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 struct se_node_acl *nacl; 1461 struct se_portal_group *tpg; 1462 /* 1463 * For nacl->dynamic_node_acl=1 1464 */ 1465 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1466 atomic_read(&se_deve->pr_kref.refcount) != 0); 1467 if (!lun_acl) 1468 return 0; 1469 1470 nacl = lun_acl->se_lun_nacl; 1471 tpg = nacl->se_tpg; 1472 1473 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1474 } 1475 1476 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1477 { 1478 struct se_lun_acl *lun_acl; 1479 struct se_node_acl *nacl; 1480 struct se_portal_group *tpg; 1481 /* 1482 * For nacl->dynamic_node_acl=1 1483 */ 1484 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1485 atomic_read(&se_deve->pr_kref.refcount) != 0); 1486 if (!lun_acl) { 1487 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1488 return; 1489 } 1490 nacl = lun_acl->se_lun_nacl; 1491 tpg = nacl->se_tpg; 1492 1493 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1494 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1495 } 1496 1497 static sense_reason_t 1498 core_scsi3_decode_spec_i_port( 1499 struct se_cmd *cmd, 1500 struct se_portal_group *tpg, 1501 unsigned char *l_isid, 1502 u64 sa_res_key, 1503 int all_tg_pt, 1504 int aptpl) 1505 { 1506 struct se_device *dev = cmd->se_dev; 1507 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1508 struct se_session *se_sess = cmd->se_sess; 1509 struct se_node_acl *dest_node_acl = NULL; 1510 struct se_dev_entry *dest_se_deve = NULL; 1511 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1512 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1513 LIST_HEAD(tid_dest_list); 1514 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1515 unsigned char *buf, *ptr, proto_ident; 1516 const unsigned char *i_str = NULL; 1517 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1518 sense_reason_t ret; 1519 u32 tpdl, tid_len = 0; 1520 u32 dest_rtpi = 0; 1521 1522 /* 1523 * Allocate a struct pr_transport_id_holder and setup the 1524 * local_node_acl pointer and add to struct list_head tid_dest_list 1525 * for add registration processing in the loop of tid_dest_list below. 1526 */ 1527 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1528 if (!tidh_new) { 1529 pr_err("Unable to allocate tidh_new\n"); 1530 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1531 } 1532 INIT_LIST_HEAD(&tidh_new->dest_list); 1533 tidh_new->dest_tpg = tpg; 1534 tidh_new->dest_node_acl = se_sess->se_node_acl; 1535 1536 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1537 se_sess->se_node_acl, cmd->se_lun, 1538 NULL, cmd->orig_fe_lun, l_isid, 1539 sa_res_key, all_tg_pt, aptpl); 1540 if (!local_pr_reg) { 1541 kfree(tidh_new); 1542 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1543 } 1544 tidh_new->dest_pr_reg = local_pr_reg; 1545 /* 1546 * The local I_T nexus does not hold any configfs dependances, 1547 * so we set tidh_new->dest_se_deve to NULL to prevent the 1548 * configfs_undepend_item() calls in the tid_dest_list loops below. 1549 */ 1550 tidh_new->dest_se_deve = NULL; 1551 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1552 1553 if (cmd->data_length < 28) { 1554 pr_warn("SPC-PR: Received PR OUT parameter list" 1555 " length too small: %u\n", cmd->data_length); 1556 ret = TCM_INVALID_PARAMETER_LIST; 1557 goto out; 1558 } 1559 1560 buf = transport_kmap_data_sg(cmd); 1561 if (!buf) { 1562 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1563 goto out; 1564 } 1565 1566 /* 1567 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1568 * first extract TransportID Parameter Data Length, and make sure 1569 * the value matches up to the SCSI expected data transfer length. 1570 */ 1571 tpdl = (buf[24] & 0xff) << 24; 1572 tpdl |= (buf[25] & 0xff) << 16; 1573 tpdl |= (buf[26] & 0xff) << 8; 1574 tpdl |= buf[27] & 0xff; 1575 1576 if ((tpdl + 28) != cmd->data_length) { 1577 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1578 " does not equal CDB data_length: %u\n", tpdl, 1579 cmd->data_length); 1580 ret = TCM_INVALID_PARAMETER_LIST; 1581 goto out_unmap; 1582 } 1583 /* 1584 * Start processing the received transport IDs using the 1585 * receiving I_T Nexus portal's fabric dependent methods to 1586 * obtain the SCSI Initiator Port/Device Identifiers. 1587 */ 1588 ptr = &buf[28]; 1589 1590 while (tpdl > 0) { 1591 struct se_lun *dest_lun, *tmp_lun; 1592 1593 proto_ident = (ptr[0] & 0x0f); 1594 dest_tpg = NULL; 1595 1596 spin_lock(&dev->se_port_lock); 1597 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1598 tmp_tpg = tmp_lun->lun_tpg; 1599 1600 /* 1601 * Look for the matching proto_ident provided by 1602 * the received TransportID 1603 */ 1604 if (tmp_tpg->proto_id != proto_ident) 1605 continue; 1606 dest_rtpi = tmp_lun->lun_rtpi; 1607 1608 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1609 (const char *)ptr, &tid_len, &iport_ptr); 1610 if (!i_str) 1611 continue; 1612 1613 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1614 spin_unlock(&dev->se_port_lock); 1615 1616 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1617 pr_err(" core_scsi3_tpg_depend_item()" 1618 " for tmp_tpg\n"); 1619 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1620 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1621 goto out_unmap; 1622 } 1623 /* 1624 * Locate the destination initiator ACL to be registered 1625 * from the decoded fabric module specific TransportID 1626 * at *i_str. 1627 */ 1628 mutex_lock(&tmp_tpg->acl_node_mutex); 1629 dest_node_acl = __core_tpg_get_initiator_node_acl( 1630 tmp_tpg, i_str); 1631 if (dest_node_acl) 1632 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1633 mutex_unlock(&tmp_tpg->acl_node_mutex); 1634 1635 if (!dest_node_acl) { 1636 core_scsi3_tpg_undepend_item(tmp_tpg); 1637 spin_lock(&dev->se_port_lock); 1638 continue; 1639 } 1640 1641 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1642 pr_err("configfs_depend_item() failed" 1643 " for dest_node_acl->acl_group\n"); 1644 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1645 core_scsi3_tpg_undepend_item(tmp_tpg); 1646 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1647 goto out_unmap; 1648 } 1649 1650 dest_tpg = tmp_tpg; 1651 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1652 " %s Port RTPI: %hu\n", 1653 dest_tpg->se_tpg_tfo->get_fabric_name(), 1654 dest_node_acl->initiatorname, dest_rtpi); 1655 1656 spin_lock(&dev->se_port_lock); 1657 break; 1658 } 1659 spin_unlock(&dev->se_port_lock); 1660 1661 if (!dest_tpg) { 1662 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1663 " dest_tpg\n"); 1664 ret = TCM_INVALID_PARAMETER_LIST; 1665 goto out_unmap; 1666 } 1667 1668 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1669 " tid_len: %d for %s + %s\n", 1670 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1671 tpdl, tid_len, i_str, iport_ptr); 1672 1673 if (tid_len > tpdl) { 1674 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1675 " %u for Transport ID: %s\n", tid_len, ptr); 1676 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1677 core_scsi3_tpg_undepend_item(dest_tpg); 1678 ret = TCM_INVALID_PARAMETER_LIST; 1679 goto out_unmap; 1680 } 1681 /* 1682 * Locate the desintation struct se_dev_entry pointer for matching 1683 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1684 * Target Port. 1685 */ 1686 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1687 dest_rtpi); 1688 if (!dest_se_deve) { 1689 pr_err("Unable to locate %s dest_se_deve" 1690 " from destination RTPI: %hu\n", 1691 dest_tpg->se_tpg_tfo->get_fabric_name(), 1692 dest_rtpi); 1693 1694 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1695 core_scsi3_tpg_undepend_item(dest_tpg); 1696 ret = TCM_INVALID_PARAMETER_LIST; 1697 goto out_unmap; 1698 } 1699 1700 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1701 pr_err("core_scsi3_lunacl_depend_item()" 1702 " failed\n"); 1703 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1704 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1705 core_scsi3_tpg_undepend_item(dest_tpg); 1706 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1707 goto out_unmap; 1708 } 1709 1710 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1711 " dest_se_deve mapped_lun: %llu\n", 1712 dest_tpg->se_tpg_tfo->get_fabric_name(), 1713 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1714 1715 /* 1716 * Skip any TransportIDs that already have a registration for 1717 * this target port. 1718 */ 1719 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1720 iport_ptr); 1721 if (pr_reg_e) { 1722 core_scsi3_put_pr_reg(pr_reg_e); 1723 core_scsi3_lunacl_undepend_item(dest_se_deve); 1724 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1725 core_scsi3_tpg_undepend_item(dest_tpg); 1726 ptr += tid_len; 1727 tpdl -= tid_len; 1728 tid_len = 0; 1729 continue; 1730 } 1731 /* 1732 * Allocate a struct pr_transport_id_holder and setup 1733 * the dest_node_acl and dest_se_deve pointers for the 1734 * loop below. 1735 */ 1736 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1737 GFP_KERNEL); 1738 if (!tidh_new) { 1739 pr_err("Unable to allocate tidh_new\n"); 1740 core_scsi3_lunacl_undepend_item(dest_se_deve); 1741 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1742 core_scsi3_tpg_undepend_item(dest_tpg); 1743 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1744 goto out_unmap; 1745 } 1746 INIT_LIST_HEAD(&tidh_new->dest_list); 1747 tidh_new->dest_tpg = dest_tpg; 1748 tidh_new->dest_node_acl = dest_node_acl; 1749 tidh_new->dest_se_deve = dest_se_deve; 1750 1751 /* 1752 * Allocate, but do NOT add the registration for the 1753 * TransportID referenced SCSI Initiator port. This 1754 * done because of the following from spc4r17 in section 1755 * 6.14.3 wrt SPEC_I_PT: 1756 * 1757 * "If a registration fails for any initiator port (e.g., if th 1758 * logical unit does not have enough resources available to 1759 * hold the registration information), no registrations shall be 1760 * made, and the command shall be terminated with 1761 * CHECK CONDITION status." 1762 * 1763 * That means we call __core_scsi3_alloc_registration() here, 1764 * and then call __core_scsi3_add_registration() in the 1765 * 2nd loop which will never fail. 1766 */ 1767 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1768 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 1769 1770 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1771 dest_node_acl, dest_lun, dest_se_deve, 1772 dest_se_deve->mapped_lun, iport_ptr, 1773 sa_res_key, all_tg_pt, aptpl); 1774 if (!dest_pr_reg) { 1775 core_scsi3_lunacl_undepend_item(dest_se_deve); 1776 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1777 core_scsi3_tpg_undepend_item(dest_tpg); 1778 kfree(tidh_new); 1779 ret = TCM_INVALID_PARAMETER_LIST; 1780 goto out_unmap; 1781 } 1782 tidh_new->dest_pr_reg = dest_pr_reg; 1783 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1784 1785 ptr += tid_len; 1786 tpdl -= tid_len; 1787 tid_len = 0; 1788 1789 } 1790 1791 transport_kunmap_data_sg(cmd); 1792 1793 /* 1794 * Go ahead and create a registrations from tid_dest_list for the 1795 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1796 * and dest_se_deve. 1797 * 1798 * The SA Reservation Key from the PROUT is set for the 1799 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1800 * means that the TransportID Initiator port will be 1801 * registered on all of the target ports in the SCSI target device 1802 * ALL_TG_PT=0 means the registration will only be for the 1803 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1804 * was received. 1805 */ 1806 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1807 dest_tpg = tidh->dest_tpg; 1808 dest_node_acl = tidh->dest_node_acl; 1809 dest_se_deve = tidh->dest_se_deve; 1810 dest_pr_reg = tidh->dest_pr_reg; 1811 1812 list_del(&tidh->dest_list); 1813 kfree(tidh); 1814 1815 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1816 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1817 1818 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1819 dest_pr_reg, 0, 0); 1820 1821 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1822 " registered Transport ID for Node: %s%s Mapped LUN:" 1823 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1824 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1825 dest_se_deve->mapped_lun : 0); 1826 1827 if (!dest_se_deve) { 1828 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1829 target_pr_kref_release); 1830 continue; 1831 } 1832 core_scsi3_lunacl_undepend_item(dest_se_deve); 1833 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1834 core_scsi3_tpg_undepend_item(dest_tpg); 1835 } 1836 1837 return 0; 1838 out_unmap: 1839 transport_kunmap_data_sg(cmd); 1840 out: 1841 /* 1842 * For the failure case, release everything from tid_dest_list 1843 * including *dest_pr_reg and the configfs dependances.. 1844 */ 1845 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1846 dest_tpg = tidh->dest_tpg; 1847 dest_node_acl = tidh->dest_node_acl; 1848 dest_se_deve = tidh->dest_se_deve; 1849 dest_pr_reg = tidh->dest_pr_reg; 1850 1851 list_del(&tidh->dest_list); 1852 kfree(tidh); 1853 /* 1854 * Release any extra ALL_TG_PT=1 registrations for 1855 * the SPEC_I_PT=1 case. 1856 */ 1857 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1858 &dest_pr_reg->pr_reg_atp_list, 1859 pr_reg_atp_mem_list) { 1860 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1861 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1862 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1863 } 1864 1865 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1866 1867 if (!dest_se_deve) { 1868 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1869 target_pr_kref_release); 1870 continue; 1871 } 1872 core_scsi3_lunacl_undepend_item(dest_se_deve); 1873 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1874 core_scsi3_tpg_undepend_item(dest_tpg); 1875 } 1876 return ret; 1877 } 1878 1879 static int core_scsi3_update_aptpl_buf( 1880 struct se_device *dev, 1881 unsigned char *buf, 1882 u32 pr_aptpl_buf_len) 1883 { 1884 struct se_portal_group *tpg; 1885 struct t10_pr_registration *pr_reg; 1886 unsigned char tmp[512], isid_buf[32]; 1887 ssize_t len = 0; 1888 int reg_count = 0; 1889 int ret = 0; 1890 1891 spin_lock(&dev->dev_reservation_lock); 1892 spin_lock(&dev->t10_pr.registration_lock); 1893 /* 1894 * Walk the registration list.. 1895 */ 1896 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1897 pr_reg_list) { 1898 1899 tmp[0] = '\0'; 1900 isid_buf[0] = '\0'; 1901 tpg = pr_reg->pr_reg_nacl->se_tpg; 1902 /* 1903 * Write out any ISID value to APTPL metadata that was included 1904 * in the original registration. 1905 */ 1906 if (pr_reg->isid_present_at_reg) 1907 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1908 pr_reg->pr_reg_isid); 1909 /* 1910 * Include special metadata if the pr_reg matches the 1911 * reservation holder. 1912 */ 1913 if (dev->dev_pr_res_holder == pr_reg) { 1914 snprintf(tmp, 512, "PR_REG_START: %d" 1915 "\ninitiator_fabric=%s\n" 1916 "initiator_node=%s\n%s" 1917 "sa_res_key=%llu\n" 1918 "res_holder=1\nres_type=%02x\n" 1919 "res_scope=%02x\nres_all_tg_pt=%d\n" 1920 "mapped_lun=%llu\n", reg_count, 1921 tpg->se_tpg_tfo->get_fabric_name(), 1922 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1923 pr_reg->pr_res_key, pr_reg->pr_res_type, 1924 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1925 pr_reg->pr_res_mapped_lun); 1926 } else { 1927 snprintf(tmp, 512, "PR_REG_START: %d\n" 1928 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1929 "sa_res_key=%llu\nres_holder=0\n" 1930 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1931 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1932 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1933 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1934 pr_reg->pr_res_mapped_lun); 1935 } 1936 1937 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1938 pr_err("Unable to update renaming APTPL metadata," 1939 " reallocating larger buffer\n"); 1940 ret = -EMSGSIZE; 1941 goto out; 1942 } 1943 len += sprintf(buf+len, "%s", tmp); 1944 1945 /* 1946 * Include information about the associated SCSI target port. 1947 */ 1948 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1949 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1950 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1951 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1952 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1953 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1954 reg_count); 1955 1956 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1957 pr_err("Unable to update renaming APTPL metadata," 1958 " reallocating larger buffer\n"); 1959 ret = -EMSGSIZE; 1960 goto out; 1961 } 1962 len += sprintf(buf+len, "%s", tmp); 1963 reg_count++; 1964 } 1965 1966 if (!reg_count) 1967 len += sprintf(buf+len, "No Registrations or Reservations"); 1968 1969 out: 1970 spin_unlock(&dev->t10_pr.registration_lock); 1971 spin_unlock(&dev->dev_reservation_lock); 1972 1973 return ret; 1974 } 1975 1976 static int __core_scsi3_write_aptpl_to_file( 1977 struct se_device *dev, 1978 unsigned char *buf) 1979 { 1980 struct t10_wwn *wwn = &dev->t10_wwn; 1981 struct file *file; 1982 int flags = O_RDWR | O_CREAT | O_TRUNC; 1983 char path[512]; 1984 u32 pr_aptpl_buf_len; 1985 int ret; 1986 1987 memset(path, 0, 512); 1988 1989 if (strlen(&wwn->unit_serial[0]) >= 512) { 1990 pr_err("WWN value for struct se_device does not fit" 1991 " into path buffer\n"); 1992 return -EMSGSIZE; 1993 } 1994 1995 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1996 file = filp_open(path, flags, 0600); 1997 if (IS_ERR(file)) { 1998 pr_err("filp_open(%s) for APTPL metadata" 1999 " failed\n", path); 2000 return PTR_ERR(file); 2001 } 2002 2003 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 2004 2005 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 2006 2007 if (ret < 0) 2008 pr_debug("Error writing APTPL metadata file: %s\n", path); 2009 fput(file); 2010 2011 return (ret < 0) ? -EIO : 0; 2012 } 2013 2014 /* 2015 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2016 * write out the updated metadata to struct file for this SCSI device. 2017 */ 2018 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2019 { 2020 unsigned char *buf; 2021 int rc, len = PR_APTPL_BUF_LEN; 2022 2023 if (!aptpl) { 2024 char *null_buf = "No Registrations or Reservations\n"; 2025 2026 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2027 dev->t10_pr.pr_aptpl_active = 0; 2028 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2029 2030 if (rc) 2031 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2032 2033 return 0; 2034 } 2035 retry: 2036 buf = vzalloc(len); 2037 if (!buf) 2038 return TCM_OUT_OF_RESOURCES; 2039 2040 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2041 if (rc < 0) { 2042 vfree(buf); 2043 len *= 2; 2044 goto retry; 2045 } 2046 2047 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2048 if (rc != 0) { 2049 pr_err("SPC-3 PR: Could not update APTPL\n"); 2050 vfree(buf); 2051 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2052 } 2053 dev->t10_pr.pr_aptpl_active = 1; 2054 vfree(buf); 2055 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2056 return 0; 2057 } 2058 2059 static sense_reason_t 2060 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2061 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2062 { 2063 struct se_session *se_sess = cmd->se_sess; 2064 struct se_device *dev = cmd->se_dev; 2065 struct se_lun *se_lun = cmd->se_lun; 2066 struct se_portal_group *se_tpg; 2067 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2068 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2069 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2070 sense_reason_t ret = TCM_NO_SENSE; 2071 int pr_holder = 0, type; 2072 2073 if (!se_sess || !se_lun) { 2074 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2075 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2076 } 2077 se_tpg = se_sess->se_tpg; 2078 2079 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2080 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2081 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2082 PR_REG_ISID_LEN); 2083 isid_ptr = &isid_buf[0]; 2084 } 2085 /* 2086 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2087 */ 2088 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2089 if (!pr_reg) { 2090 if (res_key) { 2091 pr_warn("SPC-3 PR: Reservation Key non-zero" 2092 " for SA REGISTER, returning CONFLICT\n"); 2093 return TCM_RESERVATION_CONFLICT; 2094 } 2095 /* 2096 * Do nothing but return GOOD status. 2097 */ 2098 if (!sa_res_key) 2099 return 0; 2100 2101 if (!spec_i_pt) { 2102 /* 2103 * Perform the Service Action REGISTER on the Initiator 2104 * Port Endpoint that the PRO was received from on the 2105 * Logical Unit of the SCSI device server. 2106 */ 2107 if (core_scsi3_alloc_registration(cmd->se_dev, 2108 se_sess->se_node_acl, cmd->se_lun, 2109 NULL, cmd->orig_fe_lun, isid_ptr, 2110 sa_res_key, all_tg_pt, aptpl, 2111 register_type, 0)) { 2112 pr_err("Unable to allocate" 2113 " struct t10_pr_registration\n"); 2114 return TCM_INVALID_PARAMETER_LIST; 2115 } 2116 } else { 2117 /* 2118 * Register both the Initiator port that received 2119 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2120 * TransportID from Parameter list and loop through 2121 * fabric dependent parameter list while calling 2122 * logic from of core_scsi3_alloc_registration() for 2123 * each TransportID provided SCSI Initiator Port/Device 2124 */ 2125 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2126 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2127 if (ret != 0) 2128 return ret; 2129 } 2130 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2131 } 2132 2133 /* ok, existing registration */ 2134 2135 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2136 pr_err("SPC-3 PR REGISTER: Received" 2137 " res_key: 0x%016Lx does not match" 2138 " existing SA REGISTER res_key:" 2139 " 0x%016Lx\n", res_key, 2140 pr_reg->pr_res_key); 2141 ret = TCM_RESERVATION_CONFLICT; 2142 goto out; 2143 } 2144 2145 if (spec_i_pt) { 2146 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2147 " set on a registered nexus\n"); 2148 ret = TCM_INVALID_PARAMETER_LIST; 2149 goto out; 2150 } 2151 2152 /* 2153 * An existing ALL_TG_PT=1 registration being released 2154 * must also set ALL_TG_PT=1 in the incoming PROUT. 2155 */ 2156 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2157 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2158 " registration exists, but ALL_TG_PT=1 bit not" 2159 " present in received PROUT\n"); 2160 ret = TCM_INVALID_CDB_FIELD; 2161 goto out; 2162 } 2163 2164 /* 2165 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2166 */ 2167 if (sa_res_key) { 2168 /* 2169 * Increment PRgeneration counter for struct se_device" 2170 * upon a successful REGISTER, see spc4r17 section 6.3.2 2171 * READ_KEYS service action. 2172 */ 2173 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2174 pr_reg->pr_res_key = sa_res_key; 2175 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2176 " Key for %s to: 0x%016Lx PRgeneration:" 2177 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2178 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2179 pr_reg->pr_reg_nacl->initiatorname, 2180 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2181 2182 } else { 2183 /* 2184 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2185 */ 2186 type = pr_reg->pr_res_type; 2187 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2188 pr_reg); 2189 if (pr_holder < 0) { 2190 ret = TCM_RESERVATION_CONFLICT; 2191 goto out; 2192 } 2193 2194 spin_lock(&pr_tmpl->registration_lock); 2195 /* 2196 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2197 * and matching pr_res_key. 2198 */ 2199 if (pr_reg->pr_reg_all_tg_pt) { 2200 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2201 &pr_tmpl->registration_list, 2202 pr_reg_list) { 2203 2204 if (!pr_reg_p->pr_reg_all_tg_pt) 2205 continue; 2206 if (pr_reg_p->pr_res_key != res_key) 2207 continue; 2208 if (pr_reg == pr_reg_p) 2209 continue; 2210 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2211 pr_reg_p->pr_reg_nacl->initiatorname)) 2212 continue; 2213 2214 __core_scsi3_free_registration(dev, 2215 pr_reg_p, NULL, 0); 2216 } 2217 } 2218 2219 /* 2220 * Release the calling I_T Nexus registration now.. 2221 */ 2222 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2223 pr_reg = NULL; 2224 2225 /* 2226 * From spc4r17, section 5.7.11.3 Unregistering 2227 * 2228 * If the persistent reservation is a registrants only 2229 * type, the device server shall establish a unit 2230 * attention condition for the initiator port associated 2231 * with every registered I_T nexus except for the I_T 2232 * nexus on which the PERSISTENT RESERVE OUT command was 2233 * received, with the additional sense code set to 2234 * RESERVATIONS RELEASED. 2235 */ 2236 if (pr_holder && 2237 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2238 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2239 list_for_each_entry(pr_reg_p, 2240 &pr_tmpl->registration_list, 2241 pr_reg_list) { 2242 2243 target_ua_allocate_lun( 2244 pr_reg_p->pr_reg_nacl, 2245 pr_reg_p->pr_res_mapped_lun, 2246 0x2A, 2247 ASCQ_2AH_RESERVATIONS_RELEASED); 2248 } 2249 } 2250 2251 spin_unlock(&pr_tmpl->registration_lock); 2252 } 2253 2254 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2255 2256 out: 2257 if (pr_reg) 2258 core_scsi3_put_pr_reg(pr_reg); 2259 return ret; 2260 } 2261 2262 unsigned char *core_scsi3_pr_dump_type(int type) 2263 { 2264 switch (type) { 2265 case PR_TYPE_WRITE_EXCLUSIVE: 2266 return "Write Exclusive Access"; 2267 case PR_TYPE_EXCLUSIVE_ACCESS: 2268 return "Exclusive Access"; 2269 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2270 return "Write Exclusive Access, Registrants Only"; 2271 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2272 return "Exclusive Access, Registrants Only"; 2273 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2274 return "Write Exclusive Access, All Registrants"; 2275 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2276 return "Exclusive Access, All Registrants"; 2277 default: 2278 break; 2279 } 2280 2281 return "Unknown SPC-3 PR Type"; 2282 } 2283 2284 static sense_reason_t 2285 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2286 { 2287 struct se_device *dev = cmd->se_dev; 2288 struct se_session *se_sess = cmd->se_sess; 2289 struct se_lun *se_lun = cmd->se_lun; 2290 struct t10_pr_registration *pr_reg, *pr_res_holder; 2291 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2292 char i_buf[PR_REG_ISID_ID_LEN]; 2293 sense_reason_t ret; 2294 2295 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2296 2297 if (!se_sess || !se_lun) { 2298 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2299 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2300 } 2301 /* 2302 * Locate the existing *pr_reg via struct se_node_acl pointers 2303 */ 2304 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2305 se_sess); 2306 if (!pr_reg) { 2307 pr_err("SPC-3 PR: Unable to locate" 2308 " PR_REGISTERED *pr_reg for RESERVE\n"); 2309 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2310 } 2311 /* 2312 * From spc4r17 Section 5.7.9: Reserving: 2313 * 2314 * An application client creates a persistent reservation by issuing 2315 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2316 * a registered I_T nexus with the following parameters: 2317 * a) RESERVATION KEY set to the value of the reservation key that is 2318 * registered with the logical unit for the I_T nexus; and 2319 */ 2320 if (res_key != pr_reg->pr_res_key) { 2321 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2322 " does not match existing SA REGISTER res_key:" 2323 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2324 ret = TCM_RESERVATION_CONFLICT; 2325 goto out_put_pr_reg; 2326 } 2327 /* 2328 * From spc4r17 Section 5.7.9: Reserving: 2329 * 2330 * From above: 2331 * b) TYPE field and SCOPE field set to the persistent reservation 2332 * being created. 2333 * 2334 * Only one persistent reservation is allowed at a time per logical unit 2335 * and that persistent reservation has a scope of LU_SCOPE. 2336 */ 2337 if (scope != PR_SCOPE_LU_SCOPE) { 2338 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2339 ret = TCM_INVALID_PARAMETER_LIST; 2340 goto out_put_pr_reg; 2341 } 2342 /* 2343 * See if we have an existing PR reservation holder pointer at 2344 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2345 * *pr_res_holder. 2346 */ 2347 spin_lock(&dev->dev_reservation_lock); 2348 pr_res_holder = dev->dev_pr_res_holder; 2349 if (pr_res_holder) { 2350 /* 2351 * From spc4r17 Section 5.7.9: Reserving: 2352 * 2353 * If the device server receives a PERSISTENT RESERVE OUT 2354 * command from an I_T nexus other than a persistent reservation 2355 * holder (see 5.7.10) that attempts to create a persistent 2356 * reservation when a persistent reservation already exists for 2357 * the logical unit, then the command shall be completed with 2358 * RESERVATION CONFLICT status. 2359 */ 2360 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2361 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2362 pr_err("SPC-3 PR: Attempted RESERVE from" 2363 " [%s]: %s while reservation already held by" 2364 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2365 cmd->se_tfo->get_fabric_name(), 2366 se_sess->se_node_acl->initiatorname, 2367 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2368 pr_res_holder->pr_reg_nacl->initiatorname); 2369 2370 spin_unlock(&dev->dev_reservation_lock); 2371 ret = TCM_RESERVATION_CONFLICT; 2372 goto out_put_pr_reg; 2373 } 2374 /* 2375 * From spc4r17 Section 5.7.9: Reserving: 2376 * 2377 * If a persistent reservation holder attempts to modify the 2378 * type or scope of an existing persistent reservation, the 2379 * command shall be completed with RESERVATION CONFLICT status. 2380 */ 2381 if ((pr_res_holder->pr_res_type != type) || 2382 (pr_res_holder->pr_res_scope != scope)) { 2383 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2384 pr_err("SPC-3 PR: Attempted RESERVE from" 2385 " [%s]: %s trying to change TYPE and/or SCOPE," 2386 " while reservation already held by [%s]: %s," 2387 " returning RESERVATION_CONFLICT\n", 2388 cmd->se_tfo->get_fabric_name(), 2389 se_sess->se_node_acl->initiatorname, 2390 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2391 pr_res_holder->pr_reg_nacl->initiatorname); 2392 2393 spin_unlock(&dev->dev_reservation_lock); 2394 ret = TCM_RESERVATION_CONFLICT; 2395 goto out_put_pr_reg; 2396 } 2397 /* 2398 * From spc4r17 Section 5.7.9: Reserving: 2399 * 2400 * If the device server receives a PERSISTENT RESERVE OUT 2401 * command with RESERVE service action where the TYPE field and 2402 * the SCOPE field contain the same values as the existing type 2403 * and scope from a persistent reservation holder, it shall not 2404 * make any change to the existing persistent reservation and 2405 * shall completethe command with GOOD status. 2406 */ 2407 spin_unlock(&dev->dev_reservation_lock); 2408 ret = 0; 2409 goto out_put_pr_reg; 2410 } 2411 /* 2412 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2413 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2414 */ 2415 pr_reg->pr_res_scope = scope; 2416 pr_reg->pr_res_type = type; 2417 pr_reg->pr_res_holder = 1; 2418 dev->dev_pr_res_holder = pr_reg; 2419 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2420 2421 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2422 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2423 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2424 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2425 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2426 cmd->se_tfo->get_fabric_name(), 2427 se_sess->se_node_acl->initiatorname, 2428 i_buf); 2429 spin_unlock(&dev->dev_reservation_lock); 2430 2431 if (pr_tmpl->pr_aptpl_active) 2432 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2433 2434 ret = 0; 2435 out_put_pr_reg: 2436 core_scsi3_put_pr_reg(pr_reg); 2437 return ret; 2438 } 2439 2440 static sense_reason_t 2441 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2442 u64 res_key) 2443 { 2444 switch (type) { 2445 case PR_TYPE_WRITE_EXCLUSIVE: 2446 case PR_TYPE_EXCLUSIVE_ACCESS: 2447 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2448 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2449 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2450 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2451 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2452 default: 2453 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2454 " 0x%02x\n", type); 2455 return TCM_INVALID_CDB_FIELD; 2456 } 2457 } 2458 2459 /* 2460 * Called with struct se_device->dev_reservation_lock held. 2461 */ 2462 static void __core_scsi3_complete_pro_release( 2463 struct se_device *dev, 2464 struct se_node_acl *se_nacl, 2465 struct t10_pr_registration *pr_reg, 2466 int explicit, 2467 int unreg) 2468 { 2469 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2470 char i_buf[PR_REG_ISID_ID_LEN]; 2471 int pr_res_type = 0, pr_res_scope = 0; 2472 2473 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2474 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2475 /* 2476 * Go ahead and release the current PR reservation holder. 2477 * If an All Registrants reservation is currently active and 2478 * a unregister operation is requested, replace the current 2479 * dev_pr_res_holder with another active registration. 2480 */ 2481 if (dev->dev_pr_res_holder) { 2482 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2483 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2484 dev->dev_pr_res_holder->pr_res_type = 0; 2485 dev->dev_pr_res_holder->pr_res_scope = 0; 2486 dev->dev_pr_res_holder->pr_res_holder = 0; 2487 dev->dev_pr_res_holder = NULL; 2488 } 2489 if (!unreg) 2490 goto out; 2491 2492 spin_lock(&dev->t10_pr.registration_lock); 2493 list_del_init(&pr_reg->pr_reg_list); 2494 /* 2495 * If the I_T nexus is a reservation holder, the persistent reservation 2496 * is of an all registrants type, and the I_T nexus is the last remaining 2497 * registered I_T nexus, then the device server shall also release the 2498 * persistent reservation. 2499 */ 2500 if (!list_empty(&dev->t10_pr.registration_list) && 2501 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2502 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2503 dev->dev_pr_res_holder = 2504 list_entry(dev->t10_pr.registration_list.next, 2505 struct t10_pr_registration, pr_reg_list); 2506 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2507 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2508 dev->dev_pr_res_holder->pr_res_holder = 1; 2509 } 2510 spin_unlock(&dev->t10_pr.registration_lock); 2511 out: 2512 if (!dev->dev_pr_res_holder) { 2513 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2514 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2515 tfo->get_fabric_name(), (explicit) ? "explicit" : 2516 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2517 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2518 } 2519 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2520 tfo->get_fabric_name(), se_nacl->initiatorname, 2521 i_buf); 2522 /* 2523 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2524 */ 2525 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2526 } 2527 2528 static sense_reason_t 2529 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2530 u64 res_key) 2531 { 2532 struct se_device *dev = cmd->se_dev; 2533 struct se_session *se_sess = cmd->se_sess; 2534 struct se_lun *se_lun = cmd->se_lun; 2535 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2536 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2537 sense_reason_t ret = 0; 2538 2539 if (!se_sess || !se_lun) { 2540 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2541 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2542 } 2543 /* 2544 * Locate the existing *pr_reg via struct se_node_acl pointers 2545 */ 2546 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2547 if (!pr_reg) { 2548 pr_err("SPC-3 PR: Unable to locate" 2549 " PR_REGISTERED *pr_reg for RELEASE\n"); 2550 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2551 } 2552 /* 2553 * From spc4r17 Section 5.7.11.2 Releasing: 2554 * 2555 * If there is no persistent reservation or in response to a persistent 2556 * reservation release request from a registered I_T nexus that is not a 2557 * persistent reservation holder (see 5.7.10), the device server shall 2558 * do the following: 2559 * 2560 * a) Not release the persistent reservation, if any; 2561 * b) Not remove any registrations; and 2562 * c) Complete the command with GOOD status. 2563 */ 2564 spin_lock(&dev->dev_reservation_lock); 2565 pr_res_holder = dev->dev_pr_res_holder; 2566 if (!pr_res_holder) { 2567 /* 2568 * No persistent reservation, return GOOD status. 2569 */ 2570 spin_unlock(&dev->dev_reservation_lock); 2571 goto out_put_pr_reg; 2572 } 2573 2574 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2575 /* 2576 * Release request from a registered I_T nexus that is not a 2577 * persistent reservation holder. return GOOD status. 2578 */ 2579 spin_unlock(&dev->dev_reservation_lock); 2580 goto out_put_pr_reg; 2581 } 2582 2583 /* 2584 * From spc4r17 Section 5.7.11.2 Releasing: 2585 * 2586 * Only the persistent reservation holder (see 5.7.10) is allowed to 2587 * release a persistent reservation. 2588 * 2589 * An application client releases the persistent reservation by issuing 2590 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2591 * an I_T nexus that is a persistent reservation holder with the 2592 * following parameters: 2593 * 2594 * a) RESERVATION KEY field set to the value of the reservation key 2595 * that is registered with the logical unit for the I_T nexus; 2596 */ 2597 if (res_key != pr_reg->pr_res_key) { 2598 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2599 " does not match existing SA REGISTER res_key:" 2600 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2601 spin_unlock(&dev->dev_reservation_lock); 2602 ret = TCM_RESERVATION_CONFLICT; 2603 goto out_put_pr_reg; 2604 } 2605 /* 2606 * From spc4r17 Section 5.7.11.2 Releasing and above: 2607 * 2608 * b) TYPE field and SCOPE field set to match the persistent 2609 * reservation being released. 2610 */ 2611 if ((pr_res_holder->pr_res_type != type) || 2612 (pr_res_holder->pr_res_scope != scope)) { 2613 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2614 pr_err("SPC-3 PR RELEASE: Attempted to release" 2615 " reservation from [%s]: %s with different TYPE " 2616 "and/or SCOPE while reservation already held by" 2617 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2618 cmd->se_tfo->get_fabric_name(), 2619 se_sess->se_node_acl->initiatorname, 2620 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2621 pr_res_holder->pr_reg_nacl->initiatorname); 2622 2623 spin_unlock(&dev->dev_reservation_lock); 2624 ret = TCM_RESERVATION_CONFLICT; 2625 goto out_put_pr_reg; 2626 } 2627 /* 2628 * In response to a persistent reservation release request from the 2629 * persistent reservation holder the device server shall perform a 2630 * release by doing the following as an uninterrupted series of actions: 2631 * a) Release the persistent reservation; 2632 * b) Not remove any registration(s); 2633 * c) If the released persistent reservation is a registrants only type 2634 * or all registrants type persistent reservation, 2635 * the device server shall establish a unit attention condition for 2636 * the initiator port associated with every regis- 2637 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2638 * RESERVE OUT command with RELEASE service action was received, 2639 * with the additional sense code set to RESERVATIONS RELEASED; and 2640 * d) If the persistent reservation is of any other type, the device 2641 * server shall not establish a unit attention condition. 2642 */ 2643 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2644 pr_reg, 1, 0); 2645 2646 spin_unlock(&dev->dev_reservation_lock); 2647 2648 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2649 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2650 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2651 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2652 /* 2653 * If no UNIT ATTENTION conditions will be established for 2654 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2655 * go ahead and check for APTPL=1 update+write below 2656 */ 2657 goto write_aptpl; 2658 } 2659 2660 spin_lock(&pr_tmpl->registration_lock); 2661 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2662 pr_reg_list) { 2663 /* 2664 * Do not establish a UNIT ATTENTION condition 2665 * for the calling I_T Nexus 2666 */ 2667 if (pr_reg_p == pr_reg) 2668 continue; 2669 2670 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2671 pr_reg_p->pr_res_mapped_lun, 2672 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2673 } 2674 spin_unlock(&pr_tmpl->registration_lock); 2675 2676 write_aptpl: 2677 if (pr_tmpl->pr_aptpl_active) 2678 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2679 2680 out_put_pr_reg: 2681 core_scsi3_put_pr_reg(pr_reg); 2682 return ret; 2683 } 2684 2685 static sense_reason_t 2686 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2687 { 2688 struct se_device *dev = cmd->se_dev; 2689 struct se_node_acl *pr_reg_nacl; 2690 struct se_session *se_sess = cmd->se_sess; 2691 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2692 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2693 u64 pr_res_mapped_lun = 0; 2694 int calling_it_nexus = 0; 2695 /* 2696 * Locate the existing *pr_reg via struct se_node_acl pointers 2697 */ 2698 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2699 se_sess->se_node_acl, se_sess); 2700 if (!pr_reg_n) { 2701 pr_err("SPC-3 PR: Unable to locate" 2702 " PR_REGISTERED *pr_reg for CLEAR\n"); 2703 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2704 } 2705 /* 2706 * From spc4r17 section 5.7.11.6, Clearing: 2707 * 2708 * Any application client may release the persistent reservation and 2709 * remove all registrations from a device server by issuing a 2710 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2711 * registered I_T nexus with the following parameter: 2712 * 2713 * a) RESERVATION KEY field set to the value of the reservation key 2714 * that is registered with the logical unit for the I_T nexus. 2715 */ 2716 if (res_key != pr_reg_n->pr_res_key) { 2717 pr_err("SPC-3 PR REGISTER: Received" 2718 " res_key: 0x%016Lx does not match" 2719 " existing SA REGISTER res_key:" 2720 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2721 core_scsi3_put_pr_reg(pr_reg_n); 2722 return TCM_RESERVATION_CONFLICT; 2723 } 2724 /* 2725 * a) Release the persistent reservation, if any; 2726 */ 2727 spin_lock(&dev->dev_reservation_lock); 2728 pr_res_holder = dev->dev_pr_res_holder; 2729 if (pr_res_holder) { 2730 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2731 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2732 pr_res_holder, 0, 0); 2733 } 2734 spin_unlock(&dev->dev_reservation_lock); 2735 /* 2736 * b) Remove all registration(s) (see spc4r17 5.7.7); 2737 */ 2738 spin_lock(&pr_tmpl->registration_lock); 2739 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2740 &pr_tmpl->registration_list, pr_reg_list) { 2741 2742 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2743 pr_reg_nacl = pr_reg->pr_reg_nacl; 2744 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2745 __core_scsi3_free_registration(dev, pr_reg, NULL, 2746 calling_it_nexus); 2747 /* 2748 * e) Establish a unit attention condition for the initiator 2749 * port associated with every registered I_T nexus other 2750 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2751 * command with CLEAR service action was received, with the 2752 * additional sense code set to RESERVATIONS PREEMPTED. 2753 */ 2754 if (!calling_it_nexus) 2755 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2756 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2757 } 2758 spin_unlock(&pr_tmpl->registration_lock); 2759 2760 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2761 cmd->se_tfo->get_fabric_name()); 2762 2763 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2764 2765 core_scsi3_pr_generation(dev); 2766 return 0; 2767 } 2768 2769 /* 2770 * Called with struct se_device->dev_reservation_lock held. 2771 */ 2772 static void __core_scsi3_complete_pro_preempt( 2773 struct se_device *dev, 2774 struct t10_pr_registration *pr_reg, 2775 struct list_head *preempt_and_abort_list, 2776 int type, 2777 int scope, 2778 enum preempt_type preempt_type) 2779 { 2780 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2781 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2782 char i_buf[PR_REG_ISID_ID_LEN]; 2783 2784 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2785 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2786 /* 2787 * Do an implicit RELEASE of the existing reservation. 2788 */ 2789 if (dev->dev_pr_res_holder) 2790 __core_scsi3_complete_pro_release(dev, nacl, 2791 dev->dev_pr_res_holder, 0, 0); 2792 2793 dev->dev_pr_res_holder = pr_reg; 2794 pr_reg->pr_res_holder = 1; 2795 pr_reg->pr_res_type = type; 2796 pr_reg->pr_res_scope = scope; 2797 2798 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2799 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2800 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2801 core_scsi3_pr_dump_type(type), 2802 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2803 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2804 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2805 nacl->initiatorname, i_buf); 2806 /* 2807 * For PREEMPT_AND_ABORT, add the preempting reservation's 2808 * struct t10_pr_registration to the list that will be compared 2809 * against received CDBs.. 2810 */ 2811 if (preempt_and_abort_list) 2812 list_add_tail(&pr_reg->pr_reg_abort_list, 2813 preempt_and_abort_list); 2814 } 2815 2816 static void core_scsi3_release_preempt_and_abort( 2817 struct list_head *preempt_and_abort_list, 2818 struct t10_pr_registration *pr_reg_holder) 2819 { 2820 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2821 2822 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2823 pr_reg_abort_list) { 2824 2825 list_del(&pr_reg->pr_reg_abort_list); 2826 if (pr_reg_holder == pr_reg) 2827 continue; 2828 if (pr_reg->pr_res_holder) { 2829 pr_warn("pr_reg->pr_res_holder still set\n"); 2830 continue; 2831 } 2832 2833 pr_reg->pr_reg_deve = NULL; 2834 pr_reg->pr_reg_nacl = NULL; 2835 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2836 } 2837 } 2838 2839 static sense_reason_t 2840 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2841 u64 sa_res_key, enum preempt_type preempt_type) 2842 { 2843 struct se_device *dev = cmd->se_dev; 2844 struct se_node_acl *pr_reg_nacl; 2845 struct se_session *se_sess = cmd->se_sess; 2846 LIST_HEAD(preempt_and_abort_list); 2847 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2848 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2849 u64 pr_res_mapped_lun = 0; 2850 int all_reg = 0, calling_it_nexus = 0; 2851 bool sa_res_key_unmatched = sa_res_key != 0; 2852 int prh_type = 0, prh_scope = 0; 2853 2854 if (!se_sess) 2855 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2856 2857 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2858 se_sess); 2859 if (!pr_reg_n) { 2860 pr_err("SPC-3 PR: Unable to locate" 2861 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2862 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2863 return TCM_RESERVATION_CONFLICT; 2864 } 2865 if (pr_reg_n->pr_res_key != res_key) { 2866 core_scsi3_put_pr_reg(pr_reg_n); 2867 return TCM_RESERVATION_CONFLICT; 2868 } 2869 if (scope != PR_SCOPE_LU_SCOPE) { 2870 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2871 core_scsi3_put_pr_reg(pr_reg_n); 2872 return TCM_INVALID_PARAMETER_LIST; 2873 } 2874 2875 spin_lock(&dev->dev_reservation_lock); 2876 pr_res_holder = dev->dev_pr_res_holder; 2877 if (pr_res_holder && 2878 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2879 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2880 all_reg = 1; 2881 2882 if (!all_reg && !sa_res_key) { 2883 spin_unlock(&dev->dev_reservation_lock); 2884 core_scsi3_put_pr_reg(pr_reg_n); 2885 return TCM_INVALID_PARAMETER_LIST; 2886 } 2887 /* 2888 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2889 * 2890 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2891 * persistent reservation holder or there is no persistent reservation 2892 * holder (i.e., there is no persistent reservation), then the device 2893 * server shall perform a preempt by doing the following in an 2894 * uninterrupted series of actions. (See below..) 2895 */ 2896 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2897 /* 2898 * No existing or SA Reservation Key matching reservations.. 2899 * 2900 * PROUT SA PREEMPT with All Registrant type reservations are 2901 * allowed to be processed without a matching SA Reservation Key 2902 */ 2903 spin_lock(&pr_tmpl->registration_lock); 2904 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2905 &pr_tmpl->registration_list, pr_reg_list) { 2906 /* 2907 * Removing of registrations in non all registrants 2908 * type reservations without a matching SA reservation 2909 * key. 2910 * 2911 * a) Remove the registrations for all I_T nexuses 2912 * specified by the SERVICE ACTION RESERVATION KEY 2913 * field; 2914 * b) Ignore the contents of the SCOPE and TYPE fields; 2915 * c) Process tasks as defined in 5.7.1; and 2916 * d) Establish a unit attention condition for the 2917 * initiator port associated with every I_T nexus 2918 * that lost its registration other than the I_T 2919 * nexus on which the PERSISTENT RESERVE OUT command 2920 * was received, with the additional sense code set 2921 * to REGISTRATIONS PREEMPTED. 2922 */ 2923 if (!all_reg) { 2924 if (pr_reg->pr_res_key != sa_res_key) 2925 continue; 2926 sa_res_key_unmatched = false; 2927 2928 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2929 pr_reg_nacl = pr_reg->pr_reg_nacl; 2930 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2931 __core_scsi3_free_registration(dev, pr_reg, 2932 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2933 NULL, calling_it_nexus); 2934 } else { 2935 /* 2936 * Case for any existing all registrants type 2937 * reservation, follow logic in spc4r17 section 2938 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2939 * 2940 * For a ZERO SA Reservation key, release 2941 * all other registrations and do an implicit 2942 * release of active persistent reservation. 2943 * 2944 * For a non-ZERO SA Reservation key, only 2945 * release the matching reservation key from 2946 * registrations. 2947 */ 2948 if ((sa_res_key) && 2949 (pr_reg->pr_res_key != sa_res_key)) 2950 continue; 2951 sa_res_key_unmatched = false; 2952 2953 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2954 if (calling_it_nexus) 2955 continue; 2956 2957 pr_reg_nacl = pr_reg->pr_reg_nacl; 2958 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2959 __core_scsi3_free_registration(dev, pr_reg, 2960 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2961 NULL, 0); 2962 } 2963 if (!calling_it_nexus) 2964 target_ua_allocate_lun(pr_reg_nacl, 2965 pr_res_mapped_lun, 0x2A, 2966 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2967 } 2968 spin_unlock(&pr_tmpl->registration_lock); 2969 /* 2970 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2971 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2972 * RESERVATION KEY field to a value that does not match any 2973 * registered reservation key, then the device server shall 2974 * complete the command with RESERVATION CONFLICT status. 2975 */ 2976 if (sa_res_key_unmatched) { 2977 spin_unlock(&dev->dev_reservation_lock); 2978 core_scsi3_put_pr_reg(pr_reg_n); 2979 return TCM_RESERVATION_CONFLICT; 2980 } 2981 /* 2982 * For an existing all registrants type reservation 2983 * with a zero SA rservation key, preempt the existing 2984 * reservation with the new PR type and scope. 2985 */ 2986 if (pr_res_holder && all_reg && !(sa_res_key)) { 2987 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2988 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2989 type, scope, preempt_type); 2990 2991 if (preempt_type == PREEMPT_AND_ABORT) 2992 core_scsi3_release_preempt_and_abort( 2993 &preempt_and_abort_list, pr_reg_n); 2994 } 2995 spin_unlock(&dev->dev_reservation_lock); 2996 2997 if (pr_tmpl->pr_aptpl_active) 2998 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2999 3000 core_scsi3_put_pr_reg(pr_reg_n); 3001 core_scsi3_pr_generation(cmd->se_dev); 3002 return 0; 3003 } 3004 /* 3005 * The PREEMPTing SA reservation key matches that of the 3006 * existing persistent reservation, first, we check if 3007 * we are preempting our own reservation. 3008 * From spc4r17, section 5.7.11.4.3 Preempting 3009 * persistent reservations and registration handling 3010 * 3011 * If an all registrants persistent reservation is not 3012 * present, it is not an error for the persistent 3013 * reservation holder to preempt itself (i.e., a 3014 * PERSISTENT RESERVE OUT with a PREEMPT service action 3015 * or a PREEMPT AND ABORT service action with the 3016 * SERVICE ACTION RESERVATION KEY value equal to the 3017 * persistent reservation holder's reservation key that 3018 * is received from the persistent reservation holder). 3019 * In that case, the device server shall establish the 3020 * new persistent reservation and maintain the 3021 * registration. 3022 */ 3023 prh_type = pr_res_holder->pr_res_type; 3024 prh_scope = pr_res_holder->pr_res_scope; 3025 /* 3026 * If the SERVICE ACTION RESERVATION KEY field identifies a 3027 * persistent reservation holder (see 5.7.10), the device 3028 * server shall perform a preempt by doing the following as 3029 * an uninterrupted series of actions: 3030 * 3031 * a) Release the persistent reservation for the holder 3032 * identified by the SERVICE ACTION RESERVATION KEY field; 3033 */ 3034 if (pr_reg_n != pr_res_holder) 3035 __core_scsi3_complete_pro_release(dev, 3036 pr_res_holder->pr_reg_nacl, 3037 dev->dev_pr_res_holder, 0, 0); 3038 /* 3039 * b) Remove the registrations for all I_T nexuses identified 3040 * by the SERVICE ACTION RESERVATION KEY field, except the 3041 * I_T nexus that is being used for the PERSISTENT RESERVE 3042 * OUT command. If an all registrants persistent reservation 3043 * is present and the SERVICE ACTION RESERVATION KEY field 3044 * is set to zero, then all registrations shall be removed 3045 * except for that of the I_T nexus that is being used for 3046 * the PERSISTENT RESERVE OUT command; 3047 */ 3048 spin_lock(&pr_tmpl->registration_lock); 3049 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3050 &pr_tmpl->registration_list, pr_reg_list) { 3051 3052 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3053 if (calling_it_nexus) 3054 continue; 3055 3056 if (pr_reg->pr_res_key != sa_res_key) 3057 continue; 3058 3059 pr_reg_nacl = pr_reg->pr_reg_nacl; 3060 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3061 __core_scsi3_free_registration(dev, pr_reg, 3062 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3063 calling_it_nexus); 3064 /* 3065 * e) Establish a unit attention condition for the initiator 3066 * port associated with every I_T nexus that lost its 3067 * persistent reservation and/or registration, with the 3068 * additional sense code set to REGISTRATIONS PREEMPTED; 3069 */ 3070 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3071 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3072 } 3073 spin_unlock(&pr_tmpl->registration_lock); 3074 /* 3075 * c) Establish a persistent reservation for the preempting 3076 * I_T nexus using the contents of the SCOPE and TYPE fields; 3077 */ 3078 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3079 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3080 type, scope, preempt_type); 3081 /* 3082 * d) Process tasks as defined in 5.7.1; 3083 * e) See above.. 3084 * f) If the type or scope has changed, then for every I_T nexus 3085 * whose reservation key was not removed, except for the I_T 3086 * nexus on which the PERSISTENT RESERVE OUT command was 3087 * received, the device server shall establish a unit 3088 * attention condition for the initiator port associated with 3089 * that I_T nexus, with the additional sense code set to 3090 * RESERVATIONS RELEASED. If the type or scope have not 3091 * changed, then no unit attention condition(s) shall be 3092 * established for this reason. 3093 */ 3094 if ((prh_type != type) || (prh_scope != scope)) { 3095 spin_lock(&pr_tmpl->registration_lock); 3096 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3097 &pr_tmpl->registration_list, pr_reg_list) { 3098 3099 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3100 if (calling_it_nexus) 3101 continue; 3102 3103 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3104 pr_reg->pr_res_mapped_lun, 0x2A, 3105 ASCQ_2AH_RESERVATIONS_RELEASED); 3106 } 3107 spin_unlock(&pr_tmpl->registration_lock); 3108 } 3109 spin_unlock(&dev->dev_reservation_lock); 3110 /* 3111 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3112 * All received CDBs for the matching existing reservation and 3113 * registrations undergo ABORT_TASK logic. 3114 * 3115 * From there, core_scsi3_release_preempt_and_abort() will 3116 * release every registration in the list (which have already 3117 * been removed from the primary pr_reg list), except the 3118 * new persistent reservation holder, the calling Initiator Port. 3119 */ 3120 if (preempt_type == PREEMPT_AND_ABORT) { 3121 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3122 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3123 pr_reg_n); 3124 } 3125 3126 if (pr_tmpl->pr_aptpl_active) 3127 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3128 3129 core_scsi3_put_pr_reg(pr_reg_n); 3130 core_scsi3_pr_generation(cmd->se_dev); 3131 return 0; 3132 } 3133 3134 static sense_reason_t 3135 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3136 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3137 { 3138 switch (type) { 3139 case PR_TYPE_WRITE_EXCLUSIVE: 3140 case PR_TYPE_EXCLUSIVE_ACCESS: 3141 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3142 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3143 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3144 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3145 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3146 sa_res_key, preempt_type); 3147 default: 3148 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3149 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3150 return TCM_INVALID_CDB_FIELD; 3151 } 3152 } 3153 3154 3155 static sense_reason_t 3156 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3157 u64 sa_res_key, int aptpl, int unreg) 3158 { 3159 struct se_session *se_sess = cmd->se_sess; 3160 struct se_device *dev = cmd->se_dev; 3161 struct se_dev_entry *dest_se_deve = NULL; 3162 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3163 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3164 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3165 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3166 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3167 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3168 unsigned char *buf; 3169 const unsigned char *initiator_str; 3170 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3171 u32 tid_len, tmp_tid_len; 3172 int new_reg = 0, type, scope, matching_iname; 3173 sense_reason_t ret; 3174 unsigned short rtpi; 3175 unsigned char proto_ident; 3176 3177 if (!se_sess || !se_lun) { 3178 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3179 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3180 } 3181 3182 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3183 se_tpg = se_sess->se_tpg; 3184 tf_ops = se_tpg->se_tpg_tfo; 3185 /* 3186 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3187 * Register behaviors for a REGISTER AND MOVE service action 3188 * 3189 * Locate the existing *pr_reg via struct se_node_acl pointers 3190 */ 3191 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3192 se_sess); 3193 if (!pr_reg) { 3194 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3195 " *pr_reg for REGISTER_AND_MOVE\n"); 3196 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3197 } 3198 /* 3199 * The provided reservation key much match the existing reservation key 3200 * provided during this initiator's I_T nexus registration. 3201 */ 3202 if (res_key != pr_reg->pr_res_key) { 3203 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3204 " res_key: 0x%016Lx does not match existing SA REGISTER" 3205 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3206 ret = TCM_RESERVATION_CONFLICT; 3207 goto out_put_pr_reg; 3208 } 3209 /* 3210 * The service active reservation key needs to be non zero 3211 */ 3212 if (!sa_res_key) { 3213 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3214 " sa_res_key\n"); 3215 ret = TCM_INVALID_PARAMETER_LIST; 3216 goto out_put_pr_reg; 3217 } 3218 3219 /* 3220 * Determine the Relative Target Port Identifier where the reservation 3221 * will be moved to for the TransportID containing SCSI initiator WWN 3222 * information. 3223 */ 3224 buf = transport_kmap_data_sg(cmd); 3225 if (!buf) { 3226 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3227 goto out_put_pr_reg; 3228 } 3229 3230 rtpi = (buf[18] & 0xff) << 8; 3231 rtpi |= buf[19] & 0xff; 3232 tid_len = (buf[20] & 0xff) << 24; 3233 tid_len |= (buf[21] & 0xff) << 16; 3234 tid_len |= (buf[22] & 0xff) << 8; 3235 tid_len |= buf[23] & 0xff; 3236 transport_kunmap_data_sg(cmd); 3237 buf = NULL; 3238 3239 if ((tid_len + 24) != cmd->data_length) { 3240 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3241 " does not equal CDB data_length: %u\n", tid_len, 3242 cmd->data_length); 3243 ret = TCM_INVALID_PARAMETER_LIST; 3244 goto out_put_pr_reg; 3245 } 3246 3247 spin_lock(&dev->se_port_lock); 3248 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3249 if (tmp_lun->lun_rtpi != rtpi) 3250 continue; 3251 dest_se_tpg = tmp_lun->lun_tpg; 3252 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3253 if (!dest_tf_ops) 3254 continue; 3255 3256 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3257 spin_unlock(&dev->se_port_lock); 3258 3259 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3260 pr_err("core_scsi3_tpg_depend_item() failed" 3261 " for dest_se_tpg\n"); 3262 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3263 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3264 goto out_put_pr_reg; 3265 } 3266 3267 spin_lock(&dev->se_port_lock); 3268 break; 3269 } 3270 spin_unlock(&dev->se_port_lock); 3271 3272 if (!dest_se_tpg || !dest_tf_ops) { 3273 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3274 " fabric ops from Relative Target Port Identifier:" 3275 " %hu\n", rtpi); 3276 ret = TCM_INVALID_PARAMETER_LIST; 3277 goto out_put_pr_reg; 3278 } 3279 3280 buf = transport_kmap_data_sg(cmd); 3281 if (!buf) { 3282 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3283 goto out_put_pr_reg; 3284 } 3285 proto_ident = (buf[24] & 0x0f); 3286 3287 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3288 " 0x%02x\n", proto_ident); 3289 3290 if (proto_ident != dest_se_tpg->proto_id) { 3291 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3292 " proto_ident: 0x%02x does not match ident: 0x%02x" 3293 " from fabric: %s\n", proto_ident, 3294 dest_se_tpg->proto_id, 3295 dest_tf_ops->get_fabric_name()); 3296 ret = TCM_INVALID_PARAMETER_LIST; 3297 goto out; 3298 } 3299 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3300 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3301 if (!initiator_str) { 3302 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3303 " initiator_str from Transport ID\n"); 3304 ret = TCM_INVALID_PARAMETER_LIST; 3305 goto out; 3306 } 3307 3308 transport_kunmap_data_sg(cmd); 3309 buf = NULL; 3310 3311 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3312 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3313 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3314 iport_ptr : ""); 3315 /* 3316 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3317 * action specifies a TransportID that is the same as the initiator port 3318 * of the I_T nexus for the command received, then the command shall 3319 * be terminated with CHECK CONDITION status, with the sense key set to 3320 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3321 * IN PARAMETER LIST. 3322 */ 3323 pr_reg_nacl = pr_reg->pr_reg_nacl; 3324 matching_iname = (!strcmp(initiator_str, 3325 pr_reg_nacl->initiatorname)) ? 1 : 0; 3326 if (!matching_iname) 3327 goto after_iport_check; 3328 3329 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3330 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3331 " matches: %s on received I_T Nexus\n", initiator_str, 3332 pr_reg_nacl->initiatorname); 3333 ret = TCM_INVALID_PARAMETER_LIST; 3334 goto out; 3335 } 3336 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3337 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3338 " matches: %s %s on received I_T Nexus\n", 3339 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3340 pr_reg->pr_reg_isid); 3341 ret = TCM_INVALID_PARAMETER_LIST; 3342 goto out; 3343 } 3344 after_iport_check: 3345 /* 3346 * Locate the destination struct se_node_acl from the received Transport ID 3347 */ 3348 mutex_lock(&dest_se_tpg->acl_node_mutex); 3349 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3350 initiator_str); 3351 if (dest_node_acl) 3352 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3353 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3354 3355 if (!dest_node_acl) { 3356 pr_err("Unable to locate %s dest_node_acl for" 3357 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3358 initiator_str); 3359 ret = TCM_INVALID_PARAMETER_LIST; 3360 goto out; 3361 } 3362 3363 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3364 pr_err("core_scsi3_nodeacl_depend_item() for" 3365 " dest_node_acl\n"); 3366 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3367 dest_node_acl = NULL; 3368 ret = TCM_INVALID_PARAMETER_LIST; 3369 goto out; 3370 } 3371 3372 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3373 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3374 dest_node_acl->initiatorname); 3375 3376 /* 3377 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3378 * PORT IDENTIFIER. 3379 */ 3380 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3381 if (!dest_se_deve) { 3382 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3383 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3384 ret = TCM_INVALID_PARAMETER_LIST; 3385 goto out; 3386 } 3387 3388 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3389 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3390 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3391 dest_se_deve = NULL; 3392 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3393 goto out; 3394 } 3395 3396 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3397 " ACL for dest_se_deve->mapped_lun: %llu\n", 3398 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3399 dest_se_deve->mapped_lun); 3400 3401 /* 3402 * A persistent reservation needs to already existing in order to 3403 * successfully complete the REGISTER_AND_MOVE service action.. 3404 */ 3405 spin_lock(&dev->dev_reservation_lock); 3406 pr_res_holder = dev->dev_pr_res_holder; 3407 if (!pr_res_holder) { 3408 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3409 " currently held\n"); 3410 spin_unlock(&dev->dev_reservation_lock); 3411 ret = TCM_INVALID_CDB_FIELD; 3412 goto out; 3413 } 3414 /* 3415 * The received on I_T Nexus must be the reservation holder. 3416 * 3417 * From spc4r17 section 5.7.8 Table 50 -- 3418 * Register behaviors for a REGISTER AND MOVE service action 3419 */ 3420 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3421 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3422 " Nexus is not reservation holder\n"); 3423 spin_unlock(&dev->dev_reservation_lock); 3424 ret = TCM_RESERVATION_CONFLICT; 3425 goto out; 3426 } 3427 /* 3428 * From spc4r17 section 5.7.8: registering and moving reservation 3429 * 3430 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3431 * action is received and the established persistent reservation is a 3432 * Write Exclusive - All Registrants type or Exclusive Access - 3433 * All Registrants type reservation, then the command shall be completed 3434 * with RESERVATION CONFLICT status. 3435 */ 3436 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3437 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3438 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3439 " reservation for type: %s\n", 3440 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3441 spin_unlock(&dev->dev_reservation_lock); 3442 ret = TCM_RESERVATION_CONFLICT; 3443 goto out; 3444 } 3445 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3446 /* 3447 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3448 */ 3449 type = pr_res_holder->pr_res_type; 3450 scope = pr_res_holder->pr_res_type; 3451 /* 3452 * c) Associate the reservation key specified in the SERVICE ACTION 3453 * RESERVATION KEY field with the I_T nexus specified as the 3454 * destination of the register and move, where: 3455 * A) The I_T nexus is specified by the TransportID and the 3456 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3457 * B) Regardless of the TransportID format used, the association for 3458 * the initiator port is based on either the initiator port name 3459 * (see 3.1.71) on SCSI transport protocols where port names are 3460 * required or the initiator port identifier (see 3.1.70) on SCSI 3461 * transport protocols where port names are not required; 3462 * d) Register the reservation key specified in the SERVICE ACTION 3463 * RESERVATION KEY field; 3464 * e) Retain the reservation key specified in the SERVICE ACTION 3465 * RESERVATION KEY field and associated information; 3466 * 3467 * Also, It is not an error for a REGISTER AND MOVE service action to 3468 * register an I_T nexus that is already registered with the same 3469 * reservation key or a different reservation key. 3470 */ 3471 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3472 iport_ptr); 3473 if (!dest_pr_reg) { 3474 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3475 atomic_read(&dest_se_deve->pr_kref.refcount) != 0); 3476 3477 spin_unlock(&dev->dev_reservation_lock); 3478 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3479 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3480 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3481 ret = TCM_INVALID_PARAMETER_LIST; 3482 goto out; 3483 } 3484 spin_lock(&dev->dev_reservation_lock); 3485 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3486 iport_ptr); 3487 new_reg = 1; 3488 } 3489 /* 3490 * f) Release the persistent reservation for the persistent reservation 3491 * holder (i.e., the I_T nexus on which the 3492 */ 3493 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3494 dev->dev_pr_res_holder, 0, 0); 3495 /* 3496 * g) Move the persistent reservation to the specified I_T nexus using 3497 * the same scope and type as the persistent reservation released in 3498 * item f); and 3499 */ 3500 dev->dev_pr_res_holder = dest_pr_reg; 3501 dest_pr_reg->pr_res_holder = 1; 3502 dest_pr_reg->pr_res_type = type; 3503 pr_reg->pr_res_scope = scope; 3504 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3505 /* 3506 * Increment PRGeneration for existing registrations.. 3507 */ 3508 if (!new_reg) 3509 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3510 spin_unlock(&dev->dev_reservation_lock); 3511 3512 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3513 " created new reservation holder TYPE: %s on object RTPI:" 3514 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3515 core_scsi3_pr_dump_type(type), rtpi, 3516 dest_pr_reg->pr_res_generation); 3517 pr_debug("SPC-3 PR Successfully moved reservation from" 3518 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3519 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3520 i_buf, dest_tf_ops->get_fabric_name(), 3521 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3522 iport_ptr : ""); 3523 /* 3524 * It is now safe to release configfs group dependencies for destination 3525 * of Transport ID Initiator Device/Port Identifier 3526 */ 3527 core_scsi3_lunacl_undepend_item(dest_se_deve); 3528 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3529 core_scsi3_tpg_undepend_item(dest_se_tpg); 3530 /* 3531 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3532 * nexus on which PERSISTENT RESERVE OUT command was received. 3533 */ 3534 if (unreg) { 3535 spin_lock(&pr_tmpl->registration_lock); 3536 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3537 spin_unlock(&pr_tmpl->registration_lock); 3538 } else 3539 core_scsi3_put_pr_reg(pr_reg); 3540 3541 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3542 3543 transport_kunmap_data_sg(cmd); 3544 3545 core_scsi3_put_pr_reg(dest_pr_reg); 3546 return 0; 3547 out: 3548 if (buf) 3549 transport_kunmap_data_sg(cmd); 3550 if (dest_se_deve) 3551 core_scsi3_lunacl_undepend_item(dest_se_deve); 3552 if (dest_node_acl) 3553 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3554 core_scsi3_tpg_undepend_item(dest_se_tpg); 3555 3556 out_put_pr_reg: 3557 core_scsi3_put_pr_reg(pr_reg); 3558 return ret; 3559 } 3560 3561 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3562 { 3563 unsigned int __v1, __v2; 3564 3565 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3566 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3567 3568 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3569 } 3570 3571 /* 3572 * See spc4r17 section 6.14 Table 170 3573 */ 3574 sense_reason_t 3575 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3576 { 3577 struct se_device *dev = cmd->se_dev; 3578 unsigned char *cdb = &cmd->t_task_cdb[0]; 3579 unsigned char *buf; 3580 u64 res_key, sa_res_key; 3581 int sa, scope, type, aptpl; 3582 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3583 sense_reason_t ret; 3584 3585 /* 3586 * Following spc2r20 5.5.1 Reservations overview: 3587 * 3588 * If a logical unit has been reserved by any RESERVE command and is 3589 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3590 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3591 * initiator or service action and shall terminate with a RESERVATION 3592 * CONFLICT status. 3593 */ 3594 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3595 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3596 " SPC-2 reservation is held, returning" 3597 " RESERVATION_CONFLICT\n"); 3598 return TCM_RESERVATION_CONFLICT; 3599 } 3600 3601 /* 3602 * FIXME: A NULL struct se_session pointer means an this is not coming from 3603 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3604 */ 3605 if (!cmd->se_sess) 3606 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3607 3608 if (cmd->data_length < 24) { 3609 pr_warn("SPC-PR: Received PR OUT parameter list" 3610 " length too small: %u\n", cmd->data_length); 3611 return TCM_INVALID_PARAMETER_LIST; 3612 } 3613 3614 /* 3615 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3616 */ 3617 sa = (cdb[1] & 0x1f); 3618 scope = (cdb[2] & 0xf0); 3619 type = (cdb[2] & 0x0f); 3620 3621 buf = transport_kmap_data_sg(cmd); 3622 if (!buf) 3623 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3624 3625 /* 3626 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3627 */ 3628 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3629 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3630 /* 3631 * REGISTER_AND_MOVE uses a different SA parameter list containing 3632 * SCSI TransportIDs. 3633 */ 3634 if (sa != PRO_REGISTER_AND_MOVE) { 3635 spec_i_pt = (buf[20] & 0x08); 3636 all_tg_pt = (buf[20] & 0x04); 3637 aptpl = (buf[20] & 0x01); 3638 } else { 3639 aptpl = (buf[17] & 0x01); 3640 unreg = (buf[17] & 0x02); 3641 } 3642 /* 3643 * If the backend device has been configured to force APTPL metadata 3644 * write-out, go ahead and propigate aptpl=1 down now. 3645 */ 3646 if (dev->dev_attrib.force_pr_aptpl) 3647 aptpl = 1; 3648 3649 transport_kunmap_data_sg(cmd); 3650 buf = NULL; 3651 3652 /* 3653 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3654 */ 3655 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3656 return TCM_INVALID_PARAMETER_LIST; 3657 3658 /* 3659 * From spc4r17 section 6.14: 3660 * 3661 * If the SPEC_I_PT bit is set to zero, the service action is not 3662 * REGISTER AND MOVE, and the parameter list length is not 24, then 3663 * the command shall be terminated with CHECK CONDITION status, with 3664 * the sense key set to ILLEGAL REQUEST, and the additional sense 3665 * code set to PARAMETER LIST LENGTH ERROR. 3666 */ 3667 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3668 (cmd->data_length != 24)) { 3669 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3670 " list length: %u\n", cmd->data_length); 3671 return TCM_INVALID_PARAMETER_LIST; 3672 } 3673 3674 /* 3675 * (core_scsi3_emulate_pro_* function parameters 3676 * are defined by spc4r17 Table 174: 3677 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3678 */ 3679 switch (sa) { 3680 case PRO_REGISTER: 3681 ret = core_scsi3_emulate_pro_register(cmd, 3682 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3683 break; 3684 case PRO_RESERVE: 3685 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3686 break; 3687 case PRO_RELEASE: 3688 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3689 break; 3690 case PRO_CLEAR: 3691 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3692 break; 3693 case PRO_PREEMPT: 3694 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3695 res_key, sa_res_key, PREEMPT); 3696 break; 3697 case PRO_PREEMPT_AND_ABORT: 3698 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3699 res_key, sa_res_key, PREEMPT_AND_ABORT); 3700 break; 3701 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3702 ret = core_scsi3_emulate_pro_register(cmd, 3703 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3704 break; 3705 case PRO_REGISTER_AND_MOVE: 3706 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3707 sa_res_key, aptpl, unreg); 3708 break; 3709 default: 3710 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3711 " action: 0x%02x\n", cdb[1] & 0x1f); 3712 return TCM_INVALID_CDB_FIELD; 3713 } 3714 3715 if (!ret) 3716 target_complete_cmd(cmd, GOOD); 3717 return ret; 3718 } 3719 3720 /* 3721 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3722 * 3723 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3724 */ 3725 static sense_reason_t 3726 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3727 { 3728 struct se_device *dev = cmd->se_dev; 3729 struct t10_pr_registration *pr_reg; 3730 unsigned char *buf; 3731 u32 add_len = 0, off = 8; 3732 3733 if (cmd->data_length < 8) { 3734 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3735 " too small\n", cmd->data_length); 3736 return TCM_INVALID_CDB_FIELD; 3737 } 3738 3739 buf = transport_kmap_data_sg(cmd); 3740 if (!buf) 3741 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3742 3743 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3744 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3745 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3746 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3747 3748 spin_lock(&dev->t10_pr.registration_lock); 3749 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3750 pr_reg_list) { 3751 /* 3752 * Check for overflow of 8byte PRI READ_KEYS payload and 3753 * next reservation key list descriptor. 3754 */ 3755 if ((add_len + 8) > (cmd->data_length - 8)) 3756 break; 3757 3758 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3759 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3760 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3761 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3762 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3763 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3764 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3765 buf[off++] = (pr_reg->pr_res_key & 0xff); 3766 3767 add_len += 8; 3768 } 3769 spin_unlock(&dev->t10_pr.registration_lock); 3770 3771 buf[4] = ((add_len >> 24) & 0xff); 3772 buf[5] = ((add_len >> 16) & 0xff); 3773 buf[6] = ((add_len >> 8) & 0xff); 3774 buf[7] = (add_len & 0xff); 3775 3776 transport_kunmap_data_sg(cmd); 3777 3778 return 0; 3779 } 3780 3781 /* 3782 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3783 * 3784 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3785 */ 3786 static sense_reason_t 3787 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3788 { 3789 struct se_device *dev = cmd->se_dev; 3790 struct t10_pr_registration *pr_reg; 3791 unsigned char *buf; 3792 u64 pr_res_key; 3793 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3794 3795 if (cmd->data_length < 8) { 3796 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3797 " too small\n", cmd->data_length); 3798 return TCM_INVALID_CDB_FIELD; 3799 } 3800 3801 buf = transport_kmap_data_sg(cmd); 3802 if (!buf) 3803 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3804 3805 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3806 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3807 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3808 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3809 3810 spin_lock(&dev->dev_reservation_lock); 3811 pr_reg = dev->dev_pr_res_holder; 3812 if (pr_reg) { 3813 /* 3814 * Set the hardcoded Additional Length 3815 */ 3816 buf[4] = ((add_len >> 24) & 0xff); 3817 buf[5] = ((add_len >> 16) & 0xff); 3818 buf[6] = ((add_len >> 8) & 0xff); 3819 buf[7] = (add_len & 0xff); 3820 3821 if (cmd->data_length < 22) 3822 goto err; 3823 3824 /* 3825 * Set the Reservation key. 3826 * 3827 * From spc4r17, section 5.7.10: 3828 * A persistent reservation holder has its reservation key 3829 * returned in the parameter data from a PERSISTENT 3830 * RESERVE IN command with READ RESERVATION service action as 3831 * follows: 3832 * a) For a persistent reservation of the type Write Exclusive 3833 * - All Registrants or Exclusive Access All Regitrants, 3834 * the reservation key shall be set to zero; or 3835 * b) For all other persistent reservation types, the 3836 * reservation key shall be set to the registered 3837 * reservation key for the I_T nexus that holds the 3838 * persistent reservation. 3839 */ 3840 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3841 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3842 pr_res_key = 0; 3843 else 3844 pr_res_key = pr_reg->pr_res_key; 3845 3846 buf[8] = ((pr_res_key >> 56) & 0xff); 3847 buf[9] = ((pr_res_key >> 48) & 0xff); 3848 buf[10] = ((pr_res_key >> 40) & 0xff); 3849 buf[11] = ((pr_res_key >> 32) & 0xff); 3850 buf[12] = ((pr_res_key >> 24) & 0xff); 3851 buf[13] = ((pr_res_key >> 16) & 0xff); 3852 buf[14] = ((pr_res_key >> 8) & 0xff); 3853 buf[15] = (pr_res_key & 0xff); 3854 /* 3855 * Set the SCOPE and TYPE 3856 */ 3857 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3858 (pr_reg->pr_res_type & 0x0f); 3859 } 3860 3861 err: 3862 spin_unlock(&dev->dev_reservation_lock); 3863 transport_kunmap_data_sg(cmd); 3864 3865 return 0; 3866 } 3867 3868 /* 3869 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3870 * 3871 * See spc4r17 section 6.13.4 Table 165 3872 */ 3873 static sense_reason_t 3874 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3875 { 3876 struct se_device *dev = cmd->se_dev; 3877 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3878 unsigned char *buf; 3879 u16 add_len = 8; /* Hardcoded to 8. */ 3880 3881 if (cmd->data_length < 6) { 3882 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3883 " %u too small\n", cmd->data_length); 3884 return TCM_INVALID_CDB_FIELD; 3885 } 3886 3887 buf = transport_kmap_data_sg(cmd); 3888 if (!buf) 3889 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3890 3891 buf[0] = ((add_len >> 8) & 0xff); 3892 buf[1] = (add_len & 0xff); 3893 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3894 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3895 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3896 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3897 /* 3898 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3899 * set the TMV: Task Mask Valid bit. 3900 */ 3901 buf[3] |= 0x80; 3902 /* 3903 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3904 */ 3905 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3906 /* 3907 * PTPL_A: Persistence across Target Power Loss Active bit 3908 */ 3909 if (pr_tmpl->pr_aptpl_active) 3910 buf[3] |= 0x01; 3911 /* 3912 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3913 */ 3914 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3915 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3916 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3917 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3918 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3919 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3920 3921 transport_kunmap_data_sg(cmd); 3922 3923 return 0; 3924 } 3925 3926 /* 3927 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3928 * 3929 * See spc4r17 section 6.13.5 Table 168 and 169 3930 */ 3931 static sense_reason_t 3932 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3933 { 3934 struct se_device *dev = cmd->se_dev; 3935 struct se_node_acl *se_nacl; 3936 struct se_portal_group *se_tpg; 3937 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3938 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3939 unsigned char *buf; 3940 u32 add_desc_len = 0, add_len = 0; 3941 u32 off = 8; /* off into first Full Status descriptor */ 3942 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3943 int exp_desc_len, desc_len; 3944 bool all_reg = false; 3945 3946 if (cmd->data_length < 8) { 3947 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3948 " too small\n", cmd->data_length); 3949 return TCM_INVALID_CDB_FIELD; 3950 } 3951 3952 buf = transport_kmap_data_sg(cmd); 3953 if (!buf) 3954 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3955 3956 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3957 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3958 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3959 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3960 3961 spin_lock(&dev->dev_reservation_lock); 3962 if (dev->dev_pr_res_holder) { 3963 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3964 3965 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3966 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3967 all_reg = true; 3968 pr_res_type = pr_holder->pr_res_type; 3969 pr_res_scope = pr_holder->pr_res_scope; 3970 } 3971 } 3972 spin_unlock(&dev->dev_reservation_lock); 3973 3974 spin_lock(&pr_tmpl->registration_lock); 3975 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3976 &pr_tmpl->registration_list, pr_reg_list) { 3977 3978 se_nacl = pr_reg->pr_reg_nacl; 3979 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3980 add_desc_len = 0; 3981 3982 atomic_inc_mb(&pr_reg->pr_res_holders); 3983 spin_unlock(&pr_tmpl->registration_lock); 3984 /* 3985 * Determine expected length of $FABRIC_MOD specific 3986 * TransportID full status descriptor.. 3987 */ 3988 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3989 &format_code); 3990 if (exp_desc_len < 0 || 3991 exp_desc_len + add_len > cmd->data_length) { 3992 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3993 " out of buffer: %d\n", cmd->data_length); 3994 spin_lock(&pr_tmpl->registration_lock); 3995 atomic_dec_mb(&pr_reg->pr_res_holders); 3996 break; 3997 } 3998 /* 3999 * Set RESERVATION KEY 4000 */ 4001 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4002 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4003 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4004 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4005 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4006 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4007 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4008 buf[off++] = (pr_reg->pr_res_key & 0xff); 4009 off += 4; /* Skip Over Reserved area */ 4010 4011 /* 4012 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4013 */ 4014 if (pr_reg->pr_reg_all_tg_pt) 4015 buf[off] = 0x02; 4016 /* 4017 * The struct se_lun pointer will be present for the 4018 * reservation holder for PR_HOLDER bit. 4019 * 4020 * Also, if this registration is the reservation 4021 * holder or there is an All Registrants reservation 4022 * active, fill in SCOPE and TYPE in the next byte. 4023 */ 4024 if (pr_reg->pr_res_holder) { 4025 buf[off++] |= 0x01; 4026 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4027 (pr_reg->pr_res_type & 0x0f); 4028 } else if (all_reg) { 4029 buf[off++] |= 0x01; 4030 buf[off++] = (pr_res_scope & 0xf0) | 4031 (pr_res_type & 0x0f); 4032 } else { 4033 off += 2; 4034 } 4035 4036 off += 4; /* Skip over reserved area */ 4037 /* 4038 * From spc4r17 6.3.15: 4039 * 4040 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4041 * IDENTIFIER field contains the relative port identifier (see 4042 * 3.1.120) of the target port that is part of the I_T nexus 4043 * described by this full status descriptor. If the ALL_TG_PT 4044 * bit is set to one, the contents of the RELATIVE TARGET PORT 4045 * IDENTIFIER field are not defined by this standard. 4046 */ 4047 if (!pr_reg->pr_reg_all_tg_pt) { 4048 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4049 4050 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4051 buf[off++] = (sep_rtpi & 0xff); 4052 } else 4053 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4054 4055 buf[off+4] = se_tpg->proto_id; 4056 4057 /* 4058 * Now, have the $FABRIC_MOD fill in the transport ID. 4059 */ 4060 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4061 &format_code, &buf[off+4]); 4062 4063 spin_lock(&pr_tmpl->registration_lock); 4064 atomic_dec_mb(&pr_reg->pr_res_holders); 4065 4066 if (desc_len < 0) 4067 break; 4068 /* 4069 * Set the ADDITIONAL DESCRIPTOR LENGTH 4070 */ 4071 buf[off++] = ((desc_len >> 24) & 0xff); 4072 buf[off++] = ((desc_len >> 16) & 0xff); 4073 buf[off++] = ((desc_len >> 8) & 0xff); 4074 buf[off++] = (desc_len & 0xff); 4075 /* 4076 * Size of full desctipor header minus TransportID 4077 * containing $FABRIC_MOD specific) initiator device/port 4078 * WWN information. 4079 * 4080 * See spc4r17 Section 6.13.5 Table 169 4081 */ 4082 add_desc_len = (24 + desc_len); 4083 4084 off += desc_len; 4085 add_len += add_desc_len; 4086 } 4087 spin_unlock(&pr_tmpl->registration_lock); 4088 /* 4089 * Set ADDITIONAL_LENGTH 4090 */ 4091 buf[4] = ((add_len >> 24) & 0xff); 4092 buf[5] = ((add_len >> 16) & 0xff); 4093 buf[6] = ((add_len >> 8) & 0xff); 4094 buf[7] = (add_len & 0xff); 4095 4096 transport_kunmap_data_sg(cmd); 4097 4098 return 0; 4099 } 4100 4101 sense_reason_t 4102 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4103 { 4104 sense_reason_t ret; 4105 4106 /* 4107 * Following spc2r20 5.5.1 Reservations overview: 4108 * 4109 * If a logical unit has been reserved by any RESERVE command and is 4110 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4111 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4112 * initiator or service action and shall terminate with a RESERVATION 4113 * CONFLICT status. 4114 */ 4115 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4116 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4117 " SPC-2 reservation is held, returning" 4118 " RESERVATION_CONFLICT\n"); 4119 return TCM_RESERVATION_CONFLICT; 4120 } 4121 4122 switch (cmd->t_task_cdb[1] & 0x1f) { 4123 case PRI_READ_KEYS: 4124 ret = core_scsi3_pri_read_keys(cmd); 4125 break; 4126 case PRI_READ_RESERVATION: 4127 ret = core_scsi3_pri_read_reservation(cmd); 4128 break; 4129 case PRI_REPORT_CAPABILITIES: 4130 ret = core_scsi3_pri_report_capabilities(cmd); 4131 break; 4132 case PRI_READ_FULL_STATUS: 4133 ret = core_scsi3_pri_read_full_status(cmd); 4134 break; 4135 default: 4136 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4137 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4138 return TCM_INVALID_CDB_FIELD; 4139 } 4140 4141 if (!ret) 4142 target_complete_cmd(cmd, GOOD); 4143 return ret; 4144 } 4145 4146 sense_reason_t 4147 target_check_reservation(struct se_cmd *cmd) 4148 { 4149 struct se_device *dev = cmd->se_dev; 4150 sense_reason_t ret; 4151 4152 if (!cmd->se_sess) 4153 return 0; 4154 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4155 return 0; 4156 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 4157 return 0; 4158 4159 spin_lock(&dev->dev_reservation_lock); 4160 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4161 ret = target_scsi2_reservation_check(cmd); 4162 else 4163 ret = target_scsi3_pr_reservation_check(cmd); 4164 spin_unlock(&dev->dev_reservation_lock); 4165 4166 return ret; 4167 } 4168