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/vmalloc.h> 31 #include <linux/file.h> 32 #include <scsi/scsi_proto.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: %llu ->" 233 " MAPPED LUN: %llu for %s\n", 234 tpg->se_tpg_tfo->get_fabric_name(), 235 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 236 sess->se_node_acl->initiatorname); 237 238 out_unlock: 239 spin_unlock(&dev->dev_reservation_lock); 240 out: 241 target_complete_cmd(cmd, GOOD); 242 return 0; 243 } 244 245 sense_reason_t 246 target_scsi2_reservation_reserve(struct se_cmd *cmd) 247 { 248 struct se_device *dev = cmd->se_dev; 249 struct se_session *sess = cmd->se_sess; 250 struct se_portal_group *tpg; 251 sense_reason_t ret = 0; 252 int rc; 253 254 if ((cmd->t_task_cdb[1] & 0x01) && 255 (cmd->t_task_cdb[1] & 0x02)) { 256 pr_err("LongIO and Obselete Bits set, returning" 257 " ILLEGAL_REQUEST\n"); 258 return TCM_UNSUPPORTED_SCSI_OPCODE; 259 } 260 /* 261 * This is currently the case for target_core_mod passthrough struct se_cmd 262 * ops 263 */ 264 if (!sess || !sess->se_tpg) 265 goto out; 266 rc = target_check_scsi2_reservation_conflict(cmd); 267 if (rc == 1) 268 goto out; 269 270 if (rc < 0) 271 return TCM_RESERVATION_CONFLICT; 272 273 tpg = sess->se_tpg; 274 spin_lock(&dev->dev_reservation_lock); 275 if (dev->dev_reserved_node_acl && 276 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 277 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 278 tpg->se_tpg_tfo->get_fabric_name()); 279 pr_err("Original reserver LUN: %llu %s\n", 280 cmd->se_lun->unpacked_lun, 281 dev->dev_reserved_node_acl->initiatorname); 282 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 283 " from %s \n", cmd->se_lun->unpacked_lun, 284 cmd->orig_fe_lun, 285 sess->se_node_acl->initiatorname); 286 ret = TCM_RESERVATION_CONFLICT; 287 goto out_unlock; 288 } 289 290 dev->dev_reserved_node_acl = sess->se_node_acl; 291 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 292 if (sess->sess_bin_isid != 0) { 293 dev->dev_res_bin_isid = sess->sess_bin_isid; 294 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 295 } 296 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 297 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 298 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 299 sess->se_node_acl->initiatorname); 300 301 out_unlock: 302 spin_unlock(&dev->dev_reservation_lock); 303 out: 304 if (!ret) 305 target_complete_cmd(cmd, GOOD); 306 return ret; 307 } 308 309 310 /* 311 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 312 * 313 * This function is called by those initiator ports who are *NOT* 314 * the active PR reservation holder when a reservation is present. 315 */ 316 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 317 bool isid_mismatch) 318 { 319 unsigned char *cdb = cmd->t_task_cdb; 320 struct se_session *se_sess = cmd->se_sess; 321 struct se_node_acl *nacl = se_sess->se_node_acl; 322 int other_cdb = 0; 323 int registered_nexus = 0, ret = 1; /* Conflict by default */ 324 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 325 int we = 0; /* Write Exclusive */ 326 int legacy = 0; /* Act like a legacy device and return 327 * RESERVATION CONFLICT on some CDBs */ 328 329 if (isid_mismatch) { 330 registered_nexus = 0; 331 } else { 332 struct se_dev_entry *se_deve; 333 334 rcu_read_lock(); 335 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 336 if (se_deve) 337 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 338 &se_deve->deve_flags); 339 rcu_read_unlock(); 340 } 341 342 switch (pr_reg_type) { 343 case PR_TYPE_WRITE_EXCLUSIVE: 344 we = 1; 345 case PR_TYPE_EXCLUSIVE_ACCESS: 346 /* 347 * Some commands are only allowed for the persistent reservation 348 * holder. 349 */ 350 break; 351 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 352 we = 1; 353 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 354 /* 355 * Some commands are only allowed for registered I_T Nexuses. 356 */ 357 reg_only = 1; 358 break; 359 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 360 we = 1; 361 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 362 /* 363 * Each registered I_T Nexus is a reservation holder. 364 */ 365 all_reg = 1; 366 break; 367 default: 368 return -EINVAL; 369 } 370 /* 371 * Referenced from spc4r17 table 45 for *NON* PR holder access 372 */ 373 switch (cdb[0]) { 374 case SECURITY_PROTOCOL_IN: 375 if (registered_nexus) 376 return 0; 377 ret = (we) ? 0 : 1; 378 break; 379 case MODE_SENSE: 380 case MODE_SENSE_10: 381 case READ_ATTRIBUTE: 382 case READ_BUFFER: 383 case RECEIVE_DIAGNOSTIC: 384 if (legacy) { 385 ret = 1; 386 break; 387 } 388 if (registered_nexus) { 389 ret = 0; 390 break; 391 } 392 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 393 break; 394 case PERSISTENT_RESERVE_OUT: 395 /* 396 * This follows PERSISTENT_RESERVE_OUT service actions that 397 * are allowed in the presence of various reservations. 398 * See spc4r17, table 46 399 */ 400 switch (cdb[1] & 0x1f) { 401 case PRO_CLEAR: 402 case PRO_PREEMPT: 403 case PRO_PREEMPT_AND_ABORT: 404 ret = (registered_nexus) ? 0 : 1; 405 break; 406 case PRO_REGISTER: 407 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 408 ret = 0; 409 break; 410 case PRO_REGISTER_AND_MOVE: 411 case PRO_RESERVE: 412 ret = 1; 413 break; 414 case PRO_RELEASE: 415 ret = (registered_nexus) ? 0 : 1; 416 break; 417 default: 418 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 419 " action: 0x%02x\n", cdb[1] & 0x1f); 420 return -EINVAL; 421 } 422 break; 423 case RELEASE: 424 case RELEASE_10: 425 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 426 ret = 0; 427 break; 428 case RESERVE: 429 case RESERVE_10: 430 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 431 ret = 0; 432 break; 433 case TEST_UNIT_READY: 434 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 435 break; 436 case MAINTENANCE_IN: 437 switch (cdb[1] & 0x1f) { 438 case MI_MANAGEMENT_PROTOCOL_IN: 439 if (registered_nexus) { 440 ret = 0; 441 break; 442 } 443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 444 break; 445 case MI_REPORT_SUPPORTED_OPERATION_CODES: 446 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 447 if (legacy) { 448 ret = 1; 449 break; 450 } 451 if (registered_nexus) { 452 ret = 0; 453 break; 454 } 455 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 456 break; 457 case MI_REPORT_ALIASES: 458 case MI_REPORT_IDENTIFYING_INFORMATION: 459 case MI_REPORT_PRIORITY: 460 case MI_REPORT_TARGET_PGS: 461 case MI_REPORT_TIMESTAMP: 462 ret = 0; /* Allowed */ 463 break; 464 default: 465 pr_err("Unknown MI Service Action: 0x%02x\n", 466 (cdb[1] & 0x1f)); 467 return -EINVAL; 468 } 469 break; 470 case ACCESS_CONTROL_IN: 471 case ACCESS_CONTROL_OUT: 472 case INQUIRY: 473 case LOG_SENSE: 474 case SERVICE_ACTION_IN_12: 475 case REPORT_LUNS: 476 case REQUEST_SENSE: 477 case PERSISTENT_RESERVE_IN: 478 ret = 0; /*/ Allowed CDBs */ 479 break; 480 default: 481 other_cdb = 1; 482 break; 483 } 484 /* 485 * Case where the CDB is explicitly allowed in the above switch 486 * statement. 487 */ 488 if (!ret && !other_cdb) { 489 pr_debug("Allowing explicit CDB: 0x%02x for %s" 490 " reservation holder\n", cdb[0], 491 core_scsi3_pr_dump_type(pr_reg_type)); 492 493 return ret; 494 } 495 /* 496 * Check if write exclusive initiator ports *NOT* holding the 497 * WRITE_EXCLUSIVE_* reservation. 498 */ 499 if (we && !registered_nexus) { 500 if (cmd->data_direction == DMA_TO_DEVICE) { 501 /* 502 * Conflict for write exclusive 503 */ 504 pr_debug("%s Conflict for unregistered nexus" 505 " %s CDB: 0x%02x to %s reservation\n", 506 transport_dump_cmd_direction(cmd), 507 se_sess->se_node_acl->initiatorname, cdb[0], 508 core_scsi3_pr_dump_type(pr_reg_type)); 509 return 1; 510 } else { 511 /* 512 * Allow non WRITE CDBs for all Write Exclusive 513 * PR TYPEs to pass for registered and 514 * non-registered_nexuxes NOT holding the reservation. 515 * 516 * We only make noise for the unregisterd nexuses, 517 * as we expect registered non-reservation holding 518 * nexuses to issue CDBs. 519 */ 520 521 if (!registered_nexus) { 522 pr_debug("Allowing implicit CDB: 0x%02x" 523 " for %s reservation on unregistered" 524 " nexus\n", cdb[0], 525 core_scsi3_pr_dump_type(pr_reg_type)); 526 } 527 528 return 0; 529 } 530 } else if ((reg_only) || (all_reg)) { 531 if (registered_nexus) { 532 /* 533 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 534 * allow commands from registered nexuses. 535 */ 536 537 pr_debug("Allowing implicit CDB: 0x%02x for %s" 538 " reservation\n", cdb[0], 539 core_scsi3_pr_dump_type(pr_reg_type)); 540 541 return 0; 542 } 543 } else if (we && registered_nexus) { 544 /* 545 * Reads are allowed for Write Exclusive locks 546 * from all registrants. 547 */ 548 if (cmd->data_direction == DMA_FROM_DEVICE) { 549 pr_debug("Allowing READ CDB: 0x%02x for %s" 550 " reservation\n", cdb[0], 551 core_scsi3_pr_dump_type(pr_reg_type)); 552 553 return 0; 554 } 555 } 556 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 557 " for %s reservation\n", transport_dump_cmd_direction(cmd), 558 (registered_nexus) ? "" : "un", 559 se_sess->se_node_acl->initiatorname, cdb[0], 560 core_scsi3_pr_dump_type(pr_reg_type)); 561 562 return 1; /* Conflict by default */ 563 } 564 565 static sense_reason_t 566 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 567 { 568 struct se_device *dev = cmd->se_dev; 569 struct se_session *sess = cmd->se_sess; 570 u32 pr_reg_type; 571 bool isid_mismatch = false; 572 573 if (!dev->dev_pr_res_holder) 574 return 0; 575 576 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 577 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 578 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 579 goto check_nonholder; 580 581 if (dev->dev_pr_res_holder->isid_present_at_reg) { 582 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 583 sess->sess_bin_isid) { 584 isid_mismatch = true; 585 goto check_nonholder; 586 } 587 } 588 589 return 0; 590 591 check_nonholder: 592 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 593 return TCM_RESERVATION_CONFLICT; 594 return 0; 595 } 596 597 static u32 core_scsi3_pr_generation(struct se_device *dev) 598 { 599 u32 prg; 600 601 /* 602 * PRGeneration field shall contain the value of a 32-bit wrapping 603 * counter mainted by the device server. 604 * 605 * Note that this is done regardless of Active Persist across 606 * Target PowerLoss (APTPL) 607 * 608 * See spc4r17 section 6.3.12 READ_KEYS service action 609 */ 610 spin_lock(&dev->dev_reservation_lock); 611 prg = dev->t10_pr.pr_generation++; 612 spin_unlock(&dev->dev_reservation_lock); 613 614 return prg; 615 } 616 617 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 618 struct se_device *dev, 619 struct se_node_acl *nacl, 620 struct se_lun *lun, 621 struct se_dev_entry *dest_deve, 622 u64 mapped_lun, 623 unsigned char *isid, 624 u64 sa_res_key, 625 int all_tg_pt, 626 int aptpl) 627 { 628 struct t10_pr_registration *pr_reg; 629 630 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 631 if (!pr_reg) { 632 pr_err("Unable to allocate struct t10_pr_registration\n"); 633 return NULL; 634 } 635 636 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 637 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 641 atomic_set(&pr_reg->pr_res_holders, 0); 642 pr_reg->pr_reg_nacl = nacl; 643 /* 644 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 645 * the se_dev_entry->pr_ref will have been already obtained by 646 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 647 * 648 * Otherwise, locate se_dev_entry now and obtain a reference until 649 * registration completes in __core_scsi3_add_registration(). 650 */ 651 if (dest_deve) { 652 pr_reg->pr_reg_deve = dest_deve; 653 } else { 654 rcu_read_lock(); 655 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 656 if (!pr_reg->pr_reg_deve) { 657 rcu_read_unlock(); 658 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 659 nacl->initiatorname, mapped_lun); 660 kmem_cache_free(t10_pr_reg_cache, pr_reg); 661 return NULL; 662 } 663 kref_get(&pr_reg->pr_reg_deve->pr_kref); 664 rcu_read_unlock(); 665 } 666 pr_reg->pr_res_mapped_lun = mapped_lun; 667 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 668 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 669 pr_reg->pr_res_key = sa_res_key; 670 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 671 pr_reg->pr_reg_aptpl = aptpl; 672 /* 673 * If an ISID value for this SCSI Initiator Port exists, 674 * save it to the registration now. 675 */ 676 if (isid != NULL) { 677 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 678 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 679 pr_reg->isid_present_at_reg = 1; 680 } 681 682 return pr_reg; 683 } 684 685 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 686 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 687 688 /* 689 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 690 * modes. 691 */ 692 static struct t10_pr_registration *__core_scsi3_alloc_registration( 693 struct se_device *dev, 694 struct se_node_acl *nacl, 695 struct se_lun *lun, 696 struct se_dev_entry *deve, 697 u64 mapped_lun, 698 unsigned char *isid, 699 u64 sa_res_key, 700 int all_tg_pt, 701 int aptpl) 702 { 703 struct se_dev_entry *deve_tmp; 704 struct se_node_acl *nacl_tmp; 705 struct se_lun_acl *lacl_tmp; 706 struct se_lun *lun_tmp, *next, *dest_lun; 707 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 708 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 709 int ret; 710 /* 711 * Create a registration for the I_T Nexus upon which the 712 * PROUT REGISTER was received. 713 */ 714 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 715 isid, sa_res_key, all_tg_pt, 716 aptpl); 717 if (!pr_reg) 718 return NULL; 719 /* 720 * Return pointer to pr_reg for ALL_TG_PT=0 721 */ 722 if (!all_tg_pt) 723 return pr_reg; 724 /* 725 * Create list of matching SCSI Initiator Port registrations 726 * for ALL_TG_PT=1 727 */ 728 spin_lock(&dev->se_port_lock); 729 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 730 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 731 continue; 732 spin_unlock(&dev->se_port_lock); 733 734 spin_lock(&lun_tmp->lun_deve_lock); 735 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 736 /* 737 * This pointer will be NULL for demo mode MappedLUNs 738 * that have not been make explicit via a ConfigFS 739 * MappedLUN group for the SCSI Initiator Node ACL. 740 */ 741 if (!deve_tmp->se_lun_acl) 742 continue; 743 744 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 745 lockdep_is_held(&lun_tmp->lun_deve_lock)); 746 nacl_tmp = lacl_tmp->se_lun_nacl; 747 /* 748 * Skip the matching struct se_node_acl that is allocated 749 * above.. 750 */ 751 if (nacl == nacl_tmp) 752 continue; 753 /* 754 * Only perform PR registrations for target ports on 755 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 756 * arrived. 757 */ 758 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 759 continue; 760 /* 761 * Look for a matching Initiator Node ACL in ASCII format 762 */ 763 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 764 continue; 765 766 kref_get(&deve_tmp->pr_kref); 767 spin_unlock(&lun_tmp->lun_deve_lock); 768 /* 769 * Grab a configfs group dependency that is released 770 * for the exception path at label out: below, or upon 771 * completion of adding ALL_TG_PT=1 registrations in 772 * __core_scsi3_add_registration() 773 */ 774 ret = core_scsi3_lunacl_depend_item(deve_tmp); 775 if (ret < 0) { 776 pr_err("core_scsi3_lunacl_depend" 777 "_item() failed\n"); 778 percpu_ref_put(&lun_tmp->lun_ref); 779 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 780 goto out; 781 } 782 /* 783 * Located a matching SCSI Initiator Port on a different 784 * port, allocate the pr_reg_atp and attach it to the 785 * pr_reg->pr_reg_atp_list that will be processed once 786 * the original *pr_reg is processed in 787 * __core_scsi3_add_registration() 788 */ 789 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 790 atomic_read(&deve_tmp->pr_kref.refcount) != 0); 791 792 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 793 nacl_tmp, dest_lun, deve_tmp, 794 deve_tmp->mapped_lun, NULL, 795 sa_res_key, all_tg_pt, aptpl); 796 if (!pr_reg_atp) { 797 percpu_ref_put(&lun_tmp->lun_ref); 798 core_scsi3_lunacl_undepend_item(deve_tmp); 799 goto out; 800 } 801 802 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 803 &pr_reg->pr_reg_atp_list); 804 spin_lock(&lun_tmp->lun_deve_lock); 805 } 806 spin_unlock(&lun_tmp->lun_deve_lock); 807 808 spin_lock(&dev->se_port_lock); 809 percpu_ref_put(&lun_tmp->lun_ref); 810 } 811 spin_unlock(&dev->se_port_lock); 812 813 return pr_reg; 814 out: 815 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 816 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 817 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 818 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 819 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 820 } 821 kmem_cache_free(t10_pr_reg_cache, pr_reg); 822 return NULL; 823 } 824 825 int core_scsi3_alloc_aptpl_registration( 826 struct t10_reservation *pr_tmpl, 827 u64 sa_res_key, 828 unsigned char *i_port, 829 unsigned char *isid, 830 u64 mapped_lun, 831 unsigned char *t_port, 832 u16 tpgt, 833 u64 target_lun, 834 int res_holder, 835 int all_tg_pt, 836 u8 type) 837 { 838 struct t10_pr_registration *pr_reg; 839 840 if (!i_port || !t_port || !sa_res_key) { 841 pr_err("Illegal parameters for APTPL registration\n"); 842 return -EINVAL; 843 } 844 845 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 846 if (!pr_reg) { 847 pr_err("Unable to allocate struct t10_pr_registration\n"); 848 return -ENOMEM; 849 } 850 851 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 852 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 853 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 854 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 855 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 856 atomic_set(&pr_reg->pr_res_holders, 0); 857 pr_reg->pr_reg_nacl = NULL; 858 pr_reg->pr_reg_deve = NULL; 859 pr_reg->pr_res_mapped_lun = mapped_lun; 860 pr_reg->pr_aptpl_target_lun = target_lun; 861 pr_reg->pr_res_key = sa_res_key; 862 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 863 pr_reg->pr_reg_aptpl = 1; 864 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 865 pr_reg->pr_res_type = type; 866 /* 867 * If an ISID value had been saved in APTPL metadata for this 868 * SCSI Initiator Port, restore it now. 869 */ 870 if (isid != NULL) { 871 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 872 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 873 pr_reg->isid_present_at_reg = 1; 874 } 875 /* 876 * Copy the i_port and t_port information from caller. 877 */ 878 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 879 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 880 pr_reg->pr_reg_tpgt = tpgt; 881 /* 882 * Set pr_res_holder from caller, the pr_reg who is the reservation 883 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 884 * the Initiator Node LUN ACL from the fabric module is created for 885 * this registration. 886 */ 887 pr_reg->pr_res_holder = res_holder; 888 889 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 890 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 891 " metadata\n", (res_holder) ? "+reservation" : ""); 892 return 0; 893 } 894 895 static void core_scsi3_aptpl_reserve( 896 struct se_device *dev, 897 struct se_portal_group *tpg, 898 struct se_node_acl *node_acl, 899 struct t10_pr_registration *pr_reg) 900 { 901 char i_buf[PR_REG_ISID_ID_LEN]; 902 903 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 904 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 905 906 spin_lock(&dev->dev_reservation_lock); 907 dev->dev_pr_res_holder = pr_reg; 908 spin_unlock(&dev->dev_reservation_lock); 909 910 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 911 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 912 tpg->se_tpg_tfo->get_fabric_name(), 913 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 914 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 915 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 916 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 917 i_buf); 918 } 919 920 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 921 struct t10_pr_registration *, enum register_type, int); 922 923 static int __core_scsi3_check_aptpl_registration( 924 struct se_device *dev, 925 struct se_portal_group *tpg, 926 struct se_lun *lun, 927 u64 target_lun, 928 struct se_node_acl *nacl, 929 u64 mapped_lun) 930 { 931 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 932 struct t10_reservation *pr_tmpl = &dev->t10_pr; 933 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 934 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 935 u16 tpgt; 936 937 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 938 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 939 /* 940 * Copy Initiator Port information from struct se_node_acl 941 */ 942 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 943 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 944 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 945 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 946 /* 947 * Look for the matching registrations+reservation from those 948 * created from APTPL metadata. Note that multiple registrations 949 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 950 * TransportIDs. 951 */ 952 spin_lock(&pr_tmpl->aptpl_reg_lock); 953 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 954 pr_reg_aptpl_list) { 955 956 if (!strcmp(pr_reg->pr_iport, i_port) && 957 (pr_reg->pr_res_mapped_lun == mapped_lun) && 958 !(strcmp(pr_reg->pr_tport, t_port)) && 959 (pr_reg->pr_reg_tpgt == tpgt) && 960 (pr_reg->pr_aptpl_target_lun == target_lun)) { 961 /* 962 * Obtain the ->pr_reg_deve pointer + reference, that 963 * is released by __core_scsi3_add_registration() below. 964 */ 965 rcu_read_lock(); 966 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 967 if (!pr_reg->pr_reg_deve) { 968 pr_err("Unable to locate PR APTPL %s mapped_lun:" 969 " %llu\n", nacl->initiatorname, mapped_lun); 970 rcu_read_unlock(); 971 continue; 972 } 973 kref_get(&pr_reg->pr_reg_deve->pr_kref); 974 rcu_read_unlock(); 975 976 pr_reg->pr_reg_nacl = nacl; 977 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 978 list_del(&pr_reg->pr_reg_aptpl_list); 979 spin_unlock(&pr_tmpl->aptpl_reg_lock); 980 /* 981 * At this point all of the pointers in *pr_reg will 982 * be setup, so go ahead and add the registration. 983 */ 984 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 985 /* 986 * If this registration is the reservation holder, 987 * make that happen now.. 988 */ 989 if (pr_reg->pr_res_holder) 990 core_scsi3_aptpl_reserve(dev, tpg, 991 nacl, pr_reg); 992 /* 993 * Reenable pr_aptpl_active to accept new metadata 994 * updates once the SCSI device is active again.. 995 */ 996 spin_lock(&pr_tmpl->aptpl_reg_lock); 997 pr_tmpl->pr_aptpl_active = 1; 998 } 999 } 1000 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1001 1002 return 0; 1003 } 1004 1005 int core_scsi3_check_aptpl_registration( 1006 struct se_device *dev, 1007 struct se_portal_group *tpg, 1008 struct se_lun *lun, 1009 struct se_node_acl *nacl, 1010 u64 mapped_lun) 1011 { 1012 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1013 return 0; 1014 1015 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1016 lun->unpacked_lun, nacl, 1017 mapped_lun); 1018 } 1019 1020 static void __core_scsi3_dump_registration( 1021 const struct target_core_fabric_ops *tfo, 1022 struct se_device *dev, 1023 struct se_node_acl *nacl, 1024 struct t10_pr_registration *pr_reg, 1025 enum register_type register_type) 1026 { 1027 struct se_portal_group *se_tpg = nacl->se_tpg; 1028 char i_buf[PR_REG_ISID_ID_LEN]; 1029 1030 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1031 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1032 1033 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1034 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1035 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1036 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1037 i_buf); 1038 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1039 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1040 tfo->tpg_get_tag(se_tpg)); 1041 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1042 " Port(s)\n", tfo->get_fabric_name(), 1043 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1044 dev->transport->name); 1045 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1046 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1047 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1048 pr_reg->pr_reg_aptpl); 1049 } 1050 1051 static void __core_scsi3_add_registration( 1052 struct se_device *dev, 1053 struct se_node_acl *nacl, 1054 struct t10_pr_registration *pr_reg, 1055 enum register_type register_type, 1056 int register_move) 1057 { 1058 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1059 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1060 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1061 struct se_dev_entry *deve; 1062 1063 /* 1064 * Increment PRgeneration counter for struct se_device upon a successful 1065 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1066 * 1067 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1068 * action, the struct se_device->dev_reservation_lock will already be held, 1069 * so we do not call core_scsi3_pr_generation() which grabs the lock 1070 * for the REGISTER. 1071 */ 1072 pr_reg->pr_res_generation = (register_move) ? 1073 dev->t10_pr.pr_generation++ : 1074 core_scsi3_pr_generation(dev); 1075 1076 spin_lock(&pr_tmpl->registration_lock); 1077 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1078 1079 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1080 spin_unlock(&pr_tmpl->registration_lock); 1081 /* 1082 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1083 */ 1084 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1085 goto out; 1086 /* 1087 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1088 * allocated in __core_scsi3_alloc_registration() 1089 */ 1090 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1091 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1092 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1093 1094 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1095 1096 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1097 1098 spin_lock(&pr_tmpl->registration_lock); 1099 list_add_tail(&pr_reg_tmp->pr_reg_list, 1100 &pr_tmpl->registration_list); 1101 1102 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1103 register_type); 1104 spin_unlock(&pr_tmpl->registration_lock); 1105 /* 1106 * Drop configfs group dependency reference and deve->pr_kref 1107 * obtained from __core_scsi3_alloc_registration() code. 1108 */ 1109 rcu_read_lock(); 1110 deve = pr_reg_tmp->pr_reg_deve; 1111 if (deve) { 1112 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1113 core_scsi3_lunacl_undepend_item(deve); 1114 pr_reg_tmp->pr_reg_deve = NULL; 1115 } 1116 rcu_read_unlock(); 1117 } 1118 out: 1119 /* 1120 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1121 */ 1122 rcu_read_lock(); 1123 deve = pr_reg->pr_reg_deve; 1124 if (deve) { 1125 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1126 kref_put(&deve->pr_kref, target_pr_kref_release); 1127 pr_reg->pr_reg_deve = NULL; 1128 } 1129 rcu_read_unlock(); 1130 } 1131 1132 static int core_scsi3_alloc_registration( 1133 struct se_device *dev, 1134 struct se_node_acl *nacl, 1135 struct se_lun *lun, 1136 struct se_dev_entry *deve, 1137 u64 mapped_lun, 1138 unsigned char *isid, 1139 u64 sa_res_key, 1140 int all_tg_pt, 1141 int aptpl, 1142 enum register_type register_type, 1143 int register_move) 1144 { 1145 struct t10_pr_registration *pr_reg; 1146 1147 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1148 isid, sa_res_key, all_tg_pt, 1149 aptpl); 1150 if (!pr_reg) 1151 return -EPERM; 1152 1153 __core_scsi3_add_registration(dev, nacl, pr_reg, 1154 register_type, register_move); 1155 return 0; 1156 } 1157 1158 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1159 struct se_device *dev, 1160 struct se_node_acl *nacl, 1161 unsigned char *isid) 1162 { 1163 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1164 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1165 struct se_portal_group *tpg; 1166 1167 spin_lock(&pr_tmpl->registration_lock); 1168 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1169 &pr_tmpl->registration_list, pr_reg_list) { 1170 /* 1171 * First look for a matching struct se_node_acl 1172 */ 1173 if (pr_reg->pr_reg_nacl != nacl) 1174 continue; 1175 1176 tpg = pr_reg->pr_reg_nacl->se_tpg; 1177 /* 1178 * If this registration does NOT contain a fabric provided 1179 * ISID, then we have found a match. 1180 */ 1181 if (!pr_reg->isid_present_at_reg) { 1182 /* 1183 * Determine if this SCSI device server requires that 1184 * SCSI Intiatior TransportID w/ ISIDs is enforced 1185 * for fabric modules (iSCSI) requiring them. 1186 */ 1187 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1188 if (dev->dev_attrib.enforce_pr_isids) 1189 continue; 1190 } 1191 atomic_inc_mb(&pr_reg->pr_res_holders); 1192 spin_unlock(&pr_tmpl->registration_lock); 1193 return pr_reg; 1194 } 1195 /* 1196 * If the *pr_reg contains a fabric defined ISID for multi-value 1197 * SCSI Initiator Port TransportIDs, then we expect a valid 1198 * matching ISID to be provided by the local SCSI Initiator Port. 1199 */ 1200 if (!isid) 1201 continue; 1202 if (strcmp(isid, pr_reg->pr_reg_isid)) 1203 continue; 1204 1205 atomic_inc_mb(&pr_reg->pr_res_holders); 1206 spin_unlock(&pr_tmpl->registration_lock); 1207 return pr_reg; 1208 } 1209 spin_unlock(&pr_tmpl->registration_lock); 1210 1211 return NULL; 1212 } 1213 1214 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1215 struct se_device *dev, 1216 struct se_node_acl *nacl, 1217 struct se_session *sess) 1218 { 1219 struct se_portal_group *tpg = nacl->se_tpg; 1220 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1221 1222 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1223 memset(&buf[0], 0, PR_REG_ISID_LEN); 1224 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1225 PR_REG_ISID_LEN); 1226 isid_ptr = &buf[0]; 1227 } 1228 1229 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1230 } 1231 1232 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1233 { 1234 atomic_dec_mb(&pr_reg->pr_res_holders); 1235 } 1236 1237 static int core_scsi3_check_implicit_release( 1238 struct se_device *dev, 1239 struct t10_pr_registration *pr_reg) 1240 { 1241 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1242 struct t10_pr_registration *pr_res_holder; 1243 int ret = 0; 1244 1245 spin_lock(&dev->dev_reservation_lock); 1246 pr_res_holder = dev->dev_pr_res_holder; 1247 if (!pr_res_holder) { 1248 spin_unlock(&dev->dev_reservation_lock); 1249 return ret; 1250 } 1251 if (pr_res_holder == pr_reg) { 1252 /* 1253 * Perform an implicit RELEASE if the registration that 1254 * is being released is holding the reservation. 1255 * 1256 * From spc4r17, section 5.7.11.1: 1257 * 1258 * e) If the I_T nexus is the persistent reservation holder 1259 * and the persistent reservation is not an all registrants 1260 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1261 * service action or REGISTER AND IGNORE EXISTING KEY 1262 * service action with the SERVICE ACTION RESERVATION KEY 1263 * field set to zero (see 5.7.11.3). 1264 */ 1265 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1266 ret = 1; 1267 /* 1268 * For 'All Registrants' reservation types, all existing 1269 * registrations are still processed as reservation holders 1270 * in core_scsi3_pr_seq_non_holder() after the initial 1271 * reservation holder is implicitly released here. 1272 */ 1273 } else if (pr_reg->pr_reg_all_tg_pt && 1274 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1275 pr_reg->pr_reg_nacl->initiatorname)) && 1276 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1277 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1278 " UNREGISTER while existing reservation with matching" 1279 " key 0x%016Lx is present from another SCSI Initiator" 1280 " Port\n", pr_reg->pr_res_key); 1281 ret = -EPERM; 1282 } 1283 spin_unlock(&dev->dev_reservation_lock); 1284 1285 return ret; 1286 } 1287 1288 /* 1289 * Called with struct t10_reservation->registration_lock held. 1290 */ 1291 static void __core_scsi3_free_registration( 1292 struct se_device *dev, 1293 struct t10_pr_registration *pr_reg, 1294 struct list_head *preempt_and_abort_list, 1295 int dec_holders) 1296 __releases(&pr_tmpl->registration_lock) 1297 __acquires(&pr_tmpl->registration_lock) 1298 { 1299 const struct target_core_fabric_ops *tfo = 1300 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1301 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1302 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1303 struct se_dev_entry *deve; 1304 char i_buf[PR_REG_ISID_ID_LEN]; 1305 1306 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1307 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1308 1309 if (!list_empty(&pr_reg->pr_reg_list)) 1310 list_del(&pr_reg->pr_reg_list); 1311 /* 1312 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1313 * so call core_scsi3_put_pr_reg() to decrement our reference. 1314 */ 1315 if (dec_holders) 1316 core_scsi3_put_pr_reg(pr_reg); 1317 1318 spin_unlock(&pr_tmpl->registration_lock); 1319 /* 1320 * Wait until all reference from any other I_T nexuses for this 1321 * *pr_reg have been released. Because list_del() is called above, 1322 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1323 * count back to zero, and we release *pr_reg. 1324 */ 1325 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1326 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1327 tfo->get_fabric_name()); 1328 cpu_relax(); 1329 } 1330 1331 rcu_read_lock(); 1332 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1333 if (deve) 1334 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1335 rcu_read_unlock(); 1336 1337 spin_lock(&pr_tmpl->registration_lock); 1338 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1339 " Node: %s%s\n", tfo->get_fabric_name(), 1340 pr_reg->pr_reg_nacl->initiatorname, 1341 i_buf); 1342 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1343 " Port(s)\n", tfo->get_fabric_name(), 1344 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1345 dev->transport->name); 1346 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1347 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1348 pr_reg->pr_res_generation); 1349 1350 if (!preempt_and_abort_list) { 1351 pr_reg->pr_reg_deve = NULL; 1352 pr_reg->pr_reg_nacl = NULL; 1353 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1354 return; 1355 } 1356 /* 1357 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1358 * are released once the ABORT_TASK_SET has completed.. 1359 */ 1360 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1361 } 1362 1363 void core_scsi3_free_pr_reg_from_nacl( 1364 struct se_device *dev, 1365 struct se_node_acl *nacl) 1366 { 1367 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1368 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1369 bool free_reg = false; 1370 /* 1371 * If the passed se_node_acl matches the reservation holder, 1372 * release the reservation. 1373 */ 1374 spin_lock(&dev->dev_reservation_lock); 1375 pr_res_holder = dev->dev_pr_res_holder; 1376 if ((pr_res_holder != NULL) && 1377 (pr_res_holder->pr_reg_nacl == nacl)) { 1378 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1379 free_reg = true; 1380 } 1381 spin_unlock(&dev->dev_reservation_lock); 1382 /* 1383 * Release any registration associated with the struct se_node_acl. 1384 */ 1385 spin_lock(&pr_tmpl->registration_lock); 1386 if (pr_res_holder && free_reg) 1387 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1388 1389 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1390 &pr_tmpl->registration_list, pr_reg_list) { 1391 1392 if (pr_reg->pr_reg_nacl != nacl) 1393 continue; 1394 1395 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1396 } 1397 spin_unlock(&pr_tmpl->registration_lock); 1398 } 1399 1400 void core_scsi3_free_all_registrations( 1401 struct se_device *dev) 1402 { 1403 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1404 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1405 1406 spin_lock(&dev->dev_reservation_lock); 1407 pr_res_holder = dev->dev_pr_res_holder; 1408 if (pr_res_holder != NULL) { 1409 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1410 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1411 pr_res_holder, 0, 0); 1412 } 1413 spin_unlock(&dev->dev_reservation_lock); 1414 1415 spin_lock(&pr_tmpl->registration_lock); 1416 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1417 &pr_tmpl->registration_list, pr_reg_list) { 1418 1419 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1420 } 1421 spin_unlock(&pr_tmpl->registration_lock); 1422 1423 spin_lock(&pr_tmpl->aptpl_reg_lock); 1424 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1425 pr_reg_aptpl_list) { 1426 list_del(&pr_reg->pr_reg_aptpl_list); 1427 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1428 } 1429 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1430 } 1431 1432 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1433 { 1434 return target_depend_item(&tpg->tpg_group.cg_item); 1435 } 1436 1437 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1438 { 1439 target_undepend_item(&tpg->tpg_group.cg_item); 1440 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1441 } 1442 1443 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1444 { 1445 if (nacl->dynamic_node_acl) 1446 return 0; 1447 return target_depend_item(&nacl->acl_group.cg_item); 1448 } 1449 1450 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1451 { 1452 if (!nacl->dynamic_node_acl) 1453 target_undepend_item(&nacl->acl_group.cg_item); 1454 atomic_dec_mb(&nacl->acl_pr_ref_count); 1455 } 1456 1457 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1458 { 1459 struct se_lun_acl *lun_acl; 1460 1461 /* 1462 * For nacl->dynamic_node_acl=1 1463 */ 1464 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1465 atomic_read(&se_deve->pr_kref.refcount) != 0); 1466 if (!lun_acl) 1467 return 0; 1468 1469 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1470 } 1471 1472 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1473 { 1474 struct se_lun_acl *lun_acl; 1475 1476 /* 1477 * For nacl->dynamic_node_acl=1 1478 */ 1479 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1480 atomic_read(&se_deve->pr_kref.refcount) != 0); 1481 if (!lun_acl) { 1482 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1483 return; 1484 } 1485 1486 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1487 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1488 } 1489 1490 static sense_reason_t 1491 core_scsi3_decode_spec_i_port( 1492 struct se_cmd *cmd, 1493 struct se_portal_group *tpg, 1494 unsigned char *l_isid, 1495 u64 sa_res_key, 1496 int all_tg_pt, 1497 int aptpl) 1498 { 1499 struct se_device *dev = cmd->se_dev; 1500 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1501 struct se_session *se_sess = cmd->se_sess; 1502 struct se_node_acl *dest_node_acl = NULL; 1503 struct se_dev_entry *dest_se_deve = NULL; 1504 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1505 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1506 LIST_HEAD(tid_dest_list); 1507 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1508 unsigned char *buf, *ptr, proto_ident; 1509 const unsigned char *i_str = NULL; 1510 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1511 sense_reason_t ret; 1512 u32 tpdl, tid_len = 0; 1513 u32 dest_rtpi = 0; 1514 1515 /* 1516 * Allocate a struct pr_transport_id_holder and setup the 1517 * local_node_acl pointer and add to struct list_head tid_dest_list 1518 * for add registration processing in the loop of tid_dest_list below. 1519 */ 1520 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1521 if (!tidh_new) { 1522 pr_err("Unable to allocate tidh_new\n"); 1523 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1524 } 1525 INIT_LIST_HEAD(&tidh_new->dest_list); 1526 tidh_new->dest_tpg = tpg; 1527 tidh_new->dest_node_acl = se_sess->se_node_acl; 1528 1529 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1530 se_sess->se_node_acl, cmd->se_lun, 1531 NULL, cmd->orig_fe_lun, l_isid, 1532 sa_res_key, all_tg_pt, aptpl); 1533 if (!local_pr_reg) { 1534 kfree(tidh_new); 1535 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1536 } 1537 tidh_new->dest_pr_reg = local_pr_reg; 1538 /* 1539 * The local I_T nexus does not hold any configfs dependances, 1540 * so we set tidh_new->dest_se_deve to NULL to prevent the 1541 * configfs_undepend_item() calls in the tid_dest_list loops below. 1542 */ 1543 tidh_new->dest_se_deve = NULL; 1544 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1545 1546 if (cmd->data_length < 28) { 1547 pr_warn("SPC-PR: Received PR OUT parameter list" 1548 " length too small: %u\n", cmd->data_length); 1549 ret = TCM_INVALID_PARAMETER_LIST; 1550 goto out; 1551 } 1552 1553 buf = transport_kmap_data_sg(cmd); 1554 if (!buf) { 1555 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1556 goto out; 1557 } 1558 1559 /* 1560 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1561 * first extract TransportID Parameter Data Length, and make sure 1562 * the value matches up to the SCSI expected data transfer length. 1563 */ 1564 tpdl = (buf[24] & 0xff) << 24; 1565 tpdl |= (buf[25] & 0xff) << 16; 1566 tpdl |= (buf[26] & 0xff) << 8; 1567 tpdl |= buf[27] & 0xff; 1568 1569 if ((tpdl + 28) != cmd->data_length) { 1570 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1571 " does not equal CDB data_length: %u\n", tpdl, 1572 cmd->data_length); 1573 ret = TCM_INVALID_PARAMETER_LIST; 1574 goto out_unmap; 1575 } 1576 /* 1577 * Start processing the received transport IDs using the 1578 * receiving I_T Nexus portal's fabric dependent methods to 1579 * obtain the SCSI Initiator Port/Device Identifiers. 1580 */ 1581 ptr = &buf[28]; 1582 1583 while (tpdl > 0) { 1584 struct se_lun *dest_lun, *tmp_lun; 1585 1586 proto_ident = (ptr[0] & 0x0f); 1587 dest_tpg = NULL; 1588 1589 spin_lock(&dev->se_port_lock); 1590 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1591 tmp_tpg = tmp_lun->lun_tpg; 1592 1593 /* 1594 * Look for the matching proto_ident provided by 1595 * the received TransportID 1596 */ 1597 if (tmp_tpg->proto_id != proto_ident) 1598 continue; 1599 dest_rtpi = tmp_lun->lun_rtpi; 1600 1601 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1602 (const char *)ptr, &tid_len, &iport_ptr); 1603 if (!i_str) 1604 continue; 1605 1606 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1607 spin_unlock(&dev->se_port_lock); 1608 1609 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1610 pr_err(" core_scsi3_tpg_depend_item()" 1611 " for tmp_tpg\n"); 1612 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1613 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1614 goto out_unmap; 1615 } 1616 /* 1617 * Locate the destination initiator ACL to be registered 1618 * from the decoded fabric module specific TransportID 1619 * at *i_str. 1620 */ 1621 mutex_lock(&tmp_tpg->acl_node_mutex); 1622 dest_node_acl = __core_tpg_get_initiator_node_acl( 1623 tmp_tpg, i_str); 1624 if (dest_node_acl) 1625 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1626 mutex_unlock(&tmp_tpg->acl_node_mutex); 1627 1628 if (!dest_node_acl) { 1629 core_scsi3_tpg_undepend_item(tmp_tpg); 1630 spin_lock(&dev->se_port_lock); 1631 continue; 1632 } 1633 1634 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1635 pr_err("configfs_depend_item() failed" 1636 " for dest_node_acl->acl_group\n"); 1637 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1638 core_scsi3_tpg_undepend_item(tmp_tpg); 1639 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1640 goto out_unmap; 1641 } 1642 1643 dest_tpg = tmp_tpg; 1644 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1645 " %s Port RTPI: %hu\n", 1646 dest_tpg->se_tpg_tfo->get_fabric_name(), 1647 dest_node_acl->initiatorname, dest_rtpi); 1648 1649 spin_lock(&dev->se_port_lock); 1650 break; 1651 } 1652 spin_unlock(&dev->se_port_lock); 1653 1654 if (!dest_tpg) { 1655 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1656 " dest_tpg\n"); 1657 ret = TCM_INVALID_PARAMETER_LIST; 1658 goto out_unmap; 1659 } 1660 1661 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1662 " tid_len: %d for %s + %s\n", 1663 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1664 tpdl, tid_len, i_str, iport_ptr); 1665 1666 if (tid_len > tpdl) { 1667 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1668 " %u for Transport ID: %s\n", tid_len, ptr); 1669 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1670 core_scsi3_tpg_undepend_item(dest_tpg); 1671 ret = TCM_INVALID_PARAMETER_LIST; 1672 goto out_unmap; 1673 } 1674 /* 1675 * Locate the desintation struct se_dev_entry pointer for matching 1676 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1677 * Target Port. 1678 */ 1679 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1680 dest_rtpi); 1681 if (!dest_se_deve) { 1682 pr_err("Unable to locate %s dest_se_deve" 1683 " from destination RTPI: %hu\n", 1684 dest_tpg->se_tpg_tfo->get_fabric_name(), 1685 dest_rtpi); 1686 1687 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1688 core_scsi3_tpg_undepend_item(dest_tpg); 1689 ret = TCM_INVALID_PARAMETER_LIST; 1690 goto out_unmap; 1691 } 1692 1693 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1694 pr_err("core_scsi3_lunacl_depend_item()" 1695 " failed\n"); 1696 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1697 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1698 core_scsi3_tpg_undepend_item(dest_tpg); 1699 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1700 goto out_unmap; 1701 } 1702 1703 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1704 " dest_se_deve mapped_lun: %llu\n", 1705 dest_tpg->se_tpg_tfo->get_fabric_name(), 1706 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1707 1708 /* 1709 * Skip any TransportIDs that already have a registration for 1710 * this target port. 1711 */ 1712 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1713 iport_ptr); 1714 if (pr_reg_e) { 1715 core_scsi3_put_pr_reg(pr_reg_e); 1716 core_scsi3_lunacl_undepend_item(dest_se_deve); 1717 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1718 core_scsi3_tpg_undepend_item(dest_tpg); 1719 ptr += tid_len; 1720 tpdl -= tid_len; 1721 tid_len = 0; 1722 continue; 1723 } 1724 /* 1725 * Allocate a struct pr_transport_id_holder and setup 1726 * the dest_node_acl and dest_se_deve pointers for the 1727 * loop below. 1728 */ 1729 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1730 GFP_KERNEL); 1731 if (!tidh_new) { 1732 pr_err("Unable to allocate tidh_new\n"); 1733 core_scsi3_lunacl_undepend_item(dest_se_deve); 1734 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1735 core_scsi3_tpg_undepend_item(dest_tpg); 1736 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1737 goto out_unmap; 1738 } 1739 INIT_LIST_HEAD(&tidh_new->dest_list); 1740 tidh_new->dest_tpg = dest_tpg; 1741 tidh_new->dest_node_acl = dest_node_acl; 1742 tidh_new->dest_se_deve = dest_se_deve; 1743 1744 /* 1745 * Allocate, but do NOT add the registration for the 1746 * TransportID referenced SCSI Initiator port. This 1747 * done because of the following from spc4r17 in section 1748 * 6.14.3 wrt SPEC_I_PT: 1749 * 1750 * "If a registration fails for any initiator port (e.g., if th 1751 * logical unit does not have enough resources available to 1752 * hold the registration information), no registrations shall be 1753 * made, and the command shall be terminated with 1754 * CHECK CONDITION status." 1755 * 1756 * That means we call __core_scsi3_alloc_registration() here, 1757 * and then call __core_scsi3_add_registration() in the 1758 * 2nd loop which will never fail. 1759 */ 1760 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1761 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 1762 1763 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1764 dest_node_acl, dest_lun, dest_se_deve, 1765 dest_se_deve->mapped_lun, iport_ptr, 1766 sa_res_key, all_tg_pt, aptpl); 1767 if (!dest_pr_reg) { 1768 core_scsi3_lunacl_undepend_item(dest_se_deve); 1769 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1770 core_scsi3_tpg_undepend_item(dest_tpg); 1771 kfree(tidh_new); 1772 ret = TCM_INVALID_PARAMETER_LIST; 1773 goto out_unmap; 1774 } 1775 tidh_new->dest_pr_reg = dest_pr_reg; 1776 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1777 1778 ptr += tid_len; 1779 tpdl -= tid_len; 1780 tid_len = 0; 1781 1782 } 1783 1784 transport_kunmap_data_sg(cmd); 1785 1786 /* 1787 * Go ahead and create a registrations from tid_dest_list for the 1788 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1789 * and dest_se_deve. 1790 * 1791 * The SA Reservation Key from the PROUT is set for the 1792 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1793 * means that the TransportID Initiator port will be 1794 * registered on all of the target ports in the SCSI target device 1795 * ALL_TG_PT=0 means the registration will only be for the 1796 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1797 * was received. 1798 */ 1799 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1800 dest_tpg = tidh->dest_tpg; 1801 dest_node_acl = tidh->dest_node_acl; 1802 dest_se_deve = tidh->dest_se_deve; 1803 dest_pr_reg = tidh->dest_pr_reg; 1804 1805 list_del(&tidh->dest_list); 1806 kfree(tidh); 1807 1808 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1809 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1810 1811 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1812 dest_pr_reg, 0, 0); 1813 1814 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1815 " registered Transport ID for Node: %s%s Mapped LUN:" 1816 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1817 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1818 dest_se_deve->mapped_lun : 0); 1819 1820 if (!dest_se_deve) { 1821 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1822 target_pr_kref_release); 1823 continue; 1824 } 1825 core_scsi3_lunacl_undepend_item(dest_se_deve); 1826 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1827 core_scsi3_tpg_undepend_item(dest_tpg); 1828 } 1829 1830 return 0; 1831 out_unmap: 1832 transport_kunmap_data_sg(cmd); 1833 out: 1834 /* 1835 * For the failure case, release everything from tid_dest_list 1836 * including *dest_pr_reg and the configfs dependances.. 1837 */ 1838 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1839 dest_tpg = tidh->dest_tpg; 1840 dest_node_acl = tidh->dest_node_acl; 1841 dest_se_deve = tidh->dest_se_deve; 1842 dest_pr_reg = tidh->dest_pr_reg; 1843 1844 list_del(&tidh->dest_list); 1845 kfree(tidh); 1846 /* 1847 * Release any extra ALL_TG_PT=1 registrations for 1848 * the SPEC_I_PT=1 case. 1849 */ 1850 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1851 &dest_pr_reg->pr_reg_atp_list, 1852 pr_reg_atp_mem_list) { 1853 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1854 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1855 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1856 } 1857 1858 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1859 1860 if (!dest_se_deve) { 1861 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1862 target_pr_kref_release); 1863 continue; 1864 } 1865 core_scsi3_lunacl_undepend_item(dest_se_deve); 1866 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1867 core_scsi3_tpg_undepend_item(dest_tpg); 1868 } 1869 return ret; 1870 } 1871 1872 static int core_scsi3_update_aptpl_buf( 1873 struct se_device *dev, 1874 unsigned char *buf, 1875 u32 pr_aptpl_buf_len) 1876 { 1877 struct se_portal_group *tpg; 1878 struct t10_pr_registration *pr_reg; 1879 unsigned char tmp[512], isid_buf[32]; 1880 ssize_t len = 0; 1881 int reg_count = 0; 1882 int ret = 0; 1883 1884 spin_lock(&dev->dev_reservation_lock); 1885 spin_lock(&dev->t10_pr.registration_lock); 1886 /* 1887 * Walk the registration list.. 1888 */ 1889 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1890 pr_reg_list) { 1891 1892 tmp[0] = '\0'; 1893 isid_buf[0] = '\0'; 1894 tpg = pr_reg->pr_reg_nacl->se_tpg; 1895 /* 1896 * Write out any ISID value to APTPL metadata that was included 1897 * in the original registration. 1898 */ 1899 if (pr_reg->isid_present_at_reg) 1900 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1901 pr_reg->pr_reg_isid); 1902 /* 1903 * Include special metadata if the pr_reg matches the 1904 * reservation holder. 1905 */ 1906 if (dev->dev_pr_res_holder == pr_reg) { 1907 snprintf(tmp, 512, "PR_REG_START: %d" 1908 "\ninitiator_fabric=%s\n" 1909 "initiator_node=%s\n%s" 1910 "sa_res_key=%llu\n" 1911 "res_holder=1\nres_type=%02x\n" 1912 "res_scope=%02x\nres_all_tg_pt=%d\n" 1913 "mapped_lun=%llu\n", reg_count, 1914 tpg->se_tpg_tfo->get_fabric_name(), 1915 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1916 pr_reg->pr_res_key, pr_reg->pr_res_type, 1917 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1918 pr_reg->pr_res_mapped_lun); 1919 } else { 1920 snprintf(tmp, 512, "PR_REG_START: %d\n" 1921 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1922 "sa_res_key=%llu\nres_holder=0\n" 1923 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1924 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1925 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1926 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1927 pr_reg->pr_res_mapped_lun); 1928 } 1929 1930 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1931 pr_err("Unable to update renaming APTPL metadata," 1932 " reallocating larger buffer\n"); 1933 ret = -EMSGSIZE; 1934 goto out; 1935 } 1936 len += sprintf(buf+len, "%s", tmp); 1937 1938 /* 1939 * Include information about the associated SCSI target port. 1940 */ 1941 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1942 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1943 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1944 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1945 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1946 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1947 reg_count); 1948 1949 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1950 pr_err("Unable to update renaming APTPL metadata," 1951 " reallocating larger buffer\n"); 1952 ret = -EMSGSIZE; 1953 goto out; 1954 } 1955 len += sprintf(buf+len, "%s", tmp); 1956 reg_count++; 1957 } 1958 1959 if (!reg_count) 1960 len += sprintf(buf+len, "No Registrations or Reservations"); 1961 1962 out: 1963 spin_unlock(&dev->t10_pr.registration_lock); 1964 spin_unlock(&dev->dev_reservation_lock); 1965 1966 return ret; 1967 } 1968 1969 static int __core_scsi3_write_aptpl_to_file( 1970 struct se_device *dev, 1971 unsigned char *buf) 1972 { 1973 struct t10_wwn *wwn = &dev->t10_wwn; 1974 struct file *file; 1975 int flags = O_RDWR | O_CREAT | O_TRUNC; 1976 char path[512]; 1977 u32 pr_aptpl_buf_len; 1978 int ret; 1979 1980 memset(path, 0, 512); 1981 1982 if (strlen(&wwn->unit_serial[0]) >= 512) { 1983 pr_err("WWN value for struct se_device does not fit" 1984 " into path buffer\n"); 1985 return -EMSGSIZE; 1986 } 1987 1988 snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); 1989 file = filp_open(path, flags, 0600); 1990 if (IS_ERR(file)) { 1991 pr_err("filp_open(%s) for APTPL metadata" 1992 " failed\n", path); 1993 return PTR_ERR(file); 1994 } 1995 1996 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1997 1998 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1999 2000 if (ret < 0) 2001 pr_debug("Error writing APTPL metadata file: %s\n", path); 2002 fput(file); 2003 2004 return (ret < 0) ? -EIO : 0; 2005 } 2006 2007 /* 2008 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2009 * write out the updated metadata to struct file for this SCSI device. 2010 */ 2011 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2012 { 2013 unsigned char *buf; 2014 int rc, len = PR_APTPL_BUF_LEN; 2015 2016 if (!aptpl) { 2017 char *null_buf = "No Registrations or Reservations\n"; 2018 2019 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2020 dev->t10_pr.pr_aptpl_active = 0; 2021 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2022 2023 if (rc) 2024 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2025 2026 return 0; 2027 } 2028 retry: 2029 buf = vzalloc(len); 2030 if (!buf) 2031 return TCM_OUT_OF_RESOURCES; 2032 2033 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2034 if (rc < 0) { 2035 vfree(buf); 2036 len *= 2; 2037 goto retry; 2038 } 2039 2040 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2041 if (rc != 0) { 2042 pr_err("SPC-3 PR: Could not update APTPL\n"); 2043 vfree(buf); 2044 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2045 } 2046 dev->t10_pr.pr_aptpl_active = 1; 2047 vfree(buf); 2048 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2049 return 0; 2050 } 2051 2052 static sense_reason_t 2053 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2054 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2055 { 2056 struct se_session *se_sess = cmd->se_sess; 2057 struct se_device *dev = cmd->se_dev; 2058 struct se_lun *se_lun = cmd->se_lun; 2059 struct se_portal_group *se_tpg; 2060 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2061 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2062 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2063 sense_reason_t ret = TCM_NO_SENSE; 2064 int pr_holder = 0, type; 2065 2066 if (!se_sess || !se_lun) { 2067 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2068 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2069 } 2070 se_tpg = se_sess->se_tpg; 2071 2072 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2073 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2074 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2075 PR_REG_ISID_LEN); 2076 isid_ptr = &isid_buf[0]; 2077 } 2078 /* 2079 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2080 */ 2081 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2082 if (!pr_reg) { 2083 if (res_key) { 2084 pr_warn("SPC-3 PR: Reservation Key non-zero" 2085 " for SA REGISTER, returning CONFLICT\n"); 2086 return TCM_RESERVATION_CONFLICT; 2087 } 2088 /* 2089 * Do nothing but return GOOD status. 2090 */ 2091 if (!sa_res_key) 2092 return 0; 2093 2094 if (!spec_i_pt) { 2095 /* 2096 * Perform the Service Action REGISTER on the Initiator 2097 * Port Endpoint that the PRO was received from on the 2098 * Logical Unit of the SCSI device server. 2099 */ 2100 if (core_scsi3_alloc_registration(cmd->se_dev, 2101 se_sess->se_node_acl, cmd->se_lun, 2102 NULL, cmd->orig_fe_lun, isid_ptr, 2103 sa_res_key, all_tg_pt, aptpl, 2104 register_type, 0)) { 2105 pr_err("Unable to allocate" 2106 " struct t10_pr_registration\n"); 2107 return TCM_INVALID_PARAMETER_LIST; 2108 } 2109 } else { 2110 /* 2111 * Register both the Initiator port that received 2112 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2113 * TransportID from Parameter list and loop through 2114 * fabric dependent parameter list while calling 2115 * logic from of core_scsi3_alloc_registration() for 2116 * each TransportID provided SCSI Initiator Port/Device 2117 */ 2118 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2119 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2120 if (ret != 0) 2121 return ret; 2122 } 2123 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2124 } 2125 2126 /* ok, existing registration */ 2127 2128 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2129 pr_err("SPC-3 PR REGISTER: Received" 2130 " res_key: 0x%016Lx does not match" 2131 " existing SA REGISTER res_key:" 2132 " 0x%016Lx\n", res_key, 2133 pr_reg->pr_res_key); 2134 ret = TCM_RESERVATION_CONFLICT; 2135 goto out; 2136 } 2137 2138 if (spec_i_pt) { 2139 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2140 " set on a registered nexus\n"); 2141 ret = TCM_INVALID_PARAMETER_LIST; 2142 goto out; 2143 } 2144 2145 /* 2146 * An existing ALL_TG_PT=1 registration being released 2147 * must also set ALL_TG_PT=1 in the incoming PROUT. 2148 */ 2149 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2150 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2151 " registration exists, but ALL_TG_PT=1 bit not" 2152 " present in received PROUT\n"); 2153 ret = TCM_INVALID_CDB_FIELD; 2154 goto out; 2155 } 2156 2157 /* 2158 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2159 */ 2160 if (sa_res_key) { 2161 /* 2162 * Increment PRgeneration counter for struct se_device" 2163 * upon a successful REGISTER, see spc4r17 section 6.3.2 2164 * READ_KEYS service action. 2165 */ 2166 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2167 pr_reg->pr_res_key = sa_res_key; 2168 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2169 " Key for %s to: 0x%016Lx PRgeneration:" 2170 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2171 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2172 pr_reg->pr_reg_nacl->initiatorname, 2173 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2174 2175 } else { 2176 /* 2177 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2178 */ 2179 type = pr_reg->pr_res_type; 2180 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2181 pr_reg); 2182 if (pr_holder < 0) { 2183 ret = TCM_RESERVATION_CONFLICT; 2184 goto out; 2185 } 2186 2187 spin_lock(&pr_tmpl->registration_lock); 2188 /* 2189 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2190 * and matching pr_res_key. 2191 */ 2192 if (pr_reg->pr_reg_all_tg_pt) { 2193 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2194 &pr_tmpl->registration_list, 2195 pr_reg_list) { 2196 2197 if (!pr_reg_p->pr_reg_all_tg_pt) 2198 continue; 2199 if (pr_reg_p->pr_res_key != res_key) 2200 continue; 2201 if (pr_reg == pr_reg_p) 2202 continue; 2203 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2204 pr_reg_p->pr_reg_nacl->initiatorname)) 2205 continue; 2206 2207 __core_scsi3_free_registration(dev, 2208 pr_reg_p, NULL, 0); 2209 } 2210 } 2211 2212 /* 2213 * Release the calling I_T Nexus registration now.. 2214 */ 2215 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2216 pr_reg = NULL; 2217 2218 /* 2219 * From spc4r17, section 5.7.11.3 Unregistering 2220 * 2221 * If the persistent reservation is a registrants only 2222 * type, the device server shall establish a unit 2223 * attention condition for the initiator port associated 2224 * with every registered I_T nexus except for the I_T 2225 * nexus on which the PERSISTENT RESERVE OUT command was 2226 * received, with the additional sense code set to 2227 * RESERVATIONS RELEASED. 2228 */ 2229 if (pr_holder && 2230 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2231 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2232 list_for_each_entry(pr_reg_p, 2233 &pr_tmpl->registration_list, 2234 pr_reg_list) { 2235 2236 target_ua_allocate_lun( 2237 pr_reg_p->pr_reg_nacl, 2238 pr_reg_p->pr_res_mapped_lun, 2239 0x2A, 2240 ASCQ_2AH_RESERVATIONS_RELEASED); 2241 } 2242 } 2243 2244 spin_unlock(&pr_tmpl->registration_lock); 2245 } 2246 2247 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2248 2249 out: 2250 if (pr_reg) 2251 core_scsi3_put_pr_reg(pr_reg); 2252 return ret; 2253 } 2254 2255 unsigned char *core_scsi3_pr_dump_type(int type) 2256 { 2257 switch (type) { 2258 case PR_TYPE_WRITE_EXCLUSIVE: 2259 return "Write Exclusive Access"; 2260 case PR_TYPE_EXCLUSIVE_ACCESS: 2261 return "Exclusive Access"; 2262 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2263 return "Write Exclusive Access, Registrants Only"; 2264 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2265 return "Exclusive Access, Registrants Only"; 2266 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2267 return "Write Exclusive Access, All Registrants"; 2268 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2269 return "Exclusive Access, All Registrants"; 2270 default: 2271 break; 2272 } 2273 2274 return "Unknown SPC-3 PR Type"; 2275 } 2276 2277 static sense_reason_t 2278 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2279 { 2280 struct se_device *dev = cmd->se_dev; 2281 struct se_session *se_sess = cmd->se_sess; 2282 struct se_lun *se_lun = cmd->se_lun; 2283 struct t10_pr_registration *pr_reg, *pr_res_holder; 2284 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2285 char i_buf[PR_REG_ISID_ID_LEN]; 2286 sense_reason_t ret; 2287 2288 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2289 2290 if (!se_sess || !se_lun) { 2291 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2293 } 2294 /* 2295 * Locate the existing *pr_reg via struct se_node_acl pointers 2296 */ 2297 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2298 se_sess); 2299 if (!pr_reg) { 2300 pr_err("SPC-3 PR: Unable to locate" 2301 " PR_REGISTERED *pr_reg for RESERVE\n"); 2302 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2303 } 2304 /* 2305 * From spc4r17 Section 5.7.9: Reserving: 2306 * 2307 * An application client creates a persistent reservation by issuing 2308 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2309 * a registered I_T nexus with the following parameters: 2310 * a) RESERVATION KEY set to the value of the reservation key that is 2311 * registered with the logical unit for the I_T nexus; and 2312 */ 2313 if (res_key != pr_reg->pr_res_key) { 2314 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2315 " does not match existing SA REGISTER res_key:" 2316 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2317 ret = TCM_RESERVATION_CONFLICT; 2318 goto out_put_pr_reg; 2319 } 2320 /* 2321 * From spc4r17 Section 5.7.9: Reserving: 2322 * 2323 * From above: 2324 * b) TYPE field and SCOPE field set to the persistent reservation 2325 * being created. 2326 * 2327 * Only one persistent reservation is allowed at a time per logical unit 2328 * and that persistent reservation has a scope of LU_SCOPE. 2329 */ 2330 if (scope != PR_SCOPE_LU_SCOPE) { 2331 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2332 ret = TCM_INVALID_PARAMETER_LIST; 2333 goto out_put_pr_reg; 2334 } 2335 /* 2336 * See if we have an existing PR reservation holder pointer at 2337 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2338 * *pr_res_holder. 2339 */ 2340 spin_lock(&dev->dev_reservation_lock); 2341 pr_res_holder = dev->dev_pr_res_holder; 2342 if (pr_res_holder) { 2343 /* 2344 * From spc4r17 Section 5.7.9: Reserving: 2345 * 2346 * If the device server receives a PERSISTENT RESERVE OUT 2347 * command from an I_T nexus other than a persistent reservation 2348 * holder (see 5.7.10) that attempts to create a persistent 2349 * reservation when a persistent reservation already exists for 2350 * the logical unit, then the command shall be completed with 2351 * RESERVATION CONFLICT status. 2352 */ 2353 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2354 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2355 pr_err("SPC-3 PR: Attempted RESERVE from" 2356 " [%s]: %s while reservation already held by" 2357 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2358 cmd->se_tfo->get_fabric_name(), 2359 se_sess->se_node_acl->initiatorname, 2360 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2361 pr_res_holder->pr_reg_nacl->initiatorname); 2362 2363 spin_unlock(&dev->dev_reservation_lock); 2364 ret = TCM_RESERVATION_CONFLICT; 2365 goto out_put_pr_reg; 2366 } 2367 /* 2368 * From spc4r17 Section 5.7.9: Reserving: 2369 * 2370 * If a persistent reservation holder attempts to modify the 2371 * type or scope of an existing persistent reservation, the 2372 * command shall be completed with RESERVATION CONFLICT status. 2373 */ 2374 if ((pr_res_holder->pr_res_type != type) || 2375 (pr_res_holder->pr_res_scope != scope)) { 2376 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2377 pr_err("SPC-3 PR: Attempted RESERVE from" 2378 " [%s]: %s trying to change TYPE and/or SCOPE," 2379 " while reservation already held by [%s]: %s," 2380 " returning RESERVATION_CONFLICT\n", 2381 cmd->se_tfo->get_fabric_name(), 2382 se_sess->se_node_acl->initiatorname, 2383 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2384 pr_res_holder->pr_reg_nacl->initiatorname); 2385 2386 spin_unlock(&dev->dev_reservation_lock); 2387 ret = TCM_RESERVATION_CONFLICT; 2388 goto out_put_pr_reg; 2389 } 2390 /* 2391 * From spc4r17 Section 5.7.9: Reserving: 2392 * 2393 * If the device server receives a PERSISTENT RESERVE OUT 2394 * command with RESERVE service action where the TYPE field and 2395 * the SCOPE field contain the same values as the existing type 2396 * and scope from a persistent reservation holder, it shall not 2397 * make any change to the existing persistent reservation and 2398 * shall completethe command with GOOD status. 2399 */ 2400 spin_unlock(&dev->dev_reservation_lock); 2401 ret = 0; 2402 goto out_put_pr_reg; 2403 } 2404 /* 2405 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2406 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2407 */ 2408 pr_reg->pr_res_scope = scope; 2409 pr_reg->pr_res_type = type; 2410 pr_reg->pr_res_holder = 1; 2411 dev->dev_pr_res_holder = pr_reg; 2412 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2413 2414 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2415 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2416 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2417 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2418 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2419 cmd->se_tfo->get_fabric_name(), 2420 se_sess->se_node_acl->initiatorname, 2421 i_buf); 2422 spin_unlock(&dev->dev_reservation_lock); 2423 2424 if (pr_tmpl->pr_aptpl_active) 2425 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2426 2427 ret = 0; 2428 out_put_pr_reg: 2429 core_scsi3_put_pr_reg(pr_reg); 2430 return ret; 2431 } 2432 2433 static sense_reason_t 2434 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2435 u64 res_key) 2436 { 2437 switch (type) { 2438 case PR_TYPE_WRITE_EXCLUSIVE: 2439 case PR_TYPE_EXCLUSIVE_ACCESS: 2440 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2441 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2442 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2443 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2444 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2445 default: 2446 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2447 " 0x%02x\n", type); 2448 return TCM_INVALID_CDB_FIELD; 2449 } 2450 } 2451 2452 /* 2453 * Called with struct se_device->dev_reservation_lock held. 2454 */ 2455 static void __core_scsi3_complete_pro_release( 2456 struct se_device *dev, 2457 struct se_node_acl *se_nacl, 2458 struct t10_pr_registration *pr_reg, 2459 int explicit, 2460 int unreg) 2461 { 2462 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2463 char i_buf[PR_REG_ISID_ID_LEN]; 2464 int pr_res_type = 0, pr_res_scope = 0; 2465 2466 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2467 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2468 /* 2469 * Go ahead and release the current PR reservation holder. 2470 * If an All Registrants reservation is currently active and 2471 * a unregister operation is requested, replace the current 2472 * dev_pr_res_holder with another active registration. 2473 */ 2474 if (dev->dev_pr_res_holder) { 2475 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2476 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2477 dev->dev_pr_res_holder->pr_res_type = 0; 2478 dev->dev_pr_res_holder->pr_res_scope = 0; 2479 dev->dev_pr_res_holder->pr_res_holder = 0; 2480 dev->dev_pr_res_holder = NULL; 2481 } 2482 if (!unreg) 2483 goto out; 2484 2485 spin_lock(&dev->t10_pr.registration_lock); 2486 list_del_init(&pr_reg->pr_reg_list); 2487 /* 2488 * If the I_T nexus is a reservation holder, the persistent reservation 2489 * is of an all registrants type, and the I_T nexus is the last remaining 2490 * registered I_T nexus, then the device server shall also release the 2491 * persistent reservation. 2492 */ 2493 if (!list_empty(&dev->t10_pr.registration_list) && 2494 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2495 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2496 dev->dev_pr_res_holder = 2497 list_entry(dev->t10_pr.registration_list.next, 2498 struct t10_pr_registration, pr_reg_list); 2499 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2500 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2501 dev->dev_pr_res_holder->pr_res_holder = 1; 2502 } 2503 spin_unlock(&dev->t10_pr.registration_lock); 2504 out: 2505 if (!dev->dev_pr_res_holder) { 2506 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2507 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2508 tfo->get_fabric_name(), (explicit) ? "explicit" : 2509 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2510 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2511 } 2512 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2513 tfo->get_fabric_name(), se_nacl->initiatorname, 2514 i_buf); 2515 /* 2516 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2517 */ 2518 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2519 } 2520 2521 static sense_reason_t 2522 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2523 u64 res_key) 2524 { 2525 struct se_device *dev = cmd->se_dev; 2526 struct se_session *se_sess = cmd->se_sess; 2527 struct se_lun *se_lun = cmd->se_lun; 2528 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2529 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2530 sense_reason_t ret = 0; 2531 2532 if (!se_sess || !se_lun) { 2533 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2534 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2535 } 2536 /* 2537 * Locate the existing *pr_reg via struct se_node_acl pointers 2538 */ 2539 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2540 if (!pr_reg) { 2541 pr_err("SPC-3 PR: Unable to locate" 2542 " PR_REGISTERED *pr_reg for RELEASE\n"); 2543 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2544 } 2545 /* 2546 * From spc4r17 Section 5.7.11.2 Releasing: 2547 * 2548 * If there is no persistent reservation or in response to a persistent 2549 * reservation release request from a registered I_T nexus that is not a 2550 * persistent reservation holder (see 5.7.10), the device server shall 2551 * do the following: 2552 * 2553 * a) Not release the persistent reservation, if any; 2554 * b) Not remove any registrations; and 2555 * c) Complete the command with GOOD status. 2556 */ 2557 spin_lock(&dev->dev_reservation_lock); 2558 pr_res_holder = dev->dev_pr_res_holder; 2559 if (!pr_res_holder) { 2560 /* 2561 * No persistent reservation, return GOOD status. 2562 */ 2563 spin_unlock(&dev->dev_reservation_lock); 2564 goto out_put_pr_reg; 2565 } 2566 2567 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2568 /* 2569 * Release request from a registered I_T nexus that is not a 2570 * persistent reservation holder. return GOOD status. 2571 */ 2572 spin_unlock(&dev->dev_reservation_lock); 2573 goto out_put_pr_reg; 2574 } 2575 2576 /* 2577 * From spc4r17 Section 5.7.11.2 Releasing: 2578 * 2579 * Only the persistent reservation holder (see 5.7.10) is allowed to 2580 * release a persistent reservation. 2581 * 2582 * An application client releases the persistent reservation by issuing 2583 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2584 * an I_T nexus that is a persistent reservation holder with the 2585 * following parameters: 2586 * 2587 * a) RESERVATION KEY field set to the value of the reservation key 2588 * that is registered with the logical unit for the I_T nexus; 2589 */ 2590 if (res_key != pr_reg->pr_res_key) { 2591 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2592 " does not match existing SA REGISTER res_key:" 2593 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2594 spin_unlock(&dev->dev_reservation_lock); 2595 ret = TCM_RESERVATION_CONFLICT; 2596 goto out_put_pr_reg; 2597 } 2598 /* 2599 * From spc4r17 Section 5.7.11.2 Releasing and above: 2600 * 2601 * b) TYPE field and SCOPE field set to match the persistent 2602 * reservation being released. 2603 */ 2604 if ((pr_res_holder->pr_res_type != type) || 2605 (pr_res_holder->pr_res_scope != scope)) { 2606 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2607 pr_err("SPC-3 PR RELEASE: Attempted to release" 2608 " reservation from [%s]: %s with different TYPE " 2609 "and/or SCOPE while reservation already held by" 2610 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2611 cmd->se_tfo->get_fabric_name(), 2612 se_sess->se_node_acl->initiatorname, 2613 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2614 pr_res_holder->pr_reg_nacl->initiatorname); 2615 2616 spin_unlock(&dev->dev_reservation_lock); 2617 ret = TCM_RESERVATION_CONFLICT; 2618 goto out_put_pr_reg; 2619 } 2620 /* 2621 * In response to a persistent reservation release request from the 2622 * persistent reservation holder the device server shall perform a 2623 * release by doing the following as an uninterrupted series of actions: 2624 * a) Release the persistent reservation; 2625 * b) Not remove any registration(s); 2626 * c) If the released persistent reservation is a registrants only type 2627 * or all registrants type persistent reservation, 2628 * the device server shall establish a unit attention condition for 2629 * the initiator port associated with every regis- 2630 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2631 * RESERVE OUT command with RELEASE service action was received, 2632 * with the additional sense code set to RESERVATIONS RELEASED; and 2633 * d) If the persistent reservation is of any other type, the device 2634 * server shall not establish a unit attention condition. 2635 */ 2636 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2637 pr_reg, 1, 0); 2638 2639 spin_unlock(&dev->dev_reservation_lock); 2640 2641 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2642 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2643 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2644 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2645 /* 2646 * If no UNIT ATTENTION conditions will be established for 2647 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2648 * go ahead and check for APTPL=1 update+write below 2649 */ 2650 goto write_aptpl; 2651 } 2652 2653 spin_lock(&pr_tmpl->registration_lock); 2654 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2655 pr_reg_list) { 2656 /* 2657 * Do not establish a UNIT ATTENTION condition 2658 * for the calling I_T Nexus 2659 */ 2660 if (pr_reg_p == pr_reg) 2661 continue; 2662 2663 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2664 pr_reg_p->pr_res_mapped_lun, 2665 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2666 } 2667 spin_unlock(&pr_tmpl->registration_lock); 2668 2669 write_aptpl: 2670 if (pr_tmpl->pr_aptpl_active) 2671 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2672 2673 out_put_pr_reg: 2674 core_scsi3_put_pr_reg(pr_reg); 2675 return ret; 2676 } 2677 2678 static sense_reason_t 2679 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2680 { 2681 struct se_device *dev = cmd->se_dev; 2682 struct se_node_acl *pr_reg_nacl; 2683 struct se_session *se_sess = cmd->se_sess; 2684 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2685 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2686 u64 pr_res_mapped_lun = 0; 2687 int calling_it_nexus = 0; 2688 /* 2689 * Locate the existing *pr_reg via struct se_node_acl pointers 2690 */ 2691 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2692 se_sess->se_node_acl, se_sess); 2693 if (!pr_reg_n) { 2694 pr_err("SPC-3 PR: Unable to locate" 2695 " PR_REGISTERED *pr_reg for CLEAR\n"); 2696 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2697 } 2698 /* 2699 * From spc4r17 section 5.7.11.6, Clearing: 2700 * 2701 * Any application client may release the persistent reservation and 2702 * remove all registrations from a device server by issuing a 2703 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2704 * registered I_T nexus with the following parameter: 2705 * 2706 * a) RESERVATION KEY field set to the value of the reservation key 2707 * that is registered with the logical unit for the I_T nexus. 2708 */ 2709 if (res_key != pr_reg_n->pr_res_key) { 2710 pr_err("SPC-3 PR REGISTER: Received" 2711 " res_key: 0x%016Lx does not match" 2712 " existing SA REGISTER res_key:" 2713 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2714 core_scsi3_put_pr_reg(pr_reg_n); 2715 return TCM_RESERVATION_CONFLICT; 2716 } 2717 /* 2718 * a) Release the persistent reservation, if any; 2719 */ 2720 spin_lock(&dev->dev_reservation_lock); 2721 pr_res_holder = dev->dev_pr_res_holder; 2722 if (pr_res_holder) { 2723 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2724 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2725 pr_res_holder, 0, 0); 2726 } 2727 spin_unlock(&dev->dev_reservation_lock); 2728 /* 2729 * b) Remove all registration(s) (see spc4r17 5.7.7); 2730 */ 2731 spin_lock(&pr_tmpl->registration_lock); 2732 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2733 &pr_tmpl->registration_list, pr_reg_list) { 2734 2735 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2736 pr_reg_nacl = pr_reg->pr_reg_nacl; 2737 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2738 __core_scsi3_free_registration(dev, pr_reg, NULL, 2739 calling_it_nexus); 2740 /* 2741 * e) Establish a unit attention condition for the initiator 2742 * port associated with every registered I_T nexus other 2743 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2744 * command with CLEAR service action was received, with the 2745 * additional sense code set to RESERVATIONS PREEMPTED. 2746 */ 2747 if (!calling_it_nexus) 2748 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2749 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2750 } 2751 spin_unlock(&pr_tmpl->registration_lock); 2752 2753 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2754 cmd->se_tfo->get_fabric_name()); 2755 2756 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2757 2758 core_scsi3_pr_generation(dev); 2759 return 0; 2760 } 2761 2762 /* 2763 * Called with struct se_device->dev_reservation_lock held. 2764 */ 2765 static void __core_scsi3_complete_pro_preempt( 2766 struct se_device *dev, 2767 struct t10_pr_registration *pr_reg, 2768 struct list_head *preempt_and_abort_list, 2769 int type, 2770 int scope, 2771 enum preempt_type preempt_type) 2772 { 2773 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2774 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2775 char i_buf[PR_REG_ISID_ID_LEN]; 2776 2777 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2778 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2779 /* 2780 * Do an implicit RELEASE of the existing reservation. 2781 */ 2782 if (dev->dev_pr_res_holder) 2783 __core_scsi3_complete_pro_release(dev, nacl, 2784 dev->dev_pr_res_holder, 0, 0); 2785 2786 dev->dev_pr_res_holder = pr_reg; 2787 pr_reg->pr_res_holder = 1; 2788 pr_reg->pr_res_type = type; 2789 pr_reg->pr_res_scope = scope; 2790 2791 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2792 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2793 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2794 core_scsi3_pr_dump_type(type), 2795 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2796 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2797 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2798 nacl->initiatorname, i_buf); 2799 /* 2800 * For PREEMPT_AND_ABORT, add the preempting reservation's 2801 * struct t10_pr_registration to the list that will be compared 2802 * against received CDBs.. 2803 */ 2804 if (preempt_and_abort_list) 2805 list_add_tail(&pr_reg->pr_reg_abort_list, 2806 preempt_and_abort_list); 2807 } 2808 2809 static void core_scsi3_release_preempt_and_abort( 2810 struct list_head *preempt_and_abort_list, 2811 struct t10_pr_registration *pr_reg_holder) 2812 { 2813 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2814 2815 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2816 pr_reg_abort_list) { 2817 2818 list_del(&pr_reg->pr_reg_abort_list); 2819 if (pr_reg_holder == pr_reg) 2820 continue; 2821 if (pr_reg->pr_res_holder) { 2822 pr_warn("pr_reg->pr_res_holder still set\n"); 2823 continue; 2824 } 2825 2826 pr_reg->pr_reg_deve = NULL; 2827 pr_reg->pr_reg_nacl = NULL; 2828 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2829 } 2830 } 2831 2832 static sense_reason_t 2833 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2834 u64 sa_res_key, enum preempt_type preempt_type) 2835 { 2836 struct se_device *dev = cmd->se_dev; 2837 struct se_node_acl *pr_reg_nacl; 2838 struct se_session *se_sess = cmd->se_sess; 2839 LIST_HEAD(preempt_and_abort_list); 2840 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2841 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2842 u64 pr_res_mapped_lun = 0; 2843 int all_reg = 0, calling_it_nexus = 0; 2844 bool sa_res_key_unmatched = sa_res_key != 0; 2845 int prh_type = 0, prh_scope = 0; 2846 2847 if (!se_sess) 2848 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2849 2850 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2851 se_sess); 2852 if (!pr_reg_n) { 2853 pr_err("SPC-3 PR: Unable to locate" 2854 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2855 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2856 return TCM_RESERVATION_CONFLICT; 2857 } 2858 if (pr_reg_n->pr_res_key != res_key) { 2859 core_scsi3_put_pr_reg(pr_reg_n); 2860 return TCM_RESERVATION_CONFLICT; 2861 } 2862 if (scope != PR_SCOPE_LU_SCOPE) { 2863 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2864 core_scsi3_put_pr_reg(pr_reg_n); 2865 return TCM_INVALID_PARAMETER_LIST; 2866 } 2867 2868 spin_lock(&dev->dev_reservation_lock); 2869 pr_res_holder = dev->dev_pr_res_holder; 2870 if (pr_res_holder && 2871 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2872 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2873 all_reg = 1; 2874 2875 if (!all_reg && !sa_res_key) { 2876 spin_unlock(&dev->dev_reservation_lock); 2877 core_scsi3_put_pr_reg(pr_reg_n); 2878 return TCM_INVALID_PARAMETER_LIST; 2879 } 2880 /* 2881 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2882 * 2883 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2884 * persistent reservation holder or there is no persistent reservation 2885 * holder (i.e., there is no persistent reservation), then the device 2886 * server shall perform a preempt by doing the following in an 2887 * uninterrupted series of actions. (See below..) 2888 */ 2889 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2890 /* 2891 * No existing or SA Reservation Key matching reservations.. 2892 * 2893 * PROUT SA PREEMPT with All Registrant type reservations are 2894 * allowed to be processed without a matching SA Reservation Key 2895 */ 2896 spin_lock(&pr_tmpl->registration_lock); 2897 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2898 &pr_tmpl->registration_list, pr_reg_list) { 2899 /* 2900 * Removing of registrations in non all registrants 2901 * type reservations without a matching SA reservation 2902 * key. 2903 * 2904 * a) Remove the registrations for all I_T nexuses 2905 * specified by the SERVICE ACTION RESERVATION KEY 2906 * field; 2907 * b) Ignore the contents of the SCOPE and TYPE fields; 2908 * c) Process tasks as defined in 5.7.1; and 2909 * d) Establish a unit attention condition for the 2910 * initiator port associated with every I_T nexus 2911 * that lost its registration other than the I_T 2912 * nexus on which the PERSISTENT RESERVE OUT command 2913 * was received, with the additional sense code set 2914 * to REGISTRATIONS PREEMPTED. 2915 */ 2916 if (!all_reg) { 2917 if (pr_reg->pr_res_key != sa_res_key) 2918 continue; 2919 sa_res_key_unmatched = false; 2920 2921 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2922 pr_reg_nacl = pr_reg->pr_reg_nacl; 2923 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2924 __core_scsi3_free_registration(dev, pr_reg, 2925 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2926 NULL, calling_it_nexus); 2927 } else { 2928 /* 2929 * Case for any existing all registrants type 2930 * reservation, follow logic in spc4r17 section 2931 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2932 * 2933 * For a ZERO SA Reservation key, release 2934 * all other registrations and do an implicit 2935 * release of active persistent reservation. 2936 * 2937 * For a non-ZERO SA Reservation key, only 2938 * release the matching reservation key from 2939 * registrations. 2940 */ 2941 if ((sa_res_key) && 2942 (pr_reg->pr_res_key != sa_res_key)) 2943 continue; 2944 sa_res_key_unmatched = false; 2945 2946 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2947 if (calling_it_nexus) 2948 continue; 2949 2950 pr_reg_nacl = pr_reg->pr_reg_nacl; 2951 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2952 __core_scsi3_free_registration(dev, pr_reg, 2953 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2954 NULL, 0); 2955 } 2956 if (!calling_it_nexus) 2957 target_ua_allocate_lun(pr_reg_nacl, 2958 pr_res_mapped_lun, 0x2A, 2959 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2960 } 2961 spin_unlock(&pr_tmpl->registration_lock); 2962 /* 2963 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2964 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2965 * RESERVATION KEY field to a value that does not match any 2966 * registered reservation key, then the device server shall 2967 * complete the command with RESERVATION CONFLICT status. 2968 */ 2969 if (sa_res_key_unmatched) { 2970 spin_unlock(&dev->dev_reservation_lock); 2971 core_scsi3_put_pr_reg(pr_reg_n); 2972 return TCM_RESERVATION_CONFLICT; 2973 } 2974 /* 2975 * For an existing all registrants type reservation 2976 * with a zero SA rservation key, preempt the existing 2977 * reservation with the new PR type and scope. 2978 */ 2979 if (pr_res_holder && all_reg && !(sa_res_key)) { 2980 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2981 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2982 type, scope, preempt_type); 2983 2984 if (preempt_type == PREEMPT_AND_ABORT) 2985 core_scsi3_release_preempt_and_abort( 2986 &preempt_and_abort_list, pr_reg_n); 2987 } 2988 spin_unlock(&dev->dev_reservation_lock); 2989 2990 if (pr_tmpl->pr_aptpl_active) 2991 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2992 2993 core_scsi3_put_pr_reg(pr_reg_n); 2994 core_scsi3_pr_generation(cmd->se_dev); 2995 return 0; 2996 } 2997 /* 2998 * The PREEMPTing SA reservation key matches that of the 2999 * existing persistent reservation, first, we check if 3000 * we are preempting our own reservation. 3001 * From spc4r17, section 5.7.11.4.3 Preempting 3002 * persistent reservations and registration handling 3003 * 3004 * If an all registrants persistent reservation is not 3005 * present, it is not an error for the persistent 3006 * reservation holder to preempt itself (i.e., a 3007 * PERSISTENT RESERVE OUT with a PREEMPT service action 3008 * or a PREEMPT AND ABORT service action with the 3009 * SERVICE ACTION RESERVATION KEY value equal to the 3010 * persistent reservation holder's reservation key that 3011 * is received from the persistent reservation holder). 3012 * In that case, the device server shall establish the 3013 * new persistent reservation and maintain the 3014 * registration. 3015 */ 3016 prh_type = pr_res_holder->pr_res_type; 3017 prh_scope = pr_res_holder->pr_res_scope; 3018 /* 3019 * If the SERVICE ACTION RESERVATION KEY field identifies a 3020 * persistent reservation holder (see 5.7.10), the device 3021 * server shall perform a preempt by doing the following as 3022 * an uninterrupted series of actions: 3023 * 3024 * a) Release the persistent reservation for the holder 3025 * identified by the SERVICE ACTION RESERVATION KEY field; 3026 */ 3027 if (pr_reg_n != pr_res_holder) 3028 __core_scsi3_complete_pro_release(dev, 3029 pr_res_holder->pr_reg_nacl, 3030 dev->dev_pr_res_holder, 0, 0); 3031 /* 3032 * b) Remove the registrations for all I_T nexuses identified 3033 * by the SERVICE ACTION RESERVATION KEY field, except the 3034 * I_T nexus that is being used for the PERSISTENT RESERVE 3035 * OUT command. If an all registrants persistent reservation 3036 * is present and the SERVICE ACTION RESERVATION KEY field 3037 * is set to zero, then all registrations shall be removed 3038 * except for that of the I_T nexus that is being used for 3039 * the PERSISTENT RESERVE OUT command; 3040 */ 3041 spin_lock(&pr_tmpl->registration_lock); 3042 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3043 &pr_tmpl->registration_list, pr_reg_list) { 3044 3045 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3046 if (calling_it_nexus) 3047 continue; 3048 3049 if (pr_reg->pr_res_key != sa_res_key) 3050 continue; 3051 3052 pr_reg_nacl = pr_reg->pr_reg_nacl; 3053 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3054 __core_scsi3_free_registration(dev, pr_reg, 3055 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3056 calling_it_nexus); 3057 /* 3058 * e) Establish a unit attention condition for the initiator 3059 * port associated with every I_T nexus that lost its 3060 * persistent reservation and/or registration, with the 3061 * additional sense code set to REGISTRATIONS PREEMPTED; 3062 */ 3063 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3064 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3065 } 3066 spin_unlock(&pr_tmpl->registration_lock); 3067 /* 3068 * c) Establish a persistent reservation for the preempting 3069 * I_T nexus using the contents of the SCOPE and TYPE fields; 3070 */ 3071 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3072 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3073 type, scope, preempt_type); 3074 /* 3075 * d) Process tasks as defined in 5.7.1; 3076 * e) See above.. 3077 * f) If the type or scope has changed, then for every I_T nexus 3078 * whose reservation key was not removed, except for the I_T 3079 * nexus on which the PERSISTENT RESERVE OUT command was 3080 * received, the device server shall establish a unit 3081 * attention condition for the initiator port associated with 3082 * that I_T nexus, with the additional sense code set to 3083 * RESERVATIONS RELEASED. If the type or scope have not 3084 * changed, then no unit attention condition(s) shall be 3085 * established for this reason. 3086 */ 3087 if ((prh_type != type) || (prh_scope != scope)) { 3088 spin_lock(&pr_tmpl->registration_lock); 3089 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3090 &pr_tmpl->registration_list, pr_reg_list) { 3091 3092 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3093 if (calling_it_nexus) 3094 continue; 3095 3096 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3097 pr_reg->pr_res_mapped_lun, 0x2A, 3098 ASCQ_2AH_RESERVATIONS_RELEASED); 3099 } 3100 spin_unlock(&pr_tmpl->registration_lock); 3101 } 3102 spin_unlock(&dev->dev_reservation_lock); 3103 /* 3104 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3105 * All received CDBs for the matching existing reservation and 3106 * registrations undergo ABORT_TASK logic. 3107 * 3108 * From there, core_scsi3_release_preempt_and_abort() will 3109 * release every registration in the list (which have already 3110 * been removed from the primary pr_reg list), except the 3111 * new persistent reservation holder, the calling Initiator Port. 3112 */ 3113 if (preempt_type == PREEMPT_AND_ABORT) { 3114 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3115 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3116 pr_reg_n); 3117 } 3118 3119 if (pr_tmpl->pr_aptpl_active) 3120 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3121 3122 core_scsi3_put_pr_reg(pr_reg_n); 3123 core_scsi3_pr_generation(cmd->se_dev); 3124 return 0; 3125 } 3126 3127 static sense_reason_t 3128 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3129 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3130 { 3131 switch (type) { 3132 case PR_TYPE_WRITE_EXCLUSIVE: 3133 case PR_TYPE_EXCLUSIVE_ACCESS: 3134 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3135 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3136 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3137 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3138 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3139 sa_res_key, preempt_type); 3140 default: 3141 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3142 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3143 return TCM_INVALID_CDB_FIELD; 3144 } 3145 } 3146 3147 3148 static sense_reason_t 3149 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3150 u64 sa_res_key, int aptpl, int unreg) 3151 { 3152 struct se_session *se_sess = cmd->se_sess; 3153 struct se_device *dev = cmd->se_dev; 3154 struct se_dev_entry *dest_se_deve = NULL; 3155 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3156 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3157 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3158 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3159 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3160 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3161 unsigned char *buf; 3162 const unsigned char *initiator_str; 3163 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3164 u32 tid_len, tmp_tid_len; 3165 int new_reg = 0, type, scope, matching_iname; 3166 sense_reason_t ret; 3167 unsigned short rtpi; 3168 unsigned char proto_ident; 3169 3170 if (!se_sess || !se_lun) { 3171 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3173 } 3174 3175 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3176 se_tpg = se_sess->se_tpg; 3177 tf_ops = se_tpg->se_tpg_tfo; 3178 /* 3179 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3180 * Register behaviors for a REGISTER AND MOVE service action 3181 * 3182 * Locate the existing *pr_reg via struct se_node_acl pointers 3183 */ 3184 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3185 se_sess); 3186 if (!pr_reg) { 3187 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3188 " *pr_reg for REGISTER_AND_MOVE\n"); 3189 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3190 } 3191 /* 3192 * The provided reservation key much match the existing reservation key 3193 * provided during this initiator's I_T nexus registration. 3194 */ 3195 if (res_key != pr_reg->pr_res_key) { 3196 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3197 " res_key: 0x%016Lx does not match existing SA REGISTER" 3198 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3199 ret = TCM_RESERVATION_CONFLICT; 3200 goto out_put_pr_reg; 3201 } 3202 /* 3203 * The service active reservation key needs to be non zero 3204 */ 3205 if (!sa_res_key) { 3206 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3207 " sa_res_key\n"); 3208 ret = TCM_INVALID_PARAMETER_LIST; 3209 goto out_put_pr_reg; 3210 } 3211 3212 /* 3213 * Determine the Relative Target Port Identifier where the reservation 3214 * will be moved to for the TransportID containing SCSI initiator WWN 3215 * information. 3216 */ 3217 buf = transport_kmap_data_sg(cmd); 3218 if (!buf) { 3219 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3220 goto out_put_pr_reg; 3221 } 3222 3223 rtpi = (buf[18] & 0xff) << 8; 3224 rtpi |= buf[19] & 0xff; 3225 tid_len = (buf[20] & 0xff) << 24; 3226 tid_len |= (buf[21] & 0xff) << 16; 3227 tid_len |= (buf[22] & 0xff) << 8; 3228 tid_len |= buf[23] & 0xff; 3229 transport_kunmap_data_sg(cmd); 3230 buf = NULL; 3231 3232 if ((tid_len + 24) != cmd->data_length) { 3233 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3234 " does not equal CDB data_length: %u\n", tid_len, 3235 cmd->data_length); 3236 ret = TCM_INVALID_PARAMETER_LIST; 3237 goto out_put_pr_reg; 3238 } 3239 3240 spin_lock(&dev->se_port_lock); 3241 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3242 if (tmp_lun->lun_rtpi != rtpi) 3243 continue; 3244 dest_se_tpg = tmp_lun->lun_tpg; 3245 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3246 if (!dest_tf_ops) 3247 continue; 3248 3249 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3250 spin_unlock(&dev->se_port_lock); 3251 3252 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3253 pr_err("core_scsi3_tpg_depend_item() failed" 3254 " for dest_se_tpg\n"); 3255 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3256 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3257 goto out_put_pr_reg; 3258 } 3259 3260 spin_lock(&dev->se_port_lock); 3261 break; 3262 } 3263 spin_unlock(&dev->se_port_lock); 3264 3265 if (!dest_se_tpg || !dest_tf_ops) { 3266 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3267 " fabric ops from Relative Target Port Identifier:" 3268 " %hu\n", rtpi); 3269 ret = TCM_INVALID_PARAMETER_LIST; 3270 goto out_put_pr_reg; 3271 } 3272 3273 buf = transport_kmap_data_sg(cmd); 3274 if (!buf) { 3275 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3276 goto out_put_pr_reg; 3277 } 3278 proto_ident = (buf[24] & 0x0f); 3279 3280 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3281 " 0x%02x\n", proto_ident); 3282 3283 if (proto_ident != dest_se_tpg->proto_id) { 3284 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3285 " proto_ident: 0x%02x does not match ident: 0x%02x" 3286 " from fabric: %s\n", proto_ident, 3287 dest_se_tpg->proto_id, 3288 dest_tf_ops->get_fabric_name()); 3289 ret = TCM_INVALID_PARAMETER_LIST; 3290 goto out; 3291 } 3292 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3293 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3294 if (!initiator_str) { 3295 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3296 " initiator_str from Transport ID\n"); 3297 ret = TCM_INVALID_PARAMETER_LIST; 3298 goto out; 3299 } 3300 3301 transport_kunmap_data_sg(cmd); 3302 buf = NULL; 3303 3304 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3305 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3306 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3307 iport_ptr : ""); 3308 /* 3309 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3310 * action specifies a TransportID that is the same as the initiator port 3311 * of the I_T nexus for the command received, then the command shall 3312 * be terminated with CHECK CONDITION status, with the sense key set to 3313 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3314 * IN PARAMETER LIST. 3315 */ 3316 pr_reg_nacl = pr_reg->pr_reg_nacl; 3317 matching_iname = (!strcmp(initiator_str, 3318 pr_reg_nacl->initiatorname)) ? 1 : 0; 3319 if (!matching_iname) 3320 goto after_iport_check; 3321 3322 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3323 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3324 " matches: %s on received I_T Nexus\n", initiator_str, 3325 pr_reg_nacl->initiatorname); 3326 ret = TCM_INVALID_PARAMETER_LIST; 3327 goto out; 3328 } 3329 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3330 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3331 " matches: %s %s on received I_T Nexus\n", 3332 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3333 pr_reg->pr_reg_isid); 3334 ret = TCM_INVALID_PARAMETER_LIST; 3335 goto out; 3336 } 3337 after_iport_check: 3338 /* 3339 * Locate the destination struct se_node_acl from the received Transport ID 3340 */ 3341 mutex_lock(&dest_se_tpg->acl_node_mutex); 3342 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3343 initiator_str); 3344 if (dest_node_acl) 3345 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3346 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3347 3348 if (!dest_node_acl) { 3349 pr_err("Unable to locate %s dest_node_acl for" 3350 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3351 initiator_str); 3352 ret = TCM_INVALID_PARAMETER_LIST; 3353 goto out; 3354 } 3355 3356 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3357 pr_err("core_scsi3_nodeacl_depend_item() for" 3358 " dest_node_acl\n"); 3359 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3360 dest_node_acl = NULL; 3361 ret = TCM_INVALID_PARAMETER_LIST; 3362 goto out; 3363 } 3364 3365 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3366 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3367 dest_node_acl->initiatorname); 3368 3369 /* 3370 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3371 * PORT IDENTIFIER. 3372 */ 3373 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3374 if (!dest_se_deve) { 3375 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3376 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3377 ret = TCM_INVALID_PARAMETER_LIST; 3378 goto out; 3379 } 3380 3381 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3382 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3383 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3384 dest_se_deve = NULL; 3385 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3386 goto out; 3387 } 3388 3389 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3390 " ACL for dest_se_deve->mapped_lun: %llu\n", 3391 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3392 dest_se_deve->mapped_lun); 3393 3394 /* 3395 * A persistent reservation needs to already existing in order to 3396 * successfully complete the REGISTER_AND_MOVE service action.. 3397 */ 3398 spin_lock(&dev->dev_reservation_lock); 3399 pr_res_holder = dev->dev_pr_res_holder; 3400 if (!pr_res_holder) { 3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3402 " currently held\n"); 3403 spin_unlock(&dev->dev_reservation_lock); 3404 ret = TCM_INVALID_CDB_FIELD; 3405 goto out; 3406 } 3407 /* 3408 * The received on I_T Nexus must be the reservation holder. 3409 * 3410 * From spc4r17 section 5.7.8 Table 50 -- 3411 * Register behaviors for a REGISTER AND MOVE service action 3412 */ 3413 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3414 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3415 " Nexus is not reservation holder\n"); 3416 spin_unlock(&dev->dev_reservation_lock); 3417 ret = TCM_RESERVATION_CONFLICT; 3418 goto out; 3419 } 3420 /* 3421 * From spc4r17 section 5.7.8: registering and moving reservation 3422 * 3423 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3424 * action is received and the established persistent reservation is a 3425 * Write Exclusive - All Registrants type or Exclusive Access - 3426 * All Registrants type reservation, then the command shall be completed 3427 * with RESERVATION CONFLICT status. 3428 */ 3429 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3430 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3431 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3432 " reservation for type: %s\n", 3433 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3434 spin_unlock(&dev->dev_reservation_lock); 3435 ret = TCM_RESERVATION_CONFLICT; 3436 goto out; 3437 } 3438 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3439 /* 3440 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3441 */ 3442 type = pr_res_holder->pr_res_type; 3443 scope = pr_res_holder->pr_res_type; 3444 /* 3445 * c) Associate the reservation key specified in the SERVICE ACTION 3446 * RESERVATION KEY field with the I_T nexus specified as the 3447 * destination of the register and move, where: 3448 * A) The I_T nexus is specified by the TransportID and the 3449 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3450 * B) Regardless of the TransportID format used, the association for 3451 * the initiator port is based on either the initiator port name 3452 * (see 3.1.71) on SCSI transport protocols where port names are 3453 * required or the initiator port identifier (see 3.1.70) on SCSI 3454 * transport protocols where port names are not required; 3455 * d) Register the reservation key specified in the SERVICE ACTION 3456 * RESERVATION KEY field; 3457 * e) Retain the reservation key specified in the SERVICE ACTION 3458 * RESERVATION KEY field and associated information; 3459 * 3460 * Also, It is not an error for a REGISTER AND MOVE service action to 3461 * register an I_T nexus that is already registered with the same 3462 * reservation key or a different reservation key. 3463 */ 3464 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3465 iport_ptr); 3466 if (!dest_pr_reg) { 3467 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3468 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 3469 3470 spin_unlock(&dev->dev_reservation_lock); 3471 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3472 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3473 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3474 ret = TCM_INVALID_PARAMETER_LIST; 3475 goto out; 3476 } 3477 spin_lock(&dev->dev_reservation_lock); 3478 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3479 iport_ptr); 3480 new_reg = 1; 3481 } 3482 /* 3483 * f) Release the persistent reservation for the persistent reservation 3484 * holder (i.e., the I_T nexus on which the 3485 */ 3486 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3487 dev->dev_pr_res_holder, 0, 0); 3488 /* 3489 * g) Move the persistent reservation to the specified I_T nexus using 3490 * the same scope and type as the persistent reservation released in 3491 * item f); and 3492 */ 3493 dev->dev_pr_res_holder = dest_pr_reg; 3494 dest_pr_reg->pr_res_holder = 1; 3495 dest_pr_reg->pr_res_type = type; 3496 pr_reg->pr_res_scope = scope; 3497 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3498 /* 3499 * Increment PRGeneration for existing registrations.. 3500 */ 3501 if (!new_reg) 3502 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3503 spin_unlock(&dev->dev_reservation_lock); 3504 3505 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3506 " created new reservation holder TYPE: %s on object RTPI:" 3507 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3508 core_scsi3_pr_dump_type(type), rtpi, 3509 dest_pr_reg->pr_res_generation); 3510 pr_debug("SPC-3 PR Successfully moved reservation from" 3511 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3512 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3513 i_buf, dest_tf_ops->get_fabric_name(), 3514 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3515 iport_ptr : ""); 3516 /* 3517 * It is now safe to release configfs group dependencies for destination 3518 * of Transport ID Initiator Device/Port Identifier 3519 */ 3520 core_scsi3_lunacl_undepend_item(dest_se_deve); 3521 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3522 core_scsi3_tpg_undepend_item(dest_se_tpg); 3523 /* 3524 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3525 * nexus on which PERSISTENT RESERVE OUT command was received. 3526 */ 3527 if (unreg) { 3528 spin_lock(&pr_tmpl->registration_lock); 3529 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3530 spin_unlock(&pr_tmpl->registration_lock); 3531 } else 3532 core_scsi3_put_pr_reg(pr_reg); 3533 3534 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3535 3536 transport_kunmap_data_sg(cmd); 3537 3538 core_scsi3_put_pr_reg(dest_pr_reg); 3539 return 0; 3540 out: 3541 if (buf) 3542 transport_kunmap_data_sg(cmd); 3543 if (dest_se_deve) 3544 core_scsi3_lunacl_undepend_item(dest_se_deve); 3545 if (dest_node_acl) 3546 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3547 core_scsi3_tpg_undepend_item(dest_se_tpg); 3548 3549 out_put_pr_reg: 3550 core_scsi3_put_pr_reg(pr_reg); 3551 return ret; 3552 } 3553 3554 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3555 { 3556 unsigned int __v1, __v2; 3557 3558 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3559 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3560 3561 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3562 } 3563 3564 /* 3565 * See spc4r17 section 6.14 Table 170 3566 */ 3567 sense_reason_t 3568 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3569 { 3570 struct se_device *dev = cmd->se_dev; 3571 unsigned char *cdb = &cmd->t_task_cdb[0]; 3572 unsigned char *buf; 3573 u64 res_key, sa_res_key; 3574 int sa, scope, type, aptpl; 3575 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3576 sense_reason_t ret; 3577 3578 /* 3579 * Following spc2r20 5.5.1 Reservations overview: 3580 * 3581 * If a logical unit has been reserved by any RESERVE command and is 3582 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3583 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3584 * initiator or service action and shall terminate with a RESERVATION 3585 * CONFLICT status. 3586 */ 3587 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3588 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3589 " SPC-2 reservation is held, returning" 3590 " RESERVATION_CONFLICT\n"); 3591 return TCM_RESERVATION_CONFLICT; 3592 } 3593 3594 /* 3595 * FIXME: A NULL struct se_session pointer means an this is not coming from 3596 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3597 */ 3598 if (!cmd->se_sess) 3599 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3600 3601 if (cmd->data_length < 24) { 3602 pr_warn("SPC-PR: Received PR OUT parameter list" 3603 " length too small: %u\n", cmd->data_length); 3604 return TCM_INVALID_PARAMETER_LIST; 3605 } 3606 3607 /* 3608 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3609 */ 3610 sa = (cdb[1] & 0x1f); 3611 scope = (cdb[2] & 0xf0); 3612 type = (cdb[2] & 0x0f); 3613 3614 buf = transport_kmap_data_sg(cmd); 3615 if (!buf) 3616 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3617 3618 /* 3619 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3620 */ 3621 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3622 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3623 /* 3624 * REGISTER_AND_MOVE uses a different SA parameter list containing 3625 * SCSI TransportIDs. 3626 */ 3627 if (sa != PRO_REGISTER_AND_MOVE) { 3628 spec_i_pt = (buf[20] & 0x08); 3629 all_tg_pt = (buf[20] & 0x04); 3630 aptpl = (buf[20] & 0x01); 3631 } else { 3632 aptpl = (buf[17] & 0x01); 3633 unreg = (buf[17] & 0x02); 3634 } 3635 /* 3636 * If the backend device has been configured to force APTPL metadata 3637 * write-out, go ahead and propigate aptpl=1 down now. 3638 */ 3639 if (dev->dev_attrib.force_pr_aptpl) 3640 aptpl = 1; 3641 3642 transport_kunmap_data_sg(cmd); 3643 buf = NULL; 3644 3645 /* 3646 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3647 */ 3648 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3649 return TCM_INVALID_PARAMETER_LIST; 3650 3651 /* 3652 * From spc4r17 section 6.14: 3653 * 3654 * If the SPEC_I_PT bit is set to zero, the service action is not 3655 * REGISTER AND MOVE, and the parameter list length is not 24, then 3656 * the command shall be terminated with CHECK CONDITION status, with 3657 * the sense key set to ILLEGAL REQUEST, and the additional sense 3658 * code set to PARAMETER LIST LENGTH ERROR. 3659 */ 3660 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3661 (cmd->data_length != 24)) { 3662 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3663 " list length: %u\n", cmd->data_length); 3664 return TCM_INVALID_PARAMETER_LIST; 3665 } 3666 3667 /* 3668 * (core_scsi3_emulate_pro_* function parameters 3669 * are defined by spc4r17 Table 174: 3670 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3671 */ 3672 switch (sa) { 3673 case PRO_REGISTER: 3674 ret = core_scsi3_emulate_pro_register(cmd, 3675 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3676 break; 3677 case PRO_RESERVE: 3678 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3679 break; 3680 case PRO_RELEASE: 3681 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3682 break; 3683 case PRO_CLEAR: 3684 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3685 break; 3686 case PRO_PREEMPT: 3687 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3688 res_key, sa_res_key, PREEMPT); 3689 break; 3690 case PRO_PREEMPT_AND_ABORT: 3691 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3692 res_key, sa_res_key, PREEMPT_AND_ABORT); 3693 break; 3694 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3695 ret = core_scsi3_emulate_pro_register(cmd, 3696 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3697 break; 3698 case PRO_REGISTER_AND_MOVE: 3699 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3700 sa_res_key, aptpl, unreg); 3701 break; 3702 default: 3703 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3704 " action: 0x%02x\n", cdb[1] & 0x1f); 3705 return TCM_INVALID_CDB_FIELD; 3706 } 3707 3708 if (!ret) 3709 target_complete_cmd(cmd, GOOD); 3710 return ret; 3711 } 3712 3713 /* 3714 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3715 * 3716 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3717 */ 3718 static sense_reason_t 3719 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3720 { 3721 struct se_device *dev = cmd->se_dev; 3722 struct t10_pr_registration *pr_reg; 3723 unsigned char *buf; 3724 u32 add_len = 0, off = 8; 3725 3726 if (cmd->data_length < 8) { 3727 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3728 " too small\n", cmd->data_length); 3729 return TCM_INVALID_CDB_FIELD; 3730 } 3731 3732 buf = transport_kmap_data_sg(cmd); 3733 if (!buf) 3734 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3735 3736 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3737 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3738 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3739 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3740 3741 spin_lock(&dev->t10_pr.registration_lock); 3742 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3743 pr_reg_list) { 3744 /* 3745 * Check for overflow of 8byte PRI READ_KEYS payload and 3746 * next reservation key list descriptor. 3747 */ 3748 if ((add_len + 8) > (cmd->data_length - 8)) 3749 break; 3750 3751 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3752 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3753 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3754 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3755 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3756 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3757 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3758 buf[off++] = (pr_reg->pr_res_key & 0xff); 3759 3760 add_len += 8; 3761 } 3762 spin_unlock(&dev->t10_pr.registration_lock); 3763 3764 buf[4] = ((add_len >> 24) & 0xff); 3765 buf[5] = ((add_len >> 16) & 0xff); 3766 buf[6] = ((add_len >> 8) & 0xff); 3767 buf[7] = (add_len & 0xff); 3768 3769 transport_kunmap_data_sg(cmd); 3770 3771 return 0; 3772 } 3773 3774 /* 3775 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3776 * 3777 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3778 */ 3779 static sense_reason_t 3780 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3781 { 3782 struct se_device *dev = cmd->se_dev; 3783 struct t10_pr_registration *pr_reg; 3784 unsigned char *buf; 3785 u64 pr_res_key; 3786 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3787 3788 if (cmd->data_length < 8) { 3789 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3790 " too small\n", cmd->data_length); 3791 return TCM_INVALID_CDB_FIELD; 3792 } 3793 3794 buf = transport_kmap_data_sg(cmd); 3795 if (!buf) 3796 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3797 3798 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3799 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3800 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3801 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3802 3803 spin_lock(&dev->dev_reservation_lock); 3804 pr_reg = dev->dev_pr_res_holder; 3805 if (pr_reg) { 3806 /* 3807 * Set the hardcoded Additional Length 3808 */ 3809 buf[4] = ((add_len >> 24) & 0xff); 3810 buf[5] = ((add_len >> 16) & 0xff); 3811 buf[6] = ((add_len >> 8) & 0xff); 3812 buf[7] = (add_len & 0xff); 3813 3814 if (cmd->data_length < 22) 3815 goto err; 3816 3817 /* 3818 * Set the Reservation key. 3819 * 3820 * From spc4r17, section 5.7.10: 3821 * A persistent reservation holder has its reservation key 3822 * returned in the parameter data from a PERSISTENT 3823 * RESERVE IN command with READ RESERVATION service action as 3824 * follows: 3825 * a) For a persistent reservation of the type Write Exclusive 3826 * - All Registrants or Exclusive Access All Regitrants, 3827 * the reservation key shall be set to zero; or 3828 * b) For all other persistent reservation types, the 3829 * reservation key shall be set to the registered 3830 * reservation key for the I_T nexus that holds the 3831 * persistent reservation. 3832 */ 3833 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3834 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3835 pr_res_key = 0; 3836 else 3837 pr_res_key = pr_reg->pr_res_key; 3838 3839 buf[8] = ((pr_res_key >> 56) & 0xff); 3840 buf[9] = ((pr_res_key >> 48) & 0xff); 3841 buf[10] = ((pr_res_key >> 40) & 0xff); 3842 buf[11] = ((pr_res_key >> 32) & 0xff); 3843 buf[12] = ((pr_res_key >> 24) & 0xff); 3844 buf[13] = ((pr_res_key >> 16) & 0xff); 3845 buf[14] = ((pr_res_key >> 8) & 0xff); 3846 buf[15] = (pr_res_key & 0xff); 3847 /* 3848 * Set the SCOPE and TYPE 3849 */ 3850 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3851 (pr_reg->pr_res_type & 0x0f); 3852 } 3853 3854 err: 3855 spin_unlock(&dev->dev_reservation_lock); 3856 transport_kunmap_data_sg(cmd); 3857 3858 return 0; 3859 } 3860 3861 /* 3862 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3863 * 3864 * See spc4r17 section 6.13.4 Table 165 3865 */ 3866 static sense_reason_t 3867 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3868 { 3869 struct se_device *dev = cmd->se_dev; 3870 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3871 unsigned char *buf; 3872 u16 add_len = 8; /* Hardcoded to 8. */ 3873 3874 if (cmd->data_length < 6) { 3875 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3876 " %u too small\n", cmd->data_length); 3877 return TCM_INVALID_CDB_FIELD; 3878 } 3879 3880 buf = transport_kmap_data_sg(cmd); 3881 if (!buf) 3882 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3883 3884 buf[0] = ((add_len >> 8) & 0xff); 3885 buf[1] = (add_len & 0xff); 3886 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3887 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3888 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3889 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3890 /* 3891 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3892 * set the TMV: Task Mask Valid bit. 3893 */ 3894 buf[3] |= 0x80; 3895 /* 3896 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3897 */ 3898 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3899 /* 3900 * PTPL_A: Persistence across Target Power Loss Active bit 3901 */ 3902 if (pr_tmpl->pr_aptpl_active) 3903 buf[3] |= 0x01; 3904 /* 3905 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3906 */ 3907 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3908 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3909 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3910 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3911 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3912 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3913 3914 transport_kunmap_data_sg(cmd); 3915 3916 return 0; 3917 } 3918 3919 /* 3920 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3921 * 3922 * See spc4r17 section 6.13.5 Table 168 and 169 3923 */ 3924 static sense_reason_t 3925 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3926 { 3927 struct se_device *dev = cmd->se_dev; 3928 struct se_node_acl *se_nacl; 3929 struct se_portal_group *se_tpg; 3930 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3931 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3932 unsigned char *buf; 3933 u32 add_desc_len = 0, add_len = 0; 3934 u32 off = 8; /* off into first Full Status descriptor */ 3935 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3936 int exp_desc_len, desc_len; 3937 bool all_reg = false; 3938 3939 if (cmd->data_length < 8) { 3940 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3941 " too small\n", cmd->data_length); 3942 return TCM_INVALID_CDB_FIELD; 3943 } 3944 3945 buf = transport_kmap_data_sg(cmd); 3946 if (!buf) 3947 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3948 3949 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3950 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3951 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3952 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3953 3954 spin_lock(&dev->dev_reservation_lock); 3955 if (dev->dev_pr_res_holder) { 3956 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3957 3958 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3959 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3960 all_reg = true; 3961 pr_res_type = pr_holder->pr_res_type; 3962 pr_res_scope = pr_holder->pr_res_scope; 3963 } 3964 } 3965 spin_unlock(&dev->dev_reservation_lock); 3966 3967 spin_lock(&pr_tmpl->registration_lock); 3968 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3969 &pr_tmpl->registration_list, pr_reg_list) { 3970 3971 se_nacl = pr_reg->pr_reg_nacl; 3972 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3973 add_desc_len = 0; 3974 3975 atomic_inc_mb(&pr_reg->pr_res_holders); 3976 spin_unlock(&pr_tmpl->registration_lock); 3977 /* 3978 * Determine expected length of $FABRIC_MOD specific 3979 * TransportID full status descriptor.. 3980 */ 3981 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3982 &format_code); 3983 if (exp_desc_len < 0 || 3984 exp_desc_len + add_len > cmd->data_length) { 3985 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3986 " out of buffer: %d\n", cmd->data_length); 3987 spin_lock(&pr_tmpl->registration_lock); 3988 atomic_dec_mb(&pr_reg->pr_res_holders); 3989 break; 3990 } 3991 /* 3992 * Set RESERVATION KEY 3993 */ 3994 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3995 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3996 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3997 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3998 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3999 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4000 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4001 buf[off++] = (pr_reg->pr_res_key & 0xff); 4002 off += 4; /* Skip Over Reserved area */ 4003 4004 /* 4005 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4006 */ 4007 if (pr_reg->pr_reg_all_tg_pt) 4008 buf[off] = 0x02; 4009 /* 4010 * The struct se_lun pointer will be present for the 4011 * reservation holder for PR_HOLDER bit. 4012 * 4013 * Also, if this registration is the reservation 4014 * holder or there is an All Registrants reservation 4015 * active, fill in SCOPE and TYPE in the next byte. 4016 */ 4017 if (pr_reg->pr_res_holder) { 4018 buf[off++] |= 0x01; 4019 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4020 (pr_reg->pr_res_type & 0x0f); 4021 } else if (all_reg) { 4022 buf[off++] |= 0x01; 4023 buf[off++] = (pr_res_scope & 0xf0) | 4024 (pr_res_type & 0x0f); 4025 } else { 4026 off += 2; 4027 } 4028 4029 off += 4; /* Skip over reserved area */ 4030 /* 4031 * From spc4r17 6.3.15: 4032 * 4033 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4034 * IDENTIFIER field contains the relative port identifier (see 4035 * 3.1.120) of the target port that is part of the I_T nexus 4036 * described by this full status descriptor. If the ALL_TG_PT 4037 * bit is set to one, the contents of the RELATIVE TARGET PORT 4038 * IDENTIFIER field are not defined by this standard. 4039 */ 4040 if (!pr_reg->pr_reg_all_tg_pt) { 4041 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4042 4043 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4044 buf[off++] = (sep_rtpi & 0xff); 4045 } else 4046 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4047 4048 buf[off+4] = se_tpg->proto_id; 4049 4050 /* 4051 * Now, have the $FABRIC_MOD fill in the transport ID. 4052 */ 4053 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4054 &format_code, &buf[off+4]); 4055 4056 spin_lock(&pr_tmpl->registration_lock); 4057 atomic_dec_mb(&pr_reg->pr_res_holders); 4058 4059 if (desc_len < 0) 4060 break; 4061 /* 4062 * Set the ADDITIONAL DESCRIPTOR LENGTH 4063 */ 4064 buf[off++] = ((desc_len >> 24) & 0xff); 4065 buf[off++] = ((desc_len >> 16) & 0xff); 4066 buf[off++] = ((desc_len >> 8) & 0xff); 4067 buf[off++] = (desc_len & 0xff); 4068 /* 4069 * Size of full desctipor header minus TransportID 4070 * containing $FABRIC_MOD specific) initiator device/port 4071 * WWN information. 4072 * 4073 * See spc4r17 Section 6.13.5 Table 169 4074 */ 4075 add_desc_len = (24 + desc_len); 4076 4077 off += desc_len; 4078 add_len += add_desc_len; 4079 } 4080 spin_unlock(&pr_tmpl->registration_lock); 4081 /* 4082 * Set ADDITIONAL_LENGTH 4083 */ 4084 buf[4] = ((add_len >> 24) & 0xff); 4085 buf[5] = ((add_len >> 16) & 0xff); 4086 buf[6] = ((add_len >> 8) & 0xff); 4087 buf[7] = (add_len & 0xff); 4088 4089 transport_kunmap_data_sg(cmd); 4090 4091 return 0; 4092 } 4093 4094 sense_reason_t 4095 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4096 { 4097 sense_reason_t ret; 4098 4099 /* 4100 * Following spc2r20 5.5.1 Reservations overview: 4101 * 4102 * If a logical unit has been reserved by any RESERVE command and is 4103 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4104 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4105 * initiator or service action and shall terminate with a RESERVATION 4106 * CONFLICT status. 4107 */ 4108 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4109 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4110 " SPC-2 reservation is held, returning" 4111 " RESERVATION_CONFLICT\n"); 4112 return TCM_RESERVATION_CONFLICT; 4113 } 4114 4115 switch (cmd->t_task_cdb[1] & 0x1f) { 4116 case PRI_READ_KEYS: 4117 ret = core_scsi3_pri_read_keys(cmd); 4118 break; 4119 case PRI_READ_RESERVATION: 4120 ret = core_scsi3_pri_read_reservation(cmd); 4121 break; 4122 case PRI_REPORT_CAPABILITIES: 4123 ret = core_scsi3_pri_report_capabilities(cmd); 4124 break; 4125 case PRI_READ_FULL_STATUS: 4126 ret = core_scsi3_pri_read_full_status(cmd); 4127 break; 4128 default: 4129 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4130 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4131 return TCM_INVALID_CDB_FIELD; 4132 } 4133 4134 if (!ret) 4135 target_complete_cmd(cmd, GOOD); 4136 return ret; 4137 } 4138 4139 sense_reason_t 4140 target_check_reservation(struct se_cmd *cmd) 4141 { 4142 struct se_device *dev = cmd->se_dev; 4143 sense_reason_t ret; 4144 4145 if (!cmd->se_sess) 4146 return 0; 4147 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4148 return 0; 4149 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4150 return 0; 4151 4152 spin_lock(&dev->dev_reservation_lock); 4153 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4154 ret = target_scsi2_reservation_check(cmd); 4155 else 4156 ret = target_scsi3_pr_reservation_check(cmd); 4157 spin_unlock(&dev->dev_reservation_lock); 4158 4159 return ret; 4160 } 4161