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 APTPL metadata," 1878 " reallocating larger buffer\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 APTPL metadata," 1896 " reallocating larger buffer\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, len = PR_APTPL_BUF_LEN; 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 retry: 1974 buf = vzalloc(len); 1975 if (!buf) 1976 return TCM_OUT_OF_RESOURCES; 1977 1978 rc = core_scsi3_update_aptpl_buf(dev, buf, len); 1979 if (rc < 0) { 1980 vfree(buf); 1981 len *= 2; 1982 goto retry; 1983 } 1984 1985 rc = __core_scsi3_write_aptpl_to_file(dev, buf); 1986 if (rc != 0) { 1987 pr_err("SPC-3 PR: Could not update APTPL\n"); 1988 vfree(buf); 1989 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1990 } 1991 dev->t10_pr.pr_aptpl_active = 1; 1992 vfree(buf); 1993 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); 1994 return 0; 1995 } 1996 1997 static sense_reason_t 1998 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, 1999 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type) 2000 { 2001 struct se_session *se_sess = cmd->se_sess; 2002 struct se_device *dev = cmd->se_dev; 2003 struct se_dev_entry *se_deve; 2004 struct se_lun *se_lun = cmd->se_lun; 2005 struct se_portal_group *se_tpg; 2006 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp; 2007 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2008 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2009 sense_reason_t ret = TCM_NO_SENSE; 2010 int pr_holder = 0, type; 2011 2012 if (!se_sess || !se_lun) { 2013 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2014 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2015 } 2016 se_tpg = se_sess->se_tpg; 2017 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2018 2019 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2020 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2021 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2022 PR_REG_ISID_LEN); 2023 isid_ptr = &isid_buf[0]; 2024 } 2025 /* 2026 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2027 */ 2028 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2029 if (!pr_reg) { 2030 if (res_key) { 2031 pr_warn("SPC-3 PR: Reservation Key non-zero" 2032 " for SA REGISTER, returning CONFLICT\n"); 2033 return TCM_RESERVATION_CONFLICT; 2034 } 2035 /* 2036 * Do nothing but return GOOD status. 2037 */ 2038 if (!sa_res_key) 2039 return 0; 2040 2041 if (!spec_i_pt) { 2042 /* 2043 * Perform the Service Action REGISTER on the Initiator 2044 * Port Endpoint that the PRO was received from on the 2045 * Logical Unit of the SCSI device server. 2046 */ 2047 if (core_scsi3_alloc_registration(cmd->se_dev, 2048 se_sess->se_node_acl, se_deve, isid_ptr, 2049 sa_res_key, all_tg_pt, aptpl, 2050 register_type, 0)) { 2051 pr_err("Unable to allocate" 2052 " struct t10_pr_registration\n"); 2053 return TCM_INVALID_PARAMETER_LIST; 2054 } 2055 } else { 2056 /* 2057 * Register both the Initiator port that received 2058 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2059 * TransportID from Parameter list and loop through 2060 * fabric dependent parameter list while calling 2061 * logic from of core_scsi3_alloc_registration() for 2062 * each TransportID provided SCSI Initiator Port/Device 2063 */ 2064 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2065 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2066 if (ret != 0) 2067 return ret; 2068 } 2069 2070 return core_scsi3_update_and_write_aptpl(dev, aptpl); 2071 } 2072 2073 /* ok, existing registration */ 2074 2075 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) { 2076 pr_err("SPC-3 PR REGISTER: Received" 2077 " res_key: 0x%016Lx does not match" 2078 " existing SA REGISTER res_key:" 2079 " 0x%016Lx\n", res_key, 2080 pr_reg->pr_res_key); 2081 ret = TCM_RESERVATION_CONFLICT; 2082 goto out; 2083 } 2084 2085 if (spec_i_pt) { 2086 pr_err("SPC-3 PR REGISTER: SPEC_I_PT" 2087 " set on a registered nexus\n"); 2088 ret = TCM_INVALID_PARAMETER_LIST; 2089 goto out; 2090 } 2091 2092 /* 2093 * An existing ALL_TG_PT=1 registration being released 2094 * must also set ALL_TG_PT=1 in the incoming PROUT. 2095 */ 2096 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) { 2097 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1" 2098 " registration exists, but ALL_TG_PT=1 bit not" 2099 " present in received PROUT\n"); 2100 ret = TCM_INVALID_CDB_FIELD; 2101 goto out; 2102 } 2103 2104 /* 2105 * sa_res_key=1 Change Reservation Key for registered I_T Nexus. 2106 */ 2107 if (sa_res_key) { 2108 /* 2109 * Increment PRgeneration counter for struct se_device" 2110 * upon a successful REGISTER, see spc4r17 section 6.3.2 2111 * READ_KEYS service action. 2112 */ 2113 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev); 2114 pr_reg->pr_res_key = sa_res_key; 2115 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2116 " Key for %s to: 0x%016Lx PRgeneration:" 2117 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2118 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "", 2119 pr_reg->pr_reg_nacl->initiatorname, 2120 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2121 2122 } else { 2123 /* 2124 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus. 2125 */ 2126 type = pr_reg->pr_res_type; 2127 pr_holder = core_scsi3_check_implicit_release(cmd->se_dev, 2128 pr_reg); 2129 if (pr_holder < 0) { 2130 ret = TCM_RESERVATION_CONFLICT; 2131 goto out; 2132 } 2133 2134 spin_lock(&pr_tmpl->registration_lock); 2135 /* 2136 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2137 * and matching pr_res_key. 2138 */ 2139 if (pr_reg->pr_reg_all_tg_pt) { 2140 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2141 &pr_tmpl->registration_list, 2142 pr_reg_list) { 2143 2144 if (!pr_reg_p->pr_reg_all_tg_pt) 2145 continue; 2146 if (pr_reg_p->pr_res_key != res_key) 2147 continue; 2148 if (pr_reg == pr_reg_p) 2149 continue; 2150 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2151 pr_reg_p->pr_reg_nacl->initiatorname)) 2152 continue; 2153 2154 __core_scsi3_free_registration(dev, 2155 pr_reg_p, NULL, 0); 2156 } 2157 } 2158 2159 /* 2160 * Release the calling I_T Nexus registration now.. 2161 */ 2162 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1); 2163 pr_reg = NULL; 2164 2165 /* 2166 * From spc4r17, section 5.7.11.3 Unregistering 2167 * 2168 * If the persistent reservation is a registrants only 2169 * type, the device server shall establish a unit 2170 * attention condition for the initiator port associated 2171 * with every registered I_T nexus except for the I_T 2172 * nexus on which the PERSISTENT RESERVE OUT command was 2173 * received, with the additional sense code set to 2174 * RESERVATIONS RELEASED. 2175 */ 2176 if (pr_holder && 2177 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY || 2178 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) { 2179 list_for_each_entry(pr_reg_p, 2180 &pr_tmpl->registration_list, 2181 pr_reg_list) { 2182 2183 core_scsi3_ua_allocate( 2184 pr_reg_p->pr_reg_nacl, 2185 pr_reg_p->pr_res_mapped_lun, 2186 0x2A, 2187 ASCQ_2AH_RESERVATIONS_RELEASED); 2188 } 2189 } 2190 2191 spin_unlock(&pr_tmpl->registration_lock); 2192 } 2193 2194 ret = core_scsi3_update_and_write_aptpl(dev, aptpl); 2195 2196 out: 2197 if (pr_reg) 2198 core_scsi3_put_pr_reg(pr_reg); 2199 return ret; 2200 } 2201 2202 unsigned char *core_scsi3_pr_dump_type(int type) 2203 { 2204 switch (type) { 2205 case PR_TYPE_WRITE_EXCLUSIVE: 2206 return "Write Exclusive Access"; 2207 case PR_TYPE_EXCLUSIVE_ACCESS: 2208 return "Exclusive Access"; 2209 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2210 return "Write Exclusive Access, Registrants Only"; 2211 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2212 return "Exclusive Access, Registrants Only"; 2213 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2214 return "Write Exclusive Access, All Registrants"; 2215 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2216 return "Exclusive Access, All Registrants"; 2217 default: 2218 break; 2219 } 2220 2221 return "Unknown SPC-3 PR Type"; 2222 } 2223 2224 static sense_reason_t 2225 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) 2226 { 2227 struct se_device *dev = cmd->se_dev; 2228 struct se_session *se_sess = cmd->se_sess; 2229 struct se_lun *se_lun = cmd->se_lun; 2230 struct t10_pr_registration *pr_reg, *pr_res_holder; 2231 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2232 char i_buf[PR_REG_ISID_ID_LEN]; 2233 sense_reason_t ret; 2234 2235 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2236 2237 if (!se_sess || !se_lun) { 2238 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2239 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2240 } 2241 /* 2242 * Locate the existing *pr_reg via struct se_node_acl pointers 2243 */ 2244 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2245 se_sess); 2246 if (!pr_reg) { 2247 pr_err("SPC-3 PR: Unable to locate" 2248 " PR_REGISTERED *pr_reg for RESERVE\n"); 2249 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2250 } 2251 /* 2252 * From spc4r17 Section 5.7.9: Reserving: 2253 * 2254 * An application client creates a persistent reservation by issuing 2255 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2256 * a registered I_T nexus with the following parameters: 2257 * a) RESERVATION KEY set to the value of the reservation key that is 2258 * registered with the logical unit for the I_T nexus; and 2259 */ 2260 if (res_key != pr_reg->pr_res_key) { 2261 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2262 " does not match existing SA REGISTER res_key:" 2263 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2264 ret = TCM_RESERVATION_CONFLICT; 2265 goto out_put_pr_reg; 2266 } 2267 /* 2268 * From spc4r17 Section 5.7.9: Reserving: 2269 * 2270 * From above: 2271 * b) TYPE field and SCOPE field set to the persistent reservation 2272 * being created. 2273 * 2274 * Only one persistent reservation is allowed at a time per logical unit 2275 * and that persistent reservation has a scope of LU_SCOPE. 2276 */ 2277 if (scope != PR_SCOPE_LU_SCOPE) { 2278 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2279 ret = TCM_INVALID_PARAMETER_LIST; 2280 goto out_put_pr_reg; 2281 } 2282 /* 2283 * See if we have an existing PR reservation holder pointer at 2284 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2285 * *pr_res_holder. 2286 */ 2287 spin_lock(&dev->dev_reservation_lock); 2288 pr_res_holder = dev->dev_pr_res_holder; 2289 if (pr_res_holder) { 2290 int pr_res_type = pr_res_holder->pr_res_type; 2291 /* 2292 * From spc4r17 Section 5.7.9: Reserving: 2293 * 2294 * If the device server receives a PERSISTENT RESERVE OUT 2295 * command from an I_T nexus other than a persistent reservation 2296 * holder (see 5.7.10) that attempts to create a persistent 2297 * reservation when a persistent reservation already exists for 2298 * the logical unit, then the command shall be completed with 2299 * RESERVATION CONFLICT status. 2300 */ 2301 if ((pr_res_holder != pr_reg) && 2302 (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2303 (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2304 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2305 pr_err("SPC-3 PR: Attempted RESERVE from" 2306 " [%s]: %s while reservation already held by" 2307 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2308 cmd->se_tfo->get_fabric_name(), 2309 se_sess->se_node_acl->initiatorname, 2310 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2311 pr_res_holder->pr_reg_nacl->initiatorname); 2312 2313 spin_unlock(&dev->dev_reservation_lock); 2314 ret = TCM_RESERVATION_CONFLICT; 2315 goto out_put_pr_reg; 2316 } 2317 /* 2318 * From spc4r17 Section 5.7.9: Reserving: 2319 * 2320 * If a persistent reservation holder attempts to modify the 2321 * type or scope of an existing persistent reservation, the 2322 * command shall be completed with RESERVATION CONFLICT status. 2323 */ 2324 if ((pr_res_holder->pr_res_type != type) || 2325 (pr_res_holder->pr_res_scope != scope)) { 2326 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2327 pr_err("SPC-3 PR: Attempted RESERVE from" 2328 " [%s]: %s trying to change TYPE and/or SCOPE," 2329 " while reservation already held by [%s]: %s," 2330 " returning RESERVATION_CONFLICT\n", 2331 cmd->se_tfo->get_fabric_name(), 2332 se_sess->se_node_acl->initiatorname, 2333 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2334 pr_res_holder->pr_reg_nacl->initiatorname); 2335 2336 spin_unlock(&dev->dev_reservation_lock); 2337 ret = TCM_RESERVATION_CONFLICT; 2338 goto out_put_pr_reg; 2339 } 2340 /* 2341 * From spc4r17 Section 5.7.9: Reserving: 2342 * 2343 * If the device server receives a PERSISTENT RESERVE OUT 2344 * command with RESERVE service action where the TYPE field and 2345 * the SCOPE field contain the same values as the existing type 2346 * and scope from a persistent reservation holder, it shall not 2347 * make any change to the existing persistent reservation and 2348 * shall completethe command with GOOD status. 2349 */ 2350 spin_unlock(&dev->dev_reservation_lock); 2351 ret = 0; 2352 goto out_put_pr_reg; 2353 } 2354 /* 2355 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2356 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2357 */ 2358 pr_reg->pr_res_scope = scope; 2359 pr_reg->pr_res_type = type; 2360 pr_reg->pr_res_holder = 1; 2361 dev->dev_pr_res_holder = pr_reg; 2362 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2363 2364 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2365 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2366 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2367 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2368 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2369 cmd->se_tfo->get_fabric_name(), 2370 se_sess->se_node_acl->initiatorname, 2371 i_buf); 2372 spin_unlock(&dev->dev_reservation_lock); 2373 2374 if (pr_tmpl->pr_aptpl_active) 2375 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2376 2377 ret = 0; 2378 out_put_pr_reg: 2379 core_scsi3_put_pr_reg(pr_reg); 2380 return ret; 2381 } 2382 2383 static sense_reason_t 2384 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope, 2385 u64 res_key) 2386 { 2387 switch (type) { 2388 case PR_TYPE_WRITE_EXCLUSIVE: 2389 case PR_TYPE_EXCLUSIVE_ACCESS: 2390 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2391 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2392 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2393 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2394 return core_scsi3_pro_reserve(cmd, type, scope, res_key); 2395 default: 2396 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2397 " 0x%02x\n", type); 2398 return TCM_INVALID_CDB_FIELD; 2399 } 2400 } 2401 2402 /* 2403 * Called with struct se_device->dev_reservation_lock held. 2404 */ 2405 static void __core_scsi3_complete_pro_release( 2406 struct se_device *dev, 2407 struct se_node_acl *se_nacl, 2408 struct t10_pr_registration *pr_reg, 2409 int explicit, 2410 int unreg) 2411 { 2412 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2413 char i_buf[PR_REG_ISID_ID_LEN]; 2414 int pr_res_type = 0, pr_res_scope = 0; 2415 2416 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2417 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2418 /* 2419 * Go ahead and release the current PR reservation holder. 2420 * If an All Registrants reservation is currently active and 2421 * a unregister operation is requested, replace the current 2422 * dev_pr_res_holder with another active registration. 2423 */ 2424 if (dev->dev_pr_res_holder) { 2425 pr_res_type = dev->dev_pr_res_holder->pr_res_type; 2426 pr_res_scope = dev->dev_pr_res_holder->pr_res_scope; 2427 dev->dev_pr_res_holder->pr_res_type = 0; 2428 dev->dev_pr_res_holder->pr_res_scope = 0; 2429 dev->dev_pr_res_holder->pr_res_holder = 0; 2430 dev->dev_pr_res_holder = NULL; 2431 } 2432 if (!unreg) 2433 goto out; 2434 2435 spin_lock(&dev->t10_pr.registration_lock); 2436 list_del_init(&pr_reg->pr_reg_list); 2437 /* 2438 * If the I_T nexus is a reservation holder, the persistent reservation 2439 * is of an all registrants type, and the I_T nexus is the last remaining 2440 * registered I_T nexus, then the device server shall also release the 2441 * persistent reservation. 2442 */ 2443 if (!list_empty(&dev->t10_pr.registration_list) && 2444 ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2445 (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) { 2446 dev->dev_pr_res_holder = 2447 list_entry(dev->t10_pr.registration_list.next, 2448 struct t10_pr_registration, pr_reg_list); 2449 dev->dev_pr_res_holder->pr_res_type = pr_res_type; 2450 dev->dev_pr_res_holder->pr_res_scope = pr_res_scope; 2451 dev->dev_pr_res_holder->pr_res_holder = 1; 2452 } 2453 spin_unlock(&dev->t10_pr.registration_lock); 2454 out: 2455 if (!dev->dev_pr_res_holder) { 2456 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2457 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2458 tfo->get_fabric_name(), (explicit) ? "explicit" : 2459 "implicit", core_scsi3_pr_dump_type(pr_res_type), 2460 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2461 } 2462 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2463 tfo->get_fabric_name(), se_nacl->initiatorname, 2464 i_buf); 2465 /* 2466 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2467 */ 2468 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2469 } 2470 2471 static sense_reason_t 2472 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, 2473 u64 res_key) 2474 { 2475 struct se_device *dev = cmd->se_dev; 2476 struct se_session *se_sess = cmd->se_sess; 2477 struct se_lun *se_lun = cmd->se_lun; 2478 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2479 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2480 int all_reg = 0; 2481 sense_reason_t ret = 0; 2482 2483 if (!se_sess || !se_lun) { 2484 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2485 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2486 } 2487 /* 2488 * Locate the existing *pr_reg via struct se_node_acl pointers 2489 */ 2490 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2491 if (!pr_reg) { 2492 pr_err("SPC-3 PR: Unable to locate" 2493 " PR_REGISTERED *pr_reg for RELEASE\n"); 2494 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2495 } 2496 /* 2497 * From spc4r17 Section 5.7.11.2 Releasing: 2498 * 2499 * If there is no persistent reservation or in response to a persistent 2500 * reservation release request from a registered I_T nexus that is not a 2501 * persistent reservation holder (see 5.7.10), the device server shall 2502 * do the following: 2503 * 2504 * a) Not release the persistent reservation, if any; 2505 * b) Not remove any registrations; and 2506 * c) Complete the command with GOOD status. 2507 */ 2508 spin_lock(&dev->dev_reservation_lock); 2509 pr_res_holder = dev->dev_pr_res_holder; 2510 if (!pr_res_holder) { 2511 /* 2512 * No persistent reservation, return GOOD status. 2513 */ 2514 spin_unlock(&dev->dev_reservation_lock); 2515 goto out_put_pr_reg; 2516 } 2517 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2518 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2519 all_reg = 1; 2520 2521 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2522 /* 2523 * Non 'All Registrants' PR Type cases.. 2524 * Release request from a registered I_T nexus that is not a 2525 * persistent reservation holder. return GOOD status. 2526 */ 2527 spin_unlock(&dev->dev_reservation_lock); 2528 goto out_put_pr_reg; 2529 } 2530 2531 /* 2532 * From spc4r17 Section 5.7.11.2 Releasing: 2533 * 2534 * Only the persistent reservation holder (see 5.7.10) is allowed to 2535 * release a persistent reservation. 2536 * 2537 * An application client releases the persistent reservation by issuing 2538 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2539 * an I_T nexus that is a persistent reservation holder with the 2540 * following parameters: 2541 * 2542 * a) RESERVATION KEY field set to the value of the reservation key 2543 * that is registered with the logical unit for the I_T nexus; 2544 */ 2545 if (res_key != pr_reg->pr_res_key) { 2546 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2547 " does not match existing SA REGISTER res_key:" 2548 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2549 spin_unlock(&dev->dev_reservation_lock); 2550 ret = TCM_RESERVATION_CONFLICT; 2551 goto out_put_pr_reg; 2552 } 2553 /* 2554 * From spc4r17 Section 5.7.11.2 Releasing and above: 2555 * 2556 * b) TYPE field and SCOPE field set to match the persistent 2557 * reservation being released. 2558 */ 2559 if ((pr_res_holder->pr_res_type != type) || 2560 (pr_res_holder->pr_res_scope != scope)) { 2561 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2562 pr_err("SPC-3 PR RELEASE: Attempted to release" 2563 " reservation from [%s]: %s with different TYPE " 2564 "and/or SCOPE while reservation already held by" 2565 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2566 cmd->se_tfo->get_fabric_name(), 2567 se_sess->se_node_acl->initiatorname, 2568 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2569 pr_res_holder->pr_reg_nacl->initiatorname); 2570 2571 spin_unlock(&dev->dev_reservation_lock); 2572 ret = TCM_RESERVATION_CONFLICT; 2573 goto out_put_pr_reg; 2574 } 2575 /* 2576 * In response to a persistent reservation release request from the 2577 * persistent reservation holder the device server shall perform a 2578 * release by doing the following as an uninterrupted series of actions: 2579 * a) Release the persistent reservation; 2580 * b) Not remove any registration(s); 2581 * c) If the released persistent reservation is a registrants only type 2582 * or all registrants type persistent reservation, 2583 * the device server shall establish a unit attention condition for 2584 * the initiator port associated with every regis- 2585 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2586 * RESERVE OUT command with RELEASE service action was received, 2587 * with the additional sense code set to RESERVATIONS RELEASED; and 2588 * d) If the persistent reservation is of any other type, the device 2589 * server shall not establish a unit attention condition. 2590 */ 2591 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2592 pr_reg, 1, 0); 2593 2594 spin_unlock(&dev->dev_reservation_lock); 2595 2596 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2597 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2598 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2599 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2600 /* 2601 * If no UNIT ATTENTION conditions will be established for 2602 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2603 * go ahead and check for APTPL=1 update+write below 2604 */ 2605 goto write_aptpl; 2606 } 2607 2608 spin_lock(&pr_tmpl->registration_lock); 2609 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2610 pr_reg_list) { 2611 /* 2612 * Do not establish a UNIT ATTENTION condition 2613 * for the calling I_T Nexus 2614 */ 2615 if (pr_reg_p == pr_reg) 2616 continue; 2617 2618 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2619 pr_reg_p->pr_res_mapped_lun, 2620 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2621 } 2622 spin_unlock(&pr_tmpl->registration_lock); 2623 2624 write_aptpl: 2625 if (pr_tmpl->pr_aptpl_active) 2626 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2627 2628 out_put_pr_reg: 2629 core_scsi3_put_pr_reg(pr_reg); 2630 return ret; 2631 } 2632 2633 static sense_reason_t 2634 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) 2635 { 2636 struct se_device *dev = cmd->se_dev; 2637 struct se_node_acl *pr_reg_nacl; 2638 struct se_session *se_sess = cmd->se_sess; 2639 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2640 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2641 u32 pr_res_mapped_lun = 0; 2642 int calling_it_nexus = 0; 2643 /* 2644 * Locate the existing *pr_reg via struct se_node_acl pointers 2645 */ 2646 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2647 se_sess->se_node_acl, se_sess); 2648 if (!pr_reg_n) { 2649 pr_err("SPC-3 PR: Unable to locate" 2650 " PR_REGISTERED *pr_reg for CLEAR\n"); 2651 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2652 } 2653 /* 2654 * From spc4r17 section 5.7.11.6, Clearing: 2655 * 2656 * Any application client may release the persistent reservation and 2657 * remove all registrations from a device server by issuing a 2658 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2659 * registered I_T nexus with the following parameter: 2660 * 2661 * a) RESERVATION KEY field set to the value of the reservation key 2662 * that is registered with the logical unit for the I_T nexus. 2663 */ 2664 if (res_key != pr_reg_n->pr_res_key) { 2665 pr_err("SPC-3 PR REGISTER: Received" 2666 " res_key: 0x%016Lx does not match" 2667 " existing SA REGISTER res_key:" 2668 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2669 core_scsi3_put_pr_reg(pr_reg_n); 2670 return TCM_RESERVATION_CONFLICT; 2671 } 2672 /* 2673 * a) Release the persistent reservation, if any; 2674 */ 2675 spin_lock(&dev->dev_reservation_lock); 2676 pr_res_holder = dev->dev_pr_res_holder; 2677 if (pr_res_holder) { 2678 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2679 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2680 pr_res_holder, 0, 0); 2681 } 2682 spin_unlock(&dev->dev_reservation_lock); 2683 /* 2684 * b) Remove all registration(s) (see spc4r17 5.7.7); 2685 */ 2686 spin_lock(&pr_tmpl->registration_lock); 2687 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2688 &pr_tmpl->registration_list, pr_reg_list) { 2689 2690 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2691 pr_reg_nacl = pr_reg->pr_reg_nacl; 2692 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2693 __core_scsi3_free_registration(dev, pr_reg, NULL, 2694 calling_it_nexus); 2695 /* 2696 * e) Establish a unit attention condition for the initiator 2697 * port associated with every registered I_T nexus other 2698 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2699 * command with CLEAR service action was received, with the 2700 * additional sense code set to RESERVATIONS PREEMPTED. 2701 */ 2702 if (!calling_it_nexus) 2703 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2704 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2705 } 2706 spin_unlock(&pr_tmpl->registration_lock); 2707 2708 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2709 cmd->se_tfo->get_fabric_name()); 2710 2711 core_scsi3_update_and_write_aptpl(cmd->se_dev, false); 2712 2713 core_scsi3_pr_generation(dev); 2714 return 0; 2715 } 2716 2717 /* 2718 * Called with struct se_device->dev_reservation_lock held. 2719 */ 2720 static void __core_scsi3_complete_pro_preempt( 2721 struct se_device *dev, 2722 struct t10_pr_registration *pr_reg, 2723 struct list_head *preempt_and_abort_list, 2724 int type, 2725 int scope, 2726 enum preempt_type preempt_type) 2727 { 2728 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2729 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2730 char i_buf[PR_REG_ISID_ID_LEN]; 2731 2732 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2733 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 2734 /* 2735 * Do an implicit RELEASE of the existing reservation. 2736 */ 2737 if (dev->dev_pr_res_holder) 2738 __core_scsi3_complete_pro_release(dev, nacl, 2739 dev->dev_pr_res_holder, 0, 0); 2740 2741 dev->dev_pr_res_holder = pr_reg; 2742 pr_reg->pr_res_holder = 1; 2743 pr_reg->pr_res_type = type; 2744 pr_reg->pr_res_scope = scope; 2745 2746 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2747 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2748 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2749 core_scsi3_pr_dump_type(type), 2750 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2751 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2752 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", 2753 nacl->initiatorname, i_buf); 2754 /* 2755 * For PREEMPT_AND_ABORT, add the preempting reservation's 2756 * struct t10_pr_registration to the list that will be compared 2757 * against received CDBs.. 2758 */ 2759 if (preempt_and_abort_list) 2760 list_add_tail(&pr_reg->pr_reg_abort_list, 2761 preempt_and_abort_list); 2762 } 2763 2764 static void core_scsi3_release_preempt_and_abort( 2765 struct list_head *preempt_and_abort_list, 2766 struct t10_pr_registration *pr_reg_holder) 2767 { 2768 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2769 2770 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2771 pr_reg_abort_list) { 2772 2773 list_del(&pr_reg->pr_reg_abort_list); 2774 if (pr_reg_holder == pr_reg) 2775 continue; 2776 if (pr_reg->pr_res_holder) { 2777 pr_warn("pr_reg->pr_res_holder still set\n"); 2778 continue; 2779 } 2780 2781 pr_reg->pr_reg_deve = NULL; 2782 pr_reg->pr_reg_nacl = NULL; 2783 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2784 } 2785 } 2786 2787 static sense_reason_t 2788 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, 2789 u64 sa_res_key, enum preempt_type preempt_type) 2790 { 2791 struct se_device *dev = cmd->se_dev; 2792 struct se_node_acl *pr_reg_nacl; 2793 struct se_session *se_sess = cmd->se_sess; 2794 LIST_HEAD(preempt_and_abort_list); 2795 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2796 struct t10_reservation *pr_tmpl = &dev->t10_pr; 2797 u32 pr_res_mapped_lun = 0; 2798 int all_reg = 0, calling_it_nexus = 0; 2799 bool sa_res_key_unmatched = sa_res_key != 0; 2800 int prh_type = 0, prh_scope = 0; 2801 2802 if (!se_sess) 2803 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2804 2805 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2806 se_sess); 2807 if (!pr_reg_n) { 2808 pr_err("SPC-3 PR: Unable to locate" 2809 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 2810 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); 2811 return TCM_RESERVATION_CONFLICT; 2812 } 2813 if (pr_reg_n->pr_res_key != res_key) { 2814 core_scsi3_put_pr_reg(pr_reg_n); 2815 return TCM_RESERVATION_CONFLICT; 2816 } 2817 if (scope != PR_SCOPE_LU_SCOPE) { 2818 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2819 core_scsi3_put_pr_reg(pr_reg_n); 2820 return TCM_INVALID_PARAMETER_LIST; 2821 } 2822 2823 spin_lock(&dev->dev_reservation_lock); 2824 pr_res_holder = dev->dev_pr_res_holder; 2825 if (pr_res_holder && 2826 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2827 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 2828 all_reg = 1; 2829 2830 if (!all_reg && !sa_res_key) { 2831 spin_unlock(&dev->dev_reservation_lock); 2832 core_scsi3_put_pr_reg(pr_reg_n); 2833 return TCM_INVALID_PARAMETER_LIST; 2834 } 2835 /* 2836 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 2837 * 2838 * If the SERVICE ACTION RESERVATION KEY field does not identify a 2839 * persistent reservation holder or there is no persistent reservation 2840 * holder (i.e., there is no persistent reservation), then the device 2841 * server shall perform a preempt by doing the following in an 2842 * uninterrupted series of actions. (See below..) 2843 */ 2844 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 2845 /* 2846 * No existing or SA Reservation Key matching reservations.. 2847 * 2848 * PROUT SA PREEMPT with All Registrant type reservations are 2849 * allowed to be processed without a matching SA Reservation Key 2850 */ 2851 spin_lock(&pr_tmpl->registration_lock); 2852 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2853 &pr_tmpl->registration_list, pr_reg_list) { 2854 /* 2855 * Removing of registrations in non all registrants 2856 * type reservations without a matching SA reservation 2857 * key. 2858 * 2859 * a) Remove the registrations for all I_T nexuses 2860 * specified by the SERVICE ACTION RESERVATION KEY 2861 * field; 2862 * b) Ignore the contents of the SCOPE and TYPE fields; 2863 * c) Process tasks as defined in 5.7.1; and 2864 * d) Establish a unit attention condition for the 2865 * initiator port associated with every I_T nexus 2866 * that lost its registration other than the I_T 2867 * nexus on which the PERSISTENT RESERVE OUT command 2868 * was received, with the additional sense code set 2869 * to REGISTRATIONS PREEMPTED. 2870 */ 2871 if (!all_reg) { 2872 if (pr_reg->pr_res_key != sa_res_key) 2873 continue; 2874 sa_res_key_unmatched = false; 2875 2876 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2877 pr_reg_nacl = pr_reg->pr_reg_nacl; 2878 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2879 __core_scsi3_free_registration(dev, pr_reg, 2880 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2881 NULL, calling_it_nexus); 2882 } else { 2883 /* 2884 * Case for any existing all registrants type 2885 * reservation, follow logic in spc4r17 section 2886 * 5.7.11.4 Preempting, Table 52 and Figure 7. 2887 * 2888 * For a ZERO SA Reservation key, release 2889 * all other registrations and do an implicit 2890 * release of active persistent reservation. 2891 * 2892 * For a non-ZERO SA Reservation key, only 2893 * release the matching reservation key from 2894 * registrations. 2895 */ 2896 if ((sa_res_key) && 2897 (pr_reg->pr_res_key != sa_res_key)) 2898 continue; 2899 sa_res_key_unmatched = false; 2900 2901 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2902 if (calling_it_nexus) 2903 continue; 2904 2905 pr_reg_nacl = pr_reg->pr_reg_nacl; 2906 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2907 __core_scsi3_free_registration(dev, pr_reg, 2908 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : 2909 NULL, 0); 2910 } 2911 if (!calling_it_nexus) 2912 core_scsi3_ua_allocate(pr_reg_nacl, 2913 pr_res_mapped_lun, 0x2A, 2914 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 2915 } 2916 spin_unlock(&pr_tmpl->registration_lock); 2917 /* 2918 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 2919 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 2920 * RESERVATION KEY field to a value that does not match any 2921 * registered reservation key, then the device server shall 2922 * complete the command with RESERVATION CONFLICT status. 2923 */ 2924 if (sa_res_key_unmatched) { 2925 spin_unlock(&dev->dev_reservation_lock); 2926 core_scsi3_put_pr_reg(pr_reg_n); 2927 return TCM_RESERVATION_CONFLICT; 2928 } 2929 /* 2930 * For an existing all registrants type reservation 2931 * with a zero SA rservation key, preempt the existing 2932 * reservation with the new PR type and scope. 2933 */ 2934 if (pr_res_holder && all_reg && !(sa_res_key)) { 2935 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 2936 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 2937 type, scope, preempt_type); 2938 2939 if (preempt_type == PREEMPT_AND_ABORT) 2940 core_scsi3_release_preempt_and_abort( 2941 &preempt_and_abort_list, pr_reg_n); 2942 } 2943 spin_unlock(&dev->dev_reservation_lock); 2944 2945 if (pr_tmpl->pr_aptpl_active) 2946 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 2947 2948 core_scsi3_put_pr_reg(pr_reg_n); 2949 core_scsi3_pr_generation(cmd->se_dev); 2950 return 0; 2951 } 2952 /* 2953 * The PREEMPTing SA reservation key matches that of the 2954 * existing persistent reservation, first, we check if 2955 * we are preempting our own reservation. 2956 * From spc4r17, section 5.7.11.4.3 Preempting 2957 * persistent reservations and registration handling 2958 * 2959 * If an all registrants persistent reservation is not 2960 * present, it is not an error for the persistent 2961 * reservation holder to preempt itself (i.e., a 2962 * PERSISTENT RESERVE OUT with a PREEMPT service action 2963 * or a PREEMPT AND ABORT service action with the 2964 * SERVICE ACTION RESERVATION KEY value equal to the 2965 * persistent reservation holder's reservation key that 2966 * is received from the persistent reservation holder). 2967 * In that case, the device server shall establish the 2968 * new persistent reservation and maintain the 2969 * registration. 2970 */ 2971 prh_type = pr_res_holder->pr_res_type; 2972 prh_scope = pr_res_holder->pr_res_scope; 2973 /* 2974 * If the SERVICE ACTION RESERVATION KEY field identifies a 2975 * persistent reservation holder (see 5.7.10), the device 2976 * server shall perform a preempt by doing the following as 2977 * an uninterrupted series of actions: 2978 * 2979 * a) Release the persistent reservation for the holder 2980 * identified by the SERVICE ACTION RESERVATION KEY field; 2981 */ 2982 if (pr_reg_n != pr_res_holder) 2983 __core_scsi3_complete_pro_release(dev, 2984 pr_res_holder->pr_reg_nacl, 2985 dev->dev_pr_res_holder, 0, 0); 2986 /* 2987 * b) Remove the registrations for all I_T nexuses identified 2988 * by the SERVICE ACTION RESERVATION KEY field, except the 2989 * I_T nexus that is being used for the PERSISTENT RESERVE 2990 * OUT command. If an all registrants persistent reservation 2991 * is present and the SERVICE ACTION RESERVATION KEY field 2992 * is set to zero, then all registrations shall be removed 2993 * except for that of the I_T nexus that is being used for 2994 * the PERSISTENT RESERVE OUT command; 2995 */ 2996 spin_lock(&pr_tmpl->registration_lock); 2997 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2998 &pr_tmpl->registration_list, pr_reg_list) { 2999 3000 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3001 if (calling_it_nexus) 3002 continue; 3003 3004 if (pr_reg->pr_res_key != sa_res_key) 3005 continue; 3006 3007 pr_reg_nacl = pr_reg->pr_reg_nacl; 3008 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3009 __core_scsi3_free_registration(dev, pr_reg, 3010 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3011 calling_it_nexus); 3012 /* 3013 * e) Establish a unit attention condition for the initiator 3014 * port associated with every I_T nexus that lost its 3015 * persistent reservation and/or registration, with the 3016 * additional sense code set to REGISTRATIONS PREEMPTED; 3017 */ 3018 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3019 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3020 } 3021 spin_unlock(&pr_tmpl->registration_lock); 3022 /* 3023 * c) Establish a persistent reservation for the preempting 3024 * I_T nexus using the contents of the SCOPE and TYPE fields; 3025 */ 3026 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3027 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL, 3028 type, scope, preempt_type); 3029 /* 3030 * d) Process tasks as defined in 5.7.1; 3031 * e) See above.. 3032 * f) If the type or scope has changed, then for every I_T nexus 3033 * whose reservation key was not removed, except for the I_T 3034 * nexus on which the PERSISTENT RESERVE OUT command was 3035 * received, the device server shall establish a unit 3036 * attention condition for the initiator port associated with 3037 * that I_T nexus, with the additional sense code set to 3038 * RESERVATIONS RELEASED. If the type or scope have not 3039 * changed, then no unit attention condition(s) shall be 3040 * established for this reason. 3041 */ 3042 if ((prh_type != type) || (prh_scope != scope)) { 3043 spin_lock(&pr_tmpl->registration_lock); 3044 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3045 &pr_tmpl->registration_list, pr_reg_list) { 3046 3047 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3048 if (calling_it_nexus) 3049 continue; 3050 3051 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3052 pr_reg->pr_res_mapped_lun, 0x2A, 3053 ASCQ_2AH_RESERVATIONS_RELEASED); 3054 } 3055 spin_unlock(&pr_tmpl->registration_lock); 3056 } 3057 spin_unlock(&dev->dev_reservation_lock); 3058 /* 3059 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3060 * All received CDBs for the matching existing reservation and 3061 * registrations undergo ABORT_TASK logic. 3062 * 3063 * From there, core_scsi3_release_preempt_and_abort() will 3064 * release every registration in the list (which have already 3065 * been removed from the primary pr_reg list), except the 3066 * new persistent reservation holder, the calling Initiator Port. 3067 */ 3068 if (preempt_type == PREEMPT_AND_ABORT) { 3069 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3070 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3071 pr_reg_n); 3072 } 3073 3074 if (pr_tmpl->pr_aptpl_active) 3075 core_scsi3_update_and_write_aptpl(cmd->se_dev, true); 3076 3077 core_scsi3_put_pr_reg(pr_reg_n); 3078 core_scsi3_pr_generation(cmd->se_dev); 3079 return 0; 3080 } 3081 3082 static sense_reason_t 3083 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, 3084 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type) 3085 { 3086 switch (type) { 3087 case PR_TYPE_WRITE_EXCLUSIVE: 3088 case PR_TYPE_EXCLUSIVE_ACCESS: 3089 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3090 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3091 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3092 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3093 return core_scsi3_pro_preempt(cmd, type, scope, res_key, 3094 sa_res_key, preempt_type); 3095 default: 3096 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3097 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type); 3098 return TCM_INVALID_CDB_FIELD; 3099 } 3100 } 3101 3102 3103 static sense_reason_t 3104 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, 3105 u64 sa_res_key, int aptpl, int unreg) 3106 { 3107 struct se_session *se_sess = cmd->se_sess; 3108 struct se_device *dev = cmd->se_dev; 3109 struct se_dev_entry *dest_se_deve = NULL; 3110 struct se_lun *se_lun = cmd->se_lun; 3111 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3112 struct se_port *se_port; 3113 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3114 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3115 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3116 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3117 unsigned char *buf; 3118 unsigned char *initiator_str; 3119 char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN]; 3120 u32 tid_len, tmp_tid_len; 3121 int new_reg = 0, type, scope, matching_iname; 3122 sense_reason_t ret; 3123 unsigned short rtpi; 3124 unsigned char proto_ident; 3125 3126 if (!se_sess || !se_lun) { 3127 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3128 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3129 } 3130 3131 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3132 se_tpg = se_sess->se_tpg; 3133 tf_ops = se_tpg->se_tpg_tfo; 3134 /* 3135 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3136 * Register behaviors for a REGISTER AND MOVE service action 3137 * 3138 * Locate the existing *pr_reg via struct se_node_acl pointers 3139 */ 3140 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3141 se_sess); 3142 if (!pr_reg) { 3143 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3144 " *pr_reg for REGISTER_AND_MOVE\n"); 3145 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3146 } 3147 /* 3148 * The provided reservation key much match the existing reservation key 3149 * provided during this initiator's I_T nexus registration. 3150 */ 3151 if (res_key != pr_reg->pr_res_key) { 3152 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3153 " res_key: 0x%016Lx does not match existing SA REGISTER" 3154 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3155 ret = TCM_RESERVATION_CONFLICT; 3156 goto out_put_pr_reg; 3157 } 3158 /* 3159 * The service active reservation key needs to be non zero 3160 */ 3161 if (!sa_res_key) { 3162 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3163 " sa_res_key\n"); 3164 ret = TCM_INVALID_PARAMETER_LIST; 3165 goto out_put_pr_reg; 3166 } 3167 3168 /* 3169 * Determine the Relative Target Port Identifier where the reservation 3170 * will be moved to for the TransportID containing SCSI initiator WWN 3171 * information. 3172 */ 3173 buf = transport_kmap_data_sg(cmd); 3174 if (!buf) { 3175 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3176 goto out_put_pr_reg; 3177 } 3178 3179 rtpi = (buf[18] & 0xff) << 8; 3180 rtpi |= buf[19] & 0xff; 3181 tid_len = (buf[20] & 0xff) << 24; 3182 tid_len |= (buf[21] & 0xff) << 16; 3183 tid_len |= (buf[22] & 0xff) << 8; 3184 tid_len |= buf[23] & 0xff; 3185 transport_kunmap_data_sg(cmd); 3186 buf = NULL; 3187 3188 if ((tid_len + 24) != cmd->data_length) { 3189 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3190 " does not equal CDB data_length: %u\n", tid_len, 3191 cmd->data_length); 3192 ret = TCM_INVALID_PARAMETER_LIST; 3193 goto out_put_pr_reg; 3194 } 3195 3196 spin_lock(&dev->se_port_lock); 3197 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3198 if (se_port->sep_rtpi != rtpi) 3199 continue; 3200 dest_se_tpg = se_port->sep_tpg; 3201 if (!dest_se_tpg) 3202 continue; 3203 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3204 if (!dest_tf_ops) 3205 continue; 3206 3207 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count); 3208 spin_unlock(&dev->se_port_lock); 3209 3210 if (core_scsi3_tpg_depend_item(dest_se_tpg)) { 3211 pr_err("core_scsi3_tpg_depend_item() failed" 3212 " for dest_se_tpg\n"); 3213 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count); 3214 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3215 goto out_put_pr_reg; 3216 } 3217 3218 spin_lock(&dev->se_port_lock); 3219 break; 3220 } 3221 spin_unlock(&dev->se_port_lock); 3222 3223 if (!dest_se_tpg || !dest_tf_ops) { 3224 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3225 " fabric ops from Relative Target Port Identifier:" 3226 " %hu\n", rtpi); 3227 ret = TCM_INVALID_PARAMETER_LIST; 3228 goto out_put_pr_reg; 3229 } 3230 3231 buf = transport_kmap_data_sg(cmd); 3232 if (!buf) { 3233 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3234 goto out_put_pr_reg; 3235 } 3236 proto_ident = (buf[24] & 0x0f); 3237 3238 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3239 " 0x%02x\n", proto_ident); 3240 3241 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3242 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3243 " proto_ident: 0x%02x does not match ident: 0x%02x" 3244 " from fabric: %s\n", proto_ident, 3245 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3246 dest_tf_ops->get_fabric_name()); 3247 ret = TCM_INVALID_PARAMETER_LIST; 3248 goto out; 3249 } 3250 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3251 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3252 " containg a valid tpg_parse_pr_out_transport_id" 3253 " function pointer\n"); 3254 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3255 goto out; 3256 } 3257 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3258 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3259 if (!initiator_str) { 3260 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3261 " initiator_str from Transport ID\n"); 3262 ret = TCM_INVALID_PARAMETER_LIST; 3263 goto out; 3264 } 3265 3266 transport_kunmap_data_sg(cmd); 3267 buf = NULL; 3268 3269 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3270 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3271 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3272 iport_ptr : ""); 3273 /* 3274 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3275 * action specifies a TransportID that is the same as the initiator port 3276 * of the I_T nexus for the command received, then the command shall 3277 * be terminated with CHECK CONDITION status, with the sense key set to 3278 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3279 * IN PARAMETER LIST. 3280 */ 3281 pr_reg_nacl = pr_reg->pr_reg_nacl; 3282 matching_iname = (!strcmp(initiator_str, 3283 pr_reg_nacl->initiatorname)) ? 1 : 0; 3284 if (!matching_iname) 3285 goto after_iport_check; 3286 3287 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3288 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3289 " matches: %s on received I_T Nexus\n", initiator_str, 3290 pr_reg_nacl->initiatorname); 3291 ret = TCM_INVALID_PARAMETER_LIST; 3292 goto out; 3293 } 3294 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3295 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3296 " matches: %s %s on received I_T Nexus\n", 3297 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3298 pr_reg->pr_reg_isid); 3299 ret = TCM_INVALID_PARAMETER_LIST; 3300 goto out; 3301 } 3302 after_iport_check: 3303 /* 3304 * Locate the destination struct se_node_acl from the received Transport ID 3305 */ 3306 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3307 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3308 initiator_str); 3309 if (dest_node_acl) 3310 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count); 3311 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3312 3313 if (!dest_node_acl) { 3314 pr_err("Unable to locate %s dest_node_acl for" 3315 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3316 initiator_str); 3317 ret = TCM_INVALID_PARAMETER_LIST; 3318 goto out; 3319 } 3320 3321 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) { 3322 pr_err("core_scsi3_nodeacl_depend_item() for" 3323 " dest_node_acl\n"); 3324 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count); 3325 dest_node_acl = NULL; 3326 ret = TCM_INVALID_PARAMETER_LIST; 3327 goto out; 3328 } 3329 3330 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3331 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3332 dest_node_acl->initiatorname); 3333 3334 /* 3335 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3336 * PORT IDENTIFIER. 3337 */ 3338 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3339 if (!dest_se_deve) { 3340 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3341 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3342 ret = TCM_INVALID_PARAMETER_LIST; 3343 goto out; 3344 } 3345 3346 if (core_scsi3_lunacl_depend_item(dest_se_deve)) { 3347 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3348 atomic_dec_mb(&dest_se_deve->pr_ref_count); 3349 dest_se_deve = NULL; 3350 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3351 goto out; 3352 } 3353 3354 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3355 " ACL for dest_se_deve->mapped_lun: %u\n", 3356 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3357 dest_se_deve->mapped_lun); 3358 3359 /* 3360 * A persistent reservation needs to already existing in order to 3361 * successfully complete the REGISTER_AND_MOVE service action.. 3362 */ 3363 spin_lock(&dev->dev_reservation_lock); 3364 pr_res_holder = dev->dev_pr_res_holder; 3365 if (!pr_res_holder) { 3366 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3367 " currently held\n"); 3368 spin_unlock(&dev->dev_reservation_lock); 3369 ret = TCM_INVALID_CDB_FIELD; 3370 goto out; 3371 } 3372 /* 3373 * The received on I_T Nexus must be the reservation holder. 3374 * 3375 * From spc4r17 section 5.7.8 Table 50 -- 3376 * Register behaviors for a REGISTER AND MOVE service action 3377 */ 3378 if (pr_res_holder != pr_reg) { 3379 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3380 " Nexus is not reservation holder\n"); 3381 spin_unlock(&dev->dev_reservation_lock); 3382 ret = TCM_RESERVATION_CONFLICT; 3383 goto out; 3384 } 3385 /* 3386 * From spc4r17 section 5.7.8: registering and moving reservation 3387 * 3388 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3389 * action is received and the established persistent reservation is a 3390 * Write Exclusive - All Registrants type or Exclusive Access - 3391 * All Registrants type reservation, then the command shall be completed 3392 * with RESERVATION CONFLICT status. 3393 */ 3394 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3395 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3396 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3397 " reservation for type: %s\n", 3398 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3399 spin_unlock(&dev->dev_reservation_lock); 3400 ret = TCM_RESERVATION_CONFLICT; 3401 goto out; 3402 } 3403 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3404 /* 3405 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3406 */ 3407 type = pr_res_holder->pr_res_type; 3408 scope = pr_res_holder->pr_res_type; 3409 /* 3410 * c) Associate the reservation key specified in the SERVICE ACTION 3411 * RESERVATION KEY field with the I_T nexus specified as the 3412 * destination of the register and move, where: 3413 * A) The I_T nexus is specified by the TransportID and the 3414 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3415 * B) Regardless of the TransportID format used, the association for 3416 * the initiator port is based on either the initiator port name 3417 * (see 3.1.71) on SCSI transport protocols where port names are 3418 * required or the initiator port identifier (see 3.1.70) on SCSI 3419 * transport protocols where port names are not required; 3420 * d) Register the reservation key specified in the SERVICE ACTION 3421 * RESERVATION KEY field; 3422 * e) Retain the reservation key specified in the SERVICE ACTION 3423 * RESERVATION KEY field and associated information; 3424 * 3425 * Also, It is not an error for a REGISTER AND MOVE service action to 3426 * register an I_T nexus that is already registered with the same 3427 * reservation key or a different reservation key. 3428 */ 3429 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3430 iport_ptr); 3431 if (!dest_pr_reg) { 3432 if (core_scsi3_alloc_registration(cmd->se_dev, 3433 dest_node_acl, dest_se_deve, iport_ptr, 3434 sa_res_key, 0, aptpl, 2, 1)) { 3435 spin_unlock(&dev->dev_reservation_lock); 3436 ret = TCM_INVALID_PARAMETER_LIST; 3437 goto out; 3438 } 3439 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3440 iport_ptr); 3441 new_reg = 1; 3442 } 3443 /* 3444 * f) Release the persistent reservation for the persistent reservation 3445 * holder (i.e., the I_T nexus on which the 3446 */ 3447 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3448 dev->dev_pr_res_holder, 0, 0); 3449 /* 3450 * g) Move the persistent reservation to the specified I_T nexus using 3451 * the same scope and type as the persistent reservation released in 3452 * item f); and 3453 */ 3454 dev->dev_pr_res_holder = dest_pr_reg; 3455 dest_pr_reg->pr_res_holder = 1; 3456 dest_pr_reg->pr_res_type = type; 3457 pr_reg->pr_res_scope = scope; 3458 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN); 3459 /* 3460 * Increment PRGeneration for existing registrations.. 3461 */ 3462 if (!new_reg) 3463 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3464 spin_unlock(&dev->dev_reservation_lock); 3465 3466 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3467 " created new reservation holder TYPE: %s on object RTPI:" 3468 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3469 core_scsi3_pr_dump_type(type), rtpi, 3470 dest_pr_reg->pr_res_generation); 3471 pr_debug("SPC-3 PR Successfully moved reservation from" 3472 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3473 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3474 i_buf, dest_tf_ops->get_fabric_name(), 3475 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3476 iport_ptr : ""); 3477 /* 3478 * It is now safe to release configfs group dependencies for destination 3479 * of Transport ID Initiator Device/Port Identifier 3480 */ 3481 core_scsi3_lunacl_undepend_item(dest_se_deve); 3482 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3483 core_scsi3_tpg_undepend_item(dest_se_tpg); 3484 /* 3485 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3486 * nexus on which PERSISTENT RESERVE OUT command was received. 3487 */ 3488 if (unreg) { 3489 spin_lock(&pr_tmpl->registration_lock); 3490 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3491 spin_unlock(&pr_tmpl->registration_lock); 3492 } else 3493 core_scsi3_put_pr_reg(pr_reg); 3494 3495 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); 3496 3497 transport_kunmap_data_sg(cmd); 3498 3499 core_scsi3_put_pr_reg(dest_pr_reg); 3500 return 0; 3501 out: 3502 if (buf) 3503 transport_kunmap_data_sg(cmd); 3504 if (dest_se_deve) 3505 core_scsi3_lunacl_undepend_item(dest_se_deve); 3506 if (dest_node_acl) 3507 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3508 core_scsi3_tpg_undepend_item(dest_se_tpg); 3509 3510 out_put_pr_reg: 3511 core_scsi3_put_pr_reg(pr_reg); 3512 return ret; 3513 } 3514 3515 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3516 { 3517 unsigned int __v1, __v2; 3518 3519 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3520 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3521 3522 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3523 } 3524 3525 /* 3526 * See spc4r17 section 6.14 Table 170 3527 */ 3528 sense_reason_t 3529 target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3530 { 3531 struct se_device *dev = cmd->se_dev; 3532 unsigned char *cdb = &cmd->t_task_cdb[0]; 3533 unsigned char *buf; 3534 u64 res_key, sa_res_key; 3535 int sa, scope, type, aptpl; 3536 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3537 sense_reason_t ret; 3538 3539 /* 3540 * Following spc2r20 5.5.1 Reservations overview: 3541 * 3542 * If a logical unit has been reserved by any RESERVE command and is 3543 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3544 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3545 * initiator or service action and shall terminate with a RESERVATION 3546 * CONFLICT status. 3547 */ 3548 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 3549 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3550 " SPC-2 reservation is held, returning" 3551 " RESERVATION_CONFLICT\n"); 3552 return TCM_RESERVATION_CONFLICT; 3553 } 3554 3555 /* 3556 * FIXME: A NULL struct se_session pointer means an this is not coming from 3557 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3558 */ 3559 if (!cmd->se_sess) 3560 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3561 3562 if (cmd->data_length < 24) { 3563 pr_warn("SPC-PR: Received PR OUT parameter list" 3564 " length too small: %u\n", cmd->data_length); 3565 return TCM_INVALID_PARAMETER_LIST; 3566 } 3567 3568 /* 3569 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3570 */ 3571 sa = (cdb[1] & 0x1f); 3572 scope = (cdb[2] & 0xf0); 3573 type = (cdb[2] & 0x0f); 3574 3575 buf = transport_kmap_data_sg(cmd); 3576 if (!buf) 3577 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3578 3579 /* 3580 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3581 */ 3582 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3583 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3584 /* 3585 * REGISTER_AND_MOVE uses a different SA parameter list containing 3586 * SCSI TransportIDs. 3587 */ 3588 if (sa != PRO_REGISTER_AND_MOVE) { 3589 spec_i_pt = (buf[20] & 0x08); 3590 all_tg_pt = (buf[20] & 0x04); 3591 aptpl = (buf[20] & 0x01); 3592 } else { 3593 aptpl = (buf[17] & 0x01); 3594 unreg = (buf[17] & 0x02); 3595 } 3596 /* 3597 * If the backend device has been configured to force APTPL metadata 3598 * write-out, go ahead and propigate aptpl=1 down now. 3599 */ 3600 if (dev->dev_attrib.force_pr_aptpl) 3601 aptpl = 1; 3602 3603 transport_kunmap_data_sg(cmd); 3604 buf = NULL; 3605 3606 /* 3607 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3608 */ 3609 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) 3610 return TCM_INVALID_PARAMETER_LIST; 3611 3612 /* 3613 * From spc4r17 section 6.14: 3614 * 3615 * If the SPEC_I_PT bit is set to zero, the service action is not 3616 * REGISTER AND MOVE, and the parameter list length is not 24, then 3617 * the command shall be terminated with CHECK CONDITION status, with 3618 * the sense key set to ILLEGAL REQUEST, and the additional sense 3619 * code set to PARAMETER LIST LENGTH ERROR. 3620 */ 3621 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3622 (cmd->data_length != 24)) { 3623 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3624 " list length: %u\n", cmd->data_length); 3625 return TCM_INVALID_PARAMETER_LIST; 3626 } 3627 3628 /* 3629 * (core_scsi3_emulate_pro_* function parameters 3630 * are defined by spc4r17 Table 174: 3631 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3632 */ 3633 switch (sa) { 3634 case PRO_REGISTER: 3635 ret = core_scsi3_emulate_pro_register(cmd, 3636 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER); 3637 break; 3638 case PRO_RESERVE: 3639 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3640 break; 3641 case PRO_RELEASE: 3642 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3643 break; 3644 case PRO_CLEAR: 3645 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3646 break; 3647 case PRO_PREEMPT: 3648 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3649 res_key, sa_res_key, PREEMPT); 3650 break; 3651 case PRO_PREEMPT_AND_ABORT: 3652 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3653 res_key, sa_res_key, PREEMPT_AND_ABORT); 3654 break; 3655 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3656 ret = core_scsi3_emulate_pro_register(cmd, 3657 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY); 3658 break; 3659 case PRO_REGISTER_AND_MOVE: 3660 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3661 sa_res_key, aptpl, unreg); 3662 break; 3663 default: 3664 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3665 " action: 0x%02x\n", cdb[1] & 0x1f); 3666 return TCM_INVALID_CDB_FIELD; 3667 } 3668 3669 if (!ret) 3670 target_complete_cmd(cmd, GOOD); 3671 return ret; 3672 } 3673 3674 /* 3675 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3676 * 3677 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3678 */ 3679 static sense_reason_t 3680 core_scsi3_pri_read_keys(struct se_cmd *cmd) 3681 { 3682 struct se_device *dev = cmd->se_dev; 3683 struct t10_pr_registration *pr_reg; 3684 unsigned char *buf; 3685 u32 add_len = 0, off = 8; 3686 3687 if (cmd->data_length < 8) { 3688 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3689 " too small\n", cmd->data_length); 3690 return TCM_INVALID_CDB_FIELD; 3691 } 3692 3693 buf = transport_kmap_data_sg(cmd); 3694 if (!buf) 3695 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3696 3697 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3698 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3699 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3700 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3701 3702 spin_lock(&dev->t10_pr.registration_lock); 3703 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list, 3704 pr_reg_list) { 3705 /* 3706 * Check for overflow of 8byte PRI READ_KEYS payload and 3707 * next reservation key list descriptor. 3708 */ 3709 if ((add_len + 8) > (cmd->data_length - 8)) 3710 break; 3711 3712 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3713 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3714 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3715 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3716 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3717 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3718 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3719 buf[off++] = (pr_reg->pr_res_key & 0xff); 3720 3721 add_len += 8; 3722 } 3723 spin_unlock(&dev->t10_pr.registration_lock); 3724 3725 buf[4] = ((add_len >> 24) & 0xff); 3726 buf[5] = ((add_len >> 16) & 0xff); 3727 buf[6] = ((add_len >> 8) & 0xff); 3728 buf[7] = (add_len & 0xff); 3729 3730 transport_kunmap_data_sg(cmd); 3731 3732 return 0; 3733 } 3734 3735 /* 3736 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 3737 * 3738 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 3739 */ 3740 static sense_reason_t 3741 core_scsi3_pri_read_reservation(struct se_cmd *cmd) 3742 { 3743 struct se_device *dev = cmd->se_dev; 3744 struct t10_pr_registration *pr_reg; 3745 unsigned char *buf; 3746 u64 pr_res_key; 3747 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 3748 3749 if (cmd->data_length < 8) { 3750 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 3751 " too small\n", cmd->data_length); 3752 return TCM_INVALID_CDB_FIELD; 3753 } 3754 3755 buf = transport_kmap_data_sg(cmd); 3756 if (!buf) 3757 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3758 3759 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3760 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3761 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3762 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3763 3764 spin_lock(&dev->dev_reservation_lock); 3765 pr_reg = dev->dev_pr_res_holder; 3766 if (pr_reg) { 3767 /* 3768 * Set the hardcoded Additional Length 3769 */ 3770 buf[4] = ((add_len >> 24) & 0xff); 3771 buf[5] = ((add_len >> 16) & 0xff); 3772 buf[6] = ((add_len >> 8) & 0xff); 3773 buf[7] = (add_len & 0xff); 3774 3775 if (cmd->data_length < 22) 3776 goto err; 3777 3778 /* 3779 * Set the Reservation key. 3780 * 3781 * From spc4r17, section 5.7.10: 3782 * A persistent reservation holder has its reservation key 3783 * returned in the parameter data from a PERSISTENT 3784 * RESERVE IN command with READ RESERVATION service action as 3785 * follows: 3786 * a) For a persistent reservation of the type Write Exclusive 3787 * - All Registrants or Exclusive Access All Regitrants, 3788 * the reservation key shall be set to zero; or 3789 * b) For all other persistent reservation types, the 3790 * reservation key shall be set to the registered 3791 * reservation key for the I_T nexus that holds the 3792 * persistent reservation. 3793 */ 3794 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3795 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 3796 pr_res_key = 0; 3797 else 3798 pr_res_key = pr_reg->pr_res_key; 3799 3800 buf[8] = ((pr_res_key >> 56) & 0xff); 3801 buf[9] = ((pr_res_key >> 48) & 0xff); 3802 buf[10] = ((pr_res_key >> 40) & 0xff); 3803 buf[11] = ((pr_res_key >> 32) & 0xff); 3804 buf[12] = ((pr_res_key >> 24) & 0xff); 3805 buf[13] = ((pr_res_key >> 16) & 0xff); 3806 buf[14] = ((pr_res_key >> 8) & 0xff); 3807 buf[15] = (pr_res_key & 0xff); 3808 /* 3809 * Set the SCOPE and TYPE 3810 */ 3811 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 3812 (pr_reg->pr_res_type & 0x0f); 3813 } 3814 3815 err: 3816 spin_unlock(&dev->dev_reservation_lock); 3817 transport_kunmap_data_sg(cmd); 3818 3819 return 0; 3820 } 3821 3822 /* 3823 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 3824 * 3825 * See spc4r17 section 6.13.4 Table 165 3826 */ 3827 static sense_reason_t 3828 core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 3829 { 3830 struct se_device *dev = cmd->se_dev; 3831 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3832 unsigned char *buf; 3833 u16 add_len = 8; /* Hardcoded to 8. */ 3834 3835 if (cmd->data_length < 6) { 3836 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 3837 " %u too small\n", cmd->data_length); 3838 return TCM_INVALID_CDB_FIELD; 3839 } 3840 3841 buf = transport_kmap_data_sg(cmd); 3842 if (!buf) 3843 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3844 3845 buf[0] = ((add_len >> 8) & 0xff); 3846 buf[1] = (add_len & 0xff); 3847 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 3848 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 3849 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 3850 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 3851 /* 3852 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 3853 * set the TMV: Task Mask Valid bit. 3854 */ 3855 buf[3] |= 0x80; 3856 /* 3857 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 3858 */ 3859 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 3860 /* 3861 * PTPL_A: Persistence across Target Power Loss Active bit 3862 */ 3863 if (pr_tmpl->pr_aptpl_active) 3864 buf[3] |= 0x01; 3865 /* 3866 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 3867 */ 3868 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3869 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 3870 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 3871 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 3872 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 3873 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 3874 3875 transport_kunmap_data_sg(cmd); 3876 3877 return 0; 3878 } 3879 3880 /* 3881 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 3882 * 3883 * See spc4r17 section 6.13.5 Table 168 and 169 3884 */ 3885 static sense_reason_t 3886 core_scsi3_pri_read_full_status(struct se_cmd *cmd) 3887 { 3888 struct se_device *dev = cmd->se_dev; 3889 struct se_node_acl *se_nacl; 3890 struct se_portal_group *se_tpg; 3891 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 3892 struct t10_reservation *pr_tmpl = &dev->t10_pr; 3893 unsigned char *buf; 3894 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 3895 u32 off = 8; /* off into first Full Status descriptor */ 3896 int format_code = 0, pr_res_type = 0, pr_res_scope = 0; 3897 bool all_reg = false; 3898 3899 if (cmd->data_length < 8) { 3900 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 3901 " too small\n", cmd->data_length); 3902 return TCM_INVALID_CDB_FIELD; 3903 } 3904 3905 buf = transport_kmap_data_sg(cmd); 3906 if (!buf) 3907 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3908 3909 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); 3910 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); 3911 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); 3912 buf[3] = (dev->t10_pr.pr_generation & 0xff); 3913 3914 spin_lock(&dev->dev_reservation_lock); 3915 if (dev->dev_pr_res_holder) { 3916 struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder; 3917 3918 if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || 3919 pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) { 3920 all_reg = true; 3921 pr_res_type = pr_holder->pr_res_type; 3922 pr_res_scope = pr_holder->pr_res_scope; 3923 } 3924 } 3925 spin_unlock(&dev->dev_reservation_lock); 3926 3927 spin_lock(&pr_tmpl->registration_lock); 3928 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3929 &pr_tmpl->registration_list, pr_reg_list) { 3930 3931 se_nacl = pr_reg->pr_reg_nacl; 3932 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 3933 add_desc_len = 0; 3934 3935 atomic_inc_mb(&pr_reg->pr_res_holders); 3936 spin_unlock(&pr_tmpl->registration_lock); 3937 /* 3938 * Determine expected length of $FABRIC_MOD specific 3939 * TransportID full status descriptor.. 3940 */ 3941 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 3942 se_tpg, se_nacl, pr_reg, &format_code); 3943 3944 if ((exp_desc_len + add_len) > cmd->data_length) { 3945 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 3946 " out of buffer: %d\n", cmd->data_length); 3947 spin_lock(&pr_tmpl->registration_lock); 3948 atomic_dec_mb(&pr_reg->pr_res_holders); 3949 break; 3950 } 3951 /* 3952 * Set RESERVATION KEY 3953 */ 3954 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3955 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3956 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3957 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3958 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3959 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3960 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3961 buf[off++] = (pr_reg->pr_res_key & 0xff); 3962 off += 4; /* Skip Over Reserved area */ 3963 3964 /* 3965 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 3966 */ 3967 if (pr_reg->pr_reg_all_tg_pt) 3968 buf[off] = 0x02; 3969 /* 3970 * The struct se_lun pointer will be present for the 3971 * reservation holder for PR_HOLDER bit. 3972 * 3973 * Also, if this registration is the reservation 3974 * holder or there is an All Registrants reservation 3975 * active, fill in SCOPE and TYPE in the next byte. 3976 */ 3977 if (pr_reg->pr_res_holder) { 3978 buf[off++] |= 0x01; 3979 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 3980 (pr_reg->pr_res_type & 0x0f); 3981 } else if (all_reg) { 3982 buf[off++] |= 0x01; 3983 buf[off++] = (pr_res_scope & 0xf0) | 3984 (pr_res_type & 0x0f); 3985 } else { 3986 off += 2; 3987 } 3988 3989 off += 4; /* Skip over reserved area */ 3990 /* 3991 * From spc4r17 6.3.15: 3992 * 3993 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 3994 * IDENTIFIER field contains the relative port identifier (see 3995 * 3.1.120) of the target port that is part of the I_T nexus 3996 * described by this full status descriptor. If the ALL_TG_PT 3997 * bit is set to one, the contents of the RELATIVE TARGET PORT 3998 * IDENTIFIER field are not defined by this standard. 3999 */ 4000 if (!pr_reg->pr_reg_all_tg_pt) { 4001 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4002 4003 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4004 buf[off++] = (port->sep_rtpi & 0xff); 4005 } else 4006 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */ 4007 4008 /* 4009 * Now, have the $FABRIC_MOD fill in the protocol identifier 4010 */ 4011 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4012 se_nacl, pr_reg, &format_code, &buf[off+4]); 4013 4014 spin_lock(&pr_tmpl->registration_lock); 4015 atomic_dec_mb(&pr_reg->pr_res_holders); 4016 /* 4017 * Set the ADDITIONAL DESCRIPTOR LENGTH 4018 */ 4019 buf[off++] = ((desc_len >> 24) & 0xff); 4020 buf[off++] = ((desc_len >> 16) & 0xff); 4021 buf[off++] = ((desc_len >> 8) & 0xff); 4022 buf[off++] = (desc_len & 0xff); 4023 /* 4024 * Size of full desctipor header minus TransportID 4025 * containing $FABRIC_MOD specific) initiator device/port 4026 * WWN information. 4027 * 4028 * See spc4r17 Section 6.13.5 Table 169 4029 */ 4030 add_desc_len = (24 + desc_len); 4031 4032 off += desc_len; 4033 add_len += add_desc_len; 4034 } 4035 spin_unlock(&pr_tmpl->registration_lock); 4036 /* 4037 * Set ADDITIONAL_LENGTH 4038 */ 4039 buf[4] = ((add_len >> 24) & 0xff); 4040 buf[5] = ((add_len >> 16) & 0xff); 4041 buf[6] = ((add_len >> 8) & 0xff); 4042 buf[7] = (add_len & 0xff); 4043 4044 transport_kunmap_data_sg(cmd); 4045 4046 return 0; 4047 } 4048 4049 sense_reason_t 4050 target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4051 { 4052 sense_reason_t ret; 4053 4054 /* 4055 * Following spc2r20 5.5.1 Reservations overview: 4056 * 4057 * If a logical unit has been reserved by any RESERVE command and is 4058 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4059 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4060 * initiator or service action and shall terminate with a RESERVATION 4061 * CONFLICT status. 4062 */ 4063 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) { 4064 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4065 " SPC-2 reservation is held, returning" 4066 " RESERVATION_CONFLICT\n"); 4067 return TCM_RESERVATION_CONFLICT; 4068 } 4069 4070 switch (cmd->t_task_cdb[1] & 0x1f) { 4071 case PRI_READ_KEYS: 4072 ret = core_scsi3_pri_read_keys(cmd); 4073 break; 4074 case PRI_READ_RESERVATION: 4075 ret = core_scsi3_pri_read_reservation(cmd); 4076 break; 4077 case PRI_REPORT_CAPABILITIES: 4078 ret = core_scsi3_pri_report_capabilities(cmd); 4079 break; 4080 case PRI_READ_FULL_STATUS: 4081 ret = core_scsi3_pri_read_full_status(cmd); 4082 break; 4083 default: 4084 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4085 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4086 return TCM_INVALID_CDB_FIELD; 4087 } 4088 4089 if (!ret) 4090 target_complete_cmd(cmd, GOOD); 4091 return ret; 4092 } 4093 4094 sense_reason_t 4095 target_check_reservation(struct se_cmd *cmd) 4096 { 4097 struct se_device *dev = cmd->se_dev; 4098 sense_reason_t ret; 4099 4100 if (!cmd->se_sess) 4101 return 0; 4102 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 4103 return 0; 4104 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 4105 return 0; 4106 4107 spin_lock(&dev->dev_reservation_lock); 4108 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) 4109 ret = target_scsi2_reservation_check(cmd); 4110 else 4111 ret = target_scsi3_pr_reservation_check(cmd); 4112 spin_unlock(&dev->dev_reservation_lock); 4113 4114 return ret; 4115 } 4116