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_sep->sep_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; 684 struct se_port *port, *port_tmp; 685 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 686 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 687 int ret; 688 /* 689 * Create a registration for the I_T Nexus upon which the 690 * PROUT REGISTER was received. 691 */ 692 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 693 isid, sa_res_key, all_tg_pt, 694 aptpl); 695 if (!pr_reg) 696 return NULL; 697 /* 698 * Return pointer to pr_reg for ALL_TG_PT=0 699 */ 700 if (!all_tg_pt) 701 return pr_reg; 702 /* 703 * Create list of matching SCSI Initiator Port registrations 704 * for ALL_TG_PT=1 705 */ 706 spin_lock(&dev->se_port_lock); 707 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 708 atomic_inc_mb(&port->sep_tg_pt_ref_cnt); 709 spin_unlock(&dev->se_port_lock); 710 711 spin_lock_bh(&port->sep_alua_lock); 712 list_for_each_entry(deve_tmp, &port->sep_alua_list, 713 alua_port_list) { 714 /* 715 * This pointer will be NULL for demo mode MappedLUNs 716 * that have not been make explicit via a ConfigFS 717 * MappedLUN group for the SCSI Initiator Node ACL. 718 */ 719 if (!deve_tmp->se_lun_acl) 720 continue; 721 722 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 723 lockdep_is_held(&port->sep_alua_lock)); 724 nacl_tmp = lacl_tmp->se_lun_nacl; 725 /* 726 * Skip the matching struct se_node_acl that is allocated 727 * above.. 728 */ 729 if (nacl == nacl_tmp) 730 continue; 731 /* 732 * Only perform PR registrations for target ports on 733 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 734 * arrived. 735 */ 736 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 737 continue; 738 /* 739 * Look for a matching Initiator Node ACL in ASCII format 740 */ 741 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 742 continue; 743 744 kref_get(&deve_tmp->pr_kref); 745 spin_unlock_bh(&port->sep_alua_lock); 746 /* 747 * Grab a configfs group dependency that is released 748 * for the exception path at label out: below, or upon 749 * completion of adding ALL_TG_PT=1 registrations in 750 * __core_scsi3_add_registration() 751 */ 752 ret = core_scsi3_lunacl_depend_item(deve_tmp); 753 if (ret < 0) { 754 pr_err("core_scsi3_lunacl_depend" 755 "_item() failed\n"); 756 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 757 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 758 goto out; 759 } 760 /* 761 * Located a matching SCSI Initiator Port on a different 762 * port, allocate the pr_reg_atp and attach it to the 763 * pr_reg->pr_reg_atp_list that will be processed once 764 * the original *pr_reg is processed in 765 * __core_scsi3_add_registration() 766 */ 767 lun_tmp = rcu_dereference_check(deve_tmp->se_lun, 768 atomic_read(&deve_tmp->pr_kref.refcount) != 0); 769 770 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 771 nacl_tmp, lun_tmp, deve_tmp, 772 deve_tmp->mapped_lun, NULL, 773 sa_res_key, all_tg_pt, aptpl); 774 if (!pr_reg_atp) { 775 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 776 core_scsi3_lunacl_undepend_item(deve_tmp); 777 goto out; 778 } 779 780 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 781 &pr_reg->pr_reg_atp_list); 782 spin_lock_bh(&port->sep_alua_lock); 783 } 784 spin_unlock_bh(&port->sep_alua_lock); 785 786 spin_lock(&dev->se_port_lock); 787 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 788 } 789 spin_unlock(&dev->se_port_lock); 790 791 return pr_reg; 792 out: 793 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 794 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 795 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 796 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 797 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 798 } 799 kmem_cache_free(t10_pr_reg_cache, pr_reg); 800 return NULL; 801 } 802 803 int core_scsi3_alloc_aptpl_registration( 804 struct t10_reservation *pr_tmpl, 805 u64 sa_res_key, 806 unsigned char *i_port, 807 unsigned char *isid, 808 u32 mapped_lun, 809 unsigned char *t_port, 810 u16 tpgt, 811 u32 target_lun, 812 int res_holder, 813 int all_tg_pt, 814 u8 type) 815 { 816 struct t10_pr_registration *pr_reg; 817 818 if (!i_port || !t_port || !sa_res_key) { 819 pr_err("Illegal parameters for APTPL registration\n"); 820 return -EINVAL; 821 } 822 823 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 824 if (!pr_reg) { 825 pr_err("Unable to allocate struct t10_pr_registration\n"); 826 return -ENOMEM; 827 } 828 829 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 830 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 831 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 832 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 833 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 834 atomic_set(&pr_reg->pr_res_holders, 0); 835 pr_reg->pr_reg_nacl = NULL; 836 pr_reg->pr_reg_deve = NULL; 837 pr_reg->pr_res_mapped_lun = mapped_lun; 838 pr_reg->pr_aptpl_target_lun = target_lun; 839 pr_reg->pr_res_key = sa_res_key; 840 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 841 pr_reg->pr_reg_aptpl = 1; 842 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 843 pr_reg->pr_res_type = type; 844 /* 845 * If an ISID value had been saved in APTPL metadata for this 846 * SCSI Initiator Port, restore it now. 847 */ 848 if (isid != NULL) { 849 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 850 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 851 pr_reg->isid_present_at_reg = 1; 852 } 853 /* 854 * Copy the i_port and t_port information from caller. 855 */ 856 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 857 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 858 pr_reg->pr_reg_tpgt = tpgt; 859 /* 860 * Set pr_res_holder from caller, the pr_reg who is the reservation 861 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 862 * the Initiator Node LUN ACL from the fabric module is created for 863 * this registration. 864 */ 865 pr_reg->pr_res_holder = res_holder; 866 867 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 868 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 869 " metadata\n", (res_holder) ? "+reservation" : ""); 870 return 0; 871 } 872 873 static void core_scsi3_aptpl_reserve( 874 struct se_device *dev, 875 struct se_portal_group *tpg, 876 struct se_node_acl *node_acl, 877 struct t10_pr_registration *pr_reg) 878 { 879 char i_buf[PR_REG_ISID_ID_LEN]; 880 881 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 882 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 883 884 spin_lock(&dev->dev_reservation_lock); 885 dev->dev_pr_res_holder = pr_reg; 886 spin_unlock(&dev->dev_reservation_lock); 887 888 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 889 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 890 tpg->se_tpg_tfo->get_fabric_name(), 891 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 892 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 893 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 894 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 895 i_buf); 896 } 897 898 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 899 struct t10_pr_registration *, enum register_type, int); 900 901 static int __core_scsi3_check_aptpl_registration( 902 struct se_device *dev, 903 struct se_portal_group *tpg, 904 struct se_lun *lun, 905 u32 target_lun, 906 struct se_node_acl *nacl, 907 u32 mapped_lun) 908 { 909 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 910 struct t10_reservation *pr_tmpl = &dev->t10_pr; 911 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 912 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 913 u16 tpgt; 914 915 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 916 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 917 /* 918 * Copy Initiator Port information from struct se_node_acl 919 */ 920 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 921 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 922 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 923 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 924 /* 925 * Look for the matching registrations+reservation from those 926 * created from APTPL metadata. Note that multiple registrations 927 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 928 * TransportIDs. 929 */ 930 spin_lock(&pr_tmpl->aptpl_reg_lock); 931 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 932 pr_reg_aptpl_list) { 933 934 if (!strcmp(pr_reg->pr_iport, i_port) && 935 (pr_reg->pr_res_mapped_lun == mapped_lun) && 936 !(strcmp(pr_reg->pr_tport, t_port)) && 937 (pr_reg->pr_reg_tpgt == tpgt) && 938 (pr_reg->pr_aptpl_target_lun == target_lun)) { 939 940 pr_reg->pr_reg_nacl = nacl; 941 pr_reg->tg_pt_sep_rtpi = lun->lun_sep->sep_rtpi; 942 943 list_del(&pr_reg->pr_reg_aptpl_list); 944 spin_unlock(&pr_tmpl->aptpl_reg_lock); 945 /* 946 * At this point all of the pointers in *pr_reg will 947 * be setup, so go ahead and add the registration. 948 */ 949 950 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 951 /* 952 * If this registration is the reservation holder, 953 * make that happen now.. 954 */ 955 if (pr_reg->pr_res_holder) 956 core_scsi3_aptpl_reserve(dev, tpg, 957 nacl, pr_reg); 958 /* 959 * Reenable pr_aptpl_active to accept new metadata 960 * updates once the SCSI device is active again.. 961 */ 962 spin_lock(&pr_tmpl->aptpl_reg_lock); 963 pr_tmpl->pr_aptpl_active = 1; 964 } 965 } 966 spin_unlock(&pr_tmpl->aptpl_reg_lock); 967 968 return 0; 969 } 970 971 int core_scsi3_check_aptpl_registration( 972 struct se_device *dev, 973 struct se_portal_group *tpg, 974 struct se_lun *lun, 975 struct se_node_acl *nacl, 976 u32 mapped_lun) 977 { 978 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 979 return 0; 980 981 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 982 lun->unpacked_lun, nacl, 983 mapped_lun); 984 } 985 986 static void __core_scsi3_dump_registration( 987 const struct target_core_fabric_ops *tfo, 988 struct se_device *dev, 989 struct se_node_acl *nacl, 990 struct t10_pr_registration *pr_reg, 991 enum register_type register_type) 992 { 993 struct se_portal_group *se_tpg = nacl->se_tpg; 994 char i_buf[PR_REG_ISID_ID_LEN]; 995 996 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 997 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 998 999 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1000 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1001 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1002 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1003 i_buf); 1004 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1005 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1006 tfo->tpg_get_tag(se_tpg)); 1007 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1008 " Port(s)\n", tfo->get_fabric_name(), 1009 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1010 dev->transport->name); 1011 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1012 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1013 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1014 pr_reg->pr_reg_aptpl); 1015 } 1016 1017 static void __core_scsi3_add_registration( 1018 struct se_device *dev, 1019 struct se_node_acl *nacl, 1020 struct t10_pr_registration *pr_reg, 1021 enum register_type register_type, 1022 int register_move) 1023 { 1024 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1025 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1026 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1027 struct se_dev_entry *deve; 1028 1029 /* 1030 * Increment PRgeneration counter for struct se_device upon a successful 1031 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1032 * 1033 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1034 * action, the struct se_device->dev_reservation_lock will already be held, 1035 * so we do not call core_scsi3_pr_generation() which grabs the lock 1036 * for the REGISTER. 1037 */ 1038 pr_reg->pr_res_generation = (register_move) ? 1039 dev->t10_pr.pr_generation++ : 1040 core_scsi3_pr_generation(dev); 1041 1042 spin_lock(&pr_tmpl->registration_lock); 1043 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1044 1045 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1046 spin_unlock(&pr_tmpl->registration_lock); 1047 1048 rcu_read_lock(); 1049 deve = pr_reg->pr_reg_deve; 1050 if (deve) 1051 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1052 rcu_read_unlock(); 1053 1054 /* 1055 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1056 */ 1057 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1058 return; 1059 /* 1060 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1061 * allocated in __core_scsi3_alloc_registration() 1062 */ 1063 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1064 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1065 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1066 1067 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1068 1069 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1070 1071 spin_lock(&pr_tmpl->registration_lock); 1072 list_add_tail(&pr_reg_tmp->pr_reg_list, 1073 &pr_tmpl->registration_list); 1074 1075 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1076 register_type); 1077 spin_unlock(&pr_tmpl->registration_lock); 1078 1079 rcu_read_lock(); 1080 deve = pr_reg_tmp->pr_reg_deve; 1081 if (deve) 1082 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1083 rcu_read_unlock(); 1084 1085 /* 1086 * Drop configfs group dependency reference from 1087 * __core_scsi3_alloc_registration() 1088 */ 1089 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1090 } 1091 } 1092 1093 static int core_scsi3_alloc_registration( 1094 struct se_device *dev, 1095 struct se_node_acl *nacl, 1096 struct se_lun *lun, 1097 struct se_dev_entry *deve, 1098 u32 mapped_lun, 1099 unsigned char *isid, 1100 u64 sa_res_key, 1101 int all_tg_pt, 1102 int aptpl, 1103 enum register_type register_type, 1104 int register_move) 1105 { 1106 struct t10_pr_registration *pr_reg; 1107 1108 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1109 isid, sa_res_key, all_tg_pt, 1110 aptpl); 1111 if (!pr_reg) 1112 return -EPERM; 1113 1114 __core_scsi3_add_registration(dev, nacl, pr_reg, 1115 register_type, register_move); 1116 return 0; 1117 } 1118 1119 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1120 struct se_device *dev, 1121 struct se_node_acl *nacl, 1122 unsigned char *isid) 1123 { 1124 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1125 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1126 struct se_portal_group *tpg; 1127 1128 spin_lock(&pr_tmpl->registration_lock); 1129 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1130 &pr_tmpl->registration_list, pr_reg_list) { 1131 /* 1132 * First look for a matching struct se_node_acl 1133 */ 1134 if (pr_reg->pr_reg_nacl != nacl) 1135 continue; 1136 1137 tpg = pr_reg->pr_reg_nacl->se_tpg; 1138 /* 1139 * If this registration does NOT contain a fabric provided 1140 * ISID, then we have found a match. 1141 */ 1142 if (!pr_reg->isid_present_at_reg) { 1143 /* 1144 * Determine if this SCSI device server requires that 1145 * SCSI Intiatior TransportID w/ ISIDs is enforced 1146 * for fabric modules (iSCSI) requiring them. 1147 */ 1148 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1149 if (dev->dev_attrib.enforce_pr_isids) 1150 continue; 1151 } 1152 atomic_inc_mb(&pr_reg->pr_res_holders); 1153 spin_unlock(&pr_tmpl->registration_lock); 1154 return pr_reg; 1155 } 1156 /* 1157 * If the *pr_reg contains a fabric defined ISID for multi-value 1158 * SCSI Initiator Port TransportIDs, then we expect a valid 1159 * matching ISID to be provided by the local SCSI Initiator Port. 1160 */ 1161 if (!isid) 1162 continue; 1163 if (strcmp(isid, pr_reg->pr_reg_isid)) 1164 continue; 1165 1166 atomic_inc_mb(&pr_reg->pr_res_holders); 1167 spin_unlock(&pr_tmpl->registration_lock); 1168 return pr_reg; 1169 } 1170 spin_unlock(&pr_tmpl->registration_lock); 1171 1172 return NULL; 1173 } 1174 1175 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1176 struct se_device *dev, 1177 struct se_node_acl *nacl, 1178 struct se_session *sess) 1179 { 1180 struct se_portal_group *tpg = nacl->se_tpg; 1181 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1182 1183 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1184 memset(&buf[0], 0, PR_REG_ISID_LEN); 1185 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1186 PR_REG_ISID_LEN); 1187 isid_ptr = &buf[0]; 1188 } 1189 1190 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1191 } 1192 1193 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1194 { 1195 atomic_dec_mb(&pr_reg->pr_res_holders); 1196 } 1197 1198 static int core_scsi3_check_implicit_release( 1199 struct se_device *dev, 1200 struct t10_pr_registration *pr_reg) 1201 { 1202 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1203 struct t10_pr_registration *pr_res_holder; 1204 int ret = 0; 1205 1206 spin_lock(&dev->dev_reservation_lock); 1207 pr_res_holder = dev->dev_pr_res_holder; 1208 if (!pr_res_holder) { 1209 spin_unlock(&dev->dev_reservation_lock); 1210 return ret; 1211 } 1212 if (pr_res_holder == pr_reg) { 1213 /* 1214 * Perform an implicit RELEASE if the registration that 1215 * is being released is holding the reservation. 1216 * 1217 * From spc4r17, section 5.7.11.1: 1218 * 1219 * e) If the I_T nexus is the persistent reservation holder 1220 * and the persistent reservation is not an all registrants 1221 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1222 * service action or REGISTER AND IGNORE EXISTING KEY 1223 * service action with the SERVICE ACTION RESERVATION KEY 1224 * field set to zero (see 5.7.11.3). 1225 */ 1226 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1227 ret = 1; 1228 /* 1229 * For 'All Registrants' reservation types, all existing 1230 * registrations are still processed as reservation holders 1231 * in core_scsi3_pr_seq_non_holder() after the initial 1232 * reservation holder is implicitly released here. 1233 */ 1234 } else if (pr_reg->pr_reg_all_tg_pt && 1235 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1236 pr_reg->pr_reg_nacl->initiatorname)) && 1237 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1238 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1239 " UNREGISTER while existing reservation with matching" 1240 " key 0x%016Lx is present from another SCSI Initiator" 1241 " Port\n", pr_reg->pr_res_key); 1242 ret = -EPERM; 1243 } 1244 spin_unlock(&dev->dev_reservation_lock); 1245 1246 return ret; 1247 } 1248 1249 /* 1250 * Called with struct t10_reservation->registration_lock held. 1251 */ 1252 static void __core_scsi3_free_registration( 1253 struct se_device *dev, 1254 struct t10_pr_registration *pr_reg, 1255 struct list_head *preempt_and_abort_list, 1256 int dec_holders) 1257 __releases(&pr_tmpl->registration_lock) 1258 __acquires(&pr_tmpl->registration_lock) 1259 { 1260 const struct target_core_fabric_ops *tfo = 1261 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1262 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1263 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1264 struct se_dev_entry *deve; 1265 char i_buf[PR_REG_ISID_ID_LEN]; 1266 1267 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1268 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1269 1270 if (!list_empty(&pr_reg->pr_reg_list)) 1271 list_del(&pr_reg->pr_reg_list); 1272 /* 1273 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1274 * so call core_scsi3_put_pr_reg() to decrement our reference. 1275 */ 1276 if (dec_holders) 1277 core_scsi3_put_pr_reg(pr_reg); 1278 1279 spin_unlock(&pr_tmpl->registration_lock); 1280 /* 1281 * Wait until all reference from any other I_T nexuses for this 1282 * *pr_reg have been released. Because list_del() is called above, 1283 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1284 * count back to zero, and we release *pr_reg. 1285 */ 1286 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1287 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1288 tfo->get_fabric_name()); 1289 cpu_relax(); 1290 } 1291 1292 rcu_read_lock(); 1293 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1294 if (deve) 1295 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1296 rcu_read_unlock(); 1297 1298 spin_lock(&pr_tmpl->registration_lock); 1299 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1300 " Node: %s%s\n", tfo->get_fabric_name(), 1301 pr_reg->pr_reg_nacl->initiatorname, 1302 i_buf); 1303 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1304 " Port(s)\n", tfo->get_fabric_name(), 1305 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1306 dev->transport->name); 1307 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1308 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1309 pr_reg->pr_res_generation); 1310 1311 if (!preempt_and_abort_list) { 1312 pr_reg->pr_reg_deve = NULL; 1313 pr_reg->pr_reg_nacl = NULL; 1314 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1315 return; 1316 } 1317 /* 1318 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1319 * are released once the ABORT_TASK_SET has completed.. 1320 */ 1321 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1322 } 1323 1324 void core_scsi3_free_pr_reg_from_nacl( 1325 struct se_device *dev, 1326 struct se_node_acl *nacl) 1327 { 1328 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1329 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1330 bool free_reg = false; 1331 /* 1332 * If the passed se_node_acl matches the reservation holder, 1333 * release the reservation. 1334 */ 1335 spin_lock(&dev->dev_reservation_lock); 1336 pr_res_holder = dev->dev_pr_res_holder; 1337 if ((pr_res_holder != NULL) && 1338 (pr_res_holder->pr_reg_nacl == nacl)) { 1339 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1340 free_reg = true; 1341 } 1342 spin_unlock(&dev->dev_reservation_lock); 1343 /* 1344 * Release any registration associated with the struct se_node_acl. 1345 */ 1346 spin_lock(&pr_tmpl->registration_lock); 1347 if (pr_res_holder && free_reg) 1348 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1349 1350 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1351 &pr_tmpl->registration_list, pr_reg_list) { 1352 1353 if (pr_reg->pr_reg_nacl != nacl) 1354 continue; 1355 1356 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1357 } 1358 spin_unlock(&pr_tmpl->registration_lock); 1359 } 1360 1361 void core_scsi3_free_all_registrations( 1362 struct se_device *dev) 1363 { 1364 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1365 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1366 1367 spin_lock(&dev->dev_reservation_lock); 1368 pr_res_holder = dev->dev_pr_res_holder; 1369 if (pr_res_holder != NULL) { 1370 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1371 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1372 pr_res_holder, 0, 0); 1373 } 1374 spin_unlock(&dev->dev_reservation_lock); 1375 1376 spin_lock(&pr_tmpl->registration_lock); 1377 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1378 &pr_tmpl->registration_list, pr_reg_list) { 1379 1380 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1381 } 1382 spin_unlock(&pr_tmpl->registration_lock); 1383 1384 spin_lock(&pr_tmpl->aptpl_reg_lock); 1385 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1386 pr_reg_aptpl_list) { 1387 list_del(&pr_reg->pr_reg_aptpl_list); 1388 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1389 } 1390 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1391 } 1392 1393 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1394 { 1395 return target_depend_item(&tpg->tpg_group.cg_item); 1396 } 1397 1398 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1399 { 1400 target_undepend_item(&tpg->tpg_group.cg_item); 1401 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1402 } 1403 1404 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1405 { 1406 if (nacl->dynamic_node_acl) 1407 return 0; 1408 return target_depend_item(&nacl->acl_group.cg_item); 1409 } 1410 1411 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1412 { 1413 if (!nacl->dynamic_node_acl) 1414 target_undepend_item(&nacl->acl_group.cg_item); 1415 atomic_dec_mb(&nacl->acl_pr_ref_count); 1416 } 1417 1418 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1419 { 1420 struct se_lun_acl *lun_acl; 1421 struct se_node_acl *nacl; 1422 struct se_portal_group *tpg; 1423 /* 1424 * For nacl->dynamic_node_acl=1 1425 */ 1426 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1427 atomic_read(&se_deve->pr_kref.refcount) != 0); 1428 if (!lun_acl) 1429 return 0; 1430 1431 nacl = lun_acl->se_lun_nacl; 1432 tpg = nacl->se_tpg; 1433 1434 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1435 } 1436 1437 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1438 { 1439 struct se_lun_acl *lun_acl; 1440 struct se_node_acl *nacl; 1441 struct se_portal_group *tpg; 1442 /* 1443 * For nacl->dynamic_node_acl=1 1444 */ 1445 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1446 atomic_read(&se_deve->pr_kref.refcount) != 0); 1447 if (!lun_acl) { 1448 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1449 return; 1450 } 1451 nacl = lun_acl->se_lun_nacl; 1452 tpg = nacl->se_tpg; 1453 1454 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1455 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1456 } 1457 1458 static sense_reason_t 1459 core_scsi3_decode_spec_i_port( 1460 struct se_cmd *cmd, 1461 struct se_portal_group *tpg, 1462 unsigned char *l_isid, 1463 u64 sa_res_key, 1464 int all_tg_pt, 1465 int aptpl) 1466 { 1467 struct se_device *dev = cmd->se_dev; 1468 struct se_port *tmp_port; 1469 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1470 struct se_session *se_sess = cmd->se_sess; 1471 struct se_node_acl *dest_node_acl = NULL; 1472 struct se_dev_entry *dest_se_deve = NULL; 1473 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1474 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1475 LIST_HEAD(tid_dest_list); 1476 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1477 unsigned char *buf, *ptr, proto_ident; 1478 const unsigned char *i_str; 1479 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1480 sense_reason_t ret; 1481 u32 tpdl, tid_len = 0; 1482 u32 dest_rtpi = 0; 1483 1484 /* 1485 * Allocate a struct pr_transport_id_holder and setup the 1486 * local_node_acl pointer and add to struct list_head tid_dest_list 1487 * for add registration processing in the loop of tid_dest_list below. 1488 */ 1489 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1490 if (!tidh_new) { 1491 pr_err("Unable to allocate tidh_new\n"); 1492 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1493 } 1494 INIT_LIST_HEAD(&tidh_new->dest_list); 1495 tidh_new->dest_tpg = tpg; 1496 tidh_new->dest_node_acl = se_sess->se_node_acl; 1497 1498 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1499 se_sess->se_node_acl, cmd->se_lun, 1500 NULL, cmd->orig_fe_lun, l_isid, 1501 sa_res_key, all_tg_pt, aptpl); 1502 if (!local_pr_reg) { 1503 kfree(tidh_new); 1504 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1505 } 1506 tidh_new->dest_pr_reg = local_pr_reg; 1507 /* 1508 * The local I_T nexus does not hold any configfs dependances, 1509 * so we set tidh_new->dest_se_deve to NULL to prevent the 1510 * configfs_undepend_item() calls in the tid_dest_list loops below. 1511 */ 1512 tidh_new->dest_se_deve = NULL; 1513 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1514 1515 if (cmd->data_length < 28) { 1516 pr_warn("SPC-PR: Received PR OUT parameter list" 1517 " length too small: %u\n", cmd->data_length); 1518 ret = TCM_INVALID_PARAMETER_LIST; 1519 goto out; 1520 } 1521 1522 buf = transport_kmap_data_sg(cmd); 1523 if (!buf) { 1524 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1525 goto out; 1526 } 1527 1528 /* 1529 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1530 * first extract TransportID Parameter Data Length, and make sure 1531 * the value matches up to the SCSI expected data transfer length. 1532 */ 1533 tpdl = (buf[24] & 0xff) << 24; 1534 tpdl |= (buf[25] & 0xff) << 16; 1535 tpdl |= (buf[26] & 0xff) << 8; 1536 tpdl |= buf[27] & 0xff; 1537 1538 if ((tpdl + 28) != cmd->data_length) { 1539 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1540 " does not equal CDB data_length: %u\n", tpdl, 1541 cmd->data_length); 1542 ret = TCM_INVALID_PARAMETER_LIST; 1543 goto out_unmap; 1544 } 1545 /* 1546 * Start processing the received transport IDs using the 1547 * receiving I_T Nexus portal's fabric dependent methods to 1548 * obtain the SCSI Initiator Port/Device Identifiers. 1549 */ 1550 ptr = &buf[28]; 1551 1552 while (tpdl > 0) { 1553 struct se_lun *dest_lun; 1554 1555 proto_ident = (ptr[0] & 0x0f); 1556 dest_tpg = NULL; 1557 1558 spin_lock(&dev->se_port_lock); 1559 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1560 tmp_tpg = tmp_port->sep_tpg; 1561 if (!tmp_tpg) 1562 continue; 1563 1564 /* 1565 * Look for the matching proto_ident provided by 1566 * the received TransportID 1567 */ 1568 if (tmp_tpg->proto_id != proto_ident) 1569 continue; 1570 dest_rtpi = tmp_port->sep_rtpi; 1571 1572 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1573 (const char *)ptr, &tid_len, &iport_ptr); 1574 if (!i_str) 1575 continue; 1576 1577 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1578 spin_unlock(&dev->se_port_lock); 1579 1580 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1581 pr_err(" core_scsi3_tpg_depend_item()" 1582 " for tmp_tpg\n"); 1583 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1584 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1585 goto out_unmap; 1586 } 1587 /* 1588 * Locate the destination initiator ACL to be registered 1589 * from the decoded fabric module specific TransportID 1590 * at *i_str. 1591 */ 1592 mutex_lock(&tmp_tpg->acl_node_mutex); 1593 dest_node_acl = __core_tpg_get_initiator_node_acl( 1594 tmp_tpg, i_str); 1595 if (dest_node_acl) 1596 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1597 mutex_unlock(&tmp_tpg->acl_node_mutex); 1598 1599 if (!dest_node_acl) { 1600 core_scsi3_tpg_undepend_item(tmp_tpg); 1601 spin_lock(&dev->se_port_lock); 1602 continue; 1603 } 1604 1605 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1606 pr_err("configfs_depend_item() failed" 1607 " for dest_node_acl->acl_group\n"); 1608 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1609 core_scsi3_tpg_undepend_item(tmp_tpg); 1610 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1611 goto out_unmap; 1612 } 1613 1614 dest_tpg = tmp_tpg; 1615 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1616 " %s Port RTPI: %hu\n", 1617 dest_tpg->se_tpg_tfo->get_fabric_name(), 1618 dest_node_acl->initiatorname, dest_rtpi); 1619 1620 spin_lock(&dev->se_port_lock); 1621 break; 1622 } 1623 spin_unlock(&dev->se_port_lock); 1624 1625 if (!dest_tpg) { 1626 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1627 " dest_tpg\n"); 1628 ret = TCM_INVALID_PARAMETER_LIST; 1629 goto out_unmap; 1630 } 1631 1632 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1633 " tid_len: %d for %s + %s\n", 1634 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1635 tpdl, tid_len, i_str, iport_ptr); 1636 1637 if (tid_len > tpdl) { 1638 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1639 " %u for Transport ID: %s\n", tid_len, ptr); 1640 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1641 core_scsi3_tpg_undepend_item(dest_tpg); 1642 ret = TCM_INVALID_PARAMETER_LIST; 1643 goto out_unmap; 1644 } 1645 /* 1646 * Locate the desintation struct se_dev_entry pointer for matching 1647 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1648 * Target Port. 1649 */ 1650 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1651 dest_rtpi); 1652 if (!dest_se_deve) { 1653 pr_err("Unable to locate %s dest_se_deve" 1654 " from destination RTPI: %hu\n", 1655 dest_tpg->se_tpg_tfo->get_fabric_name(), 1656 dest_rtpi); 1657 1658 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1659 core_scsi3_tpg_undepend_item(dest_tpg); 1660 ret = TCM_INVALID_PARAMETER_LIST; 1661 goto out_unmap; 1662 } 1663 1664 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1665 pr_err("core_scsi3_lunacl_depend_item()" 1666 " failed\n"); 1667 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1668 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1669 core_scsi3_tpg_undepend_item(dest_tpg); 1670 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1671 goto out_unmap; 1672 } 1673 1674 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1675 " dest_se_deve mapped_lun: %u\n", 1676 dest_tpg->se_tpg_tfo->get_fabric_name(), 1677 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1678 1679 /* 1680 * Skip any TransportIDs that already have a registration for 1681 * this target port. 1682 */ 1683 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1684 iport_ptr); 1685 if (pr_reg_e) { 1686 core_scsi3_put_pr_reg(pr_reg_e); 1687 core_scsi3_lunacl_undepend_item(dest_se_deve); 1688 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1689 core_scsi3_tpg_undepend_item(dest_tpg); 1690 ptr += tid_len; 1691 tpdl -= tid_len; 1692 tid_len = 0; 1693 continue; 1694 } 1695 /* 1696 * Allocate a struct pr_transport_id_holder and setup 1697 * the dest_node_acl and dest_se_deve pointers for the 1698 * loop below. 1699 */ 1700 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1701 GFP_KERNEL); 1702 if (!tidh_new) { 1703 pr_err("Unable to allocate tidh_new\n"); 1704 core_scsi3_lunacl_undepend_item(dest_se_deve); 1705 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1706 core_scsi3_tpg_undepend_item(dest_tpg); 1707 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1708 goto out_unmap; 1709 } 1710 INIT_LIST_HEAD(&tidh_new->dest_list); 1711 tidh_new->dest_tpg = dest_tpg; 1712 tidh_new->dest_node_acl = dest_node_acl; 1713 tidh_new->dest_se_deve = dest_se_deve; 1714 1715 /* 1716 * Allocate, but do NOT add the registration for the 1717 * TransportID referenced SCSI Initiator port. This 1718 * done because of the following from spc4r17 in section 1719 * 6.14.3 wrt SPEC_I_PT: 1720 * 1721 * "If a registration fails for any initiator port (e.g., if th 1722 * logical unit does not have enough resources available to 1723 * hold the registration information), no registrations shall be 1724 * made, and the command shall be terminated with 1725 * CHECK CONDITION status." 1726 * 1727 * That means we call __core_scsi3_alloc_registration() here, 1728 * and then call __core_scsi3_add_registration() in the 1729 * 2nd loop which will never fail. 1730 */ 1731 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1732 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 1733 1734 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1735 dest_node_acl, dest_lun, dest_se_deve, 1736 dest_se_deve->mapped_lun, iport_ptr, 1737 sa_res_key, all_tg_pt, aptpl); 1738 if (!dest_pr_reg) { 1739 core_scsi3_lunacl_undepend_item(dest_se_deve); 1740 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1741 core_scsi3_tpg_undepend_item(dest_tpg); 1742 kfree(tidh_new); 1743 ret = TCM_INVALID_PARAMETER_LIST; 1744 goto out_unmap; 1745 } 1746 tidh_new->dest_pr_reg = dest_pr_reg; 1747 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1748 1749 ptr += tid_len; 1750 tpdl -= tid_len; 1751 tid_len = 0; 1752 1753 } 1754 1755 transport_kunmap_data_sg(cmd); 1756 1757 /* 1758 * Go ahead and create a registrations from tid_dest_list for the 1759 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1760 * and dest_se_deve. 1761 * 1762 * The SA Reservation Key from the PROUT is set for the 1763 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1764 * means that the TransportID Initiator port will be 1765 * registered on all of the target ports in the SCSI target device 1766 * ALL_TG_PT=0 means the registration will only be for the 1767 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1768 * was received. 1769 */ 1770 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1771 dest_tpg = tidh->dest_tpg; 1772 dest_node_acl = tidh->dest_node_acl; 1773 dest_se_deve = tidh->dest_se_deve; 1774 dest_pr_reg = tidh->dest_pr_reg; 1775 1776 list_del(&tidh->dest_list); 1777 kfree(tidh); 1778 1779 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1780 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1781 1782 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1783 dest_pr_reg, 0, 0); 1784 1785 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1786 " registered Transport ID for Node: %s%s Mapped LUN:" 1787 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1788 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1789 dest_se_deve->mapped_lun : 0); 1790 1791 if (!dest_se_deve) 1792 continue; 1793 1794 core_scsi3_lunacl_undepend_item(dest_se_deve); 1795 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1796 core_scsi3_tpg_undepend_item(dest_tpg); 1797 } 1798 1799 return 0; 1800 out_unmap: 1801 transport_kunmap_data_sg(cmd); 1802 out: 1803 /* 1804 * For the failure case, release everything from tid_dest_list 1805 * including *dest_pr_reg and the configfs dependances.. 1806 */ 1807 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1808 dest_tpg = tidh->dest_tpg; 1809 dest_node_acl = tidh->dest_node_acl; 1810 dest_se_deve = tidh->dest_se_deve; 1811 dest_pr_reg = tidh->dest_pr_reg; 1812 1813 list_del(&tidh->dest_list); 1814 kfree(tidh); 1815 /* 1816 * Release any extra ALL_TG_PT=1 registrations for 1817 * the SPEC_I_PT=1 case. 1818 */ 1819 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1820 &dest_pr_reg->pr_reg_atp_list, 1821 pr_reg_atp_mem_list) { 1822 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1823 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1824 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1825 } 1826 1827 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1828 1829 if (!dest_se_deve) 1830 continue; 1831 1832 core_scsi3_lunacl_undepend_item(dest_se_deve); 1833 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1834 core_scsi3_tpg_undepend_item(dest_tpg); 1835 } 1836 return ret; 1837 } 1838 1839 static int core_scsi3_update_aptpl_buf( 1840 struct se_device *dev, 1841 unsigned char *buf, 1842 u32 pr_aptpl_buf_len) 1843 { 1844 struct se_portal_group *tpg; 1845 struct t10_pr_registration *pr_reg; 1846 unsigned char tmp[512], isid_buf[32]; 1847 ssize_t len = 0; 1848 int reg_count = 0; 1849 int ret = 0; 1850 1851 spin_lock(&dev->dev_reservation_lock); 1852 spin_lock(&dev->t10_pr.registration_lock); 1853 /* 1854 * Walk the registration list.. 1855 */ 1856 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1857 pr_reg_list) { 1858 1859 tmp[0] = '\0'; 1860 isid_buf[0] = '\0'; 1861 tpg = pr_reg->pr_reg_nacl->se_tpg; 1862 /* 1863 * Write out any ISID value to APTPL metadata that was included 1864 * in the original registration. 1865 */ 1866 if (pr_reg->isid_present_at_reg) 1867 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1868 pr_reg->pr_reg_isid); 1869 /* 1870 * Include special metadata if the pr_reg matches the 1871 * reservation holder. 1872 */ 1873 if (dev->dev_pr_res_holder == pr_reg) { 1874 snprintf(tmp, 512, "PR_REG_START: %d" 1875 "\ninitiator_fabric=%s\n" 1876 "initiator_node=%s\n%s" 1877 "sa_res_key=%llu\n" 1878 "res_holder=1\nres_type=%02x\n" 1879 "res_scope=%02x\nres_all_tg_pt=%d\n" 1880 "mapped_lun=%u\n", reg_count, 1881 tpg->se_tpg_tfo->get_fabric_name(), 1882 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1883 pr_reg->pr_res_key, pr_reg->pr_res_type, 1884 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1885 pr_reg->pr_res_mapped_lun); 1886 } else { 1887 snprintf(tmp, 512, "PR_REG_START: %d\n" 1888 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1889 "sa_res_key=%llu\nres_holder=0\n" 1890 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1891 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1892 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1893 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1894 pr_reg->pr_res_mapped_lun); 1895 } 1896 1897 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1898 pr_err("Unable to update renaming APTPL metadata," 1899 " reallocating larger buffer\n"); 1900 ret = -EMSGSIZE; 1901 goto out; 1902 } 1903 len += sprintf(buf+len, "%s", tmp); 1904 1905 /* 1906 * Include information about the associated SCSI target port. 1907 */ 1908 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1909 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1910 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1911 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1912 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1913 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1914 reg_count); 1915 1916 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1917 pr_err("Unable to update renaming APTPL metadata," 1918 " reallocating larger buffer\n"); 1919 ret = -EMSGSIZE; 1920 goto out; 1921 } 1922 len += sprintf(buf+len, "%s", tmp); 1923 reg_count++; 1924 } 1925 1926 if (!reg_count) 1927 len += sprintf(buf+len, "No Registrations or Reservations"); 1928 1929 out: 1930 spin_unlock(&dev->t10_pr.registration_lock); 1931 spin_unlock(&dev->dev_reservation_lock); 1932 1933 return ret; 1934 } 1935 1936 static int __core_scsi3_write_aptpl_to_file( 1937 struct se_device *dev, 1938 unsigned char *buf) 1939 { 1940 struct t10_wwn *wwn = &dev->t10_wwn; 1941 struct file *file; 1942 int flags = O_RDWR | O_CREAT | O_TRUNC; 1943 char path[512]; 1944 u32 pr_aptpl_buf_len; 1945 int ret; 1946 1947 memset(path, 0, 512); 1948 1949 if (strlen(&wwn->unit_serial[0]) >= 512) { 1950 pr_err("WWN value for struct se_device does not fit" 1951 " into path buffer\n"); 1952 return -EMSGSIZE; 1953 } 1954 1955 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1956 file = filp_open(path, flags, 0600); 1957 if (IS_ERR(file)) { 1958 pr_err("filp_open(%s) for APTPL metadata" 1959 " failed\n", path); 1960 return PTR_ERR(file); 1961 } 1962 1963 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1964 1965 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1966 1967 if (ret < 0) 1968 pr_debug("Error writing APTPL metadata file: %s\n", path); 1969 fput(file); 1970 1971 return (ret < 0) ? -EIO : 0; 1972 } 1973 1974 /* 1975 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1976 * write out the updated metadata to struct file for this SCSI device. 1977 */ 1978 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1979 { 1980 unsigned char *buf; 1981 int rc, len = PR_APTPL_BUF_LEN; 1982 1983 if (!aptpl) { 1984 char *null_buf = "No Registrations or Reservations\n"; 1985 1986 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1987 dev->t10_pr.pr_aptpl_active = 0; 1988 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1989 1990 if (rc) 1991 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1992 1993 return 0; 1994 } 1995 retry: 1996 buf = vzalloc(len); 1997 if (!buf) 1998 return TCM_OUT_OF_RESOURCES; 1999 2000 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2001 if (rc < 0) { 2002 vfree(buf); 2003 len *= 2; 2004 goto retry; 2005 } 2006 2007 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2008 if (rc != 0) { 2009 pr_err("SPC-3 PR: Could not update APTPL\n"); 2010 vfree(buf); 2011 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2012 } 2013 dev->t10_pr.pr_aptpl_active = 1; 2014 vfree(buf); 2015 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2016 return 0; 2017 } 2018 2019 static sense_reason_t 2020 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2021 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2022 { 2023 struct se_session *se_sess = cmd->se_sess; 2024 struct se_device *dev = cmd->se_dev; 2025 struct se_lun *se_lun = cmd->se_lun; 2026 struct se_portal_group *se_tpg; 2027 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2028 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2029 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2030 sense_reason_t ret = TCM_NO_SENSE; 2031 int pr_holder = 0, type; 2032 2033 if (!se_sess || !se_lun) { 2034 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2035 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2036 } 2037 se_tpg = se_sess->se_tpg; 2038 2039 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2040 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2041 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2042 PR_REG_ISID_LEN); 2043 isid_ptr = &isid_buf[0]; 2044 } 2045 /* 2046 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2047 */ 2048 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2049 if (!pr_reg) { 2050 if (res_key) { 2051 pr_warn("SPC-3 PR: Reservation Key non-zero" 2052 " for SA REGISTER, returning CONFLICT\n"); 2053 return TCM_RESERVATION_CONFLICT; 2054 } 2055 /* 2056 * Do nothing but return GOOD status. 2057 */ 2058 if (!sa_res_key) 2059 return 0; 2060 2061 if (!spec_i_pt) { 2062 /* 2063 * Perform the Service Action REGISTER on the Initiator 2064 * Port Endpoint that the PRO was received from on the 2065 * Logical Unit of the SCSI device server. 2066 */ 2067 if (core_scsi3_alloc_registration(cmd->se_dev, 2068 se_sess->se_node_acl, cmd->se_lun, 2069 NULL, cmd->orig_fe_lun, isid_ptr, 2070 sa_res_key, all_tg_pt, aptpl, 2071 register_type, 0)) { 2072 pr_err("Unable to allocate" 2073 " struct t10_pr_registration\n"); 2074 return TCM_INVALID_PARAMETER_LIST; 2075 } 2076 } else { 2077 /* 2078 * Register both the Initiator port that received 2079 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2080 * TransportID from Parameter list and loop through 2081 * fabric dependent parameter list while calling 2082 * logic from of core_scsi3_alloc_registration() for 2083 * each TransportID provided SCSI Initiator Port/Device 2084 */ 2085 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2086 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2087 if (ret != 0) 2088 return ret; 2089 } 2090 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2091 } 2092 2093 /* ok, existing registration */ 2094 2095 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2096 pr_err("SPC-3 PR REGISTER: Received" 2097 " res_key: 0x%016Lx does not match" 2098 " existing SA REGISTER res_key:" 2099 " 0x%016Lx\n", res_key, 2100 pr_reg->pr_res_key); 2101 ret = TCM_RESERVATION_CONFLICT; 2102 goto out; 2103 } 2104 2105 if (spec_i_pt) { 2106 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2107 " set on a registered nexus\n"); 2108 ret = TCM_INVALID_PARAMETER_LIST; 2109 goto out; 2110 } 2111 2112 /* 2113 * An existing ALL_TG_PT=1 registration being released 2114 * must also set ALL_TG_PT=1 in the incoming PROUT. 2115 */ 2116 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2117 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2118 " registration exists, but ALL_TG_PT=1 bit not" 2119 " present in received PROUT\n"); 2120 ret = TCM_INVALID_CDB_FIELD; 2121 goto out; 2122 } 2123 2124 /* 2125 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2126 */ 2127 if (sa_res_key) { 2128 /* 2129 * Increment PRgeneration counter for struct se_device" 2130 * upon a successful REGISTER, see spc4r17 section 6.3.2 2131 * READ_KEYS service action. 2132 */ 2133 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2134 pr_reg->pr_res_key = sa_res_key; 2135 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2136 " Key for %s to: 0x%016Lx PRgeneration:" 2137 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2138 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2139 pr_reg->pr_reg_nacl->initiatorname, 2140 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2141 2142 } else { 2143 /* 2144 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2145 */ 2146 type = pr_reg->pr_res_type; 2147 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2148 pr_reg); 2149 if (pr_holder < 0) { 2150 ret = TCM_RESERVATION_CONFLICT; 2151 goto out; 2152 } 2153 2154 spin_lock(&pr_tmpl->registration_lock); 2155 /* 2156 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2157 * and matching pr_res_key. 2158 */ 2159 if (pr_reg->pr_reg_all_tg_pt) { 2160 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2161 &pr_tmpl->registration_list, 2162 pr_reg_list) { 2163 2164 if (!pr_reg_p->pr_reg_all_tg_pt) 2165 continue; 2166 if (pr_reg_p->pr_res_key != res_key) 2167 continue; 2168 if (pr_reg == pr_reg_p) 2169 continue; 2170 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2171 pr_reg_p->pr_reg_nacl->initiatorname)) 2172 continue; 2173 2174 __core_scsi3_free_registration(dev, 2175 pr_reg_p, NULL, 0); 2176 } 2177 } 2178 2179 /* 2180 * Release the calling I_T Nexus registration now.. 2181 */ 2182 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2183 pr_reg = NULL; 2184 2185 /* 2186 * From spc4r17, section 5.7.11.3 Unregistering 2187 * 2188 * If the persistent reservation is a registrants only 2189 * type, the device server shall establish a unit 2190 * attention condition for the initiator port associated 2191 * with every registered I_T nexus except for the I_T 2192 * nexus on which the PERSISTENT RESERVE OUT command was 2193 * received, with the additional sense code set to 2194 * RESERVATIONS RELEASED. 2195 */ 2196 if (pr_holder && 2197 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2198 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2199 list_for_each_entry(pr_reg_p, 2200 &pr_tmpl->registration_list, 2201 pr_reg_list) { 2202 2203 core_scsi3_ua_allocate( 2204 pr_reg_p->pr_reg_nacl, 2205 pr_reg_p->pr_res_mapped_lun, 2206 0x2A, 2207 ASCQ_2AH_RESERVATIONS_RELEASED); 2208 } 2209 } 2210 2211 spin_unlock(&pr_tmpl->registration_lock); 2212 } 2213 2214 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2215 2216 out: 2217 if (pr_reg) 2218 core_scsi3_put_pr_reg(pr_reg); 2219 return ret; 2220 } 2221 2222 unsigned char *core_scsi3_pr_dump_type(int type) 2223 { 2224 switch (type) { 2225 case PR_TYPE_WRITE_EXCLUSIVE: 2226 return "Write Exclusive Access"; 2227 case PR_TYPE_EXCLUSIVE_ACCESS: 2228 return "Exclusive Access"; 2229 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2230 return "Write Exclusive Access, Registrants Only"; 2231 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2232 return "Exclusive Access, Registrants Only"; 2233 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2234 return "Write Exclusive Access, All Registrants"; 2235 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2236 return "Exclusive Access, All Registrants"; 2237 default: 2238 break; 2239 } 2240 2241 return "Unknown SPC-3 PR Type"; 2242 } 2243 2244 static sense_reason_t 2245 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2246 { 2247 struct se_device *dev = cmd->se_dev; 2248 struct se_session *se_sess = cmd->se_sess; 2249 struct se_lun *se_lun = cmd->se_lun; 2250 struct t10_pr_registration *pr_reg, *pr_res_holder; 2251 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2252 char i_buf[PR_REG_ISID_ID_LEN]; 2253 sense_reason_t ret; 2254 2255 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2256 2257 if (!se_sess || !se_lun) { 2258 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2259 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2260 } 2261 /* 2262 * Locate the existing *pr_reg via struct se_node_acl pointers 2263 */ 2264 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2265 se_sess); 2266 if (!pr_reg) { 2267 pr_err("SPC-3 PR: Unable to locate" 2268 " PR_REGISTERED *pr_reg for RESERVE\n"); 2269 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2270 } 2271 /* 2272 * From spc4r17 Section 5.7.9: Reserving: 2273 * 2274 * An application client creates a persistent reservation by issuing 2275 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2276 * a registered I_T nexus with the following parameters: 2277 * a) RESERVATION KEY set to the value of the reservation key that is 2278 * registered with the logical unit for the I_T nexus; and 2279 */ 2280 if (res_key != pr_reg->pr_res_key) { 2281 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2282 " does not match existing SA REGISTER res_key:" 2283 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2284 ret = TCM_RESERVATION_CONFLICT; 2285 goto out_put_pr_reg; 2286 } 2287 /* 2288 * From spc4r17 Section 5.7.9: Reserving: 2289 * 2290 * From above: 2291 * b) TYPE field and SCOPE field set to the persistent reservation 2292 * being created. 2293 * 2294 * Only one persistent reservation is allowed at a time per logical unit 2295 * and that persistent reservation has a scope of LU_SCOPE. 2296 */ 2297 if (scope != PR_SCOPE_LU_SCOPE) { 2298 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2299 ret = TCM_INVALID_PARAMETER_LIST; 2300 goto out_put_pr_reg; 2301 } 2302 /* 2303 * See if we have an existing PR reservation holder pointer at 2304 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2305 * *pr_res_holder. 2306 */ 2307 spin_lock(&dev->dev_reservation_lock); 2308 pr_res_holder = dev->dev_pr_res_holder; 2309 if (pr_res_holder) { 2310 /* 2311 * From spc4r17 Section 5.7.9: Reserving: 2312 * 2313 * If the device server receives a PERSISTENT RESERVE OUT 2314 * command from an I_T nexus other than a persistent reservation 2315 * holder (see 5.7.10) that attempts to create a persistent 2316 * reservation when a persistent reservation already exists for 2317 * the logical unit, then the command shall be completed with 2318 * RESERVATION CONFLICT status. 2319 */ 2320 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2321 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2322 pr_err("SPC-3 PR: Attempted RESERVE from" 2323 " [%s]: %s while reservation already held by" 2324 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2325 cmd->se_tfo->get_fabric_name(), 2326 se_sess->se_node_acl->initiatorname, 2327 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2328 pr_res_holder->pr_reg_nacl->initiatorname); 2329 2330 spin_unlock(&dev->dev_reservation_lock); 2331 ret = TCM_RESERVATION_CONFLICT; 2332 goto out_put_pr_reg; 2333 } 2334 /* 2335 * From spc4r17 Section 5.7.9: Reserving: 2336 * 2337 * If a persistent reservation holder attempts to modify the 2338 * type or scope of an existing persistent reservation, the 2339 * command shall be completed with RESERVATION CONFLICT status. 2340 */ 2341 if ((pr_res_holder->pr_res_type != type) || 2342 (pr_res_holder->pr_res_scope != scope)) { 2343 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2344 pr_err("SPC-3 PR: Attempted RESERVE from" 2345 " [%s]: %s trying to change TYPE and/or SCOPE," 2346 " while reservation already held by [%s]: %s," 2347 " returning RESERVATION_CONFLICT\n", 2348 cmd->se_tfo->get_fabric_name(), 2349 se_sess->se_node_acl->initiatorname, 2350 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2351 pr_res_holder->pr_reg_nacl->initiatorname); 2352 2353 spin_unlock(&dev->dev_reservation_lock); 2354 ret = TCM_RESERVATION_CONFLICT; 2355 goto out_put_pr_reg; 2356 } 2357 /* 2358 * From spc4r17 Section 5.7.9: Reserving: 2359 * 2360 * If the device server receives a PERSISTENT RESERVE OUT 2361 * command with RESERVE service action where the TYPE field and 2362 * the SCOPE field contain the same values as the existing type 2363 * and scope from a persistent reservation holder, it shall not 2364 * make any change to the existing persistent reservation and 2365 * shall completethe command with GOOD status. 2366 */ 2367 spin_unlock(&dev->dev_reservation_lock); 2368 ret = 0; 2369 goto out_put_pr_reg; 2370 } 2371 /* 2372 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2373 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2374 */ 2375 pr_reg->pr_res_scope = scope; 2376 pr_reg->pr_res_type = type; 2377 pr_reg->pr_res_holder = 1; 2378 dev->dev_pr_res_holder = pr_reg; 2379 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2380 2381 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2382 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2383 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2384 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2385 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2386 cmd->se_tfo->get_fabric_name(), 2387 se_sess->se_node_acl->initiatorname, 2388 i_buf); 2389 spin_unlock(&dev->dev_reservation_lock); 2390 2391 if (pr_tmpl->pr_aptpl_active) 2392 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2393 2394 ret = 0; 2395 out_put_pr_reg: 2396 core_scsi3_put_pr_reg(pr_reg); 2397 return ret; 2398 } 2399 2400 static sense_reason_t 2401 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2402 u64 res_key) 2403 { 2404 switch (type) { 2405 case PR_TYPE_WRITE_EXCLUSIVE: 2406 case PR_TYPE_EXCLUSIVE_ACCESS: 2407 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2408 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2409 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2410 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2411 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2412 default: 2413 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2414 " 0x%02x\n", type); 2415 return TCM_INVALID_CDB_FIELD; 2416 } 2417 } 2418 2419 /* 2420 * Called with struct se_device->dev_reservation_lock held. 2421 */ 2422 static void __core_scsi3_complete_pro_release( 2423 struct se_device *dev, 2424 struct se_node_acl *se_nacl, 2425 struct t10_pr_registration *pr_reg, 2426 int explicit, 2427 int unreg) 2428 { 2429 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2430 char i_buf[PR_REG_ISID_ID_LEN]; 2431 int pr_res_type = 0, pr_res_scope = 0; 2432 2433 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2434 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2435 /* 2436 * Go ahead and release the current PR reservation holder. 2437 * If an All Registrants reservation is currently active and 2438 * a unregister operation is requested, replace the current 2439 * dev_pr_res_holder with another active registration. 2440 */ 2441 if (dev->dev_pr_res_holder) { 2442 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2443 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2444 dev->dev_pr_res_holder->pr_res_type = 0; 2445 dev->dev_pr_res_holder->pr_res_scope = 0; 2446 dev->dev_pr_res_holder->pr_res_holder = 0; 2447 dev->dev_pr_res_holder = NULL; 2448 } 2449 if (!unreg) 2450 goto out; 2451 2452 spin_lock(&dev->t10_pr.registration_lock); 2453 list_del_init(&pr_reg->pr_reg_list); 2454 /* 2455 * If the I_T nexus is a reservation holder, the persistent reservation 2456 * is of an all registrants type, and the I_T nexus is the last remaining 2457 * registered I_T nexus, then the device server shall also release the 2458 * persistent reservation. 2459 */ 2460 if (!list_empty(&dev->t10_pr.registration_list) && 2461 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2462 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2463 dev->dev_pr_res_holder = 2464 list_entry(dev->t10_pr.registration_list.next, 2465 struct t10_pr_registration, pr_reg_list); 2466 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2467 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2468 dev->dev_pr_res_holder->pr_res_holder = 1; 2469 } 2470 spin_unlock(&dev->t10_pr.registration_lock); 2471 out: 2472 if (!dev->dev_pr_res_holder) { 2473 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2474 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2475 tfo->get_fabric_name(), (explicit) ? "explicit" : 2476 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2477 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2478 } 2479 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2480 tfo->get_fabric_name(), se_nacl->initiatorname, 2481 i_buf); 2482 /* 2483 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2484 */ 2485 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2486 } 2487 2488 static sense_reason_t 2489 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2490 u64 res_key) 2491 { 2492 struct se_device *dev = cmd->se_dev; 2493 struct se_session *se_sess = cmd->se_sess; 2494 struct se_lun *se_lun = cmd->se_lun; 2495 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2496 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2497 sense_reason_t ret = 0; 2498 2499 if (!se_sess || !se_lun) { 2500 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2501 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2502 } 2503 /* 2504 * Locate the existing *pr_reg via struct se_node_acl pointers 2505 */ 2506 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2507 if (!pr_reg) { 2508 pr_err("SPC-3 PR: Unable to locate" 2509 " PR_REGISTERED *pr_reg for RELEASE\n"); 2510 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2511 } 2512 /* 2513 * From spc4r17 Section 5.7.11.2 Releasing: 2514 * 2515 * If there is no persistent reservation or in response to a persistent 2516 * reservation release request from a registered I_T nexus that is not a 2517 * persistent reservation holder (see 5.7.10), the device server shall 2518 * do the following: 2519 * 2520 * a) Not release the persistent reservation, if any; 2521 * b) Not remove any registrations; and 2522 * c) Complete the command with GOOD status. 2523 */ 2524 spin_lock(&dev->dev_reservation_lock); 2525 pr_res_holder = dev->dev_pr_res_holder; 2526 if (!pr_res_holder) { 2527 /* 2528 * No persistent reservation, return GOOD status. 2529 */ 2530 spin_unlock(&dev->dev_reservation_lock); 2531 goto out_put_pr_reg; 2532 } 2533 2534 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2535 /* 2536 * Release request from a registered I_T nexus that is not a 2537 * persistent reservation holder. return GOOD status. 2538 */ 2539 spin_unlock(&dev->dev_reservation_lock); 2540 goto out_put_pr_reg; 2541 } 2542 2543 /* 2544 * From spc4r17 Section 5.7.11.2 Releasing: 2545 * 2546 * Only the persistent reservation holder (see 5.7.10) is allowed to 2547 * release a persistent reservation. 2548 * 2549 * An application client releases the persistent reservation by issuing 2550 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2551 * an I_T nexus that is a persistent reservation holder with the 2552 * following parameters: 2553 * 2554 * a) RESERVATION KEY field set to the value of the reservation key 2555 * that is registered with the logical unit for the I_T nexus; 2556 */ 2557 if (res_key != pr_reg->pr_res_key) { 2558 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2559 " does not match existing SA REGISTER res_key:" 2560 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2561 spin_unlock(&dev->dev_reservation_lock); 2562 ret = TCM_RESERVATION_CONFLICT; 2563 goto out_put_pr_reg; 2564 } 2565 /* 2566 * From spc4r17 Section 5.7.11.2 Releasing and above: 2567 * 2568 * b) TYPE field and SCOPE field set to match the persistent 2569 * reservation being released. 2570 */ 2571 if ((pr_res_holder->pr_res_type != type) || 2572 (pr_res_holder->pr_res_scope != scope)) { 2573 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2574 pr_err("SPC-3 PR RELEASE: Attempted to release" 2575 " reservation from [%s]: %s with different TYPE " 2576 "and/or SCOPE while reservation already held by" 2577 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2578 cmd->se_tfo->get_fabric_name(), 2579 se_sess->se_node_acl->initiatorname, 2580 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2581 pr_res_holder->pr_reg_nacl->initiatorname); 2582 2583 spin_unlock(&dev->dev_reservation_lock); 2584 ret = TCM_RESERVATION_CONFLICT; 2585 goto out_put_pr_reg; 2586 } 2587 /* 2588 * In response to a persistent reservation release request from the 2589 * persistent reservation holder the device server shall perform a 2590 * release by doing the following as an uninterrupted series of actions: 2591 * a) Release the persistent reservation; 2592 * b) Not remove any registration(s); 2593 * c) If the released persistent reservation is a registrants only type 2594 * or all registrants type persistent reservation, 2595 * the device server shall establish a unit attention condition for 2596 * the initiator port associated with every regis- 2597 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2598 * RESERVE OUT command with RELEASE service action was received, 2599 * with the additional sense code set to RESERVATIONS RELEASED; and 2600 * d) If the persistent reservation is of any other type, the device 2601 * server shall not establish a unit attention condition. 2602 */ 2603 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2604 pr_reg, 1, 0); 2605 2606 spin_unlock(&dev->dev_reservation_lock); 2607 2608 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2609 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2610 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2611 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2612 /* 2613 * If no UNIT ATTENTION conditions will be established for 2614 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2615 * go ahead and check for APTPL=1 update+write below 2616 */ 2617 goto write_aptpl; 2618 } 2619 2620 spin_lock(&pr_tmpl->registration_lock); 2621 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2622 pr_reg_list) { 2623 /* 2624 * Do not establish a UNIT ATTENTION condition 2625 * for the calling I_T Nexus 2626 */ 2627 if (pr_reg_p == pr_reg) 2628 continue; 2629 2630 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2631 pr_reg_p->pr_res_mapped_lun, 2632 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2633 } 2634 spin_unlock(&pr_tmpl->registration_lock); 2635 2636 write_aptpl: 2637 if (pr_tmpl->pr_aptpl_active) 2638 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2639 2640 out_put_pr_reg: 2641 core_scsi3_put_pr_reg(pr_reg); 2642 return ret; 2643 } 2644 2645 static sense_reason_t 2646 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2647 { 2648 struct se_device *dev = cmd->se_dev; 2649 struct se_node_acl *pr_reg_nacl; 2650 struct se_session *se_sess = cmd->se_sess; 2651 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2652 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2653 u32 pr_res_mapped_lun = 0; 2654 int calling_it_nexus = 0; 2655 /* 2656 * Locate the existing *pr_reg via struct se_node_acl pointers 2657 */ 2658 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2659 se_sess->se_node_acl, se_sess); 2660 if (!pr_reg_n) { 2661 pr_err("SPC-3 PR: Unable to locate" 2662 " PR_REGISTERED *pr_reg for CLEAR\n"); 2663 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2664 } 2665 /* 2666 * From spc4r17 section 5.7.11.6, Clearing: 2667 * 2668 * Any application client may release the persistent reservation and 2669 * remove all registrations from a device server by issuing a 2670 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2671 * registered I_T nexus with the following parameter: 2672 * 2673 * a) RESERVATION KEY field set to the value of the reservation key 2674 * that is registered with the logical unit for the I_T nexus. 2675 */ 2676 if (res_key != pr_reg_n->pr_res_key) { 2677 pr_err("SPC-3 PR REGISTER: Received" 2678 " res_key: 0x%016Lx does not match" 2679 " existing SA REGISTER res_key:" 2680 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2681 core_scsi3_put_pr_reg(pr_reg_n); 2682 return TCM_RESERVATION_CONFLICT; 2683 } 2684 /* 2685 * a) Release the persistent reservation, if any; 2686 */ 2687 spin_lock(&dev->dev_reservation_lock); 2688 pr_res_holder = dev->dev_pr_res_holder; 2689 if (pr_res_holder) { 2690 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2691 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2692 pr_res_holder, 0, 0); 2693 } 2694 spin_unlock(&dev->dev_reservation_lock); 2695 /* 2696 * b) Remove all registration(s) (see spc4r17 5.7.7); 2697 */ 2698 spin_lock(&pr_tmpl->registration_lock); 2699 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2700 &pr_tmpl->registration_list, pr_reg_list) { 2701 2702 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2703 pr_reg_nacl = pr_reg->pr_reg_nacl; 2704 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2705 __core_scsi3_free_registration(dev, pr_reg, NULL, 2706 calling_it_nexus); 2707 /* 2708 * e) Establish a unit attention condition for the initiator 2709 * port associated with every registered I_T nexus other 2710 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2711 * command with CLEAR service action was received, with the 2712 * additional sense code set to RESERVATIONS PREEMPTED. 2713 */ 2714 if (!calling_it_nexus) 2715 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2716 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2717 } 2718 spin_unlock(&pr_tmpl->registration_lock); 2719 2720 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2721 cmd->se_tfo->get_fabric_name()); 2722 2723 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2724 2725 core_scsi3_pr_generation(dev); 2726 return 0; 2727 } 2728 2729 /* 2730 * Called with struct se_device->dev_reservation_lock held. 2731 */ 2732 static void __core_scsi3_complete_pro_preempt( 2733 struct se_device *dev, 2734 struct t10_pr_registration *pr_reg, 2735 struct list_head *preempt_and_abort_list, 2736 int type, 2737 int scope, 2738 enum preempt_type preempt_type) 2739 { 2740 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2741 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2742 char i_buf[PR_REG_ISID_ID_LEN]; 2743 2744 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2745 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2746 /* 2747 * Do an implicit RELEASE of the existing reservation. 2748 */ 2749 if (dev->dev_pr_res_holder) 2750 __core_scsi3_complete_pro_release(dev, nacl, 2751 dev->dev_pr_res_holder, 0, 0); 2752 2753 dev->dev_pr_res_holder = pr_reg; 2754 pr_reg->pr_res_holder = 1; 2755 pr_reg->pr_res_type = type; 2756 pr_reg->pr_res_scope = scope; 2757 2758 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2759 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2760 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2761 core_scsi3_pr_dump_type(type), 2762 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2763 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2764 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2765 nacl->initiatorname, i_buf); 2766 /* 2767 * For PREEMPT_AND_ABORT, add the preempting reservation's 2768 * struct t10_pr_registration to the list that will be compared 2769 * against received CDBs.. 2770 */ 2771 if (preempt_and_abort_list) 2772 list_add_tail(&pr_reg->pr_reg_abort_list, 2773 preempt_and_abort_list); 2774 } 2775 2776 static void core_scsi3_release_preempt_and_abort( 2777 struct list_head *preempt_and_abort_list, 2778 struct t10_pr_registration *pr_reg_holder) 2779 { 2780 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2781 2782 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2783 pr_reg_abort_list) { 2784 2785 list_del(&pr_reg->pr_reg_abort_list); 2786 if (pr_reg_holder == pr_reg) 2787 continue; 2788 if (pr_reg->pr_res_holder) { 2789 pr_warn("pr_reg->pr_res_holder still set\n"); 2790 continue; 2791 } 2792 2793 pr_reg->pr_reg_deve = NULL; 2794 pr_reg->pr_reg_nacl = NULL; 2795 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2796 } 2797 } 2798 2799 static sense_reason_t 2800 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2801 u64 sa_res_key, enum preempt_type preempt_type) 2802 { 2803 struct se_device *dev = cmd->se_dev; 2804 struct se_node_acl *pr_reg_nacl; 2805 struct se_session *se_sess = cmd->se_sess; 2806 LIST_HEAD(preempt_and_abort_list); 2807 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2808 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2809 u32 pr_res_mapped_lun = 0; 2810 int all_reg = 0, calling_it_nexus = 0; 2811 bool sa_res_key_unmatched = sa_res_key != 0; 2812 int prh_type = 0, prh_scope = 0; 2813 2814 if (!se_sess) 2815 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2816 2817 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2818 se_sess); 2819 if (!pr_reg_n) { 2820 pr_err("SPC-3 PR: Unable to locate" 2821 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2822 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2823 return TCM_RESERVATION_CONFLICT; 2824 } 2825 if (pr_reg_n->pr_res_key != res_key) { 2826 core_scsi3_put_pr_reg(pr_reg_n); 2827 return TCM_RESERVATION_CONFLICT; 2828 } 2829 if (scope != PR_SCOPE_LU_SCOPE) { 2830 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2831 core_scsi3_put_pr_reg(pr_reg_n); 2832 return TCM_INVALID_PARAMETER_LIST; 2833 } 2834 2835 spin_lock(&dev->dev_reservation_lock); 2836 pr_res_holder = dev->dev_pr_res_holder; 2837 if (pr_res_holder && 2838 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2839 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2840 all_reg = 1; 2841 2842 if (!all_reg && !sa_res_key) { 2843 spin_unlock(&dev->dev_reservation_lock); 2844 core_scsi3_put_pr_reg(pr_reg_n); 2845 return TCM_INVALID_PARAMETER_LIST; 2846 } 2847 /* 2848 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2849 * 2850 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2851 * persistent reservation holder or there is no persistent reservation 2852 * holder (i.e., there is no persistent reservation), then the device 2853 * server shall perform a preempt by doing the following in an 2854 * uninterrupted series of actions. (See below..) 2855 */ 2856 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2857 /* 2858 * No existing or SA Reservation Key matching reservations.. 2859 * 2860 * PROUT SA PREEMPT with All Registrant type reservations are 2861 * allowed to be processed without a matching SA Reservation Key 2862 */ 2863 spin_lock(&pr_tmpl->registration_lock); 2864 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2865 &pr_tmpl->registration_list, pr_reg_list) { 2866 /* 2867 * Removing of registrations in non all registrants 2868 * type reservations without a matching SA reservation 2869 * key. 2870 * 2871 * a) Remove the registrations for all I_T nexuses 2872 * specified by the SERVICE ACTION RESERVATION KEY 2873 * field; 2874 * b) Ignore the contents of the SCOPE and TYPE fields; 2875 * c) Process tasks as defined in 5.7.1; and 2876 * d) Establish a unit attention condition for the 2877 * initiator port associated with every I_T nexus 2878 * that lost its registration other than the I_T 2879 * nexus on which the PERSISTENT RESERVE OUT command 2880 * was received, with the additional sense code set 2881 * to REGISTRATIONS PREEMPTED. 2882 */ 2883 if (!all_reg) { 2884 if (pr_reg->pr_res_key != sa_res_key) 2885 continue; 2886 sa_res_key_unmatched = false; 2887 2888 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2889 pr_reg_nacl = pr_reg->pr_reg_nacl; 2890 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2891 __core_scsi3_free_registration(dev, pr_reg, 2892 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2893 NULL, calling_it_nexus); 2894 } else { 2895 /* 2896 * Case for any existing all registrants type 2897 * reservation, follow logic in spc4r17 section 2898 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2899 * 2900 * For a ZERO SA Reservation key, release 2901 * all other registrations and do an implicit 2902 * release of active persistent reservation. 2903 * 2904 * For a non-ZERO SA Reservation key, only 2905 * release the matching reservation key from 2906 * registrations. 2907 */ 2908 if ((sa_res_key) && 2909 (pr_reg->pr_res_key != sa_res_key)) 2910 continue; 2911 sa_res_key_unmatched = false; 2912 2913 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2914 if (calling_it_nexus) 2915 continue; 2916 2917 pr_reg_nacl = pr_reg->pr_reg_nacl; 2918 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2919 __core_scsi3_free_registration(dev, pr_reg, 2920 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2921 NULL, 0); 2922 } 2923 if (!calling_it_nexus) 2924 core_scsi3_ua_allocate(pr_reg_nacl, 2925 pr_res_mapped_lun, 0x2A, 2926 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2927 } 2928 spin_unlock(&pr_tmpl->registration_lock); 2929 /* 2930 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2931 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2932 * RESERVATION KEY field to a value that does not match any 2933 * registered reservation key, then the device server shall 2934 * complete the command with RESERVATION CONFLICT status. 2935 */ 2936 if (sa_res_key_unmatched) { 2937 spin_unlock(&dev->dev_reservation_lock); 2938 core_scsi3_put_pr_reg(pr_reg_n); 2939 return TCM_RESERVATION_CONFLICT; 2940 } 2941 /* 2942 * For an existing all registrants type reservation 2943 * with a zero SA rservation key, preempt the existing 2944 * reservation with the new PR type and scope. 2945 */ 2946 if (pr_res_holder && all_reg && !(sa_res_key)) { 2947 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2948 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2949 type, scope, preempt_type); 2950 2951 if (preempt_type == PREEMPT_AND_ABORT) 2952 core_scsi3_release_preempt_and_abort( 2953 &preempt_and_abort_list, pr_reg_n); 2954 } 2955 spin_unlock(&dev->dev_reservation_lock); 2956 2957 if (pr_tmpl->pr_aptpl_active) 2958 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2959 2960 core_scsi3_put_pr_reg(pr_reg_n); 2961 core_scsi3_pr_generation(cmd->se_dev); 2962 return 0; 2963 } 2964 /* 2965 * The PREEMPTing SA reservation key matches that of the 2966 * existing persistent reservation, first, we check if 2967 * we are preempting our own reservation. 2968 * From spc4r17, section 5.7.11.4.3 Preempting 2969 * persistent reservations and registration handling 2970 * 2971 * If an all registrants persistent reservation is not 2972 * present, it is not an error for the persistent 2973 * reservation holder to preempt itself (i.e., a 2974 * PERSISTENT RESERVE OUT with a PREEMPT service action 2975 * or a PREEMPT AND ABORT service action with the 2976 * SERVICE ACTION RESERVATION KEY value equal to the 2977 * persistent reservation holder's reservation key that 2978 * is received from the persistent reservation holder). 2979 * In that case, the device server shall establish the 2980 * new persistent reservation and maintain the 2981 * registration. 2982 */ 2983 prh_type = pr_res_holder->pr_res_type; 2984 prh_scope = pr_res_holder->pr_res_scope; 2985 /* 2986 * If the SERVICE ACTION RESERVATION KEY field identifies a 2987 * persistent reservation holder (see 5.7.10), the device 2988 * server shall perform a preempt by doing the following as 2989 * an uninterrupted series of actions: 2990 * 2991 * a) Release the persistent reservation for the holder 2992 * identified by the SERVICE ACTION RESERVATION KEY field; 2993 */ 2994 if (pr_reg_n != pr_res_holder) 2995 __core_scsi3_complete_pro_release(dev, 2996 pr_res_holder->pr_reg_nacl, 2997 dev->dev_pr_res_holder, 0, 0); 2998 /* 2999 * b) Remove the registrations for all I_T nexuses identified 3000 * by the SERVICE ACTION RESERVATION KEY field, except the 3001 * I_T nexus that is being used for the PERSISTENT RESERVE 3002 * OUT command. If an all registrants persistent reservation 3003 * is present and the SERVICE ACTION RESERVATION KEY field 3004 * is set to zero, then all registrations shall be removed 3005 * except for that of the I_T nexus that is being used for 3006 * the PERSISTENT RESERVE OUT command; 3007 */ 3008 spin_lock(&pr_tmpl->registration_lock); 3009 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3010 &pr_tmpl->registration_list, pr_reg_list) { 3011 3012 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3013 if (calling_it_nexus) 3014 continue; 3015 3016 if (pr_reg->pr_res_key != sa_res_key) 3017 continue; 3018 3019 pr_reg_nacl = pr_reg->pr_reg_nacl; 3020 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3021 __core_scsi3_free_registration(dev, pr_reg, 3022 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3023 calling_it_nexus); 3024 /* 3025 * e) Establish a unit attention condition for the initiator 3026 * port associated with every I_T nexus that lost its 3027 * persistent reservation and/or registration, with the 3028 * additional sense code set to REGISTRATIONS PREEMPTED; 3029 */ 3030 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3031 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3032 } 3033 spin_unlock(&pr_tmpl->registration_lock); 3034 /* 3035 * c) Establish a persistent reservation for the preempting 3036 * I_T nexus using the contents of the SCOPE and TYPE fields; 3037 */ 3038 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3039 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3040 type, scope, preempt_type); 3041 /* 3042 * d) Process tasks as defined in 5.7.1; 3043 * e) See above.. 3044 * f) If the type or scope has changed, then for every I_T nexus 3045 * whose reservation key was not removed, except for the I_T 3046 * nexus on which the PERSISTENT RESERVE OUT command was 3047 * received, the device server shall establish a unit 3048 * attention condition for the initiator port associated with 3049 * that I_T nexus, with the additional sense code set to 3050 * RESERVATIONS RELEASED. If the type or scope have not 3051 * changed, then no unit attention condition(s) shall be 3052 * established for this reason. 3053 */ 3054 if ((prh_type != type) || (prh_scope != scope)) { 3055 spin_lock(&pr_tmpl->registration_lock); 3056 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3057 &pr_tmpl->registration_list, pr_reg_list) { 3058 3059 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3060 if (calling_it_nexus) 3061 continue; 3062 3063 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3064 pr_reg->pr_res_mapped_lun, 0x2A, 3065 ASCQ_2AH_RESERVATIONS_RELEASED); 3066 } 3067 spin_unlock(&pr_tmpl->registration_lock); 3068 } 3069 spin_unlock(&dev->dev_reservation_lock); 3070 /* 3071 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3072 * All received CDBs for the matching existing reservation and 3073 * registrations undergo ABORT_TASK logic. 3074 * 3075 * From there, core_scsi3_release_preempt_and_abort() will 3076 * release every registration in the list (which have already 3077 * been removed from the primary pr_reg list), except the 3078 * new persistent reservation holder, the calling Initiator Port. 3079 */ 3080 if (preempt_type == PREEMPT_AND_ABORT) { 3081 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3082 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3083 pr_reg_n); 3084 } 3085 3086 if (pr_tmpl->pr_aptpl_active) 3087 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3088 3089 core_scsi3_put_pr_reg(pr_reg_n); 3090 core_scsi3_pr_generation(cmd->se_dev); 3091 return 0; 3092 } 3093 3094 static sense_reason_t 3095 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3096 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3097 { 3098 switch (type) { 3099 case PR_TYPE_WRITE_EXCLUSIVE: 3100 case PR_TYPE_EXCLUSIVE_ACCESS: 3101 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3102 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3103 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3104 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3105 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3106 sa_res_key, preempt_type); 3107 default: 3108 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3109 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3110 return TCM_INVALID_CDB_FIELD; 3111 } 3112 } 3113 3114 3115 static sense_reason_t 3116 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3117 u64 sa_res_key, int aptpl, int unreg) 3118 { 3119 struct se_session *se_sess = cmd->se_sess; 3120 struct se_device *dev = cmd->se_dev; 3121 struct se_dev_entry *dest_se_deve = NULL; 3122 struct se_lun *se_lun = cmd->se_lun; 3123 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3124 struct se_port *se_port; 3125 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3126 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3127 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3128 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3129 unsigned char *buf; 3130 const unsigned char *initiator_str; 3131 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3132 u32 tid_len, tmp_tid_len; 3133 int new_reg = 0, type, scope, matching_iname; 3134 sense_reason_t ret; 3135 unsigned short rtpi; 3136 unsigned char proto_ident; 3137 3138 if (!se_sess || !se_lun) { 3139 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3140 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3141 } 3142 3143 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3144 se_tpg = se_sess->se_tpg; 3145 tf_ops = se_tpg->se_tpg_tfo; 3146 /* 3147 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3148 * Register behaviors for a REGISTER AND MOVE service action 3149 * 3150 * Locate the existing *pr_reg via struct se_node_acl pointers 3151 */ 3152 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3153 se_sess); 3154 if (!pr_reg) { 3155 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3156 " *pr_reg for REGISTER_AND_MOVE\n"); 3157 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3158 } 3159 /* 3160 * The provided reservation key much match the existing reservation key 3161 * provided during this initiator's I_T nexus registration. 3162 */ 3163 if (res_key != pr_reg->pr_res_key) { 3164 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3165 " res_key: 0x%016Lx does not match existing SA REGISTER" 3166 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3167 ret = TCM_RESERVATION_CONFLICT; 3168 goto out_put_pr_reg; 3169 } 3170 /* 3171 * The service active reservation key needs to be non zero 3172 */ 3173 if (!sa_res_key) { 3174 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3175 " sa_res_key\n"); 3176 ret = TCM_INVALID_PARAMETER_LIST; 3177 goto out_put_pr_reg; 3178 } 3179 3180 /* 3181 * Determine the Relative Target Port Identifier where the reservation 3182 * will be moved to for the TransportID containing SCSI initiator WWN 3183 * information. 3184 */ 3185 buf = transport_kmap_data_sg(cmd); 3186 if (!buf) { 3187 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3188 goto out_put_pr_reg; 3189 } 3190 3191 rtpi = (buf[18] & 0xff) << 8; 3192 rtpi |= buf[19] & 0xff; 3193 tid_len = (buf[20] & 0xff) << 24; 3194 tid_len |= (buf[21] & 0xff) << 16; 3195 tid_len |= (buf[22] & 0xff) << 8; 3196 tid_len |= buf[23] & 0xff; 3197 transport_kunmap_data_sg(cmd); 3198 buf = NULL; 3199 3200 if ((tid_len + 24) != cmd->data_length) { 3201 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3202 " does not equal CDB data_length: %u\n", tid_len, 3203 cmd->data_length); 3204 ret = TCM_INVALID_PARAMETER_LIST; 3205 goto out_put_pr_reg; 3206 } 3207 3208 spin_lock(&dev->se_port_lock); 3209 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3210 if (se_port->sep_rtpi != rtpi) 3211 continue; 3212 dest_se_tpg = se_port->sep_tpg; 3213 if (!dest_se_tpg) 3214 continue; 3215 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3216 if (!dest_tf_ops) 3217 continue; 3218 3219 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3220 spin_unlock(&dev->se_port_lock); 3221 3222 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3223 pr_err("core_scsi3_tpg_depend_item() failed" 3224 " for dest_se_tpg\n"); 3225 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3226 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3227 goto out_put_pr_reg; 3228 } 3229 3230 spin_lock(&dev->se_port_lock); 3231 break; 3232 } 3233 spin_unlock(&dev->se_port_lock); 3234 3235 if (!dest_se_tpg || !dest_tf_ops) { 3236 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3237 " fabric ops from Relative Target Port Identifier:" 3238 " %hu\n", rtpi); 3239 ret = TCM_INVALID_PARAMETER_LIST; 3240 goto out_put_pr_reg; 3241 } 3242 3243 buf = transport_kmap_data_sg(cmd); 3244 if (!buf) { 3245 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3246 goto out_put_pr_reg; 3247 } 3248 proto_ident = (buf[24] & 0x0f); 3249 3250 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3251 " 0x%02x\n", proto_ident); 3252 3253 if (proto_ident != dest_se_tpg->proto_id) { 3254 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3255 " proto_ident: 0x%02x does not match ident: 0x%02x" 3256 " from fabric: %s\n", proto_ident, 3257 dest_se_tpg->proto_id, 3258 dest_tf_ops->get_fabric_name()); 3259 ret = TCM_INVALID_PARAMETER_LIST; 3260 goto out; 3261 } 3262 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3263 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3264 if (!initiator_str) { 3265 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3266 " initiator_str from Transport ID\n"); 3267 ret = TCM_INVALID_PARAMETER_LIST; 3268 goto out; 3269 } 3270 3271 transport_kunmap_data_sg(cmd); 3272 buf = NULL; 3273 3274 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3275 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3276 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3277 iport_ptr : ""); 3278 /* 3279 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3280 * action specifies a TransportID that is the same as the initiator port 3281 * of the I_T nexus for the command received, then the command shall 3282 * be terminated with CHECK CONDITION status, with the sense key set to 3283 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3284 * IN PARAMETER LIST. 3285 */ 3286 pr_reg_nacl = pr_reg->pr_reg_nacl; 3287 matching_iname = (!strcmp(initiator_str, 3288 pr_reg_nacl->initiatorname)) ? 1 : 0; 3289 if (!matching_iname) 3290 goto after_iport_check; 3291 3292 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3293 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3294 " matches: %s on received I_T Nexus\n", initiator_str, 3295 pr_reg_nacl->initiatorname); 3296 ret = TCM_INVALID_PARAMETER_LIST; 3297 goto out; 3298 } 3299 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3300 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3301 " matches: %s %s on received I_T Nexus\n", 3302 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3303 pr_reg->pr_reg_isid); 3304 ret = TCM_INVALID_PARAMETER_LIST; 3305 goto out; 3306 } 3307 after_iport_check: 3308 /* 3309 * Locate the destination struct se_node_acl from the received Transport ID 3310 */ 3311 mutex_lock(&dest_se_tpg->acl_node_mutex); 3312 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3313 initiator_str); 3314 if (dest_node_acl) 3315 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3316 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3317 3318 if (!dest_node_acl) { 3319 pr_err("Unable to locate %s dest_node_acl for" 3320 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3321 initiator_str); 3322 ret = TCM_INVALID_PARAMETER_LIST; 3323 goto out; 3324 } 3325 3326 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3327 pr_err("core_scsi3_nodeacl_depend_item() for" 3328 " dest_node_acl\n"); 3329 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3330 dest_node_acl = NULL; 3331 ret = TCM_INVALID_PARAMETER_LIST; 3332 goto out; 3333 } 3334 3335 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3336 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3337 dest_node_acl->initiatorname); 3338 3339 /* 3340 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3341 * PORT IDENTIFIER. 3342 */ 3343 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3344 if (!dest_se_deve) { 3345 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3346 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3347 ret = TCM_INVALID_PARAMETER_LIST; 3348 goto out; 3349 } 3350 3351 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3352 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3353 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3354 dest_se_deve = NULL; 3355 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3356 goto out; 3357 } 3358 3359 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3360 " ACL for dest_se_deve->mapped_lun: %u\n", 3361 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3362 dest_se_deve->mapped_lun); 3363 3364 /* 3365 * A persistent reservation needs to already existing in order to 3366 * successfully complete the REGISTER_AND_MOVE service action.. 3367 */ 3368 spin_lock(&dev->dev_reservation_lock); 3369 pr_res_holder = dev->dev_pr_res_holder; 3370 if (!pr_res_holder) { 3371 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3372 " currently held\n"); 3373 spin_unlock(&dev->dev_reservation_lock); 3374 ret = TCM_INVALID_CDB_FIELD; 3375 goto out; 3376 } 3377 /* 3378 * The received on I_T Nexus must be the reservation holder. 3379 * 3380 * From spc4r17 section 5.7.8 Table 50 -- 3381 * Register behaviors for a REGISTER AND MOVE service action 3382 */ 3383 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3384 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3385 " Nexus is not reservation holder\n"); 3386 spin_unlock(&dev->dev_reservation_lock); 3387 ret = TCM_RESERVATION_CONFLICT; 3388 goto out; 3389 } 3390 /* 3391 * From spc4r17 section 5.7.8: registering and moving reservation 3392 * 3393 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3394 * action is received and the established persistent reservation is a 3395 * Write Exclusive - All Registrants type or Exclusive Access - 3396 * All Registrants type reservation, then the command shall be completed 3397 * with RESERVATION CONFLICT status. 3398 */ 3399 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3400 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3402 " reservation for type: %s\n", 3403 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3404 spin_unlock(&dev->dev_reservation_lock); 3405 ret = TCM_RESERVATION_CONFLICT; 3406 goto out; 3407 } 3408 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3409 /* 3410 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3411 */ 3412 type = pr_res_holder->pr_res_type; 3413 scope = pr_res_holder->pr_res_type; 3414 /* 3415 * c) Associate the reservation key specified in the SERVICE ACTION 3416 * RESERVATION KEY field with the I_T nexus specified as the 3417 * destination of the register and move, where: 3418 * A) The I_T nexus is specified by the TransportID and the 3419 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3420 * B) Regardless of the TransportID format used, the association for 3421 * the initiator port is based on either the initiator port name 3422 * (see 3.1.71) on SCSI transport protocols where port names are 3423 * required or the initiator port identifier (see 3.1.70) on SCSI 3424 * transport protocols where port names are not required; 3425 * d) Register the reservation key specified in the SERVICE ACTION 3426 * RESERVATION KEY field; 3427 * e) Retain the reservation key specified in the SERVICE ACTION 3428 * RESERVATION KEY field and associated information; 3429 * 3430 * Also, It is not an error for a REGISTER AND MOVE service action to 3431 * register an I_T nexus that is already registered with the same 3432 * reservation key or a different reservation key. 3433 */ 3434 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3435 iport_ptr); 3436 if (!dest_pr_reg) { 3437 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3438 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 3439 3440 spin_unlock(&dev->dev_reservation_lock); 3441 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3442 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3443 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3444 ret = TCM_INVALID_PARAMETER_LIST; 3445 goto out; 3446 } 3447 spin_lock(&dev->dev_reservation_lock); 3448 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3449 iport_ptr); 3450 new_reg = 1; 3451 } 3452 /* 3453 * f) Release the persistent reservation for the persistent reservation 3454 * holder (i.e., the I_T nexus on which the 3455 */ 3456 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3457 dev->dev_pr_res_holder, 0, 0); 3458 /* 3459 * g) Move the persistent reservation to the specified I_T nexus using 3460 * the same scope and type as the persistent reservation released in 3461 * item f); and 3462 */ 3463 dev->dev_pr_res_holder = dest_pr_reg; 3464 dest_pr_reg->pr_res_holder = 1; 3465 dest_pr_reg->pr_res_type = type; 3466 pr_reg->pr_res_scope = scope; 3467 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3468 /* 3469 * Increment PRGeneration for existing registrations.. 3470 */ 3471 if (!new_reg) 3472 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3473 spin_unlock(&dev->dev_reservation_lock); 3474 3475 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3476 " created new reservation holder TYPE: %s on object RTPI:" 3477 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3478 core_scsi3_pr_dump_type(type), rtpi, 3479 dest_pr_reg->pr_res_generation); 3480 pr_debug("SPC-3 PR Successfully moved reservation from" 3481 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3482 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3483 i_buf, dest_tf_ops->get_fabric_name(), 3484 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3485 iport_ptr : ""); 3486 /* 3487 * It is now safe to release configfs group dependencies for destination 3488 * of Transport ID Initiator Device/Port Identifier 3489 */ 3490 core_scsi3_lunacl_undepend_item(dest_se_deve); 3491 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3492 core_scsi3_tpg_undepend_item(dest_se_tpg); 3493 /* 3494 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3495 * nexus on which PERSISTENT RESERVE OUT command was received. 3496 */ 3497 if (unreg) { 3498 spin_lock(&pr_tmpl->registration_lock); 3499 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3500 spin_unlock(&pr_tmpl->registration_lock); 3501 } else 3502 core_scsi3_put_pr_reg(pr_reg); 3503 3504 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3505 3506 transport_kunmap_data_sg(cmd); 3507 3508 core_scsi3_put_pr_reg(dest_pr_reg); 3509 return 0; 3510 out: 3511 if (buf) 3512 transport_kunmap_data_sg(cmd); 3513 if (dest_se_deve) 3514 core_scsi3_lunacl_undepend_item(dest_se_deve); 3515 if (dest_node_acl) 3516 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3517 core_scsi3_tpg_undepend_item(dest_se_tpg); 3518 3519 out_put_pr_reg: 3520 core_scsi3_put_pr_reg(pr_reg); 3521 return ret; 3522 } 3523 3524 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3525 { 3526 unsigned int __v1, __v2; 3527 3528 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3529 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3530 3531 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3532 } 3533 3534 /* 3535 * See spc4r17 section 6.14 Table 170 3536 */ 3537 sense_reason_t 3538 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3539 { 3540 struct se_device *dev = cmd->se_dev; 3541 unsigned char *cdb = &cmd->t_task_cdb[0]; 3542 unsigned char *buf; 3543 u64 res_key, sa_res_key; 3544 int sa, scope, type, aptpl; 3545 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3546 sense_reason_t ret; 3547 3548 /* 3549 * Following spc2r20 5.5.1 Reservations overview: 3550 * 3551 * If a logical unit has been reserved by any RESERVE command and is 3552 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3553 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3554 * initiator or service action and shall terminate with a RESERVATION 3555 * CONFLICT status. 3556 */ 3557 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3558 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3559 " SPC-2 reservation is held, returning" 3560 " RESERVATION_CONFLICT\n"); 3561 return TCM_RESERVATION_CONFLICT; 3562 } 3563 3564 /* 3565 * FIXME: A NULL struct se_session pointer means an this is not coming from 3566 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3567 */ 3568 if (!cmd->se_sess) 3569 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3570 3571 if (cmd->data_length < 24) { 3572 pr_warn("SPC-PR: Received PR OUT parameter list" 3573 " length too small: %u\n", cmd->data_length); 3574 return TCM_INVALID_PARAMETER_LIST; 3575 } 3576 3577 /* 3578 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3579 */ 3580 sa = (cdb[1] & 0x1f); 3581 scope = (cdb[2] & 0xf0); 3582 type = (cdb[2] & 0x0f); 3583 3584 buf = transport_kmap_data_sg(cmd); 3585 if (!buf) 3586 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3587 3588 /* 3589 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3590 */ 3591 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3592 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3593 /* 3594 * REGISTER_AND_MOVE uses a different SA parameter list containing 3595 * SCSI TransportIDs. 3596 */ 3597 if (sa != PRO_REGISTER_AND_MOVE) { 3598 spec_i_pt = (buf[20] & 0x08); 3599 all_tg_pt = (buf[20] & 0x04); 3600 aptpl = (buf[20] & 0x01); 3601 } else { 3602 aptpl = (buf[17] & 0x01); 3603 unreg = (buf[17] & 0x02); 3604 } 3605 /* 3606 * If the backend device has been configured to force APTPL metadata 3607 * write-out, go ahead and propigate aptpl=1 down now. 3608 */ 3609 if (dev->dev_attrib.force_pr_aptpl) 3610 aptpl = 1; 3611 3612 transport_kunmap_data_sg(cmd); 3613 buf = NULL; 3614 3615 /* 3616 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3617 */ 3618 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3619 return TCM_INVALID_PARAMETER_LIST; 3620 3621 /* 3622 * From spc4r17 section 6.14: 3623 * 3624 * If the SPEC_I_PT bit is set to zero, the service action is not 3625 * REGISTER AND MOVE, and the parameter list length is not 24, then 3626 * the command shall be terminated with CHECK CONDITION status, with 3627 * the sense key set to ILLEGAL REQUEST, and the additional sense 3628 * code set to PARAMETER LIST LENGTH ERROR. 3629 */ 3630 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3631 (cmd->data_length != 24)) { 3632 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3633 " list length: %u\n", cmd->data_length); 3634 return TCM_INVALID_PARAMETER_LIST; 3635 } 3636 3637 /* 3638 * (core_scsi3_emulate_pro_* function parameters 3639 * are defined by spc4r17 Table 174: 3640 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3641 */ 3642 switch (sa) { 3643 case PRO_REGISTER: 3644 ret = core_scsi3_emulate_pro_register(cmd, 3645 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3646 break; 3647 case PRO_RESERVE: 3648 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3649 break; 3650 case PRO_RELEASE: 3651 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3652 break; 3653 case PRO_CLEAR: 3654 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3655 break; 3656 case PRO_PREEMPT: 3657 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3658 res_key, sa_res_key, PREEMPT); 3659 break; 3660 case PRO_PREEMPT_AND_ABORT: 3661 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3662 res_key, sa_res_key, PREEMPT_AND_ABORT); 3663 break; 3664 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3665 ret = core_scsi3_emulate_pro_register(cmd, 3666 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3667 break; 3668 case PRO_REGISTER_AND_MOVE: 3669 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3670 sa_res_key, aptpl, unreg); 3671 break; 3672 default: 3673 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3674 " action: 0x%02x\n", cdb[1] & 0x1f); 3675 return TCM_INVALID_CDB_FIELD; 3676 } 3677 3678 if (!ret) 3679 target_complete_cmd(cmd, GOOD); 3680 return ret; 3681 } 3682 3683 /* 3684 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3685 * 3686 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3687 */ 3688 static sense_reason_t 3689 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3690 { 3691 struct se_device *dev = cmd->se_dev; 3692 struct t10_pr_registration *pr_reg; 3693 unsigned char *buf; 3694 u32 add_len = 0, off = 8; 3695 3696 if (cmd->data_length < 8) { 3697 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3698 " too small\n", cmd->data_length); 3699 return TCM_INVALID_CDB_FIELD; 3700 } 3701 3702 buf = transport_kmap_data_sg(cmd); 3703 if (!buf) 3704 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3705 3706 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3707 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3708 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3709 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3710 3711 spin_lock(&dev->t10_pr.registration_lock); 3712 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3713 pr_reg_list) { 3714 /* 3715 * Check for overflow of 8byte PRI READ_KEYS payload and 3716 * next reservation key list descriptor. 3717 */ 3718 if ((add_len + 8) > (cmd->data_length - 8)) 3719 break; 3720 3721 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3722 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3723 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3724 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3725 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3726 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3727 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3728 buf[off++] = (pr_reg->pr_res_key & 0xff); 3729 3730 add_len += 8; 3731 } 3732 spin_unlock(&dev->t10_pr.registration_lock); 3733 3734 buf[4] = ((add_len >> 24) & 0xff); 3735 buf[5] = ((add_len >> 16) & 0xff); 3736 buf[6] = ((add_len >> 8) & 0xff); 3737 buf[7] = (add_len & 0xff); 3738 3739 transport_kunmap_data_sg(cmd); 3740 3741 return 0; 3742 } 3743 3744 /* 3745 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3746 * 3747 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3748 */ 3749 static sense_reason_t 3750 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3751 { 3752 struct se_device *dev = cmd->se_dev; 3753 struct t10_pr_registration *pr_reg; 3754 unsigned char *buf; 3755 u64 pr_res_key; 3756 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3757 3758 if (cmd->data_length < 8) { 3759 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3760 " too small\n", cmd->data_length); 3761 return TCM_INVALID_CDB_FIELD; 3762 } 3763 3764 buf = transport_kmap_data_sg(cmd); 3765 if (!buf) 3766 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3767 3768 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3769 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3770 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3771 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3772 3773 spin_lock(&dev->dev_reservation_lock); 3774 pr_reg = dev->dev_pr_res_holder; 3775 if (pr_reg) { 3776 /* 3777 * Set the hardcoded Additional Length 3778 */ 3779 buf[4] = ((add_len >> 24) & 0xff); 3780 buf[5] = ((add_len >> 16) & 0xff); 3781 buf[6] = ((add_len >> 8) & 0xff); 3782 buf[7] = (add_len & 0xff); 3783 3784 if (cmd->data_length < 22) 3785 goto err; 3786 3787 /* 3788 * Set the Reservation key. 3789 * 3790 * From spc4r17, section 5.7.10: 3791 * A persistent reservation holder has its reservation key 3792 * returned in the parameter data from a PERSISTENT 3793 * RESERVE IN command with READ RESERVATION service action as 3794 * follows: 3795 * a) For a persistent reservation of the type Write Exclusive 3796 * - All Registrants or Exclusive Access All Regitrants, 3797 * the reservation key shall be set to zero; or 3798 * b) For all other persistent reservation types, the 3799 * reservation key shall be set to the registered 3800 * reservation key for the I_T nexus that holds the 3801 * persistent reservation. 3802 */ 3803 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3804 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3805 pr_res_key = 0; 3806 else 3807 pr_res_key = pr_reg->pr_res_key; 3808 3809 buf[8] = ((pr_res_key >> 56) & 0xff); 3810 buf[9] = ((pr_res_key >> 48) & 0xff); 3811 buf[10] = ((pr_res_key >> 40) & 0xff); 3812 buf[11] = ((pr_res_key >> 32) & 0xff); 3813 buf[12] = ((pr_res_key >> 24) & 0xff); 3814 buf[13] = ((pr_res_key >> 16) & 0xff); 3815 buf[14] = ((pr_res_key >> 8) & 0xff); 3816 buf[15] = (pr_res_key & 0xff); 3817 /* 3818 * Set the SCOPE and TYPE 3819 */ 3820 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3821 (pr_reg->pr_res_type & 0x0f); 3822 } 3823 3824 err: 3825 spin_unlock(&dev->dev_reservation_lock); 3826 transport_kunmap_data_sg(cmd); 3827 3828 return 0; 3829 } 3830 3831 /* 3832 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3833 * 3834 * See spc4r17 section 6.13.4 Table 165 3835 */ 3836 static sense_reason_t 3837 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3838 { 3839 struct se_device *dev = cmd->se_dev; 3840 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3841 unsigned char *buf; 3842 u16 add_len = 8; /* Hardcoded to 8. */ 3843 3844 if (cmd->data_length < 6) { 3845 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3846 " %u too small\n", cmd->data_length); 3847 return TCM_INVALID_CDB_FIELD; 3848 } 3849 3850 buf = transport_kmap_data_sg(cmd); 3851 if (!buf) 3852 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3853 3854 buf[0] = ((add_len >> 8) & 0xff); 3855 buf[1] = (add_len & 0xff); 3856 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3857 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3858 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3859 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3860 /* 3861 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3862 * set the TMV: Task Mask Valid bit. 3863 */ 3864 buf[3] |= 0x80; 3865 /* 3866 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3867 */ 3868 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3869 /* 3870 * PTPL_A: Persistence across Target Power Loss Active bit 3871 */ 3872 if (pr_tmpl->pr_aptpl_active) 3873 buf[3] |= 0x01; 3874 /* 3875 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3876 */ 3877 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3878 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3879 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3880 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3881 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3882 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3883 3884 transport_kunmap_data_sg(cmd); 3885 3886 return 0; 3887 } 3888 3889 /* 3890 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3891 * 3892 * See spc4r17 section 6.13.5 Table 168 and 169 3893 */ 3894 static sense_reason_t 3895 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3896 { 3897 struct se_device *dev = cmd->se_dev; 3898 struct se_node_acl *se_nacl; 3899 struct se_portal_group *se_tpg; 3900 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3901 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3902 unsigned char *buf; 3903 u32 add_desc_len = 0, add_len = 0; 3904 u32 off = 8; /* off into first Full Status descriptor */ 3905 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3906 int exp_desc_len, desc_len; 3907 bool all_reg = false; 3908 3909 if (cmd->data_length < 8) { 3910 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3911 " too small\n", cmd->data_length); 3912 return TCM_INVALID_CDB_FIELD; 3913 } 3914 3915 buf = transport_kmap_data_sg(cmd); 3916 if (!buf) 3917 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3918 3919 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3920 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3921 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3922 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3923 3924 spin_lock(&dev->dev_reservation_lock); 3925 if (dev->dev_pr_res_holder) { 3926 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3927 3928 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3929 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3930 all_reg = true; 3931 pr_res_type = pr_holder->pr_res_type; 3932 pr_res_scope = pr_holder->pr_res_scope; 3933 } 3934 } 3935 spin_unlock(&dev->dev_reservation_lock); 3936 3937 spin_lock(&pr_tmpl->registration_lock); 3938 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3939 &pr_tmpl->registration_list, pr_reg_list) { 3940 3941 se_nacl = pr_reg->pr_reg_nacl; 3942 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3943 add_desc_len = 0; 3944 3945 atomic_inc_mb(&pr_reg->pr_res_holders); 3946 spin_unlock(&pr_tmpl->registration_lock); 3947 /* 3948 * Determine expected length of $FABRIC_MOD specific 3949 * TransportID full status descriptor.. 3950 */ 3951 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3952 &format_code); 3953 if (exp_desc_len < 0 || 3954 exp_desc_len + add_len > cmd->data_length) { 3955 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3956 " out of buffer: %d\n", cmd->data_length); 3957 spin_lock(&pr_tmpl->registration_lock); 3958 atomic_dec_mb(&pr_reg->pr_res_holders); 3959 break; 3960 } 3961 /* 3962 * Set RESERVATION KEY 3963 */ 3964 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3965 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3966 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3967 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3968 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3969 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3970 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3971 buf[off++] = (pr_reg->pr_res_key & 0xff); 3972 off += 4; /* Skip Over Reserved area */ 3973 3974 /* 3975 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3976 */ 3977 if (pr_reg->pr_reg_all_tg_pt) 3978 buf[off] = 0x02; 3979 /* 3980 * The struct se_lun pointer will be present for the 3981 * reservation holder for PR_HOLDER bit. 3982 * 3983 * Also, if this registration is the reservation 3984 * holder or there is an All Registrants reservation 3985 * active, fill in SCOPE and TYPE in the next byte. 3986 */ 3987 if (pr_reg->pr_res_holder) { 3988 buf[off++] |= 0x01; 3989 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3990 (pr_reg->pr_res_type & 0x0f); 3991 } else if (all_reg) { 3992 buf[off++] |= 0x01; 3993 buf[off++] = (pr_res_scope & 0xf0) | 3994 (pr_res_type & 0x0f); 3995 } else { 3996 off += 2; 3997 } 3998 3999 off += 4; /* Skip over reserved area */ 4000 /* 4001 * From spc4r17 6.3.15: 4002 * 4003 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4004 * IDENTIFIER field contains the relative port identifier (see 4005 * 3.1.120) of the target port that is part of the I_T nexus 4006 * described by this full status descriptor. If the ALL_TG_PT 4007 * bit is set to one, the contents of the RELATIVE TARGET PORT 4008 * IDENTIFIER field are not defined by this standard. 4009 */ 4010 if (!pr_reg->pr_reg_all_tg_pt) { 4011 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4012 4013 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4014 buf[off++] = (sep_rtpi & 0xff); 4015 } else 4016 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4017 4018 buf[off+4] = se_tpg->proto_id; 4019 4020 /* 4021 * Now, have the $FABRIC_MOD fill in the transport ID. 4022 */ 4023 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4024 &format_code, &buf[off+4]); 4025 4026 spin_lock(&pr_tmpl->registration_lock); 4027 atomic_dec_mb(&pr_reg->pr_res_holders); 4028 4029 if (desc_len < 0) 4030 break; 4031 /* 4032 * Set the ADDITIONAL DESCRIPTOR LENGTH 4033 */ 4034 buf[off++] = ((desc_len >> 24) & 0xff); 4035 buf[off++] = ((desc_len >> 16) & 0xff); 4036 buf[off++] = ((desc_len >> 8) & 0xff); 4037 buf[off++] = (desc_len & 0xff); 4038 /* 4039 * Size of full desctipor header minus TransportID 4040 * containing $FABRIC_MOD specific) initiator device/port 4041 * WWN information. 4042 * 4043 * See spc4r17 Section 6.13.5 Table 169 4044 */ 4045 add_desc_len = (24 + desc_len); 4046 4047 off += desc_len; 4048 add_len += add_desc_len; 4049 } 4050 spin_unlock(&pr_tmpl->registration_lock); 4051 /* 4052 * Set ADDITIONAL_LENGTH 4053 */ 4054 buf[4] = ((add_len >> 24) & 0xff); 4055 buf[5] = ((add_len >> 16) & 0xff); 4056 buf[6] = ((add_len >> 8) & 0xff); 4057 buf[7] = (add_len & 0xff); 4058 4059 transport_kunmap_data_sg(cmd); 4060 4061 return 0; 4062 } 4063 4064 sense_reason_t 4065 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4066 { 4067 sense_reason_t ret; 4068 4069 /* 4070 * Following spc2r20 5.5.1 Reservations overview: 4071 * 4072 * If a logical unit has been reserved by any RESERVE command and is 4073 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4074 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4075 * initiator or service action and shall terminate with a RESERVATION 4076 * CONFLICT status. 4077 */ 4078 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4079 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4080 " SPC-2 reservation is held, returning" 4081 " RESERVATION_CONFLICT\n"); 4082 return TCM_RESERVATION_CONFLICT; 4083 } 4084 4085 switch (cmd->t_task_cdb[1] & 0x1f) { 4086 case PRI_READ_KEYS: 4087 ret = core_scsi3_pri_read_keys(cmd); 4088 break; 4089 case PRI_READ_RESERVATION: 4090 ret = core_scsi3_pri_read_reservation(cmd); 4091 break; 4092 case PRI_REPORT_CAPABILITIES: 4093 ret = core_scsi3_pri_report_capabilities(cmd); 4094 break; 4095 case PRI_READ_FULL_STATUS: 4096 ret = core_scsi3_pri_read_full_status(cmd); 4097 break; 4098 default: 4099 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4100 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4101 return TCM_INVALID_CDB_FIELD; 4102 } 4103 4104 if (!ret) 4105 target_complete_cmd(cmd, GOOD); 4106 return ret; 4107 } 4108 4109 sense_reason_t 4110 target_check_reservation(struct se_cmd *cmd) 4111 { 4112 struct se_device *dev = cmd->se_dev; 4113 sense_reason_t ret; 4114 4115 if (!cmd->se_sess) 4116 return 0; 4117 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4118 return 0; 4119 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4120 return 0; 4121 4122 spin_lock(&dev->dev_reservation_lock); 4123 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4124 ret = target_scsi2_reservation_check(cmd); 4125 else 4126 ret = target_scsi3_pr_reservation_check(cmd); 4127 spin_unlock(&dev->dev_reservation_lock); 4128 4129 return ret; 4130 } 4131