1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/list.h> 30 #include <linux/file.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 #include <target/target_core_configfs.h> 39 40 #include "target_core_internal.h" 41 #include "target_core_pr.h" 42 #include "target_core_ua.h" 43 44 /* 45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 46 */ 47 struct pr_transport_id_holder { 48 int dest_local_nexus; 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 sense_reason_t 82 target_scsi2_reservation_check(struct se_cmd *cmd) 83 { 84 struct se_device *dev = cmd->se_dev; 85 struct se_session *sess = cmd->se_sess; 86 87 switch (cmd->t_task_cdb[0]) { 88 case INQUIRY: 89 case RELEASE: 90 case RELEASE_10: 91 return 0; 92 default: 93 break; 94 } 95 96 if (!dev->dev_reserved_node_acl || !sess) 97 return 0; 98 99 if (dev->dev_reserved_node_acl != sess->se_node_acl) 100 return TCM_RESERVATION_CONFLICT; 101 102 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 103 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 104 return TCM_RESERVATION_CONFLICT; 105 } 106 107 return 0; 108 } 109 110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 111 struct se_node_acl *, struct se_session *); 112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 113 114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 115 { 116 struct se_session *se_sess = cmd->se_sess; 117 struct se_device *dev = cmd->se_dev; 118 struct t10_pr_registration *pr_reg; 119 struct t10_reservation *pr_tmpl = &dev->t10_pr; 120 int conflict = 0; 121 122 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 123 se_sess); 124 if (pr_reg) { 125 /* 126 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 127 * behavior 128 * 129 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 130 * status, but no reservation shall be established and the 131 * persistent reservation shall not be changed, if the command 132 * is received from a) and b) below. 133 * 134 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 135 * status, but the persistent reservation shall not be released, 136 * if the command is received from a) and b) 137 * 138 * a) An I_T nexus that is a persistent reservation holder; or 139 * b) An I_T nexus that is registered if a registrants only or 140 * all registrants type persistent reservation is present. 141 * 142 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 143 * RELEASE(6) command, or RELEASE(10) command shall be processed 144 * as defined in SPC-2. 145 */ 146 if (pr_reg->pr_res_holder) { 147 core_scsi3_put_pr_reg(pr_reg); 148 return 1; 149 } 150 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 151 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 152 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 153 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 154 core_scsi3_put_pr_reg(pr_reg); 155 return 1; 156 } 157 core_scsi3_put_pr_reg(pr_reg); 158 conflict = 1; 159 } else { 160 /* 161 * Following spc2r20 5.5.1 Reservations overview: 162 * 163 * If a logical unit has executed a PERSISTENT RESERVE OUT 164 * command with the REGISTER or the REGISTER AND IGNORE 165 * EXISTING KEY service action and is still registered by any 166 * initiator, all RESERVE commands and all RELEASE commands 167 * regardless of initiator shall conflict and shall terminate 168 * with a RESERVATION CONFLICT status. 169 */ 170 spin_lock(&pr_tmpl->registration_lock); 171 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 172 spin_unlock(&pr_tmpl->registration_lock); 173 } 174 175 if (conflict) { 176 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 177 " while active SPC-3 registrations exist," 178 " returning RESERVATION_CONFLICT\n"); 179 return -EBUSY; 180 } 181 182 return 0; 183 } 184 185 sense_reason_t 186 target_scsi2_reservation_release(struct se_cmd *cmd) 187 { 188 struct se_device *dev = cmd->se_dev; 189 struct se_session *sess = cmd->se_sess; 190 struct se_portal_group *tpg; 191 int rc; 192 193 if (!sess || !sess->se_tpg) 194 goto out; 195 rc = target_check_scsi2_reservation_conflict(cmd); 196 if (rc == 1) 197 goto out; 198 if (rc < 0) 199 return TCM_RESERVATION_CONFLICT; 200 201 spin_lock(&dev->dev_reservation_lock); 202 if (!dev->dev_reserved_node_acl || !sess) 203 goto out_unlock; 204 205 if (dev->dev_reserved_node_acl != sess->se_node_acl) 206 goto out_unlock; 207 208 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 209 goto out_unlock; 210 211 dev->dev_reserved_node_acl = NULL; 212 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 213 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { 214 dev->dev_res_bin_isid = 0; 215 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; 216 } 217 tpg = sess->se_tpg; 218 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 219 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 220 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 221 sess->se_node_acl->initiatorname); 222 223 out_unlock: 224 spin_unlock(&dev->dev_reservation_lock); 225 out: 226 target_complete_cmd(cmd, GOOD); 227 return 0; 228 } 229 230 sense_reason_t 231 target_scsi2_reservation_reserve(struct se_cmd *cmd) 232 { 233 struct se_device *dev = cmd->se_dev; 234 struct se_session *sess = cmd->se_sess; 235 struct se_portal_group *tpg; 236 sense_reason_t ret = 0; 237 int rc; 238 239 if ((cmd->t_task_cdb[1] & 0x01) && 240 (cmd->t_task_cdb[1] & 0x02)) { 241 pr_err("LongIO and Obselete Bits set, returning" 242 " ILLEGAL_REQUEST\n"); 243 return TCM_UNSUPPORTED_SCSI_OPCODE; 244 } 245 /* 246 * This is currently the case for target_core_mod passthrough struct se_cmd 247 * ops 248 */ 249 if (!sess || !sess->se_tpg) 250 goto out; 251 rc = target_check_scsi2_reservation_conflict(cmd); 252 if (rc == 1) 253 goto out; 254 255 if (rc < 0) 256 return TCM_RESERVATION_CONFLICT; 257 258 tpg = sess->se_tpg; 259 spin_lock(&dev->dev_reservation_lock); 260 if (dev->dev_reserved_node_acl && 261 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 262 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 263 tpg->se_tpg_tfo->get_fabric_name()); 264 pr_err("Original reserver LUN: %u %s\n", 265 cmd->se_lun->unpacked_lun, 266 dev->dev_reserved_node_acl->initiatorname); 267 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 268 " from %s \n", cmd->se_lun->unpacked_lun, 269 cmd->se_deve->mapped_lun, 270 sess->se_node_acl->initiatorname); 271 ret = TCM_RESERVATION_CONFLICT; 272 goto out_unlock; 273 } 274 275 dev->dev_reserved_node_acl = sess->se_node_acl; 276 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; 277 if (sess->sess_bin_isid != 0) { 278 dev->dev_res_bin_isid = sess->sess_bin_isid; 279 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; 280 } 281 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 282 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 283 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 284 sess->se_node_acl->initiatorname); 285 286 out_unlock: 287 spin_unlock(&dev->dev_reservation_lock); 288 out: 289 if (!ret) 290 target_complete_cmd(cmd, GOOD); 291 return ret; 292 } 293 294 295 /* 296 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 297 * 298 * This function is called by those initiator ports who are *NOT* 299 * the active PR reservation holder when a reservation is present. 300 */ 301 static int core_scsi3_pr_seq_non_holder( 302 struct se_cmd *cmd, 303 u32 pr_reg_type) 304 { 305 unsigned char *cdb = cmd->t_task_cdb; 306 struct se_dev_entry *se_deve; 307 struct se_session *se_sess = cmd->se_sess; 308 int other_cdb = 0, ignore_reg; 309 int registered_nexus = 0, ret = 1; /* Conflict by default */ 310 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 311 int we = 0; /* Write Exclusive */ 312 int legacy = 0; /* Act like a legacy device and return 313 * RESERVATION CONFLICT on some CDBs */ 314 315 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 316 /* 317 * Determine if the registration should be ignored due to 318 * non-matching ISIDs in target_scsi3_pr_reservation_check(). 319 */ 320 ignore_reg = (pr_reg_type & 0x80000000); 321 if (ignore_reg) 322 pr_reg_type &= ~0x80000000; 323 324 switch (pr_reg_type) { 325 case PR_TYPE_WRITE_EXCLUSIVE: 326 we = 1; 327 case PR_TYPE_EXCLUSIVE_ACCESS: 328 /* 329 * Some commands are only allowed for the persistent reservation 330 * holder. 331 */ 332 if ((se_deve->def_pr_registered) && !(ignore_reg)) 333 registered_nexus = 1; 334 break; 335 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 336 we = 1; 337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 338 /* 339 * Some commands are only allowed for registered I_T Nexuses. 340 */ 341 reg_only = 1; 342 if ((se_deve->def_pr_registered) && !(ignore_reg)) 343 registered_nexus = 1; 344 break; 345 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 346 we = 1; 347 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 348 /* 349 * Each registered I_T Nexus is a reservation holder. 350 */ 351 all_reg = 1; 352 if ((se_deve->def_pr_registered) && !(ignore_reg)) 353 registered_nexus = 1; 354 break; 355 default: 356 return -EINVAL; 357 } 358 /* 359 * Referenced from spc4r17 table 45 for *NON* PR holder access 360 */ 361 switch (cdb[0]) { 362 case SECURITY_PROTOCOL_IN: 363 if (registered_nexus) 364 return 0; 365 ret = (we) ? 0 : 1; 366 break; 367 case MODE_SENSE: 368 case MODE_SENSE_10: 369 case READ_ATTRIBUTE: 370 case READ_BUFFER: 371 case RECEIVE_DIAGNOSTIC: 372 if (legacy) { 373 ret = 1; 374 break; 375 } 376 if (registered_nexus) { 377 ret = 0; 378 break; 379 } 380 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 381 break; 382 case PERSISTENT_RESERVE_OUT: 383 /* 384 * This follows PERSISTENT_RESERVE_OUT service actions that 385 * are allowed in the presence of various reservations. 386 * See spc4r17, table 46 387 */ 388 switch (cdb[1] & 0x1f) { 389 case PRO_CLEAR: 390 case PRO_PREEMPT: 391 case PRO_PREEMPT_AND_ABORT: 392 ret = (registered_nexus) ? 0 : 1; 393 break; 394 case PRO_REGISTER: 395 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 396 ret = 0; 397 break; 398 case PRO_REGISTER_AND_MOVE: 399 case PRO_RESERVE: 400 ret = 1; 401 break; 402 case PRO_RELEASE: 403 ret = (registered_nexus) ? 0 : 1; 404 break; 405 default: 406 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 407 " action: 0x%02x\n", cdb[1] & 0x1f); 408 return -EINVAL; 409 } 410 break; 411 case RELEASE: 412 case RELEASE_10: 413 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 414 ret = 0; 415 break; 416 case RESERVE: 417 case RESERVE_10: 418 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 419 ret = 0; 420 break; 421 case TEST_UNIT_READY: 422 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 423 break; 424 case MAINTENANCE_IN: 425 switch (cdb[1] & 0x1f) { 426 case MI_MANAGEMENT_PROTOCOL_IN: 427 if (registered_nexus) { 428 ret = 0; 429 break; 430 } 431 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 432 break; 433 case MI_REPORT_SUPPORTED_OPERATION_CODES: 434 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 435 if (legacy) { 436 ret = 1; 437 break; 438 } 439 if (registered_nexus) { 440 ret = 0; 441 break; 442 } 443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 444 break; 445 case MI_REPORT_ALIASES: 446 case MI_REPORT_IDENTIFYING_INFORMATION: 447 case MI_REPORT_PRIORITY: 448 case MI_REPORT_TARGET_PGS: 449 case MI_REPORT_TIMESTAMP: 450 ret = 0; /* Allowed */ 451 break; 452 default: 453 pr_err("Unknown MI Service Action: 0x%02x\n", 454 (cdb[1] & 0x1f)); 455 return -EINVAL; 456 } 457 break; 458 case ACCESS_CONTROL_IN: 459 case ACCESS_CONTROL_OUT: 460 case INQUIRY: 461 case LOG_SENSE: 462 case SERVICE_ACTION_IN_12: 463 case REPORT_LUNS: 464 case REQUEST_SENSE: 465 case PERSISTENT_RESERVE_IN: 466 ret = 0; /*/ Allowed CDBs */ 467 break; 468 default: 469 other_cdb = 1; 470 break; 471 } 472 /* 473 * Case where the CDB is explicitly allowed in the above switch 474 * statement. 475 */ 476 if (!ret && !other_cdb) { 477 pr_debug("Allowing explicit CDB: 0x%02x for %s" 478 " reservation holder\n", cdb[0], 479 core_scsi3_pr_dump_type(pr_reg_type)); 480 481 return ret; 482 } 483 /* 484 * Check if write exclusive initiator ports *NOT* holding the 485 * WRITE_EXCLUSIVE_* reservation. 486 */ 487 if (we && !registered_nexus) { 488 if (cmd->data_direction == DMA_TO_DEVICE) { 489 /* 490 * Conflict for write exclusive 491 */ 492 pr_debug("%s Conflict for unregistered nexus" 493 " %s CDB: 0x%02x to %s reservation\n", 494 transport_dump_cmd_direction(cmd), 495 se_sess->se_node_acl->initiatorname, cdb[0], 496 core_scsi3_pr_dump_type(pr_reg_type)); 497 return 1; 498 } else { 499 /* 500 * Allow non WRITE CDBs for all Write Exclusive 501 * PR TYPEs to pass for registered and 502 * non-registered_nexuxes NOT holding the reservation. 503 * 504 * We only make noise for the unregisterd nexuses, 505 * as we expect registered non-reservation holding 506 * nexuses to issue CDBs. 507 */ 508 509 if (!registered_nexus) { 510 pr_debug("Allowing implicit CDB: 0x%02x" 511 " for %s reservation on unregistered" 512 " nexus\n", cdb[0], 513 core_scsi3_pr_dump_type(pr_reg_type)); 514 } 515 516 return 0; 517 } 518 } else if ((reg_only) || (all_reg)) { 519 if (registered_nexus) { 520 /* 521 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 522 * allow commands from registered nexuses. 523 */ 524 525 pr_debug("Allowing implicit CDB: 0x%02x for %s" 526 " reservation\n", cdb[0], 527 core_scsi3_pr_dump_type(pr_reg_type)); 528 529 return 0; 530 } 531 } else if (we && registered_nexus) { 532 /* 533 * Reads are allowed for Write Exclusive locks 534 * from all registrants. 535 */ 536 if (cmd->data_direction == DMA_FROM_DEVICE) { 537 pr_debug("Allowing READ CDB: 0x%02x for %s" 538 " reservation\n", cdb[0], 539 core_scsi3_pr_dump_type(pr_reg_type)); 540 541 return 0; 542 } 543 } 544 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 545 " for %s reservation\n", transport_dump_cmd_direction(cmd), 546 (registered_nexus) ? "" : "un", 547 se_sess->se_node_acl->initiatorname, cdb[0], 548 core_scsi3_pr_dump_type(pr_reg_type)); 549 550 return 1; /* Conflict by default */ 551 } 552 553 static sense_reason_t 554 target_scsi3_pr_reservation_check(struct se_cmd *cmd) 555 { 556 struct se_device *dev = cmd->se_dev; 557 struct se_session *sess = cmd->se_sess; 558 u32 pr_reg_type; 559 560 if (!dev->dev_pr_res_holder) 561 return 0; 562 563 pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 564 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 565 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) 566 goto check_nonholder; 567 568 if (dev->dev_pr_res_holder->isid_present_at_reg) { 569 if (dev->dev_pr_res_holder->pr_reg_bin_isid != 570 sess->sess_bin_isid) { 571 pr_reg_type |= 0x80000000; 572 goto check_nonholder; 573 } 574 } 575 576 return 0; 577 578 check_nonholder: 579 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type)) 580 return TCM_RESERVATION_CONFLICT; 581 return 0; 582 } 583 584 static u32 core_scsi3_pr_generation(struct se_device *dev) 585 { 586 u32 prg; 587 588 /* 589 * PRGeneration field shall contain the value of a 32-bit wrapping 590 * counter mainted by the device server. 591 * 592 * Note that this is done regardless of Active Persist across 593 * Target PowerLoss (APTPL) 594 * 595 * See spc4r17 section 6.3.12 READ_KEYS service action 596 */ 597 spin_lock(&dev->dev_reservation_lock); 598 prg = dev->t10_pr.pr_generation++; 599 spin_unlock(&dev->dev_reservation_lock); 600 601 return prg; 602 } 603 604 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 605 struct se_device *dev, 606 struct se_node_acl *nacl, 607 struct se_dev_entry *deve, 608 unsigned char *isid, 609 u64 sa_res_key, 610 int all_tg_pt, 611 int aptpl) 612 { 613 struct t10_pr_registration *pr_reg; 614 615 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 616 if (!pr_reg) { 617 pr_err("Unable to allocate struct t10_pr_registration\n"); 618 return NULL; 619 } 620 621 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 622 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 623 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 624 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 625 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 626 atomic_set(&pr_reg->pr_res_holders, 0); 627 pr_reg->pr_reg_nacl = nacl; 628 pr_reg->pr_reg_deve = deve; 629 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 630 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 631 pr_reg->pr_res_key = sa_res_key; 632 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 633 pr_reg->pr_reg_aptpl = aptpl; 634 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 635 /* 636 * If an ISID value for this SCSI Initiator Port exists, 637 * save it to the registration now. 638 */ 639 if (isid != NULL) { 640 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 641 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 642 pr_reg->isid_present_at_reg = 1; 643 } 644 645 return pr_reg; 646 } 647 648 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 649 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 650 651 /* 652 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 653 * modes. 654 */ 655 static struct t10_pr_registration *__core_scsi3_alloc_registration( 656 struct se_device *dev, 657 struct se_node_acl *nacl, 658 struct se_dev_entry *deve, 659 unsigned char *isid, 660 u64 sa_res_key, 661 int all_tg_pt, 662 int aptpl) 663 { 664 struct se_dev_entry *deve_tmp; 665 struct se_node_acl *nacl_tmp; 666 struct se_port *port, *port_tmp; 667 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 668 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 669 int ret; 670 /* 671 * Create a registration for the I_T Nexus upon which the 672 * PROUT REGISTER was received. 673 */ 674 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 675 sa_res_key, all_tg_pt, aptpl); 676 if (!pr_reg) 677 return NULL; 678 /* 679 * Return pointer to pr_reg for ALL_TG_PT=0 680 */ 681 if (!all_tg_pt) 682 return pr_reg; 683 /* 684 * Create list of matching SCSI Initiator Port registrations 685 * for ALL_TG_PT=1 686 */ 687 spin_lock(&dev->se_port_lock); 688 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 689 atomic_inc_mb(&port->sep_tg_pt_ref_cnt); 690 spin_unlock(&dev->se_port_lock); 691 692 spin_lock_bh(&port->sep_alua_lock); 693 list_for_each_entry(deve_tmp, &port->sep_alua_list, 694 alua_port_list) { 695 /* 696 * This pointer will be NULL for demo mode MappedLUNs 697 * that have not been make explicit via a ConfigFS 698 * MappedLUN group for the SCSI Initiator Node ACL. 699 */ 700 if (!deve_tmp->se_lun_acl) 701 continue; 702 703 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 704 /* 705 * Skip the matching struct se_node_acl that is allocated 706 * above.. 707 */ 708 if (nacl == nacl_tmp) 709 continue; 710 /* 711 * Only perform PR registrations for target ports on 712 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 713 * arrived. 714 */ 715 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 716 continue; 717 /* 718 * Look for a matching Initiator Node ACL in ASCII format 719 */ 720 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 721 continue; 722 723 atomic_inc_mb(&deve_tmp->pr_ref_count); 724 spin_unlock_bh(&port->sep_alua_lock); 725 /* 726 * Grab a configfs group dependency that is released 727 * for the exception path at label out: below, or upon 728 * completion of adding ALL_TG_PT=1 registrations in 729 * __core_scsi3_add_registration() 730 */ 731 ret = core_scsi3_lunacl_depend_item(deve_tmp); 732 if (ret < 0) { 733 pr_err("core_scsi3_lunacl_depend" 734 "_item() failed\n"); 735 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 736 atomic_dec_mb(&deve_tmp->pr_ref_count); 737 goto out; 738 } 739 /* 740 * Located a matching SCSI Initiator Port on a different 741 * port, allocate the pr_reg_atp and attach it to the 742 * pr_reg->pr_reg_atp_list that will be processed once 743 * the original *pr_reg is processed in 744 * __core_scsi3_add_registration() 745 */ 746 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 747 nacl_tmp, deve_tmp, NULL, 748 sa_res_key, all_tg_pt, aptpl); 749 if (!pr_reg_atp) { 750 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 751 atomic_dec_mb(&deve_tmp->pr_ref_count); 752 core_scsi3_lunacl_undepend_item(deve_tmp); 753 goto out; 754 } 755 756 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 757 &pr_reg->pr_reg_atp_list); 758 spin_lock_bh(&port->sep_alua_lock); 759 } 760 spin_unlock_bh(&port->sep_alua_lock); 761 762 spin_lock(&dev->se_port_lock); 763 atomic_dec_mb(&port->sep_tg_pt_ref_cnt); 764 } 765 spin_unlock(&dev->se_port_lock); 766 767 return pr_reg; 768 out: 769 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 770 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 771 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 772 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 773 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 774 } 775 kmem_cache_free(t10_pr_reg_cache, pr_reg); 776 return NULL; 777 } 778 779 int core_scsi3_alloc_aptpl_registration( 780 struct t10_reservation *pr_tmpl, 781 u64 sa_res_key, 782 unsigned char *i_port, 783 unsigned char *isid, 784 u32 mapped_lun, 785 unsigned char *t_port, 786 u16 tpgt, 787 u32 target_lun, 788 int res_holder, 789 int all_tg_pt, 790 u8 type) 791 { 792 struct t10_pr_registration *pr_reg; 793 794 if (!i_port || !t_port || !sa_res_key) { 795 pr_err("Illegal parameters for APTPL registration\n"); 796 return -EINVAL; 797 } 798 799 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 800 if (!pr_reg) { 801 pr_err("Unable to allocate struct t10_pr_registration\n"); 802 return -ENOMEM; 803 } 804 805 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 806 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 807 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 808 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 809 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 810 atomic_set(&pr_reg->pr_res_holders, 0); 811 pr_reg->pr_reg_nacl = NULL; 812 pr_reg->pr_reg_deve = NULL; 813 pr_reg->pr_res_mapped_lun = mapped_lun; 814 pr_reg->pr_aptpl_target_lun = target_lun; 815 pr_reg->pr_res_key = sa_res_key; 816 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 817 pr_reg->pr_reg_aptpl = 1; 818 pr_reg->pr_reg_tg_pt_lun = NULL; 819 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 820 pr_reg->pr_res_type = type; 821 /* 822 * If an ISID value had been saved in APTPL metadata for this 823 * SCSI Initiator Port, restore it now. 824 */ 825 if (isid != NULL) { 826 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 827 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 828 pr_reg->isid_present_at_reg = 1; 829 } 830 /* 831 * Copy the i_port and t_port information from caller. 832 */ 833 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 834 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 835 pr_reg->pr_reg_tpgt = tpgt; 836 /* 837 * Set pr_res_holder from caller, the pr_reg who is the reservation 838 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 839 * the Initiator Node LUN ACL from the fabric module is created for 840 * this registration. 841 */ 842 pr_reg->pr_res_holder = res_holder; 843 844 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 845 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 846 " metadata\n", (res_holder) ? "+reservation" : ""); 847 return 0; 848 } 849 850 static void core_scsi3_aptpl_reserve( 851 struct se_device *dev, 852 struct se_portal_group *tpg, 853 struct se_node_acl *node_acl, 854 struct t10_pr_registration *pr_reg) 855 { 856 char i_buf[PR_REG_ISID_ID_LEN]; 857 858 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 859 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 860 861 spin_lock(&dev->dev_reservation_lock); 862 dev->dev_pr_res_holder = pr_reg; 863 spin_unlock(&dev->dev_reservation_lock); 864 865 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 866 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 867 tpg->se_tpg_tfo->get_fabric_name(), 868 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 869 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 870 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 871 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 872 i_buf); 873 } 874 875 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 876 struct t10_pr_registration *, enum register_type, int); 877 878 static int __core_scsi3_check_aptpl_registration( 879 struct se_device *dev, 880 struct se_portal_group *tpg, 881 struct se_lun *lun, 882 u32 target_lun, 883 struct se_node_acl *nacl, 884 struct se_dev_entry *deve) 885 { 886 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 887 struct t10_reservation *pr_tmpl = &dev->t10_pr; 888 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 889 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 890 u16 tpgt; 891 892 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 893 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 894 /* 895 * Copy Initiator Port information from struct se_node_acl 896 */ 897 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 898 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 899 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 900 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 901 /* 902 * Look for the matching registrations+reservation from those 903 * created from APTPL metadata. Note that multiple registrations 904 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 905 * TransportIDs. 906 */ 907 spin_lock(&pr_tmpl->aptpl_reg_lock); 908 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 909 pr_reg_aptpl_list) { 910 911 if (!strcmp(pr_reg->pr_iport, i_port) && 912 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 913 !(strcmp(pr_reg->pr_tport, t_port)) && 914 (pr_reg->pr_reg_tpgt == tpgt) && 915 (pr_reg->pr_aptpl_target_lun == target_lun)) { 916 917 pr_reg->pr_reg_nacl = nacl; 918 pr_reg->pr_reg_deve = deve; 919 pr_reg->pr_reg_tg_pt_lun = lun; 920 921 list_del(&pr_reg->pr_reg_aptpl_list); 922 spin_unlock(&pr_tmpl->aptpl_reg_lock); 923 /* 924 * At this point all of the pointers in *pr_reg will 925 * be setup, so go ahead and add the registration. 926 */ 927 928 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 929 /* 930 * If this registration is the reservation holder, 931 * make that happen now.. 932 */ 933 if (pr_reg->pr_res_holder) 934 core_scsi3_aptpl_reserve(dev, tpg, 935 nacl, pr_reg); 936 /* 937 * Reenable pr_aptpl_active to accept new metadata 938 * updates once the SCSI device is active again.. 939 */ 940 spin_lock(&pr_tmpl->aptpl_reg_lock); 941 pr_tmpl->pr_aptpl_active = 1; 942 } 943 } 944 spin_unlock(&pr_tmpl->aptpl_reg_lock); 945 946 return 0; 947 } 948 949 int core_scsi3_check_aptpl_registration( 950 struct se_device *dev, 951 struct se_portal_group *tpg, 952 struct se_lun *lun, 953 struct se_node_acl *nacl, 954 u32 mapped_lun) 955 { 956 struct se_dev_entry *deve = nacl->device_list[mapped_lun]; 957 958 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 959 return 0; 960 961 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 962 lun->unpacked_lun, nacl, deve); 963 } 964 965 static void __core_scsi3_dump_registration( 966 struct target_core_fabric_ops *tfo, 967 struct se_device *dev, 968 struct se_node_acl *nacl, 969 struct t10_pr_registration *pr_reg, 970 enum register_type register_type) 971 { 972 struct se_portal_group *se_tpg = nacl->se_tpg; 973 char i_buf[PR_REG_ISID_ID_LEN]; 974 975 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 976 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 977 978 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 979 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ? 980 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? 981 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 982 i_buf); 983 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 984 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 985 tfo->tpg_get_tag(se_tpg)); 986 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 987 " Port(s)\n", tfo->get_fabric_name(), 988 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 989 dev->transport->name); 990 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 991 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 992 pr_reg->pr_res_key, pr_reg->pr_res_generation, 993 pr_reg->pr_reg_aptpl); 994 } 995 996 /* 997 * this function can be called with struct se_device->dev_reservation_lock 998 * when register_move = 1 999 */ 1000 static void __core_scsi3_add_registration( 1001 struct se_device *dev, 1002 struct se_node_acl *nacl, 1003 struct t10_pr_registration *pr_reg, 1004 enum register_type register_type, 1005 int register_move) 1006 { 1007 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1008 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1009 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1010 1011 /* 1012 * Increment PRgeneration counter for struct se_device upon a successful 1013 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1014 * 1015 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1016 * action, the struct se_device->dev_reservation_lock will already be held, 1017 * so we do not call core_scsi3_pr_generation() which grabs the lock 1018 * for the REGISTER. 1019 */ 1020 pr_reg->pr_res_generation = (register_move) ? 1021 dev->t10_pr.pr_generation++ : 1022 core_scsi3_pr_generation(dev); 1023 1024 spin_lock(&pr_tmpl->registration_lock); 1025 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1026 pr_reg->pr_reg_deve->def_pr_registered = 1; 1027 1028 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1029 spin_unlock(&pr_tmpl->registration_lock); 1030 /* 1031 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1032 */ 1033 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1034 return; 1035 /* 1036 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1037 * allocated in __core_scsi3_alloc_registration() 1038 */ 1039 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1040 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1041 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1042 1043 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1044 1045 spin_lock(&pr_tmpl->registration_lock); 1046 list_add_tail(&pr_reg_tmp->pr_reg_list, 1047 &pr_tmpl->registration_list); 1048 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1049 1050 __core_scsi3_dump_registration(tfo, dev, 1051 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1052 register_type); 1053 spin_unlock(&pr_tmpl->registration_lock); 1054 /* 1055 * Drop configfs group dependency reference from 1056 * __core_scsi3_alloc_registration() 1057 */ 1058 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1059 } 1060 } 1061 1062 static int core_scsi3_alloc_registration( 1063 struct se_device *dev, 1064 struct se_node_acl *nacl, 1065 struct se_dev_entry *deve, 1066 unsigned char *isid, 1067 u64 sa_res_key, 1068 int all_tg_pt, 1069 int aptpl, 1070 enum register_type register_type, 1071 int register_move) 1072 { 1073 struct t10_pr_registration *pr_reg; 1074 1075 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1076 sa_res_key, all_tg_pt, aptpl); 1077 if (!pr_reg) 1078 return -EPERM; 1079 1080 __core_scsi3_add_registration(dev, nacl, pr_reg, 1081 register_type, register_move); 1082 return 0; 1083 } 1084 1085 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1086 struct se_device *dev, 1087 struct se_node_acl *nacl, 1088 unsigned char *isid) 1089 { 1090 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1091 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1092 struct se_portal_group *tpg; 1093 1094 spin_lock(&pr_tmpl->registration_lock); 1095 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1096 &pr_tmpl->registration_list, pr_reg_list) { 1097 /* 1098 * First look for a matching struct se_node_acl 1099 */ 1100 if (pr_reg->pr_reg_nacl != nacl) 1101 continue; 1102 1103 tpg = pr_reg->pr_reg_nacl->se_tpg; 1104 /* 1105 * If this registration does NOT contain a fabric provided 1106 * ISID, then we have found a match. 1107 */ 1108 if (!pr_reg->isid_present_at_reg) { 1109 /* 1110 * Determine if this SCSI device server requires that 1111 * SCSI Intiatior TransportID w/ ISIDs is enforced 1112 * for fabric modules (iSCSI) requiring them. 1113 */ 1114 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1115 if (dev->dev_attrib.enforce_pr_isids) 1116 continue; 1117 } 1118 atomic_inc_mb(&pr_reg->pr_res_holders); 1119 spin_unlock(&pr_tmpl->registration_lock); 1120 return pr_reg; 1121 } 1122 /* 1123 * If the *pr_reg contains a fabric defined ISID for multi-value 1124 * SCSI Initiator Port TransportIDs, then we expect a valid 1125 * matching ISID to be provided by the local SCSI Initiator Port. 1126 */ 1127 if (!isid) 1128 continue; 1129 if (strcmp(isid, pr_reg->pr_reg_isid)) 1130 continue; 1131 1132 atomic_inc_mb(&pr_reg->pr_res_holders); 1133 spin_unlock(&pr_tmpl->registration_lock); 1134 return pr_reg; 1135 } 1136 spin_unlock(&pr_tmpl->registration_lock); 1137 1138 return NULL; 1139 } 1140 1141 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1142 struct se_device *dev, 1143 struct se_node_acl *nacl, 1144 struct se_session *sess) 1145 { 1146 struct se_portal_group *tpg = nacl->se_tpg; 1147 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1148 1149 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1150 memset(&buf[0], 0, PR_REG_ISID_LEN); 1151 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1152 PR_REG_ISID_LEN); 1153 isid_ptr = &buf[0]; 1154 } 1155 1156 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1157 } 1158 1159 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1160 { 1161 atomic_dec_mb(&pr_reg->pr_res_holders); 1162 } 1163 1164 static int core_scsi3_check_implicit_release( 1165 struct se_device *dev, 1166 struct t10_pr_registration *pr_reg) 1167 { 1168 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1169 struct t10_pr_registration *pr_res_holder; 1170 int ret = 0; 1171 1172 spin_lock(&dev->dev_reservation_lock); 1173 pr_res_holder = dev->dev_pr_res_holder; 1174 if (!pr_res_holder) { 1175 spin_unlock(&dev->dev_reservation_lock); 1176 return ret; 1177 } 1178 if (pr_res_holder == pr_reg) { 1179 /* 1180 * Perform an implicit RELEASE if the registration that 1181 * is being released is holding the reservation. 1182 * 1183 * From spc4r17, section 5.7.11.1: 1184 * 1185 * e) If the I_T nexus is the persistent reservation holder 1186 * and the persistent reservation is not an all registrants 1187 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1188 * service action or REGISTER AND IGNORE EXISTING KEY 1189 * service action with the SERVICE ACTION RESERVATION KEY 1190 * field set to zero (see 5.7.11.3). 1191 */ 1192 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1); 1193 ret = 1; 1194 /* 1195 * For 'All Registrants' reservation types, all existing 1196 * registrations are still processed as reservation holders 1197 * in core_scsi3_pr_seq_non_holder() after the initial 1198 * reservation holder is implicitly released here. 1199 */ 1200 } else if (pr_reg->pr_reg_all_tg_pt && 1201 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1202 pr_reg->pr_reg_nacl->initiatorname)) && 1203 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1204 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1205 " UNREGISTER while existing reservation with matching" 1206 " key 0x%016Lx is present from another SCSI Initiator" 1207 " Port\n", pr_reg->pr_res_key); 1208 ret = -EPERM; 1209 } 1210 spin_unlock(&dev->dev_reservation_lock); 1211 1212 return ret; 1213 } 1214 1215 /* 1216 * Called with struct t10_reservation->registration_lock held. 1217 */ 1218 static void __core_scsi3_free_registration( 1219 struct se_device *dev, 1220 struct t10_pr_registration *pr_reg, 1221 struct list_head *preempt_and_abort_list, 1222 int dec_holders) 1223 { 1224 struct target_core_fabric_ops *tfo = 1225 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1226 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1227 char i_buf[PR_REG_ISID_ID_LEN]; 1228 1229 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1230 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1231 1232 pr_reg->pr_reg_deve->def_pr_registered = 0; 1233 pr_reg->pr_reg_deve->pr_res_key = 0; 1234 if (!list_empty(&pr_reg->pr_reg_list)) 1235 list_del(&pr_reg->pr_reg_list); 1236 /* 1237 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1238 * so call core_scsi3_put_pr_reg() to decrement our reference. 1239 */ 1240 if (dec_holders) 1241 core_scsi3_put_pr_reg(pr_reg); 1242 /* 1243 * Wait until all reference from any other I_T nexuses for this 1244 * *pr_reg have been released. Because list_del() is called above, 1245 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1246 * count back to zero, and we release *pr_reg. 1247 */ 1248 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1249 spin_unlock(&pr_tmpl->registration_lock); 1250 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1251 tfo->get_fabric_name()); 1252 cpu_relax(); 1253 spin_lock(&pr_tmpl->registration_lock); 1254 } 1255 1256 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1257 " Node: %s%s\n", tfo->get_fabric_name(), 1258 pr_reg->pr_reg_nacl->initiatorname, 1259 i_buf); 1260 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1261 " Port(s)\n", tfo->get_fabric_name(), 1262 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1263 dev->transport->name); 1264 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1265 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1266 pr_reg->pr_res_generation); 1267 1268 if (!preempt_and_abort_list) { 1269 pr_reg->pr_reg_deve = NULL; 1270 pr_reg->pr_reg_nacl = NULL; 1271 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1272 return; 1273 } 1274 /* 1275 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1276 * are released once the ABORT_TASK_SET has completed.. 1277 */ 1278 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1279 } 1280 1281 void core_scsi3_free_pr_reg_from_nacl( 1282 struct se_device *dev, 1283 struct se_node_acl *nacl) 1284 { 1285 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1286 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1287 bool free_reg = false; 1288 /* 1289 * If the passed se_node_acl matches the reservation holder, 1290 * release the reservation. 1291 */ 1292 spin_lock(&dev->dev_reservation_lock); 1293 pr_res_holder = dev->dev_pr_res_holder; 1294 if ((pr_res_holder != NULL) && 1295 (pr_res_holder->pr_reg_nacl == nacl)) { 1296 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1); 1297 free_reg = true; 1298 } 1299 spin_unlock(&dev->dev_reservation_lock); 1300 /* 1301 * Release any registration associated with the struct se_node_acl. 1302 */ 1303 spin_lock(&pr_tmpl->registration_lock); 1304 if (pr_res_holder && free_reg) 1305 __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0); 1306 1307 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1308 &pr_tmpl->registration_list, pr_reg_list) { 1309 1310 if (pr_reg->pr_reg_nacl != nacl) 1311 continue; 1312 1313 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1314 } 1315 spin_unlock(&pr_tmpl->registration_lock); 1316 } 1317 1318 void core_scsi3_free_all_registrations( 1319 struct se_device *dev) 1320 { 1321 struct t10_reservation *pr_tmpl = &dev->t10_pr; 1322 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1323 1324 spin_lock(&dev->dev_reservation_lock); 1325 pr_res_holder = dev->dev_pr_res_holder; 1326 if (pr_res_holder != NULL) { 1327 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1328 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1329 pr_res_holder, 0, 0); 1330 } 1331 spin_unlock(&dev->dev_reservation_lock); 1332 1333 spin_lock(&pr_tmpl->registration_lock); 1334 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1335 &pr_tmpl->registration_list, pr_reg_list) { 1336 1337 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1338 } 1339 spin_unlock(&pr_tmpl->registration_lock); 1340 1341 spin_lock(&pr_tmpl->aptpl_reg_lock); 1342 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1343 pr_reg_aptpl_list) { 1344 list_del(&pr_reg->pr_reg_aptpl_list); 1345 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1346 } 1347 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1348 } 1349 1350 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1351 { 1352 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1353 &tpg->tpg_group.cg_item); 1354 } 1355 1356 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1357 { 1358 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1359 &tpg->tpg_group.cg_item); 1360 1361 atomic_dec_mb(&tpg->tpg_pr_ref_count); 1362 } 1363 1364 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1365 { 1366 struct se_portal_group *tpg = nacl->se_tpg; 1367 1368 if (nacl->dynamic_node_acl) 1369 return 0; 1370 1371 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1372 &nacl->acl_group.cg_item); 1373 } 1374 1375 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1376 { 1377 struct se_portal_group *tpg = nacl->se_tpg; 1378 1379 if (nacl->dynamic_node_acl) { 1380 atomic_dec_mb(&nacl->acl_pr_ref_count); 1381 return; 1382 } 1383 1384 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1385 &nacl->acl_group.cg_item); 1386 1387 atomic_dec_mb(&nacl->acl_pr_ref_count); 1388 } 1389 1390 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1391 { 1392 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1393 struct se_node_acl *nacl; 1394 struct se_portal_group *tpg; 1395 /* 1396 * For nacl->dynamic_node_acl=1 1397 */ 1398 if (!lun_acl) 1399 return 0; 1400 1401 nacl = lun_acl->se_lun_nacl; 1402 tpg = nacl->se_tpg; 1403 1404 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1405 &lun_acl->se_lun_group.cg_item); 1406 } 1407 1408 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1409 { 1410 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1411 struct se_node_acl *nacl; 1412 struct se_portal_group *tpg; 1413 /* 1414 * For nacl->dynamic_node_acl=1 1415 */ 1416 if (!lun_acl) { 1417 atomic_dec_mb(&se_deve->pr_ref_count); 1418 return; 1419 } 1420 nacl = lun_acl->se_lun_nacl; 1421 tpg = nacl->se_tpg; 1422 1423 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1424 &lun_acl->se_lun_group.cg_item); 1425 1426 atomic_dec_mb(&se_deve->pr_ref_count); 1427 } 1428 1429 static sense_reason_t 1430 core_scsi3_decode_spec_i_port( 1431 struct se_cmd *cmd, 1432 struct se_portal_group *tpg, 1433 unsigned char *l_isid, 1434 u64 sa_res_key, 1435 int all_tg_pt, 1436 int aptpl) 1437 { 1438 struct se_device *dev = cmd->se_dev; 1439 struct se_port *tmp_port; 1440 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1441 struct se_session *se_sess = cmd->se_sess; 1442 struct se_node_acl *dest_node_acl = NULL; 1443 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1444 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1445 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1446 LIST_HEAD(tid_dest_list); 1447 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1448 struct target_core_fabric_ops *tmp_tf_ops; 1449 unsigned char *buf; 1450 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1451 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 1452 sense_reason_t ret; 1453 u32 tpdl, tid_len = 0; 1454 int dest_local_nexus; 1455 u32 dest_rtpi = 0; 1456 1457 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1458 /* 1459 * Allocate a struct pr_transport_id_holder and setup the 1460 * local_node_acl and local_se_deve pointers and add to 1461 * struct list_head tid_dest_list for add registration 1462 * processing in the loop of tid_dest_list below. 1463 */ 1464 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1465 if (!tidh_new) { 1466 pr_err("Unable to allocate tidh_new\n"); 1467 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1468 } 1469 INIT_LIST_HEAD(&tidh_new->dest_list); 1470 tidh_new->dest_tpg = tpg; 1471 tidh_new->dest_node_acl = se_sess->se_node_acl; 1472 tidh_new->dest_se_deve = local_se_deve; 1473 1474 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1475 se_sess->se_node_acl, local_se_deve, l_isid, 1476 sa_res_key, all_tg_pt, aptpl); 1477 if (!local_pr_reg) { 1478 kfree(tidh_new); 1479 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1480 } 1481 tidh_new->dest_pr_reg = local_pr_reg; 1482 /* 1483 * The local I_T nexus does not hold any configfs dependances, 1484 * so we set tid_h->dest_local_nexus=1 to prevent the 1485 * configfs_undepend_item() calls in the tid_dest_list loops below. 1486 */ 1487 tidh_new->dest_local_nexus = 1; 1488 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1489 1490 if (cmd->data_length < 28) { 1491 pr_warn("SPC-PR: Received PR OUT parameter list" 1492 " length too small: %u\n", cmd->data_length); 1493 ret = TCM_INVALID_PARAMETER_LIST; 1494 goto out; 1495 } 1496 1497 buf = transport_kmap_data_sg(cmd); 1498 if (!buf) { 1499 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1500 goto out; 1501 } 1502 1503 /* 1504 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1505 * first extract TransportID Parameter Data Length, and make sure 1506 * the value matches up to the SCSI expected data transfer length. 1507 */ 1508 tpdl = (buf[24] & 0xff) << 24; 1509 tpdl |= (buf[25] & 0xff) << 16; 1510 tpdl |= (buf[26] & 0xff) << 8; 1511 tpdl |= buf[27] & 0xff; 1512 1513 if ((tpdl + 28) != cmd->data_length) { 1514 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1515 " does not equal CDB data_length: %u\n", tpdl, 1516 cmd->data_length); 1517 ret = TCM_INVALID_PARAMETER_LIST; 1518 goto out_unmap; 1519 } 1520 /* 1521 * Start processing the received transport IDs using the 1522 * receiving I_T Nexus portal's fabric dependent methods to 1523 * obtain the SCSI Initiator Port/Device Identifiers. 1524 */ 1525 ptr = &buf[28]; 1526 1527 while (tpdl > 0) { 1528 proto_ident = (ptr[0] & 0x0f); 1529 dest_tpg = NULL; 1530 1531 spin_lock(&dev->se_port_lock); 1532 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1533 tmp_tpg = tmp_port->sep_tpg; 1534 if (!tmp_tpg) 1535 continue; 1536 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1537 if (!tmp_tf_ops) 1538 continue; 1539 if (!tmp_tf_ops->get_fabric_proto_ident || 1540 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1541 continue; 1542 /* 1543 * Look for the matching proto_ident provided by 1544 * the received TransportID 1545 */ 1546 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1547 if (tmp_proto_ident != proto_ident) 1548 continue; 1549 dest_rtpi = tmp_port->sep_rtpi; 1550 1551 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1552 tmp_tpg, (const char *)ptr, &tid_len, 1553 &iport_ptr); 1554 if (!i_str) 1555 continue; 1556 1557 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count); 1558 spin_unlock(&dev->se_port_lock); 1559 1560 if (core_scsi3_tpg_depend_item(tmp_tpg)) { 1561 pr_err(" core_scsi3_tpg_depend_item()" 1562 " for tmp_tpg\n"); 1563 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count); 1564 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1565 goto out_unmap; 1566 } 1567 /* 1568 * Locate the destination initiator ACL to be registered 1569 * from the decoded fabric module specific TransportID 1570 * at *i_str. 1571 */ 1572 spin_lock_irq(&tmp_tpg->acl_node_lock); 1573 dest_node_acl = __core_tpg_get_initiator_node_acl( 1574 tmp_tpg, i_str); 1575 if (dest_node_acl) 1576 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 1577 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1578 1579 if (!dest_node_acl) { 1580 core_scsi3_tpg_undepend_item(tmp_tpg); 1581 spin_lock(&dev->se_port_lock); 1582 continue; 1583 } 1584 1585 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 1586 pr_err("configfs_depend_item() failed" 1587 " for dest_node_acl->acl_group\n"); 1588 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 1589 core_scsi3_tpg_undepend_item(tmp_tpg); 1590 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1591 goto out_unmap; 1592 } 1593 1594 dest_tpg = tmp_tpg; 1595 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1596 " %s Port RTPI: %hu\n", 1597 dest_tpg->se_tpg_tfo->get_fabric_name(), 1598 dest_node_acl->initiatorname, dest_rtpi); 1599 1600 spin_lock(&dev->se_port_lock); 1601 break; 1602 } 1603 spin_unlock(&dev->se_port_lock); 1604 1605 if (!dest_tpg) { 1606 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1607 " dest_tpg\n"); 1608 ret = TCM_INVALID_PARAMETER_LIST; 1609 goto out_unmap; 1610 } 1611 1612 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1613 " tid_len: %d for %s + %s\n", 1614 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1615 tpdl, tid_len, i_str, iport_ptr); 1616 1617 if (tid_len > tpdl) { 1618 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1619 " %u for Transport ID: %s\n", tid_len, ptr); 1620 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1621 core_scsi3_tpg_undepend_item(dest_tpg); 1622 ret = TCM_INVALID_PARAMETER_LIST; 1623 goto out_unmap; 1624 } 1625 /* 1626 * Locate the desintation struct se_dev_entry pointer for matching 1627 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1628 * Target Port. 1629 */ 1630 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1631 dest_rtpi); 1632 if (!dest_se_deve) { 1633 pr_err("Unable to locate %s dest_se_deve" 1634 " from destination RTPI: %hu\n", 1635 dest_tpg->se_tpg_tfo->get_fabric_name(), 1636 dest_rtpi); 1637 1638 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1639 core_scsi3_tpg_undepend_item(dest_tpg); 1640 ret = TCM_INVALID_PARAMETER_LIST; 1641 goto out_unmap; 1642 } 1643 1644 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 1645 pr_err("core_scsi3_lunacl_depend_item()" 1646 " failed\n"); 1647 atomic_dec_mb(&dest_se_deve->pr_ref_count); 1648 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1649 core_scsi3_tpg_undepend_item(dest_tpg); 1650 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1651 goto out_unmap; 1652 } 1653 1654 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1655 " dest_se_deve mapped_lun: %u\n", 1656 dest_tpg->se_tpg_tfo->get_fabric_name(), 1657 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1658 1659 /* 1660 * Skip any TransportIDs that already have a registration for 1661 * this target port. 1662 */ 1663 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1664 iport_ptr); 1665 if (pr_reg_e) { 1666 core_scsi3_put_pr_reg(pr_reg_e); 1667 core_scsi3_lunacl_undepend_item(dest_se_deve); 1668 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1669 core_scsi3_tpg_undepend_item(dest_tpg); 1670 ptr += tid_len; 1671 tpdl -= tid_len; 1672 tid_len = 0; 1673 continue; 1674 } 1675 /* 1676 * Allocate a struct pr_transport_id_holder and setup 1677 * the dest_node_acl and dest_se_deve pointers for the 1678 * loop below. 1679 */ 1680 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1681 GFP_KERNEL); 1682 if (!tidh_new) { 1683 pr_err("Unable to allocate tidh_new\n"); 1684 core_scsi3_lunacl_undepend_item(dest_se_deve); 1685 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1686 core_scsi3_tpg_undepend_item(dest_tpg); 1687 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1688 goto out_unmap; 1689 } 1690 INIT_LIST_HEAD(&tidh_new->dest_list); 1691 tidh_new->dest_tpg = dest_tpg; 1692 tidh_new->dest_node_acl = dest_node_acl; 1693 tidh_new->dest_se_deve = dest_se_deve; 1694 1695 /* 1696 * Allocate, but do NOT add the registration for the 1697 * TransportID referenced SCSI Initiator port. This 1698 * done because of the following from spc4r17 in section 1699 * 6.14.3 wrt SPEC_I_PT: 1700 * 1701 * "If a registration fails for any initiator port (e.g., if th 1702 * logical unit does not have enough resources available to 1703 * hold the registration information), no registrations shall be 1704 * made, and the command shall be terminated with 1705 * CHECK CONDITION status." 1706 * 1707 * That means we call __core_scsi3_alloc_registration() here, 1708 * and then call __core_scsi3_add_registration() in the 1709 * 2nd loop which will never fail. 1710 */ 1711 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1712 dest_node_acl, dest_se_deve, iport_ptr, 1713 sa_res_key, all_tg_pt, aptpl); 1714 if (!dest_pr_reg) { 1715 core_scsi3_lunacl_undepend_item(dest_se_deve); 1716 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1717 core_scsi3_tpg_undepend_item(dest_tpg); 1718 kfree(tidh_new); 1719 ret = TCM_INVALID_PARAMETER_LIST; 1720 goto out_unmap; 1721 } 1722 tidh_new->dest_pr_reg = dest_pr_reg; 1723 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1724 1725 ptr += tid_len; 1726 tpdl -= tid_len; 1727 tid_len = 0; 1728 1729 } 1730 1731 transport_kunmap_data_sg(cmd); 1732 1733 /* 1734 * Go ahead and create a registrations from tid_dest_list for the 1735 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1736 * and dest_se_deve. 1737 * 1738 * The SA Reservation Key from the PROUT is set for the 1739 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1740 * means that the TransportID Initiator port will be 1741 * registered on all of the target ports in the SCSI target device 1742 * ALL_TG_PT=0 means the registration will only be for the 1743 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1744 * was received. 1745 */ 1746 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1747 dest_tpg = tidh->dest_tpg; 1748 dest_node_acl = tidh->dest_node_acl; 1749 dest_se_deve = tidh->dest_se_deve; 1750 dest_pr_reg = tidh->dest_pr_reg; 1751 dest_local_nexus = tidh->dest_local_nexus; 1752 1753 list_del(&tidh->dest_list); 1754 kfree(tidh); 1755 1756 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1757 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN); 1758 1759 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1760 dest_pr_reg, 0, 0); 1761 1762 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1763 " registered Transport ID for Node: %s%s Mapped LUN:" 1764 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1765 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun); 1766 1767 if (dest_local_nexus) 1768 continue; 1769 1770 core_scsi3_lunacl_undepend_item(dest_se_deve); 1771 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1772 core_scsi3_tpg_undepend_item(dest_tpg); 1773 } 1774 1775 return 0; 1776 out_unmap: 1777 transport_kunmap_data_sg(cmd); 1778 out: 1779 /* 1780 * For the failure case, release everything from tid_dest_list 1781 * including *dest_pr_reg and the configfs dependances.. 1782 */ 1783 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1784 dest_tpg = tidh->dest_tpg; 1785 dest_node_acl = tidh->dest_node_acl; 1786 dest_se_deve = tidh->dest_se_deve; 1787 dest_pr_reg = tidh->dest_pr_reg; 1788 dest_local_nexus = tidh->dest_local_nexus; 1789 1790 list_del(&tidh->dest_list); 1791 kfree(tidh); 1792 /* 1793 * Release any extra ALL_TG_PT=1 registrations for 1794 * the SPEC_I_PT=1 case. 1795 */ 1796 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1797 &dest_pr_reg->pr_reg_atp_list, 1798 pr_reg_atp_mem_list) { 1799 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1800 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1801 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1802 } 1803 1804 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1805 1806 if (dest_local_nexus) 1807 continue; 1808 1809 core_scsi3_lunacl_undepend_item(dest_se_deve); 1810 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1811 core_scsi3_tpg_undepend_item(dest_tpg); 1812 } 1813 return ret; 1814 } 1815 1816 static int core_scsi3_update_aptpl_buf( 1817 struct se_device *dev, 1818 unsigned char *buf, 1819 u32 pr_aptpl_buf_len) 1820 { 1821 struct se_lun *lun; 1822 struct se_portal_group *tpg; 1823 struct t10_pr_registration *pr_reg; 1824 unsigned char tmp[512], isid_buf[32]; 1825 ssize_t len = 0; 1826 int reg_count = 0; 1827 int ret = 0; 1828 1829 spin_lock(&dev->dev_reservation_lock); 1830 spin_lock(&dev->t10_pr.registration_lock); 1831 /* 1832 * Walk the registration list.. 1833 */ 1834 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 1835 pr_reg_list) { 1836 1837 tmp[0] = '\0'; 1838 isid_buf[0] = '\0'; 1839 tpg = pr_reg->pr_reg_nacl->se_tpg; 1840 lun = pr_reg->pr_reg_tg_pt_lun; 1841 /* 1842 * Write out any ISID value to APTPL metadata that was included 1843 * in the original registration. 1844 */ 1845 if (pr_reg->isid_present_at_reg) 1846 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1847 pr_reg->pr_reg_isid); 1848 /* 1849 * Include special metadata if the pr_reg matches the 1850 * reservation holder. 1851 */ 1852 if (dev->dev_pr_res_holder == pr_reg) { 1853 snprintf(tmp, 512, "PR_REG_START: %d" 1854 "\ninitiator_fabric=%s\n" 1855 "initiator_node=%s\n%s" 1856 "sa_res_key=%llu\n" 1857 "res_holder=1\nres_type=%02x\n" 1858 "res_scope=%02x\nres_all_tg_pt=%d\n" 1859 "mapped_lun=%u\n", reg_count, 1860 tpg->se_tpg_tfo->get_fabric_name(), 1861 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1862 pr_reg->pr_res_key, pr_reg->pr_res_type, 1863 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1864 pr_reg->pr_res_mapped_lun); 1865 } else { 1866 snprintf(tmp, 512, "PR_REG_START: %d\n" 1867 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1868 "sa_res_key=%llu\nres_holder=0\n" 1869 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1870 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1871 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1872 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1873 pr_reg->pr_res_mapped_lun); 1874 } 1875 1876 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1877 pr_err("Unable to update renaming" 1878 " APTPL metadata\n"); 1879 ret = -EMSGSIZE; 1880 goto out; 1881 } 1882 len += sprintf(buf+len, "%s", tmp); 1883 1884 /* 1885 * Include information about the associated SCSI target port. 1886 */ 1887 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1888 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1889 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1890 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1891 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1892 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1893 1894 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1895 pr_err("Unable to update renaming" 1896 " APTPL metadata\n"); 1897 ret = -EMSGSIZE; 1898 goto out; 1899 } 1900 len += sprintf(buf+len, "%s", tmp); 1901 reg_count++; 1902 } 1903 1904 if (!reg_count) 1905 len += sprintf(buf+len, "No Registrations or Reservations"); 1906 1907 out: 1908 spin_unlock(&dev->t10_pr.registration_lock); 1909 spin_unlock(&dev->dev_reservation_lock); 1910 1911 return ret; 1912 } 1913 1914 static int __core_scsi3_write_aptpl_to_file( 1915 struct se_device *dev, 1916 unsigned char *buf) 1917 { 1918 struct t10_wwn *wwn = &dev->t10_wwn; 1919 struct file *file; 1920 int flags = O_RDWR | O_CREAT | O_TRUNC; 1921 char path[512]; 1922 u32 pr_aptpl_buf_len; 1923 int ret; 1924 1925 memset(path, 0, 512); 1926 1927 if (strlen(&wwn->unit_serial[0]) >= 512) { 1928 pr_err("WWN value for struct se_device does not fit" 1929 " into path buffer\n"); 1930 return -EMSGSIZE; 1931 } 1932 1933 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 1934 file = filp_open(path, flags, 0600); 1935 if (IS_ERR(file)) { 1936 pr_err("filp_open(%s) for APTPL metadata" 1937 " failed\n", path); 1938 return PTR_ERR(file); 1939 } 1940 1941 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */ 1942 1943 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0); 1944 1945 if (ret < 0) 1946 pr_debug("Error writing APTPL metadata file: %s\n", path); 1947 fput(file); 1948 1949 return (ret < 0) ? -EIO : 0; 1950 } 1951 1952 /* 1953 * Clear the APTPL metadata if APTPL has been disabled, otherwise 1954 * write out the updated metadata to struct file for this SCSI device. 1955 */ 1956 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) 1957 { 1958 unsigned char *buf; 1959 int rc; 1960 1961 if (!aptpl) { 1962 char *null_buf = "No Registrations or Reservations\n"; 1963 1964 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf); 1965 dev->t10_pr.pr_aptpl_active = 0; 1966 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); 1967 1968 if (rc) 1969 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1970 1971 return 0; 1972 } 1973 1974 buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL); 1975 if (!buf) 1976 return TCM_OUT_OF_RESOURCES; 1977 1978 rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN); 1979 if (rc < 0) { 1980 kfree(buf); 1981 return TCM_OUT_OF_RESOURCES; 1982 } 1983 1984 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 1985 if (rc != 0) { 1986 pr_err("SPC-3 PR: Could not update APTPL\n"); 1987 kfree(buf); 1988 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1989 } 1990 dev->t10_pr.pr_aptpl_active = 1; 1991 kfree(buf); 1992 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 1993 return 0; 1994 } 1995 1996 static sense_reason_t 1997 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 1998 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 1999 { 2000 struct se_session *se_sess = cmd->se_sess; 2001 struct se_device *dev = cmd->se_dev; 2002 struct se_dev_entry *se_deve; 2003 struct se_lun *se_lun = cmd->se_lun; 2004 struct se_portal_group *se_tpg; 2005 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2006 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2007 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2008 sense_reason_t ret = TCM_NO_SENSE; 2009 int pr_holder = 0, type; 2010 2011 if (!se_sess || !se_lun) { 2012 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2013 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2014 } 2015 se_tpg = se_sess->se_tpg; 2016 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2017 2018 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2019 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2020 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2021 PR_REG_ISID_LEN); 2022 isid_ptr = &isid_buf[0]; 2023 } 2024 /* 2025 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2026 */ 2027 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2028 if (!pr_reg) { 2029 if (res_key) { 2030 pr_warn("SPC-3 PR: Reservation Key non-zero" 2031 " for SA REGISTER, returning CONFLICT\n"); 2032 return TCM_RESERVATION_CONFLICT; 2033 } 2034 /* 2035 * Do nothing but return GOOD status. 2036 */ 2037 if (!sa_res_key) 2038 return 0; 2039 2040 if (!spec_i_pt) { 2041 /* 2042 * Perform the Service Action REGISTER on the Initiator 2043 * Port Endpoint that the PRO was received from on the 2044 * Logical Unit of the SCSI device server. 2045 */ 2046 if (core_scsi3_alloc_registration(cmd->se_dev, 2047 se_sess->se_node_acl, se_deve, isid_ptr, 2048 sa_res_key, all_tg_pt, aptpl, 2049 register_type, 0)) { 2050 pr_err("Unable to allocate" 2051 " struct t10_pr_registration\n"); 2052 return TCM_INVALID_PARAMETER_LIST; 2053 } 2054 } else { 2055 /* 2056 * Register both the Initiator port that received 2057 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2058 * TransportID from Parameter list and loop through 2059 * fabric dependent parameter list while calling 2060 * logic from of core_scsi3_alloc_registration() for 2061 * each TransportID provided SCSI Initiator Port/Device 2062 */ 2063 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2064 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2065 if (ret != 0) 2066 return ret; 2067 } 2068 2069 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2070 } 2071 2072 /* ok, existing registration */ 2073 2074 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2075 pr_err("SPC-3 PR REGISTER: Received" 2076 " res_key: 0x%016Lx does not match" 2077 " existing SA REGISTER res_key:" 2078 " 0x%016Lx\n", res_key, 2079 pr_reg->pr_res_key); 2080 ret = TCM_RESERVATION_CONFLICT; 2081 goto out; 2082 } 2083 2084 if (spec_i_pt) { 2085 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2086 " set on a registered nexus\n"); 2087 ret = TCM_INVALID_PARAMETER_LIST; 2088 goto out; 2089 } 2090 2091 /* 2092 * An existing ALL_TG_PT=1 registration being released 2093 * must also set ALL_TG_PT=1 in the incoming PROUT. 2094 */ 2095 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2096 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2097 " registration exists, but ALL_TG_PT=1 bit not" 2098 " present in received PROUT\n"); 2099 ret = TCM_INVALID_CDB_FIELD; 2100 goto out; 2101 } 2102 2103 /* 2104 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2105 */ 2106 if (sa_res_key) { 2107 /* 2108 * Increment PRgeneration counter for struct se_device" 2109 * upon a successful REGISTER, see spc4r17 section 6.3.2 2110 * READ_KEYS service action. 2111 */ 2112 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2113 pr_reg->pr_res_key = sa_res_key; 2114 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2115 " Key for %s to: 0x%016Lx PRgeneration:" 2116 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2117 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2118 pr_reg->pr_reg_nacl->initiatorname, 2119 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2120 2121 } else { 2122 /* 2123 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2124 */ 2125 type = pr_reg->pr_res_type; 2126 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2127 pr_reg); 2128 if (pr_holder < 0) { 2129 ret = TCM_RESERVATION_CONFLICT; 2130 goto out; 2131 } 2132 2133 spin_lock(&pr_tmpl->registration_lock); 2134 /* 2135 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2136 * and matching pr_res_key. 2137 */ 2138 if (pr_reg->pr_reg_all_tg_pt) { 2139 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2140 &pr_tmpl->registration_list, 2141 pr_reg_list) { 2142 2143 if (!pr_reg_p->pr_reg_all_tg_pt) 2144 continue; 2145 if (pr_reg_p->pr_res_key != res_key) 2146 continue; 2147 if (pr_reg == pr_reg_p) 2148 continue; 2149 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2150 pr_reg_p->pr_reg_nacl->initiatorname)) 2151 continue; 2152 2153 __core_scsi3_free_registration(dev, 2154 pr_reg_p, NULL, 0); 2155 } 2156 } 2157 2158 /* 2159 * Release the calling I_T Nexus registration now.. 2160 */ 2161 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2162 pr_reg = NULL; 2163 2164 /* 2165 * From spc4r17, section 5.7.11.3 Unregistering 2166 * 2167 * If the persistent reservation is a registrants only 2168 * type, the device server shall establish a unit 2169 * attention condition for the initiator port associated 2170 * with every registered I_T nexus except for the I_T 2171 * nexus on which the PERSISTENT RESERVE OUT command was 2172 * received, with the additional sense code set to 2173 * RESERVATIONS RELEASED. 2174 */ 2175 if (pr_holder && 2176 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2177 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2178 list_for_each_entry(pr_reg_p, 2179 &pr_tmpl->registration_list, 2180 pr_reg_list) { 2181 2182 core_scsi3_ua_allocate( 2183 pr_reg_p->pr_reg_nacl, 2184 pr_reg_p->pr_res_mapped_lun, 2185 0x2A, 2186 ASCQ_2AH_RESERVATIONS_RELEASED); 2187 } 2188 } 2189 2190 spin_unlock(&pr_tmpl->registration_lock); 2191 } 2192 2193 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2194 2195 out: 2196 if (pr_reg) 2197 core_scsi3_put_pr_reg(pr_reg); 2198 return ret; 2199 } 2200 2201 unsigned char *core_scsi3_pr_dump_type(int type) 2202 { 2203 switch (type) { 2204 case PR_TYPE_WRITE_EXCLUSIVE: 2205 return "Write Exclusive Access"; 2206 case PR_TYPE_EXCLUSIVE_ACCESS: 2207 return "Exclusive Access"; 2208 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2209 return "Write Exclusive Access, Registrants Only"; 2210 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2211 return "Exclusive Access, Registrants Only"; 2212 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2213 return "Write Exclusive Access, All Registrants"; 2214 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2215 return "Exclusive Access, All Registrants"; 2216 default: 2217 break; 2218 } 2219 2220 return "Unknown SPC-3 PR Type"; 2221 } 2222 2223 static sense_reason_t 2224 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2225 { 2226 struct se_device *dev = cmd->se_dev; 2227 struct se_session *se_sess = cmd->se_sess; 2228 struct se_lun *se_lun = cmd->se_lun; 2229 struct t10_pr_registration *pr_reg, *pr_res_holder; 2230 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2231 char i_buf[PR_REG_ISID_ID_LEN]; 2232 sense_reason_t ret; 2233 2234 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2235 2236 if (!se_sess || !se_lun) { 2237 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2238 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2239 } 2240 /* 2241 * Locate the existing *pr_reg via struct se_node_acl pointers 2242 */ 2243 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2244 se_sess); 2245 if (!pr_reg) { 2246 pr_err("SPC-3 PR: Unable to locate" 2247 " PR_REGISTERED *pr_reg for RESERVE\n"); 2248 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2249 } 2250 /* 2251 * From spc4r17 Section 5.7.9: Reserving: 2252 * 2253 * An application client creates a persistent reservation by issuing 2254 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2255 * a registered I_T nexus with the following parameters: 2256 * a) RESERVATION KEY set to the value of the reservation key that is 2257 * registered with the logical unit for the I_T nexus; and 2258 */ 2259 if (res_key != pr_reg->pr_res_key) { 2260 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2261 " does not match existing SA REGISTER res_key:" 2262 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2263 ret = TCM_RESERVATION_CONFLICT; 2264 goto out_put_pr_reg; 2265 } 2266 /* 2267 * From spc4r17 Section 5.7.9: Reserving: 2268 * 2269 * From above: 2270 * b) TYPE field and SCOPE field set to the persistent reservation 2271 * being created. 2272 * 2273 * Only one persistent reservation is allowed at a time per logical unit 2274 * and that persistent reservation has a scope of LU_SCOPE. 2275 */ 2276 if (scope != PR_SCOPE_LU_SCOPE) { 2277 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2278 ret = TCM_INVALID_PARAMETER_LIST; 2279 goto out_put_pr_reg; 2280 } 2281 /* 2282 * See if we have an existing PR reservation holder pointer at 2283 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2284 * *pr_res_holder. 2285 */ 2286 spin_lock(&dev->dev_reservation_lock); 2287 pr_res_holder = dev->dev_pr_res_holder; 2288 if (pr_res_holder) { 2289 int pr_res_type = pr_res_holder->pr_res_type; 2290 /* 2291 * From spc4r17 Section 5.7.9: Reserving: 2292 * 2293 * If the device server receives a PERSISTENT RESERVE OUT 2294 * command from an I_T nexus other than a persistent reservation 2295 * holder (see 5.7.10) that attempts to create a persistent 2296 * reservation when a persistent reservation already exists for 2297 * the logical unit, then the command shall be completed with 2298 * RESERVATION CONFLICT status. 2299 */ 2300 if ((pr_res_holder != pr_reg) && 2301 (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2302 (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2303 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2304 pr_err("SPC-3 PR: Attempted RESERVE from" 2305 " [%s]: %s while reservation already held by" 2306 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2307 cmd->se_tfo->get_fabric_name(), 2308 se_sess->se_node_acl->initiatorname, 2309 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2310 pr_res_holder->pr_reg_nacl->initiatorname); 2311 2312 spin_unlock(&dev->dev_reservation_lock); 2313 ret = TCM_RESERVATION_CONFLICT; 2314 goto out_put_pr_reg; 2315 } 2316 /* 2317 * From spc4r17 Section 5.7.9: Reserving: 2318 * 2319 * If a persistent reservation holder attempts to modify the 2320 * type or scope of an existing persistent reservation, the 2321 * command shall be completed with RESERVATION CONFLICT status. 2322 */ 2323 if ((pr_res_holder->pr_res_type != type) || 2324 (pr_res_holder->pr_res_scope != scope)) { 2325 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2326 pr_err("SPC-3 PR: Attempted RESERVE from" 2327 " [%s]: %s trying to change TYPE and/or SCOPE," 2328 " while reservation already held by [%s]: %s," 2329 " returning RESERVATION_CONFLICT\n", 2330 cmd->se_tfo->get_fabric_name(), 2331 se_sess->se_node_acl->initiatorname, 2332 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2333 pr_res_holder->pr_reg_nacl->initiatorname); 2334 2335 spin_unlock(&dev->dev_reservation_lock); 2336 ret = TCM_RESERVATION_CONFLICT; 2337 goto out_put_pr_reg; 2338 } 2339 /* 2340 * From spc4r17 Section 5.7.9: Reserving: 2341 * 2342 * If the device server receives a PERSISTENT RESERVE OUT 2343 * command with RESERVE service action where the TYPE field and 2344 * the SCOPE field contain the same values as the existing type 2345 * and scope from a persistent reservation holder, it shall not 2346 * make any change to the existing persistent reservation and 2347 * shall completethe command with GOOD status. 2348 */ 2349 spin_unlock(&dev->dev_reservation_lock); 2350 ret = 0; 2351 goto out_put_pr_reg; 2352 } 2353 /* 2354 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2355 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2356 */ 2357 pr_reg->pr_res_scope = scope; 2358 pr_reg->pr_res_type = type; 2359 pr_reg->pr_res_holder = 1; 2360 dev->dev_pr_res_holder = pr_reg; 2361 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2362 2363 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2364 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2365 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2366 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2367 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2368 cmd->se_tfo->get_fabric_name(), 2369 se_sess->se_node_acl->initiatorname, 2370 i_buf); 2371 spin_unlock(&dev->dev_reservation_lock); 2372 2373 if (pr_tmpl->pr_aptpl_active) 2374 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2375 2376 ret = 0; 2377 out_put_pr_reg: 2378 core_scsi3_put_pr_reg(pr_reg); 2379 return ret; 2380 } 2381 2382 static sense_reason_t 2383 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2384 u64 res_key) 2385 { 2386 switch (type) { 2387 case PR_TYPE_WRITE_EXCLUSIVE: 2388 case PR_TYPE_EXCLUSIVE_ACCESS: 2389 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2390 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2391 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2392 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2393 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2394 default: 2395 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2396 " 0x%02x\n", type); 2397 return TCM_INVALID_CDB_FIELD; 2398 } 2399 } 2400 2401 /* 2402 * Called with struct se_device->dev_reservation_lock held. 2403 */ 2404 static void __core_scsi3_complete_pro_release( 2405 struct se_device *dev, 2406 struct se_node_acl *se_nacl, 2407 struct t10_pr_registration *pr_reg, 2408 int explicit, 2409 int unreg) 2410 { 2411 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2412 char i_buf[PR_REG_ISID_ID_LEN]; 2413 int pr_res_type = 0, pr_res_scope = 0; 2414 2415 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2416 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2417 /* 2418 * Go ahead and release the current PR reservation holder. 2419 * If an All Registrants reservation is currently active and 2420 * a unregister operation is requested, replace the current 2421 * dev_pr_res_holder with another active registration. 2422 */ 2423 if (dev->dev_pr_res_holder) { 2424 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2425 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2426 dev->dev_pr_res_holder->pr_res_type = 0; 2427 dev->dev_pr_res_holder->pr_res_scope = 0; 2428 dev->dev_pr_res_holder->pr_res_holder = 0; 2429 dev->dev_pr_res_holder = NULL; 2430 } 2431 if (!unreg) 2432 goto out; 2433 2434 spin_lock(&dev->t10_pr.registration_lock); 2435 list_del_init(&pr_reg->pr_reg_list); 2436 /* 2437 * If the I_T nexus is a reservation holder, the persistent reservation 2438 * is of an all registrants type, and the I_T nexus is the last remaining 2439 * registered I_T nexus, then the device server shall also release the 2440 * persistent reservation. 2441 */ 2442 if (!list_empty(&dev->t10_pr.registration_list) && 2443 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2444 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2445 dev->dev_pr_res_holder = 2446 list_entry(dev->t10_pr.registration_list.next, 2447 struct t10_pr_registration, pr_reg_list); 2448 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2449 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2450 dev->dev_pr_res_holder->pr_res_holder = 1; 2451 } 2452 spin_unlock(&dev->t10_pr.registration_lock); 2453 out: 2454 if (!dev->dev_pr_res_holder) { 2455 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2456 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2457 tfo->get_fabric_name(), (explicit) ? "explicit" : 2458 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2459 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2460 } 2461 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2462 tfo->get_fabric_name(), se_nacl->initiatorname, 2463 i_buf); 2464 /* 2465 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2466 */ 2467 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2468 } 2469 2470 static sense_reason_t 2471 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2472 u64 res_key) 2473 { 2474 struct se_device *dev = cmd->se_dev; 2475 struct se_session *se_sess = cmd->se_sess; 2476 struct se_lun *se_lun = cmd->se_lun; 2477 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2478 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2479 int all_reg = 0; 2480 sense_reason_t ret = 0; 2481 2482 if (!se_sess || !se_lun) { 2483 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2484 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2485 } 2486 /* 2487 * Locate the existing *pr_reg via struct se_node_acl pointers 2488 */ 2489 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2490 if (!pr_reg) { 2491 pr_err("SPC-3 PR: Unable to locate" 2492 " PR_REGISTERED *pr_reg for RELEASE\n"); 2493 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2494 } 2495 /* 2496 * From spc4r17 Section 5.7.11.2 Releasing: 2497 * 2498 * If there is no persistent reservation or in response to a persistent 2499 * reservation release request from a registered I_T nexus that is not a 2500 * persistent reservation holder (see 5.7.10), the device server shall 2501 * do the following: 2502 * 2503 * a) Not release the persistent reservation, if any; 2504 * b) Not remove any registrations; and 2505 * c) Complete the command with GOOD status. 2506 */ 2507 spin_lock(&dev->dev_reservation_lock); 2508 pr_res_holder = dev->dev_pr_res_holder; 2509 if (!pr_res_holder) { 2510 /* 2511 * No persistent reservation, return GOOD status. 2512 */ 2513 spin_unlock(&dev->dev_reservation_lock); 2514 goto out_put_pr_reg; 2515 } 2516 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2517 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2518 all_reg = 1; 2519 2520 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2521 /* 2522 * Non 'All Registrants' PR Type cases.. 2523 * Release request from a registered I_T nexus that is not a 2524 * persistent reservation holder. return GOOD status. 2525 */ 2526 spin_unlock(&dev->dev_reservation_lock); 2527 goto out_put_pr_reg; 2528 } 2529 2530 /* 2531 * From spc4r17 Section 5.7.11.2 Releasing: 2532 * 2533 * Only the persistent reservation holder (see 5.7.10) is allowed to 2534 * release a persistent reservation. 2535 * 2536 * An application client releases the persistent reservation by issuing 2537 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2538 * an I_T nexus that is a persistent reservation holder with the 2539 * following parameters: 2540 * 2541 * a) RESERVATION KEY field set to the value of the reservation key 2542 * that is registered with the logical unit for the I_T nexus; 2543 */ 2544 if (res_key != pr_reg->pr_res_key) { 2545 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2546 " does not match existing SA REGISTER res_key:" 2547 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2548 spin_unlock(&dev->dev_reservation_lock); 2549 ret = TCM_RESERVATION_CONFLICT; 2550 goto out_put_pr_reg; 2551 } 2552 /* 2553 * From spc4r17 Section 5.7.11.2 Releasing and above: 2554 * 2555 * b) TYPE field and SCOPE field set to match the persistent 2556 * reservation being released. 2557 */ 2558 if ((pr_res_holder->pr_res_type != type) || 2559 (pr_res_holder->pr_res_scope != scope)) { 2560 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2561 pr_err("SPC-3 PR RELEASE: Attempted to release" 2562 " reservation from [%s]: %s with different TYPE " 2563 "and/or SCOPE while reservation already held by" 2564 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2565 cmd->se_tfo->get_fabric_name(), 2566 se_sess->se_node_acl->initiatorname, 2567 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2568 pr_res_holder->pr_reg_nacl->initiatorname); 2569 2570 spin_unlock(&dev->dev_reservation_lock); 2571 ret = TCM_RESERVATION_CONFLICT; 2572 goto out_put_pr_reg; 2573 } 2574 /* 2575 * In response to a persistent reservation release request from the 2576 * persistent reservation holder the device server shall perform a 2577 * release by doing the following as an uninterrupted series of actions: 2578 * a) Release the persistent reservation; 2579 * b) Not remove any registration(s); 2580 * c) If the released persistent reservation is a registrants only type 2581 * or all registrants type persistent reservation, 2582 * the device server shall establish a unit attention condition for 2583 * the initiator port associated with every regis- 2584 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2585 * RESERVE OUT command with RELEASE service action was received, 2586 * with the additional sense code set to RESERVATIONS RELEASED; and 2587 * d) If the persistent reservation is of any other type, the device 2588 * server shall not establish a unit attention condition. 2589 */ 2590 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2591 pr_reg, 1, 0); 2592 2593 spin_unlock(&dev->dev_reservation_lock); 2594 2595 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2596 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2597 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2598 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2599 /* 2600 * If no UNIT ATTENTION conditions will be established for 2601 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2602 * go ahead and check for APTPL=1 update+write below 2603 */ 2604 goto write_aptpl; 2605 } 2606 2607 spin_lock(&pr_tmpl->registration_lock); 2608 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2609 pr_reg_list) { 2610 /* 2611 * Do not establish a UNIT ATTENTION condition 2612 * for the calling I_T Nexus 2613 */ 2614 if (pr_reg_p == pr_reg) 2615 continue; 2616 2617 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2618 pr_reg_p->pr_res_mapped_lun, 2619 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2620 } 2621 spin_unlock(&pr_tmpl->registration_lock); 2622 2623 write_aptpl: 2624 if (pr_tmpl->pr_aptpl_active) 2625 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2626 2627 out_put_pr_reg: 2628 core_scsi3_put_pr_reg(pr_reg); 2629 return ret; 2630 } 2631 2632 static sense_reason_t 2633 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2634 { 2635 struct se_device *dev = cmd->se_dev; 2636 struct se_node_acl *pr_reg_nacl; 2637 struct se_session *se_sess = cmd->se_sess; 2638 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2639 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2640 u32 pr_res_mapped_lun = 0; 2641 int calling_it_nexus = 0; 2642 /* 2643 * Locate the existing *pr_reg via struct se_node_acl pointers 2644 */ 2645 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2646 se_sess->se_node_acl, se_sess); 2647 if (!pr_reg_n) { 2648 pr_err("SPC-3 PR: Unable to locate" 2649 " PR_REGISTERED *pr_reg for CLEAR\n"); 2650 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2651 } 2652 /* 2653 * From spc4r17 section 5.7.11.6, Clearing: 2654 * 2655 * Any application client may release the persistent reservation and 2656 * remove all registrations from a device server by issuing a 2657 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2658 * registered I_T nexus with the following parameter: 2659 * 2660 * a) RESERVATION KEY field set to the value of the reservation key 2661 * that is registered with the logical unit for the I_T nexus. 2662 */ 2663 if (res_key != pr_reg_n->pr_res_key) { 2664 pr_err("SPC-3 PR REGISTER: Received" 2665 " res_key: 0x%016Lx does not match" 2666 " existing SA REGISTER res_key:" 2667 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2668 core_scsi3_put_pr_reg(pr_reg_n); 2669 return TCM_RESERVATION_CONFLICT; 2670 } 2671 /* 2672 * a) Release the persistent reservation, if any; 2673 */ 2674 spin_lock(&dev->dev_reservation_lock); 2675 pr_res_holder = dev->dev_pr_res_holder; 2676 if (pr_res_holder) { 2677 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2678 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2679 pr_res_holder, 0, 0); 2680 } 2681 spin_unlock(&dev->dev_reservation_lock); 2682 /* 2683 * b) Remove all registration(s) (see spc4r17 5.7.7); 2684 */ 2685 spin_lock(&pr_tmpl->registration_lock); 2686 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2687 &pr_tmpl->registration_list, pr_reg_list) { 2688 2689 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2690 pr_reg_nacl = pr_reg->pr_reg_nacl; 2691 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2692 __core_scsi3_free_registration(dev, pr_reg, NULL, 2693 calling_it_nexus); 2694 /* 2695 * e) Establish a unit attention condition for the initiator 2696 * port associated with every registered I_T nexus other 2697 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2698 * command with CLEAR service action was received, with the 2699 * additional sense code set to RESERVATIONS PREEMPTED. 2700 */ 2701 if (!calling_it_nexus) 2702 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2703 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2704 } 2705 spin_unlock(&pr_tmpl->registration_lock); 2706 2707 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2708 cmd->se_tfo->get_fabric_name()); 2709 2710 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2711 2712 core_scsi3_pr_generation(dev); 2713 return 0; 2714 } 2715 2716 /* 2717 * Called with struct se_device->dev_reservation_lock held. 2718 */ 2719 static void __core_scsi3_complete_pro_preempt( 2720 struct se_device *dev, 2721 struct t10_pr_registration *pr_reg, 2722 struct list_head *preempt_and_abort_list, 2723 int type, 2724 int scope, 2725 enum preempt_type preempt_type) 2726 { 2727 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2728 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2729 char i_buf[PR_REG_ISID_ID_LEN]; 2730 2731 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2732 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2733 /* 2734 * Do an implicit RELEASE of the existing reservation. 2735 */ 2736 if (dev->dev_pr_res_holder) 2737 __core_scsi3_complete_pro_release(dev, nacl, 2738 dev->dev_pr_res_holder, 0, 0); 2739 2740 dev->dev_pr_res_holder = pr_reg; 2741 pr_reg->pr_res_holder = 1; 2742 pr_reg->pr_res_type = type; 2743 pr_reg->pr_res_scope = scope; 2744 2745 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2746 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2747 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2748 core_scsi3_pr_dump_type(type), 2749 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2750 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2751 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2752 nacl->initiatorname, i_buf); 2753 /* 2754 * For PREEMPT_AND_ABORT, add the preempting reservation's 2755 * struct t10_pr_registration to the list that will be compared 2756 * against received CDBs.. 2757 */ 2758 if (preempt_and_abort_list) 2759 list_add_tail(&pr_reg->pr_reg_abort_list, 2760 preempt_and_abort_list); 2761 } 2762 2763 static void core_scsi3_release_preempt_and_abort( 2764 struct list_head *preempt_and_abort_list, 2765 struct t10_pr_registration *pr_reg_holder) 2766 { 2767 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2768 2769 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2770 pr_reg_abort_list) { 2771 2772 list_del(&pr_reg->pr_reg_abort_list); 2773 if (pr_reg_holder == pr_reg) 2774 continue; 2775 if (pr_reg->pr_res_holder) { 2776 pr_warn("pr_reg->pr_res_holder still set\n"); 2777 continue; 2778 } 2779 2780 pr_reg->pr_reg_deve = NULL; 2781 pr_reg->pr_reg_nacl = NULL; 2782 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2783 } 2784 } 2785 2786 static sense_reason_t 2787 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2788 u64 sa_res_key, enum preempt_type preempt_type) 2789 { 2790 struct se_device *dev = cmd->se_dev; 2791 struct se_node_acl *pr_reg_nacl; 2792 struct se_session *se_sess = cmd->se_sess; 2793 LIST_HEAD(preempt_and_abort_list); 2794 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2795 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2796 u32 pr_res_mapped_lun = 0; 2797 int all_reg = 0, calling_it_nexus = 0; 2798 bool sa_res_key_unmatched = sa_res_key != 0; 2799 int prh_type = 0, prh_scope = 0; 2800 2801 if (!se_sess) 2802 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2803 2804 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2805 se_sess); 2806 if (!pr_reg_n) { 2807 pr_err("SPC-3 PR: Unable to locate" 2808 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2809 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2810 return TCM_RESERVATION_CONFLICT; 2811 } 2812 if (pr_reg_n->pr_res_key != res_key) { 2813 core_scsi3_put_pr_reg(pr_reg_n); 2814 return TCM_RESERVATION_CONFLICT; 2815 } 2816 if (scope != PR_SCOPE_LU_SCOPE) { 2817 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2818 core_scsi3_put_pr_reg(pr_reg_n); 2819 return TCM_INVALID_PARAMETER_LIST; 2820 } 2821 2822 spin_lock(&dev->dev_reservation_lock); 2823 pr_res_holder = dev->dev_pr_res_holder; 2824 if (pr_res_holder && 2825 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2826 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2827 all_reg = 1; 2828 2829 if (!all_reg && !sa_res_key) { 2830 spin_unlock(&dev->dev_reservation_lock); 2831 core_scsi3_put_pr_reg(pr_reg_n); 2832 return TCM_INVALID_PARAMETER_LIST; 2833 } 2834 /* 2835 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2836 * 2837 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2838 * persistent reservation holder or there is no persistent reservation 2839 * holder (i.e., there is no persistent reservation), then the device 2840 * server shall perform a preempt by doing the following in an 2841 * uninterrupted series of actions. (See below..) 2842 */ 2843 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2844 /* 2845 * No existing or SA Reservation Key matching reservations.. 2846 * 2847 * PROUT SA PREEMPT with All Registrant type reservations are 2848 * allowed to be processed without a matching SA Reservation Key 2849 */ 2850 spin_lock(&pr_tmpl->registration_lock); 2851 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2852 &pr_tmpl->registration_list, pr_reg_list) { 2853 /* 2854 * Removing of registrations in non all registrants 2855 * type reservations without a matching SA reservation 2856 * key. 2857 * 2858 * a) Remove the registrations for all I_T nexuses 2859 * specified by the SERVICE ACTION RESERVATION KEY 2860 * field; 2861 * b) Ignore the contents of the SCOPE and TYPE fields; 2862 * c) Process tasks as defined in 5.7.1; and 2863 * d) Establish a unit attention condition for the 2864 * initiator port associated with every I_T nexus 2865 * that lost its registration other than the I_T 2866 * nexus on which the PERSISTENT RESERVE OUT command 2867 * was received, with the additional sense code set 2868 * to REGISTRATIONS PREEMPTED. 2869 */ 2870 if (!all_reg) { 2871 if (pr_reg->pr_res_key != sa_res_key) 2872 continue; 2873 sa_res_key_unmatched = false; 2874 2875 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2876 pr_reg_nacl = pr_reg->pr_reg_nacl; 2877 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2878 __core_scsi3_free_registration(dev, pr_reg, 2879 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2880 NULL, calling_it_nexus); 2881 } else { 2882 /* 2883 * Case for any existing all registrants type 2884 * reservation, follow logic in spc4r17 section 2885 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2886 * 2887 * For a ZERO SA Reservation key, release 2888 * all other registrations and do an implicit 2889 * release of active persistent reservation. 2890 * 2891 * For a non-ZERO SA Reservation key, only 2892 * release the matching reservation key from 2893 * registrations. 2894 */ 2895 if ((sa_res_key) && 2896 (pr_reg->pr_res_key != sa_res_key)) 2897 continue; 2898 sa_res_key_unmatched = false; 2899 2900 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2901 if (calling_it_nexus) 2902 continue; 2903 2904 pr_reg_nacl = pr_reg->pr_reg_nacl; 2905 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2906 __core_scsi3_free_registration(dev, pr_reg, 2907 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2908 NULL, 0); 2909 } 2910 if (!calling_it_nexus) 2911 core_scsi3_ua_allocate(pr_reg_nacl, 2912 pr_res_mapped_lun, 0x2A, 2913 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2914 } 2915 spin_unlock(&pr_tmpl->registration_lock); 2916 /* 2917 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2918 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2919 * RESERVATION KEY field to a value that does not match any 2920 * registered reservation key, then the device server shall 2921 * complete the command with RESERVATION CONFLICT status. 2922 */ 2923 if (sa_res_key_unmatched) { 2924 spin_unlock(&dev->dev_reservation_lock); 2925 core_scsi3_put_pr_reg(pr_reg_n); 2926 return TCM_RESERVATION_CONFLICT; 2927 } 2928 /* 2929 * For an existing all registrants type reservation 2930 * with a zero SA rservation key, preempt the existing 2931 * reservation with the new PR type and scope. 2932 */ 2933 if (pr_res_holder && all_reg && !(sa_res_key)) { 2934 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2935 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2936 type, scope, preempt_type); 2937 2938 if (preempt_type == PREEMPT_AND_ABORT) 2939 core_scsi3_release_preempt_and_abort( 2940 &preempt_and_abort_list, pr_reg_n); 2941 } 2942 spin_unlock(&dev->dev_reservation_lock); 2943 2944 if (pr_tmpl->pr_aptpl_active) 2945 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2946 2947 core_scsi3_put_pr_reg(pr_reg_n); 2948 core_scsi3_pr_generation(cmd->se_dev); 2949 return 0; 2950 } 2951 /* 2952 * The PREEMPTing SA reservation key matches that of the 2953 * existing persistent reservation, first, we check if 2954 * we are preempting our own reservation. 2955 * From spc4r17, section 5.7.11.4.3 Preempting 2956 * persistent reservations and registration handling 2957 * 2958 * If an all registrants persistent reservation is not 2959 * present, it is not an error for the persistent 2960 * reservation holder to preempt itself (i.e., a 2961 * PERSISTENT RESERVE OUT with a PREEMPT service action 2962 * or a PREEMPT AND ABORT service action with the 2963 * SERVICE ACTION RESERVATION KEY value equal to the 2964 * persistent reservation holder's reservation key that 2965 * is received from the persistent reservation holder). 2966 * In that case, the device server shall establish the 2967 * new persistent reservation and maintain the 2968 * registration. 2969 */ 2970 prh_type = pr_res_holder->pr_res_type; 2971 prh_scope = pr_res_holder->pr_res_scope; 2972 /* 2973 * If the SERVICE ACTION RESERVATION KEY field identifies a 2974 * persistent reservation holder (see 5.7.10), the device 2975 * server shall perform a preempt by doing the following as 2976 * an uninterrupted series of actions: 2977 * 2978 * a) Release the persistent reservation for the holder 2979 * identified by the SERVICE ACTION RESERVATION KEY field; 2980 */ 2981 if (pr_reg_n != pr_res_holder) 2982 __core_scsi3_complete_pro_release(dev, 2983 pr_res_holder->pr_reg_nacl, 2984 dev->dev_pr_res_holder, 0, 0); 2985 /* 2986 * b) Remove the registrations for all I_T nexuses identified 2987 * by the SERVICE ACTION RESERVATION KEY field, except the 2988 * I_T nexus that is being used for the PERSISTENT RESERVE 2989 * OUT command. If an all registrants persistent reservation 2990 * is present and the SERVICE ACTION RESERVATION KEY field 2991 * is set to zero, then all registrations shall be removed 2992 * except for that of the I_T nexus that is being used for 2993 * the PERSISTENT RESERVE OUT command; 2994 */ 2995 spin_lock(&pr_tmpl->registration_lock); 2996 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2997 &pr_tmpl->registration_list, pr_reg_list) { 2998 2999 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3000 if (calling_it_nexus) 3001 continue; 3002 3003 if (pr_reg->pr_res_key != sa_res_key) 3004 continue; 3005 3006 pr_reg_nacl = pr_reg->pr_reg_nacl; 3007 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3008 __core_scsi3_free_registration(dev, pr_reg, 3009 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3010 calling_it_nexus); 3011 /* 3012 * e) Establish a unit attention condition for the initiator 3013 * port associated with every I_T nexus that lost its 3014 * persistent reservation and/or registration, with the 3015 * additional sense code set to REGISTRATIONS PREEMPTED; 3016 */ 3017 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3018 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3019 } 3020 spin_unlock(&pr_tmpl->registration_lock); 3021 /* 3022 * c) Establish a persistent reservation for the preempting 3023 * I_T nexus using the contents of the SCOPE and TYPE fields; 3024 */ 3025 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3026 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3027 type, scope, preempt_type); 3028 /* 3029 * d) Process tasks as defined in 5.7.1; 3030 * e) See above.. 3031 * f) If the type or scope has changed, then for every I_T nexus 3032 * whose reservation key was not removed, except for the I_T 3033 * nexus on which the PERSISTENT RESERVE OUT command was 3034 * received, the device server shall establish a unit 3035 * attention condition for the initiator port associated with 3036 * that I_T nexus, with the additional sense code set to 3037 * RESERVATIONS RELEASED. If the type or scope have not 3038 * changed, then no unit attention condition(s) shall be 3039 * established for this reason. 3040 */ 3041 if ((prh_type != type) || (prh_scope != scope)) { 3042 spin_lock(&pr_tmpl->registration_lock); 3043 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3044 &pr_tmpl->registration_list, pr_reg_list) { 3045 3046 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3047 if (calling_it_nexus) 3048 continue; 3049 3050 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3051 pr_reg->pr_res_mapped_lun, 0x2A, 3052 ASCQ_2AH_RESERVATIONS_RELEASED); 3053 } 3054 spin_unlock(&pr_tmpl->registration_lock); 3055 } 3056 spin_unlock(&dev->dev_reservation_lock); 3057 /* 3058 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3059 * All received CDBs for the matching existing reservation and 3060 * registrations undergo ABORT_TASK logic. 3061 * 3062 * From there, core_scsi3_release_preempt_and_abort() will 3063 * release every registration in the list (which have already 3064 * been removed from the primary pr_reg list), except the 3065 * new persistent reservation holder, the calling Initiator Port. 3066 */ 3067 if (preempt_type == PREEMPT_AND_ABORT) { 3068 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3069 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3070 pr_reg_n); 3071 } 3072 3073 if (pr_tmpl->pr_aptpl_active) 3074 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3075 3076 core_scsi3_put_pr_reg(pr_reg_n); 3077 core_scsi3_pr_generation(cmd->se_dev); 3078 return 0; 3079 } 3080 3081 static sense_reason_t 3082 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3083 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3084 { 3085 switch (type) { 3086 case PR_TYPE_WRITE_EXCLUSIVE: 3087 case PR_TYPE_EXCLUSIVE_ACCESS: 3088 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3089 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3090 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3091 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3092 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3093 sa_res_key, preempt_type); 3094 default: 3095 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3096 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3097 return TCM_INVALID_CDB_FIELD; 3098 } 3099 } 3100 3101 3102 static sense_reason_t 3103 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3104 u64 sa_res_key, int aptpl, int unreg) 3105 { 3106 struct se_session *se_sess = cmd->se_sess; 3107 struct se_device *dev = cmd->se_dev; 3108 struct se_dev_entry *dest_se_deve = NULL; 3109 struct se_lun *se_lun = cmd->se_lun; 3110 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3111 struct se_port *se_port; 3112 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3113 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3114 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3115 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3116 unsigned char *buf; 3117 unsigned char *initiator_str; 3118 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3119 u32 tid_len, tmp_tid_len; 3120 int new_reg = 0, type, scope, matching_iname; 3121 sense_reason_t ret; 3122 unsigned short rtpi; 3123 unsigned char proto_ident; 3124 3125 if (!se_sess || !se_lun) { 3126 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3127 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3128 } 3129 3130 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3131 se_tpg = se_sess->se_tpg; 3132 tf_ops = se_tpg->se_tpg_tfo; 3133 /* 3134 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3135 * Register behaviors for a REGISTER AND MOVE service action 3136 * 3137 * Locate the existing *pr_reg via struct se_node_acl pointers 3138 */ 3139 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3140 se_sess); 3141 if (!pr_reg) { 3142 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3143 " *pr_reg for REGISTER_AND_MOVE\n"); 3144 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3145 } 3146 /* 3147 * The provided reservation key much match the existing reservation key 3148 * provided during this initiator's I_T nexus registration. 3149 */ 3150 if (res_key != pr_reg->pr_res_key) { 3151 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3152 " res_key: 0x%016Lx does not match existing SA REGISTER" 3153 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3154 ret = TCM_RESERVATION_CONFLICT; 3155 goto out_put_pr_reg; 3156 } 3157 /* 3158 * The service active reservation key needs to be non zero 3159 */ 3160 if (!sa_res_key) { 3161 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3162 " sa_res_key\n"); 3163 ret = TCM_INVALID_PARAMETER_LIST; 3164 goto out_put_pr_reg; 3165 } 3166 3167 /* 3168 * Determine the Relative Target Port Identifier where the reservation 3169 * will be moved to for the TransportID containing SCSI initiator WWN 3170 * information. 3171 */ 3172 buf = transport_kmap_data_sg(cmd); 3173 if (!buf) { 3174 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3175 goto out_put_pr_reg; 3176 } 3177 3178 rtpi = (buf[18] & 0xff) << 8; 3179 rtpi |= buf[19] & 0xff; 3180 tid_len = (buf[20] & 0xff) << 24; 3181 tid_len |= (buf[21] & 0xff) << 16; 3182 tid_len |= (buf[22] & 0xff) << 8; 3183 tid_len |= buf[23] & 0xff; 3184 transport_kunmap_data_sg(cmd); 3185 buf = NULL; 3186 3187 if ((tid_len + 24) != cmd->data_length) { 3188 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3189 " does not equal CDB data_length: %u\n", tid_len, 3190 cmd->data_length); 3191 ret = TCM_INVALID_PARAMETER_LIST; 3192 goto out_put_pr_reg; 3193 } 3194 3195 spin_lock(&dev->se_port_lock); 3196 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3197 if (se_port->sep_rtpi != rtpi) 3198 continue; 3199 dest_se_tpg = se_port->sep_tpg; 3200 if (!dest_se_tpg) 3201 continue; 3202 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3203 if (!dest_tf_ops) 3204 continue; 3205 3206 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3207 spin_unlock(&dev->se_port_lock); 3208 3209 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3210 pr_err("core_scsi3_tpg_depend_item() failed" 3211 " for dest_se_tpg\n"); 3212 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3213 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3214 goto out_put_pr_reg; 3215 } 3216 3217 spin_lock(&dev->se_port_lock); 3218 break; 3219 } 3220 spin_unlock(&dev->se_port_lock); 3221 3222 if (!dest_se_tpg || !dest_tf_ops) { 3223 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3224 " fabric ops from Relative Target Port Identifier:" 3225 " %hu\n", rtpi); 3226 ret = TCM_INVALID_PARAMETER_LIST; 3227 goto out_put_pr_reg; 3228 } 3229 3230 buf = transport_kmap_data_sg(cmd); 3231 if (!buf) { 3232 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3233 goto out_put_pr_reg; 3234 } 3235 proto_ident = (buf[24] & 0x0f); 3236 3237 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3238 " 0x%02x\n", proto_ident); 3239 3240 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3241 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3242 " proto_ident: 0x%02x does not match ident: 0x%02x" 3243 " from fabric: %s\n", proto_ident, 3244 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3245 dest_tf_ops->get_fabric_name()); 3246 ret = TCM_INVALID_PARAMETER_LIST; 3247 goto out; 3248 } 3249 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3250 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3251 " containg a valid tpg_parse_pr_out_transport_id" 3252 " function pointer\n"); 3253 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3254 goto out; 3255 } 3256 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3257 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3258 if (!initiator_str) { 3259 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3260 " initiator_str from Transport ID\n"); 3261 ret = TCM_INVALID_PARAMETER_LIST; 3262 goto out; 3263 } 3264 3265 transport_kunmap_data_sg(cmd); 3266 buf = NULL; 3267 3268 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3269 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3270 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3271 iport_ptr : ""); 3272 /* 3273 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3274 * action specifies a TransportID that is the same as the initiator port 3275 * of the I_T nexus for the command received, then the command shall 3276 * be terminated with CHECK CONDITION status, with the sense key set to 3277 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3278 * IN PARAMETER LIST. 3279 */ 3280 pr_reg_nacl = pr_reg->pr_reg_nacl; 3281 matching_iname = (!strcmp(initiator_str, 3282 pr_reg_nacl->initiatorname)) ? 1 : 0; 3283 if (!matching_iname) 3284 goto after_iport_check; 3285 3286 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3287 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3288 " matches: %s on received I_T Nexus\n", initiator_str, 3289 pr_reg_nacl->initiatorname); 3290 ret = TCM_INVALID_PARAMETER_LIST; 3291 goto out; 3292 } 3293 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3294 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3295 " matches: %s %s on received I_T Nexus\n", 3296 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3297 pr_reg->pr_reg_isid); 3298 ret = TCM_INVALID_PARAMETER_LIST; 3299 goto out; 3300 } 3301 after_iport_check: 3302 /* 3303 * Locate the destination struct se_node_acl from the received Transport ID 3304 */ 3305 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3306 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3307 initiator_str); 3308 if (dest_node_acl) 3309 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3310 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3311 3312 if (!dest_node_acl) { 3313 pr_err("Unable to locate %s dest_node_acl for" 3314 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3315 initiator_str); 3316 ret = TCM_INVALID_PARAMETER_LIST; 3317 goto out; 3318 } 3319 3320 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3321 pr_err("core_scsi3_nodeacl_depend_item() for" 3322 " dest_node_acl\n"); 3323 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3324 dest_node_acl = NULL; 3325 ret = TCM_INVALID_PARAMETER_LIST; 3326 goto out; 3327 } 3328 3329 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3330 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3331 dest_node_acl->initiatorname); 3332 3333 /* 3334 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3335 * PORT IDENTIFIER. 3336 */ 3337 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3338 if (!dest_se_deve) { 3339 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3340 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3341 ret = TCM_INVALID_PARAMETER_LIST; 3342 goto out; 3343 } 3344 3345 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3346 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3347 atomic_dec_mb(&dest_se_deve->pr_ref_count); 3348 dest_se_deve = NULL; 3349 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3350 goto out; 3351 } 3352 3353 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3354 " ACL for dest_se_deve->mapped_lun: %u\n", 3355 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3356 dest_se_deve->mapped_lun); 3357 3358 /* 3359 * A persistent reservation needs to already existing in order to 3360 * successfully complete the REGISTER_AND_MOVE service action.. 3361 */ 3362 spin_lock(&dev->dev_reservation_lock); 3363 pr_res_holder = dev->dev_pr_res_holder; 3364 if (!pr_res_holder) { 3365 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3366 " currently held\n"); 3367 spin_unlock(&dev->dev_reservation_lock); 3368 ret = TCM_INVALID_CDB_FIELD; 3369 goto out; 3370 } 3371 /* 3372 * The received on I_T Nexus must be the reservation holder. 3373 * 3374 * From spc4r17 section 5.7.8 Table 50 -- 3375 * Register behaviors for a REGISTER AND MOVE service action 3376 */ 3377 if (pr_res_holder != pr_reg) { 3378 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3379 " Nexus is not reservation holder\n"); 3380 spin_unlock(&dev->dev_reservation_lock); 3381 ret = TCM_RESERVATION_CONFLICT; 3382 goto out; 3383 } 3384 /* 3385 * From spc4r17 section 5.7.8: registering and moving reservation 3386 * 3387 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3388 * action is received and the established persistent reservation is a 3389 * Write Exclusive - All Registrants type or Exclusive Access - 3390 * All Registrants type reservation, then the command shall be completed 3391 * with RESERVATION CONFLICT status. 3392 */ 3393 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3394 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3395 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3396 " reservation for type: %s\n", 3397 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3398 spin_unlock(&dev->dev_reservation_lock); 3399 ret = TCM_RESERVATION_CONFLICT; 3400 goto out; 3401 } 3402 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3403 /* 3404 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3405 */ 3406 type = pr_res_holder->pr_res_type; 3407 scope = pr_res_holder->pr_res_type; 3408 /* 3409 * c) Associate the reservation key specified in the SERVICE ACTION 3410 * RESERVATION KEY field with the I_T nexus specified as the 3411 * destination of the register and move, where: 3412 * A) The I_T nexus is specified by the TransportID and the 3413 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3414 * B) Regardless of the TransportID format used, the association for 3415 * the initiator port is based on either the initiator port name 3416 * (see 3.1.71) on SCSI transport protocols where port names are 3417 * required or the initiator port identifier (see 3.1.70) on SCSI 3418 * transport protocols where port names are not required; 3419 * d) Register the reservation key specified in the SERVICE ACTION 3420 * RESERVATION KEY field; 3421 * e) Retain the reservation key specified in the SERVICE ACTION 3422 * RESERVATION KEY field and associated information; 3423 * 3424 * Also, It is not an error for a REGISTER AND MOVE service action to 3425 * register an I_T nexus that is already registered with the same 3426 * reservation key or a different reservation key. 3427 */ 3428 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3429 iport_ptr); 3430 if (!dest_pr_reg) { 3431 if (core_scsi3_alloc_registration(cmd->se_dev, 3432 dest_node_acl, dest_se_deve, iport_ptr, 3433 sa_res_key, 0, aptpl, 2, 1)) { 3434 spin_unlock(&dev->dev_reservation_lock); 3435 ret = TCM_INVALID_PARAMETER_LIST; 3436 goto out; 3437 } 3438 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3439 iport_ptr); 3440 new_reg = 1; 3441 } 3442 /* 3443 * f) Release the persistent reservation for the persistent reservation 3444 * holder (i.e., the I_T nexus on which the 3445 */ 3446 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3447 dev->dev_pr_res_holder, 0, 0); 3448 /* 3449 * g) Move the persistent reservation to the specified I_T nexus using 3450 * the same scope and type as the persistent reservation released in 3451 * item f); and 3452 */ 3453 dev->dev_pr_res_holder = dest_pr_reg; 3454 dest_pr_reg->pr_res_holder = 1; 3455 dest_pr_reg->pr_res_type = type; 3456 pr_reg->pr_res_scope = scope; 3457 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3458 /* 3459 * Increment PRGeneration for existing registrations.. 3460 */ 3461 if (!new_reg) 3462 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3463 spin_unlock(&dev->dev_reservation_lock); 3464 3465 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3466 " created new reservation holder TYPE: %s on object RTPI:" 3467 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3468 core_scsi3_pr_dump_type(type), rtpi, 3469 dest_pr_reg->pr_res_generation); 3470 pr_debug("SPC-3 PR Successfully moved reservation from" 3471 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3472 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3473 i_buf, dest_tf_ops->get_fabric_name(), 3474 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3475 iport_ptr : ""); 3476 /* 3477 * It is now safe to release configfs group dependencies for destination 3478 * of Transport ID Initiator Device/Port Identifier 3479 */ 3480 core_scsi3_lunacl_undepend_item(dest_se_deve); 3481 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3482 core_scsi3_tpg_undepend_item(dest_se_tpg); 3483 /* 3484 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3485 * nexus on which PERSISTENT RESERVE OUT command was received. 3486 */ 3487 if (unreg) { 3488 spin_lock(&pr_tmpl->registration_lock); 3489 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3490 spin_unlock(&pr_tmpl->registration_lock); 3491 } else 3492 core_scsi3_put_pr_reg(pr_reg); 3493 3494 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3495 3496 transport_kunmap_data_sg(cmd); 3497 3498 core_scsi3_put_pr_reg(dest_pr_reg); 3499 return 0; 3500 out: 3501 if (buf) 3502 transport_kunmap_data_sg(cmd); 3503 if (dest_se_deve) 3504 core_scsi3_lunacl_undepend_item(dest_se_deve); 3505 if (dest_node_acl) 3506 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3507 core_scsi3_tpg_undepend_item(dest_se_tpg); 3508 3509 out_put_pr_reg: 3510 core_scsi3_put_pr_reg(pr_reg); 3511 return ret; 3512 } 3513 3514 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3515 { 3516 unsigned int __v1, __v2; 3517 3518 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3519 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3520 3521 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3522 } 3523 3524 /* 3525 * See spc4r17 section 6.14 Table 170 3526 */ 3527 sense_reason_t 3528 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3529 { 3530 struct se_device *dev = cmd->se_dev; 3531 unsigned char *cdb = &cmd->t_task_cdb[0]; 3532 unsigned char *buf; 3533 u64 res_key, sa_res_key; 3534 int sa, scope, type, aptpl; 3535 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3536 sense_reason_t ret; 3537 3538 /* 3539 * Following spc2r20 5.5.1 Reservations overview: 3540 * 3541 * If a logical unit has been reserved by any RESERVE command and is 3542 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3543 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3544 * initiator or service action and shall terminate with a RESERVATION 3545 * CONFLICT status. 3546 */ 3547 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3548 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3549 " SPC-2 reservation is held, returning" 3550 " RESERVATION_CONFLICT\n"); 3551 return TCM_RESERVATION_CONFLICT; 3552 } 3553 3554 /* 3555 * FIXME: A NULL struct se_session pointer means an this is not coming from 3556 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3557 */ 3558 if (!cmd->se_sess) 3559 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3560 3561 if (cmd->data_length < 24) { 3562 pr_warn("SPC-PR: Received PR OUT parameter list" 3563 " length too small: %u\n", cmd->data_length); 3564 return TCM_INVALID_PARAMETER_LIST; 3565 } 3566 3567 /* 3568 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3569 */ 3570 sa = (cdb[1] & 0x1f); 3571 scope = (cdb[2] & 0xf0); 3572 type = (cdb[2] & 0x0f); 3573 3574 buf = transport_kmap_data_sg(cmd); 3575 if (!buf) 3576 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3577 3578 /* 3579 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3580 */ 3581 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3582 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3583 /* 3584 * REGISTER_AND_MOVE uses a different SA parameter list containing 3585 * SCSI TransportIDs. 3586 */ 3587 if (sa != PRO_REGISTER_AND_MOVE) { 3588 spec_i_pt = (buf[20] & 0x08); 3589 all_tg_pt = (buf[20] & 0x04); 3590 aptpl = (buf[20] & 0x01); 3591 } else { 3592 aptpl = (buf[17] & 0x01); 3593 unreg = (buf[17] & 0x02); 3594 } 3595 /* 3596 * If the backend device has been configured to force APTPL metadata 3597 * write-out, go ahead and propigate aptpl=1 down now. 3598 */ 3599 if (dev->dev_attrib.force_pr_aptpl) 3600 aptpl = 1; 3601 3602 transport_kunmap_data_sg(cmd); 3603 buf = NULL; 3604 3605 /* 3606 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3607 */ 3608 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3609 return TCM_INVALID_PARAMETER_LIST; 3610 3611 /* 3612 * From spc4r17 section 6.14: 3613 * 3614 * If the SPEC_I_PT bit is set to zero, the service action is not 3615 * REGISTER AND MOVE, and the parameter list length is not 24, then 3616 * the command shall be terminated with CHECK CONDITION status, with 3617 * the sense key set to ILLEGAL REQUEST, and the additional sense 3618 * code set to PARAMETER LIST LENGTH ERROR. 3619 */ 3620 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3621 (cmd->data_length != 24)) { 3622 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3623 " list length: %u\n", cmd->data_length); 3624 return TCM_INVALID_PARAMETER_LIST; 3625 } 3626 3627 /* 3628 * (core_scsi3_emulate_pro_* function parameters 3629 * are defined by spc4r17 Table 174: 3630 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3631 */ 3632 switch (sa) { 3633 case PRO_REGISTER: 3634 ret = core_scsi3_emulate_pro_register(cmd, 3635 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3636 break; 3637 case PRO_RESERVE: 3638 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3639 break; 3640 case PRO_RELEASE: 3641 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3642 break; 3643 case PRO_CLEAR: 3644 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3645 break; 3646 case PRO_PREEMPT: 3647 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3648 res_key, sa_res_key, PREEMPT); 3649 break; 3650 case PRO_PREEMPT_AND_ABORT: 3651 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3652 res_key, sa_res_key, PREEMPT_AND_ABORT); 3653 break; 3654 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3655 ret = core_scsi3_emulate_pro_register(cmd, 3656 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3657 break; 3658 case PRO_REGISTER_AND_MOVE: 3659 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3660 sa_res_key, aptpl, unreg); 3661 break; 3662 default: 3663 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3664 " action: 0x%02x\n", cdb[1] & 0x1f); 3665 return TCM_INVALID_CDB_FIELD; 3666 } 3667 3668 if (!ret) 3669 target_complete_cmd(cmd, GOOD); 3670 return ret; 3671 } 3672 3673 /* 3674 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3675 * 3676 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3677 */ 3678 static sense_reason_t 3679 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3680 { 3681 struct se_device *dev = cmd->se_dev; 3682 struct t10_pr_registration *pr_reg; 3683 unsigned char *buf; 3684 u32 add_len = 0, off = 8; 3685 3686 if (cmd->data_length < 8) { 3687 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3688 " too small\n", cmd->data_length); 3689 return TCM_INVALID_CDB_FIELD; 3690 } 3691 3692 buf = transport_kmap_data_sg(cmd); 3693 if (!buf) 3694 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3695 3696 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3697 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3698 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3699 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3700 3701 spin_lock(&dev->t10_pr.registration_lock); 3702 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3703 pr_reg_list) { 3704 /* 3705 * Check for overflow of 8byte PRI READ_KEYS payload and 3706 * next reservation key list descriptor. 3707 */ 3708 if ((add_len + 8) > (cmd->data_length - 8)) 3709 break; 3710 3711 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3712 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3713 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3714 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3715 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3716 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3717 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3718 buf[off++] = (pr_reg->pr_res_key & 0xff); 3719 3720 add_len += 8; 3721 } 3722 spin_unlock(&dev->t10_pr.registration_lock); 3723 3724 buf[4] = ((add_len >> 24) & 0xff); 3725 buf[5] = ((add_len >> 16) & 0xff); 3726 buf[6] = ((add_len >> 8) & 0xff); 3727 buf[7] = (add_len & 0xff); 3728 3729 transport_kunmap_data_sg(cmd); 3730 3731 return 0; 3732 } 3733 3734 /* 3735 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3736 * 3737 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3738 */ 3739 static sense_reason_t 3740 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3741 { 3742 struct se_device *dev = cmd->se_dev; 3743 struct t10_pr_registration *pr_reg; 3744 unsigned char *buf; 3745 u64 pr_res_key; 3746 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3747 3748 if (cmd->data_length < 8) { 3749 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3750 " too small\n", cmd->data_length); 3751 return TCM_INVALID_CDB_FIELD; 3752 } 3753 3754 buf = transport_kmap_data_sg(cmd); 3755 if (!buf) 3756 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3757 3758 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3759 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3760 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3761 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3762 3763 spin_lock(&dev->dev_reservation_lock); 3764 pr_reg = dev->dev_pr_res_holder; 3765 if (pr_reg) { 3766 /* 3767 * Set the hardcoded Additional Length 3768 */ 3769 buf[4] = ((add_len >> 24) & 0xff); 3770 buf[5] = ((add_len >> 16) & 0xff); 3771 buf[6] = ((add_len >> 8) & 0xff); 3772 buf[7] = (add_len & 0xff); 3773 3774 if (cmd->data_length < 22) 3775 goto err; 3776 3777 /* 3778 * Set the Reservation key. 3779 * 3780 * From spc4r17, section 5.7.10: 3781 * A persistent reservation holder has its reservation key 3782 * returned in the parameter data from a PERSISTENT 3783 * RESERVE IN command with READ RESERVATION service action as 3784 * follows: 3785 * a) For a persistent reservation of the type Write Exclusive 3786 * - All Registrants or Exclusive Access All Regitrants, 3787 * the reservation key shall be set to zero; or 3788 * b) For all other persistent reservation types, the 3789 * reservation key shall be set to the registered 3790 * reservation key for the I_T nexus that holds the 3791 * persistent reservation. 3792 */ 3793 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3794 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3795 pr_res_key = 0; 3796 else 3797 pr_res_key = pr_reg->pr_res_key; 3798 3799 buf[8] = ((pr_res_key >> 56) & 0xff); 3800 buf[9] = ((pr_res_key >> 48) & 0xff); 3801 buf[10] = ((pr_res_key >> 40) & 0xff); 3802 buf[11] = ((pr_res_key >> 32) & 0xff); 3803 buf[12] = ((pr_res_key >> 24) & 0xff); 3804 buf[13] = ((pr_res_key >> 16) & 0xff); 3805 buf[14] = ((pr_res_key >> 8) & 0xff); 3806 buf[15] = (pr_res_key & 0xff); 3807 /* 3808 * Set the SCOPE and TYPE 3809 */ 3810 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3811 (pr_reg->pr_res_type & 0x0f); 3812 } 3813 3814 err: 3815 spin_unlock(&dev->dev_reservation_lock); 3816 transport_kunmap_data_sg(cmd); 3817 3818 return 0; 3819 } 3820 3821 /* 3822 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3823 * 3824 * See spc4r17 section 6.13.4 Table 165 3825 */ 3826 static sense_reason_t 3827 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3828 { 3829 struct se_device *dev = cmd->se_dev; 3830 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3831 unsigned char *buf; 3832 u16 add_len = 8; /* Hardcoded to 8. */ 3833 3834 if (cmd->data_length < 6) { 3835 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3836 " %u too small\n", cmd->data_length); 3837 return TCM_INVALID_CDB_FIELD; 3838 } 3839 3840 buf = transport_kmap_data_sg(cmd); 3841 if (!buf) 3842 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3843 3844 buf[0] = ((add_len >> 8) & 0xff); 3845 buf[1] = (add_len & 0xff); 3846 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3847 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3848 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3849 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3850 /* 3851 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3852 * set the TMV: Task Mask Valid bit. 3853 */ 3854 buf[3] |= 0x80; 3855 /* 3856 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3857 */ 3858 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3859 /* 3860 * PTPL_A: Persistence across Target Power Loss Active bit 3861 */ 3862 if (pr_tmpl->pr_aptpl_active) 3863 buf[3] |= 0x01; 3864 /* 3865 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3866 */ 3867 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3868 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3869 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3870 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3871 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3872 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3873 3874 transport_kunmap_data_sg(cmd); 3875 3876 return 0; 3877 } 3878 3879 /* 3880 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3881 * 3882 * See spc4r17 section 6.13.5 Table 168 and 169 3883 */ 3884 static sense_reason_t 3885 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3886 { 3887 struct se_device *dev = cmd->se_dev; 3888 struct se_node_acl *se_nacl; 3889 struct se_portal_group *se_tpg; 3890 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3891 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3892 unsigned char *buf; 3893 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3894 u32 off = 8; /* off into first Full Status descriptor */ 3895 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3896 bool all_reg = false; 3897 3898 if (cmd->data_length < 8) { 3899 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3900 " too small\n", cmd->data_length); 3901 return TCM_INVALID_CDB_FIELD; 3902 } 3903 3904 buf = transport_kmap_data_sg(cmd); 3905 if (!buf) 3906 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3907 3908 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3909 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3910 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3911 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3912 3913 spin_lock(&dev->dev_reservation_lock); 3914 if (dev->dev_pr_res_holder) { 3915 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3916 3917 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3918 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3919 all_reg = true; 3920 pr_res_type = pr_holder->pr_res_type; 3921 pr_res_scope = pr_holder->pr_res_scope; 3922 } 3923 } 3924 spin_unlock(&dev->dev_reservation_lock); 3925 3926 spin_lock(&pr_tmpl->registration_lock); 3927 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3928 &pr_tmpl->registration_list, pr_reg_list) { 3929 3930 se_nacl = pr_reg->pr_reg_nacl; 3931 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3932 add_desc_len = 0; 3933 3934 atomic_inc_mb(&pr_reg->pr_res_holders); 3935 spin_unlock(&pr_tmpl->registration_lock); 3936 /* 3937 * Determine expected length of $FABRIC_MOD specific 3938 * TransportID full status descriptor.. 3939 */ 3940 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3941 se_tpg, se_nacl, pr_reg, &format_code); 3942 3943 if ((exp_desc_len + add_len) > cmd->data_length) { 3944 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3945 " out of buffer: %d\n", cmd->data_length); 3946 spin_lock(&pr_tmpl->registration_lock); 3947 atomic_dec_mb(&pr_reg->pr_res_holders); 3948 break; 3949 } 3950 /* 3951 * Set RESERVATION KEY 3952 */ 3953 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3954 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3955 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3956 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3957 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3958 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3959 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3960 buf[off++] = (pr_reg->pr_res_key & 0xff); 3961 off += 4; /* Skip Over Reserved area */ 3962 3963 /* 3964 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3965 */ 3966 if (pr_reg->pr_reg_all_tg_pt) 3967 buf[off] = 0x02; 3968 /* 3969 * The struct se_lun pointer will be present for the 3970 * reservation holder for PR_HOLDER bit. 3971 * 3972 * Also, if this registration is the reservation 3973 * holder or there is an All Registrants reservation 3974 * active, fill in SCOPE and TYPE in the next byte. 3975 */ 3976 if (pr_reg->pr_res_holder) { 3977 buf[off++] |= 0x01; 3978 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3979 (pr_reg->pr_res_type & 0x0f); 3980 } else if (all_reg) { 3981 buf[off++] |= 0x01; 3982 buf[off++] = (pr_res_scope & 0xf0) | 3983 (pr_res_type & 0x0f); 3984 } else { 3985 off += 2; 3986 } 3987 3988 off += 4; /* Skip over reserved area */ 3989 /* 3990 * From spc4r17 6.3.15: 3991 * 3992 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3993 * IDENTIFIER field contains the relative port identifier (see 3994 * 3.1.120) of the target port that is part of the I_T nexus 3995 * described by this full status descriptor. If the ALL_TG_PT 3996 * bit is set to one, the contents of the RELATIVE TARGET PORT 3997 * IDENTIFIER field are not defined by this standard. 3998 */ 3999 if (!pr_reg->pr_reg_all_tg_pt) { 4000 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4001 4002 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4003 buf[off++] = (port->sep_rtpi & 0xff); 4004 } else 4005 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4006 4007 /* 4008 * Now, have the $FABRIC_MOD fill in the protocol identifier 4009 */ 4010 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4011 se_nacl, pr_reg, &format_code, &buf[off+4]); 4012 4013 spin_lock(&pr_tmpl->registration_lock); 4014 atomic_dec_mb(&pr_reg->pr_res_holders); 4015 /* 4016 * Set the ADDITIONAL DESCRIPTOR LENGTH 4017 */ 4018 buf[off++] = ((desc_len >> 24) & 0xff); 4019 buf[off++] = ((desc_len >> 16) & 0xff); 4020 buf[off++] = ((desc_len >> 8) & 0xff); 4021 buf[off++] = (desc_len & 0xff); 4022 /* 4023 * Size of full desctipor header minus TransportID 4024 * containing $FABRIC_MOD specific) initiator device/port 4025 * WWN information. 4026 * 4027 * See spc4r17 Section 6.13.5 Table 169 4028 */ 4029 add_desc_len = (24 + desc_len); 4030 4031 off += desc_len; 4032 add_len += add_desc_len; 4033 } 4034 spin_unlock(&pr_tmpl->registration_lock); 4035 /* 4036 * Set ADDITIONAL_LENGTH 4037 */ 4038 buf[4] = ((add_len >> 24) & 0xff); 4039 buf[5] = ((add_len >> 16) & 0xff); 4040 buf[6] = ((add_len >> 8) & 0xff); 4041 buf[7] = (add_len & 0xff); 4042 4043 transport_kunmap_data_sg(cmd); 4044 4045 return 0; 4046 } 4047 4048 sense_reason_t 4049 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4050 { 4051 sense_reason_t ret; 4052 4053 /* 4054 * Following spc2r20 5.5.1 Reservations overview: 4055 * 4056 * If a logical unit has been reserved by any RESERVE command and is 4057 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4058 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4059 * initiator or service action and shall terminate with a RESERVATION 4060 * CONFLICT status. 4061 */ 4062 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4063 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4064 " SPC-2 reservation is held, returning" 4065 " RESERVATION_CONFLICT\n"); 4066 return TCM_RESERVATION_CONFLICT; 4067 } 4068 4069 switch (cmd->t_task_cdb[1] & 0x1f) { 4070 case PRI_READ_KEYS: 4071 ret = core_scsi3_pri_read_keys(cmd); 4072 break; 4073 case PRI_READ_RESERVATION: 4074 ret = core_scsi3_pri_read_reservation(cmd); 4075 break; 4076 case PRI_REPORT_CAPABILITIES: 4077 ret = core_scsi3_pri_report_capabilities(cmd); 4078 break; 4079 case PRI_READ_FULL_STATUS: 4080 ret = core_scsi3_pri_read_full_status(cmd); 4081 break; 4082 default: 4083 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4084 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4085 return TCM_INVALID_CDB_FIELD; 4086 } 4087 4088 if (!ret) 4089 target_complete_cmd(cmd, GOOD); 4090 return ret; 4091 } 4092 4093 sense_reason_t 4094 target_check_reservation(struct se_cmd *cmd) 4095 { 4096 struct se_device *dev = cmd->se_dev; 4097 sense_reason_t ret; 4098 4099 if (!cmd->se_sess) 4100 return 0; 4101 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4102 return 0; 4103 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 4104 return 0; 4105 4106 spin_lock(&dev->dev_reservation_lock); 4107 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4108 ret = target_scsi2_reservation_check(cmd); 4109 else 4110 ret = target_scsi3_pr_reservation_check(cmd); 4111 spin_unlock(&dev->dev_reservation_lock); 4112 4113 return ret; 4114 } 4115