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 = get_unaligned_be32(&buf[24]); 1566 1567 if ((tpdl + 28) != cmd->data_length) { 1568 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1569 " does not equal CDB data_length: %u\n", tpdl, 1570 cmd->data_length); 1571 ret = TCM_INVALID_PARAMETER_LIST; 1572 goto out_unmap; 1573 } 1574 /* 1575 * Start processing the received transport IDs using the 1576 * receiving I_T Nexus portal's fabric dependent methods to 1577 * obtain the SCSI Initiator Port/Device Identifiers. 1578 */ 1579 ptr = &buf[28]; 1580 1581 while (tpdl > 0) { 1582 struct se_lun *dest_lun, *tmp_lun; 1583 1584 proto_ident = (ptr[0] & 0x0f); 1585 dest_tpg = NULL; 1586 1587 spin_lock(&dev->se_port_lock); 1588 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 1589 tmp_tpg = tmp_lun->lun_tpg; 1590 1591 /* 1592 * Look for the matching proto_ident provided by 1593 * the received TransportID 1594 */ 1595 if (tmp_tpg->proto_id != proto_ident) 1596 continue; 1597 dest_rtpi = tmp_lun->lun_rtpi; 1598 1599 i_str = target_parse_pr_out_transport_id(tmp_tpg, 1600 (const char *)ptr, &tid_len, &iport_ptr); 1601 if (!i_str) 1602 continue; 1603 1604 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1605 spin_unlock(&dev->se_port_lock); 1606 1607 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1608 pr_err(" core_scsi3_tpg_depend_item()" 1609 " for tmp_tpg\n"); 1610 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1611 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1612 goto out_unmap; 1613 } 1614 /* 1615 * Locate the destination initiator ACL to be registered 1616 * from the decoded fabric module specific TransportID 1617 * at *i_str. 1618 */ 1619 mutex_lock(&tmp_tpg->acl_node_mutex); 1620 dest_node_acl = __core_tpg_get_initiator_node_acl( 1621 tmp_tpg, i_str); 1622 if (dest_node_acl) 1623 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1624 mutex_unlock(&tmp_tpg->acl_node_mutex); 1625 1626 if (!dest_node_acl) { 1627 core_scsi3_tpg_undepend_item(tmp_tpg); 1628 spin_lock(&dev->se_port_lock); 1629 continue; 1630 } 1631 1632 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1633 pr_err("configfs_depend_item() failed" 1634 " for dest_node_acl->acl_group\n"); 1635 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1636 core_scsi3_tpg_undepend_item(tmp_tpg); 1637 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1638 goto out_unmap; 1639 } 1640 1641 dest_tpg = tmp_tpg; 1642 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1643 " %s Port RTPI: %hu\n", 1644 dest_tpg->se_tpg_tfo->get_fabric_name(), 1645 dest_node_acl->initiatorname, dest_rtpi); 1646 1647 spin_lock(&dev->se_port_lock); 1648 break; 1649 } 1650 spin_unlock(&dev->se_port_lock); 1651 1652 if (!dest_tpg) { 1653 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1654 " dest_tpg\n"); 1655 ret = TCM_INVALID_PARAMETER_LIST; 1656 goto out_unmap; 1657 } 1658 1659 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1660 " tid_len: %d for %s + %s\n", 1661 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1662 tpdl, tid_len, i_str, iport_ptr); 1663 1664 if (tid_len > tpdl) { 1665 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1666 " %u for Transport ID: %s\n", tid_len, ptr); 1667 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1668 core_scsi3_tpg_undepend_item(dest_tpg); 1669 ret = TCM_INVALID_PARAMETER_LIST; 1670 goto out_unmap; 1671 } 1672 /* 1673 * Locate the desintation struct se_dev_entry pointer for matching 1674 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1675 * Target Port. 1676 */ 1677 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1678 dest_rtpi); 1679 if (!dest_se_deve) { 1680 pr_err("Unable to locate %s dest_se_deve" 1681 " from destination RTPI: %hu\n", 1682 dest_tpg->se_tpg_tfo->get_fabric_name(), 1683 dest_rtpi); 1684 1685 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1686 core_scsi3_tpg_undepend_item(dest_tpg); 1687 ret = TCM_INVALID_PARAMETER_LIST; 1688 goto out_unmap; 1689 } 1690 1691 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1692 pr_err("core_scsi3_lunacl_depend_item()" 1693 " failed\n"); 1694 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 1695 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1696 core_scsi3_tpg_undepend_item(dest_tpg); 1697 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1698 goto out_unmap; 1699 } 1700 1701 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1702 " dest_se_deve mapped_lun: %llu\n", 1703 dest_tpg->se_tpg_tfo->get_fabric_name(), 1704 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1705 1706 /* 1707 * Skip any TransportIDs that already have a registration for 1708 * this target port. 1709 */ 1710 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1711 iport_ptr); 1712 if (pr_reg_e) { 1713 core_scsi3_put_pr_reg(pr_reg_e); 1714 core_scsi3_lunacl_undepend_item(dest_se_deve); 1715 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1716 core_scsi3_tpg_undepend_item(dest_tpg); 1717 ptr += tid_len; 1718 tpdl -= tid_len; 1719 tid_len = 0; 1720 continue; 1721 } 1722 /* 1723 * Allocate a struct pr_transport_id_holder and setup 1724 * the dest_node_acl and dest_se_deve pointers for the 1725 * loop below. 1726 */ 1727 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1728 GFP_KERNEL); 1729 if (!tidh_new) { 1730 pr_err("Unable to allocate tidh_new\n"); 1731 core_scsi3_lunacl_undepend_item(dest_se_deve); 1732 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1733 core_scsi3_tpg_undepend_item(dest_tpg); 1734 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1735 goto out_unmap; 1736 } 1737 INIT_LIST_HEAD(&tidh_new->dest_list); 1738 tidh_new->dest_tpg = dest_tpg; 1739 tidh_new->dest_node_acl = dest_node_acl; 1740 tidh_new->dest_se_deve = dest_se_deve; 1741 1742 /* 1743 * Allocate, but do NOT add the registration for the 1744 * TransportID referenced SCSI Initiator port. This 1745 * done because of the following from spc4r17 in section 1746 * 6.14.3 wrt SPEC_I_PT: 1747 * 1748 * "If a registration fails for any initiator port (e.g., if th 1749 * logical unit does not have enough resources available to 1750 * hold the registration information), no registrations shall be 1751 * made, and the command shall be terminated with 1752 * CHECK CONDITION status." 1753 * 1754 * That means we call __core_scsi3_alloc_registration() here, 1755 * and then call __core_scsi3_add_registration() in the 1756 * 2nd loop which will never fail. 1757 */ 1758 dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 1759 kref_read(&dest_se_deve->pr_kref) != 0); 1760 1761 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1762 dest_node_acl, dest_lun, dest_se_deve, 1763 dest_se_deve->mapped_lun, iport_ptr, 1764 sa_res_key, all_tg_pt, aptpl); 1765 if (!dest_pr_reg) { 1766 core_scsi3_lunacl_undepend_item(dest_se_deve); 1767 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1768 core_scsi3_tpg_undepend_item(dest_tpg); 1769 kfree(tidh_new); 1770 ret = TCM_INVALID_PARAMETER_LIST; 1771 goto out_unmap; 1772 } 1773 tidh_new->dest_pr_reg = dest_pr_reg; 1774 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1775 1776 ptr += tid_len; 1777 tpdl -= tid_len; 1778 tid_len = 0; 1779 1780 } 1781 1782 transport_kunmap_data_sg(cmd); 1783 1784 /* 1785 * Go ahead and create a registrations from tid_dest_list for the 1786 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1787 * and dest_se_deve. 1788 * 1789 * The SA Reservation Key from the PROUT is set for the 1790 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1791 * means that the TransportID Initiator port will be 1792 * registered on all of the target ports in the SCSI target device 1793 * ALL_TG_PT=0 means the registration will only be for the 1794 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1795 * was received. 1796 */ 1797 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1798 dest_tpg = tidh->dest_tpg; 1799 dest_node_acl = tidh->dest_node_acl; 1800 dest_se_deve = tidh->dest_se_deve; 1801 dest_pr_reg = tidh->dest_pr_reg; 1802 1803 list_del(&tidh->dest_list); 1804 kfree(tidh); 1805 1806 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1807 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1808 1809 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1810 dest_pr_reg, 0, 0); 1811 1812 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1813 " registered Transport ID for Node: %s%s Mapped LUN:" 1814 " %llu\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1815 dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? 1816 dest_se_deve->mapped_lun : 0); 1817 1818 if (!dest_se_deve) { 1819 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1820 target_pr_kref_release); 1821 continue; 1822 } 1823 core_scsi3_lunacl_undepend_item(dest_se_deve); 1824 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1825 core_scsi3_tpg_undepend_item(dest_tpg); 1826 } 1827 1828 return 0; 1829 out_unmap: 1830 transport_kunmap_data_sg(cmd); 1831 out: 1832 /* 1833 * For the failure case, release everything from tid_dest_list 1834 * including *dest_pr_reg and the configfs dependances.. 1835 */ 1836 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1837 dest_tpg = tidh->dest_tpg; 1838 dest_node_acl = tidh->dest_node_acl; 1839 dest_se_deve = tidh->dest_se_deve; 1840 dest_pr_reg = tidh->dest_pr_reg; 1841 1842 list_del(&tidh->dest_list); 1843 kfree(tidh); 1844 /* 1845 * Release any extra ALL_TG_PT=1 registrations for 1846 * the SPEC_I_PT=1 case. 1847 */ 1848 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1849 &dest_pr_reg->pr_reg_atp_list, 1850 pr_reg_atp_mem_list) { 1851 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1852 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1853 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1854 } 1855 1856 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1857 1858 if (!dest_se_deve) { 1859 kref_put(&local_pr_reg->pr_reg_deve->pr_kref, 1860 target_pr_kref_release); 1861 continue; 1862 } 1863 core_scsi3_lunacl_undepend_item(dest_se_deve); 1864 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1865 core_scsi3_tpg_undepend_item(dest_tpg); 1866 } 1867 return ret; 1868 } 1869 1870 static int core_scsi3_update_aptpl_buf( 1871 struct se_device *dev, 1872 unsigned char *buf, 1873 u32 pr_aptpl_buf_len) 1874 { 1875 struct se_portal_group *tpg; 1876 struct t10_pr_registration *pr_reg; 1877 unsigned char tmp[512], isid_buf[32]; 1878 ssize_t len = 0; 1879 int reg_count = 0; 1880 int ret = 0; 1881 1882 spin_lock(&dev->dev_reservation_lock); 1883 spin_lock(&dev->t10_pr.registration_lock); 1884 /* 1885 * Walk the registration list.. 1886 */ 1887 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1888 pr_reg_list) { 1889 1890 tmp[0] = '\0'; 1891 isid_buf[0] = '\0'; 1892 tpg = pr_reg->pr_reg_nacl->se_tpg; 1893 /* 1894 * Write out any ISID value to APTPL metadata that was included 1895 * in the original registration. 1896 */ 1897 if (pr_reg->isid_present_at_reg) 1898 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1899 pr_reg->pr_reg_isid); 1900 /* 1901 * Include special metadata if the pr_reg matches the 1902 * reservation holder. 1903 */ 1904 if (dev->dev_pr_res_holder == pr_reg) { 1905 snprintf(tmp, 512, "PR_REG_START: %d" 1906 "\ninitiator_fabric=%s\n" 1907 "initiator_node=%s\n%s" 1908 "sa_res_key=%llu\n" 1909 "res_holder=1\nres_type=%02x\n" 1910 "res_scope=%02x\nres_all_tg_pt=%d\n" 1911 "mapped_lun=%llu\n", reg_count, 1912 tpg->se_tpg_tfo->get_fabric_name(), 1913 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1914 pr_reg->pr_res_key, pr_reg->pr_res_type, 1915 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1916 pr_reg->pr_res_mapped_lun); 1917 } else { 1918 snprintf(tmp, 512, "PR_REG_START: %d\n" 1919 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1920 "sa_res_key=%llu\nres_holder=0\n" 1921 "res_all_tg_pt=%d\nmapped_lun=%llu\n", 1922 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1923 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1924 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1925 pr_reg->pr_res_mapped_lun); 1926 } 1927 1928 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1929 pr_err("Unable to update renaming APTPL metadata," 1930 " reallocating larger buffer\n"); 1931 ret = -EMSGSIZE; 1932 goto out; 1933 } 1934 len += sprintf(buf+len, "%s", tmp); 1935 1936 /* 1937 * Include information about the associated SCSI target port. 1938 */ 1939 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1940 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:" 1941 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1942 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1943 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1944 pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun, 1945 reg_count); 1946 1947 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1948 pr_err("Unable to update renaming APTPL metadata," 1949 " reallocating larger buffer\n"); 1950 ret = -EMSGSIZE; 1951 goto out; 1952 } 1953 len += sprintf(buf+len, "%s", tmp); 1954 reg_count++; 1955 } 1956 1957 if (!reg_count) 1958 len += sprintf(buf+len, "No Registrations or Reservations"); 1959 1960 out: 1961 spin_unlock(&dev->t10_pr.registration_lock); 1962 spin_unlock(&dev->dev_reservation_lock); 1963 1964 return ret; 1965 } 1966 1967 static int __core_scsi3_write_aptpl_to_file( 1968 struct se_device *dev, 1969 unsigned char *buf) 1970 { 1971 struct t10_wwn *wwn = &dev->t10_wwn; 1972 struct file *file; 1973 int flags = O_RDWR | O_CREAT | O_TRUNC; 1974 char path[512]; 1975 u32 pr_aptpl_buf_len; 1976 int ret; 1977 loff_t pos = 0; 1978 1979 memset(path, 0, 512); 1980 1981 if (strlen(&wwn->unit_serial[0]) >= 512) { 1982 pr_err("WWN value for struct se_device does not fit" 1983 " into path buffer\n"); 1984 return -EMSGSIZE; 1985 } 1986 1987 snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); 1988 file = filp_open(path, flags, 0600); 1989 if (IS_ERR(file)) { 1990 pr_err("filp_open(%s) for APTPL metadata" 1991 " failed\n", path); 1992 return PTR_ERR(file); 1993 } 1994 1995 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1996 1997 ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos); 1998 1999 if (ret < 0) 2000 pr_debug("Error writing APTPL metadata file: %s\n", path); 2001 fput(file); 2002 2003 return (ret < 0) ? -EIO : 0; 2004 } 2005 2006 /* 2007 * Clear the APTPL metadata if APTPL has been disabled, otherwise 2008 * write out the updated metadata to struct file for this SCSI device. 2009 */ 2010 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 2011 { 2012 unsigned char *buf; 2013 int rc, len = PR_APTPL_BUF_LEN; 2014 2015 if (!aptpl) { 2016 char *null_buf = "No Registrations or Reservations\n"; 2017 2018 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 2019 dev->t10_pr.pr_aptpl_active = 0; 2020 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 2021 2022 if (rc) 2023 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2024 2025 return 0; 2026 } 2027 retry: 2028 buf = vzalloc(len); 2029 if (!buf) 2030 return TCM_OUT_OF_RESOURCES; 2031 2032 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 2033 if (rc < 0) { 2034 vfree(buf); 2035 len *= 2; 2036 goto retry; 2037 } 2038 2039 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 2040 if (rc != 0) { 2041 pr_err("SPC-3 PR: Could not update APTPL\n"); 2042 vfree(buf); 2043 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2044 } 2045 dev->t10_pr.pr_aptpl_active = 1; 2046 vfree(buf); 2047 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 2048 return 0; 2049 } 2050 2051 static sense_reason_t 2052 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 2053 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2054 { 2055 struct se_session *se_sess = cmd->se_sess; 2056 struct se_device *dev = cmd->se_dev; 2057 struct se_lun *se_lun = cmd->se_lun; 2058 struct se_portal_group *se_tpg; 2059 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2060 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2061 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2062 sense_reason_t ret = TCM_NO_SENSE; 2063 int pr_holder = 0, type; 2064 2065 if (!se_sess || !se_lun) { 2066 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2067 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2068 } 2069 se_tpg = se_sess->se_tpg; 2070 2071 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2072 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2073 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2074 PR_REG_ISID_LEN); 2075 isid_ptr = &isid_buf[0]; 2076 } 2077 /* 2078 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2079 */ 2080 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2081 if (!pr_reg) { 2082 if (res_key) { 2083 pr_warn("SPC-3 PR: Reservation Key non-zero" 2084 " for SA REGISTER, returning CONFLICT\n"); 2085 return TCM_RESERVATION_CONFLICT; 2086 } 2087 /* 2088 * Do nothing but return GOOD status. 2089 */ 2090 if (!sa_res_key) 2091 return 0; 2092 2093 if (!spec_i_pt) { 2094 /* 2095 * Perform the Service Action REGISTER on the Initiator 2096 * Port Endpoint that the PRO was received from on the 2097 * Logical Unit of the SCSI device server. 2098 */ 2099 if (core_scsi3_alloc_registration(cmd->se_dev, 2100 se_sess->se_node_acl, cmd->se_lun, 2101 NULL, cmd->orig_fe_lun, isid_ptr, 2102 sa_res_key, all_tg_pt, aptpl, 2103 register_type, 0)) { 2104 pr_err("Unable to allocate" 2105 " struct t10_pr_registration\n"); 2106 return TCM_INVALID_PARAMETER_LIST; 2107 } 2108 } else { 2109 /* 2110 * Register both the Initiator port that received 2111 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2112 * TransportID from Parameter list and loop through 2113 * fabric dependent parameter list while calling 2114 * logic from of core_scsi3_alloc_registration() for 2115 * each TransportID provided SCSI Initiator Port/Device 2116 */ 2117 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2118 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2119 if (ret != 0) 2120 return ret; 2121 } 2122 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2123 } 2124 2125 /* ok, existing registration */ 2126 2127 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2128 pr_err("SPC-3 PR REGISTER: Received" 2129 " res_key: 0x%016Lx does not match" 2130 " existing SA REGISTER res_key:" 2131 " 0x%016Lx\n", res_key, 2132 pr_reg->pr_res_key); 2133 ret = TCM_RESERVATION_CONFLICT; 2134 goto out; 2135 } 2136 2137 if (spec_i_pt) { 2138 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2139 " set on a registered nexus\n"); 2140 ret = TCM_INVALID_PARAMETER_LIST; 2141 goto out; 2142 } 2143 2144 /* 2145 * An existing ALL_TG_PT=1 registration being released 2146 * must also set ALL_TG_PT=1 in the incoming PROUT. 2147 */ 2148 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2149 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2150 " registration exists, but ALL_TG_PT=1 bit not" 2151 " present in received PROUT\n"); 2152 ret = TCM_INVALID_CDB_FIELD; 2153 goto out; 2154 } 2155 2156 /* 2157 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2158 */ 2159 if (sa_res_key) { 2160 /* 2161 * Increment PRgeneration counter for struct se_device" 2162 * upon a successful REGISTER, see spc4r17 section 6.3.2 2163 * READ_KEYS service action. 2164 */ 2165 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2166 pr_reg->pr_res_key = sa_res_key; 2167 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2168 " Key for %s to: 0x%016Lx PRgeneration:" 2169 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2170 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2171 pr_reg->pr_reg_nacl->initiatorname, 2172 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2173 2174 } else { 2175 /* 2176 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2177 */ 2178 type = pr_reg->pr_res_type; 2179 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2180 pr_reg); 2181 if (pr_holder < 0) { 2182 ret = TCM_RESERVATION_CONFLICT; 2183 goto out; 2184 } 2185 2186 spin_lock(&pr_tmpl->registration_lock); 2187 /* 2188 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2189 * and matching pr_res_key. 2190 */ 2191 if (pr_reg->pr_reg_all_tg_pt) { 2192 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2193 &pr_tmpl->registration_list, 2194 pr_reg_list) { 2195 2196 if (!pr_reg_p->pr_reg_all_tg_pt) 2197 continue; 2198 if (pr_reg_p->pr_res_key != res_key) 2199 continue; 2200 if (pr_reg == pr_reg_p) 2201 continue; 2202 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2203 pr_reg_p->pr_reg_nacl->initiatorname)) 2204 continue; 2205 2206 __core_scsi3_free_registration(dev, 2207 pr_reg_p, NULL, 0); 2208 } 2209 } 2210 2211 /* 2212 * Release the calling I_T Nexus registration now.. 2213 */ 2214 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2215 pr_reg = NULL; 2216 2217 /* 2218 * From spc4r17, section 5.7.11.3 Unregistering 2219 * 2220 * If the persistent reservation is a registrants only 2221 * type, the device server shall establish a unit 2222 * attention condition for the initiator port associated 2223 * with every registered I_T nexus except for the I_T 2224 * nexus on which the PERSISTENT RESERVE OUT command was 2225 * received, with the additional sense code set to 2226 * RESERVATIONS RELEASED. 2227 */ 2228 if (pr_holder && 2229 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2230 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2231 list_for_each_entry(pr_reg_p, 2232 &pr_tmpl->registration_list, 2233 pr_reg_list) { 2234 2235 target_ua_allocate_lun( 2236 pr_reg_p->pr_reg_nacl, 2237 pr_reg_p->pr_res_mapped_lun, 2238 0x2A, 2239 ASCQ_2AH_RESERVATIONS_RELEASED); 2240 } 2241 } 2242 2243 spin_unlock(&pr_tmpl->registration_lock); 2244 } 2245 2246 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2247 2248 out: 2249 if (pr_reg) 2250 core_scsi3_put_pr_reg(pr_reg); 2251 return ret; 2252 } 2253 2254 unsigned char *core_scsi3_pr_dump_type(int type) 2255 { 2256 switch (type) { 2257 case PR_TYPE_WRITE_EXCLUSIVE: 2258 return "Write Exclusive Access"; 2259 case PR_TYPE_EXCLUSIVE_ACCESS: 2260 return "Exclusive Access"; 2261 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2262 return "Write Exclusive Access, Registrants Only"; 2263 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2264 return "Exclusive Access, Registrants Only"; 2265 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2266 return "Write Exclusive Access, All Registrants"; 2267 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2268 return "Exclusive Access, All Registrants"; 2269 default: 2270 break; 2271 } 2272 2273 return "Unknown SPC-3 PR Type"; 2274 } 2275 2276 static sense_reason_t 2277 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2278 { 2279 struct se_device *dev = cmd->se_dev; 2280 struct se_session *se_sess = cmd->se_sess; 2281 struct se_lun *se_lun = cmd->se_lun; 2282 struct t10_pr_registration *pr_reg, *pr_res_holder; 2283 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2284 char i_buf[PR_REG_ISID_ID_LEN]; 2285 sense_reason_t ret; 2286 2287 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2288 2289 if (!se_sess || !se_lun) { 2290 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2291 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2292 } 2293 /* 2294 * Locate the existing *pr_reg via struct se_node_acl pointers 2295 */ 2296 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2297 se_sess); 2298 if (!pr_reg) { 2299 pr_err("SPC-3 PR: Unable to locate" 2300 " PR_REGISTERED *pr_reg for RESERVE\n"); 2301 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2302 } 2303 /* 2304 * From spc4r17 Section 5.7.9: Reserving: 2305 * 2306 * An application client creates a persistent reservation by issuing 2307 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2308 * a registered I_T nexus with the following parameters: 2309 * a) RESERVATION KEY set to the value of the reservation key that is 2310 * registered with the logical unit for the I_T nexus; and 2311 */ 2312 if (res_key != pr_reg->pr_res_key) { 2313 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2314 " does not match existing SA REGISTER res_key:" 2315 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2316 ret = TCM_RESERVATION_CONFLICT; 2317 goto out_put_pr_reg; 2318 } 2319 /* 2320 * From spc4r17 Section 5.7.9: Reserving: 2321 * 2322 * From above: 2323 * b) TYPE field and SCOPE field set to the persistent reservation 2324 * being created. 2325 * 2326 * Only one persistent reservation is allowed at a time per logical unit 2327 * and that persistent reservation has a scope of LU_SCOPE. 2328 */ 2329 if (scope != PR_SCOPE_LU_SCOPE) { 2330 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2331 ret = TCM_INVALID_PARAMETER_LIST; 2332 goto out_put_pr_reg; 2333 } 2334 /* 2335 * See if we have an existing PR reservation holder pointer at 2336 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2337 * *pr_res_holder. 2338 */ 2339 spin_lock(&dev->dev_reservation_lock); 2340 pr_res_holder = dev->dev_pr_res_holder; 2341 if (pr_res_holder) { 2342 /* 2343 * From spc4r17 Section 5.7.9: Reserving: 2344 * 2345 * If the device server receives a PERSISTENT RESERVE OUT 2346 * command from an I_T nexus other than a persistent reservation 2347 * holder (see 5.7.10) that attempts to create a persistent 2348 * reservation when a persistent reservation already exists for 2349 * the logical unit, then the command shall be completed with 2350 * RESERVATION CONFLICT status. 2351 */ 2352 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2353 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2354 pr_err("SPC-3 PR: Attempted RESERVE from" 2355 " [%s]: %s while reservation already held by" 2356 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2357 cmd->se_tfo->get_fabric_name(), 2358 se_sess->se_node_acl->initiatorname, 2359 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2360 pr_res_holder->pr_reg_nacl->initiatorname); 2361 2362 spin_unlock(&dev->dev_reservation_lock); 2363 ret = TCM_RESERVATION_CONFLICT; 2364 goto out_put_pr_reg; 2365 } 2366 /* 2367 * From spc4r17 Section 5.7.9: Reserving: 2368 * 2369 * If a persistent reservation holder attempts to modify the 2370 * type or scope of an existing persistent reservation, the 2371 * command shall be completed with RESERVATION CONFLICT status. 2372 */ 2373 if ((pr_res_holder->pr_res_type != type) || 2374 (pr_res_holder->pr_res_scope != scope)) { 2375 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2376 pr_err("SPC-3 PR: Attempted RESERVE from" 2377 " [%s]: %s trying to change TYPE and/or SCOPE," 2378 " while reservation already held by [%s]: %s," 2379 " returning RESERVATION_CONFLICT\n", 2380 cmd->se_tfo->get_fabric_name(), 2381 se_sess->se_node_acl->initiatorname, 2382 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2383 pr_res_holder->pr_reg_nacl->initiatorname); 2384 2385 spin_unlock(&dev->dev_reservation_lock); 2386 ret = TCM_RESERVATION_CONFLICT; 2387 goto out_put_pr_reg; 2388 } 2389 /* 2390 * From spc4r17 Section 5.7.9: Reserving: 2391 * 2392 * If the device server receives a PERSISTENT RESERVE OUT 2393 * command with RESERVE service action where the TYPE field and 2394 * the SCOPE field contain the same values as the existing type 2395 * and scope from a persistent reservation holder, it shall not 2396 * make any change to the existing persistent reservation and 2397 * shall completethe command with GOOD status. 2398 */ 2399 spin_unlock(&dev->dev_reservation_lock); 2400 ret = 0; 2401 goto out_put_pr_reg; 2402 } 2403 /* 2404 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2405 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2406 */ 2407 pr_reg->pr_res_scope = scope; 2408 pr_reg->pr_res_type = type; 2409 pr_reg->pr_res_holder = 1; 2410 dev->dev_pr_res_holder = pr_reg; 2411 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2412 2413 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2414 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2415 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2416 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2417 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2418 cmd->se_tfo->get_fabric_name(), 2419 se_sess->se_node_acl->initiatorname, 2420 i_buf); 2421 spin_unlock(&dev->dev_reservation_lock); 2422 2423 if (pr_tmpl->pr_aptpl_active) 2424 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2425 2426 ret = 0; 2427 out_put_pr_reg: 2428 core_scsi3_put_pr_reg(pr_reg); 2429 return ret; 2430 } 2431 2432 static sense_reason_t 2433 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2434 u64 res_key) 2435 { 2436 switch (type) { 2437 case PR_TYPE_WRITE_EXCLUSIVE: 2438 case PR_TYPE_EXCLUSIVE_ACCESS: 2439 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2440 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2441 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2442 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2443 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2444 default: 2445 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2446 " 0x%02x\n", type); 2447 return TCM_INVALID_CDB_FIELD; 2448 } 2449 } 2450 2451 /* 2452 * Called with struct se_device->dev_reservation_lock held. 2453 */ 2454 static void __core_scsi3_complete_pro_release( 2455 struct se_device *dev, 2456 struct se_node_acl *se_nacl, 2457 struct t10_pr_registration *pr_reg, 2458 int explicit, 2459 int unreg) 2460 { 2461 const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2462 char i_buf[PR_REG_ISID_ID_LEN]; 2463 int pr_res_type = 0, pr_res_scope = 0; 2464 2465 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2466 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2467 /* 2468 * Go ahead and release the current PR reservation holder. 2469 * If an All Registrants reservation is currently active and 2470 * a unregister operation is requested, replace the current 2471 * dev_pr_res_holder with another active registration. 2472 */ 2473 if (dev->dev_pr_res_holder) { 2474 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2475 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2476 dev->dev_pr_res_holder->pr_res_type = 0; 2477 dev->dev_pr_res_holder->pr_res_scope = 0; 2478 dev->dev_pr_res_holder->pr_res_holder = 0; 2479 dev->dev_pr_res_holder = NULL; 2480 } 2481 if (!unreg) 2482 goto out; 2483 2484 spin_lock(&dev->t10_pr.registration_lock); 2485 list_del_init(&pr_reg->pr_reg_list); 2486 /* 2487 * If the I_T nexus is a reservation holder, the persistent reservation 2488 * is of an all registrants type, and the I_T nexus is the last remaining 2489 * registered I_T nexus, then the device server shall also release the 2490 * persistent reservation. 2491 */ 2492 if (!list_empty(&dev->t10_pr.registration_list) && 2493 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2494 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2495 dev->dev_pr_res_holder = 2496 list_entry(dev->t10_pr.registration_list.next, 2497 struct t10_pr_registration, pr_reg_list); 2498 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2499 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2500 dev->dev_pr_res_holder->pr_res_holder = 1; 2501 } 2502 spin_unlock(&dev->t10_pr.registration_lock); 2503 out: 2504 if (!dev->dev_pr_res_holder) { 2505 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2506 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2507 tfo->get_fabric_name(), (explicit) ? "explicit" : 2508 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2509 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2510 } 2511 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2512 tfo->get_fabric_name(), se_nacl->initiatorname, 2513 i_buf); 2514 /* 2515 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2516 */ 2517 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2518 } 2519 2520 static sense_reason_t 2521 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2522 u64 res_key) 2523 { 2524 struct se_device *dev = cmd->se_dev; 2525 struct se_session *se_sess = cmd->se_sess; 2526 struct se_lun *se_lun = cmd->se_lun; 2527 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2528 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2529 sense_reason_t ret = 0; 2530 2531 if (!se_sess || !se_lun) { 2532 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2533 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2534 } 2535 /* 2536 * Locate the existing *pr_reg via struct se_node_acl pointers 2537 */ 2538 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2539 if (!pr_reg) { 2540 pr_err("SPC-3 PR: Unable to locate" 2541 " PR_REGISTERED *pr_reg for RELEASE\n"); 2542 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2543 } 2544 /* 2545 * From spc4r17 Section 5.7.11.2 Releasing: 2546 * 2547 * If there is no persistent reservation or in response to a persistent 2548 * reservation release request from a registered I_T nexus that is not a 2549 * persistent reservation holder (see 5.7.10), the device server shall 2550 * do the following: 2551 * 2552 * a) Not release the persistent reservation, if any; 2553 * b) Not remove any registrations; and 2554 * c) Complete the command with GOOD status. 2555 */ 2556 spin_lock(&dev->dev_reservation_lock); 2557 pr_res_holder = dev->dev_pr_res_holder; 2558 if (!pr_res_holder) { 2559 /* 2560 * No persistent reservation, return GOOD status. 2561 */ 2562 spin_unlock(&dev->dev_reservation_lock); 2563 goto out_put_pr_reg; 2564 } 2565 2566 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 2567 /* 2568 * Release request from a registered I_T nexus that is not a 2569 * persistent reservation holder. return GOOD status. 2570 */ 2571 spin_unlock(&dev->dev_reservation_lock); 2572 goto out_put_pr_reg; 2573 } 2574 2575 /* 2576 * From spc4r17 Section 5.7.11.2 Releasing: 2577 * 2578 * Only the persistent reservation holder (see 5.7.10) is allowed to 2579 * release a persistent reservation. 2580 * 2581 * An application client releases the persistent reservation by issuing 2582 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2583 * an I_T nexus that is a persistent reservation holder with the 2584 * following parameters: 2585 * 2586 * a) RESERVATION KEY field set to the value of the reservation key 2587 * that is registered with the logical unit for the I_T nexus; 2588 */ 2589 if (res_key != pr_reg->pr_res_key) { 2590 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2591 " does not match existing SA REGISTER res_key:" 2592 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2593 spin_unlock(&dev->dev_reservation_lock); 2594 ret = TCM_RESERVATION_CONFLICT; 2595 goto out_put_pr_reg; 2596 } 2597 /* 2598 * From spc4r17 Section 5.7.11.2 Releasing and above: 2599 * 2600 * b) TYPE field and SCOPE field set to match the persistent 2601 * reservation being released. 2602 */ 2603 if ((pr_res_holder->pr_res_type != type) || 2604 (pr_res_holder->pr_res_scope != scope)) { 2605 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2606 pr_err("SPC-3 PR RELEASE: Attempted to release" 2607 " reservation from [%s]: %s with different TYPE " 2608 "and/or SCOPE while reservation already held by" 2609 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2610 cmd->se_tfo->get_fabric_name(), 2611 se_sess->se_node_acl->initiatorname, 2612 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2613 pr_res_holder->pr_reg_nacl->initiatorname); 2614 2615 spin_unlock(&dev->dev_reservation_lock); 2616 ret = TCM_RESERVATION_CONFLICT; 2617 goto out_put_pr_reg; 2618 } 2619 /* 2620 * In response to a persistent reservation release request from the 2621 * persistent reservation holder the device server shall perform a 2622 * release by doing the following as an uninterrupted series of actions: 2623 * a) Release the persistent reservation; 2624 * b) Not remove any registration(s); 2625 * c) If the released persistent reservation is a registrants only type 2626 * or all registrants type persistent reservation, 2627 * the device server shall establish a unit attention condition for 2628 * the initiator port associated with every regis- 2629 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2630 * RESERVE OUT command with RELEASE service action was received, 2631 * with the additional sense code set to RESERVATIONS RELEASED; and 2632 * d) If the persistent reservation is of any other type, the device 2633 * server shall not establish a unit attention condition. 2634 */ 2635 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2636 pr_reg, 1, 0); 2637 2638 spin_unlock(&dev->dev_reservation_lock); 2639 2640 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2641 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2642 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2643 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2644 /* 2645 * If no UNIT ATTENTION conditions will be established for 2646 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2647 * go ahead and check for APTPL=1 update+write below 2648 */ 2649 goto write_aptpl; 2650 } 2651 2652 spin_lock(&pr_tmpl->registration_lock); 2653 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2654 pr_reg_list) { 2655 /* 2656 * Do not establish a UNIT ATTENTION condition 2657 * for the calling I_T Nexus 2658 */ 2659 if (pr_reg_p == pr_reg) 2660 continue; 2661 2662 target_ua_allocate_lun(pr_reg_p->pr_reg_nacl, 2663 pr_reg_p->pr_res_mapped_lun, 2664 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2665 } 2666 spin_unlock(&pr_tmpl->registration_lock); 2667 2668 write_aptpl: 2669 if (pr_tmpl->pr_aptpl_active) 2670 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2671 2672 out_put_pr_reg: 2673 core_scsi3_put_pr_reg(pr_reg); 2674 return ret; 2675 } 2676 2677 static sense_reason_t 2678 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2679 { 2680 struct se_device *dev = cmd->se_dev; 2681 struct se_node_acl *pr_reg_nacl; 2682 struct se_session *se_sess = cmd->se_sess; 2683 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2684 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2685 u64 pr_res_mapped_lun = 0; 2686 int calling_it_nexus = 0; 2687 /* 2688 * Locate the existing *pr_reg via struct se_node_acl pointers 2689 */ 2690 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2691 se_sess->se_node_acl, se_sess); 2692 if (!pr_reg_n) { 2693 pr_err("SPC-3 PR: Unable to locate" 2694 " PR_REGISTERED *pr_reg for CLEAR\n"); 2695 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2696 } 2697 /* 2698 * From spc4r17 section 5.7.11.6, Clearing: 2699 * 2700 * Any application client may release the persistent reservation and 2701 * remove all registrations from a device server by issuing a 2702 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2703 * registered I_T nexus with the following parameter: 2704 * 2705 * a) RESERVATION KEY field set to the value of the reservation key 2706 * that is registered with the logical unit for the I_T nexus. 2707 */ 2708 if (res_key != pr_reg_n->pr_res_key) { 2709 pr_err("SPC-3 PR REGISTER: Received" 2710 " res_key: 0x%016Lx does not match" 2711 " existing SA REGISTER res_key:" 2712 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2713 core_scsi3_put_pr_reg(pr_reg_n); 2714 return TCM_RESERVATION_CONFLICT; 2715 } 2716 /* 2717 * a) Release the persistent reservation, if any; 2718 */ 2719 spin_lock(&dev->dev_reservation_lock); 2720 pr_res_holder = dev->dev_pr_res_holder; 2721 if (pr_res_holder) { 2722 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2723 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2724 pr_res_holder, 0, 0); 2725 } 2726 spin_unlock(&dev->dev_reservation_lock); 2727 /* 2728 * b) Remove all registration(s) (see spc4r17 5.7.7); 2729 */ 2730 spin_lock(&pr_tmpl->registration_lock); 2731 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2732 &pr_tmpl->registration_list, pr_reg_list) { 2733 2734 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2735 pr_reg_nacl = pr_reg->pr_reg_nacl; 2736 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2737 __core_scsi3_free_registration(dev, pr_reg, NULL, 2738 calling_it_nexus); 2739 /* 2740 * e) Establish a unit attention condition for the initiator 2741 * port associated with every registered I_T nexus other 2742 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2743 * command with CLEAR service action was received, with the 2744 * additional sense code set to RESERVATIONS PREEMPTED. 2745 */ 2746 if (!calling_it_nexus) 2747 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 2748 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2749 } 2750 spin_unlock(&pr_tmpl->registration_lock); 2751 2752 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2753 cmd->se_tfo->get_fabric_name()); 2754 2755 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2756 2757 core_scsi3_pr_generation(dev); 2758 return 0; 2759 } 2760 2761 /* 2762 * Called with struct se_device->dev_reservation_lock held. 2763 */ 2764 static void __core_scsi3_complete_pro_preempt( 2765 struct se_device *dev, 2766 struct t10_pr_registration *pr_reg, 2767 struct list_head *preempt_and_abort_list, 2768 int type, 2769 int scope, 2770 enum preempt_type preempt_type) 2771 { 2772 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2773 const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2774 char i_buf[PR_REG_ISID_ID_LEN]; 2775 2776 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2777 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2778 /* 2779 * Do an implicit RELEASE of the existing reservation. 2780 */ 2781 if (dev->dev_pr_res_holder) 2782 __core_scsi3_complete_pro_release(dev, nacl, 2783 dev->dev_pr_res_holder, 0, 0); 2784 2785 dev->dev_pr_res_holder = pr_reg; 2786 pr_reg->pr_res_holder = 1; 2787 pr_reg->pr_res_type = type; 2788 pr_reg->pr_res_scope = scope; 2789 2790 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2791 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2792 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2793 core_scsi3_pr_dump_type(type), 2794 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2795 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2796 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2797 nacl->initiatorname, i_buf); 2798 /* 2799 * For PREEMPT_AND_ABORT, add the preempting reservation's 2800 * struct t10_pr_registration to the list that will be compared 2801 * against received CDBs.. 2802 */ 2803 if (preempt_and_abort_list) 2804 list_add_tail(&pr_reg->pr_reg_abort_list, 2805 preempt_and_abort_list); 2806 } 2807 2808 static void core_scsi3_release_preempt_and_abort( 2809 struct list_head *preempt_and_abort_list, 2810 struct t10_pr_registration *pr_reg_holder) 2811 { 2812 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2813 2814 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2815 pr_reg_abort_list) { 2816 2817 list_del(&pr_reg->pr_reg_abort_list); 2818 if (pr_reg_holder == pr_reg) 2819 continue; 2820 if (pr_reg->pr_res_holder) { 2821 pr_warn("pr_reg->pr_res_holder still set\n"); 2822 continue; 2823 } 2824 2825 pr_reg->pr_reg_deve = NULL; 2826 pr_reg->pr_reg_nacl = NULL; 2827 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2828 } 2829 } 2830 2831 static sense_reason_t 2832 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2833 u64 sa_res_key, enum preempt_type preempt_type) 2834 { 2835 struct se_device *dev = cmd->se_dev; 2836 struct se_node_acl *pr_reg_nacl; 2837 struct se_session *se_sess = cmd->se_sess; 2838 LIST_HEAD(preempt_and_abort_list); 2839 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2840 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2841 u64 pr_res_mapped_lun = 0; 2842 int all_reg = 0, calling_it_nexus = 0; 2843 bool sa_res_key_unmatched = sa_res_key != 0; 2844 int prh_type = 0, prh_scope = 0; 2845 2846 if (!se_sess) 2847 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2848 2849 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2850 se_sess); 2851 if (!pr_reg_n) { 2852 pr_err("SPC-3 PR: Unable to locate" 2853 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2854 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2855 return TCM_RESERVATION_CONFLICT; 2856 } 2857 if (pr_reg_n->pr_res_key != res_key) { 2858 core_scsi3_put_pr_reg(pr_reg_n); 2859 return TCM_RESERVATION_CONFLICT; 2860 } 2861 if (scope != PR_SCOPE_LU_SCOPE) { 2862 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2863 core_scsi3_put_pr_reg(pr_reg_n); 2864 return TCM_INVALID_PARAMETER_LIST; 2865 } 2866 2867 spin_lock(&dev->dev_reservation_lock); 2868 pr_res_holder = dev->dev_pr_res_holder; 2869 if (pr_res_holder && 2870 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2871 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2872 all_reg = 1; 2873 2874 if (!all_reg && !sa_res_key) { 2875 spin_unlock(&dev->dev_reservation_lock); 2876 core_scsi3_put_pr_reg(pr_reg_n); 2877 return TCM_INVALID_PARAMETER_LIST; 2878 } 2879 /* 2880 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2881 * 2882 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2883 * persistent reservation holder or there is no persistent reservation 2884 * holder (i.e., there is no persistent reservation), then the device 2885 * server shall perform a preempt by doing the following in an 2886 * uninterrupted series of actions. (See below..) 2887 */ 2888 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2889 /* 2890 * No existing or SA Reservation Key matching reservations.. 2891 * 2892 * PROUT SA PREEMPT with All Registrant type reservations are 2893 * allowed to be processed without a matching SA Reservation Key 2894 */ 2895 spin_lock(&pr_tmpl->registration_lock); 2896 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2897 &pr_tmpl->registration_list, pr_reg_list) { 2898 /* 2899 * Removing of registrations in non all registrants 2900 * type reservations without a matching SA reservation 2901 * key. 2902 * 2903 * a) Remove the registrations for all I_T nexuses 2904 * specified by the SERVICE ACTION RESERVATION KEY 2905 * field; 2906 * b) Ignore the contents of the SCOPE and TYPE fields; 2907 * c) Process tasks as defined in 5.7.1; and 2908 * d) Establish a unit attention condition for the 2909 * initiator port associated with every I_T nexus 2910 * that lost its registration other than the I_T 2911 * nexus on which the PERSISTENT RESERVE OUT command 2912 * was received, with the additional sense code set 2913 * to REGISTRATIONS PREEMPTED. 2914 */ 2915 if (!all_reg) { 2916 if (pr_reg->pr_res_key != sa_res_key) 2917 continue; 2918 sa_res_key_unmatched = false; 2919 2920 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2921 pr_reg_nacl = pr_reg->pr_reg_nacl; 2922 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2923 __core_scsi3_free_registration(dev, pr_reg, 2924 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2925 NULL, calling_it_nexus); 2926 } else { 2927 /* 2928 * Case for any existing all registrants type 2929 * reservation, follow logic in spc4r17 section 2930 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2931 * 2932 * For a ZERO SA Reservation key, release 2933 * all other registrations and do an implicit 2934 * release of active persistent reservation. 2935 * 2936 * For a non-ZERO SA Reservation key, only 2937 * release the matching reservation key from 2938 * registrations. 2939 */ 2940 if ((sa_res_key) && 2941 (pr_reg->pr_res_key != sa_res_key)) 2942 continue; 2943 sa_res_key_unmatched = false; 2944 2945 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2946 if (calling_it_nexus) 2947 continue; 2948 2949 pr_reg_nacl = pr_reg->pr_reg_nacl; 2950 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2951 __core_scsi3_free_registration(dev, pr_reg, 2952 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2953 NULL, 0); 2954 } 2955 if (!calling_it_nexus) 2956 target_ua_allocate_lun(pr_reg_nacl, 2957 pr_res_mapped_lun, 0x2A, 2958 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2959 } 2960 spin_unlock(&pr_tmpl->registration_lock); 2961 /* 2962 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2963 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2964 * RESERVATION KEY field to a value that does not match any 2965 * registered reservation key, then the device server shall 2966 * complete the command with RESERVATION CONFLICT status. 2967 */ 2968 if (sa_res_key_unmatched) { 2969 spin_unlock(&dev->dev_reservation_lock); 2970 core_scsi3_put_pr_reg(pr_reg_n); 2971 return TCM_RESERVATION_CONFLICT; 2972 } 2973 /* 2974 * For an existing all registrants type reservation 2975 * with a zero SA rservation key, preempt the existing 2976 * reservation with the new PR type and scope. 2977 */ 2978 if (pr_res_holder && all_reg && !(sa_res_key)) { 2979 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2980 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2981 type, scope, preempt_type); 2982 2983 if (preempt_type == PREEMPT_AND_ABORT) 2984 core_scsi3_release_preempt_and_abort( 2985 &preempt_and_abort_list, pr_reg_n); 2986 } 2987 spin_unlock(&dev->dev_reservation_lock); 2988 2989 if (pr_tmpl->pr_aptpl_active) 2990 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2991 2992 core_scsi3_put_pr_reg(pr_reg_n); 2993 core_scsi3_pr_generation(cmd->se_dev); 2994 return 0; 2995 } 2996 /* 2997 * The PREEMPTing SA reservation key matches that of the 2998 * existing persistent reservation, first, we check if 2999 * we are preempting our own reservation. 3000 * From spc4r17, section 5.7.11.4.3 Preempting 3001 * persistent reservations and registration handling 3002 * 3003 * If an all registrants persistent reservation is not 3004 * present, it is not an error for the persistent 3005 * reservation holder to preempt itself (i.e., a 3006 * PERSISTENT RESERVE OUT with a PREEMPT service action 3007 * or a PREEMPT AND ABORT service action with the 3008 * SERVICE ACTION RESERVATION KEY value equal to the 3009 * persistent reservation holder's reservation key that 3010 * is received from the persistent reservation holder). 3011 * In that case, the device server shall establish the 3012 * new persistent reservation and maintain the 3013 * registration. 3014 */ 3015 prh_type = pr_res_holder->pr_res_type; 3016 prh_scope = pr_res_holder->pr_res_scope; 3017 /* 3018 * If the SERVICE ACTION RESERVATION KEY field identifies a 3019 * persistent reservation holder (see 5.7.10), the device 3020 * server shall perform a preempt by doing the following as 3021 * an uninterrupted series of actions: 3022 * 3023 * a) Release the persistent reservation for the holder 3024 * identified by the SERVICE ACTION RESERVATION KEY field; 3025 */ 3026 if (pr_reg_n != pr_res_holder) 3027 __core_scsi3_complete_pro_release(dev, 3028 pr_res_holder->pr_reg_nacl, 3029 dev->dev_pr_res_holder, 0, 0); 3030 /* 3031 * b) Remove the registrations for all I_T nexuses identified 3032 * by the SERVICE ACTION RESERVATION KEY field, except the 3033 * I_T nexus that is being used for the PERSISTENT RESERVE 3034 * OUT command. If an all registrants persistent reservation 3035 * is present and the SERVICE ACTION RESERVATION KEY field 3036 * is set to zero, then all registrations shall be removed 3037 * except for that of the I_T nexus that is being used for 3038 * the PERSISTENT RESERVE OUT command; 3039 */ 3040 spin_lock(&pr_tmpl->registration_lock); 3041 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3042 &pr_tmpl->registration_list, pr_reg_list) { 3043 3044 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3045 if (calling_it_nexus) 3046 continue; 3047 3048 if (pr_reg->pr_res_key != sa_res_key) 3049 continue; 3050 3051 pr_reg_nacl = pr_reg->pr_reg_nacl; 3052 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3053 __core_scsi3_free_registration(dev, pr_reg, 3054 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3055 calling_it_nexus); 3056 /* 3057 * e) Establish a unit attention condition for the initiator 3058 * port associated with every I_T nexus that lost its 3059 * persistent reservation and/or registration, with the 3060 * additional sense code set to REGISTRATIONS PREEMPTED; 3061 */ 3062 target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3063 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3064 } 3065 spin_unlock(&pr_tmpl->registration_lock); 3066 /* 3067 * c) Establish a persistent reservation for the preempting 3068 * I_T nexus using the contents of the SCOPE and TYPE fields; 3069 */ 3070 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3071 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3072 type, scope, preempt_type); 3073 /* 3074 * d) Process tasks as defined in 5.7.1; 3075 * e) See above.. 3076 * f) If the type or scope has changed, then for every I_T nexus 3077 * whose reservation key was not removed, except for the I_T 3078 * nexus on which the PERSISTENT RESERVE OUT command was 3079 * received, the device server shall establish a unit 3080 * attention condition for the initiator port associated with 3081 * that I_T nexus, with the additional sense code set to 3082 * RESERVATIONS RELEASED. If the type or scope have not 3083 * changed, then no unit attention condition(s) shall be 3084 * established for this reason. 3085 */ 3086 if ((prh_type != type) || (prh_scope != scope)) { 3087 spin_lock(&pr_tmpl->registration_lock); 3088 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3089 &pr_tmpl->registration_list, pr_reg_list) { 3090 3091 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3092 if (calling_it_nexus) 3093 continue; 3094 3095 target_ua_allocate_lun(pr_reg->pr_reg_nacl, 3096 pr_reg->pr_res_mapped_lun, 0x2A, 3097 ASCQ_2AH_RESERVATIONS_RELEASED); 3098 } 3099 spin_unlock(&pr_tmpl->registration_lock); 3100 } 3101 spin_unlock(&dev->dev_reservation_lock); 3102 /* 3103 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3104 * All received CDBs for the matching existing reservation and 3105 * registrations undergo ABORT_TASK logic. 3106 * 3107 * From there, core_scsi3_release_preempt_and_abort() will 3108 * release every registration in the list (which have already 3109 * been removed from the primary pr_reg list), except the 3110 * new persistent reservation holder, the calling Initiator Port. 3111 */ 3112 if (preempt_type == PREEMPT_AND_ABORT) { 3113 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3114 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3115 pr_reg_n); 3116 } 3117 3118 if (pr_tmpl->pr_aptpl_active) 3119 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3120 3121 core_scsi3_put_pr_reg(pr_reg_n); 3122 core_scsi3_pr_generation(cmd->se_dev); 3123 return 0; 3124 } 3125 3126 static sense_reason_t 3127 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3128 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3129 { 3130 switch (type) { 3131 case PR_TYPE_WRITE_EXCLUSIVE: 3132 case PR_TYPE_EXCLUSIVE_ACCESS: 3133 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3134 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3135 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3136 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3137 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3138 sa_res_key, preempt_type); 3139 default: 3140 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3141 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3142 return TCM_INVALID_CDB_FIELD; 3143 } 3144 } 3145 3146 3147 static sense_reason_t 3148 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3149 u64 sa_res_key, int aptpl, int unreg) 3150 { 3151 struct se_session *se_sess = cmd->se_sess; 3152 struct se_device *dev = cmd->se_dev; 3153 struct se_dev_entry *dest_se_deve = NULL; 3154 struct se_lun *se_lun = cmd->se_lun, *tmp_lun; 3155 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3156 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3157 const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3158 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3159 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3160 unsigned char *buf; 3161 const unsigned char *initiator_str; 3162 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3163 u32 tid_len, tmp_tid_len; 3164 int new_reg = 0, type, scope, matching_iname; 3165 sense_reason_t ret; 3166 unsigned short rtpi; 3167 unsigned char proto_ident; 3168 3169 if (!se_sess || !se_lun) { 3170 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3171 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3172 } 3173 3174 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3175 se_tpg = se_sess->se_tpg; 3176 tf_ops = se_tpg->se_tpg_tfo; 3177 /* 3178 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3179 * Register behaviors for a REGISTER AND MOVE service action 3180 * 3181 * Locate the existing *pr_reg via struct se_node_acl pointers 3182 */ 3183 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3184 se_sess); 3185 if (!pr_reg) { 3186 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3187 " *pr_reg for REGISTER_AND_MOVE\n"); 3188 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3189 } 3190 /* 3191 * The provided reservation key much match the existing reservation key 3192 * provided during this initiator's I_T nexus registration. 3193 */ 3194 if (res_key != pr_reg->pr_res_key) { 3195 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3196 " res_key: 0x%016Lx does not match existing SA REGISTER" 3197 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3198 ret = TCM_RESERVATION_CONFLICT; 3199 goto out_put_pr_reg; 3200 } 3201 /* 3202 * The service active reservation key needs to be non zero 3203 */ 3204 if (!sa_res_key) { 3205 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3206 " sa_res_key\n"); 3207 ret = TCM_INVALID_PARAMETER_LIST; 3208 goto out_put_pr_reg; 3209 } 3210 3211 /* 3212 * Determine the Relative Target Port Identifier where the reservation 3213 * will be moved to for the TransportID containing SCSI initiator WWN 3214 * information. 3215 */ 3216 buf = transport_kmap_data_sg(cmd); 3217 if (!buf) { 3218 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3219 goto out_put_pr_reg; 3220 } 3221 3222 rtpi = get_unaligned_be16(&buf[18]); 3223 tid_len = get_unaligned_be32(&buf[20]); 3224 transport_kunmap_data_sg(cmd); 3225 buf = NULL; 3226 3227 if ((tid_len + 24) != cmd->data_length) { 3228 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3229 " does not equal CDB data_length: %u\n", tid_len, 3230 cmd->data_length); 3231 ret = TCM_INVALID_PARAMETER_LIST; 3232 goto out_put_pr_reg; 3233 } 3234 3235 spin_lock(&dev->se_port_lock); 3236 list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) { 3237 if (tmp_lun->lun_rtpi != rtpi) 3238 continue; 3239 dest_se_tpg = tmp_lun->lun_tpg; 3240 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3241 if (!dest_tf_ops) 3242 continue; 3243 3244 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3245 spin_unlock(&dev->se_port_lock); 3246 3247 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3248 pr_err("core_scsi3_tpg_depend_item() failed" 3249 " for dest_se_tpg\n"); 3250 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3251 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3252 goto out_put_pr_reg; 3253 } 3254 3255 spin_lock(&dev->se_port_lock); 3256 break; 3257 } 3258 spin_unlock(&dev->se_port_lock); 3259 3260 if (!dest_se_tpg || !dest_tf_ops) { 3261 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3262 " fabric ops from Relative Target Port Identifier:" 3263 " %hu\n", rtpi); 3264 ret = TCM_INVALID_PARAMETER_LIST; 3265 goto out_put_pr_reg; 3266 } 3267 3268 buf = transport_kmap_data_sg(cmd); 3269 if (!buf) { 3270 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3271 goto out_put_pr_reg; 3272 } 3273 proto_ident = (buf[24] & 0x0f); 3274 3275 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3276 " 0x%02x\n", proto_ident); 3277 3278 if (proto_ident != dest_se_tpg->proto_id) { 3279 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3280 " proto_ident: 0x%02x does not match ident: 0x%02x" 3281 " from fabric: %s\n", proto_ident, 3282 dest_se_tpg->proto_id, 3283 dest_tf_ops->get_fabric_name()); 3284 ret = TCM_INVALID_PARAMETER_LIST; 3285 goto out; 3286 } 3287 initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, 3288 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3289 if (!initiator_str) { 3290 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3291 " initiator_str from Transport ID\n"); 3292 ret = TCM_INVALID_PARAMETER_LIST; 3293 goto out; 3294 } 3295 3296 transport_kunmap_data_sg(cmd); 3297 buf = NULL; 3298 3299 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3300 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3301 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3302 iport_ptr : ""); 3303 /* 3304 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3305 * action specifies a TransportID that is the same as the initiator port 3306 * of the I_T nexus for the command received, then the command shall 3307 * be terminated with CHECK CONDITION status, with the sense key set to 3308 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3309 * IN PARAMETER LIST. 3310 */ 3311 pr_reg_nacl = pr_reg->pr_reg_nacl; 3312 matching_iname = (!strcmp(initiator_str, 3313 pr_reg_nacl->initiatorname)) ? 1 : 0; 3314 if (!matching_iname) 3315 goto after_iport_check; 3316 3317 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3318 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3319 " matches: %s on received I_T Nexus\n", initiator_str, 3320 pr_reg_nacl->initiatorname); 3321 ret = TCM_INVALID_PARAMETER_LIST; 3322 goto out; 3323 } 3324 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3325 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3326 " matches: %s %s on received I_T Nexus\n", 3327 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3328 pr_reg->pr_reg_isid); 3329 ret = TCM_INVALID_PARAMETER_LIST; 3330 goto out; 3331 } 3332 after_iport_check: 3333 /* 3334 * Locate the destination struct se_node_acl from the received Transport ID 3335 */ 3336 mutex_lock(&dest_se_tpg->acl_node_mutex); 3337 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3338 initiator_str); 3339 if (dest_node_acl) 3340 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3341 mutex_unlock(&dest_se_tpg->acl_node_mutex); 3342 3343 if (!dest_node_acl) { 3344 pr_err("Unable to locate %s dest_node_acl for" 3345 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3346 initiator_str); 3347 ret = TCM_INVALID_PARAMETER_LIST; 3348 goto out; 3349 } 3350 3351 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3352 pr_err("core_scsi3_nodeacl_depend_item() for" 3353 " dest_node_acl\n"); 3354 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3355 dest_node_acl = NULL; 3356 ret = TCM_INVALID_PARAMETER_LIST; 3357 goto out; 3358 } 3359 3360 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3361 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3362 dest_node_acl->initiatorname); 3363 3364 /* 3365 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3366 * PORT IDENTIFIER. 3367 */ 3368 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3369 if (!dest_se_deve) { 3370 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3371 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3372 ret = TCM_INVALID_PARAMETER_LIST; 3373 goto out; 3374 } 3375 3376 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3377 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3378 kref_put(&dest_se_deve->pr_kref, target_pr_kref_release); 3379 dest_se_deve = NULL; 3380 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3381 goto out; 3382 } 3383 3384 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3385 " ACL for dest_se_deve->mapped_lun: %llu\n", 3386 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3387 dest_se_deve->mapped_lun); 3388 3389 /* 3390 * A persistent reservation needs to already existing in order to 3391 * successfully complete the REGISTER_AND_MOVE service action.. 3392 */ 3393 spin_lock(&dev->dev_reservation_lock); 3394 pr_res_holder = dev->dev_pr_res_holder; 3395 if (!pr_res_holder) { 3396 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3397 " currently held\n"); 3398 spin_unlock(&dev->dev_reservation_lock); 3399 ret = TCM_INVALID_CDB_FIELD; 3400 goto out; 3401 } 3402 /* 3403 * The received on I_T Nexus must be the reservation holder. 3404 * 3405 * From spc4r17 section 5.7.8 Table 50 -- 3406 * Register behaviors for a REGISTER AND MOVE service action 3407 */ 3408 if (!is_reservation_holder(pr_res_holder, pr_reg)) { 3409 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3410 " Nexus is not reservation holder\n"); 3411 spin_unlock(&dev->dev_reservation_lock); 3412 ret = TCM_RESERVATION_CONFLICT; 3413 goto out; 3414 } 3415 /* 3416 * From spc4r17 section 5.7.8: registering and moving reservation 3417 * 3418 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3419 * action is received and the established persistent reservation is a 3420 * Write Exclusive - All Registrants type or Exclusive Access - 3421 * All Registrants type reservation, then the command shall be completed 3422 * with RESERVATION CONFLICT status. 3423 */ 3424 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3425 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3426 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3427 " reservation for type: %s\n", 3428 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3429 spin_unlock(&dev->dev_reservation_lock); 3430 ret = TCM_RESERVATION_CONFLICT; 3431 goto out; 3432 } 3433 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3434 /* 3435 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3436 */ 3437 type = pr_res_holder->pr_res_type; 3438 scope = pr_res_holder->pr_res_type; 3439 /* 3440 * c) Associate the reservation key specified in the SERVICE ACTION 3441 * RESERVATION KEY field with the I_T nexus specified as the 3442 * destination of the register and move, where: 3443 * A) The I_T nexus is specified by the TransportID and the 3444 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3445 * B) Regardless of the TransportID format used, the association for 3446 * the initiator port is based on either the initiator port name 3447 * (see 3.1.71) on SCSI transport protocols where port names are 3448 * required or the initiator port identifier (see 3.1.70) on SCSI 3449 * transport protocols where port names are not required; 3450 * d) Register the reservation key specified in the SERVICE ACTION 3451 * RESERVATION KEY field; 3452 * e) Retain the reservation key specified in the SERVICE ACTION 3453 * RESERVATION KEY field and associated information; 3454 * 3455 * Also, It is not an error for a REGISTER AND MOVE service action to 3456 * register an I_T nexus that is already registered with the same 3457 * reservation key or a different reservation key. 3458 */ 3459 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3460 iport_ptr); 3461 if (!dest_pr_reg) { 3462 struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun, 3463 kref_read(&dest_se_deve->pr_kref) != 0); 3464 3465 spin_unlock(&dev->dev_reservation_lock); 3466 if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl, 3467 dest_lun, dest_se_deve, dest_se_deve->mapped_lun, 3468 iport_ptr, sa_res_key, 0, aptpl, 2, 1)) { 3469 ret = TCM_INVALID_PARAMETER_LIST; 3470 goto out; 3471 } 3472 spin_lock(&dev->dev_reservation_lock); 3473 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3474 iport_ptr); 3475 new_reg = 1; 3476 } 3477 /* 3478 * f) Release the persistent reservation for the persistent reservation 3479 * holder (i.e., the I_T nexus on which the 3480 */ 3481 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3482 dev->dev_pr_res_holder, 0, 0); 3483 /* 3484 * g) Move the persistent reservation to the specified I_T nexus using 3485 * the same scope and type as the persistent reservation released in 3486 * item f); and 3487 */ 3488 dev->dev_pr_res_holder = dest_pr_reg; 3489 dest_pr_reg->pr_res_holder = 1; 3490 dest_pr_reg->pr_res_type = type; 3491 pr_reg->pr_res_scope = scope; 3492 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3493 /* 3494 * Increment PRGeneration for existing registrations.. 3495 */ 3496 if (!new_reg) 3497 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3498 spin_unlock(&dev->dev_reservation_lock); 3499 3500 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3501 " created new reservation holder TYPE: %s on object RTPI:" 3502 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3503 core_scsi3_pr_dump_type(type), rtpi, 3504 dest_pr_reg->pr_res_generation); 3505 pr_debug("SPC-3 PR Successfully moved reservation from" 3506 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3507 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3508 i_buf, dest_tf_ops->get_fabric_name(), 3509 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3510 iport_ptr : ""); 3511 /* 3512 * It is now safe to release configfs group dependencies for destination 3513 * of Transport ID Initiator Device/Port Identifier 3514 */ 3515 core_scsi3_lunacl_undepend_item(dest_se_deve); 3516 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3517 core_scsi3_tpg_undepend_item(dest_se_tpg); 3518 /* 3519 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3520 * nexus on which PERSISTENT RESERVE OUT command was received. 3521 */ 3522 if (unreg) { 3523 spin_lock(&pr_tmpl->registration_lock); 3524 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3525 spin_unlock(&pr_tmpl->registration_lock); 3526 } else 3527 core_scsi3_put_pr_reg(pr_reg); 3528 3529 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3530 3531 transport_kunmap_data_sg(cmd); 3532 3533 core_scsi3_put_pr_reg(dest_pr_reg); 3534 return 0; 3535 out: 3536 if (buf) 3537 transport_kunmap_data_sg(cmd); 3538 if (dest_se_deve) 3539 core_scsi3_lunacl_undepend_item(dest_se_deve); 3540 if (dest_node_acl) 3541 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3542 core_scsi3_tpg_undepend_item(dest_se_tpg); 3543 3544 out_put_pr_reg: 3545 core_scsi3_put_pr_reg(pr_reg); 3546 return ret; 3547 } 3548 3549 /* 3550 * See spc4r17 section 6.14 Table 170 3551 */ 3552 sense_reason_t 3553 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3554 { 3555 struct se_device *dev = cmd->se_dev; 3556 unsigned char *cdb = &cmd->t_task_cdb[0]; 3557 unsigned char *buf; 3558 u64 res_key, sa_res_key; 3559 int sa, scope, type, aptpl; 3560 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3561 sense_reason_t ret; 3562 3563 /* 3564 * Following spc2r20 5.5.1 Reservations overview: 3565 * 3566 * If a logical unit has been reserved by any RESERVE command and is 3567 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3568 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3569 * initiator or service action and shall terminate with a RESERVATION 3570 * CONFLICT status. 3571 */ 3572 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3573 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3574 " SPC-2 reservation is held, returning" 3575 " RESERVATION_CONFLICT\n"); 3576 return TCM_RESERVATION_CONFLICT; 3577 } 3578 3579 /* 3580 * FIXME: A NULL struct se_session pointer means an this is not coming from 3581 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3582 */ 3583 if (!cmd->se_sess) 3584 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3585 3586 if (cmd->data_length < 24) { 3587 pr_warn("SPC-PR: Received PR OUT parameter list" 3588 " length too small: %u\n", cmd->data_length); 3589 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3590 } 3591 3592 /* 3593 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3594 */ 3595 sa = (cdb[1] & 0x1f); 3596 scope = (cdb[2] & 0xf0); 3597 type = (cdb[2] & 0x0f); 3598 3599 buf = transport_kmap_data_sg(cmd); 3600 if (!buf) 3601 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3602 3603 /* 3604 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3605 */ 3606 res_key = get_unaligned_be64(&buf[0]); 3607 sa_res_key = get_unaligned_be64(&buf[8]); 3608 /* 3609 * REGISTER_AND_MOVE uses a different SA parameter list containing 3610 * SCSI TransportIDs. 3611 */ 3612 if (sa != PRO_REGISTER_AND_MOVE) { 3613 spec_i_pt = (buf[20] & 0x08); 3614 all_tg_pt = (buf[20] & 0x04); 3615 aptpl = (buf[20] & 0x01); 3616 } else { 3617 aptpl = (buf[17] & 0x01); 3618 unreg = (buf[17] & 0x02); 3619 } 3620 /* 3621 * If the backend device has been configured to force APTPL metadata 3622 * write-out, go ahead and propigate aptpl=1 down now. 3623 */ 3624 if (dev->dev_attrib.force_pr_aptpl) 3625 aptpl = 1; 3626 3627 transport_kunmap_data_sg(cmd); 3628 buf = NULL; 3629 3630 /* 3631 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3632 */ 3633 if (spec_i_pt && (sa != PRO_REGISTER)) 3634 return TCM_INVALID_PARAMETER_LIST; 3635 3636 /* 3637 * From spc4r17 section 6.14: 3638 * 3639 * If the SPEC_I_PT bit is set to zero, the service action is not 3640 * REGISTER AND MOVE, and the parameter list length is not 24, then 3641 * the command shall be terminated with CHECK CONDITION status, with 3642 * the sense key set to ILLEGAL REQUEST, and the additional sense 3643 * code set to PARAMETER LIST LENGTH ERROR. 3644 */ 3645 if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) && 3646 (cmd->data_length != 24)) { 3647 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3648 " list length: %u\n", cmd->data_length); 3649 return TCM_PARAMETER_LIST_LENGTH_ERROR; 3650 } 3651 3652 /* 3653 * (core_scsi3_emulate_pro_* function parameters 3654 * are defined by spc4r17 Table 174: 3655 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3656 */ 3657 switch (sa) { 3658 case PRO_REGISTER: 3659 ret = core_scsi3_emulate_pro_register(cmd, 3660 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3661 break; 3662 case PRO_RESERVE: 3663 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3664 break; 3665 case PRO_RELEASE: 3666 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3667 break; 3668 case PRO_CLEAR: 3669 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3670 break; 3671 case PRO_PREEMPT: 3672 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3673 res_key, sa_res_key, PREEMPT); 3674 break; 3675 case PRO_PREEMPT_AND_ABORT: 3676 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3677 res_key, sa_res_key, PREEMPT_AND_ABORT); 3678 break; 3679 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3680 ret = core_scsi3_emulate_pro_register(cmd, 3681 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3682 break; 3683 case PRO_REGISTER_AND_MOVE: 3684 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3685 sa_res_key, aptpl, unreg); 3686 break; 3687 default: 3688 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3689 " action: 0x%02x\n", sa); 3690 return TCM_INVALID_CDB_FIELD; 3691 } 3692 3693 if (!ret) 3694 target_complete_cmd(cmd, GOOD); 3695 return ret; 3696 } 3697 3698 /* 3699 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3700 * 3701 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3702 */ 3703 static sense_reason_t 3704 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3705 { 3706 struct se_device *dev = cmd->se_dev; 3707 struct t10_pr_registration *pr_reg; 3708 unsigned char *buf; 3709 u32 add_len = 0, off = 8; 3710 3711 if (cmd->data_length < 8) { 3712 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3713 " too small\n", cmd->data_length); 3714 return TCM_INVALID_CDB_FIELD; 3715 } 3716 3717 buf = transport_kmap_data_sg(cmd); 3718 if (!buf) 3719 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3720 3721 put_unaligned_be32(dev->t10_pr.pr_generation, buf); 3722 3723 spin_lock(&dev->t10_pr.registration_lock); 3724 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3725 pr_reg_list) { 3726 /* 3727 * Check for overflow of 8byte PRI READ_KEYS payload and 3728 * next reservation key list descriptor. 3729 */ 3730 if ((add_len + 8) > (cmd->data_length - 8)) 3731 break; 3732 3733 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3734 off += 8; 3735 add_len += 8; 3736 } 3737 spin_unlock(&dev->t10_pr.registration_lock); 3738 3739 put_unaligned_be32(add_len, &buf[4]); 3740 3741 transport_kunmap_data_sg(cmd); 3742 3743 return 0; 3744 } 3745 3746 /* 3747 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3748 * 3749 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3750 */ 3751 static sense_reason_t 3752 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3753 { 3754 struct se_device *dev = cmd->se_dev; 3755 struct t10_pr_registration *pr_reg; 3756 unsigned char *buf; 3757 u64 pr_res_key; 3758 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3759 3760 if (cmd->data_length < 8) { 3761 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3762 " too small\n", cmd->data_length); 3763 return TCM_INVALID_CDB_FIELD; 3764 } 3765 3766 buf = transport_kmap_data_sg(cmd); 3767 if (!buf) 3768 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3769 3770 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3771 3772 spin_lock(&dev->dev_reservation_lock); 3773 pr_reg = dev->dev_pr_res_holder; 3774 if (pr_reg) { 3775 /* 3776 * Set the hardcoded Additional Length 3777 */ 3778 put_unaligned_be32(add_len, &buf[4]); 3779 3780 if (cmd->data_length < 22) 3781 goto err; 3782 3783 /* 3784 * Set the Reservation key. 3785 * 3786 * From spc4r17, section 5.7.10: 3787 * A persistent reservation holder has its reservation key 3788 * returned in the parameter data from a PERSISTENT 3789 * RESERVE IN command with READ RESERVATION service action as 3790 * follows: 3791 * a) For a persistent reservation of the type Write Exclusive 3792 * - All Registrants or Exclusive Access All Regitrants, 3793 * the reservation key shall be set to zero; or 3794 * b) For all other persistent reservation types, the 3795 * reservation key shall be set to the registered 3796 * reservation key for the I_T nexus that holds the 3797 * persistent reservation. 3798 */ 3799 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3800 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3801 pr_res_key = 0; 3802 else 3803 pr_res_key = pr_reg->pr_res_key; 3804 3805 put_unaligned_be64(pr_res_key, &buf[8]); 3806 /* 3807 * Set the SCOPE and TYPE 3808 */ 3809 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3810 (pr_reg->pr_res_type & 0x0f); 3811 } 3812 3813 err: 3814 spin_unlock(&dev->dev_reservation_lock); 3815 transport_kunmap_data_sg(cmd); 3816 3817 return 0; 3818 } 3819 3820 /* 3821 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3822 * 3823 * See spc4r17 section 6.13.4 Table 165 3824 */ 3825 static sense_reason_t 3826 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3827 { 3828 struct se_device *dev = cmd->se_dev; 3829 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3830 unsigned char *buf; 3831 u16 add_len = 8; /* Hardcoded to 8. */ 3832 3833 if (cmd->data_length < 6) { 3834 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3835 " %u too small\n", cmd->data_length); 3836 return TCM_INVALID_CDB_FIELD; 3837 } 3838 3839 buf = transport_kmap_data_sg(cmd); 3840 if (!buf) 3841 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3842 3843 put_unaligned_be16(add_len, &buf[0]); 3844 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3845 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3846 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3847 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3848 /* 3849 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3850 * set the TMV: Task Mask Valid bit. 3851 */ 3852 buf[3] |= 0x80; 3853 /* 3854 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3855 */ 3856 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3857 /* 3858 * PTPL_A: Persistence across Target Power Loss Active bit 3859 */ 3860 if (pr_tmpl->pr_aptpl_active) 3861 buf[3] |= 0x01; 3862 /* 3863 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3864 */ 3865 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3866 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3867 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3868 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3869 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3870 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3871 3872 transport_kunmap_data_sg(cmd); 3873 3874 return 0; 3875 } 3876 3877 /* 3878 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3879 * 3880 * See spc4r17 section 6.13.5 Table 168 and 169 3881 */ 3882 static sense_reason_t 3883 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3884 { 3885 struct se_device *dev = cmd->se_dev; 3886 struct se_node_acl *se_nacl; 3887 struct se_portal_group *se_tpg; 3888 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3889 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3890 unsigned char *buf; 3891 u32 add_desc_len = 0, add_len = 0; 3892 u32 off = 8; /* off into first Full Status descriptor */ 3893 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3894 int exp_desc_len, desc_len; 3895 bool all_reg = false; 3896 3897 if (cmd->data_length < 8) { 3898 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3899 " too small\n", cmd->data_length); 3900 return TCM_INVALID_CDB_FIELD; 3901 } 3902 3903 buf = transport_kmap_data_sg(cmd); 3904 if (!buf) 3905 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3906 3907 put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]); 3908 3909 spin_lock(&dev->dev_reservation_lock); 3910 if (dev->dev_pr_res_holder) { 3911 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3912 3913 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3914 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3915 all_reg = true; 3916 pr_res_type = pr_holder->pr_res_type; 3917 pr_res_scope = pr_holder->pr_res_scope; 3918 } 3919 } 3920 spin_unlock(&dev->dev_reservation_lock); 3921 3922 spin_lock(&pr_tmpl->registration_lock); 3923 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3924 &pr_tmpl->registration_list, pr_reg_list) { 3925 3926 se_nacl = pr_reg->pr_reg_nacl; 3927 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3928 add_desc_len = 0; 3929 3930 atomic_inc_mb(&pr_reg->pr_res_holders); 3931 spin_unlock(&pr_tmpl->registration_lock); 3932 /* 3933 * Determine expected length of $FABRIC_MOD specific 3934 * TransportID full status descriptor.. 3935 */ 3936 exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg, 3937 &format_code); 3938 if (exp_desc_len < 0 || 3939 exp_desc_len + add_len > cmd->data_length) { 3940 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3941 " out of buffer: %d\n", cmd->data_length); 3942 spin_lock(&pr_tmpl->registration_lock); 3943 atomic_dec_mb(&pr_reg->pr_res_holders); 3944 break; 3945 } 3946 /* 3947 * Set RESERVATION KEY 3948 */ 3949 put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); 3950 off += 8; 3951 off += 4; /* Skip Over Reserved area */ 3952 3953 /* 3954 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3955 */ 3956 if (pr_reg->pr_reg_all_tg_pt) 3957 buf[off] = 0x02; 3958 /* 3959 * The struct se_lun pointer will be present for the 3960 * reservation holder for PR_HOLDER bit. 3961 * 3962 * Also, if this registration is the reservation 3963 * holder or there is an All Registrants reservation 3964 * active, fill in SCOPE and TYPE in the next byte. 3965 */ 3966 if (pr_reg->pr_res_holder) { 3967 buf[off++] |= 0x01; 3968 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3969 (pr_reg->pr_res_type & 0x0f); 3970 } else if (all_reg) { 3971 buf[off++] |= 0x01; 3972 buf[off++] = (pr_res_scope & 0xf0) | 3973 (pr_res_type & 0x0f); 3974 } else { 3975 off += 2; 3976 } 3977 3978 off += 4; /* Skip over reserved area */ 3979 /* 3980 * From spc4r17 6.3.15: 3981 * 3982 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3983 * IDENTIFIER field contains the relative port identifier (see 3984 * 3.1.120) of the target port that is part of the I_T nexus 3985 * described by this full status descriptor. If the ALL_TG_PT 3986 * bit is set to one, the contents of the RELATIVE TARGET PORT 3987 * IDENTIFIER field are not defined by this standard. 3988 */ 3989 if (!pr_reg->pr_reg_all_tg_pt) { 3990 u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi; 3991 3992 put_unaligned_be16(sep_rtpi, &buf[off]); 3993 off += 2; 3994 } else 3995 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 3996 3997 buf[off+4] = se_tpg->proto_id; 3998 3999 /* 4000 * Now, have the $FABRIC_MOD fill in the transport ID. 4001 */ 4002 desc_len = target_get_pr_transport_id(se_nacl, pr_reg, 4003 &format_code, &buf[off+4]); 4004 4005 spin_lock(&pr_tmpl->registration_lock); 4006 atomic_dec_mb(&pr_reg->pr_res_holders); 4007 4008 if (desc_len < 0) 4009 break; 4010 /* 4011 * Set the ADDITIONAL DESCRIPTOR LENGTH 4012 */ 4013 put_unaligned_be32(desc_len, &buf[off]); 4014 /* 4015 * Size of full desctipor header minus TransportID 4016 * containing $FABRIC_MOD specific) initiator device/port 4017 * WWN information. 4018 * 4019 * See spc4r17 Section 6.13.5 Table 169 4020 */ 4021 add_desc_len = (24 + desc_len); 4022 4023 off += desc_len; 4024 add_len += add_desc_len; 4025 } 4026 spin_unlock(&pr_tmpl->registration_lock); 4027 /* 4028 * Set ADDITIONAL_LENGTH 4029 */ 4030 put_unaligned_be32(add_len, &buf[4]); 4031 4032 transport_kunmap_data_sg(cmd); 4033 4034 return 0; 4035 } 4036 4037 sense_reason_t 4038 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4039 { 4040 sense_reason_t ret; 4041 4042 /* 4043 * Following spc2r20 5.5.1 Reservations overview: 4044 * 4045 * If a logical unit has been reserved by any RESERVE command and is 4046 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4047 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4048 * initiator or service action and shall terminate with a RESERVATION 4049 * CONFLICT status. 4050 */ 4051 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4052 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4053 " SPC-2 reservation is held, returning" 4054 " RESERVATION_CONFLICT\n"); 4055 return TCM_RESERVATION_CONFLICT; 4056 } 4057 4058 switch (cmd->t_task_cdb[1] & 0x1f) { 4059 case PRI_READ_KEYS: 4060 ret = core_scsi3_pri_read_keys(cmd); 4061 break; 4062 case PRI_READ_RESERVATION: 4063 ret = core_scsi3_pri_read_reservation(cmd); 4064 break; 4065 case PRI_REPORT_CAPABILITIES: 4066 ret = core_scsi3_pri_report_capabilities(cmd); 4067 break; 4068 case PRI_READ_FULL_STATUS: 4069 ret = core_scsi3_pri_read_full_status(cmd); 4070 break; 4071 default: 4072 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4073 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4074 return TCM_INVALID_CDB_FIELD; 4075 } 4076 4077 if (!ret) 4078 target_complete_cmd(cmd, GOOD); 4079 return ret; 4080 } 4081 4082 sense_reason_t 4083 target_check_reservation(struct se_cmd *cmd) 4084 { 4085 struct se_device *dev = cmd->se_dev; 4086 sense_reason_t ret; 4087 4088 if (!cmd->se_sess) 4089 return 0; 4090 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4091 return 0; 4092 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) 4093 return 0; 4094 4095 spin_lock(&dev->dev_reservation_lock); 4096 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4097 ret = target_scsi2_reservation_check(cmd); 4098 else 4099 ret = target_scsi3_pr_reservation_check(cmd); 4100 spin_unlock(&dev->dev_reservation_lock); 4101 4102 return ret; 4103 } 4104