1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/file.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 39 #include "target_core_internal.h" 40 #include "target_core_pr.h" 41 #include "target_core_ua.h" 42 43 /* 44 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 45 */ 46 struct pr_transport_id_holder { 47 struct t10_pr_registration *dest_pr_reg; 48 struct se_portal_group *dest_tpg; 49 struct se_node_acl *dest_node_acl; 50 struct se_dev_entry *dest_se_deve; 51 struct list_head dest_list; 52 }; 53 54 void core_pr_dump_initiator_port( 55 struct t10_pr_registration *pr_reg, 56 char *buf, 57 u32 size) 58 { 59 if (!pr_reg->isid_present_at_reg) 60 buf[0] = '\0'; 61 62 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 63 } 64 65 enum register_type { 66 REGISTER, 67 REGISTER_AND_IGNORE_EXISTING_KEY, 68 REGISTER_AND_MOVE, 69 }; 70 71 enum preempt_type { 72 PREEMPT, 73 PREEMPT_AND_ABORT, 74 }; 75 76 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 77 struct t10_pr_registration *, int, int); 78 79 static int is_reservation_holder( 80 struct t10_pr_registration *pr_res_holder, 81 struct t10_pr_registration *pr_reg) 82 { 83 int pr_res_type; 84 85 if (pr_res_holder) { 86 pr_res_type = pr_res_holder->pr_res_type; 87 88 return pr_res_holder == pr_reg || 89 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 90 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 91 } 92 return 0; 93 } 94 95 static sense_reason_t 96 target_scsi2_reservation_check(struct se_cmd *cmd) 97 { 98 struct se_device *dev = cmd->se_dev; 99 struct se_session *sess = cmd->se_sess; 100 101 switch (cmd->t_task_cdb[0]) { 102 case INQUIRY: 103 case RELEASE: 104 case RELEASE_10: 105 return 0; 106 default: 107 break; 108 } 109 110 if (!dev->dev_reserved_node_acl || !sess) 111 return 0; 112 113 if (dev->dev_reserved_node_acl != sess->se_node_acl) 114 return TCM_RESERVATION_CONFLICT; 115 116 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 117 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 118 return TCM_RESERVATION_CONFLICT; 119 } 120 121 return 0; 122 } 123 124 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 125 struct se_node_acl *, struct se_session *); 126 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 127 128 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 129 { 130 struct se_session *se_sess = cmd->se_sess; 131 struct se_device *dev = cmd->se_dev; 132 struct t10_pr_registration *pr_reg; 133 struct t10_reservation *pr_tmpl = &dev->t10_pr; 134 int conflict = 0; 135 136 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 137 se_sess); 138 if (pr_reg) { 139 /* 140 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 141 * behavior 142 * 143 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 144 * status, but no reservation shall be established and the 145 * persistent reservation shall not be changed, if the command 146 * is received from a) and b) below. 147 * 148 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 149 * status, but the persistent reservation shall not be released, 150 * if the command is received from a) and b) 151 * 152 * a) An I_T nexus that is a persistent reservation holder; or 153 * b) An I_T nexus that is registered if a registrants only or 154 * all registrants type persistent reservation is present. 155 * 156 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 157 * RELEASE(6) command, or RELEASE(10) command shall be processed 158 * as defined in SPC-2. 159 */ 160 if (pr_reg->pr_res_holder) { 161 core_scsi3_put_pr_reg(pr_reg); 162 return 1; 163 } 164 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 165 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 166 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 168 core_scsi3_put_pr_reg(pr_reg); 169 return 1; 170 } 171 core_scsi3_put_pr_reg(pr_reg); 172 conflict = 1; 173 } else { 174 /* 175 * Following spc2r20 5.5.1 Reservations overview: 176 * 177 * If a logical unit has executed a PERSISTENT RESERVE OUT 178 * command with the REGISTER or the REGISTER AND IGNORE 179 * EXISTING KEY service action and is still registered by any 180 * initiator, all RESERVE commands and all RELEASE commands 181 * regardless of initiator shall conflict and shall terminate 182 * with a RESERVATION CONFLICT status. 183 */ 184 spin_lock(&pr_tmpl->registration_lock); 185 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 186 spin_unlock(&pr_tmpl->registration_lock); 187 } 188 189 if (conflict) { 190 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 191 " while active SPC-3 registrations exist," 192 " returning RESERVATION_CONFLICT\n"); 193 return -EBUSY; 194 } 195 196 return 0; 197 } 198 199 sense_reason_t 200 target_scsi2_reservation_release(struct se_cmd *cmd) 201 { 202 struct se_device *dev = cmd->se_dev; 203 struct se_session *sess = cmd->se_sess; 204 struct se_portal_group *tpg; 205 int rc; 206 207 if (!sess || !sess->se_tpg) 208 goto out; 209 rc = target_check_scsi2_reservation_conflict(cmd); 210 if (rc == 1) 211 goto out; 212 if (rc < 0) 213 return TCM_RESERVATION_CONFLICT; 214 215 spin_lock(&dev->dev_reservation_lock); 216 if (!dev->dev_reserved_node_acl || !sess) 217 goto out_unlock; 218 219 if (dev->dev_reserved_node_acl != sess->se_node_acl) 220 goto out_unlock; 221 222 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 223 goto out_unlock; 224 225 dev->dev_reserved_node_acl = NULL; 226 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 227 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 228 dev->dev_res_bin_isid = 0; 229 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 230 } 231 tpg = sess->se_tpg; 232 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 233 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 234 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 235 sess->se_node_acl->initiatorname); 236 237 out_unlock: 238 spin_unlock(&dev->dev_reservation_lock); 239 out: 240 target_complete_cmd(cmd, GOOD); 241 return 0; 242 } 243 244 sense_reason_t 245 target_scsi2_reservation_reserve(struct se_cmd *cmd) 246 { 247 struct se_device *dev = cmd->se_dev; 248 struct se_session *sess = cmd->se_sess; 249 struct se_portal_group *tpg; 250 sense_reason_t ret = 0; 251 int rc; 252 253 if ((cmd->t_task_cdb[1] & 0x01) && 254 (cmd->t_task_cdb[1] & 0x02)) { 255 pr_err("LongIO and Obselete Bits set, returning" 256 " ILLEGAL_REQUEST\n"); 257 return TCM_UNSUPPORTED_SCSI_OPCODE; 258 } 259 /* 260 * This is currently the case for target_core_mod passthrough struct se_cmd 261 * ops 262 */ 263 if (!sess || !sess->se_tpg) 264 goto out; 265 rc = target_check_scsi2_reservation_conflict(cmd); 266 if (rc == 1) 267 goto out; 268 269 if (rc < 0) 270 return TCM_RESERVATION_CONFLICT; 271 272 tpg = sess->se_tpg; 273 spin_lock(&dev->dev_reservation_lock); 274 if (dev->dev_reserved_node_acl && 275 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 276 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 277 tpg->se_tpg_tfo->get_fabric_name()); 278 pr_err("Original reserver LUN: %u %s\n", 279 cmd->se_lun->unpacked_lun, 280 dev->dev_reserved_node_acl->initiatorname); 281 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 282 " from %s \n", cmd->se_lun->unpacked_lun, 283 cmd->orig_fe_lun, 284 sess->se_node_acl->initiatorname); 285 ret = TCM_RESERVATION_CONFLICT; 286 goto out_unlock; 287 } 288 289 dev->dev_reserved_node_acl = sess->se_node_acl; 290 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 291 if (sess->sess_bin_isid != 0) { 292 dev->dev_res_bin_isid = sess->sess_bin_isid; 293 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 294 } 295 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 296 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 297 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 298 sess->se_node_acl->initiatorname); 299 300 out_unlock: 301 spin_unlock(&dev->dev_reservation_lock); 302 out: 303 if (!ret) 304 target_complete_cmd(cmd, GOOD); 305 return ret; 306 } 307 308 309 /* 310 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 311 * 312 * This function is called by those initiator ports who are *NOT* 313 * the active PR reservation holder when a reservation is present. 314 */ 315 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 316 bool isid_mismatch) 317 { 318 unsigned char *cdb = cmd->t_task_cdb; 319 struct se_session *se_sess = cmd->se_sess; 320 struct se_node_acl *nacl = se_sess->se_node_acl; 321 int other_cdb = 0; 322 int registered_nexus = 0, ret = 1; /* Conflict by default */ 323 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 324 int we = 0; /* Write Exclusive */ 325 int legacy = 0; /* Act like a legacy device and return 326 * RESERVATION CONFLICT on some CDBs */ 327 328 if (isid_mismatch) { 329 registered_nexus = 0; 330 } else { 331 struct se_dev_entry *se_deve; 332 333 rcu_read_lock(); 334 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 335 if (se_deve) 336 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 337 &se_deve->deve_flags); 338 rcu_read_unlock(); 339 } 340 341 switch (pr_reg_type) { 342 case PR_TYPE_WRITE_EXCLUSIVE: 343 we = 1; 344 case PR_TYPE_EXCLUSIVE_ACCESS: 345 /* 346 * Some commands are only allowed for the persistent reservation 347 * holder. 348 */ 349 break; 350 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 351 we = 1; 352 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 353 /* 354 * Some commands are only allowed for registered I_T Nexuses. 355 */ 356 reg_only = 1; 357 break; 358 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 359 we = 1; 360 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 361 /* 362 * Each registered I_T Nexus is a reservation holder. 363 */ 364 all_reg = 1; 365 break; 366 default: 367 return -EINVAL; 368 } 369 /* 370 * Referenced from spc4r17 table 45 for *NON* PR holder access 371 */ 372 switch (cdb[0]) { 373 case SECURITY_PROTOCOL_IN: 374 if (registered_nexus) 375 return 0; 376 ret = (we) ? 0 : 1; 377 break; 378 case MODE_SENSE: 379 case MODE_SENSE_10: 380 case READ_ATTRIBUTE: 381 case READ_BUFFER: 382 case RECEIVE_DIAGNOSTIC: 383 if (legacy) { 384 ret = 1; 385 break; 386 } 387 if (registered_nexus) { 388 ret = 0; 389 break; 390 } 391 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 392 break; 393 case PERSISTENT_RESERVE_OUT: 394 /* 395 * This follows PERSISTENT_RESERVE_OUT service actions that 396 * are allowed in the presence of various reservations. 397 * See spc4r17, table 46 398 */ 399 switch (cdb[1] & 0x1f) { 400 case PRO_CLEAR: 401 case PRO_PREEMPT: 402 case PRO_PREEMPT_AND_ABORT: 403 ret = (registered_nexus) ? 0 : 1; 404 break; 405 case PRO_REGISTER: 406 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 407 ret = 0; 408 break; 409 case PRO_REGISTER_AND_MOVE: 410 case PRO_RESERVE: 411 ret = 1; 412 break; 413 case PRO_RELEASE: 414 ret = (registered_nexus) ? 0 : 1; 415 break; 416 default: 417 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 418 " action: 0x%02x\n", cdb[1] & 0x1f); 419 return -EINVAL; 420 } 421 break; 422 case RELEASE: 423 case RELEASE_10: 424 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 425 ret = 0; 426 break; 427 case RESERVE: 428 case RESERVE_10: 429 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 430 ret = 0; 431 break; 432 case TEST_UNIT_READY: 433 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 434 break; 435 case MAINTENANCE_IN: 436 switch (cdb[1] & 0x1f) { 437 case MI_MANAGEMENT_PROTOCOL_IN: 438 if (registered_nexus) { 439 ret = 0; 440 break; 441 } 442 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 443 break; 444 case MI_REPORT_SUPPORTED_OPERATION_CODES: 445 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 446 if (legacy) { 447 ret = 1; 448 break; 449 } 450 if (registered_nexus) { 451 ret = 0; 452 break; 453 } 454 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 455 break; 456 case MI_REPORT_ALIASES: 457 case MI_REPORT_IDENTIFYING_INFORMATION: 458 case MI_REPORT_PRIORITY: 459 case MI_REPORT_TARGET_PGS: 460 case MI_REPORT_TIMESTAMP: 461 ret = 0; /* Allowed */ 462 break; 463 default: 464 pr_err("Unknown MI Service Action: 0x%02x\n", 465 (cdb[1] & 0x1f)); 466 return -EINVAL; 467 } 468 break; 469 case ACCESS_CONTROL_IN: 470 case ACCESS_CONTROL_OUT: 471 case INQUIRY: 472 case LOG_SENSE: 473 case SERVICE_ACTION_IN_12: 474 case REPORT_LUNS: 475 case REQUEST_SENSE: 476 case PERSISTENT_RESERVE_IN: 477 ret = 0; /*/ Allowed CDBs */ 478 break; 479 default: 480 other_cdb = 1; 481 break; 482 } 483 /* 484 * Case where the CDB is explicitly allowed in the above switch 485 * statement. 486 */ 487 if (!ret && !other_cdb) { 488 pr_debug("Allowing explicit CDB: 0x%02x for %s" 489 " reservation holder\n", cdb[0], 490 core_scsi3_pr_dump_type(pr_reg_type)); 491 492 return ret; 493 } 494 /* 495 * Check if write exclusive initiator ports *NOT* holding the 496 * WRITE_EXCLUSIVE_* reservation. 497 */ 498 if (we && !registered_nexus) { 499 if (cmd->data_direction == DMA_TO_DEVICE) { 500 /* 501 * Conflict for write exclusive 502 */ 503 pr_debug("%s Conflict for unregistered nexus" 504 " %s CDB: 0x%02x to %s reservation\n", 505 transport_dump_cmd_direction(cmd), 506 se_sess->se_node_acl->initiatorname, cdb[0], 507 core_scsi3_pr_dump_type(pr_reg_type)); 508 return 1; 509 } else { 510 /* 511 * Allow non WRITE CDBs for all Write Exclusive 512 * PR TYPEs to pass for registered and 513 * non-registered_nexuxes NOT holding the reservation. 514 * 515 * We only make noise for the unregisterd nexuses, 516 * as we expect registered non-reservation holding 517 * nexuses to issue CDBs. 518 */ 519 520 if (!registered_nexus) { 521 pr_debug("Allowing implicit CDB: 0x%02x" 522 " for %s reservation on unregistered" 523 " nexus\n", cdb[0], 524 core_scsi3_pr_dump_type(pr_reg_type)); 525 } 526 527 return 0; 528 } 529 } else if ((reg_only) || (all_reg)) { 530 if (registered_nexus) { 531 /* 532 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 533 * allow commands from registered nexuses. 534 */ 535 536 pr_debug("Allowing implicit CDB: 0x%02x for %s" 537 " reservation\n", cdb[0], 538 core_scsi3_pr_dump_type(pr_reg_type)); 539 540 return 0; 541 } 542 } else if (we && registered_nexus) { 543 /* 544 * Reads are allowed for Write Exclusive locks 545 * from all registrants. 546 */ 547 if (cmd->data_direction == DMA_FROM_DEVICE) { 548 pr_debug("Allowing READ CDB: 0x%02x for %s" 549 " reservation\n", cdb[0], 550 core_scsi3_pr_dump_type(pr_reg_type)); 551 552 return 0; 553 } 554 } 555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 556 " for %s reservation\n", transport_dump_cmd_direction(cmd), 557 (registered_nexus) ? "" : "un", 558 se_sess->se_node_acl->initiatorname, cdb[0], 559 core_scsi3_pr_dump_type(pr_reg_type)); 560 561 return 1; /* Conflict by default */ 562 } 563 564 static sense_reason_t 565 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 566 { 567 struct se_device *dev = cmd->se_dev; 568 struct se_session *sess = cmd->se_sess; 569 u32 pr_reg_type; 570 bool isid_mismatch = false; 571 572 if (!dev->dev_pr_res_holder) 573 return 0; 574 575 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 576 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 577 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 578 goto check_nonholder; 579 580 if (dev->dev_pr_res_holder->isid_present_at_reg) { 581 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 582 sess->sess_bin_isid) { 583 isid_mismatch = true; 584 goto check_nonholder; 585 } 586 } 587 588 return 0; 589 590 check_nonholder: 591 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 592 return TCM_RESERVATION_CONFLICT; 593 return 0; 594 } 595 596 static u32 core_scsi3_pr_generation(struct se_device *dev) 597 { 598 u32 prg; 599 600 /* 601 * PRGeneration field shall contain the value of a 32-bit wrapping 602 * counter mainted by the device server. 603 * 604 * Note that this is done regardless of Active Persist across 605 * Target PowerLoss (APTPL) 606 * 607 * See spc4r17 section 6.3.12 READ_KEYS service action 608 */ 609 spin_lock(&dev->dev_reservation_lock); 610 prg = dev->t10_pr.pr_generation++; 611 spin_unlock(&dev->dev_reservation_lock); 612 613 return prg; 614 } 615 616 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 617 struct se_device *dev, 618 struct se_node_acl *nacl, 619 struct se_lun *lun, 620 struct se_dev_entry *deve, 621 u32 mapped_lun, 622 unsigned char *isid, 623 u64 sa_res_key, 624 int all_tg_pt, 625 int aptpl) 626 { 627 struct t10_pr_registration *pr_reg; 628 629 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 630 if (!pr_reg) { 631 pr_err("Unable to allocate struct t10_pr_registration\n"); 632 return NULL; 633 } 634 635 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 636 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 637 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 640 atomic_set(&pr_reg->pr_res_holders, 0); 641 pr_reg->pr_reg_nacl = nacl; 642 pr_reg->pr_reg_deve = deve; 643 pr_reg->pr_res_mapped_lun = mapped_lun; 644 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 645 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 646 pr_reg->pr_res_key = sa_res_key; 647 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 648 pr_reg->pr_reg_aptpl = aptpl; 649 /* 650 * If an ISID value for this SCSI Initiator Port exists, 651 * save it to the registration now. 652 */ 653 if (isid != NULL) { 654 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 655 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 656 pr_reg->isid_present_at_reg = 1; 657 } 658 659 return pr_reg; 660 } 661 662 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 663 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 664 665 /* 666 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 667 * modes. 668 */ 669 static struct t10_pr_registration *__core_scsi3_alloc_registration( 670 struct se_device *dev, 671 struct se_node_acl *nacl, 672 struct se_lun *lun, 673 struct se_dev_entry *deve, 674 u32 mapped_lun, 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_lun_acl *lacl_tmp; 683 struct se_lun *lun_tmp, *next, *dest_lun; 684 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 685 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 686 int ret; 687 /* 688 * Create a registration for the I_T Nexus upon which the 689 * PROUT REGISTER was received. 690 */ 691 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 692 isid, sa_res_key, all_tg_pt, 693 aptpl); 694 if (!pr_reg) 695 return NULL; 696 /* 697 * Return pointer to pr_reg for ALL_TG_PT=0 698 */ 699 if (!all_tg_pt) 700 return pr_reg; 701 /* 702 * Create list of matching SCSI Initiator Port registrations 703 * for ALL_TG_PT=1 704 */ 705 spin_lock(&dev->se_port_lock); 706 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 707 atomic_inc_mb(&lun_tmp->lun_active); 708 spin_unlock(&dev->se_port_lock); 709 710 spin_lock_bh(&lun_tmp->lun_deve_lock); 711 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 712 /* 713 * This pointer will be NULL for demo mode MappedLUNs 714 * that have not been make explicit via a ConfigFS 715 * MappedLUN group for the SCSI Initiator Node ACL. 716 */ 717 if (!deve_tmp->se_lun_acl) 718 continue; 719 720 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 721 lockdep_is_held(&lun_tmp->lun_deve_lock)); 722 nacl_tmp = lacl_tmp->se_lun_nacl; 723 /* 724 * Skip the matching struct se_node_acl that is allocated 725 * above.. 726 */ 727 if (nacl == nacl_tmp) 728 continue; 729 /* 730 * Only perform PR registrations for target ports on 731 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 732 * arrived. 733 */ 734 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 735 continue; 736 /* 737 * Look for a matching Initiator Node ACL in ASCII format 738 */ 739 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 740 continue; 741 742 kref_get(&deve_tmp->pr_kref); 743 spin_unlock_bh(&lun_tmp->lun_deve_lock); 744 /* 745 * Grab a configfs group dependency that is released 746 * for the exception path at label out: below, or upon 747 * completion of adding ALL_TG_PT=1 registrations in 748 * __core_scsi3_add_registration() 749 */ 750 ret = core_scsi3_lunacl_depend_item(deve_tmp); 751 if (ret < 0) { 752 pr_err("core_scsi3_lunacl_depend" 753 "_item() failed\n"); 754 atomic_dec_mb(&lun->lun_active); 755 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 756 goto out; 757 } 758 /* 759 * Located a matching SCSI Initiator Port on a different 760 * port, allocate the pr_reg_atp and attach it to the 761 * pr_reg->pr_reg_atp_list that will be processed once 762 * the original *pr_reg is processed in 763 * __core_scsi3_add_registration() 764 */ 765 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 766 atomic_read(&deve_tmp->pr_kref.refcount) != 0); 767 768 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 769 nacl_tmp, dest_lun, deve_tmp, 770 deve_tmp->mapped_lun, NULL, 771 sa_res_key, all_tg_pt, aptpl); 772 if (!pr_reg_atp) { 773 atomic_dec_mb(&lun_tmp->lun_active); 774 core_scsi3_lunacl_undepend_item(deve_tmp); 775 goto out; 776 } 777 778 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 779 &pr_reg->pr_reg_atp_list); 780 spin_lock_bh(&lun_tmp->lun_deve_lock); 781 } 782 spin_unlock_bh(&lun_tmp->lun_deve_lock); 783 784 spin_lock(&dev->se_port_lock); 785 atomic_dec_mb(&lun_tmp->lun_active); 786 } 787 spin_unlock(&dev->se_port_lock); 788 789 return pr_reg; 790 out: 791 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 792 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 793 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 794 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 795 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 796 } 797 kmem_cache_free(t10_pr_reg_cache, pr_reg); 798 return NULL; 799 } 800 801 int core_scsi3_alloc_aptpl_registration( 802 struct t10_reservation *pr_tmpl, 803 u64 sa_res_key, 804 unsigned char *i_port, 805 unsigned char *isid, 806 u32 mapped_lun, 807 unsigned char *t_port, 808 u16 tpgt, 809 u32 target_lun, 810 int res_holder, 811 int all_tg_pt, 812 u8 type) 813 { 814 struct t10_pr_registration *pr_reg; 815 816 if (!i_port || !t_port || !sa_res_key) { 817 pr_err("Illegal parameters for APTPL registration\n"); 818 return -EINVAL; 819 } 820 821 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 822 if (!pr_reg) { 823 pr_err("Unable to allocate struct t10_pr_registration\n"); 824 return -ENOMEM; 825 } 826 827 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 828 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 829 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 830 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 831 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 832 atomic_set(&pr_reg->pr_res_holders, 0); 833 pr_reg->pr_reg_nacl = NULL; 834 pr_reg->pr_reg_deve = NULL; 835 pr_reg->pr_res_mapped_lun = mapped_lun; 836 pr_reg->pr_aptpl_target_lun = target_lun; 837 pr_reg->pr_res_key = sa_res_key; 838 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 839 pr_reg->pr_reg_aptpl = 1; 840 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 841 pr_reg->pr_res_type = type; 842 /* 843 * If an ISID value had been saved in APTPL metadata for this 844 * SCSI Initiator Port, restore it now. 845 */ 846 if (isid != NULL) { 847 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 848 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 849 pr_reg->isid_present_at_reg = 1; 850 } 851 /* 852 * Copy the i_port and t_port information from caller. 853 */ 854 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 855 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 856 pr_reg->pr_reg_tpgt = tpgt; 857 /* 858 * Set pr_res_holder from caller, the pr_reg who is the reservation 859 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 860 * the Initiator Node LUN ACL from the fabric module is created for 861 * this registration. 862 */ 863 pr_reg->pr_res_holder = res_holder; 864 865 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 866 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 867 " metadata\n", (res_holder) ? "+reservation" : ""); 868 return 0; 869 } 870 871 static void core_scsi3_aptpl_reserve( 872 struct se_device *dev, 873 struct se_portal_group *tpg, 874 struct se_node_acl *node_acl, 875 struct t10_pr_registration *pr_reg) 876 { 877 char i_buf[PR_REG_ISID_ID_LEN]; 878 879 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 880 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 881 882 spin_lock(&dev->dev_reservation_lock); 883 dev->dev_pr_res_holder = pr_reg; 884 spin_unlock(&dev->dev_reservation_lock); 885 886 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 887 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 888 tpg->se_tpg_tfo->get_fabric_name(), 889 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 890 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 891 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 892 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 893 i_buf); 894 } 895 896 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 897 struct t10_pr_registration *, enum register_type, int); 898 899 static int __core_scsi3_check_aptpl_registration( 900 struct se_device *dev, 901 struct se_portal_group *tpg, 902 struct se_lun *lun, 903 u32 target_lun, 904 struct se_node_acl *nacl, 905 u32 mapped_lun) 906 { 907 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 908 struct t10_reservation *pr_tmpl = &dev->t10_pr; 909 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 910 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 911 u16 tpgt; 912 913 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 914 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 915 /* 916 * Copy Initiator Port information from struct se_node_acl 917 */ 918 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 919 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 920 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 921 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 922 /* 923 * Look for the matching registrations+reservation from those 924 * created from APTPL metadata. Note that multiple registrations 925 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 926 * TransportIDs. 927 */ 928 spin_lock(&pr_tmpl->aptpl_reg_lock); 929 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 930 pr_reg_aptpl_list) { 931 932 if (!strcmp(pr_reg->pr_iport, i_port) && 933 (pr_reg->pr_res_mapped_lun == mapped_lun) && 934 !(strcmp(pr_reg->pr_tport, t_port)) && 935 (pr_reg->pr_reg_tpgt == tpgt) && 936 (pr_reg->pr_aptpl_target_lun == target_lun)) { 937 938 pr_reg->pr_reg_nacl = nacl; 939 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 940 941 list_del(&pr_reg->pr_reg_aptpl_list); 942 spin_unlock(&pr_tmpl->aptpl_reg_lock); 943 /* 944 * At this point all of the pointers in *pr_reg will 945 * be setup, so go ahead and add the registration. 946 */ 947 948 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 949 /* 950 * If this registration is the reservation holder, 951 * make that happen now.. 952 */ 953 if (pr_reg->pr_res_holder) 954 core_scsi3_aptpl_reserve(dev, tpg, 955 nacl, pr_reg); 956 /* 957 * Reenable pr_aptpl_active to accept new metadata 958 * updates once the SCSI device is active again.. 959 */ 960 spin_lock(&pr_tmpl->aptpl_reg_lock); 961 pr_tmpl->pr_aptpl_active = 1; 962 } 963 } 964 spin_unlock(&pr_tmpl->aptpl_reg_lock); 965 966 return 0; 967 } 968 969 int core_scsi3_check_aptpl_registration( 970 struct se_device *dev, 971 struct se_portal_group *tpg, 972 struct se_lun *lun, 973 struct se_node_acl *nacl, 974 u32 mapped_lun) 975 { 976 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 977 return 0; 978 979 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 980 lun->unpacked_lun, nacl, 981 mapped_lun); 982 } 983 984 static void __core_scsi3_dump_registration( 985 const struct target_core_fabric_ops *tfo, 986 struct se_device *dev, 987 struct se_node_acl *nacl, 988 struct t10_pr_registration *pr_reg, 989 enum register_type register_type) 990 { 991 struct se_portal_group *se_tpg = nacl->se_tpg; 992 char i_buf[PR_REG_ISID_ID_LEN]; 993 994 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 995 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 996 997 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 998 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 999 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1000 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1001 i_buf); 1002 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1003 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1004 tfo->tpg_get_tag(se_tpg)); 1005 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1006 " Port(s)\n", tfo->get_fabric_name(), 1007 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1008 dev->transport->name); 1009 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1010 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1011 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1012 pr_reg->pr_reg_aptpl); 1013 } 1014 1015 static void __core_scsi3_add_registration( 1016 struct se_device *dev, 1017 struct se_node_acl *nacl, 1018 struct t10_pr_registration *pr_reg, 1019 enum register_type register_type, 1020 int register_move) 1021 { 1022 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1023 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1024 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1025 struct se_dev_entry *deve; 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 1043 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1044 spin_unlock(&pr_tmpl->registration_lock); 1045 1046 rcu_read_lock(); 1047 deve = pr_reg->pr_reg_deve; 1048 if (deve) 1049 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1050 rcu_read_unlock(); 1051 1052 /* 1053 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1054 */ 1055 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1056 return; 1057 /* 1058 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1059 * allocated in __core_scsi3_alloc_registration() 1060 */ 1061 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1062 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1063 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1064 1065 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1066 1067 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1068 1069 spin_lock(&pr_tmpl->registration_lock); 1070 list_add_tail(&pr_reg_tmp->pr_reg_list, 1071 &pr_tmpl->registration_list); 1072 1073 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1074 register_type); 1075 spin_unlock(&pr_tmpl->registration_lock); 1076 1077 rcu_read_lock(); 1078 deve = pr_reg_tmp->pr_reg_deve; 1079 if (deve) 1080 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1081 rcu_read_unlock(); 1082 1083 /* 1084 * Drop configfs group dependency reference from 1085 * __core_scsi3_alloc_registration() 1086 */ 1087 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1088 } 1089 } 1090 1091 static int core_scsi3_alloc_registration( 1092 struct se_device *dev, 1093 struct se_node_acl *nacl, 1094 struct se_lun *lun, 1095 struct se_dev_entry *deve, 1096 u32 mapped_lun, 1097 unsigned char *isid, 1098 u64 sa_res_key, 1099 int all_tg_pt, 1100 int aptpl, 1101 enum register_type register_type, 1102 int register_move) 1103 { 1104 struct t10_pr_registration *pr_reg; 1105 1106 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1107 isid, sa_res_key, all_tg_pt, 1108 aptpl); 1109 if (!pr_reg) 1110 return -EPERM; 1111 1112 __core_scsi3_add_registration(dev, nacl, pr_reg, 1113 register_type, register_move); 1114 return 0; 1115 } 1116 1117 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1118 struct se_device *dev, 1119 struct se_node_acl *nacl, 1120 unsigned char *isid) 1121 { 1122 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1123 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1124 struct se_portal_group *tpg; 1125 1126 spin_lock(&pr_tmpl->registration_lock); 1127 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1128 &pr_tmpl->registration_list, pr_reg_list) { 1129 /* 1130 * First look for a matching struct se_node_acl 1131 */ 1132 if (pr_reg->pr_reg_nacl != nacl) 1133 continue; 1134 1135 tpg = pr_reg->pr_reg_nacl->se_tpg; 1136 /* 1137 * If this registration does NOT contain a fabric provided 1138 * ISID, then we have found a match. 1139 */ 1140 if (!pr_reg->isid_present_at_reg) { 1141 /* 1142 * Determine if this SCSI device server requires that 1143 * SCSI Intiatior TransportID w/ ISIDs is enforced 1144 * for fabric modules (iSCSI) requiring them. 1145 */ 1146 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1147 if (dev->dev_attrib.enforce_pr_isids) 1148 continue; 1149 } 1150 atomic_inc_mb(&pr_reg->pr_res_holders); 1151 spin_unlock(&pr_tmpl->registration_lock); 1152 return pr_reg; 1153 } 1154 /* 1155 * If the *pr_reg contains a fabric defined ISID for multi-value 1156 * SCSI Initiator Port TransportIDs, then we expect a valid 1157 * matching ISID to be provided by the local SCSI Initiator Port. 1158 */ 1159 if (!isid) 1160 continue; 1161 if (strcmp(isid, pr_reg->pr_reg_isid)) 1162 continue; 1163 1164 atomic_inc_mb(&pr_reg->pr_res_holders); 1165 spin_unlock(&pr_tmpl->registration_lock); 1166 return pr_reg; 1167 } 1168 spin_unlock(&pr_tmpl->registration_lock); 1169 1170 return NULL; 1171 } 1172 1173 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1174 struct se_device *dev, 1175 struct se_node_acl *nacl, 1176 struct se_session *sess) 1177 { 1178 struct se_portal_group *tpg = nacl->se_tpg; 1179 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1180 1181 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1182 memset(&buf[0], 0, PR_REG_ISID_LEN); 1183 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1184 PR_REG_ISID_LEN); 1185 isid_ptr = &buf[0]; 1186 } 1187 1188 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1189 } 1190 1191 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1192 { 1193 atomic_dec_mb(&pr_reg->pr_res_holders); 1194 } 1195 1196 static int core_scsi3_check_implicit_release( 1197 struct se_device *dev, 1198 struct t10_pr_registration *pr_reg) 1199 { 1200 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1201 struct t10_pr_registration *pr_res_holder; 1202 int ret = 0; 1203 1204 spin_lock(&dev->dev_reservation_lock); 1205 pr_res_holder = dev->dev_pr_res_holder; 1206 if (!pr_res_holder) { 1207 spin_unlock(&dev->dev_reservation_lock); 1208 return ret; 1209 } 1210 if (pr_res_holder == pr_reg) { 1211 /* 1212 * Perform an implicit RELEASE if the registration that 1213 * is being released is holding the reservation. 1214 * 1215 * From spc4r17, section 5.7.11.1: 1216 * 1217 * e) If the I_T nexus is the persistent reservation holder 1218 * and the persistent reservation is not an all registrants 1219 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1220 * service action or REGISTER AND IGNORE EXISTING KEY 1221 * service action with the SERVICE ACTION RESERVATION KEY 1222 * field set to zero (see 5.7.11.3). 1223 */ 1224 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1225 ret = 1; 1226 /* 1227 * For 'All Registrants' reservation types, all existing 1228 * registrations are still processed as reservation holders 1229 * in core_scsi3_pr_seq_non_holder() after the initial 1230 * reservation holder is implicitly released here. 1231 */ 1232 } else if (pr_reg->pr_reg_all_tg_pt && 1233 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1234 pr_reg->pr_reg_nacl->initiatorname)) && 1235 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1236 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1237 " UNREGISTER while existing reservation with matching" 1238 " key 0x%016Lx is present from another SCSI Initiator" 1239 " Port\n", pr_reg->pr_res_key); 1240 ret = -EPERM; 1241 } 1242 spin_unlock(&dev->dev_reservation_lock); 1243 1244 return ret; 1245 } 1246 1247 /* 1248 * Called with struct t10_reservation->registration_lock held. 1249 */ 1250 static void __core_scsi3_free_registration( 1251 struct se_device *dev, 1252 struct t10_pr_registration *pr_reg, 1253 struct list_head *preempt_and_abort_list, 1254 int dec_holders) 1255 __releases(&pr_tmpl->registration_lock) 1256 __acquires(&pr_tmpl->registration_lock) 1257 { 1258 const struct target_core_fabric_ops *tfo = 1259 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1260 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1261 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1262 struct se_dev_entry *deve; 1263 char i_buf[PR_REG_ISID_ID_LEN]; 1264 1265 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1266 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1267 1268 if (!list_empty(&pr_reg->pr_reg_list)) 1269 list_del(&pr_reg->pr_reg_list); 1270 /* 1271 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1272 * so call core_scsi3_put_pr_reg() to decrement our reference. 1273 */ 1274 if (dec_holders) 1275 core_scsi3_put_pr_reg(pr_reg); 1276 1277 spin_unlock(&pr_tmpl->registration_lock); 1278 /* 1279 * Wait until all reference from any other I_T nexuses for this 1280 * *pr_reg have been released. Because list_del() is called above, 1281 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1282 * count back to zero, and we release *pr_reg. 1283 */ 1284 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1285 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1286 tfo->get_fabric_name()); 1287 cpu_relax(); 1288 } 1289 1290 rcu_read_lock(); 1291 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1292 if (deve) 1293 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1294 rcu_read_unlock(); 1295 1296 spin_lock(&pr_tmpl->registration_lock); 1297 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1298 " Node: %s%s\n", tfo->get_fabric_name(), 1299 pr_reg->pr_reg_nacl->initiatorname, 1300 i_buf); 1301 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1302 " Port(s)\n", tfo->get_fabric_name(), 1303 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1304 dev->transport->name); 1305 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1306 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1307 pr_reg->pr_res_generation); 1308 1309 if (!preempt_and_abort_list) { 1310 pr_reg->pr_reg_deve = NULL; 1311 pr_reg->pr_reg_nacl = NULL; 1312 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1313 return; 1314 } 1315 /* 1316 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1317 * are released once the ABORT_TASK_SET has completed.. 1318 */ 1319 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1320 } 1321 1322 void core_scsi3_free_pr_reg_from_nacl( 1323 struct se_device *dev, 1324 struct se_node_acl *nacl) 1325 { 1326 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1327 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1328 bool free_reg = false; 1329 /* 1330 * If the passed se_node_acl matches the reservation holder, 1331 * release the reservation. 1332 */ 1333 spin_lock(&dev->dev_reservation_lock); 1334 pr_res_holder = dev->dev_pr_res_holder; 1335 if ((pr_res_holder != NULL) && 1336 (pr_res_holder->pr_reg_nacl == nacl)) { 1337 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1338 free_reg = true; 1339 } 1340 spin_unlock(&dev->dev_reservation_lock); 1341 /* 1342 * Release any registration associated with the struct se_node_acl. 1343 */ 1344 spin_lock(&pr_tmpl->registration_lock); 1345 if (pr_res_holder && free_reg) 1346 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1347 1348 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1349 &pr_tmpl->registration_list, pr_reg_list) { 1350 1351 if (pr_reg->pr_reg_nacl != nacl) 1352 continue; 1353 1354 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1355 } 1356 spin_unlock(&pr_tmpl->registration_lock); 1357 } 1358 1359 void core_scsi3_free_all_registrations( 1360 struct se_device *dev) 1361 { 1362 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1363 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1364 1365 spin_lock(&dev->dev_reservation_lock); 1366 pr_res_holder = dev->dev_pr_res_holder; 1367 if (pr_res_holder != NULL) { 1368 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1369 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1370 pr_res_holder, 0, 0); 1371 } 1372 spin_unlock(&dev->dev_reservation_lock); 1373 1374 spin_lock(&pr_tmpl->registration_lock); 1375 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1376 &pr_tmpl->registration_list, pr_reg_list) { 1377 1378 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1379 } 1380 spin_unlock(&pr_tmpl->registration_lock); 1381 1382 spin_lock(&pr_tmpl->aptpl_reg_lock); 1383 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1384 pr_reg_aptpl_list) { 1385 list_del(&pr_reg->pr_reg_aptpl_list); 1386 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1387 } 1388 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1389 } 1390 1391 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1392 { 1393 return target_depend_item(&tpg->tpg_group.cg_item); 1394 } 1395 1396 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1397 { 1398 target_undepend_item(&tpg->tpg_group.cg_item); 1399 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1400 } 1401 1402 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1403 { 1404 if (nacl->dynamic_node_acl) 1405 return 0; 1406 return target_depend_item(&nacl->acl_group.cg_item); 1407 } 1408 1409 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1410 { 1411 if (!nacl->dynamic_node_acl) 1412 target_undepend_item(&nacl->acl_group.cg_item); 1413 atomic_dec_mb(&nacl->acl_pr_ref_count); 1414 } 1415 1416 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1417 { 1418 struct se_lun_acl *lun_acl; 1419 struct se_node_acl *nacl; 1420 struct se_portal_group *tpg; 1421 /* 1422 * For nacl->dynamic_node_acl=1 1423 */ 1424 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1425 atomic_read(&se_deve->pr_kref.refcount) != 0); 1426 if (!lun_acl) 1427 return 0; 1428 1429 nacl = lun_acl->se_lun_nacl; 1430 tpg = nacl->se_tpg; 1431 1432 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1433 } 1434 1435 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1436 { 1437 struct se_lun_acl *lun_acl; 1438 struct se_node_acl *nacl; 1439 struct se_portal_group *tpg; 1440 /* 1441 * For nacl->dynamic_node_acl=1 1442 */ 1443 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1444 atomic_read(&se_deve->pr_kref.refcount) != 0); 1445 if (!lun_acl) { 1446 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1447 return; 1448 } 1449 nacl = lun_acl->se_lun_nacl; 1450 tpg = nacl->se_tpg; 1451 1452 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1453 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1454 } 1455 1456 static sense_reason_t 1457 core_scsi3_decode_spec_i_port( 1458 struct se_cmd *cmd, 1459 struct se_portal_group *tpg, 1460 unsigned char *l_isid, 1461 u64 sa_res_key, 1462 int all_tg_pt, 1463 int aptpl) 1464 { 1465 struct se_device *dev = cmd->se_dev; 1466 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1467 struct se_session *se_sess = cmd->se_sess; 1468 struct se_node_acl *dest_node_acl = NULL; 1469 struct se_dev_entry *dest_se_deve = NULL; 1470 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1471 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1472 LIST_HEAD(tid_dest_list); 1473 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1474 unsigned char *buf, *ptr, proto_ident; 1475 const unsigned char *i_str; 1476 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1477 sense_reason_t ret; 1478 u32 tpdl, tid_len = 0; 1479 u32 dest_rtpi = 0; 1480 1481 /* 1482 * Allocate a struct pr_transport_id_holder and setup the 1483 * local_node_acl pointer and add to struct list_head tid_dest_list 1484 * for add registration processing in the loop of tid_dest_list below. 1485 */ 1486 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1487 if (!tidh_new) { 1488 pr_err("Unable to allocate tidh_new\n"); 1489 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1490 } 1491 INIT_LIST_HEAD(&tidh_new->dest_list); 1492 tidh_new->dest_tpg = tpg; 1493 tidh_new->dest_node_acl = se_sess->se_node_acl; 1494 1495 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1496 se_sess->se_node_acl, cmd->se_lun, 1497 NULL, cmd->orig_fe_lun, l_isid, 1498 sa_res_key, all_tg_pt, aptpl); 1499 if (!local_pr_reg) { 1500 kfree(tidh_new); 1501 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1502 } 1503 tidh_new->dest_pr_reg = local_pr_reg; 1504 /* 1505 * The local I_T nexus does not hold any configfs dependances, 1506 * so we set tidh_new->dest_se_deve to NULL to prevent the 1507 * configfs_undepend_item() calls in the tid_dest_list loops below. 1508 */ 1509 tidh_new->dest_se_deve = NULL; 1510 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1511 1512 if (cmd->data_length < 28) { 1513 pr_warn("SPC-PR: Received PR OUT parameter list" 1514 " length too small: %u\n", cmd->data_length); 1515 ret = TCM_INVALID_PARAMETER_LIST; 1516 goto out; 1517 } 1518 1519 buf = transport_kmap_data_sg(cmd); 1520 if (!buf) { 1521 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1522 goto out; 1523 } 1524 1525 /* 1526 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1527 * first extract TransportID Parameter Data Length, and make sure 1528 * the value matches up to the SCSI expected data transfer length. 1529 */ 1530 tpdl = (buf[24] & 0xff) << 24; 1531 tpdl |= (buf[25] & 0xff) << 16; 1532 tpdl |= (buf[26] & 0xff) << 8; 1533 tpdl |= buf[27] & 0xff; 1534 1535 if ((tpdl + 28) != cmd->data_length) { 1536 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1537 " does not equal CDB data_length: %u\n", tpdl, 1538 cmd->data_length); 1539 ret = TCM_INVALID_PARAMETER_LIST; 1540 goto out_unmap; 1541 } 1542 /* 1543 * Start processing the received transport IDs using the 1544 * receiving I_T Nexus portal's fabric dependent methods to 1545 * obtain the SCSI Initiator Port/Device Identifiers. 1546 */ 1547 ptr = &buf[28]; 1548 1549 while (tpdl > 0) { 1550 struct se_lun *dest_lun, *tmp_lun; 1551 1552 proto_ident = (ptr[0] & 0x0f); 1553 dest_tpg = NULL; 1554 1555 spin_lock(&dev->se_port_lock); 1556 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1557 tmp_tpg = tmp_lun->lun_tpg; 1558 1559 /* 1560 * Look for the matching proto_ident provided by 1561 * the received TransportID 1562 */ 1563 if (tmp_tpg->proto_id != proto_ident) 1564 continue; 1565 dest_rtpi = tmp_lun->lun_rtpi; 1566 1567 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1568 (const char *)ptr, &tid_len, &iport_ptr); 1569 if (!i_str) 1570 continue; 1571 1572 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1573 spin_unlock(&dev->se_port_lock); 1574 1575 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1576 pr_err(" core_scsi3_tpg_depend_item()" 1577 " for tmp_tpg\n"); 1578 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1579 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1580 goto out_unmap; 1581 } 1582 /* 1583 * Locate the destination initiator ACL to be registered 1584 * from the decoded fabric module specific TransportID 1585 * at *i_str. 1586 */ 1587 mutex_lock(&tmp_tpg->acl_node_mutex); 1588 dest_node_acl = __core_tpg_get_initiator_node_acl( 1589 tmp_tpg, i_str); 1590 if (dest_node_acl) 1591 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1592 mutex_unlock(&tmp_tpg->acl_node_mutex); 1593 1594 if (!dest_node_acl) { 1595 core_scsi3_tpg_undepend_item(tmp_tpg); 1596 spin_lock(&dev->se_port_lock); 1597 continue; 1598 } 1599 1600 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1601 pr_err("configfs_depend_item() failed" 1602 " for dest_node_acl->acl_group\n"); 1603 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1604 core_scsi3_tpg_undepend_item(tmp_tpg); 1605 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1606 goto out_unmap; 1607 } 1608 1609 dest_tpg = tmp_tpg; 1610 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1611 " %s Port RTPI: %hu\n", 1612 dest_tpg->se_tpg_tfo->get_fabric_name(), 1613 dest_node_acl->initiatorname, dest_rtpi); 1614 1615 spin_lock(&dev->se_port_lock); 1616 break; 1617 } 1618 spin_unlock(&dev->se_port_lock); 1619 1620 if (!dest_tpg) { 1621 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1622 " dest_tpg\n"); 1623 ret = TCM_INVALID_PARAMETER_LIST; 1624 goto out_unmap; 1625 } 1626 1627 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1628 " tid_len: %d for %s + %s\n", 1629 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1630 tpdl, tid_len, i_str, iport_ptr); 1631 1632 if (tid_len > tpdl) { 1633 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1634 " %u for Transport ID: %s\n", tid_len, ptr); 1635 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1636 core_scsi3_tpg_undepend_item(dest_tpg); 1637 ret = TCM_INVALID_PARAMETER_LIST; 1638 goto out_unmap; 1639 } 1640 /* 1641 * Locate the desintation struct se_dev_entry pointer for matching 1642 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1643 * Target Port. 1644 */ 1645 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1646 dest_rtpi); 1647 if (!dest_se_deve) { 1648 pr_err("Unable to locate %s dest_se_deve" 1649 " from destination RTPI: %hu\n", 1650 dest_tpg->se_tpg_tfo->get_fabric_name(), 1651 dest_rtpi); 1652 1653 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1654 core_scsi3_tpg_undepend_item(dest_tpg); 1655 ret = TCM_INVALID_PARAMETER_LIST; 1656 goto out_unmap; 1657 } 1658 1659 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1660 pr_err("core_scsi3_lunacl_depend_item()" 1661 " failed\n"); 1662 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1663 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1664 core_scsi3_tpg_undepend_item(dest_tpg); 1665 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1666 goto out_unmap; 1667 } 1668 1669 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1670 " dest_se_deve mapped_lun: %u\n", 1671 dest_tpg->se_tpg_tfo->get_fabric_name(), 1672 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1673 1674 /* 1675 * Skip any TransportIDs that already have a registration for 1676 * this target port. 1677 */ 1678 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1679 iport_ptr); 1680 if (pr_reg_e) { 1681 core_scsi3_put_pr_reg(pr_reg_e); 1682 core_scsi3_lunacl_undepend_item(dest_se_deve); 1683 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1684 core_scsi3_tpg_undepend_item(dest_tpg); 1685 ptr += tid_len; 1686 tpdl -= tid_len; 1687 tid_len = 0; 1688 continue; 1689 } 1690 /* 1691 * Allocate a struct pr_transport_id_holder and setup 1692 * the dest_node_acl and dest_se_deve pointers for the 1693 * loop below. 1694 */ 1695 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1696 GFP_KERNEL); 1697 if (!tidh_new) { 1698 pr_err("Unable to allocate tidh_new\n"); 1699 core_scsi3_lunacl_undepend_item(dest_se_deve); 1700 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1701 core_scsi3_tpg_undepend_item(dest_tpg); 1702 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1703 goto out_unmap; 1704 } 1705 INIT_LIST_HEAD(&tidh_new->dest_list); 1706 tidh_new->dest_tpg = dest_tpg; 1707 tidh_new->dest_node_acl = dest_node_acl; 1708 tidh_new->dest_se_deve = dest_se_deve; 1709 1710 /* 1711 * Allocate, but do NOT add the registration for the 1712 * TransportID referenced SCSI Initiator port. This 1713 * done because of the following from spc4r17 in section 1714 * 6.14.3 wrt SPEC_I_PT: 1715 * 1716 * "If a registration fails for any initiator port (e.g., if th 1717 * logical unit does not have enough resources available to 1718 * hold the registration information), no registrations shall be 1719 * made, and the command shall be terminated with 1720 * CHECK CONDITION status." 1721 * 1722 * That means we call __core_scsi3_alloc_registration() here, 1723 * and then call __core_scsi3_add_registration() in the 1724 * 2nd loop which will never fail. 1725 */ 1726 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1727 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 1728 1729 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1730 dest_node_acl, dest_lun, dest_se_deve, 1731 dest_se_deve->mapped_lun, iport_ptr, 1732 sa_res_key, all_tg_pt, aptpl); 1733 if (!dest_pr_reg) { 1734 core_scsi3_lunacl_undepend_item(dest_se_deve); 1735 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1736 core_scsi3_tpg_undepend_item(dest_tpg); 1737 kfree(tidh_new); 1738 ret = TCM_INVALID_PARAMETER_LIST; 1739 goto out_unmap; 1740 } 1741 tidh_new->dest_pr_reg = dest_pr_reg; 1742 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1743 1744 ptr += tid_len; 1745 tpdl -= tid_len; 1746 tid_len = 0; 1747 1748 } 1749 1750 transport_kunmap_data_sg(cmd); 1751 1752 /* 1753 * Go ahead and create a registrations from tid_dest_list for the 1754 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1755 * and dest_se_deve. 1756 * 1757 * The SA Reservation Key from the PROUT is set for the 1758 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1759 * means that the TransportID Initiator port will be 1760 * registered on all of the target ports in the SCSI target device 1761 * ALL_TG_PT=0 means the registration will only be for the 1762 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1763 * was received. 1764 */ 1765 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1766 dest_tpg = tidh->dest_tpg; 1767 dest_node_acl = tidh->dest_node_acl; 1768 dest_se_deve = tidh->dest_se_deve; 1769 dest_pr_reg = tidh->dest_pr_reg; 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) ? 1784 dest_se_deve->mapped_lun : 0); 1785 1786 if (!dest_se_deve) 1787 continue; 1788 1789 core_scsi3_lunacl_undepend_item(dest_se_deve); 1790 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1791 core_scsi3_tpg_undepend_item(dest_tpg); 1792 } 1793 1794 return 0; 1795 out_unmap: 1796 transport_kunmap_data_sg(cmd); 1797 out: 1798 /* 1799 * For the failure case, release everything from tid_dest_list 1800 * including *dest_pr_reg and the configfs dependances.. 1801 */ 1802 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1803 dest_tpg = tidh->dest_tpg; 1804 dest_node_acl = tidh->dest_node_acl; 1805 dest_se_deve = tidh->dest_se_deve; 1806 dest_pr_reg = tidh->dest_pr_reg; 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_se_deve) 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_portal_group *tpg; 1840 struct t10_pr_registration *pr_reg; 1841 unsigned char tmp[512], isid_buf[32]; 1842 ssize_t len = 0; 1843 int reg_count = 0; 1844 int ret = 0; 1845 1846 spin_lock(&dev->dev_reservation_lock); 1847 spin_lock(&dev->t10_pr.registration_lock); 1848 /* 1849 * Walk the registration list.. 1850 */ 1851 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1852 pr_reg_list) { 1853 1854 tmp[0] = '\0'; 1855 isid_buf[0] = '\0'; 1856 tpg = pr_reg->pr_reg_nacl->se_tpg; 1857 /* 1858 * Write out any ISID value to APTPL metadata that was included 1859 * in the original registration. 1860 */ 1861 if (pr_reg->isid_present_at_reg) 1862 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1863 pr_reg->pr_reg_isid); 1864 /* 1865 * Include special metadata if the pr_reg matches the 1866 * reservation holder. 1867 */ 1868 if (dev->dev_pr_res_holder == pr_reg) { 1869 snprintf(tmp, 512, "PR_REG_START: %d" 1870 "\ninitiator_fabric=%s\n" 1871 "initiator_node=%s\n%s" 1872 "sa_res_key=%llu\n" 1873 "res_holder=1\nres_type=%02x\n" 1874 "res_scope=%02x\nres_all_tg_pt=%d\n" 1875 "mapped_lun=%u\n", reg_count, 1876 tpg->se_tpg_tfo->get_fabric_name(), 1877 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1878 pr_reg->pr_res_key, pr_reg->pr_res_type, 1879 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1880 pr_reg->pr_res_mapped_lun); 1881 } else { 1882 snprintf(tmp, 512, "PR_REG_START: %d\n" 1883 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1884 "sa_res_key=%llu\nres_holder=0\n" 1885 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1886 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1887 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1888 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1889 pr_reg->pr_res_mapped_lun); 1890 } 1891 1892 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1893 pr_err("Unable to update renaming APTPL metadata," 1894 " reallocating larger buffer\n"); 1895 ret = -EMSGSIZE; 1896 goto out; 1897 } 1898 len += sprintf(buf+len, "%s", tmp); 1899 1900 /* 1901 * Include information about the associated SCSI target port. 1902 */ 1903 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1904 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1905 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1906 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1907 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1908 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1909 reg_count); 1910 1911 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1912 pr_err("Unable to update renaming APTPL metadata," 1913 " reallocating larger buffer\n"); 1914 ret = -EMSGSIZE; 1915 goto out; 1916 } 1917 len += sprintf(buf+len, "%s", tmp); 1918 reg_count++; 1919 } 1920 1921 if (!reg_count) 1922 len += sprintf(buf+len, "No Registrations or Reservations"); 1923 1924 out: 1925 spin_unlock(&dev->t10_pr.registration_lock); 1926 spin_unlock(&dev->dev_reservation_lock); 1927 1928 return ret; 1929 } 1930 1931 static int __core_scsi3_write_aptpl_to_file( 1932 struct se_device *dev, 1933 unsigned char *buf) 1934 { 1935 struct t10_wwn *wwn = &dev->t10_wwn; 1936 struct file *file; 1937 int flags = O_RDWR | O_CREAT | O_TRUNC; 1938 char path[512]; 1939 u32 pr_aptpl_buf_len; 1940 int ret; 1941 1942 memset(path, 0, 512); 1943 1944 if (strlen(&wwn->unit_serial[0]) >= 512) { 1945 pr_err("WWN value for struct se_device does not fit" 1946 " into path buffer\n"); 1947 return -EMSGSIZE; 1948 } 1949 1950 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1951 file = filp_open(path, flags, 0600); 1952 if (IS_ERR(file)) { 1953 pr_err("filp_open(%s) for APTPL metadata" 1954 " failed\n", path); 1955 return PTR_ERR(file); 1956 } 1957 1958 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1959 1960 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1961 1962 if (ret < 0) 1963 pr_debug("Error writing APTPL metadata file: %s\n", path); 1964 fput(file); 1965 1966 return (ret < 0) ? -EIO : 0; 1967 } 1968 1969 /* 1970 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1971 * write out the updated metadata to struct file for this SCSI device. 1972 */ 1973 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1974 { 1975 unsigned char *buf; 1976 int rc, len = PR_APTPL_BUF_LEN; 1977 1978 if (!aptpl) { 1979 char *null_buf = "No Registrations or Reservations\n"; 1980 1981 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1982 dev->t10_pr.pr_aptpl_active = 0; 1983 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1984 1985 if (rc) 1986 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1987 1988 return 0; 1989 } 1990 retry: 1991 buf = vzalloc(len); 1992 if (!buf) 1993 return TCM_OUT_OF_RESOURCES; 1994 1995 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1996 if (rc < 0) { 1997 vfree(buf); 1998 len *= 2; 1999 goto retry; 2000 } 2001 2002 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2003 if (rc != 0) { 2004 pr_err("SPC-3 PR: Could not update APTPL\n"); 2005 vfree(buf); 2006 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2007 } 2008 dev->t10_pr.pr_aptpl_active = 1; 2009 vfree(buf); 2010 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2011 return 0; 2012 } 2013 2014 static sense_reason_t 2015 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2016 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2017 { 2018 struct se_session *se_sess = cmd->se_sess; 2019 struct se_device *dev = cmd->se_dev; 2020 struct se_lun *se_lun = cmd->se_lun; 2021 struct se_portal_group *se_tpg; 2022 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2023 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2024 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2025 sense_reason_t ret = TCM_NO_SENSE; 2026 int pr_holder = 0, type; 2027 2028 if (!se_sess || !se_lun) { 2029 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2030 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2031 } 2032 se_tpg = se_sess->se_tpg; 2033 2034 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2035 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2036 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2037 PR_REG_ISID_LEN); 2038 isid_ptr = &isid_buf[0]; 2039 } 2040 /* 2041 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2042 */ 2043 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2044 if (!pr_reg) { 2045 if (res_key) { 2046 pr_warn("SPC-3 PR: Reservation Key non-zero" 2047 " for SA REGISTER, returning CONFLICT\n"); 2048 return TCM_RESERVATION_CONFLICT; 2049 } 2050 /* 2051 * Do nothing but return GOOD status. 2052 */ 2053 if (!sa_res_key) 2054 return 0; 2055 2056 if (!spec_i_pt) { 2057 /* 2058 * Perform the Service Action REGISTER on the Initiator 2059 * Port Endpoint that the PRO was received from on the 2060 * Logical Unit of the SCSI device server. 2061 */ 2062 if (core_scsi3_alloc_registration(cmd->se_dev, 2063 se_sess->se_node_acl, cmd->se_lun, 2064 NULL, cmd->orig_fe_lun, isid_ptr, 2065 sa_res_key, all_tg_pt, aptpl, 2066 register_type, 0)) { 2067 pr_err("Unable to allocate" 2068 " struct t10_pr_registration\n"); 2069 return TCM_INVALID_PARAMETER_LIST; 2070 } 2071 } else { 2072 /* 2073 * Register both the Initiator port that received 2074 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2075 * TransportID from Parameter list and loop through 2076 * fabric dependent parameter list while calling 2077 * logic from of core_scsi3_alloc_registration() for 2078 * each TransportID provided SCSI Initiator Port/Device 2079 */ 2080 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2081 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2082 if (ret != 0) 2083 return ret; 2084 } 2085 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2086 } 2087 2088 /* ok, existing registration */ 2089 2090 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2091 pr_err("SPC-3 PR REGISTER: Received" 2092 " res_key: 0x%016Lx does not match" 2093 " existing SA REGISTER res_key:" 2094 " 0x%016Lx\n", res_key, 2095 pr_reg->pr_res_key); 2096 ret = TCM_RESERVATION_CONFLICT; 2097 goto out; 2098 } 2099 2100 if (spec_i_pt) { 2101 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2102 " set on a registered nexus\n"); 2103 ret = TCM_INVALID_PARAMETER_LIST; 2104 goto out; 2105 } 2106 2107 /* 2108 * An existing ALL_TG_PT=1 registration being released 2109 * must also set ALL_TG_PT=1 in the incoming PROUT. 2110 */ 2111 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2112 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2113 " registration exists, but ALL_TG_PT=1 bit not" 2114 " present in received PROUT\n"); 2115 ret = TCM_INVALID_CDB_FIELD; 2116 goto out; 2117 } 2118 2119 /* 2120 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2121 */ 2122 if (sa_res_key) { 2123 /* 2124 * Increment PRgeneration counter for struct se_device" 2125 * upon a successful REGISTER, see spc4r17 section 6.3.2 2126 * READ_KEYS service action. 2127 */ 2128 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2129 pr_reg->pr_res_key = sa_res_key; 2130 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2131 " Key for %s to: 0x%016Lx PRgeneration:" 2132 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2133 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2134 pr_reg->pr_reg_nacl->initiatorname, 2135 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2136 2137 } else { 2138 /* 2139 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2140 */ 2141 type = pr_reg->pr_res_type; 2142 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2143 pr_reg); 2144 if (pr_holder < 0) { 2145 ret = TCM_RESERVATION_CONFLICT; 2146 goto out; 2147 } 2148 2149 spin_lock(&pr_tmpl->registration_lock); 2150 /* 2151 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2152 * and matching pr_res_key. 2153 */ 2154 if (pr_reg->pr_reg_all_tg_pt) { 2155 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2156 &pr_tmpl->registration_list, 2157 pr_reg_list) { 2158 2159 if (!pr_reg_p->pr_reg_all_tg_pt) 2160 continue; 2161 if (pr_reg_p->pr_res_key != res_key) 2162 continue; 2163 if (pr_reg == pr_reg_p) 2164 continue; 2165 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2166 pr_reg_p->pr_reg_nacl->initiatorname)) 2167 continue; 2168 2169 __core_scsi3_free_registration(dev, 2170 pr_reg_p, NULL, 0); 2171 } 2172 } 2173 2174 /* 2175 * Release the calling I_T Nexus registration now.. 2176 */ 2177 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2178 pr_reg = NULL; 2179 2180 /* 2181 * From spc4r17, section 5.7.11.3 Unregistering 2182 * 2183 * If the persistent reservation is a registrants only 2184 * type, the device server shall establish a unit 2185 * attention condition for the initiator port associated 2186 * with every registered I_T nexus except for the I_T 2187 * nexus on which the PERSISTENT RESERVE OUT command was 2188 * received, with the additional sense code set to 2189 * RESERVATIONS RELEASED. 2190 */ 2191 if (pr_holder && 2192 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2193 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2194 list_for_each_entry(pr_reg_p, 2195 &pr_tmpl->registration_list, 2196 pr_reg_list) { 2197 2198 core_scsi3_ua_allocate( 2199 pr_reg_p->pr_reg_nacl, 2200 pr_reg_p->pr_res_mapped_lun, 2201 0x2A, 2202 ASCQ_2AH_RESERVATIONS_RELEASED); 2203 } 2204 } 2205 2206 spin_unlock(&pr_tmpl->registration_lock); 2207 } 2208 2209 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2210 2211 out: 2212 if (pr_reg) 2213 core_scsi3_put_pr_reg(pr_reg); 2214 return ret; 2215 } 2216 2217 unsigned char *core_scsi3_pr_dump_type(int type) 2218 { 2219 switch (type) { 2220 case PR_TYPE_WRITE_EXCLUSIVE: 2221 return "Write Exclusive Access"; 2222 case PR_TYPE_EXCLUSIVE_ACCESS: 2223 return "Exclusive Access"; 2224 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2225 return "Write Exclusive Access, Registrants Only"; 2226 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2227 return "Exclusive Access, Registrants Only"; 2228 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2229 return "Write Exclusive Access, All Registrants"; 2230 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2231 return "Exclusive Access, All Registrants"; 2232 default: 2233 break; 2234 } 2235 2236 return "Unknown SPC-3 PR Type"; 2237 } 2238 2239 static sense_reason_t 2240 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2241 { 2242 struct se_device *dev = cmd->se_dev; 2243 struct se_session *se_sess = cmd->se_sess; 2244 struct se_lun *se_lun = cmd->se_lun; 2245 struct t10_pr_registration *pr_reg, *pr_res_holder; 2246 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2247 char i_buf[PR_REG_ISID_ID_LEN]; 2248 sense_reason_t ret; 2249 2250 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2251 2252 if (!se_sess || !se_lun) { 2253 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2254 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2255 } 2256 /* 2257 * Locate the existing *pr_reg via struct se_node_acl pointers 2258 */ 2259 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2260 se_sess); 2261 if (!pr_reg) { 2262 pr_err("SPC-3 PR: Unable to locate" 2263 " PR_REGISTERED *pr_reg for RESERVE\n"); 2264 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2265 } 2266 /* 2267 * From spc4r17 Section 5.7.9: Reserving: 2268 * 2269 * An application client creates a persistent reservation by issuing 2270 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2271 * a registered I_T nexus with the following parameters: 2272 * a) RESERVATION KEY set to the value of the reservation key that is 2273 * registered with the logical unit for the I_T nexus; and 2274 */ 2275 if (res_key != pr_reg->pr_res_key) { 2276 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2277 " does not match existing SA REGISTER res_key:" 2278 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2279 ret = TCM_RESERVATION_CONFLICT; 2280 goto out_put_pr_reg; 2281 } 2282 /* 2283 * From spc4r17 Section 5.7.9: Reserving: 2284 * 2285 * From above: 2286 * b) TYPE field and SCOPE field set to the persistent reservation 2287 * being created. 2288 * 2289 * Only one persistent reservation is allowed at a time per logical unit 2290 * and that persistent reservation has a scope of LU_SCOPE. 2291 */ 2292 if (scope != PR_SCOPE_LU_SCOPE) { 2293 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2294 ret = TCM_INVALID_PARAMETER_LIST; 2295 goto out_put_pr_reg; 2296 } 2297 /* 2298 * See if we have an existing PR reservation holder pointer at 2299 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2300 * *pr_res_holder. 2301 */ 2302 spin_lock(&dev->dev_reservation_lock); 2303 pr_res_holder = dev->dev_pr_res_holder; 2304 if (pr_res_holder) { 2305 /* 2306 * From spc4r17 Section 5.7.9: Reserving: 2307 * 2308 * If the device server receives a PERSISTENT RESERVE OUT 2309 * command from an I_T nexus other than a persistent reservation 2310 * holder (see 5.7.10) that attempts to create a persistent 2311 * reservation when a persistent reservation already exists for 2312 * the logical unit, then the command shall be completed with 2313 * RESERVATION CONFLICT status. 2314 */ 2315 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2316 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2317 pr_err("SPC-3 PR: Attempted RESERVE from" 2318 " [%s]: %s while reservation already held by" 2319 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2320 cmd->se_tfo->get_fabric_name(), 2321 se_sess->se_node_acl->initiatorname, 2322 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2323 pr_res_holder->pr_reg_nacl->initiatorname); 2324 2325 spin_unlock(&dev->dev_reservation_lock); 2326 ret = TCM_RESERVATION_CONFLICT; 2327 goto out_put_pr_reg; 2328 } 2329 /* 2330 * From spc4r17 Section 5.7.9: Reserving: 2331 * 2332 * If a persistent reservation holder attempts to modify the 2333 * type or scope of an existing persistent reservation, the 2334 * command shall be completed with RESERVATION CONFLICT status. 2335 */ 2336 if ((pr_res_holder->pr_res_type != type) || 2337 (pr_res_holder->pr_res_scope != scope)) { 2338 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2339 pr_err("SPC-3 PR: Attempted RESERVE from" 2340 " [%s]: %s trying to change TYPE and/or SCOPE," 2341 " while reservation already held by [%s]: %s," 2342 " returning RESERVATION_CONFLICT\n", 2343 cmd->se_tfo->get_fabric_name(), 2344 se_sess->se_node_acl->initiatorname, 2345 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2346 pr_res_holder->pr_reg_nacl->initiatorname); 2347 2348 spin_unlock(&dev->dev_reservation_lock); 2349 ret = TCM_RESERVATION_CONFLICT; 2350 goto out_put_pr_reg; 2351 } 2352 /* 2353 * From spc4r17 Section 5.7.9: Reserving: 2354 * 2355 * If the device server receives a PERSISTENT RESERVE OUT 2356 * command with RESERVE service action where the TYPE field and 2357 * the SCOPE field contain the same values as the existing type 2358 * and scope from a persistent reservation holder, it shall not 2359 * make any change to the existing persistent reservation and 2360 * shall completethe command with GOOD status. 2361 */ 2362 spin_unlock(&dev->dev_reservation_lock); 2363 ret = 0; 2364 goto out_put_pr_reg; 2365 } 2366 /* 2367 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2368 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2369 */ 2370 pr_reg->pr_res_scope = scope; 2371 pr_reg->pr_res_type = type; 2372 pr_reg->pr_res_holder = 1; 2373 dev->dev_pr_res_holder = pr_reg; 2374 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2375 2376 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2377 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2378 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2379 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2380 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2381 cmd->se_tfo->get_fabric_name(), 2382 se_sess->se_node_acl->initiatorname, 2383 i_buf); 2384 spin_unlock(&dev->dev_reservation_lock); 2385 2386 if (pr_tmpl->pr_aptpl_active) 2387 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2388 2389 ret = 0; 2390 out_put_pr_reg: 2391 core_scsi3_put_pr_reg(pr_reg); 2392 return ret; 2393 } 2394 2395 static sense_reason_t 2396 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2397 u64 res_key) 2398 { 2399 switch (type) { 2400 case PR_TYPE_WRITE_EXCLUSIVE: 2401 case PR_TYPE_EXCLUSIVE_ACCESS: 2402 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2403 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2404 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2405 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2406 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2407 default: 2408 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2409 " 0x%02x\n", type); 2410 return TCM_INVALID_CDB_FIELD; 2411 } 2412 } 2413 2414 /* 2415 * Called with struct se_device->dev_reservation_lock held. 2416 */ 2417 static void __core_scsi3_complete_pro_release( 2418 struct se_device *dev, 2419 struct se_node_acl *se_nacl, 2420 struct t10_pr_registration *pr_reg, 2421 int explicit, 2422 int unreg) 2423 { 2424 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2425 char i_buf[PR_REG_ISID_ID_LEN]; 2426 int pr_res_type = 0, pr_res_scope = 0; 2427 2428 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2429 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2430 /* 2431 * Go ahead and release the current PR reservation holder. 2432 * If an All Registrants reservation is currently active and 2433 * a unregister operation is requested, replace the current 2434 * dev_pr_res_holder with another active registration. 2435 */ 2436 if (dev->dev_pr_res_holder) { 2437 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2438 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2439 dev->dev_pr_res_holder->pr_res_type = 0; 2440 dev->dev_pr_res_holder->pr_res_scope = 0; 2441 dev->dev_pr_res_holder->pr_res_holder = 0; 2442 dev->dev_pr_res_holder = NULL; 2443 } 2444 if (!unreg) 2445 goto out; 2446 2447 spin_lock(&dev->t10_pr.registration_lock); 2448 list_del_init(&pr_reg->pr_reg_list); 2449 /* 2450 * If the I_T nexus is a reservation holder, the persistent reservation 2451 * is of an all registrants type, and the I_T nexus is the last remaining 2452 * registered I_T nexus, then the device server shall also release the 2453 * persistent reservation. 2454 */ 2455 if (!list_empty(&dev->t10_pr.registration_list) && 2456 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2457 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2458 dev->dev_pr_res_holder = 2459 list_entry(dev->t10_pr.registration_list.next, 2460 struct t10_pr_registration, pr_reg_list); 2461 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2462 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2463 dev->dev_pr_res_holder->pr_res_holder = 1; 2464 } 2465 spin_unlock(&dev->t10_pr.registration_lock); 2466 out: 2467 if (!dev->dev_pr_res_holder) { 2468 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2469 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2470 tfo->get_fabric_name(), (explicit) ? "explicit" : 2471 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2472 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2473 } 2474 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2475 tfo->get_fabric_name(), se_nacl->initiatorname, 2476 i_buf); 2477 /* 2478 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2479 */ 2480 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2481 } 2482 2483 static sense_reason_t 2484 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2485 u64 res_key) 2486 { 2487 struct se_device *dev = cmd->se_dev; 2488 struct se_session *se_sess = cmd->se_sess; 2489 struct se_lun *se_lun = cmd->se_lun; 2490 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2491 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2492 sense_reason_t ret = 0; 2493 2494 if (!se_sess || !se_lun) { 2495 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2496 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2497 } 2498 /* 2499 * Locate the existing *pr_reg via struct se_node_acl pointers 2500 */ 2501 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2502 if (!pr_reg) { 2503 pr_err("SPC-3 PR: Unable to locate" 2504 " PR_REGISTERED *pr_reg for RELEASE\n"); 2505 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2506 } 2507 /* 2508 * From spc4r17 Section 5.7.11.2 Releasing: 2509 * 2510 * If there is no persistent reservation or in response to a persistent 2511 * reservation release request from a registered I_T nexus that is not a 2512 * persistent reservation holder (see 5.7.10), the device server shall 2513 * do the following: 2514 * 2515 * a) Not release the persistent reservation, if any; 2516 * b) Not remove any registrations; and 2517 * c) Complete the command with GOOD status. 2518 */ 2519 spin_lock(&dev->dev_reservation_lock); 2520 pr_res_holder = dev->dev_pr_res_holder; 2521 if (!pr_res_holder) { 2522 /* 2523 * No persistent reservation, return GOOD status. 2524 */ 2525 spin_unlock(&dev->dev_reservation_lock); 2526 goto out_put_pr_reg; 2527 } 2528 2529 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2530 /* 2531 * Release request from a registered I_T nexus that is not a 2532 * persistent reservation holder. return GOOD status. 2533 */ 2534 spin_unlock(&dev->dev_reservation_lock); 2535 goto out_put_pr_reg; 2536 } 2537 2538 /* 2539 * From spc4r17 Section 5.7.11.2 Releasing: 2540 * 2541 * Only the persistent reservation holder (see 5.7.10) is allowed to 2542 * release a persistent reservation. 2543 * 2544 * An application client releases the persistent reservation by issuing 2545 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2546 * an I_T nexus that is a persistent reservation holder with the 2547 * following parameters: 2548 * 2549 * a) RESERVATION KEY field set to the value of the reservation key 2550 * that is registered with the logical unit for the I_T nexus; 2551 */ 2552 if (res_key != pr_reg->pr_res_key) { 2553 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2554 " does not match existing SA REGISTER res_key:" 2555 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2556 spin_unlock(&dev->dev_reservation_lock); 2557 ret = TCM_RESERVATION_CONFLICT; 2558 goto out_put_pr_reg; 2559 } 2560 /* 2561 * From spc4r17 Section 5.7.11.2 Releasing and above: 2562 * 2563 * b) TYPE field and SCOPE field set to match the persistent 2564 * reservation being released. 2565 */ 2566 if ((pr_res_holder->pr_res_type != type) || 2567 (pr_res_holder->pr_res_scope != scope)) { 2568 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2569 pr_err("SPC-3 PR RELEASE: Attempted to release" 2570 " reservation from [%s]: %s with different TYPE " 2571 "and/or SCOPE while reservation already held by" 2572 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2573 cmd->se_tfo->get_fabric_name(), 2574 se_sess->se_node_acl->initiatorname, 2575 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2576 pr_res_holder->pr_reg_nacl->initiatorname); 2577 2578 spin_unlock(&dev->dev_reservation_lock); 2579 ret = TCM_RESERVATION_CONFLICT; 2580 goto out_put_pr_reg; 2581 } 2582 /* 2583 * In response to a persistent reservation release request from the 2584 * persistent reservation holder the device server shall perform a 2585 * release by doing the following as an uninterrupted series of actions: 2586 * a) Release the persistent reservation; 2587 * b) Not remove any registration(s); 2588 * c) If the released persistent reservation is a registrants only type 2589 * or all registrants type persistent reservation, 2590 * the device server shall establish a unit attention condition for 2591 * the initiator port associated with every regis- 2592 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2593 * RESERVE OUT command with RELEASE service action was received, 2594 * with the additional sense code set to RESERVATIONS RELEASED; and 2595 * d) If the persistent reservation is of any other type, the device 2596 * server shall not establish a unit attention condition. 2597 */ 2598 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2599 pr_reg, 1, 0); 2600 2601 spin_unlock(&dev->dev_reservation_lock); 2602 2603 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2604 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2605 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2606 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2607 /* 2608 * If no UNIT ATTENTION conditions will be established for 2609 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2610 * go ahead and check for APTPL=1 update+write below 2611 */ 2612 goto write_aptpl; 2613 } 2614 2615 spin_lock(&pr_tmpl->registration_lock); 2616 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2617 pr_reg_list) { 2618 /* 2619 * Do not establish a UNIT ATTENTION condition 2620 * for the calling I_T Nexus 2621 */ 2622 if (pr_reg_p == pr_reg) 2623 continue; 2624 2625 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2626 pr_reg_p->pr_res_mapped_lun, 2627 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2628 } 2629 spin_unlock(&pr_tmpl->registration_lock); 2630 2631 write_aptpl: 2632 if (pr_tmpl->pr_aptpl_active) 2633 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2634 2635 out_put_pr_reg: 2636 core_scsi3_put_pr_reg(pr_reg); 2637 return ret; 2638 } 2639 2640 static sense_reason_t 2641 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2642 { 2643 struct se_device *dev = cmd->se_dev; 2644 struct se_node_acl *pr_reg_nacl; 2645 struct se_session *se_sess = cmd->se_sess; 2646 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2647 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2648 u32 pr_res_mapped_lun = 0; 2649 int calling_it_nexus = 0; 2650 /* 2651 * Locate the existing *pr_reg via struct se_node_acl pointers 2652 */ 2653 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2654 se_sess->se_node_acl, se_sess); 2655 if (!pr_reg_n) { 2656 pr_err("SPC-3 PR: Unable to locate" 2657 " PR_REGISTERED *pr_reg for CLEAR\n"); 2658 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2659 } 2660 /* 2661 * From spc4r17 section 5.7.11.6, Clearing: 2662 * 2663 * Any application client may release the persistent reservation and 2664 * remove all registrations from a device server by issuing a 2665 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2666 * registered I_T nexus with the following parameter: 2667 * 2668 * a) RESERVATION KEY field set to the value of the reservation key 2669 * that is registered with the logical unit for the I_T nexus. 2670 */ 2671 if (res_key != pr_reg_n->pr_res_key) { 2672 pr_err("SPC-3 PR REGISTER: Received" 2673 " res_key: 0x%016Lx does not match" 2674 " existing SA REGISTER res_key:" 2675 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2676 core_scsi3_put_pr_reg(pr_reg_n); 2677 return TCM_RESERVATION_CONFLICT; 2678 } 2679 /* 2680 * a) Release the persistent reservation, if any; 2681 */ 2682 spin_lock(&dev->dev_reservation_lock); 2683 pr_res_holder = dev->dev_pr_res_holder; 2684 if (pr_res_holder) { 2685 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2686 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2687 pr_res_holder, 0, 0); 2688 } 2689 spin_unlock(&dev->dev_reservation_lock); 2690 /* 2691 * b) Remove all registration(s) (see spc4r17 5.7.7); 2692 */ 2693 spin_lock(&pr_tmpl->registration_lock); 2694 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2695 &pr_tmpl->registration_list, pr_reg_list) { 2696 2697 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2698 pr_reg_nacl = pr_reg->pr_reg_nacl; 2699 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2700 __core_scsi3_free_registration(dev, pr_reg, NULL, 2701 calling_it_nexus); 2702 /* 2703 * e) Establish a unit attention condition for the initiator 2704 * port associated with every registered I_T nexus other 2705 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2706 * command with CLEAR service action was received, with the 2707 * additional sense code set to RESERVATIONS PREEMPTED. 2708 */ 2709 if (!calling_it_nexus) 2710 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2711 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2712 } 2713 spin_unlock(&pr_tmpl->registration_lock); 2714 2715 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2716 cmd->se_tfo->get_fabric_name()); 2717 2718 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2719 2720 core_scsi3_pr_generation(dev); 2721 return 0; 2722 } 2723 2724 /* 2725 * Called with struct se_device->dev_reservation_lock held. 2726 */ 2727 static void __core_scsi3_complete_pro_preempt( 2728 struct se_device *dev, 2729 struct t10_pr_registration *pr_reg, 2730 struct list_head *preempt_and_abort_list, 2731 int type, 2732 int scope, 2733 enum preempt_type preempt_type) 2734 { 2735 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2736 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2737 char i_buf[PR_REG_ISID_ID_LEN]; 2738 2739 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2740 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2741 /* 2742 * Do an implicit RELEASE of the existing reservation. 2743 */ 2744 if (dev->dev_pr_res_holder) 2745 __core_scsi3_complete_pro_release(dev, nacl, 2746 dev->dev_pr_res_holder, 0, 0); 2747 2748 dev->dev_pr_res_holder = pr_reg; 2749 pr_reg->pr_res_holder = 1; 2750 pr_reg->pr_res_type = type; 2751 pr_reg->pr_res_scope = scope; 2752 2753 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2754 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2755 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2756 core_scsi3_pr_dump_type(type), 2757 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2758 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2759 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2760 nacl->initiatorname, i_buf); 2761 /* 2762 * For PREEMPT_AND_ABORT, add the preempting reservation's 2763 * struct t10_pr_registration to the list that will be compared 2764 * against received CDBs.. 2765 */ 2766 if (preempt_and_abort_list) 2767 list_add_tail(&pr_reg->pr_reg_abort_list, 2768 preempt_and_abort_list); 2769 } 2770 2771 static void core_scsi3_release_preempt_and_abort( 2772 struct list_head *preempt_and_abort_list, 2773 struct t10_pr_registration *pr_reg_holder) 2774 { 2775 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2776 2777 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2778 pr_reg_abort_list) { 2779 2780 list_del(&pr_reg->pr_reg_abort_list); 2781 if (pr_reg_holder == pr_reg) 2782 continue; 2783 if (pr_reg->pr_res_holder) { 2784 pr_warn("pr_reg->pr_res_holder still set\n"); 2785 continue; 2786 } 2787 2788 pr_reg->pr_reg_deve = NULL; 2789 pr_reg->pr_reg_nacl = NULL; 2790 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2791 } 2792 } 2793 2794 static sense_reason_t 2795 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2796 u64 sa_res_key, enum preempt_type preempt_type) 2797 { 2798 struct se_device *dev = cmd->se_dev; 2799 struct se_node_acl *pr_reg_nacl; 2800 struct se_session *se_sess = cmd->se_sess; 2801 LIST_HEAD(preempt_and_abort_list); 2802 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2803 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2804 u32 pr_res_mapped_lun = 0; 2805 int all_reg = 0, calling_it_nexus = 0; 2806 bool sa_res_key_unmatched = sa_res_key != 0; 2807 int prh_type = 0, prh_scope = 0; 2808 2809 if (!se_sess) 2810 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2811 2812 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2813 se_sess); 2814 if (!pr_reg_n) { 2815 pr_err("SPC-3 PR: Unable to locate" 2816 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2817 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2818 return TCM_RESERVATION_CONFLICT; 2819 } 2820 if (pr_reg_n->pr_res_key != res_key) { 2821 core_scsi3_put_pr_reg(pr_reg_n); 2822 return TCM_RESERVATION_CONFLICT; 2823 } 2824 if (scope != PR_SCOPE_LU_SCOPE) { 2825 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2826 core_scsi3_put_pr_reg(pr_reg_n); 2827 return TCM_INVALID_PARAMETER_LIST; 2828 } 2829 2830 spin_lock(&dev->dev_reservation_lock); 2831 pr_res_holder = dev->dev_pr_res_holder; 2832 if (pr_res_holder && 2833 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2834 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2835 all_reg = 1; 2836 2837 if (!all_reg && !sa_res_key) { 2838 spin_unlock(&dev->dev_reservation_lock); 2839 core_scsi3_put_pr_reg(pr_reg_n); 2840 return TCM_INVALID_PARAMETER_LIST; 2841 } 2842 /* 2843 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2844 * 2845 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2846 * persistent reservation holder or there is no persistent reservation 2847 * holder (i.e., there is no persistent reservation), then the device 2848 * server shall perform a preempt by doing the following in an 2849 * uninterrupted series of actions. (See below..) 2850 */ 2851 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2852 /* 2853 * No existing or SA Reservation Key matching reservations.. 2854 * 2855 * PROUT SA PREEMPT with All Registrant type reservations are 2856 * allowed to be processed without a matching SA Reservation Key 2857 */ 2858 spin_lock(&pr_tmpl->registration_lock); 2859 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2860 &pr_tmpl->registration_list, pr_reg_list) { 2861 /* 2862 * Removing of registrations in non all registrants 2863 * type reservations without a matching SA reservation 2864 * key. 2865 * 2866 * a) Remove the registrations for all I_T nexuses 2867 * specified by the SERVICE ACTION RESERVATION KEY 2868 * field; 2869 * b) Ignore the contents of the SCOPE and TYPE fields; 2870 * c) Process tasks as defined in 5.7.1; and 2871 * d) Establish a unit attention condition for the 2872 * initiator port associated with every I_T nexus 2873 * that lost its registration other than the I_T 2874 * nexus on which the PERSISTENT RESERVE OUT command 2875 * was received, with the additional sense code set 2876 * to REGISTRATIONS PREEMPTED. 2877 */ 2878 if (!all_reg) { 2879 if (pr_reg->pr_res_key != sa_res_key) 2880 continue; 2881 sa_res_key_unmatched = false; 2882 2883 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2884 pr_reg_nacl = pr_reg->pr_reg_nacl; 2885 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2886 __core_scsi3_free_registration(dev, pr_reg, 2887 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2888 NULL, calling_it_nexus); 2889 } else { 2890 /* 2891 * Case for any existing all registrants type 2892 * reservation, follow logic in spc4r17 section 2893 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2894 * 2895 * For a ZERO SA Reservation key, release 2896 * all other registrations and do an implicit 2897 * release of active persistent reservation. 2898 * 2899 * For a non-ZERO SA Reservation key, only 2900 * release the matching reservation key from 2901 * registrations. 2902 */ 2903 if ((sa_res_key) && 2904 (pr_reg->pr_res_key != sa_res_key)) 2905 continue; 2906 sa_res_key_unmatched = false; 2907 2908 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2909 if (calling_it_nexus) 2910 continue; 2911 2912 pr_reg_nacl = pr_reg->pr_reg_nacl; 2913 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2914 __core_scsi3_free_registration(dev, pr_reg, 2915 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2916 NULL, 0); 2917 } 2918 if (!calling_it_nexus) 2919 core_scsi3_ua_allocate(pr_reg_nacl, 2920 pr_res_mapped_lun, 0x2A, 2921 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2922 } 2923 spin_unlock(&pr_tmpl->registration_lock); 2924 /* 2925 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2926 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2927 * RESERVATION KEY field to a value that does not match any 2928 * registered reservation key, then the device server shall 2929 * complete the command with RESERVATION CONFLICT status. 2930 */ 2931 if (sa_res_key_unmatched) { 2932 spin_unlock(&dev->dev_reservation_lock); 2933 core_scsi3_put_pr_reg(pr_reg_n); 2934 return TCM_RESERVATION_CONFLICT; 2935 } 2936 /* 2937 * For an existing all registrants type reservation 2938 * with a zero SA rservation key, preempt the existing 2939 * reservation with the new PR type and scope. 2940 */ 2941 if (pr_res_holder && all_reg && !(sa_res_key)) { 2942 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2943 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2944 type, scope, preempt_type); 2945 2946 if (preempt_type == PREEMPT_AND_ABORT) 2947 core_scsi3_release_preempt_and_abort( 2948 &preempt_and_abort_list, pr_reg_n); 2949 } 2950 spin_unlock(&dev->dev_reservation_lock); 2951 2952 if (pr_tmpl->pr_aptpl_active) 2953 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2954 2955 core_scsi3_put_pr_reg(pr_reg_n); 2956 core_scsi3_pr_generation(cmd->se_dev); 2957 return 0; 2958 } 2959 /* 2960 * The PREEMPTing SA reservation key matches that of the 2961 * existing persistent reservation, first, we check if 2962 * we are preempting our own reservation. 2963 * From spc4r17, section 5.7.11.4.3 Preempting 2964 * persistent reservations and registration handling 2965 * 2966 * If an all registrants persistent reservation is not 2967 * present, it is not an error for the persistent 2968 * reservation holder to preempt itself (i.e., a 2969 * PERSISTENT RESERVE OUT with a PREEMPT service action 2970 * or a PREEMPT AND ABORT service action with the 2971 * SERVICE ACTION RESERVATION KEY value equal to the 2972 * persistent reservation holder's reservation key that 2973 * is received from the persistent reservation holder). 2974 * In that case, the device server shall establish the 2975 * new persistent reservation and maintain the 2976 * registration. 2977 */ 2978 prh_type = pr_res_holder->pr_res_type; 2979 prh_scope = pr_res_holder->pr_res_scope; 2980 /* 2981 * If the SERVICE ACTION RESERVATION KEY field identifies a 2982 * persistent reservation holder (see 5.7.10), the device 2983 * server shall perform a preempt by doing the following as 2984 * an uninterrupted series of actions: 2985 * 2986 * a) Release the persistent reservation for the holder 2987 * identified by the SERVICE ACTION RESERVATION KEY field; 2988 */ 2989 if (pr_reg_n != pr_res_holder) 2990 __core_scsi3_complete_pro_release(dev, 2991 pr_res_holder->pr_reg_nacl, 2992 dev->dev_pr_res_holder, 0, 0); 2993 /* 2994 * b) Remove the registrations for all I_T nexuses identified 2995 * by the SERVICE ACTION RESERVATION KEY field, except the 2996 * I_T nexus that is being used for the PERSISTENT RESERVE 2997 * OUT command. If an all registrants persistent reservation 2998 * is present and the SERVICE ACTION RESERVATION KEY field 2999 * is set to zero, then all registrations shall be removed 3000 * except for that of the I_T nexus that is being used for 3001 * the PERSISTENT RESERVE OUT command; 3002 */ 3003 spin_lock(&pr_tmpl->registration_lock); 3004 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3005 &pr_tmpl->registration_list, pr_reg_list) { 3006 3007 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3008 if (calling_it_nexus) 3009 continue; 3010 3011 if (pr_reg->pr_res_key != sa_res_key) 3012 continue; 3013 3014 pr_reg_nacl = pr_reg->pr_reg_nacl; 3015 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3016 __core_scsi3_free_registration(dev, pr_reg, 3017 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3018 calling_it_nexus); 3019 /* 3020 * e) Establish a unit attention condition for the initiator 3021 * port associated with every I_T nexus that lost its 3022 * persistent reservation and/or registration, with the 3023 * additional sense code set to REGISTRATIONS PREEMPTED; 3024 */ 3025 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3026 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3027 } 3028 spin_unlock(&pr_tmpl->registration_lock); 3029 /* 3030 * c) Establish a persistent reservation for the preempting 3031 * I_T nexus using the contents of the SCOPE and TYPE fields; 3032 */ 3033 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3034 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3035 type, scope, preempt_type); 3036 /* 3037 * d) Process tasks as defined in 5.7.1; 3038 * e) See above.. 3039 * f) If the type or scope has changed, then for every I_T nexus 3040 * whose reservation key was not removed, except for the I_T 3041 * nexus on which the PERSISTENT RESERVE OUT command was 3042 * received, the device server shall establish a unit 3043 * attention condition for the initiator port associated with 3044 * that I_T nexus, with the additional sense code set to 3045 * RESERVATIONS RELEASED. If the type or scope have not 3046 * changed, then no unit attention condition(s) shall be 3047 * established for this reason. 3048 */ 3049 if ((prh_type != type) || (prh_scope != scope)) { 3050 spin_lock(&pr_tmpl->registration_lock); 3051 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3052 &pr_tmpl->registration_list, pr_reg_list) { 3053 3054 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3055 if (calling_it_nexus) 3056 continue; 3057 3058 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3059 pr_reg->pr_res_mapped_lun, 0x2A, 3060 ASCQ_2AH_RESERVATIONS_RELEASED); 3061 } 3062 spin_unlock(&pr_tmpl->registration_lock); 3063 } 3064 spin_unlock(&dev->dev_reservation_lock); 3065 /* 3066 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3067 * All received CDBs for the matching existing reservation and 3068 * registrations undergo ABORT_TASK logic. 3069 * 3070 * From there, core_scsi3_release_preempt_and_abort() will 3071 * release every registration in the list (which have already 3072 * been removed from the primary pr_reg list), except the 3073 * new persistent reservation holder, the calling Initiator Port. 3074 */ 3075 if (preempt_type == PREEMPT_AND_ABORT) { 3076 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3077 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3078 pr_reg_n); 3079 } 3080 3081 if (pr_tmpl->pr_aptpl_active) 3082 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3083 3084 core_scsi3_put_pr_reg(pr_reg_n); 3085 core_scsi3_pr_generation(cmd->se_dev); 3086 return 0; 3087 } 3088 3089 static sense_reason_t 3090 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3091 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3092 { 3093 switch (type) { 3094 case PR_TYPE_WRITE_EXCLUSIVE: 3095 case PR_TYPE_EXCLUSIVE_ACCESS: 3096 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3097 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3098 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3099 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3100 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3101 sa_res_key, preempt_type); 3102 default: 3103 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3104 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3105 return TCM_INVALID_CDB_FIELD; 3106 } 3107 } 3108 3109 3110 static sense_reason_t 3111 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3112 u64 sa_res_key, int aptpl, int unreg) 3113 { 3114 struct se_session *se_sess = cmd->se_sess; 3115 struct se_device *dev = cmd->se_dev; 3116 struct se_dev_entry *dest_se_deve = NULL; 3117 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3118 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3119 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3120 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3121 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3122 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3123 unsigned char *buf; 3124 const unsigned char *initiator_str; 3125 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3126 u32 tid_len, tmp_tid_len; 3127 int new_reg = 0, type, scope, matching_iname; 3128 sense_reason_t ret; 3129 unsigned short rtpi; 3130 unsigned char proto_ident; 3131 3132 if (!se_sess || !se_lun) { 3133 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3134 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3135 } 3136 3137 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3138 se_tpg = se_sess->se_tpg; 3139 tf_ops = se_tpg->se_tpg_tfo; 3140 /* 3141 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3142 * Register behaviors for a REGISTER AND MOVE service action 3143 * 3144 * Locate the existing *pr_reg via struct se_node_acl pointers 3145 */ 3146 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3147 se_sess); 3148 if (!pr_reg) { 3149 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3150 " *pr_reg for REGISTER_AND_MOVE\n"); 3151 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3152 } 3153 /* 3154 * The provided reservation key much match the existing reservation key 3155 * provided during this initiator's I_T nexus registration. 3156 */ 3157 if (res_key != pr_reg->pr_res_key) { 3158 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3159 " res_key: 0x%016Lx does not match existing SA REGISTER" 3160 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3161 ret = TCM_RESERVATION_CONFLICT; 3162 goto out_put_pr_reg; 3163 } 3164 /* 3165 * The service active reservation key needs to be non zero 3166 */ 3167 if (!sa_res_key) { 3168 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3169 " sa_res_key\n"); 3170 ret = TCM_INVALID_PARAMETER_LIST; 3171 goto out_put_pr_reg; 3172 } 3173 3174 /* 3175 * Determine the Relative Target Port Identifier where the reservation 3176 * will be moved to for the TransportID containing SCSI initiator WWN 3177 * information. 3178 */ 3179 buf = transport_kmap_data_sg(cmd); 3180 if (!buf) { 3181 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3182 goto out_put_pr_reg; 3183 } 3184 3185 rtpi = (buf[18] & 0xff) << 8; 3186 rtpi |= buf[19] & 0xff; 3187 tid_len = (buf[20] & 0xff) << 24; 3188 tid_len |= (buf[21] & 0xff) << 16; 3189 tid_len |= (buf[22] & 0xff) << 8; 3190 tid_len |= buf[23] & 0xff; 3191 transport_kunmap_data_sg(cmd); 3192 buf = NULL; 3193 3194 if ((tid_len + 24) != cmd->data_length) { 3195 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3196 " does not equal CDB data_length: %u\n", tid_len, 3197 cmd->data_length); 3198 ret = TCM_INVALID_PARAMETER_LIST; 3199 goto out_put_pr_reg; 3200 } 3201 3202 spin_lock(&dev->se_port_lock); 3203 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3204 if (tmp_lun->lun_rtpi != rtpi) 3205 continue; 3206 dest_se_tpg = tmp_lun->lun_tpg; 3207 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3208 if (!dest_tf_ops) 3209 continue; 3210 3211 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3212 spin_unlock(&dev->se_port_lock); 3213 3214 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3215 pr_err("core_scsi3_tpg_depend_item() failed" 3216 " for dest_se_tpg\n"); 3217 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3218 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3219 goto out_put_pr_reg; 3220 } 3221 3222 spin_lock(&dev->se_port_lock); 3223 break; 3224 } 3225 spin_unlock(&dev->se_port_lock); 3226 3227 if (!dest_se_tpg || !dest_tf_ops) { 3228 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3229 " fabric ops from Relative Target Port Identifier:" 3230 " %hu\n", rtpi); 3231 ret = TCM_INVALID_PARAMETER_LIST; 3232 goto out_put_pr_reg; 3233 } 3234 3235 buf = transport_kmap_data_sg(cmd); 3236 if (!buf) { 3237 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3238 goto out_put_pr_reg; 3239 } 3240 proto_ident = (buf[24] & 0x0f); 3241 3242 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3243 " 0x%02x\n", proto_ident); 3244 3245 if (proto_ident != dest_se_tpg->proto_id) { 3246 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3247 " proto_ident: 0x%02x does not match ident: 0x%02x" 3248 " from fabric: %s\n", proto_ident, 3249 dest_se_tpg->proto_id, 3250 dest_tf_ops->get_fabric_name()); 3251 ret = TCM_INVALID_PARAMETER_LIST; 3252 goto out; 3253 } 3254 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3255 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3256 if (!initiator_str) { 3257 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3258 " initiator_str from Transport ID\n"); 3259 ret = TCM_INVALID_PARAMETER_LIST; 3260 goto out; 3261 } 3262 3263 transport_kunmap_data_sg(cmd); 3264 buf = NULL; 3265 3266 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3267 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3268 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3269 iport_ptr : ""); 3270 /* 3271 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3272 * action specifies a TransportID that is the same as the initiator port 3273 * of the I_T nexus for the command received, then the command shall 3274 * be terminated with CHECK CONDITION status, with the sense key set to 3275 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3276 * IN PARAMETER LIST. 3277 */ 3278 pr_reg_nacl = pr_reg->pr_reg_nacl; 3279 matching_iname = (!strcmp(initiator_str, 3280 pr_reg_nacl->initiatorname)) ? 1 : 0; 3281 if (!matching_iname) 3282 goto after_iport_check; 3283 3284 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3285 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3286 " matches: %s on received I_T Nexus\n", initiator_str, 3287 pr_reg_nacl->initiatorname); 3288 ret = TCM_INVALID_PARAMETER_LIST; 3289 goto out; 3290 } 3291 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3292 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3293 " matches: %s %s on received I_T Nexus\n", 3294 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3295 pr_reg->pr_reg_isid); 3296 ret = TCM_INVALID_PARAMETER_LIST; 3297 goto out; 3298 } 3299 after_iport_check: 3300 /* 3301 * Locate the destination struct se_node_acl from the received Transport ID 3302 */ 3303 mutex_lock(&dest_se_tpg->acl_node_mutex); 3304 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3305 initiator_str); 3306 if (dest_node_acl) 3307 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3308 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3309 3310 if (!dest_node_acl) { 3311 pr_err("Unable to locate %s dest_node_acl for" 3312 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3313 initiator_str); 3314 ret = TCM_INVALID_PARAMETER_LIST; 3315 goto out; 3316 } 3317 3318 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3319 pr_err("core_scsi3_nodeacl_depend_item() for" 3320 " dest_node_acl\n"); 3321 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3322 dest_node_acl = NULL; 3323 ret = TCM_INVALID_PARAMETER_LIST; 3324 goto out; 3325 } 3326 3327 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3328 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3329 dest_node_acl->initiatorname); 3330 3331 /* 3332 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3333 * PORT IDENTIFIER. 3334 */ 3335 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3336 if (!dest_se_deve) { 3337 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3338 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3339 ret = TCM_INVALID_PARAMETER_LIST; 3340 goto out; 3341 } 3342 3343 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3344 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3345 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3346 dest_se_deve = NULL; 3347 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3348 goto out; 3349 } 3350 3351 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3352 " ACL for dest_se_deve->mapped_lun: %u\n", 3353 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3354 dest_se_deve->mapped_lun); 3355 3356 /* 3357 * A persistent reservation needs to already existing in order to 3358 * successfully complete the REGISTER_AND_MOVE service action.. 3359 */ 3360 spin_lock(&dev->dev_reservation_lock); 3361 pr_res_holder = dev->dev_pr_res_holder; 3362 if (!pr_res_holder) { 3363 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3364 " currently held\n"); 3365 spin_unlock(&dev->dev_reservation_lock); 3366 ret = TCM_INVALID_CDB_FIELD; 3367 goto out; 3368 } 3369 /* 3370 * The received on I_T Nexus must be the reservation holder. 3371 * 3372 * From spc4r17 section 5.7.8 Table 50 -- 3373 * Register behaviors for a REGISTER AND MOVE service action 3374 */ 3375 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3376 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3377 " Nexus is not reservation holder\n"); 3378 spin_unlock(&dev->dev_reservation_lock); 3379 ret = TCM_RESERVATION_CONFLICT; 3380 goto out; 3381 } 3382 /* 3383 * From spc4r17 section 5.7.8: registering and moving reservation 3384 * 3385 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3386 * action is received and the established persistent reservation is a 3387 * Write Exclusive - All Registrants type or Exclusive Access - 3388 * All Registrants type reservation, then the command shall be completed 3389 * with RESERVATION CONFLICT status. 3390 */ 3391 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3392 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3393 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3394 " reservation for type: %s\n", 3395 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3396 spin_unlock(&dev->dev_reservation_lock); 3397 ret = TCM_RESERVATION_CONFLICT; 3398 goto out; 3399 } 3400 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3401 /* 3402 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3403 */ 3404 type = pr_res_holder->pr_res_type; 3405 scope = pr_res_holder->pr_res_type; 3406 /* 3407 * c) Associate the reservation key specified in the SERVICE ACTION 3408 * RESERVATION KEY field with the I_T nexus specified as the 3409 * destination of the register and move, where: 3410 * A) The I_T nexus is specified by the TransportID and the 3411 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3412 * B) Regardless of the TransportID format used, the association for 3413 * the initiator port is based on either the initiator port name 3414 * (see 3.1.71) on SCSI transport protocols where port names are 3415 * required or the initiator port identifier (see 3.1.70) on SCSI 3416 * transport protocols where port names are not required; 3417 * d) Register the reservation key specified in the SERVICE ACTION 3418 * RESERVATION KEY field; 3419 * e) Retain the reservation key specified in the SERVICE ACTION 3420 * RESERVATION KEY field and associated information; 3421 * 3422 * Also, It is not an error for a REGISTER AND MOVE service action to 3423 * register an I_T nexus that is already registered with the same 3424 * reservation key or a different reservation key. 3425 */ 3426 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3427 iport_ptr); 3428 if (!dest_pr_reg) { 3429 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3430 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 3431 3432 spin_unlock(&dev->dev_reservation_lock); 3433 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3434 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3435 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3436 ret = TCM_INVALID_PARAMETER_LIST; 3437 goto out; 3438 } 3439 spin_lock(&dev->dev_reservation_lock); 3440 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3441 iport_ptr); 3442 new_reg = 1; 3443 } 3444 /* 3445 * f) Release the persistent reservation for the persistent reservation 3446 * holder (i.e., the I_T nexus on which the 3447 */ 3448 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3449 dev->dev_pr_res_holder, 0, 0); 3450 /* 3451 * g) Move the persistent reservation to the specified I_T nexus using 3452 * the same scope and type as the persistent reservation released in 3453 * item f); and 3454 */ 3455 dev->dev_pr_res_holder = dest_pr_reg; 3456 dest_pr_reg->pr_res_holder = 1; 3457 dest_pr_reg->pr_res_type = type; 3458 pr_reg->pr_res_scope = scope; 3459 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3460 /* 3461 * Increment PRGeneration for existing registrations.. 3462 */ 3463 if (!new_reg) 3464 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3465 spin_unlock(&dev->dev_reservation_lock); 3466 3467 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3468 " created new reservation holder TYPE: %s on object RTPI:" 3469 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3470 core_scsi3_pr_dump_type(type), rtpi, 3471 dest_pr_reg->pr_res_generation); 3472 pr_debug("SPC-3 PR Successfully moved reservation from" 3473 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3474 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3475 i_buf, dest_tf_ops->get_fabric_name(), 3476 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3477 iport_ptr : ""); 3478 /* 3479 * It is now safe to release configfs group dependencies for destination 3480 * of Transport ID Initiator Device/Port Identifier 3481 */ 3482 core_scsi3_lunacl_undepend_item(dest_se_deve); 3483 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3484 core_scsi3_tpg_undepend_item(dest_se_tpg); 3485 /* 3486 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3487 * nexus on which PERSISTENT RESERVE OUT command was received. 3488 */ 3489 if (unreg) { 3490 spin_lock(&pr_tmpl->registration_lock); 3491 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3492 spin_unlock(&pr_tmpl->registration_lock); 3493 } else 3494 core_scsi3_put_pr_reg(pr_reg); 3495 3496 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3497 3498 transport_kunmap_data_sg(cmd); 3499 3500 core_scsi3_put_pr_reg(dest_pr_reg); 3501 return 0; 3502 out: 3503 if (buf) 3504 transport_kunmap_data_sg(cmd); 3505 if (dest_se_deve) 3506 core_scsi3_lunacl_undepend_item(dest_se_deve); 3507 if (dest_node_acl) 3508 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3509 core_scsi3_tpg_undepend_item(dest_se_tpg); 3510 3511 out_put_pr_reg: 3512 core_scsi3_put_pr_reg(pr_reg); 3513 return ret; 3514 } 3515 3516 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3517 { 3518 unsigned int __v1, __v2; 3519 3520 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3521 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3522 3523 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3524 } 3525 3526 /* 3527 * See spc4r17 section 6.14 Table 170 3528 */ 3529 sense_reason_t 3530 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3531 { 3532 struct se_device *dev = cmd->se_dev; 3533 unsigned char *cdb = &cmd->t_task_cdb[0]; 3534 unsigned char *buf; 3535 u64 res_key, sa_res_key; 3536 int sa, scope, type, aptpl; 3537 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3538 sense_reason_t ret; 3539 3540 /* 3541 * Following spc2r20 5.5.1 Reservations overview: 3542 * 3543 * If a logical unit has been reserved by any RESERVE command and is 3544 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3545 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3546 * initiator or service action and shall terminate with a RESERVATION 3547 * CONFLICT status. 3548 */ 3549 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3550 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3551 " SPC-2 reservation is held, returning" 3552 " RESERVATION_CONFLICT\n"); 3553 return TCM_RESERVATION_CONFLICT; 3554 } 3555 3556 /* 3557 * FIXME: A NULL struct se_session pointer means an this is not coming from 3558 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3559 */ 3560 if (!cmd->se_sess) 3561 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3562 3563 if (cmd->data_length < 24) { 3564 pr_warn("SPC-PR: Received PR OUT parameter list" 3565 " length too small: %u\n", cmd->data_length); 3566 return TCM_INVALID_PARAMETER_LIST; 3567 } 3568 3569 /* 3570 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3571 */ 3572 sa = (cdb[1] & 0x1f); 3573 scope = (cdb[2] & 0xf0); 3574 type = (cdb[2] & 0x0f); 3575 3576 buf = transport_kmap_data_sg(cmd); 3577 if (!buf) 3578 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3579 3580 /* 3581 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3582 */ 3583 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3584 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3585 /* 3586 * REGISTER_AND_MOVE uses a different SA parameter list containing 3587 * SCSI TransportIDs. 3588 */ 3589 if (sa != PRO_REGISTER_AND_MOVE) { 3590 spec_i_pt = (buf[20] & 0x08); 3591 all_tg_pt = (buf[20] & 0x04); 3592 aptpl = (buf[20] & 0x01); 3593 } else { 3594 aptpl = (buf[17] & 0x01); 3595 unreg = (buf[17] & 0x02); 3596 } 3597 /* 3598 * If the backend device has been configured to force APTPL metadata 3599 * write-out, go ahead and propigate aptpl=1 down now. 3600 */ 3601 if (dev->dev_attrib.force_pr_aptpl) 3602 aptpl = 1; 3603 3604 transport_kunmap_data_sg(cmd); 3605 buf = NULL; 3606 3607 /* 3608 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3609 */ 3610 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3611 return TCM_INVALID_PARAMETER_LIST; 3612 3613 /* 3614 * From spc4r17 section 6.14: 3615 * 3616 * If the SPEC_I_PT bit is set to zero, the service action is not 3617 * REGISTER AND MOVE, and the parameter list length is not 24, then 3618 * the command shall be terminated with CHECK CONDITION status, with 3619 * the sense key set to ILLEGAL REQUEST, and the additional sense 3620 * code set to PARAMETER LIST LENGTH ERROR. 3621 */ 3622 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3623 (cmd->data_length != 24)) { 3624 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3625 " list length: %u\n", cmd->data_length); 3626 return TCM_INVALID_PARAMETER_LIST; 3627 } 3628 3629 /* 3630 * (core_scsi3_emulate_pro_* function parameters 3631 * are defined by spc4r17 Table 174: 3632 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3633 */ 3634 switch (sa) { 3635 case PRO_REGISTER: 3636 ret = core_scsi3_emulate_pro_register(cmd, 3637 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3638 break; 3639 case PRO_RESERVE: 3640 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3641 break; 3642 case PRO_RELEASE: 3643 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3644 break; 3645 case PRO_CLEAR: 3646 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3647 break; 3648 case PRO_PREEMPT: 3649 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3650 res_key, sa_res_key, PREEMPT); 3651 break; 3652 case PRO_PREEMPT_AND_ABORT: 3653 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3654 res_key, sa_res_key, PREEMPT_AND_ABORT); 3655 break; 3656 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3657 ret = core_scsi3_emulate_pro_register(cmd, 3658 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3659 break; 3660 case PRO_REGISTER_AND_MOVE: 3661 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3662 sa_res_key, aptpl, unreg); 3663 break; 3664 default: 3665 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3666 " action: 0x%02x\n", cdb[1] & 0x1f); 3667 return TCM_INVALID_CDB_FIELD; 3668 } 3669 3670 if (!ret) 3671 target_complete_cmd(cmd, GOOD); 3672 return ret; 3673 } 3674 3675 /* 3676 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3677 * 3678 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3679 */ 3680 static sense_reason_t 3681 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3682 { 3683 struct se_device *dev = cmd->se_dev; 3684 struct t10_pr_registration *pr_reg; 3685 unsigned char *buf; 3686 u32 add_len = 0, off = 8; 3687 3688 if (cmd->data_length < 8) { 3689 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3690 " too small\n", cmd->data_length); 3691 return TCM_INVALID_CDB_FIELD; 3692 } 3693 3694 buf = transport_kmap_data_sg(cmd); 3695 if (!buf) 3696 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3697 3698 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3699 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3700 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3701 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3702 3703 spin_lock(&dev->t10_pr.registration_lock); 3704 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3705 pr_reg_list) { 3706 /* 3707 * Check for overflow of 8byte PRI READ_KEYS payload and 3708 * next reservation key list descriptor. 3709 */ 3710 if ((add_len + 8) > (cmd->data_length - 8)) 3711 break; 3712 3713 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3714 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3715 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3716 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3717 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3718 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3719 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3720 buf[off++] = (pr_reg->pr_res_key & 0xff); 3721 3722 add_len += 8; 3723 } 3724 spin_unlock(&dev->t10_pr.registration_lock); 3725 3726 buf[4] = ((add_len >> 24) & 0xff); 3727 buf[5] = ((add_len >> 16) & 0xff); 3728 buf[6] = ((add_len >> 8) & 0xff); 3729 buf[7] = (add_len & 0xff); 3730 3731 transport_kunmap_data_sg(cmd); 3732 3733 return 0; 3734 } 3735 3736 /* 3737 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3738 * 3739 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3740 */ 3741 static sense_reason_t 3742 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3743 { 3744 struct se_device *dev = cmd->se_dev; 3745 struct t10_pr_registration *pr_reg; 3746 unsigned char *buf; 3747 u64 pr_res_key; 3748 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3749 3750 if (cmd->data_length < 8) { 3751 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3752 " too small\n", cmd->data_length); 3753 return TCM_INVALID_CDB_FIELD; 3754 } 3755 3756 buf = transport_kmap_data_sg(cmd); 3757 if (!buf) 3758 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3759 3760 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3761 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3762 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3763 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3764 3765 spin_lock(&dev->dev_reservation_lock); 3766 pr_reg = dev->dev_pr_res_holder; 3767 if (pr_reg) { 3768 /* 3769 * Set the hardcoded Additional Length 3770 */ 3771 buf[4] = ((add_len >> 24) & 0xff); 3772 buf[5] = ((add_len >> 16) & 0xff); 3773 buf[6] = ((add_len >> 8) & 0xff); 3774 buf[7] = (add_len & 0xff); 3775 3776 if (cmd->data_length < 22) 3777 goto err; 3778 3779 /* 3780 * Set the Reservation key. 3781 * 3782 * From spc4r17, section 5.7.10: 3783 * A persistent reservation holder has its reservation key 3784 * returned in the parameter data from a PERSISTENT 3785 * RESERVE IN command with READ RESERVATION service action as 3786 * follows: 3787 * a) For a persistent reservation of the type Write Exclusive 3788 * - All Registrants or Exclusive Access All Regitrants, 3789 * the reservation key shall be set to zero; or 3790 * b) For all other persistent reservation types, the 3791 * reservation key shall be set to the registered 3792 * reservation key for the I_T nexus that holds the 3793 * persistent reservation. 3794 */ 3795 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3796 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3797 pr_res_key = 0; 3798 else 3799 pr_res_key = pr_reg->pr_res_key; 3800 3801 buf[8] = ((pr_res_key >> 56) & 0xff); 3802 buf[9] = ((pr_res_key >> 48) & 0xff); 3803 buf[10] = ((pr_res_key >> 40) & 0xff); 3804 buf[11] = ((pr_res_key >> 32) & 0xff); 3805 buf[12] = ((pr_res_key >> 24) & 0xff); 3806 buf[13] = ((pr_res_key >> 16) & 0xff); 3807 buf[14] = ((pr_res_key >> 8) & 0xff); 3808 buf[15] = (pr_res_key & 0xff); 3809 /* 3810 * Set the SCOPE and TYPE 3811 */ 3812 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3813 (pr_reg->pr_res_type & 0x0f); 3814 } 3815 3816 err: 3817 spin_unlock(&dev->dev_reservation_lock); 3818 transport_kunmap_data_sg(cmd); 3819 3820 return 0; 3821 } 3822 3823 /* 3824 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3825 * 3826 * See spc4r17 section 6.13.4 Table 165 3827 */ 3828 static sense_reason_t 3829 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3830 { 3831 struct se_device *dev = cmd->se_dev; 3832 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3833 unsigned char *buf; 3834 u16 add_len = 8; /* Hardcoded to 8. */ 3835 3836 if (cmd->data_length < 6) { 3837 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3838 " %u too small\n", cmd->data_length); 3839 return TCM_INVALID_CDB_FIELD; 3840 } 3841 3842 buf = transport_kmap_data_sg(cmd); 3843 if (!buf) 3844 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3845 3846 buf[0] = ((add_len >> 8) & 0xff); 3847 buf[1] = (add_len & 0xff); 3848 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3849 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3850 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3851 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3852 /* 3853 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3854 * set the TMV: Task Mask Valid bit. 3855 */ 3856 buf[3] |= 0x80; 3857 /* 3858 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3859 */ 3860 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3861 /* 3862 * PTPL_A: Persistence across Target Power Loss Active bit 3863 */ 3864 if (pr_tmpl->pr_aptpl_active) 3865 buf[3] |= 0x01; 3866 /* 3867 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3868 */ 3869 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3870 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3871 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3872 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3873 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3874 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3875 3876 transport_kunmap_data_sg(cmd); 3877 3878 return 0; 3879 } 3880 3881 /* 3882 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3883 * 3884 * See spc4r17 section 6.13.5 Table 168 and 169 3885 */ 3886 static sense_reason_t 3887 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3888 { 3889 struct se_device *dev = cmd->se_dev; 3890 struct se_node_acl *se_nacl; 3891 struct se_portal_group *se_tpg; 3892 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3893 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3894 unsigned char *buf; 3895 u32 add_desc_len = 0, add_len = 0; 3896 u32 off = 8; /* off into first Full Status descriptor */ 3897 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3898 int exp_desc_len, desc_len; 3899 bool all_reg = false; 3900 3901 if (cmd->data_length < 8) { 3902 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3903 " too small\n", cmd->data_length); 3904 return TCM_INVALID_CDB_FIELD; 3905 } 3906 3907 buf = transport_kmap_data_sg(cmd); 3908 if (!buf) 3909 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3910 3911 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3912 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3913 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3914 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3915 3916 spin_lock(&dev->dev_reservation_lock); 3917 if (dev->dev_pr_res_holder) { 3918 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3919 3920 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3921 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3922 all_reg = true; 3923 pr_res_type = pr_holder->pr_res_type; 3924 pr_res_scope = pr_holder->pr_res_scope; 3925 } 3926 } 3927 spin_unlock(&dev->dev_reservation_lock); 3928 3929 spin_lock(&pr_tmpl->registration_lock); 3930 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3931 &pr_tmpl->registration_list, pr_reg_list) { 3932 3933 se_nacl = pr_reg->pr_reg_nacl; 3934 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3935 add_desc_len = 0; 3936 3937 atomic_inc_mb(&pr_reg->pr_res_holders); 3938 spin_unlock(&pr_tmpl->registration_lock); 3939 /* 3940 * Determine expected length of $FABRIC_MOD specific 3941 * TransportID full status descriptor.. 3942 */ 3943 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3944 &format_code); 3945 if (exp_desc_len < 0 || 3946 exp_desc_len + add_len > cmd->data_length) { 3947 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3948 " out of buffer: %d\n", cmd->data_length); 3949 spin_lock(&pr_tmpl->registration_lock); 3950 atomic_dec_mb(&pr_reg->pr_res_holders); 3951 break; 3952 } 3953 /* 3954 * Set RESERVATION KEY 3955 */ 3956 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3957 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3958 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3959 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3960 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3961 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3962 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3963 buf[off++] = (pr_reg->pr_res_key & 0xff); 3964 off += 4; /* Skip Over Reserved area */ 3965 3966 /* 3967 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3968 */ 3969 if (pr_reg->pr_reg_all_tg_pt) 3970 buf[off] = 0x02; 3971 /* 3972 * The struct se_lun pointer will be present for the 3973 * reservation holder for PR_HOLDER bit. 3974 * 3975 * Also, if this registration is the reservation 3976 * holder or there is an All Registrants reservation 3977 * active, fill in SCOPE and TYPE in the next byte. 3978 */ 3979 if (pr_reg->pr_res_holder) { 3980 buf[off++] |= 0x01; 3981 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3982 (pr_reg->pr_res_type & 0x0f); 3983 } else if (all_reg) { 3984 buf[off++] |= 0x01; 3985 buf[off++] = (pr_res_scope & 0xf0) | 3986 (pr_res_type & 0x0f); 3987 } else { 3988 off += 2; 3989 } 3990 3991 off += 4; /* Skip over reserved area */ 3992 /* 3993 * From spc4r17 6.3.15: 3994 * 3995 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3996 * IDENTIFIER field contains the relative port identifier (see 3997 * 3.1.120) of the target port that is part of the I_T nexus 3998 * described by this full status descriptor. If the ALL_TG_PT 3999 * bit is set to one, the contents of the RELATIVE TARGET PORT 4000 * IDENTIFIER field are not defined by this standard. 4001 */ 4002 if (!pr_reg->pr_reg_all_tg_pt) { 4003 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4004 4005 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4006 buf[off++] = (sep_rtpi & 0xff); 4007 } else 4008 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4009 4010 buf[off+4] = se_tpg->proto_id; 4011 4012 /* 4013 * Now, have the $FABRIC_MOD fill in the transport ID. 4014 */ 4015 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4016 &format_code, &buf[off+4]); 4017 4018 spin_lock(&pr_tmpl->registration_lock); 4019 atomic_dec_mb(&pr_reg->pr_res_holders); 4020 4021 if (desc_len < 0) 4022 break; 4023 /* 4024 * Set the ADDITIONAL DESCRIPTOR LENGTH 4025 */ 4026 buf[off++] = ((desc_len >> 24) & 0xff); 4027 buf[off++] = ((desc_len >> 16) & 0xff); 4028 buf[off++] = ((desc_len >> 8) & 0xff); 4029 buf[off++] = (desc_len & 0xff); 4030 /* 4031 * Size of full desctipor header minus TransportID 4032 * containing $FABRIC_MOD specific) initiator device/port 4033 * WWN information. 4034 * 4035 * See spc4r17 Section 6.13.5 Table 169 4036 */ 4037 add_desc_len = (24 + desc_len); 4038 4039 off += desc_len; 4040 add_len += add_desc_len; 4041 } 4042 spin_unlock(&pr_tmpl->registration_lock); 4043 /* 4044 * Set ADDITIONAL_LENGTH 4045 */ 4046 buf[4] = ((add_len >> 24) & 0xff); 4047 buf[5] = ((add_len >> 16) & 0xff); 4048 buf[6] = ((add_len >> 8) & 0xff); 4049 buf[7] = (add_len & 0xff); 4050 4051 transport_kunmap_data_sg(cmd); 4052 4053 return 0; 4054 } 4055 4056 sense_reason_t 4057 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4058 { 4059 sense_reason_t ret; 4060 4061 /* 4062 * Following spc2r20 5.5.1 Reservations overview: 4063 * 4064 * If a logical unit has been reserved by any RESERVE command and is 4065 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4066 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4067 * initiator or service action and shall terminate with a RESERVATION 4068 * CONFLICT status. 4069 */ 4070 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4071 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4072 " SPC-2 reservation is held, returning" 4073 " RESERVATION_CONFLICT\n"); 4074 return TCM_RESERVATION_CONFLICT; 4075 } 4076 4077 switch (cmd->t_task_cdb[1] & 0x1f) { 4078 case PRI_READ_KEYS: 4079 ret = core_scsi3_pri_read_keys(cmd); 4080 break; 4081 case PRI_READ_RESERVATION: 4082 ret = core_scsi3_pri_read_reservation(cmd); 4083 break; 4084 case PRI_REPORT_CAPABILITIES: 4085 ret = core_scsi3_pri_report_capabilities(cmd); 4086 break; 4087 case PRI_READ_FULL_STATUS: 4088 ret = core_scsi3_pri_read_full_status(cmd); 4089 break; 4090 default: 4091 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4092 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4093 return TCM_INVALID_CDB_FIELD; 4094 } 4095 4096 if (!ret) 4097 target_complete_cmd(cmd, GOOD); 4098 return ret; 4099 } 4100 4101 sense_reason_t 4102 target_check_reservation(struct se_cmd *cmd) 4103 { 4104 struct se_device *dev = cmd->se_dev; 4105 sense_reason_t ret; 4106 4107 if (!cmd->se_sess) 4108 return 0; 4109 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4110 return 0; 4111 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4112 return 0; 4113 4114 spin_lock(&dev->dev_reservation_lock); 4115 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4116 ret = target_scsi2_reservation_check(cmd); 4117 else 4118 ret = target_scsi3_pr_reservation_check(cmd); 4119 spin_unlock(&dev->dev_reservation_lock); 4120 4121 return ret; 4122 } 4123