ 2262 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2263 se_sess); 2264 if (!pr_reg) { 2265 pr_err("SPC-3 PR: Unable to locate" 2266 " PR_REGISTERED *pr_reg for RESERVE\n"); 2267 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2268 } 2269 /* 2270 * From spc4r17 Section 5.7.9: Reserving: 2271 * 2272 * An application client creates a persistent reservation by issuing 2273 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2274 * a registered I_T nexus with the following parameters: 2275 * a) RESERVATION KEY set to the value of the reservation key that is 2276 * registered with the logical unit for the I_T nexus; and 2277 */ 2278 if (res_key != pr_reg->pr_res_key) { 2279 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2280 " does not match existing SA REGISTER res_key:" 2281 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2282 ret = TCM_RESERVATION_CONFLICT; 2283 goto out_put_pr_reg; 2284 } 2285 /* 2286 * From spc4r17 Section 5.7.9: Reserving: 2287 * 2288 * From above: 2289 * b) TYPE field and SCOPE field set to the persistent reservation 2290 * being created. 2291 * 2292 * Only one persistent reservation is allowed at a time per logical unit 2293 * and that persistent reservation has a scope of LU_SCOPE. 2294 */ 2295 if (scope != PR_SCOPE_LU_SCOPE) { 2296 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2297 ret = TCM_INVALID_PARAMETER_LIST; 2298 goto out_put_pr_reg; 2299 } 2300 /* 2301 * See if we have an existing PR reservation holder pointer at 2302 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2303 * *pr_res_holder. 2304 */ 2305 spin_lock(&dev->dev_reservation_lock); 2306 pr_res_holder = dev->dev_pr_res_holder; 2307 if (pr_res_holder) { 2308 /* 2309 * From spc4r17 Section 5.7.9: Reserving: 2310 * 2311 * If the device server receives a PERSISTENT RESERVE OUT 2312 * command from an I_T nexus other than a persistent reservation 2313 * holder (see 5.7.10) that attempts to create a persistent 2314 * reservation when a persistent reservation already exists for 2315 * the logical unit, then the command shall be completed with 2316 * RESERVATION CONFLICT status. 2317 */ 2318 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2319 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2320 pr_err("SPC-3 PR: Attempted RESERVE from" 2321 " [%s]: %s while reservation already held by" 2322 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2323 cmd->se_tfo->get_fabric_name(), 2324 se_sess->se_node_acl->initiatorname, 2325 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2326 pr_res_holder->pr_reg_nacl->initiatorname); 2327 2328 spin_unlock(&dev->dev_reservation_lock); 2329 ret = TCM_RESERVATION_CONFLICT; 2330 goto out_put_pr_reg; 2331 } 2332 /* 2333 * From spc4r17 Section 5.7.9: Reserving: 2334 * 2335 * If a persistent reservation holder attempts to modify the 2336 * type or scope of an existing persistent reservation, the 2337 * command shall be completed with RESERVATION CONFLICT status. 2338 */ 2339 if ((pr_res_holder->pr_res_type != type) || 2340 (pr_res_holder->pr_res_scope != scope)) { 2341 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2342 pr_err("SPC-3 PR: Attempted RESERVE from" 2343 " [%s]: %s trying to change TYPE and/or SCOPE," 2344 " while reservation already held by [%s]: %s," 2345 " returning RESERVATION_CONFLICT\n", 2346 cmd->se_tfo->get_fabric_name(), 2347 se_sess->se_node_acl->initiatorname, 2348 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2349 pr_res_holder->pr_reg_nacl->initiatorname); 2350 2351 spin_unlock(&dev->dev_reservation_lock); 2352 ret = TCM_RESERVATION_CONFLICT; 2353 goto out_put_pr_reg; 2354 } 2355 /* 2356 * From spc4r17 Section 5.7.9: Reserving: 2357 * 2358 * If the device server receives a PERSISTENT RESERVE OUT 2359 * command with RESERVE service action where the TYPE field and 2360 * the SCOPE field contain the same values as the existing type 2361 * and scope from a persistent reservation holder, it shall not 2362 * make any change to the existing persistent reservation and 2363 * shall completethe command with GOOD status. 2364 */ 2365 spin_unlock(&dev->dev_reservation_lock); 2366 ret = 0; 2367 goto out_put_pr_reg; 2368 } 2369 /* 2370 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2371 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2372 */ 2373 pr_reg->pr_res_scope = scope; 2374 pr_reg->pr_res_type = type; 2375 pr_reg->pr_res_holder = 1; 2376 dev->dev_pr_res_holder = pr_reg; 2377 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2378 2379 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2380 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2381 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2382 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2383 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2384 cmd->se_tfo->get_fabric_name(), 2385 se_sess->se_node_acl->initiatorname, 2386 i_buf); 2387 spin_unlock(&dev->dev_reservation_lock); 2388 2389 if (pr_tmpl->pr_aptpl_active) 2390 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2391 2392 ret = 0; 2393 out_put_pr_reg: 2394 core_scsi3_put_pr_reg(pr_reg); 2395 return ret; 2396 } 2397 2398 static sense_reason_t 2399 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2400 u64 res_key) 2401 { 2402 switch (type) { 2403 case PR_TYPE_WRITE_EXCLUSIVE: 2404 case PR_TYPE_EXCLUSIVE_ACCESS: 2405 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2406 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2407 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2408 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2409 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2410 default: 2411 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2412 " 0x%02x\n", type); 2413 return TCM_INVALID_CDB_FIELD; 2414 } 2415 } 2416 2417 /* 2418 * Called with struct se_device->dev_reservation_lock held. 2419 */ 2420 static void __core_scsi3_complete_pro_release( 2421 struct se_device *dev, 2422 struct se_node_acl *se_nacl, 2423 struct t10_pr_registration *pr_reg, 2424 int explicit, 2425 int unreg) 2426 { 2427 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2428 char i_buf[PR_REG_ISID_ID_LEN]; 2429 int pr_res_type = 0, pr_res_scope = 0; 2430 2431 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2432 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2433 /* 2434 * Go ahead and release the current PR reservation holder. 2435 * If an All Registrants reservation is currently active and 2436 * a unregister operation is requested, replace the current 2437 * dev_pr_res_holder with another active registration. 2438 */ 2439 if (dev->dev_pr_res_holder) { 2440 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2441 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2442 dev->dev_pr_res_holder->pr_res_type = 0; 2443 dev->dev_pr_res_holder->pr_res_scope = 0; 2444 dev->dev_pr_res_holder->pr_res_holder = 0; 2445 dev->dev_pr_res_holder = NULL; 2446 } 2447 if (!unreg) 2448 goto out; 2449 2450 spin_lock(&dev->t10_pr.registration_lock); 2451 list_del_init(&pr_reg->pr_reg_list); 2452 /* 2453 * If the I_T nexus is a reservation holder, the persistent reservation 2454 * is of an all registrants type, and the I_T nexus is the last remaining 2455 * registered I_T nexus, then the device server shall also release the 2456 * persistent reservation. 2457 */ 2458 if (!list_empty(&dev->t10_pr.registration_list) && 2459 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2460 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2461 dev->dev_pr_res_holder = 2462 list_entry(dev->t10_pr.registration_list.next, 2463 struct t10_pr_registration, pr_reg_list); 2464 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2465 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2466 dev->dev_pr_res_holder->pr_res_holder = 1; 2467 } 2468 spin_unlock(&dev->t10_pr.registration_lock); 2469 out: 2470 if (!dev->dev_pr_res_holder) { 2471 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2472 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2473 tfo->get_fabric_name(), (explicit) ? "explicit" : 2474 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2475 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2476 } 2477 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2478 tfo->get_fabric_name(), se_nacl->initiatorname, 2479 i_buf); 2480 /* 2481 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2482 */ 2483 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2484 } 2485 2486 static sense_reason_t 2487 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2488 u64 res_key) 2489 { 2490 struct se_device *dev = cmd->se_dev; 2491 struct se_session *se_sess = cmd->se_sess; 2492 struct se_lun *se_lun = cmd->se_lun; 2493 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2494 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2495 sense_reason_t ret = 0; 2496 2497 if (!se_sess || !se_lun) { 2498 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2499 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2500 } 2501 /* 2502 * Locate the existing *pr_reg via struct se_node_acl pointers 2503 */ 2504 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2505 if (!pr_reg) { 2506 pr_err("SPC-3 PR: Unable to locate" 2507 " PR_REGISTERED *pr_reg for RELEASE\n"); 2508 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2509 } 2510 /* 2511 * From spc4r17 Section 5.7.11.2 Releasing: 2512 * 2513 * If there is no persistent reservation or in response to a persistent 2514 * reservation release request from a registered I_T nexus that is not a 2515 * persistent reservation holder (see 5.7.10), the device server shall 2516 * do the following: 2517 * 2518 * a) Not release the persistent reservation, if any; 2519 * b) Not remove any registrations; and 2520 * c) Complete the command with GOOD status. 2521 */ 2522 spin_lock(&dev->dev_reservation_lock); 2523 pr_res_holder = dev->dev_pr_res_holder; 2524 if (!pr_res_holder) { 2525 /* 2526 * No persistent reservation, return GOOD status. 2527 */ 2528 spin_unlock(&dev->dev_reservation_lock); 2529 goto out_put_pr_reg; 2530 } 2531 2532 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2533 /* 2534 * Release request from a registered I_T nexus that is not a 2535 * persistent reservation holder. return GOOD status. 2536 */ 2537 spin_unlock(&dev->dev_reservation_lock); 2538 goto out_put_pr_reg; 2539 } 2540 2541 /* 2542 * From spc4r17 Section 5.7.11.2 Releasing: 2543 * 2544 * Only the persistent reservation holder (see 5.7.10) is allowed to 2545 * release a persistent reservation. 2546 * 2547 * An application client releases the persistent reservation by issuing 2548 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2549 * an I_T nexus that is a persistent reservation holder with the 2550 * following parameters: 2551 * 2552 * a) RESERVATION KEY field set to the value of the reservation key 2553 * that is registered with the logical unit for the I_T nexus; 2554 */ 2555 if (res_key != pr_reg->pr_res_key) { 2556 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2557 " does not match existing SA REGISTER res_key:" 2558 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2559 spin_unlock(&dev->dev_reservation_lock); 2560 ret = TCM_RESERVATION_CONFLICT; 2561 goto out_put_pr_reg; 2562 } 2563 /* 2564 * From spc4r17 Section 5.7.11.2 Releasing and above: 2565 * 2566 * b) TYPE field and SCOPE field set to match the persistent 2567 * reservation being released. 2568 */ 2569 if ((pr_res_holder->pr_res_type != type) || 2570 (pr_res_holder->pr_res_scope != scope)) { 2571 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2572 pr_err("SPC-3 PR RELEASE: Attempted to release" 2573 " reservation from [%s]: %s with different TYPE " 2574 "and/or SCOPE while reservation already held by" 2575 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2576 cmd->se_tfo->get_fabric_name(), 2577 se_sess->se_node_acl->initiatorname, 2578 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2579 pr_res_holder->pr_reg_nacl->initiatorname); 2580 2581 spin_unlock(&dev->dev_reservation_lock); 2582 ret = TCM_RESERVATION_CONFLICT; 2583 goto out_put_pr_reg; 2584 } 2585 /* 2586 * In response to a persistent reservation release request from the 2587 * persistent reservation holder the device server shall perform a 2588 * release by doing the following as an uninterrupted series of actions: 2589 * a) Release the persistent reservation; 2590 * b) Not remove any registration(s); 2591 * c) If the released persistent reservation is a registrants only type 2592 * or all registrants type persistent reservation, 2593 * the device server shall establish a unit attention condition for 2594 * the initiator port associated with every regis- 2595 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2596 * RESERVE OUT command with RELEASE service action was received, 2597 * with the additional sense code set to RESERVATIONS RELEASED; and 2598 * d) If the persistent reservation is of any other type, the device 2599 * server shall not establish a unit attention condition. 2600 */ 2601 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2602 pr_reg, 1, 0); 2603 2604 spin_unlock(&dev->dev_reservation_lock); 2605 2606 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2607 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2608 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2609 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2610 /* 2611 * If no UNIT ATTENTION conditions will be established for 2612 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2613 * go ahead and check for APTPL=1 update+write below 2614 */ 2615 goto write_aptpl; 2616 } 2617 2618 spin_lock(&pr_tmpl->registration_lock); 2619 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2620 pr_reg_list) { 2621 /* 2622 * Do not establish a UNIT ATTENTION condition 2623 * for the calling I_T Nexus 2624 */ 2625 if (pr_reg_p == pr_reg) 2626 continue; 2627 2628 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2629 pr_reg_p->pr_res_mapped_lun, 2630 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2631 } 2632 spin_unlock(&pr_tmpl->registration_lock); 2633 2634 write_aptpl: 2635 if (pr_tmpl->pr_aptpl_active) 2636 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2637 2638 out_put_pr_reg: 2639 core_scsi3_put_pr_reg(pr_reg); 2640 return ret; 2641 } 2642 2643 static sense_reason_t 2644 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2645 { 2646 struct se_device *dev = cmd->se_dev; 2647 struct se_node_acl *pr_reg_nacl; 2648 struct se_session *se_sess = cmd->se_sess; 2649 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2650 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2651 u32 pr_res_mapped_lun = 0; 2652 int calling_it_nexus = 0; 2653 /* 2654 * Locate the existing *pr_reg via struct se_node_acl pointers 2655 */ 2656 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2657 se_sess->se_node_acl, se_sess); 2658 if (!pr_reg_n) { 2659 pr_err("SPC-3 PR: Unable to locate" 2660 " PR_REGISTERED *pr_reg for CLEAR\n"); 2661 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2662 } 2663 /* 2664 * From spc4r17 section 5.7.11.6, Clearing: 2665 * 2666 * Any application client may release the persistent reservation and 2667 * remove all registrations from a device server by issuing a 2668 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2669 * registered I_T nexus with the following parameter: 2670 * 2671 * a) RESERVATION KEY field set to the value of the reservation key 2672 * that is registered with the logical unit for the I_T nexus. 2673 */ 2674 if (res_key != pr_reg_n->pr_res_key) { 2675 pr_err("SPC-3 PR REGISTER: Received" 2676 " res_key: 0x%016Lx does not match" 2677 " existing SA REGISTER res_key:" 2678 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2679 core_scsi3_put_pr_reg(pr_reg_n); 2680 return TCM_RESERVATION_CONFLICT; 2681 } 2682 /* 2683 * a) Release the persistent reservation, if any; 2684 */ 2685 spin_lock(&dev->dev_reservation_lock); 2686 pr_res_holder = dev->dev_pr_res_holder; 2687 if (pr_res_holder) { 2688 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2689 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2690 pr_res_holder, 0, 0); 2691 } 2692 spin_unlock(&dev->dev_reservation_lock); 2693 /* 2694 * b) Remove all registration(s) (see spc4r17 5.7.7); 2695 */ 2696 spin_lock(&pr_tmpl->registration_lock); 2697 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2698 &pr_tmpl->registration_list, pr_reg_list) { 2699 2700 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2701 pr_reg_nacl = pr_reg->pr_reg_nacl; 2702 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2703 __core_scsi3_free_registration(dev, pr_reg, NULL, 2704 calling_it_nexus); 2705 /* 2706 * e) Establish a unit attention condition for the initiator 2707 * port associated with every registered I_T nexus other 2708 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2709 * command with CLEAR service action was received, with the 2710 * additional sense code set to RESERVATIONS PREEMPTED. 2711 */ 2712 if (!calling_it_nexus) 2713 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2714 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2715 } 2716 spin_unlock(&pr_tmpl->registration_lock); 2717 2718 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2719 cmd->se_tfo->get_fabric_name()); 2720 2721 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2722 2723 core_scsi3_pr_generation(dev); 2724 return 0; 2725 } 2726 2727 /* 2728 * Called with struct se_device->dev_reservation_lock held. 2729 */ 2730 static void __core_scsi3_complete_pro_preempt( 2731 struct se_device *dev, 2732 struct t10_pr_registration *pr_reg, 2733 struct list_head *preempt_and_abort_list, 2734 int type, 2735 int scope, 2736 enum preempt_type preempt_type) 2737 { 2738 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2739 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2740 char i_buf[PR_REG_ISID_ID_LEN]; 2741 2742 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2743 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2744 /* 2745 * Do an implicit RELEASE of the existing reservation. 2746 */ 2747 if (dev->dev_pr_res_holder) 2748 __core_scsi3_complete_pro_release(dev, nacl, 2749 dev->dev_pr_res_holder, 0, 0); 2750 2751 dev->dev_pr_res_holder = pr_reg; 2752 pr_reg->pr_res_holder = 1; 2753 pr_reg->pr_res_type = type; 2754 pr_reg->pr_res_scope = scope; 2755 2756 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2757 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2758 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2759 core_scsi3_pr_dump_type(type), 2760 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2761 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2762 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2763 nacl->initiatorname, i_buf); 2764 /* 2765 * For PREEMPT_AND_ABORT, add the preempting reservation's 2766 * struct t10_pr_registration to the list that will be compared 2767 * against received CDBs.. 2768 */ 2769 if (preempt_and_abort_list) 2770 list_add_tail(&pr_reg->pr_reg_abort_list, 2771 preempt_and_abort_list); 2772 } 2773 2774 static void core_scsi3_release_preempt_and_abort( 2775 struct list_head *preempt_and_abort_list, 2776 struct t10_pr_registration *pr_reg_holder) 2777 { 2778 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2779 2780 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2781 pr_reg_abort_list) { 2782 2783 list_del(&pr_reg->pr_reg_abort_list); 2784 if (pr_reg_holder == pr_reg) 2785 continue; 2786 if (pr_reg->pr_res_holder) { 2787 pr_warn("pr_reg->pr_res_holder still set\n"); 2788 continue; 2789 } 2790 2791 pr_reg->pr_reg_deve = NULL; 2792 pr_reg->pr_reg_nacl = NULL; 2793 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2794 } 2795 } 2796 2797 static sense_reason_t 2798 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2799 u64 sa_res_key, enum preempt_type preempt_type) 2800 { 2801 struct se_device *dev = cmd->se_dev; 2802 struct se_node_acl *pr_reg_nacl; 2803 struct se_session *se_sess = cmd->se_sess; 2804 LIST_HEAD(preempt_and_abort_list); 2805 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2806 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2807 u32 pr_res_mapped_lun = 0; 2808 int all_reg = 0, calling_it_nexus = 0; 2809 bool sa_res_key_unmatched = sa_res_key != 0; 2810 int prh_type = 0, prh_scope = 0; 2811 2812 if (!se_sess) 2813 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2814 2815 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2816 se_sess); 2817 if (!pr_reg_n) { 2818 pr_err("SPC-3 PR: Unable to locate" 2819 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2820 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2821 return TCM_RESERVATION_CONFLICT; 2822 } 2823 if (pr_reg_n->pr_res_key != res_key) { 2824 core_scsi3_put_pr_reg(pr_reg_n); 2825 return TCM_RESERVATION_CONFLICT; 2826 } 2827 if (scope != PR_SCOPE_LU_SCOPE) { 2828 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2829 core_scsi3_put_pr_reg(pr_reg_n); 2830 return TCM_INVALID_PARAMETER_LIST; 2831 } 2832 2833 spin_lock(&dev->dev_reservation_lock); 2834 pr_res_holder = dev->dev_pr_res_holder; 2835 if (pr_res_holder && 2836 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2837 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2838 all_reg = 1; 2839 2840 if (!all_reg && !sa_res_key) { 2841 spin_unlock(&dev->dev_reservation_lock); 2842 core_scsi3_put_pr_reg(pr_reg_n); 2843 return TCM_INVALID_PARAMETER_LIST; 2844 } 2845 /* 2846 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2847 * 2848 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2849 * persistent reservation holder or there is no persistent reservation 2850 * holder (i.e., there is no persistent reservation), then the device 2851 * server shall perform a preempt by doing the following in an 2852 * uninterrupted series of actions. (See below..) 2853 */ 2854 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2855 /* 2856 * No existing or SA Reservation Key matching reservations.. 2857 * 2858 * PROUT SA PREEMPT with All Registrant type reservations are 2859 * allowed to be processed without a matching SA Reservation Key 2860 */ 2861 spin_lock(&pr_tmpl->registration_lock); 2862 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2863 &pr_tmpl->registration_list, pr_reg_list) { 2864 /* 2865 * Removing of registrations in non all registrants 2866 * type reservations without a matching SA reservation 2867 * key. 2868 * 2869 * a) Remove the registrations for all I_T nexuses 2870 * specified by the SERVICE ACTION RESERVATION KEY 2871 * field; 2872 * b) Ignore the contents of the SCOPE and TYPE fields; 2873 * c) Process tasks as defined in 5.7.1; and 2874 * d) Establish a unit attention condition for the 2875 * initiator port associated with every I_T nexus 2876 * that lost its registration other than the I_T 2877 * nexus on which the PERSISTENT RESERVE OUT command 2878 * was received, with the additional sense code set 2879 * to REGISTRATIONS PREEMPTED. 2880 */ 2881 if (!all_reg) { 2882 if (pr_reg->pr_res_key != sa_res_key) 2883 continue; 2884 sa_res_key_unmatched = false; 2885 2886 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2887 pr_reg_nacl = pr_reg->pr_reg_nacl; 2888 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2889 __core_scsi3_free_registration(dev, pr_reg, 2890 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2891 NULL, calling_it_nexus); 2892 } else { 2893 /* 2894 * Case for any existing all registrants type 2895 * reservation, follow logic in spc4r17 section 2896 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2897 * 2898 * For a ZERO SA Reservation key, release 2899 * all other registrations and do an implicit 2900 * release of active persistent reservation. 2901 * 2902 * For a non-ZERO SA Reservation key, only 2903 * release the matching reservation key from 2904 * registrations. 2905 */ 2906 if ((sa_res_key) && 2907 (pr_reg->pr_res_key != sa_res_key)) 2908 continue; 2909 sa_res_key_unmatched = false; 2910 2911 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2912 if (calling_it_nexus) 2913 continue; 2914 2915 pr_reg_nacl = pr_reg->pr_reg_nacl; 2916 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2917 __core_scsi3_free_registration(dev, pr_reg, 2918 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2919 NULL, 0); 2920 } 2921 if (!calling_it_nexus) 2922 core_scsi3_ua_allocate(pr_reg_nacl, 2923 pr_res_mapped_lun, 0x2A, 2924 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2925 } 2926 spin_unlock(&pr_tmpl->registration_lock); 2927 /* 2928 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2929 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2930 * RESERVATION KEY field to a value that does not match any 2931 * registered reservation key, then the device server shall 2932 * complete the command with RESERVATION CONFLICT status. 2933 */ 2934 if (sa_res_key_unmatched) { 2935 spin_unlock(&dev->dev_reservation_lock); 2936 core_scsi3_put_pr_reg(pr_reg_n); 2937 return TCM_RESERVATION_CONFLICT; 2938 } 2939 /* 2940 * For an existing all registrants type reservation 2941 * with a zero SA rservation key, preempt the existing 2942 * reservation with the new PR type and scope. 2943 */ 2944 if (pr_res_holder && all_reg && !(sa_res_key)) { 2945 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2946 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2947 type, scope, preempt_type); 2948 2949 if (preempt_type == PREEMPT_AND_ABORT) 2950 core_scsi3_release_preempt_and_abort( 2951 &preempt_and_abort_list, pr_reg_n); 2952 } 2953 spin_unlock(&dev->dev_reservation_lock); 2954 2955 if (pr_tmpl->pr_aptpl_active) 2956 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2957 2958 core_scsi3_put_pr_reg(pr_reg_n); 2959 core_scsi3_pr_generation(cmd->se_dev); 2960 return 0; 2961 } 2962 /* 2963 * The PREEMPTing SA reservation key matches that of the 2964 * existing persistent reservation, first, we check if 2965 * we are preempting our own reservation. 2966 * From spc4r17, section 5.7.11.4.3 Preempting 2967 * persistent reservations and registration handling 2968 * 2969 * If an all registrants persistent reservation is not 2970 * present, it is not an error for the persistent 2971 * reservation holder to preempt itself (i.e., a 2972 * PERSISTENT RESERVE OUT with a PREEMPT service action 2973 * or a PREEMPT AND ABORT service action with the 2974 * SERVICE ACTION RESERVATION KEY value equal to the 2975 * persistent reservation holder's reservation key that 2976 * is received from the persistent reservation holder). 2977 * In that case, the device server shall establish the 2978 * new persistent reservation and maintain the 2979 * registration. 2980 */ 2981 prh_type = pr_res_holder->pr_res_type; 2982 prh_scope = pr_res_holder->pr_res_scope; 2983 /* 2984 * If the SERVICE ACTION RESERVATION KEY field identifies a 2985 * persistent reservation holder (see 5.7.10), the device 2986 * server shall perform a preempt by doing the following as 2987 * an uninterrupted series of actions: 2988 * 2989 * a) Release the persistent reservation for the holder 2990 * identified by the SERVICE ACTION RESERVATION KEY field; 2991 */ 2992 if (pr_reg_n != pr_res_holder) 2993 __core_scsi3_complete_pro_release(dev, 2994 pr_res_holder->pr_reg_nacl, 2995 dev->dev_pr_res_holder, 0, 0); 2996 /* 2997 * b) Remove the registrations for all I_T nexuses identified 2998 * by the SERVICE ACTION RESERVATION KEY field, except the 2999 * I_T nexus that is being used for the PERSISTENT RESERVE 3000 * OUT command. If an all registrants persistent reservation 3001 * is present and the SERVICE ACTION RESERVATION KEY field 3002 * is set to zero, then all registrations shall be removed 3003 * except for that of the I_T nexus that is being used for 3004 * the PERSISTENT RESERVE OUT command; 3005 */ 3006 spin_lock(&pr_tmpl->registration_lock); 3007 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3008 &pr_tmpl->registration_list, pr_reg_list) { 3009 3010 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3011 if (calling_it_nexus) 3012 continue; 3013 3014 if (pr_reg->pr_res_key != sa_res_key) 3015 continue; 3016 3017 pr_reg_nacl = pr_reg->pr_reg_nacl; 3018 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3019 __core_scsi3_free_registration(dev, pr_reg, 3020 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3021 calling_it_nexus); 3022 /* 3023 * e) Establish a unit attention condition for the initiator 3024 * port associated with every I_T nexus that lost its 3025 * persistent reservation and/or registration, with the 3026 * additional sense code set to REGISTRATIONS PREEMPTED; 3027 */ 3028 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3029 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3030 } 3031 spin_unlock(&pr_tmpl->registration_lock); 3032 /* 3033 * c) Establish a persistent reservation for the preempting 3034 * I_T nexus using the contents of the SCOPE and TYPE fields; 3035 */ 3036 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3037 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3038 type, scope, preempt_type); 3039 /* 3040 * d) Process tasks as defined in 5.7.1; 3041 * e) See above.. 3042 * f) If the type or scope has changed, then for every I_T nexus 3043 * whose reservation key was not removed, except for the I_T 3044 * nexus on which the PERSISTENT RESERVE OUT command was 3045 * received, the device server shall establish a unit 3046 * attention condition for the initiator port associated with 3047 * that I_T nexus, with the additional sense code set to 3048 * RESERVATIONS RELEASED. If the type or scope have not 3049 * changed, then no unit attention condition(s) shall be 3050 * established for this reason. 3051 */ 3052 if ((prh_type != type) || (prh_scope != scope)) { 3053 spin_lock(&pr_tmpl->registration_lock); 3054 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3055 &pr_tmpl->registration_list, pr_reg_list) { 3056 3057 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3058 if (calling_it_nexus) 3059 continue; 3060 3061 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3062 pr_reg->pr_res_mapped_lun, 0x2A, 3063 ASCQ_2AH_RESERVATIONS_RELEASED); 3064 } 3065 spin_unlock(&pr_tmpl->registration_lock); 3066 } 3067 spin_unlock(&dev->dev_reservation_lock); 3068 /* 3069 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3070 * All received CDBs for the matching existing reservation and 3071 * registrations undergo ABORT_TASK logic. 3072 * 3073 * From there, core_scsi3_release_preempt_and_abort() will 3074 * release every registration in the list (which have already 3075 * been removed from the primary pr_reg list), except the 3076 * new persistent reservation holder, the calling Initiator Port. 3077 */ 3078 if (preempt_type == PREEMPT_AND_ABORT) { 3079 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3080 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3081 pr_reg_n); 3082 } 3083 3084 if (pr_tmpl->pr_aptpl_active) 3085 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3086 3087 core_scsi3_put_pr_reg(pr_reg_n); 3088 core_scsi3_pr_generation(cmd->se_dev); 3089 return 0; 3090 } 3091 3092 static sense_reason_t 3093 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3094 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3095 { 3096 switch (type) { 3097 case PR_TYPE_WRITE_EXCLUSIVE: 3098 case PR_TYPE_EXCLUSIVE_ACCESS: 3099 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3100 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3101 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3102 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3103 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3104 sa_res_key, preempt_type); 3105 default: 3106 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3107 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3108 return TCM_INVALID_CDB_FIELD; 3109 } 3110 } 3111 3112 3113 static sense_reason_t 3114 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3115 u64 sa_res_key, int aptpl, int unreg) 3116 { 3117 struct se_session *se_sess = cmd->se_sess; 3118 struct se_device *dev = cmd->se_dev; 3119 struct se_dev_entry *dest_se_deve = NULL; 3120 struct se_lun *se_lun = cmd->se_lun; 3121 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3122 struct se_port *se_port; 3123 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3124 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3125 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3126 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3127 unsigned char *buf; 3128 unsigned char *initiator_str; 3129 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3130 u32 tid_len, tmp_tid_len; 3131 int new_reg = 0, type, scope, matching_iname; 3132 sense_reason_t ret; 3133 unsigned short rtpi; 3134 unsigned char proto_ident; 3135 3136 if (!se_sess || !se_lun) { 3137 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3138 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3139 } 3140 3141 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3142 se_tpg = se_sess->se_tpg; 3143 tf_ops = se_tpg->se_tpg_tfo; 3144 /* 3145 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3146 * Register behaviors for a REGISTER AND MOVE service action 3147 * 3148 * Locate the existing *pr_reg via struct se_node_acl pointers 3149 */ 3150 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3151 se_sess); 3152 if (!pr_reg) { 3153 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3154 " *pr_reg for REGISTER_AND_MOVE\n"); 3155 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3156 } 3157 /* 3158 * The provided reservation key much match the existing reservation key 3159 * provided during this initiator's I_T nexus registration. 3160 */ 3161 if (res_key != pr_reg->pr_res_key) { 3162 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3163 " res_key: 0x%016Lx does not match existing SA REGISTER" 3164 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3165 ret = TCM_RESERVATION_CONFLICT; 3166 goto out_put_pr_reg; 3167 } 3168 /* 3169 * The service active reservation key needs to be non zero 3170 */ 3171 if (!sa_res_key) { 3172 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3173 " sa_res_key\n"); 3174 ret = TCM_INVALID_PARAMETER_LIST; 3175 goto out_put_pr_reg; 3176 } 3177 3178 /* 3179 * Determine the Relative Target Port Identifier where the reservation 3180 * will be moved to for the TransportID containing SCSI initiator WWN 3181 * information. 3182 */ 3183 buf = transport_kmap_data_sg(cmd); 3184 if (!buf) { 3185 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3186 goto out_put_pr_reg; 3187 } 3188 3189 rtpi = (buf[18] & 0xff) << 8; 3190 rtpi |= buf[19] & 0xff; 3191 tid_len = (buf[20] & 0xff) << 24; 3192 tid_len |= (buf[21] & 0xff) << 16; 3193 tid_len |= (buf[22] & 0xff) << 8; 3194 tid_len |= buf[23] & 0xff; 3195 transport_kunmap_data_sg(cmd); 3196 buf = NULL; 3197 3198 if ((tid_len + 24) != cmd->data_length) { 3199 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3200 " does not equal CDB data_length: %u\n", tid_len, 3201 cmd->data_length); 3202 ret = TCM_INVALID_PARAMETER_LIST; 3203 goto out_put_pr_reg; 3204 } 3205 3206 spin_lock(&dev->se_port_lock); 3207 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3208 if (se_port->sep_rtpi != rtpi) 3209 continue; 3210 dest_se_tpg = se_port->sep_tpg; 3211 if (!dest_se_tpg) 3212 continue; 3213 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3214 if (!dest_tf_ops) 3215 continue; 3216 3217 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3218 spin_unlock(&dev->se_port_lock); 3219 3220 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3221 pr_err("core_scsi3_tpg_depend_item() failed" 3222 " for dest_se_tpg\n"); 3223 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3224 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3225 goto out_put_pr_reg; 3226 } 3227 3228 spin_lock(&dev->se_port_lock); 3229 break; 3230 } 3231 spin_unlock(&dev->se_port_lock); 3232 3233 if (!dest_se_tpg || !dest_tf_ops) { 3234 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3235 " fabric ops from Relative Target Port Identifier:" 3236 " %hu\n", rtpi); 3237 ret = TCM_INVALID_PARAMETER_LIST; 3238 goto out_put_pr_reg; 3239 } 3240 3241 buf = transport_kmap_data_sg(cmd); 3242 if (!buf) { 3243 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3244 goto out_put_pr_reg; 3245 } 3246 proto_ident = (buf[24] & 0x0f); 3247 3248 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3249 " 0x%02x\n", proto_ident); 3250 3251 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3252 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3253 " proto_ident: 0x%02x does not match ident: 0x%02x" 3254 " from fabric: %s\n", proto_ident, 3255 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3256 dest_tf_ops->get_fabric_name()); 3257 ret = TCM_INVALID_PARAMETER_LIST; 3258 goto out; 3259 } 3260 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3261 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3262 " containg a valid tpg_parse_pr_out_transport_id" 3263 " function pointer\n"); 3264 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3265 goto out; 3266 } 3267 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3268 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3269 if (!initiator_str) { 3270 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3271 " initiator_str from Transport ID\n"); 3272 ret = TCM_INVALID_PARAMETER_LIST; 3273 goto out; 3274 } 3275 3276 transport_kunmap_data_sg(cmd); 3277 buf = NULL; 3278 3279 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3280 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3281 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3282 iport_ptr : ""); 3283 /* 3284 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3285 * action specifies a TransportID that is the same as the initiator port 3286 * of the I_T nexus for the command received, then the command shall 3287 * be terminated with CHECK CONDITION status, with the sense key set to 3288 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3289 * IN PARAMETER LIST. 3290 */ 3291 pr_reg_nacl = pr_reg->pr_reg_nacl; 3292 matching_iname = (!strcmp(initiator_str, 3293 pr_reg_nacl->initiatorname)) ? 1 : 0; 3294 if (!matching_iname) 3295 goto after_iport_check; 3296 3297 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3298 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3299 " matches: %s on received I_T Nexus\n", initiator_str, 3300 pr_reg_nacl->initiatorname); 3301 ret = TCM_INVALID_PARAMETER_LIST; 3302 goto out; 3303 } 3304 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3305 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3306 " matches: %s %s on received I_T Nexus\n", 3307 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3308 pr_reg->pr_reg_isid); 3309 ret = TCM_INVALID_PARAMETER_LIST; 3310 goto out; 3311 } 3312 after_iport_check: 3313 /* 3314 * Locate the destination struct se_node_acl from the received Transport ID 3315 */ 3316 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3317 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3318 initiator_str); 3319 if (dest_node_acl) 3320 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3321 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3322 3323 if (!dest_node_acl) { 3324 pr_err("Unable to locate %s dest_node_acl for" 3325 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3326 initiator_str); 3327 ret = TCM_INVALID_PARAMETER_LIST; 3328 goto out; 3329 } 3330 3331 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3332 pr_err("core_scsi3_nodeacl_depend_item() for" 3333 " dest_node_acl\n"); 3334 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3335 dest_node_acl = NULL; 3336 ret = TCM_INVALID_PARAMETER_LIST; 3337 goto out; 3338 } 3339 3340 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3341 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3342 dest_node_acl->initiatorname); 3343 3344 /* 3345 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3346 * PORT IDENTIFIER. 3347 */ 3348 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3349 if (!dest_se_deve) { 3350 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3351 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3352 ret = TCM_INVALID_PARAMETER_LIST; 3353 goto out; 3354 } 3355 3356 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3357 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3358 atomic_dec_mb(&dest_se_deve->pr_ref_count); 3359 dest_se_deve = NULL; 3360 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3361 goto out; 3362 } 3363 3364 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3365 " ACL for dest_se_deve->mapped_lun: %u\n", 3366 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3367 dest_se_deve->mapped_lun); 3368 3369 /* 3370 * A persistent reservation needs to already existing in order to 3371 * successfully complete the REGISTER_AND_MOVE service action.. 3372 */ 3373 spin_lock(&dev->dev_reservation_lock); 3374 pr_res_holder = dev->dev_pr_res_holder; 3375 if (!pr_res_holder) { 3376 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3377 " currently held\n"); 3378 spin_unlock(&dev->dev_reservation_lock); 3379 ret = TCM_INVALID_CDB_FIELD; 3380 goto out; 3381 } 3382 /* 3383 * The received on I_T Nexus must be the reservation holder. 3384 * 3385 * From spc4r17 section 5.7.8 Table 50 -- 3386 * Register behaviors for a REGISTER AND MOVE service action 3387 */ 3388 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3389 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3390 " Nexus is not reservation holder\n"); 3391 spin_unlock(&dev->dev_reservation_lock); 3392 ret = TCM_RESERVATION_CONFLICT; 3393 goto out; 3394 } 3395 /* 3396 * From spc4r17 section 5.7.8: registering and moving reservation 3397 * 3398 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3399 * action is received and the established persistent reservation is a 3400 * Write Exclusive - All Registrants type or Exclusive Access - 3401 * All Registrants type reservation, then the command shall be completed 3402 * with RESERVATION CONFLICT status. 3403 */ 3404 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3405 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3406 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3407 " reservation for type: %s\n", 3408 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3409 spin_unlock(&dev->dev_reservation_lock); 3410 ret = TCM_RESERVATION_CONFLICT; 3411 goto out; 3412 } 3413 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3414 /* 3415 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3416 */ 3417 type = pr_res_holder->pr_res_type; 3418 scope = pr_res_holder->pr_res_type; 3419 /* 3420 * c) Associate the reservation key specified in the SERVICE ACTION 3421 * RESERVATION KEY field with the I_T nexus specified as the 3422 * destination of the register and move, where: 3423 * A) The I_T nexus is specified by the TransportID and the 3424 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3425 * B) Regardless of the TransportID format used, the association for 3426 * the initiator port is based on either the initiator port name 3427 * (see 3.1.71) on SCSI transport protocols where port names are 3428 * required or the initiator port identifier (see 3.1.70) on SCSI 3429 * transport protocols where port names are not required; 3430 * d) Register the reservation key specified in the SERVICE ACTION 3431 * RESERVATION KEY field; 3432 * e) Retain the reservation key specified in the SERVICE ACTION 3433 * RESERVATION KEY field and associated information; 3434 * 3435 * Also, It is not an error for a REGISTER AND MOVE service action to 3436 * register an I_T nexus that is already registered with the same 3437 * reservation key or a different reservation key. 3438 */ 3439 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3440 iport_ptr); 3441 if (!dest_pr_reg) { 3442 if (core_scsi3_alloc_registration(cmd->se_dev, 3443 dest_node_acl, dest_se_deve, iport_ptr, 3444 sa_res_key, 0, aptpl, 2, 1)) { 3445 spin_unlock(&dev->dev_reservation_lock); 3446 ret = TCM_INVALID_PARAMETER_LIST; 3447 goto out; 3448 } 3449 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3450 iport_ptr); 3451 new_reg = 1; 3452 } 3453 /* 3454 * f) Release the persistent reservation for the persistent reservation 3455 * holder (i.e., the I_T nexus on which the 3456 */ 3457 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3458 dev->dev_pr_res_holder, 0, 0); 3459 /* 3460 * g) Move the persistent reservation to the specified I_T nexus using 3461 * the same scope and type as the persistent reservation released in 3462 * item f); and 3463 */ 3464 dev->dev_pr_res_holder = dest_pr_reg; 3465 dest_pr_reg->pr_res_holder = 1; 3466 dest_pr_reg->pr_res_type = type; 3467 pr_reg->pr_res_scope = scope; 3468 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3469 /* 3470 * Increment PRGeneration for existing registrations.. 3471 */ 3472 if (!new_reg) 3473 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3474 spin_unlock(&dev->dev_reservation_lock); 3475 3476 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3477 " created new reservation holder TYPE: %s on object RTPI:" 3478 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3479 core_scsi3_pr_dump_type(type), rtpi, 3480 dest_pr_reg->pr_res_generation); 3481 pr_debug("SPC-3 PR Successfully moved reservation from" 3482 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3483 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3484 i_buf, dest_tf_ops->get_fabric_name(), 3485 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3486 iport_ptr : ""); 3487 /* 3488 * It is now safe to release configfs group dependencies for destination 3489 * of Transport ID Initiator Device/Port Identifier 3490 */ 3491 core_scsi3_lunacl_undepend_item(dest_se_deve); 3492 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3493 core_scsi3_tpg_undepend_item(dest_se_tpg); 3494 /* 3495 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3496 * nexus on which PERSISTENT RESERVE OUT command was received. 3497 */ 3498 if (unreg) { 3499 spin_lock(&pr_tmpl->registration_lock); 3500 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3501 spin_unlock(&pr_tmpl->registration_lock); 3502 } else 3503 core_scsi3_put_pr_reg(pr_reg); 3504 3505 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3506 3507 transport_kunmap_data_sg(cmd); 3508 3509 core_scsi3_put_pr_reg(dest_pr_reg); 3510 return 0; 3511 out: 3512 if (buf) 3513 transport_kunmap_data_sg(cmd); 3514 if (dest_se_deve) 3515 core_scsi3_lunacl_undepend_item(dest_se_deve); 3516 if (dest_node_acl) 3517 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3518 core_scsi3_tpg_undepend_item(dest_se_tpg); 3519 3520 out_put_pr_reg: 3521 core_scsi3_put_pr_reg(pr_reg); 3522 return ret; 3523 } 3524 3525 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3526 { 3527 unsigned int __v1, __v2; 3528 3529 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3530 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3531 3532 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3533 } 3534 3535 /* 3536 * See spc4r17 section 6.14 Table 170 3537 */ 3538 sense_reason_t 3539 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3540 { 3541 struct se_device *dev = cmd->se_dev; 3542 unsigned char *cdb = &cmd->t_task_cdb[0]; 3543 unsigned char *buf; 3544 u64 res_key, sa_res_key; 3545 int sa, scope, type, aptpl; 3546 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3547 sense_reason_t ret; 3548 3549 /* 3550 * Following spc2r20 5.5.1 Reservations overview: 3551 * 3552 * If a logical unit has been reserved by any RESERVE command and is 3553 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3554 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3555 * initiator or service action and shall terminate with a RESERVATION 3556 * CONFLICT status. 3557 */ 3558 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3559 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3560 " SPC-2 reservation is held, returning" 3561 " RESERVATION_CONFLICT\n"); 3562 return TCM_RESERVATION_CONFLICT; 3563 } 3564 3565 /* 3566 * FIXME: A NULL struct se_session pointer means an this is not coming from 3567 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3568 */ 3569 if (!cmd->se_sess) 3570 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3571 3572 if (cmd->data_length < 24) { 3573 pr_warn("SPC-PR: Received PR OUT parameter list" 3574 " length too small: %u\n", cmd->data_length); 3575 return TCM_INVALID_PARAMETER_LIST; 3576 } 3577 3578 /* 3579 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3580 */ 3581 sa = (cdb[1] & 0x1f); 3582 scope = (cdb[2] & 0xf0); 3583 type = (cdb[2] & 0x0f); 3584 3585 buf = transport_kmap_data_sg(cmd); 3586 if (!buf) 3587 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3588 3589 /* 3590 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3591 */ 3592 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3593 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3594 /* 3595 * REGISTER_AND_MOVE uses a different SA parameter list containing 3596 * SCSI TransportIDs. 3597 */ 3598 if (sa != PRO_REGISTER_AND_MOVE) { 3599 spec_i_pt = (buf[20] & 0x08); 3600 all_tg_pt = (buf[20] & 0x04); 3601 aptpl = (buf[20] & 0x01); 3602 } else { 3603 aptpl = (buf[17] & 0x01); 3604 unreg = (buf[17] & 0x02); 3605 } 3606 /* 3607 * If the backend device has been configured to force APTPL metadata 3608 * write-out, go ahead and propigate aptpl=1 down now. 3609 */ 3610 if (dev->dev_attrib.force_pr_aptpl) 3611 aptpl = 1; 3612 3613 transport_kunmap_data_sg(cmd); 3614 buf = NULL; 3615 3616 /* 3617 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3618 */ 3619 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3620 return TCM_INVALID_PARAMETER_LIST; 3621 3622 /* 3623 * From spc4r17 section 6.14: 3624 * 3625 * If the SPEC_I_PT bit is set to zero, the service action is not 3626 * REGISTER AND MOVE, and the parameter list length is not 24, then 3627 * the command shall be terminated with CHECK CONDITION status, with 3628 * the sense key set to ILLEGAL REQUEST, and the additional sense 3629 * code set to PARAMETER LIST LENGTH ERROR. 3630 */ 3631 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3632 (cmd->data_length != 24)) { 3633 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3634 " list length: %u\n", cmd->data_length); 3635 return TCM_INVALID_PARAMETER_LIST; 3636 } 3637 3638 /* 3639 * (core_scsi3_emulate_pro_* function parameters 3640 * are defined by spc4r17 Table 174: 3641 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3642 */ 3643 switch (sa) { 3644 case PRO_REGISTER: 3645 ret = core_scsi3_emulate_pro_register(cmd, 3646 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3647 break; 3648 case PRO_RESERVE: 3649 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3650 break; 3651 case PRO_RELEASE: 3652 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3653 break; 3654 case PRO_CLEAR: 3655 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3656 break; 3657 case PRO_PREEMPT: 3658 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3659 res_key, sa_res_key, PREEMPT); 3660 break; 3661 case PRO_PREEMPT_AND_ABORT: 3662 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3663 res_key, sa_res_key, PREEMPT_AND_ABORT); 3664 break; 3665 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3666 ret = core_scsi3_emulate_pro_register(cmd, 3667 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3668 break; 3669 case PRO_REGISTER_AND_MOVE: 3670 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3671 sa_res_key, aptpl, unreg); 3672 break; 3673 default: 3674 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3675 " action: 0x%02x\n", cdb[1] & 0x1f); 3676 return TCM_INVALID_CDB_FIELD; 3677 } 3678 3679 if (!ret) 3680 target_complete_cmd(cmd, GOOD); 3681 return ret; 3682 } 3683 3684 /* 3685 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3686 * 3687 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3688 */ 3689 static sense_reason_t 3690 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3691 { 3692 struct se_device *dev = cmd->se_dev; 3693 struct t10_pr_registration *pr_reg; 3694 unsigned char *buf; 3695 u32 add_len = 0, off = 8; 3696 3697 if (cmd->data_length < 8) { 3698 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3699 " too small\n", cmd->data_length); 3700 return TCM_INVALID_CDB_FIELD; 3701 } 3702 3703 buf = transport_kmap_data_sg(cmd); 3704 if (!buf) 3705 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3706 3707 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3708 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3709 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3710 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3711 3712 spin_lock(&dev->t10_pr.registration_lock); 3713 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3714 pr_reg_list) { 3715 /* 3716 * Check for overflow of 8byte PRI READ_KEYS payload and 3717 * next reservation key list descriptor. 3718 */ 3719 if ((add_len + 8) > (cmd->data_length - 8)) 3720 break; 3721 3722 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3723 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3724 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3725 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3726 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3727 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3728 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3729 buf[off++] = (pr_reg->pr_res_key & 0xff); 3730 3731 add_len += 8; 3732 } 3733 spin_unlock(&dev->t10_pr.registration_lock); 3734 3735 buf[4] = ((add_len >> 24) & 0xff); 3736 buf[5] = ((add_len >> 16) & 0xff); 3737 buf[6] = ((add_len >> 8) & 0xff); 3738 buf[7] = (add_len & 0xff); 3739 3740 transport_kunmap_data_sg(cmd); 3741 3742 return 0; 3743 } 3744 3745 /* 3746 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3747 * 3748 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3749 */ 3750 static sense_reason_t 3751 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3752 { 3753 struct se_device *dev = cmd->se_dev; 3754 struct t10_pr_registration *pr_reg; 3755 unsigned char *buf; 3756 u64 pr_res_key; 3757 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3758 3759 if (cmd->data_length < 8) { 3760 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3761 " too small\n", cmd->data_length); 3762 return TCM_INVALID_CDB_FIELD; 3763 } 3764 3765 buf = transport_kmap_data_sg(cmd); 3766 if (!buf) 3767 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3768 3769 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3770 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3771 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3772 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3773 3774 spin_lock(&dev->dev_reservation_lock); 3775 pr_reg = dev->dev_pr_res_holder; 3776 if (pr_reg) { 3777 /* 3778 * Set the hardcoded Additional Length 3779 */ 3780 buf[4] = ((add_len >> 24) & 0xff); 3781 buf[5] = ((add_len >> 16) & 0xff); 3782 buf[6] = ((add_len >> 8) & 0xff); 3783 buf[7] = (add_len & 0xff); 3784 3785 if (cmd->data_length < 22) 3786 goto err; 3787 3788 /* 3789 * Set the Reservation key. 3790 * 3791 * From spc4r17, section 5.7.10: 3792 * A persistent reservation holder has its reservation key 3793 * returned in the parameter data from a PERSISTENT 3794 * RESERVE IN command with READ RESERVATION service action as 3795 * follows: 3796 * a) For a persistent reservation of the type Write Exclusive 3797 * - All Registrants or Exclusive Access All Regitrants, 3798 * the reservation key shall be set to zero; or 3799 * b) For all other persistent reservation types, the 3800 * reservation key shall be set to the registered 3801 * reservation key for the I_T nexus that holds the 3802 * persistent reservation. 3803 */ 3804 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3805 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3806 pr_res_key = 0; 3807 else 3808 pr_res_key = pr_reg->pr_res_key; 3809 3810 buf[8] = ((pr_res_key >> 56) & 0xff); 3811 buf[9] = ((pr_res_key >> 48) & 0xff); 3812 buf[10] = ((pr_res_key >> 40) & 0xff); 3813 buf[11] = ((pr_res_key >> 32) & 0xff); 3814 buf[12] = ((pr_res_key >> 24) & 0xff); 3815 buf[13] = ((pr_res_key >> 16) & 0xff); 3816 buf[14] = ((pr_res_key >> 8) & 0xff); 3817 buf[15] = (pr_res_key & 0xff); 3818 /* 3819 * Set the SCOPE and TYPE 3820 */ 3821 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3822 (pr_reg->pr_res_type & 0x0f); 3823 } 3824 3825 err: 3826 spin_unlock(&dev->dev_reservation_lock); 3827 transport_kunmap_data_sg(cmd); 3828 3829 return 0; 3830 } 3831 3832 /* 3833 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3834 * 3835 * See spc4r17 section 6.13.4 Table 165 3836 */ 3837 static sense_reason_t 3838 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3839 { 3840 struct se_device *dev = cmd->se_dev; 3841 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3842 unsigned char *buf; 3843 u16 add_len = 8; /* Hardcoded to 8. */ 3844 3845 if (cmd->data_length < 6) { 3846 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3847 " %u too small\n", cmd->data_length); 3848 return TCM_INVALID_CDB_FIELD; 3849 } 3850 3851 buf = transport_kmap_data_sg(cmd); 3852 if (!buf) 3853 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3854 3855 buf[0] = ((add_len >> 8) & 0xff); 3856 buf[1] = (add_len & 0xff); 3857 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3858 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3859 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3860 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3861 /* 3862 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3863 * set the TMV: Task Mask Valid bit. 3864 */ 3865 buf[3] |= 0x80; 3866 /* 3867 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3868 */ 3869 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3870 /* 3871 * PTPL_A: Persistence across Target Power Loss Active bit 3872 */ 3873 if (pr_tmpl->pr_aptpl_active) 3874 buf[3] |= 0x01; 3875 /* 3876 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3877 */ 3878 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3879 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3880 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3881 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3882 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3883 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3884 3885 transport_kunmap_data_sg(cmd); 3886 3887 return 0; 3888 } 3889 3890 /* 3891 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3892 * 3893 * See spc4r17 section 6.13.5 Table 168 and 169 3894 */ 3895 static sense_reason_t 3896 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3897 { 3898 struct se_device *dev = cmd->se_dev; 3899 struct se_node_acl *se_nacl; 3900 struct se_portal_group *se_tpg; 3901 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3902 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3903 unsigned char *buf; 3904 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3905 u32 off = 8; /* off into first Full Status descriptor */ 3906 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3907 bool all_reg = false; 3908 3909 if (cmd->data_length < 8) { 3910 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3911 " too small\n", cmd->data_length); 3912 return TCM_INVALID_CDB_FIELD; 3913 } 3914 3915 buf = transport_kmap_data_sg(cmd); 3916 if (!buf) 3917 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3918 3919 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3920 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3921 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3922 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3923 3924 spin_lock(&dev->dev_reservation_lock); 3925 if (dev->dev_pr_res_holder) { 3926 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3927 3928 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3929 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3930 all_reg = true; 3931 pr_res_type = pr_holder->pr_res_type; 3932 pr_res_scope = pr_holder->pr_res_scope; 3933 } 3934 } 3935 spin_unlock(&dev->dev_reservation_lock); 3936 3937 spin_lock(&pr_tmpl->registration_lock); 3938 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3939 &pr_tmpl->registration_list, pr_reg_list) { 3940 3941 se_nacl = pr_reg->pr_reg_nacl; 3942 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3943 add_desc_len = 0; 3944 3945 atomic_inc_mb(&pr_reg->pr_res_holders); 3946 spin_unlock(&pr_tmpl->registration_lock); 3947 /* 3948 * Determine expected length of $FABRIC_MOD specific 3949 * TransportID full status descriptor.. 3950 */ 3951 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3952 se_tpg, se_nacl, pr_reg, &format_code); 3953 3954 if ((exp_desc_len + add_len) > cmd->data_length) { 3955 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3956 " out of buffer: %d\n", cmd->data_length); 3957 spin_lock(&pr_tmpl->registration_lock); 3958 atomic_dec_mb(&pr_reg->pr_res_holders); 3959 break; 3960 } 3961 /* 3962 * Set RESERVATION KEY 3963 */ 3964 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3965 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3966 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3967 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3968 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3969 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3970 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3971 buf[off++] = (pr_reg->pr_res_key & 0xff); 3972 off += 4; /* Skip Over Reserved area */ 3973 3974 /* 3975 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3976 */ 3977 if (pr_reg->pr_reg_all_tg_pt) 3978 buf[off] = 0x02; 3979 /* 3980 * The struct se_lun pointer will be present for the 3981 * reservation holder for PR_HOLDER bit. 3982 * 3983 * Also, if this registration is the reservation 3984 * holder or there is an All Registrants reservation 3985 * active, fill in SCOPE and TYPE in the next byte. 3986 */ 3987 if (pr_reg->pr_res_holder) { 3988 buf[off++] |= 0x01; 3989 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3990 (pr_reg->pr_res_type & 0x0f); 3991 } else if (all_reg) { 3992 buf[off++] |= 0x01; 3993 buf[off++] = (pr_res_scope & 0xf0) | 3994 (pr_res_type & 0x0f); 3995 } else { 3996 off += 2; 3997 } 3998 3999 off += 4; /* Skip over reserved area */ 4000 /* 4001 * From spc4r17 6.3.15: 4002 * 4003 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4004 * IDENTIFIER field contains the relative port identifier (see 4005 * 3.1.120) of the target port that is part of the I_T nexus 4006 * described by this full status descriptor. If the ALL_TG_PT 4007 * bit is set to one, the contents of the RELATIVE TARGET PORT 4008 * IDENTIFIER field are not defined by this standard. 4009 */ 4010 if (!pr_reg->pr_reg_all_tg_pt) { 4011 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4012 4013 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4014 buf[off++] = (port->sep_rtpi & 0xff); 4015 } else 4016 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4017 4018 /* 4019 * Now, have the $FABRIC_MOD fill in the protocol identifier 4020 */ 4021 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4022 se_nacl, pr_reg, &format_code, &buf[off+4]); 4023 4024 spin_lock(&pr_tmpl->registration_lock); 4025 atomic_dec_mb(&pr_reg->pr_res_holders); 4026 /* 4027 * Set the ADDITIONAL DESCRIPTOR LENGTH 4028 */ 4029 buf[off++] = ((desc_len >> 24) & 0xff); 4030 buf[off++] = ((desc_len >> 16) & 0xff); 4031 buf[off++] = ((desc_len >> 8) & 0xff); 4032 buf[off++] = (desc_len & 0xff); 4033 /* 4034 * Size of full desctipor header minus TransportID 4035 * containing $FABRIC_MOD specific) initiator device/port 4036 * WWN information. 4037 * 4038 * See spc4r17 Section 6.13.5 Table 169 4039 */ 4040 add_desc_len = (24 + desc_len); 4041 4042 off += desc_len; 4043 add_len += add_desc_len; 4044 } 4045 spin_unlock(&pr_tmpl->registration_lock); 4046 /* 4047 * Set ADDITIONAL_LENGTH 4048 */ 4049 buf[4] = ((add_len >> 24) & 0xff); 4050 buf[5] = ((add_len >> 16) & 0xff); 4051 buf[6] = ((add_len >> 8) & 0xff); 4052 buf[7] = (add_len & 0xff); 4053 4054 transport_kunmap_data_sg(cmd); 4055 4056 return 0; 4057 } 4058 4059 sense_reason_t 4060 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4061 { 4062 sense_reason_t ret; 4063 4064 /* 4065 * Following spc2r20 5.5.1 Reservations overview: 4066 * 4067 * If a logical unit has been reserved by any RESERVE command and is 4068 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4069 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4070 * initiator or service action and shall terminate with a RESERVATION 4071 * CONFLICT status. 4072 */ 4073 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4074 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4075 " SPC-2 reservation is held, returning" 4076 " RESERVATION_CONFLICT\n"); 4077 return TCM_RESERVATION_CONFLICT; 4078 } 4079 4080 switch (cmd->t_task_cdb[1] & 0x1f) { 4081 case PRI_READ_KEYS: 4082 ret = core_scsi3_pri_read_keys(cmd); 4083 break; 4084 case PRI_READ_RESERVATION: 4085 ret = core_scsi3_pri_read_reservation(cmd); 4086 break; 4087 case PRI_REPORT_CAPABILITIES: 4088 ret = core_scsi3_pri_report_capabilities(cmd); 4089 break; 4090 case PRI_READ_FULL_STATUS: 4091 ret = core_scsi3_pri_read_full_status(cmd); 4092 break; 4093 default: 4094 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4095 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4096 return TCM_INVALID_CDB_FIELD; 4097 } 4098 4099 if (!ret) 4100 target_complete_cmd(cmd, GOOD); 4101 return ret; 4102 } 4103 4104 sense_reason_t 4105 target_check_reservation(struct se_cmd *cmd) 4106 { 4107 struct se_device *dev = cmd->se_dev; 4108 sense_reason_t ret; 4109 4110 if (!cmd->se_sess) 4111 return 0; 4112 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4113 return 0; 4114 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 4115 return 0; 4116 4117 spin_lock(&dev->dev_reservation_lock); 4118 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4119 ret = target_scsi2_reservation_check(cmd); 4120 else 4121 ret = target_scsi3_pr_reservation_check(cmd); 4122 spin_unlock(&dev->dev_reservation_lock); 4123 4124 return ret; 4125 } 4126