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 <linux/fcntl.h> 33 #include <linux/fs.h> 34 #include <scsi/scsi_proto.h> 35 #include <asm/unaligned.h> 36 37 #include <target/target_core_base.h> 38 #include <target/target_core_backend.h> 39 #include <target/target_core_fabric.h> 40 41 #include "target_core_internal.h" 42 #include "target_core_pr.h" 43 #include "target_core_ua.h" 44 45 /* 46 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 47 */ 48 struct pr_transport_id_holder { 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 void core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) 62 buf[0] = '\0'; 63 64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); 65 } 66 67 enum register_type { 68 REGISTER, 69 REGISTER_AND_IGNORE_EXISTING_KEY, 70 REGISTER_AND_MOVE, 71 }; 72 73 enum preempt_type { 74 PREEMPT, 75 PREEMPT_AND_ABORT, 76 }; 77 78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 79 struct t10_pr_registration *, int, int); 80 81 static int is_reservation_holder( 82 struct t10_pr_registration *pr_res_holder, 83 struct t10_pr_registration *pr_reg) 84 { 85 int pr_res_type; 86 87 if (pr_res_holder) { 88 pr_res_type = pr_res_holder->pr_res_type; 89 90 return pr_res_holder == pr_reg || 91 pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 92 pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; 93 } 94 return 0; 95 } 96 97 static sense_reason_t 98 target_scsi2_reservation_check(struct se_cmd *cmd) 99 { 100 struct se_device *dev = cmd->se_dev; 101 struct se_session *sess = cmd->se_sess; 102 103 switch (cmd->t_task_cdb[0]) { 104 case INQUIRY: 105 case RELEASE: 106 case RELEASE_10: 107 return 0; 108 default: 109 break; 110 } 111 112 if (!dev->dev_reserved_node_acl || !sess) 113 return 0; 114 115 if (dev->dev_reserved_node_acl != sess->se_node_acl) 116 return TCM_RESERVATION_CONFLICT; 117 118 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 119 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 120 return TCM_RESERVATION_CONFLICT; 121 } 122 123 return 0; 124 } 125 126 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 127 struct se_node_acl *, struct se_session *); 128 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 129 130 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 131 { 132 struct se_session *se_sess = cmd->se_sess; 133 struct se_device *dev = cmd->se_dev; 134 struct t10_pr_registration *pr_reg; 135 struct t10_reservation *pr_tmpl = &dev->t10_pr; 136 int conflict = 0; 137 138 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 139 se_sess); 140 if (pr_reg) { 141 /* 142 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 143 * behavior 144 * 145 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 146 * status, but no reservation shall be established and the 147 * persistent reservation shall not be changed, if the command 148 * is received from a) and b) below. 149 * 150 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 151 * status, but the persistent reservation shall not be released, 152 * if the command is received from a) and b) 153 * 154 * a) An I_T nexus that is a persistent reservation holder; or 155 * b) An I_T nexus that is registered if a registrants only or 156 * all registrants type persistent reservation is present. 157 * 158 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 159 * RELEASE(6) command, or RELEASE(10) command shall be processed 160 * as defined in SPC-2. 161 */ 162 if (pr_reg->pr_res_holder) { 163 core_scsi3_put_pr_reg(pr_reg); 164 return 1; 165 } 166 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 167 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 168 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 169 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 170 core_scsi3_put_pr_reg(pr_reg); 171 return 1; 172 } 173 core_scsi3_put_pr_reg(pr_reg); 174 conflict = 1; 175 } else { 176 /* 177 * Following spc2r20 5.5.1 Reservations overview: 178 * 179 * If a logical unit has executed a PERSISTENT RESERVE OUT 180 * command with the REGISTER or the REGISTER AND IGNORE 181 * EXISTING KEY service action and is still registered by any 182 * initiator, all RESERVE commands and all RELEASE commands 183 * regardless of initiator shall conflict and shall terminate 184 * with a RESERVATION CONFLICT status. 185 */ 186 spin_lock(&pr_tmpl->registration_lock); 187 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 188 spin_unlock(&pr_tmpl->registration_lock); 189 } 190 191 if (conflict) { 192 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 193 " while active SPC-3 registrations exist," 194 " returning RESERVATION_CONFLICT\n"); 195 return -EBUSY; 196 } 197 198 return 0; 199 } 200 201 sense_reason_t 202 target_scsi2_reservation_release(struct se_cmd *cmd) 203 { 204 struct se_device *dev = cmd->se_dev; 205 struct se_session *sess = cmd->se_sess; 206 struct se_portal_group *tpg; 207 int rc; 208 209 if (!sess || !sess->se_tpg) 210 goto out; 211 rc = target_check_scsi2_reservation_conflict(cmd); 212 if (rc == 1) 213 goto out; 214 if (rc < 0) 215 return TCM_RESERVATION_CONFLICT; 216 217 spin_lock(&dev->dev_reservation_lock); 218 if (!dev->dev_reserved_node_acl || !sess) 219 goto out_unlock; 220 221 if (dev->dev_reserved_node_acl != sess->se_node_acl) 222 goto out_unlock; 223 224 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 225 goto out_unlock; 226 227 dev->dev_reserved_node_acl = NULL; 228 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 229 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 230 dev->dev_res_bin_isid = 0; 231 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 232 } 233 tpg = sess->se_tpg; 234 pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" 235 " MAPPED LUN: %llu for %s\n", 236 tpg->se_tpg_tfo->get_fabric_name(), 237 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 238 sess->se_node_acl->initiatorname); 239 240 out_unlock: 241 spin_unlock(&dev->dev_reservation_lock); 242 out: 243 target_complete_cmd(cmd, GOOD); 244 return 0; 245 } 246 247 sense_reason_t 248 target_scsi2_reservation_reserve(struct se_cmd *cmd) 249 { 250 struct se_device *dev = cmd->se_dev; 251 struct se_session *sess = cmd->se_sess; 252 struct se_portal_group *tpg; 253 sense_reason_t ret = 0; 254 int rc; 255 256 if ((cmd->t_task_cdb[1] & 0x01) && 257 (cmd->t_task_cdb[1] & 0x02)) { 258 pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); 259 return TCM_UNSUPPORTED_SCSI_OPCODE; 260 } 261 /* 262 * This is currently the case for target_core_mod passthrough struct se_cmd 263 * ops 264 */ 265 if (!sess || !sess->se_tpg) 266 goto out; 267 rc = target_check_scsi2_reservation_conflict(cmd); 268 if (rc == 1) 269 goto out; 270 271 if (rc < 0) 272 return TCM_RESERVATION_CONFLICT; 273 274 tpg = sess->se_tpg; 275 spin_lock(&dev->dev_reservation_lock); 276 if (dev->dev_reserved_node_acl && 277 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 278 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 279 tpg->se_tpg_tfo->get_fabric_name()); 280 pr_err("Original reserver LUN: %llu %s\n", 281 cmd->se_lun->unpacked_lun, 282 dev->dev_reserved_node_acl->initiatorname); 283 pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" 284 " from %s \n", cmd->se_lun->unpacked_lun, 285 cmd->orig_fe_lun, 286 sess->se_node_acl->initiatorname); 287 ret = TCM_RESERVATION_CONFLICT; 288 goto out_unlock; 289 } 290 291 dev->dev_reserved_node_acl = sess->se_node_acl; 292 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 293 if (sess->sess_bin_isid != 0) { 294 dev->dev_res_bin_isid = sess->sess_bin_isid; 295 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 296 } 297 pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" 298 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 299 cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, 300 sess->se_node_acl->initiatorname); 301 302 out_unlock: 303 spin_unlock(&dev->dev_reservation_lock); 304 out: 305 if (!ret) 306 target_complete_cmd(cmd, GOOD); 307 return ret; 308 } 309 310 311 /* 312 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 313 * 314 * This function is called by those initiator ports who are *NOT* 315 * the active PR reservation holder when a reservation is present. 316 */ 317 static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, 318 bool isid_mismatch) 319 { 320 unsigned char *cdb = cmd->t_task_cdb; 321 struct se_session *se_sess = cmd->se_sess; 322 struct se_node_acl *nacl = se_sess->se_node_acl; 323 int other_cdb = 0; 324 int registered_nexus = 0, ret = 1; /* Conflict by default */ 325 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 326 int we = 0; /* Write Exclusive */ 327 int legacy = 0; /* Act like a legacy device and return 328 * RESERVATION CONFLICT on some CDBs */ 329 330 if (isid_mismatch) { 331 registered_nexus = 0; 332 } else { 333 struct se_dev_entry *se_deve; 334 335 rcu_read_lock(); 336 se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); 337 if (se_deve) 338 registered_nexus = test_bit(DEF_PR_REG_ACTIVE, 339 &se_deve->deve_flags); 340 rcu_read_unlock(); 341 } 342 343 switch (pr_reg_type) { 344 case PR_TYPE_WRITE_EXCLUSIVE: 345 we = 1; 346 case PR_TYPE_EXCLUSIVE_ACCESS: 347 /* 348 * Some commands are only allowed for the persistent reservation 349 * holder. 350 */ 351 break; 352 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 353 we = 1; 354 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 355 /* 356 * Some commands are only allowed for registered I_T Nexuses. 357 */ 358 reg_only = 1; 359 break; 360 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 361 we = 1; 362 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 363 /* 364 * Each registered I_T Nexus is a reservation holder. 365 */ 366 all_reg = 1; 367 break; 368 default: 369 return -EINVAL; 370 } 371 /* 372 * Referenced from spc4r17 table 45 for *NON* PR holder access 373 */ 374 switch (cdb[0]) { 375 case SECURITY_PROTOCOL_IN: 376 if (registered_nexus) 377 return 0; 378 ret = (we) ? 0 : 1; 379 break; 380 case MODE_SENSE: 381 case MODE_SENSE_10: 382 case READ_ATTRIBUTE: 383 case READ_BUFFER: 384 case RECEIVE_DIAGNOSTIC: 385 if (legacy) { 386 ret = 1; 387 break; 388 } 389 if (registered_nexus) { 390 ret = 0; 391 break; 392 } 393 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 394 break; 395 case PERSISTENT_RESERVE_OUT: 396 /* 397 * This follows PERSISTENT_RESERVE_OUT service actions that 398 * are allowed in the presence of various reservations. 399 * See spc4r17, table 46 400 */ 401 switch (cdb[1] & 0x1f) { 402 case PRO_CLEAR: 403 case PRO_PREEMPT: 404 case PRO_PREEMPT_AND_ABORT: 405 ret = (registered_nexus) ? 0 : 1; 406 break; 407 case PRO_REGISTER: 408 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 409 ret = 0; 410 break; 411 case PRO_REGISTER_AND_MOVE: 412 case PRO_RESERVE: 413 ret = 1; 414 break; 415 case PRO_RELEASE: 416 ret = (registered_nexus) ? 0 : 1; 417 break; 418 default: 419 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 420 " action: 0x%02x\n", cdb[1] & 0x1f); 421 return -EINVAL; 422 } 423 break; 424 case RELEASE: 425 case RELEASE_10: 426 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 427 ret = 0; 428 break; 429 case RESERVE: 430 case RESERVE_10: 431 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 432 ret = 0; 433 break; 434 case TEST_UNIT_READY: 435 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 436 break; 437 case MAINTENANCE_IN: 438 switch (cdb[1] & 0x1f) { 439 case MI_MANAGEMENT_PROTOCOL_IN: 440 if (registered_nexus) { 441 ret = 0; 442 break; 443 } 444 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 445 break; 446 case MI_REPORT_SUPPORTED_OPERATION_CODES: 447 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 448 if (legacy) { 449 ret = 1; 450 break; 451 } 452 if (registered_nexus) { 453 ret = 0; 454 break; 455 } 456 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 457 break; 458 case MI_REPORT_ALIASES: 459 case MI_REPORT_IDENTIFYING_INFORMATION: 460 case MI_REPORT_PRIORITY: 461 case MI_REPORT_TARGET_PGS: 462 case MI_REPORT_TIMESTAMP: 463 ret = 0; /* Allowed */ 464 break; 465 default: 466 pr_err("Unknown MI Service Action: 0x%02x\n", 467 (cdb[1] & 0x1f)); 468 return -EINVAL; 469 } 470 break; 471 case ACCESS_CONTROL_IN: 472 case ACCESS_CONTROL_OUT: 473 case INQUIRY: 474 case LOG_SENSE: 475 case SERVICE_ACTION_IN_12: 476 case REPORT_LUNS: 477 case REQUEST_SENSE: 478 case PERSISTENT_RESERVE_IN: 479 ret = 0; /*/ Allowed CDBs */ 480 break; 481 default: 482 other_cdb = 1; 483 break; 484 } 485 /* 486 * Case where the CDB is explicitly allowed in the above switch 487 * statement. 488 */ 489 if (!ret && !other_cdb) { 490 pr_debug("Allowing explicit CDB: 0x%02x for %s" 491 " reservation holder\n", cdb[0], 492 core_scsi3_pr_dump_type(pr_reg_type)); 493 494 return ret; 495 } 496 /* 497 * Check if write exclusive initiator ports *NOT* holding the 498 * WRITE_EXCLUSIVE_* reservation. 499 */ 500 if (we && !registered_nexus) { 501 if (cmd->data_direction == DMA_TO_DEVICE) { 502 /* 503 * Conflict for write exclusive 504 */ 505 pr_debug("%s Conflict for unregistered nexus" 506 " %s CDB: 0x%02x to %s reservation\n", 507 transport_dump_cmd_direction(cmd), 508 se_sess->se_node_acl->initiatorname, cdb[0], 509 core_scsi3_pr_dump_type(pr_reg_type)); 510 return 1; 511 } else { 512 /* 513 * Allow non WRITE CDBs for all Write Exclusive 514 * PR TYPEs to pass for registered and 515 * non-registered_nexuxes NOT holding the reservation. 516 * 517 * We only make noise for the unregisterd nexuses, 518 * as we expect registered non-reservation holding 519 * nexuses to issue CDBs. 520 */ 521 522 if (!registered_nexus) { 523 pr_debug("Allowing implicit CDB: 0x%02x" 524 " for %s reservation on unregistered" 525 " nexus\n", cdb[0], 526 core_scsi3_pr_dump_type(pr_reg_type)); 527 } 528 529 return 0; 530 } 531 } else if ((reg_only) || (all_reg)) { 532 if (registered_nexus) { 533 /* 534 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 535 * allow commands from registered nexuses. 536 */ 537 538 pr_debug("Allowing implicit CDB: 0x%02x for %s" 539 " reservation\n", cdb[0], 540 core_scsi3_pr_dump_type(pr_reg_type)); 541 542 return 0; 543 } 544 } else if (we && registered_nexus) { 545 /* 546 * Reads are allowed for Write Exclusive locks 547 * from all registrants. 548 */ 549 if (cmd->data_direction == DMA_FROM_DEVICE) { 550 pr_debug("Allowing READ CDB: 0x%02x for %s" 551 " reservation\n", cdb[0], 552 core_scsi3_pr_dump_type(pr_reg_type)); 553 554 return 0; 555 } 556 } 557 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 558 " for %s reservation\n", transport_dump_cmd_direction(cmd), 559 (registered_nexus) ? "" : "un", 560 se_sess->se_node_acl->initiatorname, cdb[0], 561 core_scsi3_pr_dump_type(pr_reg_type)); 562 563 return 1; /* Conflict by default */ 564 } 565 566 static sense_reason_t 567 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 568 { 569 struct se_device *dev = cmd->se_dev; 570 struct se_session *sess = cmd->se_sess; 571 u32 pr_reg_type; 572 bool isid_mismatch = false; 573 574 if (!dev->dev_pr_res_holder) 575 return 0; 576 577 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 578 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 579 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 580 goto check_nonholder; 581 582 if (dev->dev_pr_res_holder->isid_present_at_reg) { 583 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 584 sess->sess_bin_isid) { 585 isid_mismatch = true; 586 goto check_nonholder; 587 } 588 } 589 590 return 0; 591 592 check_nonholder: 593 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch)) 594 return TCM_RESERVATION_CONFLICT; 595 return 0; 596 } 597 598 static u32 core_scsi3_pr_generation(struct se_device *dev) 599 { 600 u32 prg; 601 602 /* 603 * PRGeneration field shall contain the value of a 32-bit wrapping 604 * counter mainted by the device server. 605 * 606 * Note that this is done regardless of Active Persist across 607 * Target PowerLoss (APTPL) 608 * 609 * See spc4r17 section 6.3.12 READ_KEYS service action 610 */ 611 spin_lock(&dev->dev_reservation_lock); 612 prg = dev->t10_pr.pr_generation++; 613 spin_unlock(&dev->dev_reservation_lock); 614 615 return prg; 616 } 617 618 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 619 struct se_device *dev, 620 struct se_node_acl *nacl, 621 struct se_lun *lun, 622 struct se_dev_entry *dest_deve, 623 u64 mapped_lun, 624 unsigned char *isid, 625 u64 sa_res_key, 626 int all_tg_pt, 627 int aptpl) 628 { 629 struct t10_pr_registration *pr_reg; 630 631 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 632 if (!pr_reg) { 633 pr_err("Unable to allocate struct t10_pr_registration\n"); 634 return NULL; 635 } 636 637 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 638 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 639 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 640 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 641 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 642 atomic_set(&pr_reg->pr_res_holders, 0); 643 pr_reg->pr_reg_nacl = nacl; 644 /* 645 * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1, 646 * the se_dev_entry->pr_ref will have been already obtained by 647 * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration(). 648 * 649 * Otherwise, locate se_dev_entry now and obtain a reference until 650 * registration completes in __core_scsi3_add_registration(). 651 */ 652 if (dest_deve) { 653 pr_reg->pr_reg_deve = dest_deve; 654 } else { 655 rcu_read_lock(); 656 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 657 if (!pr_reg->pr_reg_deve) { 658 rcu_read_unlock(); 659 pr_err("Unable to locate PR deve %s mapped_lun: %llu\n", 660 nacl->initiatorname, mapped_lun); 661 kmem_cache_free(t10_pr_reg_cache, pr_reg); 662 return NULL; 663 } 664 kref_get(&pr_reg->pr_reg_deve->pr_kref); 665 rcu_read_unlock(); 666 } 667 pr_reg->pr_res_mapped_lun = mapped_lun; 668 pr_reg->pr_aptpl_target_lun = lun->unpacked_lun; 669 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 670 pr_reg->pr_res_key = sa_res_key; 671 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 672 pr_reg->pr_reg_aptpl = aptpl; 673 /* 674 * If an ISID value for this SCSI Initiator Port exists, 675 * save it to the registration now. 676 */ 677 if (isid != NULL) { 678 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 679 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 680 pr_reg->isid_present_at_reg = 1; 681 } 682 683 return pr_reg; 684 } 685 686 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 687 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 688 689 /* 690 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 691 * modes. 692 */ 693 static struct t10_pr_registration *__core_scsi3_alloc_registration( 694 struct se_device *dev, 695 struct se_node_acl *nacl, 696 struct se_lun *lun, 697 struct se_dev_entry *deve, 698 u64 mapped_lun, 699 unsigned char *isid, 700 u64 sa_res_key, 701 int all_tg_pt, 702 int aptpl) 703 { 704 struct se_dev_entry *deve_tmp; 705 struct se_node_acl *nacl_tmp; 706 struct se_lun_acl *lacl_tmp; 707 struct se_lun *lun_tmp, *next, *dest_lun; 708 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 709 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 710 int ret; 711 /* 712 * Create a registration for the I_T Nexus upon which the 713 * PROUT REGISTER was received. 714 */ 715 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun, 716 isid, sa_res_key, all_tg_pt, 717 aptpl); 718 if (!pr_reg) 719 return NULL; 720 /* 721 * Return pointer to pr_reg for ALL_TG_PT=0 722 */ 723 if (!all_tg_pt) 724 return pr_reg; 725 /* 726 * Create list of matching SCSI Initiator Port registrations 727 * for ALL_TG_PT=1 728 */ 729 spin_lock(&dev->se_port_lock); 730 list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) { 731 if (!percpu_ref_tryget_live(&lun_tmp->lun_ref)) 732 continue; 733 spin_unlock(&dev->se_port_lock); 734 735 spin_lock(&lun_tmp->lun_deve_lock); 736 list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) { 737 /* 738 * This pointer will be NULL for demo mode MappedLUNs 739 * that have not been make explicit via a ConfigFS 740 * MappedLUN group for the SCSI Initiator Node ACL. 741 */ 742 if (!deve_tmp->se_lun_acl) 743 continue; 744 745 lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl, 746 lockdep_is_held(&lun_tmp->lun_deve_lock)); 747 nacl_tmp = lacl_tmp->se_lun_nacl; 748 /* 749 * Skip the matching struct se_node_acl that is allocated 750 * above.. 751 */ 752 if (nacl == nacl_tmp) 753 continue; 754 /* 755 * Only perform PR registrations for target ports on 756 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 757 * arrived. 758 */ 759 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 760 continue; 761 /* 762 * Look for a matching Initiator Node ACL in ASCII format 763 */ 764 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 765 continue; 766 767 kref_get(&deve_tmp->pr_kref); 768 spin_unlock(&lun_tmp->lun_deve_lock); 769 /* 770 * Grab a configfs group dependency that is released 771 * for the exception path at label out: below, or upon 772 * completion of adding ALL_TG_PT=1 registrations in 773 * __core_scsi3_add_registration() 774 */ 775 ret = core_scsi3_lunacl_depend_item(deve_tmp); 776 if (ret < 0) { 777 pr_err("core_scsi3_lunacl_depend" 778 "_item() failed\n"); 779 percpu_ref_put(&lun_tmp->lun_ref); 780 kref_put(&deve_tmp->pr_kref, target_pr_kref_release); 781 goto out; 782 } 783 /* 784 * Located a matching SCSI Initiator Port on a different 785 * port, allocate the pr_reg_atp and attach it to the 786 * pr_reg->pr_reg_atp_list that will be processed once 787 * the original *pr_reg is processed in 788 * __core_scsi3_add_registration() 789 */ 790 dest_lun = rcu_dereference_check(deve_tmp->se_lun, 791 kref_read(&deve_tmp->pr_kref) != 0); 792 793 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 794 nacl_tmp, dest_lun, deve_tmp, 795 deve_tmp->mapped_lun, NULL, 796 sa_res_key, all_tg_pt, aptpl); 797 if (!pr_reg_atp) { 798 percpu_ref_put(&lun_tmp->lun_ref); 799 core_scsi3_lunacl_undepend_item(deve_tmp); 800 goto out; 801 } 802 803 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 804 &pr_reg->pr_reg_atp_list); 805 spin_lock(&lun_tmp->lun_deve_lock); 806 } 807 spin_unlock(&lun_tmp->lun_deve_lock); 808 809 spin_lock(&dev->se_port_lock); 810 percpu_ref_put(&lun_tmp->lun_ref); 811 } 812 spin_unlock(&dev->se_port_lock); 813 814 return pr_reg; 815 out: 816 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 817 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 818 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 819 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 820 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 821 } 822 kmem_cache_free(t10_pr_reg_cache, pr_reg); 823 return NULL; 824 } 825 826 int core_scsi3_alloc_aptpl_registration( 827 struct t10_reservation *pr_tmpl, 828 u64 sa_res_key, 829 unsigned char *i_port, 830 unsigned char *isid, 831 u64 mapped_lun, 832 unsigned char *t_port, 833 u16 tpgt, 834 u64 target_lun, 835 int res_holder, 836 int all_tg_pt, 837 u8 type) 838 { 839 struct t10_pr_registration *pr_reg; 840 841 if (!i_port || !t_port || !sa_res_key) { 842 pr_err("Illegal parameters for APTPL registration\n"); 843 return -EINVAL; 844 } 845 846 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 847 if (!pr_reg) { 848 pr_err("Unable to allocate struct t10_pr_registration\n"); 849 return -ENOMEM; 850 } 851 852 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 853 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 854 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 855 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 856 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 857 atomic_set(&pr_reg->pr_res_holders, 0); 858 pr_reg->pr_reg_nacl = NULL; 859 pr_reg->pr_reg_deve = NULL; 860 pr_reg->pr_res_mapped_lun = mapped_lun; 861 pr_reg->pr_aptpl_target_lun = target_lun; 862 pr_reg->pr_res_key = sa_res_key; 863 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 864 pr_reg->pr_reg_aptpl = 1; 865 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 866 pr_reg->pr_res_type = type; 867 /* 868 * If an ISID value had been saved in APTPL metadata for this 869 * SCSI Initiator Port, restore it now. 870 */ 871 if (isid != NULL) { 872 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 873 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 874 pr_reg->isid_present_at_reg = 1; 875 } 876 /* 877 * Copy the i_port and t_port information from caller. 878 */ 879 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 880 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 881 pr_reg->pr_reg_tpgt = tpgt; 882 /* 883 * Set pr_res_holder from caller, the pr_reg who is the reservation 884 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 885 * the Initiator Node LUN ACL from the fabric module is created for 886 * this registration. 887 */ 888 pr_reg->pr_res_holder = res_holder; 889 890 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 891 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 892 " metadata\n", (res_holder) ? "+reservation" : ""); 893 return 0; 894 } 895 896 static void core_scsi3_aptpl_reserve( 897 struct se_device *dev, 898 struct se_portal_group *tpg, 899 struct se_node_acl *node_acl, 900 struct t10_pr_registration *pr_reg) 901 { 902 char i_buf[PR_REG_ISID_ID_LEN]; 903 904 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 905 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 906 907 spin_lock(&dev->dev_reservation_lock); 908 dev->dev_pr_res_holder = pr_reg; 909 spin_unlock(&dev->dev_reservation_lock); 910 911 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 912 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 913 tpg->se_tpg_tfo->get_fabric_name(), 914 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 915 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 916 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 917 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 918 i_buf); 919 } 920 921 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 922 struct t10_pr_registration *, enum register_type, int); 923 924 static int __core_scsi3_check_aptpl_registration( 925 struct se_device *dev, 926 struct se_portal_group *tpg, 927 struct se_lun *lun, 928 u64 target_lun, 929 struct se_node_acl *nacl, 930 u64 mapped_lun) 931 { 932 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 933 struct t10_reservation *pr_tmpl = &dev->t10_pr; 934 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 935 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 936 u16 tpgt; 937 938 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 939 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 940 /* 941 * Copy Initiator Port information from struct se_node_acl 942 */ 943 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 944 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 945 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 946 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 947 /* 948 * Look for the matching registrations+reservation from those 949 * created from APTPL metadata. Note that multiple registrations 950 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 951 * TransportIDs. 952 */ 953 spin_lock(&pr_tmpl->aptpl_reg_lock); 954 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 955 pr_reg_aptpl_list) { 956 957 if (!strcmp(pr_reg->pr_iport, i_port) && 958 (pr_reg->pr_res_mapped_lun == mapped_lun) && 959 !(strcmp(pr_reg->pr_tport, t_port)) && 960 (pr_reg->pr_reg_tpgt == tpgt) && 961 (pr_reg->pr_aptpl_target_lun == target_lun)) { 962 /* 963 * Obtain the ->pr_reg_deve pointer + reference, that 964 * is released by __core_scsi3_add_registration() below. 965 */ 966 rcu_read_lock(); 967 pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun); 968 if (!pr_reg->pr_reg_deve) { 969 pr_err("Unable to locate PR APTPL %s mapped_lun:" 970 " %llu\n", nacl->initiatorname, mapped_lun); 971 rcu_read_unlock(); 972 continue; 973 } 974 kref_get(&pr_reg->pr_reg_deve->pr_kref); 975 rcu_read_unlock(); 976 977 pr_reg->pr_reg_nacl = nacl; 978 pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi; 979 list_del(&pr_reg->pr_reg_aptpl_list); 980 spin_unlock(&pr_tmpl->aptpl_reg_lock); 981 /* 982 * At this point all of the pointers in *pr_reg will 983 * be setup, so go ahead and add the registration. 984 */ 985 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 986 /* 987 * If this registration is the reservation holder, 988 * make that happen now.. 989 */ 990 if (pr_reg->pr_res_holder) 991 core_scsi3_aptpl_reserve(dev, tpg, 992 nacl, pr_reg); 993 /* 994 * Reenable pr_aptpl_active to accept new metadata 995 * updates once the SCSI device is active again.. 996 */ 997 spin_lock(&pr_tmpl->aptpl_reg_lock); 998 pr_tmpl->pr_aptpl_active = 1; 999 } 1000 } 1001 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1002 1003 return 0; 1004 } 1005 1006 int core_scsi3_check_aptpl_registration( 1007 struct se_device *dev, 1008 struct se_portal_group *tpg, 1009 struct se_lun *lun, 1010 struct se_node_acl *nacl, 1011 u64 mapped_lun) 1012 { 1013 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 1014 return 0; 1015 1016 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1017 lun->unpacked_lun, nacl, 1018 mapped_lun); 1019 } 1020 1021 static void __core_scsi3_dump_registration( 1022 const struct target_core_fabric_ops *tfo, 1023 struct se_device *dev, 1024 struct se_node_acl *nacl, 1025 struct t10_pr_registration *pr_reg, 1026 enum register_type register_type) 1027 { 1028 struct se_portal_group *se_tpg = nacl->se_tpg; 1029 char i_buf[PR_REG_ISID_ID_LEN]; 1030 1031 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1032 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1033 1034 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1035 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 1036 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 1037 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1038 i_buf); 1039 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1040 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1041 tfo->tpg_get_tag(se_tpg)); 1042 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1043 " Port(s)\n", tfo->get_fabric_name(), 1044 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1045 dev->transport->name); 1046 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1047 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1048 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1049 pr_reg->pr_reg_aptpl); 1050 } 1051 1052 static void __core_scsi3_add_registration( 1053 struct se_device *dev, 1054 struct se_node_acl *nacl, 1055 struct t10_pr_registration *pr_reg, 1056 enum register_type register_type, 1057 int register_move) 1058 { 1059 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1060 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1061 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1062 struct se_dev_entry *deve; 1063 1064 /* 1065 * Increment PRgeneration counter for struct se_device upon a successful 1066 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1067 * 1068 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1069 * action, the struct se_device->dev_reservation_lock will already be held, 1070 * so we do not call core_scsi3_pr_generation() which grabs the lock 1071 * for the REGISTER. 1072 */ 1073 pr_reg->pr_res_generation = (register_move) ? 1074 dev->t10_pr.pr_generation++ : 1075 core_scsi3_pr_generation(dev); 1076 1077 spin_lock(&pr_tmpl->registration_lock); 1078 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1079 1080 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1081 spin_unlock(&pr_tmpl->registration_lock); 1082 /* 1083 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1084 */ 1085 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1086 goto out; 1087 /* 1088 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1089 * allocated in __core_scsi3_alloc_registration() 1090 */ 1091 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1092 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1093 struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl; 1094 1095 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1096 1097 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1098 1099 spin_lock(&pr_tmpl->registration_lock); 1100 list_add_tail(&pr_reg_tmp->pr_reg_list, 1101 &pr_tmpl->registration_list); 1102 1103 __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp, 1104 register_type); 1105 spin_unlock(&pr_tmpl->registration_lock); 1106 /* 1107 * Drop configfs group dependency reference and deve->pr_kref 1108 * obtained from __core_scsi3_alloc_registration() code. 1109 */ 1110 rcu_read_lock(); 1111 deve = pr_reg_tmp->pr_reg_deve; 1112 if (deve) { 1113 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1114 core_scsi3_lunacl_undepend_item(deve); 1115 pr_reg_tmp->pr_reg_deve = NULL; 1116 } 1117 rcu_read_unlock(); 1118 } 1119 out: 1120 /* 1121 * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration() 1122 */ 1123 rcu_read_lock(); 1124 deve = pr_reg->pr_reg_deve; 1125 if (deve) { 1126 set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1127 kref_put(&deve->pr_kref, target_pr_kref_release); 1128 pr_reg->pr_reg_deve = NULL; 1129 } 1130 rcu_read_unlock(); 1131 } 1132 1133 static int core_scsi3_alloc_registration( 1134 struct se_device *dev, 1135 struct se_node_acl *nacl, 1136 struct se_lun *lun, 1137 struct se_dev_entry *deve, 1138 u64 mapped_lun, 1139 unsigned char *isid, 1140 u64 sa_res_key, 1141 int all_tg_pt, 1142 int aptpl, 1143 enum register_type register_type, 1144 int register_move) 1145 { 1146 struct t10_pr_registration *pr_reg; 1147 1148 pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun, 1149 isid, sa_res_key, all_tg_pt, 1150 aptpl); 1151 if (!pr_reg) 1152 return -EPERM; 1153 1154 __core_scsi3_add_registration(dev, nacl, pr_reg, 1155 register_type, register_move); 1156 return 0; 1157 } 1158 1159 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1160 struct se_device *dev, 1161 struct se_node_acl *nacl, 1162 unsigned char *isid) 1163 { 1164 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1165 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1166 struct se_portal_group *tpg; 1167 1168 spin_lock(&pr_tmpl->registration_lock); 1169 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1170 &pr_tmpl->registration_list, pr_reg_list) { 1171 /* 1172 * First look for a matching struct se_node_acl 1173 */ 1174 if (pr_reg->pr_reg_nacl != nacl) 1175 continue; 1176 1177 tpg = pr_reg->pr_reg_nacl->se_tpg; 1178 /* 1179 * If this registration does NOT contain a fabric provided 1180 * ISID, then we have found a match. 1181 */ 1182 if (!pr_reg->isid_present_at_reg) { 1183 /* 1184 * Determine if this SCSI device server requires that 1185 * SCSI Intiatior TransportID w/ ISIDs is enforced 1186 * for fabric modules (iSCSI) requiring them. 1187 */ 1188 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1189 if (dev->dev_attrib.enforce_pr_isids) 1190 continue; 1191 } 1192 atomic_inc_mb(&pr_reg->pr_res_holders); 1193 spin_unlock(&pr_tmpl->registration_lock); 1194 return pr_reg; 1195 } 1196 /* 1197 * If the *pr_reg contains a fabric defined ISID for multi-value 1198 * SCSI Initiator Port TransportIDs, then we expect a valid 1199 * matching ISID to be provided by the local SCSI Initiator Port. 1200 */ 1201 if (!isid) 1202 continue; 1203 if (strcmp(isid, pr_reg->pr_reg_isid)) 1204 continue; 1205 1206 atomic_inc_mb(&pr_reg->pr_res_holders); 1207 spin_unlock(&pr_tmpl->registration_lock); 1208 return pr_reg; 1209 } 1210 spin_unlock(&pr_tmpl->registration_lock); 1211 1212 return NULL; 1213 } 1214 1215 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1216 struct se_device *dev, 1217 struct se_node_acl *nacl, 1218 struct se_session *sess) 1219 { 1220 struct se_portal_group *tpg = nacl->se_tpg; 1221 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1222 1223 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1224 memset(&buf[0], 0, PR_REG_ISID_LEN); 1225 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1226 PR_REG_ISID_LEN); 1227 isid_ptr = &buf[0]; 1228 } 1229 1230 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1231 } 1232 1233 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1234 { 1235 atomic_dec_mb(&pr_reg->pr_res_holders); 1236 } 1237 1238 static int core_scsi3_check_implicit_release( 1239 struct se_device *dev, 1240 struct t10_pr_registration *pr_reg) 1241 { 1242 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1243 struct t10_pr_registration *pr_res_holder; 1244 int ret = 0; 1245 1246 spin_lock(&dev->dev_reservation_lock); 1247 pr_res_holder = dev->dev_pr_res_holder; 1248 if (!pr_res_holder) { 1249 spin_unlock(&dev->dev_reservation_lock); 1250 return ret; 1251 } 1252 if (pr_res_holder == pr_reg) { 1253 /* 1254 * Perform an implicit RELEASE if the registration that 1255 * is being released is holding the reservation. 1256 * 1257 * From spc4r17, section 5.7.11.1: 1258 * 1259 * e) If the I_T nexus is the persistent reservation holder 1260 * and the persistent reservation is not an all registrants 1261 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1262 * service action or REGISTER AND IGNORE EXISTING KEY 1263 * service action with the SERVICE ACTION RESERVATION KEY 1264 * field set to zero (see 5.7.11.3). 1265 */ 1266 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1267 ret = 1; 1268 /* 1269 * For 'All Registrants' reservation types, all existing 1270 * registrations are still processed as reservation holders 1271 * in core_scsi3_pr_seq_non_holder() after the initial 1272 * reservation holder is implicitly released here. 1273 */ 1274 } else if (pr_reg->pr_reg_all_tg_pt && 1275 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1276 pr_reg->pr_reg_nacl->initiatorname)) && 1277 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1278 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1279 " UNREGISTER while existing reservation with matching" 1280 " key 0x%016Lx is present from another SCSI Initiator" 1281 " Port\n", pr_reg->pr_res_key); 1282 ret = -EPERM; 1283 } 1284 spin_unlock(&dev->dev_reservation_lock); 1285 1286 return ret; 1287 } 1288 1289 /* 1290 * Called with struct t10_reservation->registration_lock held. 1291 */ 1292 static void __core_scsi3_free_registration( 1293 struct se_device *dev, 1294 struct t10_pr_registration *pr_reg, 1295 struct list_head *preempt_and_abort_list, 1296 int dec_holders) 1297 __releases(&pr_tmpl->registration_lock) 1298 __acquires(&pr_tmpl->registration_lock) 1299 { 1300 const struct target_core_fabric_ops *tfo = 1301 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1302 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1303 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1304 struct se_dev_entry *deve; 1305 char i_buf[PR_REG_ISID_ID_LEN]; 1306 1307 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1308 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1309 1310 if (!list_empty(&pr_reg->pr_reg_list)) 1311 list_del(&pr_reg->pr_reg_list); 1312 /* 1313 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1314 * so call core_scsi3_put_pr_reg() to decrement our reference. 1315 */ 1316 if (dec_holders) 1317 core_scsi3_put_pr_reg(pr_reg); 1318 1319 spin_unlock(&pr_tmpl->registration_lock); 1320 /* 1321 * Wait until all reference from any other I_T nexuses for this 1322 * *pr_reg have been released. Because list_del() is called above, 1323 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1324 * count back to zero, and we release *pr_reg. 1325 */ 1326 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1327 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1328 tfo->get_fabric_name()); 1329 cpu_relax(); 1330 } 1331 1332 rcu_read_lock(); 1333 deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun); 1334 if (deve) 1335 clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags); 1336 rcu_read_unlock(); 1337 1338 spin_lock(&pr_tmpl->registration_lock); 1339 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1340 " Node: %s%s\n", tfo->get_fabric_name(), 1341 pr_reg->pr_reg_nacl->initiatorname, 1342 i_buf); 1343 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1344 " Port(s)\n", tfo->get_fabric_name(), 1345 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1346 dev->transport->name); 1347 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1348 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1349 pr_reg->pr_res_generation); 1350 1351 if (!preempt_and_abort_list) { 1352 pr_reg->pr_reg_deve = NULL; 1353 pr_reg->pr_reg_nacl = NULL; 1354 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1355 return; 1356 } 1357 /* 1358 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1359 * are released once the ABORT_TASK_SET has completed.. 1360 */ 1361 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1362 } 1363 1364 void core_scsi3_free_pr_reg_from_nacl( 1365 struct se_device *dev, 1366 struct se_node_acl *nacl) 1367 { 1368 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1369 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1370 bool free_reg = false; 1371 /* 1372 * If the passed se_node_acl matches the reservation holder, 1373 * release the reservation. 1374 */ 1375 spin_lock(&dev->dev_reservation_lock); 1376 pr_res_holder = dev->dev_pr_res_holder; 1377 if ((pr_res_holder != NULL) && 1378 (pr_res_holder->pr_reg_nacl == nacl)) { 1379 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1380 free_reg = true; 1381 } 1382 spin_unlock(&dev->dev_reservation_lock); 1383 /* 1384 * Release any registration associated with the struct se_node_acl. 1385 */ 1386 spin_lock(&pr_tmpl->registration_lock); 1387 if (pr_res_holder && free_reg) 1388 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1389 1390 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1391 &pr_tmpl->registration_list, pr_reg_list) { 1392 1393 if (pr_reg->pr_reg_nacl != nacl) 1394 continue; 1395 1396 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1397 } 1398 spin_unlock(&pr_tmpl->registration_lock); 1399 } 1400 1401 void core_scsi3_free_all_registrations( 1402 struct se_device *dev) 1403 { 1404 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1405 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1406 1407 spin_lock(&dev->dev_reservation_lock); 1408 pr_res_holder = dev->dev_pr_res_holder; 1409 if (pr_res_holder != NULL) { 1410 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1411 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1412 pr_res_holder, 0, 0); 1413 } 1414 spin_unlock(&dev->dev_reservation_lock); 1415 1416 spin_lock(&pr_tmpl->registration_lock); 1417 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1418 &pr_tmpl->registration_list, pr_reg_list) { 1419 1420 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1421 } 1422 spin_unlock(&pr_tmpl->registration_lock); 1423 1424 spin_lock(&pr_tmpl->aptpl_reg_lock); 1425 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1426 pr_reg_aptpl_list) { 1427 list_del(&pr_reg->pr_reg_aptpl_list); 1428 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1429 } 1430 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1431 } 1432 1433 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1434 { 1435 return target_depend_item(&tpg->tpg_group.cg_item); 1436 } 1437 1438 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1439 { 1440 target_undepend_item(&tpg->tpg_group.cg_item); 1441 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1442 } 1443 1444 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1445 { 1446 if (nacl->dynamic_node_acl) 1447 return 0; 1448 return target_depend_item(&nacl->acl_group.cg_item); 1449 } 1450 1451 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1452 { 1453 if (!nacl->dynamic_node_acl) 1454 target_undepend_item(&nacl->acl_group.cg_item); 1455 atomic_dec_mb(&nacl->acl_pr_ref_count); 1456 } 1457 1458 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1459 { 1460 struct se_lun_acl *lun_acl; 1461 1462 /* 1463 * For nacl->dynamic_node_acl=1 1464 */ 1465 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1466 kref_read(&se_deve->pr_kref) != 0); 1467 if (!lun_acl) 1468 return 0; 1469 1470 return target_depend_item(&lun_acl->se_lun_group.cg_item); 1471 } 1472 1473 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1474 { 1475 struct se_lun_acl *lun_acl; 1476 1477 /* 1478 * For nacl->dynamic_node_acl=1 1479 */ 1480 lun_acl = rcu_dereference_check(se_deve->se_lun_acl, 1481 kref_read(&se_deve->pr_kref) != 0); 1482 if (!lun_acl) { 1483 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1484 return; 1485 } 1486 1487 target_undepend_item(&lun_acl->se_lun_group.cg_item); 1488 kref_put(&se_deve->pr_kref, target_pr_kref_release); 1489 } 1490 1491 static sense_reason_t 1492 core_scsi3_decode_spec_i_port( 1493 struct se_cmd *cmd, 1494 struct se_portal_group *tpg, 1495 unsigned char *l_isid, 1496 u64 sa_res_key, 1497 int all_tg_pt, 1498 int aptpl) 1499 { 1500 struct se_device *dev = cmd->se_dev; 1501 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1502 struct se_session *se_sess = cmd->se_sess; 1503 struct se_node_acl *dest_node_acl = NULL; 1504 struct se_dev_entry *dest_se_deve = NULL; 1505 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1506 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1507 LIST_HEAD(tid_dest_list); 1508 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1509 unsigned char *buf, *ptr, proto_ident; 1510 const unsigned char *i_str = NULL; 1511 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1512 sense_reason_t ret; 1513 u32 tpdl, tid_len = 0; 1514 u32 dest_rtpi = 0; 1515 1516 /* 1517 * Allocate a struct pr_transport_id_holder and setup the 1518 * local_node_acl pointer and add to struct list_head tid_dest_list 1519 * for add registration processing in the loop of tid_dest_list below. 1520 */ 1521 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1522 if (!tidh_new) { 1523 pr_err("Unable to allocate tidh_new\n"); 1524 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1525 } 1526 INIT_LIST_HEAD(&tidh_new->dest_list); 1527 tidh_new->dest_tpg = tpg; 1528 tidh_new->dest_node_acl = se_sess->se_node_acl; 1529 1530 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1531 se_sess->se_node_acl, cmd->se_lun, 1532 NULL, cmd->orig_fe_lun, l_isid, 1533 sa_res_key, all_tg_pt, aptpl); 1534 if (!local_pr_reg) { 1535 kfree(tidh_new); 1536 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1537 } 1538 tidh_new->dest_pr_reg = local_pr_reg; 1539 /* 1540 * The local I_T nexus does not hold any configfs dependances, 1541 * so we set tidh_new->dest_se_deve to NULL to prevent the 1542 * configfs_undepend_item() calls in the tid_dest_list loops below. 1543 */ 1544 tidh_new->dest_se_deve = NULL; 1545 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1546 1547 if (cmd->data_length < 28) { 1548 pr_warn("SPC-PR: Received PR OUT parameter list" 1549 " length too small: %u\n", cmd->data_length); 1550 ret = TCM_INVALID_PARAMETER_LIST; 1551 goto out; 1552 } 1553 1554 buf = transport_kmap_data_sg(cmd); 1555 if (!buf) { 1556 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1557 goto out; 1558 } 1559 1560 /* 1561 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1562 * first extract TransportID Parameter Data Length, and make sure 1563 * the value matches up to the SCSI expected data transfer length. 1564 */ 1565 tpdl = (buf[24] & 0xff) << 24; 1566 tpdl |= (buf[25] & 0xff) << 16; 1567 tpdl |= (buf[26] & 0xff) << 8; 1568 tpdl |= buf[27] & 0xff; 1569 1570 if ((tpdl + 28) != cmd->data_length) { 1571 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1572 " does not equal CDB data_length: %u\n", tpdl, 1573 cmd->data_length); 1574 ret = TCM_INVALID_PARAMETER_LIST; 1575 goto out_unmap; 1576 } 1577 /* 1578 * Start processing the received transport IDs using the 1579 * receiving I_T Nexus portal's fabric dependent methods to 1580 * obtain the SCSI Initiator Port/Device Identifiers. 1581 */ 1582 ptr = &buf[28]; 1583 1584 while (tpdl > 0) { 1585 struct se_lun *dest_lun, *tmp_lun; 1586 1587 proto_ident = (ptr[0] & 0x0f); 1588 dest_tpg = NULL; 1589 1590 spin_lock(&dev->se_port_lock); 1591 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1592 tmp_tpg = tmp_lun->lun_tpg; 1593 1594 /* 1595 * Look for the matching proto_ident provided by 1596 * the received TransportID 1597 */ 1598 if (tmp_tpg->proto_id != proto_ident) 1599 continue; 1600 dest_rtpi = tmp_lun->lun_rtpi; 1601 1602 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1603 (const char *)ptr, &tid_len, &iport_ptr); 1604 if (!i_str) 1605 continue; 1606 1607 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1608 spin_unlock(&dev->se_port_lock); 1609 1610 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1611 pr_err(" core_scsi3_tpg_depend_item()" 1612 " for tmp_tpg\n"); 1613 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1614 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1615 goto out_unmap; 1616 } 1617 /* 1618 * Locate the destination initiator ACL to be registered 1619 * from the decoded fabric module specific TransportID 1620 * at *i_str. 1621 */ 1622 mutex_lock(&tmp_tpg->acl_node_mutex); 1623 dest_node_acl = __core_tpg_get_initiator_node_acl( 1624 tmp_tpg, i_str); 1625 if (dest_node_acl) 1626 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1627 mutex_unlock(&tmp_tpg->acl_node_mutex); 1628 1629 if (!dest_node_acl) { 1630 core_scsi3_tpg_undepend_item(tmp_tpg); 1631 spin_lock(&dev->se_port_lock); 1632 continue; 1633 } 1634 1635 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1636 pr_err("configfs_depend_item() failed" 1637 " for dest_node_acl->acl_group\n"); 1638 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1639 core_scsi3_tpg_undepend_item(tmp_tpg); 1640 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1641 goto out_unmap; 1642 } 1643 1644 dest_tpg = tmp_tpg; 1645 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1646 " %s Port RTPI: %hu\n", 1647 dest_tpg->se_tpg_tfo->get_fabric_name(), 1648 dest_node_acl->initiatorname, dest_rtpi); 1649 1650 spin_lock(&dev->se_port_lock); 1651 break; 1652 } 1653 spin_unlock(&dev->se_port_lock); 1654 1655 if (!dest_tpg) { 1656 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1657 " dest_tpg\n"); 1658 ret = TCM_INVALID_PARAMETER_LIST; 1659 goto out_unmap; 1660 } 1661 1662 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1663 " tid_len: %d for %s + %s\n", 1664 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1665 tpdl, tid_len, i_str, iport_ptr); 1666 1667 if (tid_len > tpdl) { 1668 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1669 " %u for Transport ID: %s\n", tid_len, ptr); 1670 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1671 core_scsi3_tpg_undepend_item(dest_tpg); 1672 ret = TCM_INVALID_PARAMETER_LIST; 1673 goto out_unmap; 1674 } 1675 /* 1676 * Locate the desintation struct se_dev_entry pointer for matching 1677 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1678 * Target Port. 1679 */ 1680 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1681 dest_rtpi); 1682 if (!dest_se_deve) { 1683 pr_err("Unable to locate %s dest_se_deve" 1684 " from destination RTPI: %hu\n", 1685 dest_tpg->se_tpg_tfo->get_fabric_name(), 1686 dest_rtpi); 1687 1688 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1689 core_scsi3_tpg_undepend_item(dest_tpg); 1690 ret = TCM_INVALID_PARAMETER_LIST; 1691 goto out_unmap; 1692 } 1693 1694 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1695 pr_err("core_scsi3_lunacl_depend_item()" 1696 " failed\n"); 1697 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1698 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1699 core_scsi3_tpg_undepend_item(dest_tpg); 1700 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1701 goto out_unmap; 1702 } 1703 1704 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1705 " dest_se_deve mapped_lun: %llu\n", 1706 dest_tpg->se_tpg_tfo->get_fabric_name(), 1707 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1708 1709 /* 1710 * Skip any TransportIDs that already have a registration for 1711 * this target port. 1712 */ 1713 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1714 iport_ptr); 1715 if (pr_reg_e) { 1716 core_scsi3_put_pr_reg(pr_reg_e); 1717 core_scsi3_lunacl_undepend_item(dest_se_deve); 1718 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1719 core_scsi3_tpg_undepend_item(dest_tpg); 1720 ptr += tid_len; 1721 tpdl -= tid_len; 1722 tid_len = 0; 1723 continue; 1724 } 1725 /* 1726 * Allocate a struct pr_transport_id_holder and setup 1727 * the dest_node_acl and dest_se_deve pointers for the 1728 * loop below. 1729 */ 1730 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1731 GFP_KERNEL); 1732 if (!tidh_new) { 1733 pr_err("Unable to allocate tidh_new\n"); 1734 core_scsi3_lunacl_undepend_item(dest_se_deve); 1735 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1736 core_scsi3_tpg_undepend_item(dest_tpg); 1737 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1738 goto out_unmap; 1739 } 1740 INIT_LIST_HEAD(&tidh_new->dest_list); 1741 tidh_new->dest_tpg = dest_tpg; 1742 tidh_new->dest_node_acl = dest_node_acl; 1743 tidh_new->dest_se_deve = dest_se_deve; 1744 1745 /* 1746 * Allocate, but do NOT add the registration for the 1747 * TransportID referenced SCSI Initiator port. This 1748 * done because of the following from spc4r17 in section 1749 * 6.14.3 wrt SPEC_I_PT: 1750 * 1751 * "If a registration fails for any initiator port (e.g., if th 1752 * logical unit does not have enough resources available to 1753 * hold the registration information), no registrations shall be 1754 * made, and the command shall be terminated with 1755 * CHECK CONDITION status." 1756 * 1757 * That means we call __core_scsi3_alloc_registration() here, 1758 * and then call __core_scsi3_add_registration() in the 1759 * 2nd loop which will never fail. 1760 */ 1761 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1762 kref_read(&dest_se_deve->pr_kref) != 0); 1763 1764 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1765 dest_node_acl, dest_lun, dest_se_deve, 1766 dest_se_deve->mapped_lun, iport_ptr, 1767 sa_res_key, all_tg_pt, aptpl); 1768 if (!dest_pr_reg) { 1769 core_scsi3_lunacl_undepend_item(dest_se_deve); 1770 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1771 core_scsi3_tpg_undepend_item(dest_tpg); 1772 kfree(tidh_new); 1773 ret = TCM_INVALID_PARAMETER_LIST; 1774 goto out_unmap; 1775 } 1776 tidh_new->dest_pr_reg = dest_pr_reg; 1777 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1778 1779 ptr += tid_len; 1780 tpdl -= tid_len; 1781 tid_len = 0; 1782 1783 } 1784 1785 transport_kunmap_data_sg(cmd); 1786 1787 /* 1788 * Go ahead and create a registrations from tid_dest_list for the 1789 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1790 * and dest_se_deve. 1791 * 1792 * The SA Reservation Key from the PROUT is set for the 1793 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1794 * means that the TransportID Initiator port will be 1795 * registered on all of the target ports in the SCSI target device 1796 * ALL_TG_PT=0 means the registration will only be for the 1797 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1798 * was received. 1799 */ 1800 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1801 dest_tpg = tidh->dest_tpg; 1802 dest_node_acl = tidh->dest_node_acl; 1803 dest_se_deve = tidh->dest_se_deve; 1804 dest_pr_reg = tidh->dest_pr_reg; 1805 1806 list_del(&tidh->dest_list); 1807 kfree(tidh); 1808 1809 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1810 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1811 1812 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1813 dest_pr_reg, 0, 0); 1814 1815 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1816 " registered Transport ID for Node: %s%s Mapped LUN:" 1817 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1818 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1819 dest_se_deve->mapped_lun : 0); 1820 1821 if (!dest_se_deve) { 1822 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1823 target_pr_kref_release); 1824 continue; 1825 } 1826 core_scsi3_lunacl_undepend_item(dest_se_deve); 1827 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1828 core_scsi3_tpg_undepend_item(dest_tpg); 1829 } 1830 1831 return 0; 1832 out_unmap: 1833 transport_kunmap_data_sg(cmd); 1834 out: 1835 /* 1836 * For the failure case, release everything from tid_dest_list 1837 * including *dest_pr_reg and the configfs dependances.. 1838 */ 1839 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1840 dest_tpg = tidh->dest_tpg; 1841 dest_node_acl = tidh->dest_node_acl; 1842 dest_se_deve = tidh->dest_se_deve; 1843 dest_pr_reg = tidh->dest_pr_reg; 1844 1845 list_del(&tidh->dest_list); 1846 kfree(tidh); 1847 /* 1848 * Release any extra ALL_TG_PT=1 registrations for 1849 * the SPEC_I_PT=1 case. 1850 */ 1851 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1852 &dest_pr_reg->pr_reg_atp_list, 1853 pr_reg_atp_mem_list) { 1854 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1855 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1856 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1857 } 1858 1859 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1860 1861 if (!dest_se_deve) { 1862 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1863 target_pr_kref_release); 1864 continue; 1865 } 1866 core_scsi3_lunacl_undepend_item(dest_se_deve); 1867 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1868 core_scsi3_tpg_undepend_item(dest_tpg); 1869 } 1870 return ret; 1871 } 1872 1873 static int core_scsi3_update_aptpl_buf( 1874 struct se_device *dev, 1875 unsigned char *buf, 1876 u32 pr_aptpl_buf_len) 1877 { 1878 struct se_portal_group *tpg; 1879 struct t10_pr_registration *pr_reg; 1880 unsigned char tmp[512], isid_buf[32]; 1881 ssize_t len = 0; 1882 int reg_count = 0; 1883 int ret = 0; 1884 1885 spin_lock(&dev->dev_reservation_lock); 1886 spin_lock(&dev->t10_pr.registration_lock); 1887 /* 1888 * Walk the registration list.. 1889 */ 1890 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1891 pr_reg_list) { 1892 1893 tmp[0] = '\0'; 1894 isid_buf[0] = '\0'; 1895 tpg = pr_reg->pr_reg_nacl->se_tpg; 1896 /* 1897 * Write out any ISID value to APTPL metadata that was included 1898 * in the original registration. 1899 */ 1900 if (pr_reg->isid_present_at_reg) 1901 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1902 pr_reg->pr_reg_isid); 1903 /* 1904 * Include special metadata if the pr_reg matches the 1905 * reservation holder. 1906 */ 1907 if (dev->dev_pr_res_holder == pr_reg) { 1908 snprintf(tmp, 512, "PR_REG_START: %d" 1909 "\ninitiator_fabric=%s\n" 1910 "initiator_node=%s\n%s" 1911 "sa_res_key=%llu\n" 1912 "res_holder=1\nres_type=%02x\n" 1913 "res_scope=%02x\nres_all_tg_pt=%d\n" 1914 "mapped_lun=%llu\n", reg_count, 1915 tpg->se_tpg_tfo->get_fabric_name(), 1916 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1917 pr_reg->pr_res_key, pr_reg->pr_res_type, 1918 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1919 pr_reg->pr_res_mapped_lun); 1920 } else { 1921 snprintf(tmp, 512, "PR_REG_START: %d\n" 1922 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1923 "sa_res_key=%llu\nres_holder=0\n" 1924 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1925 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1926 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1927 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1928 pr_reg->pr_res_mapped_lun); 1929 } 1930 1931 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1932 pr_err("Unable to update renaming APTPL metadata," 1933 " reallocating larger buffer\n"); 1934 ret = -EMSGSIZE; 1935 goto out; 1936 } 1937 len += sprintf(buf+len, "%s", tmp); 1938 1939 /* 1940 * Include information about the associated SCSI target port. 1941 */ 1942 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1943 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1944 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1945 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1946 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1947 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1948 reg_count); 1949 1950 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1951 pr_err("Unable to update renaming APTPL metadata," 1952 " reallocating larger buffer\n"); 1953 ret = -EMSGSIZE; 1954 goto out; 1955 } 1956 len += sprintf(buf+len, "%s", tmp); 1957 reg_count++; 1958 } 1959 1960 if (!reg_count) 1961 len += sprintf(buf+len, "No Registrations or Reservations"); 1962 1963 out: 1964 spin_unlock(&dev->t10_pr.registration_lock); 1965 spin_unlock(&dev->dev_reservation_lock); 1966 1967 return ret; 1968 } 1969 1970 static int __core_scsi3_write_aptpl_to_file( 1971 struct se_device *dev, 1972 unsigned char *buf) 1973 { 1974 struct t10_wwn *wwn = &dev->t10_wwn; 1975 struct file *file; 1976 int flags = O_RDWR | O_CREAT | O_TRUNC; 1977 char path[512]; 1978 u32 pr_aptpl_buf_len; 1979 int ret; 1980 1981 memset(path, 0, 512); 1982 1983 if (strlen(&wwn->unit_serial[0]) >= 512) { 1984 pr_err("WWN value for struct se_device does not fit" 1985 " into path buffer\n"); 1986 return -EMSGSIZE; 1987 } 1988 1989 snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); 1990 file = filp_open(path, flags, 0600); 1991 if (IS_ERR(file)) { 1992 pr_err("filp_open(%s) for APTPL metadata" 1993 " failed\n", path); 1994 return PTR_ERR(file); 1995 } 1996 1997 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1998 1999 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 2000 2001 if (ret < 0) 2002 pr_debug("Error writing APTPL metadata file: %s\n", path); 2003 fput(file); 2004 2005 return (ret < 0) ? -EIO : 0; 2006 } 2007 2008 /* 2009 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2010 * write out the updated metadata to struct file for this SCSI device. 2011 */ 2012 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2013 { 2014 unsigned char *buf; 2015 int rc, len = PR_APTPL_BUF_LEN; 2016 2017 if (!aptpl) { 2018 char *null_buf = "No Registrations or Reservations\n"; 2019 2020 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2021 dev->t10_pr.pr_aptpl_active = 0; 2022 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2023 2024 if (rc) 2025 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2026 2027 return 0; 2028 } 2029 retry: 2030 buf = vzalloc(len); 2031 if (!buf) 2032 return TCM_OUT_OF_RESOURCES; 2033 2034 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2035 if (rc < 0) { 2036 vfree(buf); 2037 len *= 2; 2038 goto retry; 2039 } 2040 2041 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2042 if (rc != 0) { 2043 pr_err("SPC-3 PR: Could not update APTPL\n"); 2044 vfree(buf); 2045 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2046 } 2047 dev->t10_pr.pr_aptpl_active = 1; 2048 vfree(buf); 2049 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2050 return 0; 2051 } 2052 2053 static sense_reason_t 2054 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2055 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2056 { 2057 struct se_session *se_sess = cmd->se_sess; 2058 struct se_device *dev = cmd->se_dev; 2059 struct se_lun *se_lun = cmd->se_lun; 2060 struct se_portal_group *se_tpg; 2061 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2062 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2063 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2064 sense_reason_t ret = TCM_NO_SENSE; 2065 int pr_holder = 0, type; 2066 2067 if (!se_sess || !se_lun) { 2068 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2069 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2070 } 2071 se_tpg = se_sess->se_tpg; 2072 2073 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2074 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2075 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2076 PR_REG_ISID_LEN); 2077 isid_ptr = &isid_buf[0]; 2078 } 2079 /* 2080 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2081 */ 2082 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2083 if (!pr_reg) { 2084 if (res_key) { 2085 pr_warn("SPC-3 PR: Reservation Key non-zero" 2086 " for SA REGISTER, returning CONFLICT\n"); 2087 return TCM_RESERVATION_CONFLICT; 2088 } 2089 /* 2090 * Do nothing but return GOOD status. 2091 */ 2092 if (!sa_res_key) 2093 return 0; 2094 2095 if (!spec_i_pt) { 2096 /* 2097 * Perform the Service Action REGISTER on the Initiator 2098 * Port Endpoint that the PRO was received from on the 2099 * Logical Unit of the SCSI device server. 2100 */ 2101 if (core_scsi3_alloc_registration(cmd->se_dev, 2102 se_sess->se_node_acl, cmd->se_lun, 2103 NULL, cmd->orig_fe_lun, isid_ptr, 2104 sa_res_key, all_tg_pt, aptpl, 2105 register_type, 0)) { 2106 pr_err("Unable to allocate" 2107 " struct t10_pr_registration\n"); 2108 return TCM_INVALID_PARAMETER_LIST; 2109 } 2110 } else { 2111 /* 2112 * Register both the Initiator port that received 2113 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2114 * TransportID from Parameter list and loop through 2115 * fabric dependent parameter list while calling 2116 * logic from of core_scsi3_alloc_registration() for 2117 * each TransportID provided SCSI Initiator Port/Device 2118 */ 2119 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2120 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2121 if (ret != 0) 2122 return ret; 2123 } 2124 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2125 } 2126 2127 /* ok, existing registration */ 2128 2129 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2130 pr_err("SPC-3 PR REGISTER: Received" 2131 " res_key: 0x%016Lx does not match" 2132 " existing SA REGISTER res_key:" 2133 " 0x%016Lx\n", res_key, 2134 pr_reg->pr_res_key); 2135 ret = TCM_RESERVATION_CONFLICT; 2136 goto out; 2137 } 2138 2139 if (spec_i_pt) { 2140 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2141 " set on a registered nexus\n"); 2142 ret = TCM_INVALID_PARAMETER_LIST; 2143 goto out; 2144 } 2145 2146 /* 2147 * An existing ALL_TG_PT=1 registration being released 2148 * must also set ALL_TG_PT=1 in the incoming PROUT. 2149 */ 2150 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2151 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2152 " registration exists, but ALL_TG_PT=1 bit not" 2153 " present in received PROUT\n"); 2154 ret = TCM_INVALID_CDB_FIELD; 2155 goto out; 2156 } 2157 2158 /* 2159 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2160 */ 2161 if (sa_res_key) { 2162 /* 2163 * Increment PRgeneration counter for struct se_device" 2164 * upon a successful REGISTER, see spc4r17 section 6.3.2 2165 * READ_KEYS service action. 2166 */ 2167 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2168 pr_reg->pr_res_key = sa_res_key; 2169 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2170 " Key for %s to: 0x%016Lx PRgeneration:" 2171 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2172 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2173 pr_reg->pr_reg_nacl->initiatorname, 2174 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2175 2176 } else { 2177 /* 2178 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2179 */ 2180 type = pr_reg->pr_res_type; 2181 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2182 pr_reg); 2183 if (pr_holder < 0) { 2184 ret = TCM_RESERVATION_CONFLICT; 2185 goto out; 2186 } 2187 2188 spin_lock(&pr_tmpl->registration_lock); 2189 /* 2190 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2191 * and matching pr_res_key. 2192 */ 2193 if (pr_reg->pr_reg_all_tg_pt) { 2194 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2195 &pr_tmpl->registration_list, 2196 pr_reg_list) { 2197 2198 if (!pr_reg_p->pr_reg_all_tg_pt) 2199 continue; 2200 if (pr_reg_p->pr_res_key != res_key) 2201 continue; 2202 if (pr_reg == pr_reg_p) 2203 continue; 2204 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2205 pr_reg_p->pr_reg_nacl->initiatorname)) 2206 continue; 2207 2208 __core_scsi3_free_registration(dev, 2209 pr_reg_p, NULL, 0); 2210 } 2211 } 2212 2213 /* 2214 * Release the calling I_T Nexus registration now.. 2215 */ 2216 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2217 pr_reg = NULL; 2218 2219 /* 2220 * From spc4r17, section 5.7.11.3 Unregistering 2221 * 2222 * If the persistent reservation is a registrants only 2223 * type, the device server shall establish a unit 2224 * attention condition for the initiator port associated 2225 * with every registered I_T nexus except for the I_T 2226 * nexus on which the PERSISTENT RESERVE OUT command was 2227 * received, with the additional sense code set to 2228 * RESERVATIONS RELEASED. 2229 */ 2230 if (pr_holder && 2231 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2232 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2233 list_for_each_entry(pr_reg_p, 2234 &pr_tmpl->registration_list, 2235 pr_reg_list) { 2236 2237 target_ua_allocate_lun( 2238 pr_reg_p->pr_reg_nacl, 2239 pr_reg_p->pr_res_mapped_lun, 2240 0x2A, 2241 ASCQ_2AH_RESERVATIONS_RELEASED); 2242 } 2243 } 2244 2245 spin_unlock(&pr_tmpl->registration_lock); 2246 } 2247 2248 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2249 2250 out: 2251 if (pr_reg) 2252 core_scsi3_put_pr_reg(pr_reg); 2253 return ret; 2254 } 2255 2256 unsigned char *core_scsi3_pr_dump_type(int type) 2257 { 2258 switch (type) { 2259 case PR_TYPE_WRITE_EXCLUSIVE: 2260 return "Write Exclusive Access"; 2261 case PR_TYPE_EXCLUSIVE_ACCESS: 2262 return "Exclusive Access"; 2263 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2264 return "Write Exclusive Access, Registrants Only"; 2265 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2266 return "Exclusive Access, Registrants Only"; 2267 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2268 return "Write Exclusive Access, All Registrants"; 2269 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2270 return "Exclusive Access, All Registrants"; 2271 default: 2272 break; 2273 } 2274 2275 return "Unknown SPC-3 PR Type"; 2276 } 2277 2278 static sense_reason_t 2279 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2280 { 2281 struct se_device *dev = cmd->se_dev; 2282 struct se_session *se_sess = cmd->se_sess; 2283 struct se_lun *se_lun = cmd->se_lun; 2284 struct t10_pr_registration *pr_reg, *pr_res_holder; 2285 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2286 char i_buf[PR_REG_ISID_ID_LEN]; 2287 sense_reason_t ret; 2288 2289 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2290 2291 if (!se_sess || !se_lun) { 2292 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2293 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2294 } 2295 /* 2296 * Locate the existing *pr_reg via struct se_node_acl pointers 2297 */ 2298 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2299 se_sess); 2300 if (!pr_reg) { 2301 pr_err("SPC-3 PR: Unable to locate" 2302 " PR_REGISTERED *pr_reg for RESERVE\n"); 2303 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2304 } 2305 /* 2306 * From spc4r17 Section 5.7.9: Reserving: 2307 * 2308 * An application client creates a persistent reservation by issuing 2309 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2310 * a registered I_T nexus with the following parameters: 2311 * a) RESERVATION KEY set to the value of the reservation key that is 2312 * registered with the logical unit for the I_T nexus; and 2313 */ 2314 if (res_key != pr_reg->pr_res_key) { 2315 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2316 " does not match existing SA REGISTER res_key:" 2317 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2318 ret = TCM_RESERVATION_CONFLICT; 2319 goto out_put_pr_reg; 2320 } 2321 /* 2322 * From spc4r17 Section 5.7.9: Reserving: 2323 * 2324 * From above: 2325 * b) TYPE field and SCOPE field set to the persistent reservation 2326 * being created. 2327 * 2328 * Only one persistent reservation is allowed at a time per logical unit 2329 * and that persistent reservation has a scope of LU_SCOPE. 2330 */ 2331 if (scope != PR_SCOPE_LU_SCOPE) { 2332 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2333 ret = TCM_INVALID_PARAMETER_LIST; 2334 goto out_put_pr_reg; 2335 } 2336 /* 2337 * See if we have an existing PR reservation holder pointer at 2338 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2339 * *pr_res_holder. 2340 */ 2341 spin_lock(&dev->dev_reservation_lock); 2342 pr_res_holder = dev->dev_pr_res_holder; 2343 if (pr_res_holder) { 2344 /* 2345 * From spc4r17 Section 5.7.9: Reserving: 2346 * 2347 * If the device server receives a PERSISTENT RESERVE OUT 2348 * command from an I_T nexus other than a persistent reservation 2349 * holder (see 5.7.10) that attempts to create a persistent 2350 * reservation when a persistent reservation already exists for 2351 * the logical unit, then the command shall be completed with 2352 * RESERVATION CONFLICT status. 2353 */ 2354 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2355 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2356 pr_err("SPC-3 PR: Attempted RESERVE from" 2357 " [%s]: %s while reservation already held by" 2358 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2359 cmd->se_tfo->get_fabric_name(), 2360 se_sess->se_node_acl->initiatorname, 2361 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2362 pr_res_holder->pr_reg_nacl->initiatorname); 2363 2364 spin_unlock(&dev->dev_reservation_lock); 2365 ret = TCM_RESERVATION_CONFLICT; 2366 goto out_put_pr_reg; 2367 } 2368 /* 2369 * From spc4r17 Section 5.7.9: Reserving: 2370 * 2371 * If a persistent reservation holder attempts to modify the 2372 * type or scope of an existing persistent reservation, the 2373 * command shall be completed with RESERVATION CONFLICT status. 2374 */ 2375 if ((pr_res_holder->pr_res_type != type) || 2376 (pr_res_holder->pr_res_scope != scope)) { 2377 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2378 pr_err("SPC-3 PR: Attempted RESERVE from" 2379 " [%s]: %s trying to change TYPE and/or SCOPE," 2380 " while reservation already held by [%s]: %s," 2381 " returning RESERVATION_CONFLICT\n", 2382 cmd->se_tfo->get_fabric_name(), 2383 se_sess->se_node_acl->initiatorname, 2384 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2385 pr_res_holder->pr_reg_nacl->initiatorname); 2386 2387 spin_unlock(&dev->dev_reservation_lock); 2388 ret = TCM_RESERVATION_CONFLICT; 2389 goto out_put_pr_reg; 2390 } 2391 /* 2392 * From spc4r17 Section 5.7.9: Reserving: 2393 * 2394 * If the device server receives a PERSISTENT RESERVE OUT 2395 * command with RESERVE service action where the TYPE field and 2396 * the SCOPE field contain the same values as the existing type 2397 * and scope from a persistent reservation holder, it shall not 2398 * make any change to the existing persistent reservation and 2399 * shall completethe command with GOOD status. 2400 */ 2401 spin_unlock(&dev->dev_reservation_lock); 2402 ret = 0; 2403 goto out_put_pr_reg; 2404 } 2405 /* 2406 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2407 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2408 */ 2409 pr_reg->pr_res_scope = scope; 2410 pr_reg->pr_res_type = type; 2411 pr_reg->pr_res_holder = 1; 2412 dev->dev_pr_res_holder = pr_reg; 2413 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2414 2415 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2416 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2417 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2418 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2419 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2420 cmd->se_tfo->get_fabric_name(), 2421 se_sess->se_node_acl->initiatorname, 2422 i_buf); 2423 spin_unlock(&dev->dev_reservation_lock); 2424 2425 if (pr_tmpl->pr_aptpl_active) 2426 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2427 2428 ret = 0; 2429 out_put_pr_reg: 2430 core_scsi3_put_pr_reg(pr_reg); 2431 return ret; 2432 } 2433 2434 static sense_reason_t 2435 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2436 u64 res_key) 2437 { 2438 switch (type) { 2439 case PR_TYPE_WRITE_EXCLUSIVE: 2440 case PR_TYPE_EXCLUSIVE_ACCESS: 2441 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2442 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2443 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2444 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2445 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2446 default: 2447 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2448 " 0x%02x\n", type); 2449 return TCM_INVALID_CDB_FIELD; 2450 } 2451 } 2452 2453 /* 2454 * Called with struct se_device->dev_reservation_lock held. 2455 */ 2456 static void __core_scsi3_complete_pro_release( 2457 struct se_device *dev, 2458 struct se_node_acl *se_nacl, 2459 struct t10_pr_registration *pr_reg, 2460 int explicit, 2461 int unreg) 2462 { 2463 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2464 char i_buf[PR_REG_ISID_ID_LEN]; 2465 int pr_res_type = 0, pr_res_scope = 0; 2466 2467 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2468 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2469 /* 2470 * Go ahead and release the current PR reservation holder. 2471 * If an All Registrants reservation is currently active and 2472 * a unregister operation is requested, replace the current 2473 * dev_pr_res_holder with another active registration. 2474 */ 2475 if (dev->dev_pr_res_holder) { 2476 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2477 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2478 dev->dev_pr_res_holder->pr_res_type = 0; 2479 dev->dev_pr_res_holder->pr_res_scope = 0; 2480 dev->dev_pr_res_holder->pr_res_holder = 0; 2481 dev->dev_pr_res_holder = NULL; 2482 } 2483 if (!unreg) 2484 goto out; 2485 2486 spin_lock(&dev->t10_pr.registration_lock); 2487 list_del_init(&pr_reg->pr_reg_list); 2488 /* 2489 * If the I_T nexus is a reservation holder, the persistent reservation 2490 * is of an all registrants type, and the I_T nexus is the last remaining 2491 * registered I_T nexus, then the device server shall also release the 2492 * persistent reservation. 2493 */ 2494 if (!list_empty(&dev->t10_pr.registration_list) && 2495 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2496 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2497 dev->dev_pr_res_holder = 2498 list_entry(dev->t10_pr.registration_list.next, 2499 struct t10_pr_registration, pr_reg_list); 2500 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2501 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2502 dev->dev_pr_res_holder->pr_res_holder = 1; 2503 } 2504 spin_unlock(&dev->t10_pr.registration_lock); 2505 out: 2506 if (!dev->dev_pr_res_holder) { 2507 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2508 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2509 tfo->get_fabric_name(), (explicit) ? "explicit" : 2510 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2511 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2512 } 2513 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2514 tfo->get_fabric_name(), se_nacl->initiatorname, 2515 i_buf); 2516 /* 2517 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2518 */ 2519 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2520 } 2521 2522 static sense_reason_t 2523 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2524 u64 res_key) 2525 { 2526 struct se_device *dev = cmd->se_dev; 2527 struct se_session *se_sess = cmd->se_sess; 2528 struct se_lun *se_lun = cmd->se_lun; 2529 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2530 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2531 sense_reason_t ret = 0; 2532 2533 if (!se_sess || !se_lun) { 2534 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2535 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2536 } 2537 /* 2538 * Locate the existing *pr_reg via struct se_node_acl pointers 2539 */ 2540 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2541 if (!pr_reg) { 2542 pr_err("SPC-3 PR: Unable to locate" 2543 " PR_REGISTERED *pr_reg for RELEASE\n"); 2544 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2545 } 2546 /* 2547 * From spc4r17 Section 5.7.11.2 Releasing: 2548 * 2549 * If there is no persistent reservation or in response to a persistent 2550 * reservation release request from a registered I_T nexus that is not a 2551 * persistent reservation holder (see 5.7.10), the device server shall 2552 * do the following: 2553 * 2554 * a) Not release the persistent reservation, if any; 2555 * b) Not remove any registrations; and 2556 * c) Complete the command with GOOD status. 2557 */ 2558 spin_lock(&dev->dev_reservation_lock); 2559 pr_res_holder = dev->dev_pr_res_holder; 2560 if (!pr_res_holder) { 2561 /* 2562 * No persistent reservation, return GOOD status. 2563 */ 2564 spin_unlock(&dev->dev_reservation_lock); 2565 goto out_put_pr_reg; 2566 } 2567 2568 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2569 /* 2570 * Release request from a registered I_T nexus that is not a 2571 * persistent reservation holder. return GOOD status. 2572 */ 2573 spin_unlock(&dev->dev_reservation_lock); 2574 goto out_put_pr_reg; 2575 } 2576 2577 /* 2578 * From spc4r17 Section 5.7.11.2 Releasing: 2579 * 2580 * Only the persistent reservation holder (see 5.7.10) is allowed to 2581 * release a persistent reservation. 2582 * 2583 * An application client releases the persistent reservation by issuing 2584 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2585 * an I_T nexus that is a persistent reservation holder with the 2586 * following parameters: 2587 * 2588 * a) RESERVATION KEY field set to the value of the reservation key 2589 * that is registered with the logical unit for the I_T nexus; 2590 */ 2591 if (res_key != pr_reg->pr_res_key) { 2592 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2593 " does not match existing SA REGISTER res_key:" 2594 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2595 spin_unlock(&dev->dev_reservation_lock); 2596 ret = TCM_RESERVATION_CONFLICT; 2597 goto out_put_pr_reg; 2598 } 2599 /* 2600 * From spc4r17 Section 5.7.11.2 Releasing and above: 2601 * 2602 * b) TYPE field and SCOPE field set to match the persistent 2603 * reservation being released. 2604 */ 2605 if ((pr_res_holder->pr_res_type != type) || 2606 (pr_res_holder->pr_res_scope != scope)) { 2607 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2608 pr_err("SPC-3 PR RELEASE: Attempted to release" 2609 " reservation from [%s]: %s with different TYPE " 2610 "and/or SCOPE while reservation already held by" 2611 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2612 cmd->se_tfo->get_fabric_name(), 2613 se_sess->se_node_acl->initiatorname, 2614 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2615 pr_res_holder->pr_reg_nacl->initiatorname); 2616 2617 spin_unlock(&dev->dev_reservation_lock); 2618 ret = TCM_RESERVATION_CONFLICT; 2619 goto out_put_pr_reg; 2620 } 2621 /* 2622 * In response to a persistent reservation release request from the 2623 * persistent reservation holder the device server shall perform a 2624 * release by doing the following as an uninterrupted series of actions: 2625 * a) Release the persistent reservation; 2626 * b) Not remove any registration(s); 2627 * c) If the released persistent reservation is a registrants only type 2628 * or all registrants type persistent reservation, 2629 * the device server shall establish a unit attention condition for 2630 * the initiator port associated with every regis- 2631 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2632 * RESERVE OUT command with RELEASE service action was received, 2633 * with the additional sense code set to RESERVATIONS RELEASED; and 2634 * d) If the persistent reservation is of any other type, the device 2635 * server shall not establish a unit attention condition. 2636 */ 2637 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2638 pr_reg, 1, 0); 2639 2640 spin_unlock(&dev->dev_reservation_lock); 2641 2642 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2643 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2644 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2645 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2646 /* 2647 * If no UNIT ATTENTION conditions will be established for 2648 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2649 * go ahead and check for APTPL=1 update+write below 2650 */ 2651 goto write_aptpl; 2652 } 2653 2654 spin_lock(&pr_tmpl->registration_lock); 2655 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2656 pr_reg_list) { 2657 /* 2658 * Do not establish a UNIT ATTENTION condition 2659 * for the calling I_T Nexus 2660 */ 2661 if (pr_reg_p == pr_reg) 2662 continue; 2663 2664 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2665 pr_reg_p->pr_res_mapped_lun, 2666 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2667 } 2668 spin_unlock(&pr_tmpl->registration_lock); 2669 2670 write_aptpl: 2671 if (pr_tmpl->pr_aptpl_active) 2672 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2673 2674 out_put_pr_reg: 2675 core_scsi3_put_pr_reg(pr_reg); 2676 return ret; 2677 } 2678 2679 static sense_reason_t 2680 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2681 { 2682 struct se_device *dev = cmd->se_dev; 2683 struct se_node_acl *pr_reg_nacl; 2684 struct se_session *se_sess = cmd->se_sess; 2685 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2686 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2687 u64 pr_res_mapped_lun = 0; 2688 int calling_it_nexus = 0; 2689 /* 2690 * Locate the existing *pr_reg via struct se_node_acl pointers 2691 */ 2692 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2693 se_sess->se_node_acl, se_sess); 2694 if (!pr_reg_n) { 2695 pr_err("SPC-3 PR: Unable to locate" 2696 " PR_REGISTERED *pr_reg for CLEAR\n"); 2697 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2698 } 2699 /* 2700 * From spc4r17 section 5.7.11.6, Clearing: 2701 * 2702 * Any application client may release the persistent reservation and 2703 * remove all registrations from a device server by issuing a 2704 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2705 * registered I_T nexus with the following parameter: 2706 * 2707 * a) RESERVATION KEY field set to the value of the reservation key 2708 * that is registered with the logical unit for the I_T nexus. 2709 */ 2710 if (res_key != pr_reg_n->pr_res_key) { 2711 pr_err("SPC-3 PR REGISTER: Received" 2712 " res_key: 0x%016Lx does not match" 2713 " existing SA REGISTER res_key:" 2714 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2715 core_scsi3_put_pr_reg(pr_reg_n); 2716 return TCM_RESERVATION_CONFLICT; 2717 } 2718 /* 2719 * a) Release the persistent reservation, if any; 2720 */ 2721 spin_lock(&dev->dev_reservation_lock); 2722 pr_res_holder = dev->dev_pr_res_holder; 2723 if (pr_res_holder) { 2724 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2725 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2726 pr_res_holder, 0, 0); 2727 } 2728 spin_unlock(&dev->dev_reservation_lock); 2729 /* 2730 * b) Remove all registration(s) (see spc4r17 5.7.7); 2731 */ 2732 spin_lock(&pr_tmpl->registration_lock); 2733 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2734 &pr_tmpl->registration_list, pr_reg_list) { 2735 2736 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2737 pr_reg_nacl = pr_reg->pr_reg_nacl; 2738 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2739 __core_scsi3_free_registration(dev, pr_reg, NULL, 2740 calling_it_nexus); 2741 /* 2742 * e) Establish a unit attention condition for the initiator 2743 * port associated with every registered I_T nexus other 2744 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2745 * command with CLEAR service action was received, with the 2746 * additional sense code set to RESERVATIONS PREEMPTED. 2747 */ 2748 if (!calling_it_nexus) 2749 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2750 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2751 } 2752 spin_unlock(&pr_tmpl->registration_lock); 2753 2754 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2755 cmd->se_tfo->get_fabric_name()); 2756 2757 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2758 2759 core_scsi3_pr_generation(dev); 2760 return 0; 2761 } 2762 2763 /* 2764 * Called with struct se_device->dev_reservation_lock held. 2765 */ 2766 static void __core_scsi3_complete_pro_preempt( 2767 struct se_device *dev, 2768 struct t10_pr_registration *pr_reg, 2769 struct list_head *preempt_and_abort_list, 2770 int type, 2771 int scope, 2772 enum preempt_type preempt_type) 2773 { 2774 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2775 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2776 char i_buf[PR_REG_ISID_ID_LEN]; 2777 2778 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2779 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2780 /* 2781 * Do an implicit RELEASE of the existing reservation. 2782 */ 2783 if (dev->dev_pr_res_holder) 2784 __core_scsi3_complete_pro_release(dev, nacl, 2785 dev->dev_pr_res_holder, 0, 0); 2786 2787 dev->dev_pr_res_holder = pr_reg; 2788 pr_reg->pr_res_holder = 1; 2789 pr_reg->pr_res_type = type; 2790 pr_reg->pr_res_scope = scope; 2791 2792 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2793 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2794 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2795 core_scsi3_pr_dump_type(type), 2796 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2797 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2798 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2799 nacl->initiatorname, i_buf); 2800 /* 2801 * For PREEMPT_AND_ABORT, add the preempting reservation's 2802 * struct t10_pr_registration to the list that will be compared 2803 * against received CDBs.. 2804 */ 2805 if (preempt_and_abort_list) 2806 list_add_tail(&pr_reg->pr_reg_abort_list, 2807 preempt_and_abort_list); 2808 } 2809 2810 static void core_scsi3_release_preempt_and_abort( 2811 struct list_head *preempt_and_abort_list, 2812 struct t10_pr_registration *pr_reg_holder) 2813 { 2814 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2815 2816 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2817 pr_reg_abort_list) { 2818 2819 list_del(&pr_reg->pr_reg_abort_list); 2820 if (pr_reg_holder == pr_reg) 2821 continue; 2822 if (pr_reg->pr_res_holder) { 2823 pr_warn("pr_reg->pr_res_holder still set\n"); 2824 continue; 2825 } 2826 2827 pr_reg->pr_reg_deve = NULL; 2828 pr_reg->pr_reg_nacl = NULL; 2829 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2830 } 2831 } 2832 2833 static sense_reason_t 2834 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2835 u64 sa_res_key, enum preempt_type preempt_type) 2836 { 2837 struct se_device *dev = cmd->se_dev; 2838 struct se_node_acl *pr_reg_nacl; 2839 struct se_session *se_sess = cmd->se_sess; 2840 LIST_HEAD(preempt_and_abort_list); 2841 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2842 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2843 u64 pr_res_mapped_lun = 0; 2844 int all_reg = 0, calling_it_nexus = 0; 2845 bool sa_res_key_unmatched = sa_res_key != 0; 2846 int prh_type = 0, prh_scope = 0; 2847 2848 if (!se_sess) 2849 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2850 2851 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2852 se_sess); 2853 if (!pr_reg_n) { 2854 pr_err("SPC-3 PR: Unable to locate" 2855 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2856 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2857 return TCM_RESERVATION_CONFLICT; 2858 } 2859 if (pr_reg_n->pr_res_key != res_key) { 2860 core_scsi3_put_pr_reg(pr_reg_n); 2861 return TCM_RESERVATION_CONFLICT; 2862 } 2863 if (scope != PR_SCOPE_LU_SCOPE) { 2864 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2865 core_scsi3_put_pr_reg(pr_reg_n); 2866 return TCM_INVALID_PARAMETER_LIST; 2867 } 2868 2869 spin_lock(&dev->dev_reservation_lock); 2870 pr_res_holder = dev->dev_pr_res_holder; 2871 if (pr_res_holder && 2872 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2873 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2874 all_reg = 1; 2875 2876 if (!all_reg && !sa_res_key) { 2877 spin_unlock(&dev->dev_reservation_lock); 2878 core_scsi3_put_pr_reg(pr_reg_n); 2879 return TCM_INVALID_PARAMETER_LIST; 2880 } 2881 /* 2882 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2883 * 2884 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2885 * persistent reservation holder or there is no persistent reservation 2886 * holder (i.e., there is no persistent reservation), then the device 2887 * server shall perform a preempt by doing the following in an 2888 * uninterrupted series of actions. (See below..) 2889 */ 2890 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2891 /* 2892 * No existing or SA Reservation Key matching reservations.. 2893 * 2894 * PROUT SA PREEMPT with All Registrant type reservations are 2895 * allowed to be processed without a matching SA Reservation Key 2896 */ 2897 spin_lock(&pr_tmpl->registration_lock); 2898 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2899 &pr_tmpl->registration_list, pr_reg_list) { 2900 /* 2901 * Removing of registrations in non all registrants 2902 * type reservations without a matching SA reservation 2903 * key. 2904 * 2905 * a) Remove the registrations for all I_T nexuses 2906 * specified by the SERVICE ACTION RESERVATION KEY 2907 * field; 2908 * b) Ignore the contents of the SCOPE and TYPE fields; 2909 * c) Process tasks as defined in 5.7.1; and 2910 * d) Establish a unit attention condition for the 2911 * initiator port associated with every I_T nexus 2912 * that lost its registration other than the I_T 2913 * nexus on which the PERSISTENT RESERVE OUT command 2914 * was received, with the additional sense code set 2915 * to REGISTRATIONS PREEMPTED. 2916 */ 2917 if (!all_reg) { 2918 if (pr_reg->pr_res_key != sa_res_key) 2919 continue; 2920 sa_res_key_unmatched = false; 2921 2922 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2923 pr_reg_nacl = pr_reg->pr_reg_nacl; 2924 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2925 __core_scsi3_free_registration(dev, pr_reg, 2926 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2927 NULL, calling_it_nexus); 2928 } else { 2929 /* 2930 * Case for any existing all registrants type 2931 * reservation, follow logic in spc4r17 section 2932 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2933 * 2934 * For a ZERO SA Reservation key, release 2935 * all other registrations and do an implicit 2936 * release of active persistent reservation. 2937 * 2938 * For a non-ZERO SA Reservation key, only 2939 * release the matching reservation key from 2940 * registrations. 2941 */ 2942 if ((sa_res_key) && 2943 (pr_reg->pr_res_key != sa_res_key)) 2944 continue; 2945 sa_res_key_unmatched = false; 2946 2947 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2948 if (calling_it_nexus) 2949 continue; 2950 2951 pr_reg_nacl = pr_reg->pr_reg_nacl; 2952 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2953 __core_scsi3_free_registration(dev, pr_reg, 2954 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2955 NULL, 0); 2956 } 2957 if (!calling_it_nexus) 2958 target_ua_allocate_lun(pr_reg_nacl, 2959 pr_res_mapped_lun, 0x2A, 2960 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2961 } 2962 spin_unlock(&pr_tmpl->registration_lock); 2963 /* 2964 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2965 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2966 * RESERVATION KEY field to a value that does not match any 2967 * registered reservation key, then the device server shall 2968 * complete the command with RESERVATION CONFLICT status. 2969 */ 2970 if (sa_res_key_unmatched) { 2971 spin_unlock(&dev->dev_reservation_lock); 2972 core_scsi3_put_pr_reg(pr_reg_n); 2973 return TCM_RESERVATION_CONFLICT; 2974 } 2975 /* 2976 * For an existing all registrants type reservation 2977 * with a zero SA rservation key, preempt the existing 2978 * reservation with the new PR type and scope. 2979 */ 2980 if (pr_res_holder && all_reg && !(sa_res_key)) { 2981 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2982 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2983 type, scope, preempt_type); 2984 2985 if (preempt_type == PREEMPT_AND_ABORT) 2986 core_scsi3_release_preempt_and_abort( 2987 &preempt_and_abort_list, pr_reg_n); 2988 } 2989 spin_unlock(&dev->dev_reservation_lock); 2990 2991 if (pr_tmpl->pr_aptpl_active) 2992 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2993 2994 core_scsi3_put_pr_reg(pr_reg_n); 2995 core_scsi3_pr_generation(cmd->se_dev); 2996 return 0; 2997 } 2998 /* 2999 * The PREEMPTing SA reservation key matches that of the 3000 * existing persistent reservation, first, we check if 3001 * we are preempting our own reservation. 3002 * From spc4r17, section 5.7.11.4.3 Preempting 3003 * persistent reservations and registration handling 3004 * 3005 * If an all registrants persistent reservation is not 3006 * present, it is not an error for the persistent 3007 * reservation holder to preempt itself (i.e., a 3008 * PERSISTENT RESERVE OUT with a PREEMPT service action 3009 * or a PREEMPT AND ABORT service action with the 3010 * SERVICE ACTION RESERVATION KEY value equal to the 3011 * persistent reservation holder's reservation key that 3012 * is received from the persistent reservation holder). 3013 * In that case, the device server shall establish the 3014 * new persistent reservation and maintain the 3015 * registration. 3016 */ 3017 prh_type = pr_res_holder->pr_res_type; 3018 prh_scope = pr_res_holder->pr_res_scope; 3019 /* 3020 * If the SERVICE ACTION RESERVATION KEY field identifies a 3021 * persistent reservation holder (see 5.7.10), the device 3022 * server shall perform a preempt by doing the following as 3023 * an uninterrupted series of actions: 3024 * 3025 * a) Release the persistent reservation for the holder 3026 * identified by the SERVICE ACTION RESERVATION KEY field; 3027 */ 3028 if (pr_reg_n != pr_res_holder) 3029 __core_scsi3_complete_pro_release(dev, 3030 pr_res_holder->pr_reg_nacl, 3031 dev->dev_pr_res_holder, 0, 0); 3032 /* 3033 * b) Remove the registrations for all I_T nexuses identified 3034 * by the SERVICE ACTION RESERVATION KEY field, except the 3035 * I_T nexus that is being used for the PERSISTENT RESERVE 3036 * OUT command. If an all registrants persistent reservation 3037 * is present and the SERVICE ACTION RESERVATION KEY field 3038 * is set to zero, then all registrations shall be removed 3039 * except for that of the I_T nexus that is being used for 3040 * the PERSISTENT RESERVE OUT command; 3041 */ 3042 spin_lock(&pr_tmpl->registration_lock); 3043 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3044 &pr_tmpl->registration_list, pr_reg_list) { 3045 3046 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3047 if (calling_it_nexus) 3048 continue; 3049 3050 if (pr_reg->pr_res_key != sa_res_key) 3051 continue; 3052 3053 pr_reg_nacl = pr_reg->pr_reg_nacl; 3054 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3055 __core_scsi3_free_registration(dev, pr_reg, 3056 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3057 calling_it_nexus); 3058 /* 3059 * e) Establish a unit attention condition for the initiator 3060 * port associated with every I_T nexus that lost its 3061 * persistent reservation and/or registration, with the 3062 * additional sense code set to REGISTRATIONS PREEMPTED; 3063 */ 3064 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3065 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3066 } 3067 spin_unlock(&pr_tmpl->registration_lock); 3068 /* 3069 * c) Establish a persistent reservation for the preempting 3070 * I_T nexus using the contents of the SCOPE and TYPE fields; 3071 */ 3072 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3073 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3074 type, scope, preempt_type); 3075 /* 3076 * d) Process tasks as defined in 5.7.1; 3077 * e) See above.. 3078 * f) If the type or scope has changed, then for every I_T nexus 3079 * whose reservation key was not removed, except for the I_T 3080 * nexus on which the PERSISTENT RESERVE OUT command was 3081 * received, the device server shall establish a unit 3082 * attention condition for the initiator port associated with 3083 * that I_T nexus, with the additional sense code set to 3084 * RESERVATIONS RELEASED. If the type or scope have not 3085 * changed, then no unit attention condition(s) shall be 3086 * established for this reason. 3087 */ 3088 if ((prh_type != type) || (prh_scope != scope)) { 3089 spin_lock(&pr_tmpl->registration_lock); 3090 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3091 &pr_tmpl->registration_list, pr_reg_list) { 3092 3093 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3094 if (calling_it_nexus) 3095 continue; 3096 3097 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3098 pr_reg->pr_res_mapped_lun, 0x2A, 3099 ASCQ_2AH_RESERVATIONS_RELEASED); 3100 } 3101 spin_unlock(&pr_tmpl->registration_lock); 3102 } 3103 spin_unlock(&dev->dev_reservation_lock); 3104 /* 3105 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3106 * All received CDBs for the matching existing reservation and 3107 * registrations undergo ABORT_TASK logic. 3108 * 3109 * From there, core_scsi3_release_preempt_and_abort() will 3110 * release every registration in the list (which have already 3111 * been removed from the primary pr_reg list), except the 3112 * new persistent reservation holder, the calling Initiator Port. 3113 */ 3114 if (preempt_type == PREEMPT_AND_ABORT) { 3115 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3116 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3117 pr_reg_n); 3118 } 3119 3120 if (pr_tmpl->pr_aptpl_active) 3121 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3122 3123 core_scsi3_put_pr_reg(pr_reg_n); 3124 core_scsi3_pr_generation(cmd->se_dev); 3125 return 0; 3126 } 3127 3128 static sense_reason_t 3129 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3130 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3131 { 3132 switch (type) { 3133 case PR_TYPE_WRITE_EXCLUSIVE: 3134 case PR_TYPE_EXCLUSIVE_ACCESS: 3135 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3136 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3137 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3138 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3139 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3140 sa_res_key, preempt_type); 3141 default: 3142 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3143 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3144 return TCM_INVALID_CDB_FIELD; 3145 } 3146 } 3147 3148 3149 static sense_reason_t 3150 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3151 u64 sa_res_key, int aptpl, int unreg) 3152 { 3153 struct se_session *se_sess = cmd->se_sess; 3154 struct se_device *dev = cmd->se_dev; 3155 struct se_dev_entry *dest_se_deve = NULL; 3156 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3157 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3158 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3159 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3160 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3161 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3162 unsigned char *buf; 3163 const unsigned char *initiator_str; 3164 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3165 u32 tid_len, tmp_tid_len; 3166 int new_reg = 0, type, scope, matching_iname; 3167 sense_reason_t ret; 3168 unsigned short rtpi; 3169 unsigned char proto_ident; 3170 3171 if (!se_sess || !se_lun) { 3172 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3173 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3174 } 3175 3176 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3177 se_tpg = se_sess->se_tpg; 3178 tf_ops = se_tpg->se_tpg_tfo; 3179 /* 3180 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3181 * Register behaviors for a REGISTER AND MOVE service action 3182 * 3183 * Locate the existing *pr_reg via struct se_node_acl pointers 3184 */ 3185 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3186 se_sess); 3187 if (!pr_reg) { 3188 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3189 " *pr_reg for REGISTER_AND_MOVE\n"); 3190 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3191 } 3192 /* 3193 * The provided reservation key much match the existing reservation key 3194 * provided during this initiator's I_T nexus registration. 3195 */ 3196 if (res_key != pr_reg->pr_res_key) { 3197 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3198 " res_key: 0x%016Lx does not match existing SA REGISTER" 3199 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3200 ret = TCM_RESERVATION_CONFLICT; 3201 goto out_put_pr_reg; 3202 } 3203 /* 3204 * The service active reservation key needs to be non zero 3205 */ 3206 if (!sa_res_key) { 3207 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3208 " sa_res_key\n"); 3209 ret = TCM_INVALID_PARAMETER_LIST; 3210 goto out_put_pr_reg; 3211 } 3212 3213 /* 3214 * Determine the Relative Target Port Identifier where the reservation 3215 * will be moved to for the TransportID containing SCSI initiator WWN 3216 * information. 3217 */ 3218 buf = transport_kmap_data_sg(cmd); 3219 if (!buf) { 3220 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3221 goto out_put_pr_reg; 3222 } 3223 3224 rtpi = (buf[18] & 0xff) << 8; 3225 rtpi |= buf[19] & 0xff; 3226 tid_len = (buf[20] & 0xff) << 24; 3227 tid_len |= (buf[21] & 0xff) << 16; 3228 tid_len |= (buf[22] & 0xff) << 8; 3229 tid_len |= buf[23] & 0xff; 3230 transport_kunmap_data_sg(cmd); 3231 buf = NULL; 3232 3233 if ((tid_len + 24) != cmd->data_length) { 3234 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3235 " does not equal CDB data_length: %u\n", tid_len, 3236 cmd->data_length); 3237 ret = TCM_INVALID_PARAMETER_LIST; 3238 goto out_put_pr_reg; 3239 } 3240 3241 spin_lock(&dev->se_port_lock); 3242 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3243 if (tmp_lun->lun_rtpi != rtpi) 3244 continue; 3245 dest_se_tpg = tmp_lun->lun_tpg; 3246 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3247 if (!dest_tf_ops) 3248 continue; 3249 3250 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3251 spin_unlock(&dev->se_port_lock); 3252 3253 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3254 pr_err("core_scsi3_tpg_depend_item() failed" 3255 " for dest_se_tpg\n"); 3256 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3257 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3258 goto out_put_pr_reg; 3259 } 3260 3261 spin_lock(&dev->se_port_lock); 3262 break; 3263 } 3264 spin_unlock(&dev->se_port_lock); 3265 3266 if (!dest_se_tpg || !dest_tf_ops) { 3267 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3268 " fabric ops from Relative Target Port Identifier:" 3269 " %hu\n", rtpi); 3270 ret = TCM_INVALID_PARAMETER_LIST; 3271 goto out_put_pr_reg; 3272 } 3273 3274 buf = transport_kmap_data_sg(cmd); 3275 if (!buf) { 3276 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3277 goto out_put_pr_reg; 3278 } 3279 proto_ident = (buf[24] & 0x0f); 3280 3281 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3282 " 0x%02x\n", proto_ident); 3283 3284 if (proto_ident != dest_se_tpg->proto_id) { 3285 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3286 " proto_ident: 0x%02x does not match ident: 0x%02x" 3287 " from fabric: %s\n", proto_ident, 3288 dest_se_tpg->proto_id, 3289 dest_tf_ops->get_fabric_name()); 3290 ret = TCM_INVALID_PARAMETER_LIST; 3291 goto out; 3292 } 3293 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3294 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3295 if (!initiator_str) { 3296 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3297 " initiator_str from Transport ID\n"); 3298 ret = TCM_INVALID_PARAMETER_LIST; 3299 goto out; 3300 } 3301 3302 transport_kunmap_data_sg(cmd); 3303 buf = NULL; 3304 3305 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3306 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3307 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3308 iport_ptr : ""); 3309 /* 3310 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3311 * action specifies a TransportID that is the same as the initiator port 3312 * of the I_T nexus for the command received, then the command shall 3313 * be terminated with CHECK CONDITION status, with the sense key set to 3314 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3315 * IN PARAMETER LIST. 3316 */ 3317 pr_reg_nacl = pr_reg->pr_reg_nacl; 3318 matching_iname = (!strcmp(initiator_str, 3319 pr_reg_nacl->initiatorname)) ? 1 : 0; 3320 if (!matching_iname) 3321 goto after_iport_check; 3322 3323 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3324 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3325 " matches: %s on received I_T Nexus\n", initiator_str, 3326 pr_reg_nacl->initiatorname); 3327 ret = TCM_INVALID_PARAMETER_LIST; 3328 goto out; 3329 } 3330 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3331 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3332 " matches: %s %s on received I_T Nexus\n", 3333 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3334 pr_reg->pr_reg_isid); 3335 ret = TCM_INVALID_PARAMETER_LIST; 3336 goto out; 3337 } 3338 after_iport_check: 3339 /* 3340 * Locate the destination struct se_node_acl from the received Transport ID 3341 */ 3342 mutex_lock(&dest_se_tpg->acl_node_mutex); 3343 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3344 initiator_str); 3345 if (dest_node_acl) 3346 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3347 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3348 3349 if (!dest_node_acl) { 3350 pr_err("Unable to locate %s dest_node_acl for" 3351 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3352 initiator_str); 3353 ret = TCM_INVALID_PARAMETER_LIST; 3354 goto out; 3355 } 3356 3357 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3358 pr_err("core_scsi3_nodeacl_depend_item() for" 3359 " dest_node_acl\n"); 3360 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3361 dest_node_acl = NULL; 3362 ret = TCM_INVALID_PARAMETER_LIST; 3363 goto out; 3364 } 3365 3366 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3367 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3368 dest_node_acl->initiatorname); 3369 3370 /* 3371 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3372 * PORT IDENTIFIER. 3373 */ 3374 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3375 if (!dest_se_deve) { 3376 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3377 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3378 ret = TCM_INVALID_PARAMETER_LIST; 3379 goto out; 3380 } 3381 3382 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3383 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3384 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3385 dest_se_deve = NULL; 3386 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3387 goto out; 3388 } 3389 3390 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3391 " ACL for dest_se_deve->mapped_lun: %llu\n", 3392 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3393 dest_se_deve->mapped_lun); 3394 3395 /* 3396 * A persistent reservation needs to already existing in order to 3397 * successfully complete the REGISTER_AND_MOVE service action.. 3398 */ 3399 spin_lock(&dev->dev_reservation_lock); 3400 pr_res_holder = dev->dev_pr_res_holder; 3401 if (!pr_res_holder) { 3402 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3403 " currently held\n"); 3404 spin_unlock(&dev->dev_reservation_lock); 3405 ret = TCM_INVALID_CDB_FIELD; 3406 goto out; 3407 } 3408 /* 3409 * The received on I_T Nexus must be the reservation holder. 3410 * 3411 * From spc4r17 section 5.7.8 Table 50 -- 3412 * Register behaviors for a REGISTER AND MOVE service action 3413 */ 3414 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3415 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3416 " Nexus is not reservation holder\n"); 3417 spin_unlock(&dev->dev_reservation_lock); 3418 ret = TCM_RESERVATION_CONFLICT; 3419 goto out; 3420 } 3421 /* 3422 * From spc4r17 section 5.7.8: registering and moving reservation 3423 * 3424 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3425 * action is received and the established persistent reservation is a 3426 * Write Exclusive - All Registrants type or Exclusive Access - 3427 * All Registrants type reservation, then the command shall be completed 3428 * with RESERVATION CONFLICT status. 3429 */ 3430 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3431 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3432 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3433 " reservation for type: %s\n", 3434 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3435 spin_unlock(&dev->dev_reservation_lock); 3436 ret = TCM_RESERVATION_CONFLICT; 3437 goto out; 3438 } 3439 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3440 /* 3441 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3442 */ 3443 type = pr_res_holder->pr_res_type; 3444 scope = pr_res_holder->pr_res_type; 3445 /* 3446 * c) Associate the reservation key specified in the SERVICE ACTION 3447 * RESERVATION KEY field with the I_T nexus specified as the 3448 * destination of the register and move, where: 3449 * A) The I_T nexus is specified by the TransportID and the 3450 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3451 * B) Regardless of the TransportID format used, the association for 3452 * the initiator port is based on either the initiator port name 3453 * (see 3.1.71) on SCSI transport protocols where port names are 3454 * required or the initiator port identifier (see 3.1.70) on SCSI 3455 * transport protocols where port names are not required; 3456 * d) Register the reservation key specified in the SERVICE ACTION 3457 * RESERVATION KEY field; 3458 * e) Retain the reservation key specified in the SERVICE ACTION 3459 * RESERVATION KEY field and associated information; 3460 * 3461 * Also, It is not an error for a REGISTER AND MOVE service action to 3462 * register an I_T nexus that is already registered with the same 3463 * reservation key or a different reservation key. 3464 */ 3465 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3466 iport_ptr); 3467 if (!dest_pr_reg) { 3468 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3469 kref_read(&dest_se_deve->pr_kref) != 0); 3470 3471 spin_unlock(&dev->dev_reservation_lock); 3472 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3473 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3474 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3475 ret = TCM_INVALID_PARAMETER_LIST; 3476 goto out; 3477 } 3478 spin_lock(&dev->dev_reservation_lock); 3479 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3480 iport_ptr); 3481 new_reg = 1; 3482 } 3483 /* 3484 * f) Release the persistent reservation for the persistent reservation 3485 * holder (i.e., the I_T nexus on which the 3486 */ 3487 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3488 dev->dev_pr_res_holder, 0, 0); 3489 /* 3490 * g) Move the persistent reservation to the specified I_T nexus using 3491 * the same scope and type as the persistent reservation released in 3492 * item f); and 3493 */ 3494 dev->dev_pr_res_holder = dest_pr_reg; 3495 dest_pr_reg->pr_res_holder = 1; 3496 dest_pr_reg->pr_res_type = type; 3497 pr_reg->pr_res_scope = scope; 3498 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3499 /* 3500 * Increment PRGeneration for existing registrations.. 3501 */ 3502 if (!new_reg) 3503 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3504 spin_unlock(&dev->dev_reservation_lock); 3505 3506 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3507 " created new reservation holder TYPE: %s on object RTPI:" 3508 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3509 core_scsi3_pr_dump_type(type), rtpi, 3510 dest_pr_reg->pr_res_generation); 3511 pr_debug("SPC-3 PR Successfully moved reservation from" 3512 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3513 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3514 i_buf, dest_tf_ops->get_fabric_name(), 3515 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3516 iport_ptr : ""); 3517 /* 3518 * It is now safe to release configfs group dependencies for destination 3519 * of Transport ID Initiator Device/Port Identifier 3520 */ 3521 core_scsi3_lunacl_undepend_item(dest_se_deve); 3522 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3523 core_scsi3_tpg_undepend_item(dest_se_tpg); 3524 /* 3525 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3526 * nexus on which PERSISTENT RESERVE OUT command was received. 3527 */ 3528 if (unreg) { 3529 spin_lock(&pr_tmpl->registration_lock); 3530 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3531 spin_unlock(&pr_tmpl->registration_lock); 3532 } else 3533 core_scsi3_put_pr_reg(pr_reg); 3534 3535 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3536 3537 transport_kunmap_data_sg(cmd); 3538 3539 core_scsi3_put_pr_reg(dest_pr_reg); 3540 return 0; 3541 out: 3542 if (buf) 3543 transport_kunmap_data_sg(cmd); 3544 if (dest_se_deve) 3545 core_scsi3_lunacl_undepend_item(dest_se_deve); 3546 if (dest_node_acl) 3547 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3548 core_scsi3_tpg_undepend_item(dest_se_tpg); 3549 3550 out_put_pr_reg: 3551 core_scsi3_put_pr_reg(pr_reg); 3552 return ret; 3553 } 3554 3555 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3556 { 3557 unsigned int __v1, __v2; 3558 3559 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3560 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3561 3562 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3563 } 3564 3565 /* 3566 * See spc4r17 section 6.14 Table 170 3567 */ 3568 sense_reason_t 3569 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3570 { 3571 struct se_device *dev = cmd->se_dev; 3572 unsigned char *cdb = &cmd->t_task_cdb[0]; 3573 unsigned char *buf; 3574 u64 res_key, sa_res_key; 3575 int sa, scope, type, aptpl; 3576 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3577 sense_reason_t ret; 3578 3579 /* 3580 * Following spc2r20 5.5.1 Reservations overview: 3581 * 3582 * If a logical unit has been reserved by any RESERVE command and is 3583 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3584 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3585 * initiator or service action and shall terminate with a RESERVATION 3586 * CONFLICT status. 3587 */ 3588 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3589 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3590 " SPC-2 reservation is held, returning" 3591 " RESERVATION_CONFLICT\n"); 3592 return TCM_RESERVATION_CONFLICT; 3593 } 3594 3595 /* 3596 * FIXME: A NULL struct se_session pointer means an this is not coming from 3597 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3598 */ 3599 if (!cmd->se_sess) 3600 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3601 3602 if (cmd->data_length < 24) { 3603 pr_warn("SPC-PR: Received PR OUT parameter list" 3604 " length too small: %u\n", cmd->data_length); 3605 return TCM_INVALID_PARAMETER_LIST; 3606 } 3607 3608 /* 3609 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3610 */ 3611 sa = (cdb[1] & 0x1f); 3612 scope = (cdb[2] & 0xf0); 3613 type = (cdb[2] & 0x0f); 3614 3615 buf = transport_kmap_data_sg(cmd); 3616 if (!buf) 3617 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3618 3619 /* 3620 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3621 */ 3622 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3623 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3624 /* 3625 * REGISTER_AND_MOVE uses a different SA parameter list containing 3626 * SCSI TransportIDs. 3627 */ 3628 if (sa != PRO_REGISTER_AND_MOVE) { 3629 spec_i_pt = (buf[20] & 0x08); 3630 all_tg_pt = (buf[20] & 0x04); 3631 aptpl = (buf[20] & 0x01); 3632 } else { 3633 aptpl = (buf[17] & 0x01); 3634 unreg = (buf[17] & 0x02); 3635 } 3636 /* 3637 * If the backend device has been configured to force APTPL metadata 3638 * write-out, go ahead and propigate aptpl=1 down now. 3639 */ 3640 if (dev->dev_attrib.force_pr_aptpl) 3641 aptpl = 1; 3642 3643 transport_kunmap_data_sg(cmd); 3644 buf = NULL; 3645 3646 /* 3647 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3648 */ 3649 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3650 return TCM_INVALID_PARAMETER_LIST; 3651 3652 /* 3653 * From spc4r17 section 6.14: 3654 * 3655 * If the SPEC_I_PT bit is set to zero, the service action is not 3656 * REGISTER AND MOVE, and the parameter list length is not 24, then 3657 * the command shall be terminated with CHECK CONDITION status, with 3658 * the sense key set to ILLEGAL REQUEST, and the additional sense 3659 * code set to PARAMETER LIST LENGTH ERROR. 3660 */ 3661 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3662 (cmd->data_length != 24)) { 3663 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3664 " list length: %u\n", cmd->data_length); 3665 return TCM_INVALID_PARAMETER_LIST; 3666 } 3667 3668 /* 3669 * (core_scsi3_emulate_pro_* function parameters 3670 * are defined by spc4r17 Table 174: 3671 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3672 */ 3673 switch (sa) { 3674 case PRO_REGISTER: 3675 ret = core_scsi3_emulate_pro_register(cmd, 3676 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3677 break; 3678 case PRO_RESERVE: 3679 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3680 break; 3681 case PRO_RELEASE: 3682 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3683 break; 3684 case PRO_CLEAR: 3685 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3686 break; 3687 case PRO_PREEMPT: 3688 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3689 res_key, sa_res_key, PREEMPT); 3690 break; 3691 case PRO_PREEMPT_AND_ABORT: 3692 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3693 res_key, sa_res_key, PREEMPT_AND_ABORT); 3694 break; 3695 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3696 ret = core_scsi3_emulate_pro_register(cmd, 3697 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3698 break; 3699 case PRO_REGISTER_AND_MOVE: 3700 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3701 sa_res_key, aptpl, unreg); 3702 break; 3703 default: 3704 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3705 " action: 0x%02x\n", cdb[1] & 0x1f); 3706 return TCM_INVALID_CDB_FIELD; 3707 } 3708 3709 if (!ret) 3710 target_complete_cmd(cmd, GOOD); 3711 return ret; 3712 } 3713 3714 /* 3715 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3716 * 3717 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3718 */ 3719 static sense_reason_t 3720 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3721 { 3722 struct se_device *dev = cmd->se_dev; 3723 struct t10_pr_registration *pr_reg; 3724 unsigned char *buf; 3725 u32 add_len = 0, off = 8; 3726 3727 if (cmd->data_length < 8) { 3728 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3729 " too small\n", cmd->data_length); 3730 return TCM_INVALID_CDB_FIELD; 3731 } 3732 3733 buf = transport_kmap_data_sg(cmd); 3734 if (!buf) 3735 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3736 3737 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3738 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3739 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3740 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3741 3742 spin_lock(&dev->t10_pr.registration_lock); 3743 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3744 pr_reg_list) { 3745 /* 3746 * Check for overflow of 8byte PRI READ_KEYS payload and 3747 * next reservation key list descriptor. 3748 */ 3749 if ((add_len + 8) > (cmd->data_length - 8)) 3750 break; 3751 3752 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3753 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3754 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3755 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3756 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3757 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3758 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3759 buf[off++] = (pr_reg->pr_res_key & 0xff); 3760 3761 add_len += 8; 3762 } 3763 spin_unlock(&dev->t10_pr.registration_lock); 3764 3765 buf[4] = ((add_len >> 24) & 0xff); 3766 buf[5] = ((add_len >> 16) & 0xff); 3767 buf[6] = ((add_len >> 8) & 0xff); 3768 buf[7] = (add_len & 0xff); 3769 3770 transport_kunmap_data_sg(cmd); 3771 3772 return 0; 3773 } 3774 3775 /* 3776 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3777 * 3778 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3779 */ 3780 static sense_reason_t 3781 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3782 { 3783 struct se_device *dev = cmd->se_dev; 3784 struct t10_pr_registration *pr_reg; 3785 unsigned char *buf; 3786 u64 pr_res_key; 3787 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3788 3789 if (cmd->data_length < 8) { 3790 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3791 " too small\n", cmd->data_length); 3792 return TCM_INVALID_CDB_FIELD; 3793 } 3794 3795 buf = transport_kmap_data_sg(cmd); 3796 if (!buf) 3797 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3798 3799 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3800 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3801 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3802 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3803 3804 spin_lock(&dev->dev_reservation_lock); 3805 pr_reg = dev->dev_pr_res_holder; 3806 if (pr_reg) { 3807 /* 3808 * Set the hardcoded Additional Length 3809 */ 3810 buf[4] = ((add_len >> 24) & 0xff); 3811 buf[5] = ((add_len >> 16) & 0xff); 3812 buf[6] = ((add_len >> 8) & 0xff); 3813 buf[7] = (add_len & 0xff); 3814 3815 if (cmd->data_length < 22) 3816 goto err; 3817 3818 /* 3819 * Set the Reservation key. 3820 * 3821 * From spc4r17, section 5.7.10: 3822 * A persistent reservation holder has its reservation key 3823 * returned in the parameter data from a PERSISTENT 3824 * RESERVE IN command with READ RESERVATION service action as 3825 * follows: 3826 * a) For a persistent reservation of the type Write Exclusive 3827 * - All Registrants or Exclusive Access All Regitrants, 3828 * the reservation key shall be set to zero; or 3829 * b) For all other persistent reservation types, the 3830 * reservation key shall be set to the registered 3831 * reservation key for the I_T nexus that holds the 3832 * persistent reservation. 3833 */ 3834 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3835 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3836 pr_res_key = 0; 3837 else 3838 pr_res_key = pr_reg->pr_res_key; 3839 3840 buf[8] = ((pr_res_key >> 56) & 0xff); 3841 buf[9] = ((pr_res_key >> 48) & 0xff); 3842 buf[10] = ((pr_res_key >> 40) & 0xff); 3843 buf[11] = ((pr_res_key >> 32) & 0xff); 3844 buf[12] = ((pr_res_key >> 24) & 0xff); 3845 buf[13] = ((pr_res_key >> 16) & 0xff); 3846 buf[14] = ((pr_res_key >> 8) & 0xff); 3847 buf[15] = (pr_res_key & 0xff); 3848 /* 3849 * Set the SCOPE and TYPE 3850 */ 3851 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3852 (pr_reg->pr_res_type & 0x0f); 3853 } 3854 3855 err: 3856 spin_unlock(&dev->dev_reservation_lock); 3857 transport_kunmap_data_sg(cmd); 3858 3859 return 0; 3860 } 3861 3862 /* 3863 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3864 * 3865 * See spc4r17 section 6.13.4 Table 165 3866 */ 3867 static sense_reason_t 3868 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3869 { 3870 struct se_device *dev = cmd->se_dev; 3871 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3872 unsigned char *buf; 3873 u16 add_len = 8; /* Hardcoded to 8. */ 3874 3875 if (cmd->data_length < 6) { 3876 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3877 " %u too small\n", cmd->data_length); 3878 return TCM_INVALID_CDB_FIELD; 3879 } 3880 3881 buf = transport_kmap_data_sg(cmd); 3882 if (!buf) 3883 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3884 3885 buf[0] = ((add_len >> 8) & 0xff); 3886 buf[1] = (add_len & 0xff); 3887 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3888 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3889 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3890 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3891 /* 3892 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3893 * set the TMV: Task Mask Valid bit. 3894 */ 3895 buf[3] |= 0x80; 3896 /* 3897 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3898 */ 3899 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3900 /* 3901 * PTPL_A: Persistence across Target Power Loss Active bit 3902 */ 3903 if (pr_tmpl->pr_aptpl_active) 3904 buf[3] |= 0x01; 3905 /* 3906 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3907 */ 3908 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3909 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3910 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3911 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3912 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3913 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3914 3915 transport_kunmap_data_sg(cmd); 3916 3917 return 0; 3918 } 3919 3920 /* 3921 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3922 * 3923 * See spc4r17 section 6.13.5 Table 168 and 169 3924 */ 3925 static sense_reason_t 3926 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3927 { 3928 struct se_device *dev = cmd->se_dev; 3929 struct se_node_acl *se_nacl; 3930 struct se_portal_group *se_tpg; 3931 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3932 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3933 unsigned char *buf; 3934 u32 add_desc_len = 0, add_len = 0; 3935 u32 off = 8; /* off into first Full Status descriptor */ 3936 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3937 int exp_desc_len, desc_len; 3938 bool all_reg = false; 3939 3940 if (cmd->data_length < 8) { 3941 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3942 " too small\n", cmd->data_length); 3943 return TCM_INVALID_CDB_FIELD; 3944 } 3945 3946 buf = transport_kmap_data_sg(cmd); 3947 if (!buf) 3948 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3949 3950 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3951 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3952 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3953 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3954 3955 spin_lock(&dev->dev_reservation_lock); 3956 if (dev->dev_pr_res_holder) { 3957 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3958 3959 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3960 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3961 all_reg = true; 3962 pr_res_type = pr_holder->pr_res_type; 3963 pr_res_scope = pr_holder->pr_res_scope; 3964 } 3965 } 3966 spin_unlock(&dev->dev_reservation_lock); 3967 3968 spin_lock(&pr_tmpl->registration_lock); 3969 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3970 &pr_tmpl->registration_list, pr_reg_list) { 3971 3972 se_nacl = pr_reg->pr_reg_nacl; 3973 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3974 add_desc_len = 0; 3975 3976 atomic_inc_mb(&pr_reg->pr_res_holders); 3977 spin_unlock(&pr_tmpl->registration_lock); 3978 /* 3979 * Determine expected length of $FABRIC_MOD specific 3980 * TransportID full status descriptor.. 3981 */ 3982 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3983 &format_code); 3984 if (exp_desc_len < 0 || 3985 exp_desc_len + add_len > cmd->data_length) { 3986 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3987 " out of buffer: %d\n", cmd->data_length); 3988 spin_lock(&pr_tmpl->registration_lock); 3989 atomic_dec_mb(&pr_reg->pr_res_holders); 3990 break; 3991 } 3992 /* 3993 * Set RESERVATION KEY 3994 */ 3995 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3996 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3997 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3998 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3999 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4000 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4001 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4002 buf[off++] = (pr_reg->pr_res_key & 0xff); 4003 off += 4; /* Skip Over Reserved area */ 4004 4005 /* 4006 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4007 */ 4008 if (pr_reg->pr_reg_all_tg_pt) 4009 buf[off] = 0x02; 4010 /* 4011 * The struct se_lun pointer will be present for the 4012 * reservation holder for PR_HOLDER bit. 4013 * 4014 * Also, if this registration is the reservation 4015 * holder or there is an All Registrants reservation 4016 * active, fill in SCOPE and TYPE in the next byte. 4017 */ 4018 if (pr_reg->pr_res_holder) { 4019 buf[off++] |= 0x01; 4020 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4021 (pr_reg->pr_res_type & 0x0f); 4022 } else if (all_reg) { 4023 buf[off++] |= 0x01; 4024 buf[off++] = (pr_res_scope & 0xf0) | 4025 (pr_res_type & 0x0f); 4026 } else { 4027 off += 2; 4028 } 4029 4030 off += 4; /* Skip over reserved area */ 4031 /* 4032 * From spc4r17 6.3.15: 4033 * 4034 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4035 * IDENTIFIER field contains the relative port identifier (see 4036 * 3.1.120) of the target port that is part of the I_T nexus 4037 * described by this full status descriptor. If the ALL_TG_PT 4038 * bit is set to one, the contents of the RELATIVE TARGET PORT 4039 * IDENTIFIER field are not defined by this standard. 4040 */ 4041 if (!pr_reg->pr_reg_all_tg_pt) { 4042 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 4043 4044 buf[off++] = ((sep_rtpi >> 8) & 0xff); 4045 buf[off++] = (sep_rtpi & 0xff); 4046 } else 4047 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4048 4049 buf[off+4] = se_tpg->proto_id; 4050 4051 /* 4052 * Now, have the $FABRIC_MOD fill in the transport ID. 4053 */ 4054 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4055 &format_code, &buf[off+4]); 4056 4057 spin_lock(&pr_tmpl->registration_lock); 4058 atomic_dec_mb(&pr_reg->pr_res_holders); 4059 4060 if (desc_len < 0) 4061 break; 4062 /* 4063 * Set the ADDITIONAL DESCRIPTOR LENGTH 4064 */ 4065 buf[off++] = ((desc_len >> 24) & 0xff); 4066 buf[off++] = ((desc_len >> 16) & 0xff); 4067 buf[off++] = ((desc_len >> 8) & 0xff); 4068 buf[off++] = (desc_len & 0xff); 4069 /* 4070 * Size of full desctipor header minus TransportID 4071 * containing $FABRIC_MOD specific) initiator device/port 4072 * WWN information. 4073 * 4074 * See spc4r17 Section 6.13.5 Table 169 4075 */ 4076 add_desc_len = (24 + desc_len); 4077 4078 off += desc_len; 4079 add_len += add_desc_len; 4080 } 4081 spin_unlock(&pr_tmpl->registration_lock); 4082 /* 4083 * Set ADDITIONAL_LENGTH 4084 */ 4085 buf[4] = ((add_len >> 24) & 0xff); 4086 buf[5] = ((add_len >> 16) & 0xff); 4087 buf[6] = ((add_len >> 8) & 0xff); 4088 buf[7] = (add_len & 0xff); 4089 4090 transport_kunmap_data_sg(cmd); 4091 4092 return 0; 4093 } 4094 4095 sense_reason_t 4096 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4097 { 4098 sense_reason_t ret; 4099 4100 /* 4101 * Following spc2r20 5.5.1 Reservations overview: 4102 * 4103 * If a logical unit has been reserved by any RESERVE command and is 4104 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4105 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4106 * initiator or service action and shall terminate with a RESERVATION 4107 * CONFLICT status. 4108 */ 4109 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4110 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4111 " SPC-2 reservation is held, returning" 4112 " RESERVATION_CONFLICT\n"); 4113 return TCM_RESERVATION_CONFLICT; 4114 } 4115 4116 switch (cmd->t_task_cdb[1] & 0x1f) { 4117 case PRI_READ_KEYS: 4118 ret = core_scsi3_pri_read_keys(cmd); 4119 break; 4120 case PRI_READ_RESERVATION: 4121 ret = core_scsi3_pri_read_reservation(cmd); 4122 break; 4123 case PRI_REPORT_CAPABILITIES: 4124 ret = core_scsi3_pri_report_capabilities(cmd); 4125 break; 4126 case PRI_READ_FULL_STATUS: 4127 ret = core_scsi3_pri_read_full_status(cmd); 4128 break; 4129 default: 4130 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4131 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4132 return TCM_INVALID_CDB_FIELD; 4133 } 4134 4135 if (!ret) 4136 target_complete_cmd(cmd, GOOD); 4137 return ret; 4138 } 4139 4140 sense_reason_t 4141 target_check_reservation(struct se_cmd *cmd) 4142 { 4143 struct se_device *dev = cmd->se_dev; 4144 sense_reason_t ret; 4145 4146 if (!cmd->se_sess) 4147 return 0; 4148 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4149 return 0; 4150 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4151 return 0; 4152 4153 spin_lock(&dev->dev_reservation_lock); 4154 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4155 ret = target_scsi2_reservation_check(cmd); 4156 else 4157 ret = target_scsi3_pr_reservation_check(cmd); 4158 spin_unlock(&dev->dev_reservation_lock); 4159 4160 return ret; 4161 } 4162