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 * Copyright (c) 2009, 2010 Rising Tide Systems 8 * Copyright (c) 2009, 2010 Linux-iSCSI.org 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 25 * 26 ******************************************************************************/ 27 28 #include <linux/slab.h> 29 #include <linux/spinlock.h> 30 #include <linux/list.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 int 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 return 0; 63 64 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); 65 return 1; 66 } 67 68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 69 struct t10_pr_registration *, int); 70 71 static int core_scsi2_reservation_seq_non_holder( 72 struct se_cmd *cmd, 73 unsigned char *cdb, 74 u32 pr_reg_type) 75 { 76 switch (cdb[0]) { 77 case INQUIRY: 78 case RELEASE: 79 case RELEASE_10: 80 return 0; 81 default: 82 return 1; 83 } 84 85 return 1; 86 } 87 88 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type) 89 { 90 struct se_device *dev = cmd->se_dev; 91 struct se_session *sess = cmd->se_sess; 92 int ret; 93 94 if (!sess) 95 return 0; 96 97 spin_lock(&dev->dev_reservation_lock); 98 if (!dev->dev_reserved_node_acl || !sess) { 99 spin_unlock(&dev->dev_reservation_lock); 100 return 0; 101 } 102 if (dev->dev_reserved_node_acl != sess->se_node_acl) { 103 spin_unlock(&dev->dev_reservation_lock); 104 return -EINVAL; 105 } 106 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) { 107 spin_unlock(&dev->dev_reservation_lock); 108 return 0; 109 } 110 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL; 111 spin_unlock(&dev->dev_reservation_lock); 112 113 return ret; 114 } 115 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 117 struct se_node_acl *, struct se_session *); 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 119 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret) 121 { 122 struct se_session *se_sess = cmd->se_sess; 123 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 124 struct t10_pr_registration *pr_reg; 125 struct t10_reservation *pr_tmpl = &su_dev->t10_pr; 126 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS); 127 int conflict = 0; 128 129 if (!crh) 130 return false; 131 132 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 133 se_sess); 134 if (pr_reg) { 135 /* 136 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 137 * behavior 138 * 139 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 140 * status, but no reservation shall be established and the 141 * persistent reservation shall not be changed, if the command 142 * is received from a) and b) below. 143 * 144 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 145 * status, but the persistent reservation shall not be released, 146 * if the command is received from a) and b) 147 * 148 * a) An I_T nexus that is a persistent reservation holder; or 149 * b) An I_T nexus that is registered if a registrants only or 150 * all registrants type persistent reservation is present. 151 * 152 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 153 * RELEASE(6) command, or RELEASE(10) command shall be processed 154 * as defined in SPC-2. 155 */ 156 if (pr_reg->pr_res_holder) { 157 core_scsi3_put_pr_reg(pr_reg); 158 *ret = 0; 159 return false; 160 } 161 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 162 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 163 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 164 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 165 core_scsi3_put_pr_reg(pr_reg); 166 *ret = 0; 167 return true; 168 } 169 core_scsi3_put_pr_reg(pr_reg); 170 conflict = 1; 171 } else { 172 /* 173 * Following spc2r20 5.5.1 Reservations overview: 174 * 175 * If a logical unit has executed a PERSISTENT RESERVE OUT 176 * command with the REGISTER or the REGISTER AND IGNORE 177 * EXISTING KEY service action and is still registered by any 178 * initiator, all RESERVE commands and all RELEASE commands 179 * regardless of initiator shall conflict and shall terminate 180 * with a RESERVATION CONFLICT status. 181 */ 182 spin_lock(&pr_tmpl->registration_lock); 183 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 184 spin_unlock(&pr_tmpl->registration_lock); 185 } 186 187 if (conflict) { 188 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 189 " while active SPC-3 registrations exist," 190 " returning RESERVATION_CONFLICT\n"); 191 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 192 return true; 193 } 194 195 return false; 196 } 197 198 int target_scsi2_reservation_release(struct se_task *task) 199 { 200 struct se_cmd *cmd = task->task_se_cmd; 201 struct se_device *dev = cmd->se_dev; 202 struct se_session *sess = cmd->se_sess; 203 struct se_portal_group *tpg = sess->se_tpg; 204 int ret = 0; 205 206 if (!sess || !tpg) 207 goto out; 208 if (target_check_scsi2_reservation_conflict(cmd, &ret)) 209 goto out; 210 211 ret = 0; 212 spin_lock(&dev->dev_reservation_lock); 213 if (!dev->dev_reserved_node_acl || !sess) 214 goto out_unlock; 215 216 if (dev->dev_reserved_node_acl != sess->se_node_acl) 217 goto out_unlock; 218 219 dev->dev_reserved_node_acl = NULL; 220 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 221 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 222 dev->dev_res_bin_isid = 0; 223 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 224 } 225 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 226 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 227 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 228 sess->se_node_acl->initiatorname); 229 230 out_unlock: 231 spin_unlock(&dev->dev_reservation_lock); 232 out: 233 if (!ret) { 234 task->task_scsi_status = GOOD; 235 transport_complete_task(task, 1); 236 } 237 return ret; 238 } 239 240 int target_scsi2_reservation_reserve(struct se_task *task) 241 { 242 struct se_cmd *cmd = task->task_se_cmd; 243 struct se_device *dev = cmd->se_dev; 244 struct se_session *sess = cmd->se_sess; 245 struct se_portal_group *tpg = sess->se_tpg; 246 int ret = 0; 247 248 if ((cmd->t_task_cdb[1] & 0x01) && 249 (cmd->t_task_cdb[1] & 0x02)) { 250 pr_err("LongIO and Obselete Bits set, returning" 251 " ILLEGAL_REQUEST\n"); 252 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 253 ret = -EINVAL; 254 goto out; 255 } 256 /* 257 * This is currently the case for target_core_mod passthrough struct se_cmd 258 * ops 259 */ 260 if (!sess || !tpg) 261 goto out; 262 if (target_check_scsi2_reservation_conflict(cmd, &ret)) 263 goto out; 264 265 ret = 0; 266 spin_lock(&dev->dev_reservation_lock); 267 if (dev->dev_reserved_node_acl && 268 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 269 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 270 tpg->se_tpg_tfo->get_fabric_name()); 271 pr_err("Original reserver LUN: %u %s\n", 272 cmd->se_lun->unpacked_lun, 273 dev->dev_reserved_node_acl->initiatorname); 274 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 275 " from %s \n", cmd->se_lun->unpacked_lun, 276 cmd->se_deve->mapped_lun, 277 sess->se_node_acl->initiatorname); 278 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 279 ret = -EINVAL; 280 goto out_unlock; 281 } 282 283 dev->dev_reserved_node_acl = sess->se_node_acl; 284 dev->dev_flags |= DF_SPC2_RESERVATIONS; 285 if (sess->sess_bin_isid != 0) { 286 dev->dev_res_bin_isid = sess->sess_bin_isid; 287 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 288 } 289 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 290 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 291 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 292 sess->se_node_acl->initiatorname); 293 294 out_unlock: 295 spin_unlock(&dev->dev_reservation_lock); 296 out: 297 if (!ret) { 298 task->task_scsi_status = GOOD; 299 transport_complete_task(task, 1); 300 } 301 return ret; 302 } 303 304 305 /* 306 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 307 * 308 * This function is called by those initiator ports who are *NOT* 309 * the active PR reservation holder when a reservation is present. 310 */ 311 static int core_scsi3_pr_seq_non_holder( 312 struct se_cmd *cmd, 313 unsigned char *cdb, 314 u32 pr_reg_type) 315 { 316 struct se_dev_entry *se_deve; 317 struct se_session *se_sess = cmd->se_sess; 318 int other_cdb = 0, ignore_reg; 319 int registered_nexus = 0, ret = 1; /* Conflict by default */ 320 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 321 int we = 0; /* Write Exclusive */ 322 int legacy = 0; /* Act like a legacy device and return 323 * RESERVATION CONFLICT on some CDBs */ 324 /* 325 * A legacy SPC-2 reservation is being held. 326 */ 327 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 328 return core_scsi2_reservation_seq_non_holder(cmd, 329 cdb, pr_reg_type); 330 331 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 332 /* 333 * Determine if the registration should be ignored due to 334 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 335 */ 336 ignore_reg = (pr_reg_type & 0x80000000); 337 if (ignore_reg) 338 pr_reg_type &= ~0x80000000; 339 340 switch (pr_reg_type) { 341 case PR_TYPE_WRITE_EXCLUSIVE: 342 we = 1; 343 case PR_TYPE_EXCLUSIVE_ACCESS: 344 /* 345 * Some commands are only allowed for the persistent reservation 346 * holder. 347 */ 348 if ((se_deve->def_pr_registered) && !(ignore_reg)) 349 registered_nexus = 1; 350 break; 351 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 352 we = 1; 353 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 354 /* 355 * Some commands are only allowed for registered I_T Nexuses. 356 */ 357 reg_only = 1; 358 if ((se_deve->def_pr_registered) && !(ignore_reg)) 359 registered_nexus = 1; 360 break; 361 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 362 we = 1; 363 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 364 /* 365 * Each registered I_T Nexus is a reservation holder. 366 */ 367 all_reg = 1; 368 if ((se_deve->def_pr_registered) && !(ignore_reg)) 369 registered_nexus = 1; 370 break; 371 default: 372 return -EINVAL; 373 } 374 /* 375 * Referenced from spc4r17 table 45 for *NON* PR holder access 376 */ 377 switch (cdb[0]) { 378 case SECURITY_PROTOCOL_IN: 379 if (registered_nexus) 380 return 0; 381 ret = (we) ? 0 : 1; 382 break; 383 case MODE_SENSE: 384 case MODE_SENSE_10: 385 case READ_ATTRIBUTE: 386 case READ_BUFFER: 387 case RECEIVE_DIAGNOSTIC: 388 if (legacy) { 389 ret = 1; 390 break; 391 } 392 if (registered_nexus) { 393 ret = 0; 394 break; 395 } 396 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 397 break; 398 case PERSISTENT_RESERVE_OUT: 399 /* 400 * This follows PERSISTENT_RESERVE_OUT service actions that 401 * are allowed in the presence of various reservations. 402 * See spc4r17, table 46 403 */ 404 switch (cdb[1] & 0x1f) { 405 case PRO_CLEAR: 406 case PRO_PREEMPT: 407 case PRO_PREEMPT_AND_ABORT: 408 ret = (registered_nexus) ? 0 : 1; 409 break; 410 case PRO_REGISTER: 411 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 412 ret = 0; 413 break; 414 case PRO_REGISTER_AND_MOVE: 415 case PRO_RESERVE: 416 ret = 1; 417 break; 418 case PRO_RELEASE: 419 ret = (registered_nexus) ? 0 : 1; 420 break; 421 default: 422 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 423 " action: 0x%02x\n", cdb[1] & 0x1f); 424 return -EINVAL; 425 } 426 break; 427 case RELEASE: 428 case RELEASE_10: 429 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 430 ret = 0; 431 break; 432 case RESERVE: 433 case RESERVE_10: 434 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 435 ret = 0; 436 break; 437 case TEST_UNIT_READY: 438 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 439 break; 440 case MAINTENANCE_IN: 441 switch (cdb[1] & 0x1f) { 442 case MI_MANAGEMENT_PROTOCOL_IN: 443 if (registered_nexus) { 444 ret = 0; 445 break; 446 } 447 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 448 break; 449 case MI_REPORT_SUPPORTED_OPERATION_CODES: 450 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 451 if (legacy) { 452 ret = 1; 453 break; 454 } 455 if (registered_nexus) { 456 ret = 0; 457 break; 458 } 459 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 460 break; 461 case MI_REPORT_ALIASES: 462 case MI_REPORT_IDENTIFYING_INFORMATION: 463 case MI_REPORT_PRIORITY: 464 case MI_REPORT_TARGET_PGS: 465 case MI_REPORT_TIMESTAMP: 466 ret = 0; /* Allowed */ 467 break; 468 default: 469 pr_err("Unknown MI Service Action: 0x%02x\n", 470 (cdb[1] & 0x1f)); 471 return -EINVAL; 472 } 473 break; 474 case ACCESS_CONTROL_IN: 475 case ACCESS_CONTROL_OUT: 476 case INQUIRY: 477 case LOG_SENSE: 478 case READ_MEDIA_SERIAL_NUMBER: 479 case REPORT_LUNS: 480 case REQUEST_SENSE: 481 ret = 0; /*/ Allowed CDBs */ 482 break; 483 default: 484 other_cdb = 1; 485 break; 486 } 487 /* 488 * Case where the CDB is explicitly allowed in the above switch 489 * statement. 490 */ 491 if (!ret && !other_cdb) { 492 #if 0 493 pr_debug("Allowing explict CDB: 0x%02x for %s" 494 " reservation holder\n", cdb[0], 495 core_scsi3_pr_dump_type(pr_reg_type)); 496 #endif 497 return ret; 498 } 499 /* 500 * Check if write exclusive initiator ports *NOT* holding the 501 * WRITE_EXCLUSIVE_* reservation. 502 */ 503 if ((we) && !(registered_nexus)) { 504 if (cmd->data_direction == DMA_TO_DEVICE) { 505 /* 506 * Conflict for write exclusive 507 */ 508 pr_debug("%s Conflict for unregistered nexus" 509 " %s CDB: 0x%02x to %s reservation\n", 510 transport_dump_cmd_direction(cmd), 511 se_sess->se_node_acl->initiatorname, cdb[0], 512 core_scsi3_pr_dump_type(pr_reg_type)); 513 return 1; 514 } else { 515 /* 516 * Allow non WRITE CDBs for all Write Exclusive 517 * PR TYPEs to pass for registered and 518 * non-registered_nexuxes NOT holding the reservation. 519 * 520 * We only make noise for the unregisterd nexuses, 521 * as we expect registered non-reservation holding 522 * nexuses to issue CDBs. 523 */ 524 #if 0 525 if (!registered_nexus) { 526 pr_debug("Allowing implict CDB: 0x%02x" 527 " for %s reservation on unregistered" 528 " nexus\n", cdb[0], 529 core_scsi3_pr_dump_type(pr_reg_type)); 530 } 531 #endif 532 return 0; 533 } 534 } else if ((reg_only) || (all_reg)) { 535 if (registered_nexus) { 536 /* 537 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 538 * allow commands from registered nexuses. 539 */ 540 #if 0 541 pr_debug("Allowing implict CDB: 0x%02x for %s" 542 " reservation\n", cdb[0], 543 core_scsi3_pr_dump_type(pr_reg_type)); 544 #endif 545 return 0; 546 } 547 } 548 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 549 " for %s reservation\n", transport_dump_cmd_direction(cmd), 550 (registered_nexus) ? "" : "un", 551 se_sess->se_node_acl->initiatorname, cdb[0], 552 core_scsi3_pr_dump_type(pr_reg_type)); 553 554 return 1; /* Conflict by default */ 555 } 556 557 static u32 core_scsi3_pr_generation(struct se_device *dev) 558 { 559 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 560 u32 prg; 561 /* 562 * PRGeneration field shall contain the value of a 32-bit wrapping 563 * counter mainted by the device server. 564 * 565 * Note that this is done regardless of Active Persist across 566 * Target PowerLoss (APTPL) 567 * 568 * See spc4r17 section 6.3.12 READ_KEYS service action 569 */ 570 spin_lock(&dev->dev_reservation_lock); 571 prg = su_dev->t10_pr.pr_generation++; 572 spin_unlock(&dev->dev_reservation_lock); 573 574 return prg; 575 } 576 577 static int core_scsi3_pr_reservation_check( 578 struct se_cmd *cmd, 579 u32 *pr_reg_type) 580 { 581 struct se_device *dev = cmd->se_dev; 582 struct se_session *sess = cmd->se_sess; 583 int ret; 584 585 if (!sess) 586 return 0; 587 /* 588 * A legacy SPC-2 reservation is being held. 589 */ 590 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 591 return core_scsi2_reservation_check(cmd, pr_reg_type); 592 593 spin_lock(&dev->dev_reservation_lock); 594 if (!dev->dev_pr_res_holder) { 595 spin_unlock(&dev->dev_reservation_lock); 596 return 0; 597 } 598 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 599 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 600 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 601 spin_unlock(&dev->dev_reservation_lock); 602 return -EINVAL; 603 } 604 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 605 spin_unlock(&dev->dev_reservation_lock); 606 return 0; 607 } 608 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 609 sess->sess_bin_isid) ? 0 : -EINVAL; 610 /* 611 * Use bit in *pr_reg_type to notify ISID mismatch in 612 * core_scsi3_pr_seq_non_holder(). 613 */ 614 if (ret != 0) 615 *pr_reg_type |= 0x80000000; 616 spin_unlock(&dev->dev_reservation_lock); 617 618 return ret; 619 } 620 621 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 622 struct se_device *dev, 623 struct se_node_acl *nacl, 624 struct se_dev_entry *deve, 625 unsigned char *isid, 626 u64 sa_res_key, 627 int all_tg_pt, 628 int aptpl) 629 { 630 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 631 struct t10_pr_registration *pr_reg; 632 633 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 634 if (!pr_reg) { 635 pr_err("Unable to allocate struct t10_pr_registration\n"); 636 return NULL; 637 } 638 639 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 640 GFP_ATOMIC); 641 if (!pr_reg->pr_aptpl_buf) { 642 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 643 kmem_cache_free(t10_pr_reg_cache, pr_reg); 644 return NULL; 645 } 646 647 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 648 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 649 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 650 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 651 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 652 atomic_set(&pr_reg->pr_res_holders, 0); 653 pr_reg->pr_reg_nacl = nacl; 654 pr_reg->pr_reg_deve = deve; 655 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 656 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 657 pr_reg->pr_res_key = sa_res_key; 658 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 659 pr_reg->pr_reg_aptpl = aptpl; 660 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 661 /* 662 * If an ISID value for this SCSI Initiator Port exists, 663 * save it to the registration now. 664 */ 665 if (isid != NULL) { 666 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 667 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 668 pr_reg->isid_present_at_reg = 1; 669 } 670 671 return pr_reg; 672 } 673 674 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 675 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 676 677 /* 678 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 679 * modes. 680 */ 681 static struct t10_pr_registration *__core_scsi3_alloc_registration( 682 struct se_device *dev, 683 struct se_node_acl *nacl, 684 struct se_dev_entry *deve, 685 unsigned char *isid, 686 u64 sa_res_key, 687 int all_tg_pt, 688 int aptpl) 689 { 690 struct se_dev_entry *deve_tmp; 691 struct se_node_acl *nacl_tmp; 692 struct se_port *port, *port_tmp; 693 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 694 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 695 int ret; 696 /* 697 * Create a registration for the I_T Nexus upon which the 698 * PROUT REGISTER was received. 699 */ 700 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 701 sa_res_key, all_tg_pt, aptpl); 702 if (!pr_reg) 703 return NULL; 704 /* 705 * Return pointer to pr_reg for ALL_TG_PT=0 706 */ 707 if (!all_tg_pt) 708 return pr_reg; 709 /* 710 * Create list of matching SCSI Initiator Port registrations 711 * for ALL_TG_PT=1 712 */ 713 spin_lock(&dev->se_port_lock); 714 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 715 atomic_inc(&port->sep_tg_pt_ref_cnt); 716 smp_mb__after_atomic_inc(); 717 spin_unlock(&dev->se_port_lock); 718 719 spin_lock_bh(&port->sep_alua_lock); 720 list_for_each_entry(deve_tmp, &port->sep_alua_list, 721 alua_port_list) { 722 /* 723 * This pointer will be NULL for demo mode MappedLUNs 724 * that have not been make explict via a ConfigFS 725 * MappedLUN group for the SCSI Initiator Node ACL. 726 */ 727 if (!deve_tmp->se_lun_acl) 728 continue; 729 730 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 731 /* 732 * Skip the matching struct se_node_acl that is allocated 733 * above.. 734 */ 735 if (nacl == nacl_tmp) 736 continue; 737 /* 738 * Only perform PR registrations for target ports on 739 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 740 * arrived. 741 */ 742 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 743 continue; 744 /* 745 * Look for a matching Initiator Node ACL in ASCII format 746 */ 747 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 748 continue; 749 750 atomic_inc(&deve_tmp->pr_ref_count); 751 smp_mb__after_atomic_inc(); 752 spin_unlock_bh(&port->sep_alua_lock); 753 /* 754 * Grab a configfs group dependency that is released 755 * for the exception path at label out: below, or upon 756 * completion of adding ALL_TG_PT=1 registrations in 757 * __core_scsi3_add_registration() 758 */ 759 ret = core_scsi3_lunacl_depend_item(deve_tmp); 760 if (ret < 0) { 761 pr_err("core_scsi3_lunacl_depend" 762 "_item() failed\n"); 763 atomic_dec(&port->sep_tg_pt_ref_cnt); 764 smp_mb__after_atomic_dec(); 765 atomic_dec(&deve_tmp->pr_ref_count); 766 smp_mb__after_atomic_dec(); 767 goto out; 768 } 769 /* 770 * Located a matching SCSI Initiator Port on a different 771 * port, allocate the pr_reg_atp and attach it to the 772 * pr_reg->pr_reg_atp_list that will be processed once 773 * the original *pr_reg is processed in 774 * __core_scsi3_add_registration() 775 */ 776 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 777 nacl_tmp, deve_tmp, NULL, 778 sa_res_key, all_tg_pt, aptpl); 779 if (!pr_reg_atp) { 780 atomic_dec(&port->sep_tg_pt_ref_cnt); 781 smp_mb__after_atomic_dec(); 782 atomic_dec(&deve_tmp->pr_ref_count); 783 smp_mb__after_atomic_dec(); 784 core_scsi3_lunacl_undepend_item(deve_tmp); 785 goto out; 786 } 787 788 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 789 &pr_reg->pr_reg_atp_list); 790 spin_lock_bh(&port->sep_alua_lock); 791 } 792 spin_unlock_bh(&port->sep_alua_lock); 793 794 spin_lock(&dev->se_port_lock); 795 atomic_dec(&port->sep_tg_pt_ref_cnt); 796 smp_mb__after_atomic_dec(); 797 } 798 spin_unlock(&dev->se_port_lock); 799 800 return pr_reg; 801 out: 802 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 803 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 804 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 805 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 806 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 807 } 808 kmem_cache_free(t10_pr_reg_cache, pr_reg); 809 return NULL; 810 } 811 812 int core_scsi3_alloc_aptpl_registration( 813 struct t10_reservation *pr_tmpl, 814 u64 sa_res_key, 815 unsigned char *i_port, 816 unsigned char *isid, 817 u32 mapped_lun, 818 unsigned char *t_port, 819 u16 tpgt, 820 u32 target_lun, 821 int res_holder, 822 int all_tg_pt, 823 u8 type) 824 { 825 struct t10_pr_registration *pr_reg; 826 827 if (!i_port || !t_port || !sa_res_key) { 828 pr_err("Illegal parameters for APTPL registration\n"); 829 return -EINVAL; 830 } 831 832 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 833 if (!pr_reg) { 834 pr_err("Unable to allocate struct t10_pr_registration\n"); 835 return -ENOMEM; 836 } 837 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 838 839 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 840 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 841 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 842 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 843 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 844 atomic_set(&pr_reg->pr_res_holders, 0); 845 pr_reg->pr_reg_nacl = NULL; 846 pr_reg->pr_reg_deve = NULL; 847 pr_reg->pr_res_mapped_lun = mapped_lun; 848 pr_reg->pr_aptpl_target_lun = target_lun; 849 pr_reg->pr_res_key = sa_res_key; 850 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 851 pr_reg->pr_reg_aptpl = 1; 852 pr_reg->pr_reg_tg_pt_lun = NULL; 853 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 854 pr_reg->pr_res_type = type; 855 /* 856 * If an ISID value had been saved in APTPL metadata for this 857 * SCSI Initiator Port, restore it now. 858 */ 859 if (isid != NULL) { 860 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 861 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 862 pr_reg->isid_present_at_reg = 1; 863 } 864 /* 865 * Copy the i_port and t_port information from caller. 866 */ 867 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 868 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 869 pr_reg->pr_reg_tpgt = tpgt; 870 /* 871 * Set pr_res_holder from caller, the pr_reg who is the reservation 872 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 873 * the Initiator Node LUN ACL from the fabric module is created for 874 * this registration. 875 */ 876 pr_reg->pr_res_holder = res_holder; 877 878 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 879 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 880 " metadata\n", (res_holder) ? "+reservation" : ""); 881 return 0; 882 } 883 884 static void core_scsi3_aptpl_reserve( 885 struct se_device *dev, 886 struct se_portal_group *tpg, 887 struct se_node_acl *node_acl, 888 struct t10_pr_registration *pr_reg) 889 { 890 char i_buf[PR_REG_ISID_ID_LEN]; 891 int prf_isid; 892 893 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 894 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 895 PR_REG_ISID_ID_LEN); 896 897 spin_lock(&dev->dev_reservation_lock); 898 dev->dev_pr_res_holder = pr_reg; 899 spin_unlock(&dev->dev_reservation_lock); 900 901 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 902 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 903 tpg->se_tpg_tfo->get_fabric_name(), 904 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 905 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 906 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 907 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 908 (prf_isid) ? &i_buf[0] : ""); 909 } 910 911 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 912 struct t10_pr_registration *, int, int); 913 914 static int __core_scsi3_check_aptpl_registration( 915 struct se_device *dev, 916 struct se_portal_group *tpg, 917 struct se_lun *lun, 918 u32 target_lun, 919 struct se_node_acl *nacl, 920 struct se_dev_entry *deve) 921 { 922 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 923 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 924 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 925 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 926 u16 tpgt; 927 928 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 929 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 930 /* 931 * Copy Initiator Port information from struct se_node_acl 932 */ 933 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 934 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 935 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 936 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 937 /* 938 * Look for the matching registrations+reservation from those 939 * created from APTPL metadata. Note that multiple registrations 940 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 941 * TransportIDs. 942 */ 943 spin_lock(&pr_tmpl->aptpl_reg_lock); 944 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 945 pr_reg_aptpl_list) { 946 if (!strcmp(pr_reg->pr_iport, i_port) && 947 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 948 !(strcmp(pr_reg->pr_tport, t_port)) && 949 (pr_reg->pr_reg_tpgt == tpgt) && 950 (pr_reg->pr_aptpl_target_lun == target_lun)) { 951 952 pr_reg->pr_reg_nacl = nacl; 953 pr_reg->pr_reg_deve = deve; 954 pr_reg->pr_reg_tg_pt_lun = lun; 955 956 list_del(&pr_reg->pr_reg_aptpl_list); 957 spin_unlock(&pr_tmpl->aptpl_reg_lock); 958 /* 959 * At this point all of the pointers in *pr_reg will 960 * be setup, so go ahead and add the registration. 961 */ 962 963 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 964 /* 965 * If this registration is the reservation holder, 966 * make that happen now.. 967 */ 968 if (pr_reg->pr_res_holder) 969 core_scsi3_aptpl_reserve(dev, tpg, 970 nacl, pr_reg); 971 /* 972 * Reenable pr_aptpl_active to accept new metadata 973 * updates once the SCSI device is active again.. 974 */ 975 spin_lock(&pr_tmpl->aptpl_reg_lock); 976 pr_tmpl->pr_aptpl_active = 1; 977 } 978 } 979 spin_unlock(&pr_tmpl->aptpl_reg_lock); 980 981 return 0; 982 } 983 984 int core_scsi3_check_aptpl_registration( 985 struct se_device *dev, 986 struct se_portal_group *tpg, 987 struct se_lun *lun, 988 struct se_lun_acl *lun_acl) 989 { 990 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 991 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 992 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun]; 993 994 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 995 return 0; 996 997 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 998 lun->unpacked_lun, nacl, deve); 999 } 1000 1001 static void __core_scsi3_dump_registration( 1002 struct target_core_fabric_ops *tfo, 1003 struct se_device *dev, 1004 struct se_node_acl *nacl, 1005 struct t10_pr_registration *pr_reg, 1006 int register_type) 1007 { 1008 struct se_portal_group *se_tpg = nacl->se_tpg; 1009 char i_buf[PR_REG_ISID_ID_LEN]; 1010 int prf_isid; 1011 1012 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1013 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1014 PR_REG_ISID_ID_LEN); 1015 1016 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1017 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1018 "_AND_MOVE" : (register_type == 1) ? 1019 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1020 (prf_isid) ? i_buf : ""); 1021 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1022 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1023 tfo->tpg_get_tag(se_tpg)); 1024 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1025 " Port(s)\n", tfo->get_fabric_name(), 1026 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1027 dev->transport->name); 1028 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1029 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1030 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1031 pr_reg->pr_reg_aptpl); 1032 } 1033 1034 /* 1035 * this function can be called with struct se_device->dev_reservation_lock 1036 * when register_move = 1 1037 */ 1038 static void __core_scsi3_add_registration( 1039 struct se_device *dev, 1040 struct se_node_acl *nacl, 1041 struct t10_pr_registration *pr_reg, 1042 int register_type, 1043 int register_move) 1044 { 1045 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1046 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1047 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1048 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1049 1050 /* 1051 * Increment PRgeneration counter for struct se_device upon a successful 1052 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1053 * 1054 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1055 * action, the struct se_device->dev_reservation_lock will already be held, 1056 * so we do not call core_scsi3_pr_generation() which grabs the lock 1057 * for the REGISTER. 1058 */ 1059 pr_reg->pr_res_generation = (register_move) ? 1060 su_dev->t10_pr.pr_generation++ : 1061 core_scsi3_pr_generation(dev); 1062 1063 spin_lock(&pr_tmpl->registration_lock); 1064 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1065 pr_reg->pr_reg_deve->def_pr_registered = 1; 1066 1067 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1068 spin_unlock(&pr_tmpl->registration_lock); 1069 /* 1070 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1071 */ 1072 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1073 return; 1074 /* 1075 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1076 * allocated in __core_scsi3_alloc_registration() 1077 */ 1078 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1079 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1080 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1081 1082 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1083 1084 spin_lock(&pr_tmpl->registration_lock); 1085 list_add_tail(&pr_reg_tmp->pr_reg_list, 1086 &pr_tmpl->registration_list); 1087 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1088 1089 __core_scsi3_dump_registration(tfo, dev, 1090 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1091 register_type); 1092 spin_unlock(&pr_tmpl->registration_lock); 1093 /* 1094 * Drop configfs group dependency reference from 1095 * __core_scsi3_alloc_registration() 1096 */ 1097 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1098 } 1099 } 1100 1101 static int core_scsi3_alloc_registration( 1102 struct se_device *dev, 1103 struct se_node_acl *nacl, 1104 struct se_dev_entry *deve, 1105 unsigned char *isid, 1106 u64 sa_res_key, 1107 int all_tg_pt, 1108 int aptpl, 1109 int register_type, 1110 int register_move) 1111 { 1112 struct t10_pr_registration *pr_reg; 1113 1114 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1115 sa_res_key, all_tg_pt, aptpl); 1116 if (!pr_reg) 1117 return -EPERM; 1118 1119 __core_scsi3_add_registration(dev, nacl, pr_reg, 1120 register_type, register_move); 1121 return 0; 1122 } 1123 1124 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1125 struct se_device *dev, 1126 struct se_node_acl *nacl, 1127 unsigned char *isid) 1128 { 1129 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1130 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1131 struct se_portal_group *tpg; 1132 1133 spin_lock(&pr_tmpl->registration_lock); 1134 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1135 &pr_tmpl->registration_list, pr_reg_list) { 1136 /* 1137 * First look for a matching struct se_node_acl 1138 */ 1139 if (pr_reg->pr_reg_nacl != nacl) 1140 continue; 1141 1142 tpg = pr_reg->pr_reg_nacl->se_tpg; 1143 /* 1144 * If this registration does NOT contain a fabric provided 1145 * ISID, then we have found a match. 1146 */ 1147 if (!pr_reg->isid_present_at_reg) { 1148 /* 1149 * Determine if this SCSI device server requires that 1150 * SCSI Intiatior TransportID w/ ISIDs is enforced 1151 * for fabric modules (iSCSI) requiring them. 1152 */ 1153 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1154 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1155 continue; 1156 } 1157 atomic_inc(&pr_reg->pr_res_holders); 1158 smp_mb__after_atomic_inc(); 1159 spin_unlock(&pr_tmpl->registration_lock); 1160 return pr_reg; 1161 } 1162 /* 1163 * If the *pr_reg contains a fabric defined ISID for multi-value 1164 * SCSI Initiator Port TransportIDs, then we expect a valid 1165 * matching ISID to be provided by the local SCSI Initiator Port. 1166 */ 1167 if (!isid) 1168 continue; 1169 if (strcmp(isid, pr_reg->pr_reg_isid)) 1170 continue; 1171 1172 atomic_inc(&pr_reg->pr_res_holders); 1173 smp_mb__after_atomic_inc(); 1174 spin_unlock(&pr_tmpl->registration_lock); 1175 return pr_reg; 1176 } 1177 spin_unlock(&pr_tmpl->registration_lock); 1178 1179 return NULL; 1180 } 1181 1182 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1183 struct se_device *dev, 1184 struct se_node_acl *nacl, 1185 struct se_session *sess) 1186 { 1187 struct se_portal_group *tpg = nacl->se_tpg; 1188 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1189 1190 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1191 memset(&buf[0], 0, PR_REG_ISID_LEN); 1192 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1193 PR_REG_ISID_LEN); 1194 isid_ptr = &buf[0]; 1195 } 1196 1197 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1198 } 1199 1200 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1201 { 1202 atomic_dec(&pr_reg->pr_res_holders); 1203 smp_mb__after_atomic_dec(); 1204 } 1205 1206 static int core_scsi3_check_implict_release( 1207 struct se_device *dev, 1208 struct t10_pr_registration *pr_reg) 1209 { 1210 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1211 struct t10_pr_registration *pr_res_holder; 1212 int ret = 0; 1213 1214 spin_lock(&dev->dev_reservation_lock); 1215 pr_res_holder = dev->dev_pr_res_holder; 1216 if (!pr_res_holder) { 1217 spin_unlock(&dev->dev_reservation_lock); 1218 return ret; 1219 } 1220 if (pr_res_holder == pr_reg) { 1221 /* 1222 * Perform an implict RELEASE if the registration that 1223 * is being released is holding the reservation. 1224 * 1225 * From spc4r17, section 5.7.11.1: 1226 * 1227 * e) If the I_T nexus is the persistent reservation holder 1228 * and the persistent reservation is not an all registrants 1229 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1230 * service action or REGISTER AND IGNORE EXISTING KEY 1231 * service action with the SERVICE ACTION RESERVATION KEY 1232 * field set to zero (see 5.7.11.3). 1233 */ 1234 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1235 ret = 1; 1236 /* 1237 * For 'All Registrants' reservation types, all existing 1238 * registrations are still processed as reservation holders 1239 * in core_scsi3_pr_seq_non_holder() after the initial 1240 * reservation holder is implictly released here. 1241 */ 1242 } else if (pr_reg->pr_reg_all_tg_pt && 1243 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1244 pr_reg->pr_reg_nacl->initiatorname)) && 1245 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1246 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1247 " UNREGISTER while existing reservation with matching" 1248 " key 0x%016Lx is present from another SCSI Initiator" 1249 " Port\n", pr_reg->pr_res_key); 1250 ret = -EPERM; 1251 } 1252 spin_unlock(&dev->dev_reservation_lock); 1253 1254 return ret; 1255 } 1256 1257 /* 1258 * Called with struct t10_reservation->registration_lock held. 1259 */ 1260 static void __core_scsi3_free_registration( 1261 struct se_device *dev, 1262 struct t10_pr_registration *pr_reg, 1263 struct list_head *preempt_and_abort_list, 1264 int dec_holders) 1265 { 1266 struct target_core_fabric_ops *tfo = 1267 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1268 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1269 char i_buf[PR_REG_ISID_ID_LEN]; 1270 int prf_isid; 1271 1272 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1273 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1274 PR_REG_ISID_ID_LEN); 1275 1276 pr_reg->pr_reg_deve->def_pr_registered = 0; 1277 pr_reg->pr_reg_deve->pr_res_key = 0; 1278 list_del(&pr_reg->pr_reg_list); 1279 /* 1280 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1281 * so call core_scsi3_put_pr_reg() to decrement our reference. 1282 */ 1283 if (dec_holders) 1284 core_scsi3_put_pr_reg(pr_reg); 1285 /* 1286 * Wait until all reference from any other I_T nexuses for this 1287 * *pr_reg have been released. Because list_del() is called above, 1288 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1289 * count back to zero, and we release *pr_reg. 1290 */ 1291 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1292 spin_unlock(&pr_tmpl->registration_lock); 1293 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1294 tfo->get_fabric_name()); 1295 cpu_relax(); 1296 spin_lock(&pr_tmpl->registration_lock); 1297 } 1298 1299 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1300 " Node: %s%s\n", tfo->get_fabric_name(), 1301 pr_reg->pr_reg_nacl->initiatorname, 1302 (prf_isid) ? &i_buf[0] : ""); 1303 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1304 " Port(s)\n", tfo->get_fabric_name(), 1305 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1306 dev->transport->name); 1307 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1308 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1309 pr_reg->pr_res_generation); 1310 1311 if (!preempt_and_abort_list) { 1312 pr_reg->pr_reg_deve = NULL; 1313 pr_reg->pr_reg_nacl = NULL; 1314 kfree(pr_reg->pr_aptpl_buf); 1315 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1316 return; 1317 } 1318 /* 1319 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1320 * are released once the ABORT_TASK_SET has completed.. 1321 */ 1322 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1323 } 1324 1325 void core_scsi3_free_pr_reg_from_nacl( 1326 struct se_device *dev, 1327 struct se_node_acl *nacl) 1328 { 1329 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1330 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1331 /* 1332 * If the passed se_node_acl matches the reservation holder, 1333 * release the reservation. 1334 */ 1335 spin_lock(&dev->dev_reservation_lock); 1336 pr_res_holder = dev->dev_pr_res_holder; 1337 if ((pr_res_holder != NULL) && 1338 (pr_res_holder->pr_reg_nacl == nacl)) 1339 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1340 spin_unlock(&dev->dev_reservation_lock); 1341 /* 1342 * Release any registration associated with the struct se_node_acl. 1343 */ 1344 spin_lock(&pr_tmpl->registration_lock); 1345 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1346 &pr_tmpl->registration_list, pr_reg_list) { 1347 1348 if (pr_reg->pr_reg_nacl != nacl) 1349 continue; 1350 1351 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1352 } 1353 spin_unlock(&pr_tmpl->registration_lock); 1354 } 1355 1356 void core_scsi3_free_all_registrations( 1357 struct se_device *dev) 1358 { 1359 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1360 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1361 1362 spin_lock(&dev->dev_reservation_lock); 1363 pr_res_holder = dev->dev_pr_res_holder; 1364 if (pr_res_holder != NULL) { 1365 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1366 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1367 pr_res_holder, 0); 1368 } 1369 spin_unlock(&dev->dev_reservation_lock); 1370 1371 spin_lock(&pr_tmpl->registration_lock); 1372 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1373 &pr_tmpl->registration_list, pr_reg_list) { 1374 1375 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1376 } 1377 spin_unlock(&pr_tmpl->registration_lock); 1378 1379 spin_lock(&pr_tmpl->aptpl_reg_lock); 1380 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1381 pr_reg_aptpl_list) { 1382 list_del(&pr_reg->pr_reg_aptpl_list); 1383 kfree(pr_reg->pr_aptpl_buf); 1384 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1385 } 1386 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1387 } 1388 1389 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1390 { 1391 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1392 &tpg->tpg_group.cg_item); 1393 } 1394 1395 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1396 { 1397 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1398 &tpg->tpg_group.cg_item); 1399 1400 atomic_dec(&tpg->tpg_pr_ref_count); 1401 smp_mb__after_atomic_dec(); 1402 } 1403 1404 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1405 { 1406 struct se_portal_group *tpg = nacl->se_tpg; 1407 1408 if (nacl->dynamic_node_acl) 1409 return 0; 1410 1411 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1412 &nacl->acl_group.cg_item); 1413 } 1414 1415 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1416 { 1417 struct se_portal_group *tpg = nacl->se_tpg; 1418 1419 if (nacl->dynamic_node_acl) { 1420 atomic_dec(&nacl->acl_pr_ref_count); 1421 smp_mb__after_atomic_dec(); 1422 return; 1423 } 1424 1425 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1426 &nacl->acl_group.cg_item); 1427 1428 atomic_dec(&nacl->acl_pr_ref_count); 1429 smp_mb__after_atomic_dec(); 1430 } 1431 1432 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1433 { 1434 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1435 struct se_node_acl *nacl; 1436 struct se_portal_group *tpg; 1437 /* 1438 * For nacl->dynamic_node_acl=1 1439 */ 1440 if (!lun_acl) 1441 return 0; 1442 1443 nacl = lun_acl->se_lun_nacl; 1444 tpg = nacl->se_tpg; 1445 1446 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1447 &lun_acl->se_lun_group.cg_item); 1448 } 1449 1450 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1451 { 1452 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1453 struct se_node_acl *nacl; 1454 struct se_portal_group *tpg; 1455 /* 1456 * For nacl->dynamic_node_acl=1 1457 */ 1458 if (!lun_acl) { 1459 atomic_dec(&se_deve->pr_ref_count); 1460 smp_mb__after_atomic_dec(); 1461 return; 1462 } 1463 nacl = lun_acl->se_lun_nacl; 1464 tpg = nacl->se_tpg; 1465 1466 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1467 &lun_acl->se_lun_group.cg_item); 1468 1469 atomic_dec(&se_deve->pr_ref_count); 1470 smp_mb__after_atomic_dec(); 1471 } 1472 1473 static int core_scsi3_decode_spec_i_port( 1474 struct se_cmd *cmd, 1475 struct se_portal_group *tpg, 1476 unsigned char *l_isid, 1477 u64 sa_res_key, 1478 int all_tg_pt, 1479 int aptpl) 1480 { 1481 struct se_device *dev = cmd->se_dev; 1482 struct se_port *tmp_port; 1483 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1484 struct se_session *se_sess = cmd->se_sess; 1485 struct se_node_acl *dest_node_acl = NULL; 1486 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1487 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1488 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1489 struct list_head tid_dest_list; 1490 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1491 struct target_core_fabric_ops *tmp_tf_ops; 1492 unsigned char *buf; 1493 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1494 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1495 u32 tpdl, tid_len = 0; 1496 int ret, dest_local_nexus, prf_isid; 1497 u32 dest_rtpi = 0; 1498 1499 memset(dest_iport, 0, 64); 1500 INIT_LIST_HEAD(&tid_dest_list); 1501 1502 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1503 /* 1504 * Allocate a struct pr_transport_id_holder and setup the 1505 * local_node_acl and local_se_deve pointers and add to 1506 * struct list_head tid_dest_list for add registration 1507 * processing in the loop of tid_dest_list below. 1508 */ 1509 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1510 if (!tidh_new) { 1511 pr_err("Unable to allocate tidh_new\n"); 1512 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1513 return -EINVAL; 1514 } 1515 INIT_LIST_HEAD(&tidh_new->dest_list); 1516 tidh_new->dest_tpg = tpg; 1517 tidh_new->dest_node_acl = se_sess->se_node_acl; 1518 tidh_new->dest_se_deve = local_se_deve; 1519 1520 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1521 se_sess->se_node_acl, local_se_deve, l_isid, 1522 sa_res_key, all_tg_pt, aptpl); 1523 if (!local_pr_reg) { 1524 kfree(tidh_new); 1525 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1526 return -ENOMEM; 1527 } 1528 tidh_new->dest_pr_reg = local_pr_reg; 1529 /* 1530 * The local I_T nexus does not hold any configfs dependances, 1531 * so we set tid_h->dest_local_nexus=1 to prevent the 1532 * configfs_undepend_item() calls in the tid_dest_list loops below. 1533 */ 1534 tidh_new->dest_local_nexus = 1; 1535 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1536 1537 buf = transport_kmap_first_data_page(cmd); 1538 /* 1539 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1540 * first extract TransportID Parameter Data Length, and make sure 1541 * the value matches up to the SCSI expected data transfer length. 1542 */ 1543 tpdl = (buf[24] & 0xff) << 24; 1544 tpdl |= (buf[25] & 0xff) << 16; 1545 tpdl |= (buf[26] & 0xff) << 8; 1546 tpdl |= buf[27] & 0xff; 1547 1548 if ((tpdl + 28) != cmd->data_length) { 1549 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1550 " does not equal CDB data_length: %u\n", tpdl, 1551 cmd->data_length); 1552 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1553 ret = -EINVAL; 1554 goto out; 1555 } 1556 /* 1557 * Start processing the received transport IDs using the 1558 * receiving I_T Nexus portal's fabric dependent methods to 1559 * obtain the SCSI Initiator Port/Device Identifiers. 1560 */ 1561 ptr = &buf[28]; 1562 1563 while (tpdl > 0) { 1564 proto_ident = (ptr[0] & 0x0f); 1565 dest_tpg = NULL; 1566 1567 spin_lock(&dev->se_port_lock); 1568 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1569 tmp_tpg = tmp_port->sep_tpg; 1570 if (!tmp_tpg) 1571 continue; 1572 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1573 if (!tmp_tf_ops) 1574 continue; 1575 if (!tmp_tf_ops->get_fabric_proto_ident || 1576 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1577 continue; 1578 /* 1579 * Look for the matching proto_ident provided by 1580 * the received TransportID 1581 */ 1582 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1583 if (tmp_proto_ident != proto_ident) 1584 continue; 1585 dest_rtpi = tmp_port->sep_rtpi; 1586 1587 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1588 tmp_tpg, (const char *)ptr, &tid_len, 1589 &iport_ptr); 1590 if (!i_str) 1591 continue; 1592 1593 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1594 smp_mb__after_atomic_inc(); 1595 spin_unlock(&dev->se_port_lock); 1596 1597 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1598 if (ret != 0) { 1599 pr_err(" core_scsi3_tpg_depend_item()" 1600 " for tmp_tpg\n"); 1601 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1602 smp_mb__after_atomic_dec(); 1603 cmd->scsi_sense_reason = 1604 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1605 ret = -EINVAL; 1606 goto out; 1607 } 1608 /* 1609 * Locate the desination initiator ACL to be registered 1610 * from the decoded fabric module specific TransportID 1611 * at *i_str. 1612 */ 1613 spin_lock_irq(&tmp_tpg->acl_node_lock); 1614 dest_node_acl = __core_tpg_get_initiator_node_acl( 1615 tmp_tpg, i_str); 1616 if (dest_node_acl) { 1617 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1618 smp_mb__after_atomic_inc(); 1619 } 1620 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1621 1622 if (!dest_node_acl) { 1623 core_scsi3_tpg_undepend_item(tmp_tpg); 1624 spin_lock(&dev->se_port_lock); 1625 continue; 1626 } 1627 1628 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1629 if (ret != 0) { 1630 pr_err("configfs_depend_item() failed" 1631 " for dest_node_acl->acl_group\n"); 1632 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1633 smp_mb__after_atomic_dec(); 1634 core_scsi3_tpg_undepend_item(tmp_tpg); 1635 cmd->scsi_sense_reason = 1636 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1637 ret = -EINVAL; 1638 goto out; 1639 } 1640 1641 dest_tpg = tmp_tpg; 1642 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1643 " %s Port RTPI: %hu\n", 1644 dest_tpg->se_tpg_tfo->get_fabric_name(), 1645 dest_node_acl->initiatorname, dest_rtpi); 1646 1647 spin_lock(&dev->se_port_lock); 1648 break; 1649 } 1650 spin_unlock(&dev->se_port_lock); 1651 1652 if (!dest_tpg) { 1653 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1654 " dest_tpg\n"); 1655 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1656 ret = -EINVAL; 1657 goto out; 1658 } 1659 #if 0 1660 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1661 " tid_len: %d for %s + %s\n", 1662 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1663 tpdl, tid_len, i_str, iport_ptr); 1664 #endif 1665 if (tid_len > tpdl) { 1666 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1667 " %u for Transport ID: %s\n", tid_len, ptr); 1668 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1669 core_scsi3_tpg_undepend_item(dest_tpg); 1670 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1671 ret = -EINVAL; 1672 goto out; 1673 } 1674 /* 1675 * Locate the desintation struct se_dev_entry pointer for matching 1676 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1677 * Target Port. 1678 */ 1679 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1680 dest_rtpi); 1681 if (!dest_se_deve) { 1682 pr_err("Unable to locate %s dest_se_deve" 1683 " from destination RTPI: %hu\n", 1684 dest_tpg->se_tpg_tfo->get_fabric_name(), 1685 dest_rtpi); 1686 1687 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1688 core_scsi3_tpg_undepend_item(dest_tpg); 1689 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1690 ret = -EINVAL; 1691 goto out; 1692 } 1693 1694 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1695 if (ret < 0) { 1696 pr_err("core_scsi3_lunacl_depend_item()" 1697 " failed\n"); 1698 atomic_dec(&dest_se_deve->pr_ref_count); 1699 smp_mb__after_atomic_dec(); 1700 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1701 core_scsi3_tpg_undepend_item(dest_tpg); 1702 cmd->scsi_sense_reason = 1703 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1704 ret = -EINVAL; 1705 goto out; 1706 } 1707 #if 0 1708 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1709 " dest_se_deve mapped_lun: %u\n", 1710 dest_tpg->se_tpg_tfo->get_fabric_name(), 1711 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1712 #endif 1713 /* 1714 * Skip any TransportIDs that already have a registration for 1715 * this target port. 1716 */ 1717 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1718 iport_ptr); 1719 if (pr_reg_e) { 1720 core_scsi3_put_pr_reg(pr_reg_e); 1721 core_scsi3_lunacl_undepend_item(dest_se_deve); 1722 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1723 core_scsi3_tpg_undepend_item(dest_tpg); 1724 ptr += tid_len; 1725 tpdl -= tid_len; 1726 tid_len = 0; 1727 continue; 1728 } 1729 /* 1730 * Allocate a struct pr_transport_id_holder and setup 1731 * the dest_node_acl and dest_se_deve pointers for the 1732 * loop below. 1733 */ 1734 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1735 GFP_KERNEL); 1736 if (!tidh_new) { 1737 pr_err("Unable to allocate tidh_new\n"); 1738 core_scsi3_lunacl_undepend_item(dest_se_deve); 1739 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1740 core_scsi3_tpg_undepend_item(dest_tpg); 1741 cmd->scsi_sense_reason = 1742 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1743 ret = -ENOMEM; 1744 goto out; 1745 } 1746 INIT_LIST_HEAD(&tidh_new->dest_list); 1747 tidh_new->dest_tpg = dest_tpg; 1748 tidh_new->dest_node_acl = dest_node_acl; 1749 tidh_new->dest_se_deve = dest_se_deve; 1750 1751 /* 1752 * Allocate, but do NOT add the registration for the 1753 * TransportID referenced SCSI Initiator port. This 1754 * done because of the following from spc4r17 in section 1755 * 6.14.3 wrt SPEC_I_PT: 1756 * 1757 * "If a registration fails for any initiator port (e.g., if th 1758 * logical unit does not have enough resources available to 1759 * hold the registration information), no registrations shall be 1760 * made, and the command shall be terminated with 1761 * CHECK CONDITION status." 1762 * 1763 * That means we call __core_scsi3_alloc_registration() here, 1764 * and then call __core_scsi3_add_registration() in the 1765 * 2nd loop which will never fail. 1766 */ 1767 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1768 dest_node_acl, dest_se_deve, iport_ptr, 1769 sa_res_key, all_tg_pt, aptpl); 1770 if (!dest_pr_reg) { 1771 core_scsi3_lunacl_undepend_item(dest_se_deve); 1772 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1773 core_scsi3_tpg_undepend_item(dest_tpg); 1774 kfree(tidh_new); 1775 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1776 ret = -EINVAL; 1777 goto out; 1778 } 1779 tidh_new->dest_pr_reg = dest_pr_reg; 1780 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1781 1782 ptr += tid_len; 1783 tpdl -= tid_len; 1784 tid_len = 0; 1785 1786 } 1787 1788 transport_kunmap_first_data_page(cmd); 1789 1790 /* 1791 * Go ahead and create a registrations from tid_dest_list for the 1792 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1793 * and dest_se_deve. 1794 * 1795 * The SA Reservation Key from the PROUT is set for the 1796 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1797 * means that the TransportID Initiator port will be 1798 * registered on all of the target ports in the SCSI target device 1799 * ALL_TG_PT=0 means the registration will only be for the 1800 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1801 * was received. 1802 */ 1803 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1804 dest_tpg = tidh->dest_tpg; 1805 dest_node_acl = tidh->dest_node_acl; 1806 dest_se_deve = tidh->dest_se_deve; 1807 dest_pr_reg = tidh->dest_pr_reg; 1808 dest_local_nexus = tidh->dest_local_nexus; 1809 1810 list_del(&tidh->dest_list); 1811 kfree(tidh); 1812 1813 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1814 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1815 PR_REG_ISID_ID_LEN); 1816 1817 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1818 dest_pr_reg, 0, 0); 1819 1820 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1821 " registered Transport ID for Node: %s%s Mapped LUN:" 1822 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1823 dest_node_acl->initiatorname, (prf_isid) ? 1824 &i_buf[0] : "", dest_se_deve->mapped_lun); 1825 1826 if (dest_local_nexus) 1827 continue; 1828 1829 core_scsi3_lunacl_undepend_item(dest_se_deve); 1830 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1831 core_scsi3_tpg_undepend_item(dest_tpg); 1832 } 1833 1834 return 0; 1835 out: 1836 transport_kunmap_first_data_page(cmd); 1837 /* 1838 * For the failure case, release everything from tid_dest_list 1839 * including *dest_pr_reg and the configfs dependances.. 1840 */ 1841 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1842 dest_tpg = tidh->dest_tpg; 1843 dest_node_acl = tidh->dest_node_acl; 1844 dest_se_deve = tidh->dest_se_deve; 1845 dest_pr_reg = tidh->dest_pr_reg; 1846 dest_local_nexus = tidh->dest_local_nexus; 1847 1848 list_del(&tidh->dest_list); 1849 kfree(tidh); 1850 /* 1851 * Release any extra ALL_TG_PT=1 registrations for 1852 * the SPEC_I_PT=1 case. 1853 */ 1854 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1855 &dest_pr_reg->pr_reg_atp_list, 1856 pr_reg_atp_mem_list) { 1857 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1858 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1859 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1860 } 1861 1862 kfree(dest_pr_reg->pr_aptpl_buf); 1863 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1864 1865 if (dest_local_nexus) 1866 continue; 1867 1868 core_scsi3_lunacl_undepend_item(dest_se_deve); 1869 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1870 core_scsi3_tpg_undepend_item(dest_tpg); 1871 } 1872 return ret; 1873 } 1874 1875 /* 1876 * Called with struct se_device->dev_reservation_lock held 1877 */ 1878 static int __core_scsi3_update_aptpl_buf( 1879 struct se_device *dev, 1880 unsigned char *buf, 1881 u32 pr_aptpl_buf_len, 1882 int clear_aptpl_metadata) 1883 { 1884 struct se_lun *lun; 1885 struct se_portal_group *tpg; 1886 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1887 struct t10_pr_registration *pr_reg; 1888 unsigned char tmp[512], isid_buf[32]; 1889 ssize_t len = 0; 1890 int reg_count = 0; 1891 1892 memset(buf, 0, pr_aptpl_buf_len); 1893 /* 1894 * Called to clear metadata once APTPL has been deactivated. 1895 */ 1896 if (clear_aptpl_metadata) { 1897 snprintf(buf, pr_aptpl_buf_len, 1898 "No Registrations or Reservations\n"); 1899 return 0; 1900 } 1901 /* 1902 * Walk the registration list.. 1903 */ 1904 spin_lock(&su_dev->t10_pr.registration_lock); 1905 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1906 pr_reg_list) { 1907 1908 tmp[0] = '\0'; 1909 isid_buf[0] = '\0'; 1910 tpg = pr_reg->pr_reg_nacl->se_tpg; 1911 lun = pr_reg->pr_reg_tg_pt_lun; 1912 /* 1913 * Write out any ISID value to APTPL metadata that was included 1914 * in the original registration. 1915 */ 1916 if (pr_reg->isid_present_at_reg) 1917 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1918 pr_reg->pr_reg_isid); 1919 /* 1920 * Include special metadata if the pr_reg matches the 1921 * reservation holder. 1922 */ 1923 if (dev->dev_pr_res_holder == pr_reg) { 1924 snprintf(tmp, 512, "PR_REG_START: %d" 1925 "\ninitiator_fabric=%s\n" 1926 "initiator_node=%s\n%s" 1927 "sa_res_key=%llu\n" 1928 "res_holder=1\nres_type=%02x\n" 1929 "res_scope=%02x\nres_all_tg_pt=%d\n" 1930 "mapped_lun=%u\n", reg_count, 1931 tpg->se_tpg_tfo->get_fabric_name(), 1932 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1933 pr_reg->pr_res_key, pr_reg->pr_res_type, 1934 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1935 pr_reg->pr_res_mapped_lun); 1936 } else { 1937 snprintf(tmp, 512, "PR_REG_START: %d\n" 1938 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1939 "sa_res_key=%llu\nres_holder=0\n" 1940 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1941 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1942 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1943 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1944 pr_reg->pr_res_mapped_lun); 1945 } 1946 1947 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1948 pr_err("Unable to update renaming" 1949 " APTPL metadata\n"); 1950 spin_unlock(&su_dev->t10_pr.registration_lock); 1951 return -EMSGSIZE; 1952 } 1953 len += sprintf(buf+len, "%s", tmp); 1954 1955 /* 1956 * Include information about the associated SCSI target port. 1957 */ 1958 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1959 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1960 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1961 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1962 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1963 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1964 1965 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1966 pr_err("Unable to update renaming" 1967 " APTPL metadata\n"); 1968 spin_unlock(&su_dev->t10_pr.registration_lock); 1969 return -EMSGSIZE; 1970 } 1971 len += sprintf(buf+len, "%s", tmp); 1972 reg_count++; 1973 } 1974 spin_unlock(&su_dev->t10_pr.registration_lock); 1975 1976 if (!reg_count) 1977 len += sprintf(buf+len, "No Registrations or Reservations"); 1978 1979 return 0; 1980 } 1981 1982 static int core_scsi3_update_aptpl_buf( 1983 struct se_device *dev, 1984 unsigned char *buf, 1985 u32 pr_aptpl_buf_len, 1986 int clear_aptpl_metadata) 1987 { 1988 int ret; 1989 1990 spin_lock(&dev->dev_reservation_lock); 1991 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 1992 clear_aptpl_metadata); 1993 spin_unlock(&dev->dev_reservation_lock); 1994 1995 return ret; 1996 } 1997 1998 /* 1999 * Called with struct se_device->aptpl_file_mutex held 2000 */ 2001 static int __core_scsi3_write_aptpl_to_file( 2002 struct se_device *dev, 2003 unsigned char *buf, 2004 u32 pr_aptpl_buf_len) 2005 { 2006 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2007 struct file *file; 2008 struct iovec iov[1]; 2009 mm_segment_t old_fs; 2010 int flags = O_RDWR | O_CREAT | O_TRUNC; 2011 char path[512]; 2012 int ret; 2013 2014 memset(iov, 0, sizeof(struct iovec)); 2015 memset(path, 0, 512); 2016 2017 if (strlen(&wwn->unit_serial[0]) >= 512) { 2018 pr_err("WWN value for struct se_device does not fit" 2019 " into path buffer\n"); 2020 return -EMSGSIZE; 2021 } 2022 2023 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2024 file = filp_open(path, flags, 0600); 2025 if (IS_ERR(file) || !file || !file->f_dentry) { 2026 pr_err("filp_open(%s) for APTPL metadata" 2027 " failed\n", path); 2028 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT); 2029 } 2030 2031 iov[0].iov_base = &buf[0]; 2032 if (!pr_aptpl_buf_len) 2033 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2034 else 2035 iov[0].iov_len = pr_aptpl_buf_len; 2036 2037 old_fs = get_fs(); 2038 set_fs(get_ds()); 2039 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2040 set_fs(old_fs); 2041 2042 if (ret < 0) { 2043 pr_debug("Error writing APTPL metadata file: %s\n", path); 2044 filp_close(file, NULL); 2045 return -EIO; 2046 } 2047 filp_close(file, NULL); 2048 2049 return 0; 2050 } 2051 2052 static int core_scsi3_update_and_write_aptpl( 2053 struct se_device *dev, 2054 unsigned char *in_buf, 2055 u32 in_pr_aptpl_buf_len) 2056 { 2057 unsigned char null_buf[64], *buf; 2058 u32 pr_aptpl_buf_len; 2059 int ret, clear_aptpl_metadata = 0; 2060 /* 2061 * Can be called with a NULL pointer from PROUT service action CLEAR 2062 */ 2063 if (!in_buf) { 2064 memset(null_buf, 0, 64); 2065 buf = &null_buf[0]; 2066 /* 2067 * This will clear the APTPL metadata to: 2068 * "No Registrations or Reservations" status 2069 */ 2070 pr_aptpl_buf_len = 64; 2071 clear_aptpl_metadata = 1; 2072 } else { 2073 buf = in_buf; 2074 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2075 } 2076 2077 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2078 clear_aptpl_metadata); 2079 if (ret != 0) 2080 return ret; 2081 /* 2082 * __core_scsi3_write_aptpl_to_file() will call strlen() 2083 * on the passed buf to determine pr_aptpl_buf_len. 2084 */ 2085 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2086 if (ret != 0) 2087 return ret; 2088 2089 return ret; 2090 } 2091 2092 static int core_scsi3_emulate_pro_register( 2093 struct se_cmd *cmd, 2094 u64 res_key, 2095 u64 sa_res_key, 2096 int aptpl, 2097 int all_tg_pt, 2098 int spec_i_pt, 2099 int ignore_key) 2100 { 2101 struct se_session *se_sess = cmd->se_sess; 2102 struct se_device *dev = cmd->se_dev; 2103 struct se_dev_entry *se_deve; 2104 struct se_lun *se_lun = cmd->se_lun; 2105 struct se_portal_group *se_tpg; 2106 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2107 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2108 /* Used for APTPL metadata w/ UNREGISTER */ 2109 unsigned char *pr_aptpl_buf = NULL; 2110 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2111 int pr_holder = 0, ret = 0, type; 2112 2113 if (!se_sess || !se_lun) { 2114 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2115 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2116 return -EINVAL; 2117 } 2118 se_tpg = se_sess->se_tpg; 2119 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2120 2121 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2122 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2123 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2124 PR_REG_ISID_LEN); 2125 isid_ptr = &isid_buf[0]; 2126 } 2127 /* 2128 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2129 */ 2130 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2131 if (!pr_reg_e) { 2132 if (res_key) { 2133 pr_warn("SPC-3 PR: Reservation Key non-zero" 2134 " for SA REGISTER, returning CONFLICT\n"); 2135 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2136 return -EINVAL; 2137 } 2138 /* 2139 * Do nothing but return GOOD status. 2140 */ 2141 if (!sa_res_key) 2142 return 0; 2143 2144 if (!spec_i_pt) { 2145 /* 2146 * Perform the Service Action REGISTER on the Initiator 2147 * Port Endpoint that the PRO was received from on the 2148 * Logical Unit of the SCSI device server. 2149 */ 2150 ret = core_scsi3_alloc_registration(cmd->se_dev, 2151 se_sess->se_node_acl, se_deve, isid_ptr, 2152 sa_res_key, all_tg_pt, aptpl, 2153 ignore_key, 0); 2154 if (ret != 0) { 2155 pr_err("Unable to allocate" 2156 " struct t10_pr_registration\n"); 2157 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2158 return -EINVAL; 2159 } 2160 } else { 2161 /* 2162 * Register both the Initiator port that received 2163 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2164 * TransportID from Parameter list and loop through 2165 * fabric dependent parameter list while calling 2166 * logic from of core_scsi3_alloc_registration() for 2167 * each TransportID provided SCSI Initiator Port/Device 2168 */ 2169 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2170 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2171 if (ret != 0) 2172 return ret; 2173 } 2174 /* 2175 * Nothing left to do for the APTPL=0 case. 2176 */ 2177 if (!aptpl) { 2178 pr_tmpl->pr_aptpl_active = 0; 2179 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2180 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2181 " REGISTER\n"); 2182 return 0; 2183 } 2184 /* 2185 * Locate the newly allocated local I_T Nexus *pr_reg, and 2186 * update the APTPL metadata information using its 2187 * preallocated *pr_reg->pr_aptpl_buf. 2188 */ 2189 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2190 se_sess->se_node_acl, se_sess); 2191 2192 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2193 &pr_reg->pr_aptpl_buf[0], 2194 pr_tmpl->pr_aptpl_buf_len); 2195 if (!ret) { 2196 pr_tmpl->pr_aptpl_active = 1; 2197 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2198 } 2199 2200 core_scsi3_put_pr_reg(pr_reg); 2201 return ret; 2202 } else { 2203 /* 2204 * Locate the existing *pr_reg via struct se_node_acl pointers 2205 */ 2206 pr_reg = pr_reg_e; 2207 type = pr_reg->pr_res_type; 2208 2209 if (!ignore_key) { 2210 if (res_key != pr_reg->pr_res_key) { 2211 pr_err("SPC-3 PR REGISTER: Received" 2212 " res_key: 0x%016Lx does not match" 2213 " existing SA REGISTER res_key:" 2214 " 0x%016Lx\n", res_key, 2215 pr_reg->pr_res_key); 2216 core_scsi3_put_pr_reg(pr_reg); 2217 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2218 return -EINVAL; 2219 } 2220 } 2221 if (spec_i_pt) { 2222 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2223 " set while sa_res_key=0\n"); 2224 core_scsi3_put_pr_reg(pr_reg); 2225 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2226 return -EINVAL; 2227 } 2228 /* 2229 * An existing ALL_TG_PT=1 registration being released 2230 * must also set ALL_TG_PT=1 in the incoming PROUT. 2231 */ 2232 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2233 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2234 " registration exists, but ALL_TG_PT=1 bit not" 2235 " present in received PROUT\n"); 2236 core_scsi3_put_pr_reg(pr_reg); 2237 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2238 return -EINVAL; 2239 } 2240 /* 2241 * Allocate APTPL metadata buffer used for UNREGISTER ops 2242 */ 2243 if (aptpl) { 2244 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2245 GFP_KERNEL); 2246 if (!pr_aptpl_buf) { 2247 pr_err("Unable to allocate" 2248 " pr_aptpl_buf\n"); 2249 core_scsi3_put_pr_reg(pr_reg); 2250 cmd->scsi_sense_reason = 2251 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2252 return -EINVAL; 2253 } 2254 } 2255 /* 2256 * sa_res_key=0 Unregister Reservation Key for registered I_T 2257 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2258 * Nexus. 2259 */ 2260 if (!sa_res_key) { 2261 pr_holder = core_scsi3_check_implict_release( 2262 cmd->se_dev, pr_reg); 2263 if (pr_holder < 0) { 2264 kfree(pr_aptpl_buf); 2265 core_scsi3_put_pr_reg(pr_reg); 2266 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2267 return -EINVAL; 2268 } 2269 2270 spin_lock(&pr_tmpl->registration_lock); 2271 /* 2272 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2273 * and matching pr_res_key. 2274 */ 2275 if (pr_reg->pr_reg_all_tg_pt) { 2276 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2277 &pr_tmpl->registration_list, 2278 pr_reg_list) { 2279 2280 if (!pr_reg_p->pr_reg_all_tg_pt) 2281 continue; 2282 2283 if (pr_reg_p->pr_res_key != res_key) 2284 continue; 2285 2286 if (pr_reg == pr_reg_p) 2287 continue; 2288 2289 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2290 pr_reg_p->pr_reg_nacl->initiatorname)) 2291 continue; 2292 2293 __core_scsi3_free_registration(dev, 2294 pr_reg_p, NULL, 0); 2295 } 2296 } 2297 /* 2298 * Release the calling I_T Nexus registration now.. 2299 */ 2300 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2301 NULL, 1); 2302 /* 2303 * From spc4r17, section 5.7.11.3 Unregistering 2304 * 2305 * If the persistent reservation is a registrants only 2306 * type, the device server shall establish a unit 2307 * attention condition for the initiator port associated 2308 * with every registered I_T nexus except for the I_T 2309 * nexus on which the PERSISTENT RESERVE OUT command was 2310 * received, with the additional sense code set to 2311 * RESERVATIONS RELEASED. 2312 */ 2313 if (pr_holder && 2314 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2315 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2316 list_for_each_entry(pr_reg_p, 2317 &pr_tmpl->registration_list, 2318 pr_reg_list) { 2319 2320 core_scsi3_ua_allocate( 2321 pr_reg_p->pr_reg_nacl, 2322 pr_reg_p->pr_res_mapped_lun, 2323 0x2A, 2324 ASCQ_2AH_RESERVATIONS_RELEASED); 2325 } 2326 } 2327 spin_unlock(&pr_tmpl->registration_lock); 2328 2329 if (!aptpl) { 2330 pr_tmpl->pr_aptpl_active = 0; 2331 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2332 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2333 " for UNREGISTER\n"); 2334 return 0; 2335 } 2336 2337 ret = core_scsi3_update_and_write_aptpl(dev, 2338 &pr_aptpl_buf[0], 2339 pr_tmpl->pr_aptpl_buf_len); 2340 if (!ret) { 2341 pr_tmpl->pr_aptpl_active = 1; 2342 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2343 " for UNREGISTER\n"); 2344 } 2345 2346 kfree(pr_aptpl_buf); 2347 return ret; 2348 } else { 2349 /* 2350 * Increment PRgeneration counter for struct se_device" 2351 * upon a successful REGISTER, see spc4r17 section 6.3.2 2352 * READ_KEYS service action. 2353 */ 2354 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2355 cmd->se_dev); 2356 pr_reg->pr_res_key = sa_res_key; 2357 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2358 " Key for %s to: 0x%016Lx PRgeneration:" 2359 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2360 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2361 pr_reg->pr_reg_nacl->initiatorname, 2362 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2363 2364 if (!aptpl) { 2365 pr_tmpl->pr_aptpl_active = 0; 2366 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2367 core_scsi3_put_pr_reg(pr_reg); 2368 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2369 " for REGISTER\n"); 2370 return 0; 2371 } 2372 2373 ret = core_scsi3_update_and_write_aptpl(dev, 2374 &pr_aptpl_buf[0], 2375 pr_tmpl->pr_aptpl_buf_len); 2376 if (!ret) { 2377 pr_tmpl->pr_aptpl_active = 1; 2378 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2379 " for REGISTER\n"); 2380 } 2381 2382 kfree(pr_aptpl_buf); 2383 core_scsi3_put_pr_reg(pr_reg); 2384 } 2385 } 2386 return 0; 2387 } 2388 2389 unsigned char *core_scsi3_pr_dump_type(int type) 2390 { 2391 switch (type) { 2392 case PR_TYPE_WRITE_EXCLUSIVE: 2393 return "Write Exclusive Access"; 2394 case PR_TYPE_EXCLUSIVE_ACCESS: 2395 return "Exclusive Access"; 2396 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2397 return "Write Exclusive Access, Registrants Only"; 2398 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2399 return "Exclusive Access, Registrants Only"; 2400 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2401 return "Write Exclusive Access, All Registrants"; 2402 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2403 return "Exclusive Access, All Registrants"; 2404 default: 2405 break; 2406 } 2407 2408 return "Unknown SPC-3 PR Type"; 2409 } 2410 2411 static int core_scsi3_pro_reserve( 2412 struct se_cmd *cmd, 2413 struct se_device *dev, 2414 int type, 2415 int scope, 2416 u64 res_key) 2417 { 2418 struct se_session *se_sess = cmd->se_sess; 2419 struct se_dev_entry *se_deve; 2420 struct se_lun *se_lun = cmd->se_lun; 2421 struct se_portal_group *se_tpg; 2422 struct t10_pr_registration *pr_reg, *pr_res_holder; 2423 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2424 char i_buf[PR_REG_ISID_ID_LEN]; 2425 int ret, prf_isid; 2426 2427 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2428 2429 if (!se_sess || !se_lun) { 2430 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2431 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2432 return -EINVAL; 2433 } 2434 se_tpg = se_sess->se_tpg; 2435 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2436 /* 2437 * Locate the existing *pr_reg via struct se_node_acl pointers 2438 */ 2439 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2440 se_sess); 2441 if (!pr_reg) { 2442 pr_err("SPC-3 PR: Unable to locate" 2443 " PR_REGISTERED *pr_reg for RESERVE\n"); 2444 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2445 return -EINVAL; 2446 } 2447 /* 2448 * From spc4r17 Section 5.7.9: Reserving: 2449 * 2450 * An application client creates a persistent reservation by issuing 2451 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2452 * a registered I_T nexus with the following parameters: 2453 * a) RESERVATION KEY set to the value of the reservation key that is 2454 * registered with the logical unit for the I_T nexus; and 2455 */ 2456 if (res_key != pr_reg->pr_res_key) { 2457 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2458 " does not match existing SA REGISTER res_key:" 2459 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2460 core_scsi3_put_pr_reg(pr_reg); 2461 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2462 return -EINVAL; 2463 } 2464 /* 2465 * From spc4r17 Section 5.7.9: Reserving: 2466 * 2467 * From above: 2468 * b) TYPE field and SCOPE field set to the persistent reservation 2469 * being created. 2470 * 2471 * Only one persistent reservation is allowed at a time per logical unit 2472 * and that persistent reservation has a scope of LU_SCOPE. 2473 */ 2474 if (scope != PR_SCOPE_LU_SCOPE) { 2475 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2476 core_scsi3_put_pr_reg(pr_reg); 2477 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2478 return -EINVAL; 2479 } 2480 /* 2481 * See if we have an existing PR reservation holder pointer at 2482 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2483 * *pr_res_holder. 2484 */ 2485 spin_lock(&dev->dev_reservation_lock); 2486 pr_res_holder = dev->dev_pr_res_holder; 2487 if ((pr_res_holder)) { 2488 /* 2489 * From spc4r17 Section 5.7.9: Reserving: 2490 * 2491 * If the device server receives a PERSISTENT RESERVE OUT 2492 * command from an I_T nexus other than a persistent reservation 2493 * holder (see 5.7.10) that attempts to create a persistent 2494 * reservation when a persistent reservation already exists for 2495 * the logical unit, then the command shall be completed with 2496 * RESERVATION CONFLICT status. 2497 */ 2498 if (pr_res_holder != pr_reg) { 2499 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2500 pr_err("SPC-3 PR: Attempted RESERVE from" 2501 " [%s]: %s while reservation already held by" 2502 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2503 cmd->se_tfo->get_fabric_name(), 2504 se_sess->se_node_acl->initiatorname, 2505 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2506 pr_res_holder->pr_reg_nacl->initiatorname); 2507 2508 spin_unlock(&dev->dev_reservation_lock); 2509 core_scsi3_put_pr_reg(pr_reg); 2510 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2511 return -EINVAL; 2512 } 2513 /* 2514 * From spc4r17 Section 5.7.9: Reserving: 2515 * 2516 * If a persistent reservation holder attempts to modify the 2517 * type or scope of an existing persistent reservation, the 2518 * command shall be completed with RESERVATION CONFLICT status. 2519 */ 2520 if ((pr_res_holder->pr_res_type != type) || 2521 (pr_res_holder->pr_res_scope != scope)) { 2522 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2523 pr_err("SPC-3 PR: Attempted RESERVE from" 2524 " [%s]: %s trying to change TYPE and/or SCOPE," 2525 " while reservation already held by [%s]: %s," 2526 " returning RESERVATION_CONFLICT\n", 2527 cmd->se_tfo->get_fabric_name(), 2528 se_sess->se_node_acl->initiatorname, 2529 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2530 pr_res_holder->pr_reg_nacl->initiatorname); 2531 2532 spin_unlock(&dev->dev_reservation_lock); 2533 core_scsi3_put_pr_reg(pr_reg); 2534 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2535 return -EINVAL; 2536 } 2537 /* 2538 * From spc4r17 Section 5.7.9: Reserving: 2539 * 2540 * If the device server receives a PERSISTENT RESERVE OUT 2541 * command with RESERVE service action where the TYPE field and 2542 * the SCOPE field contain the same values as the existing type 2543 * and scope from a persistent reservation holder, it shall not 2544 * make any change to the existing persistent reservation and 2545 * shall completethe command with GOOD status. 2546 */ 2547 spin_unlock(&dev->dev_reservation_lock); 2548 core_scsi3_put_pr_reg(pr_reg); 2549 return 0; 2550 } 2551 /* 2552 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2553 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2554 */ 2555 pr_reg->pr_res_scope = scope; 2556 pr_reg->pr_res_type = type; 2557 pr_reg->pr_res_holder = 1; 2558 dev->dev_pr_res_holder = pr_reg; 2559 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2560 PR_REG_ISID_ID_LEN); 2561 2562 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2563 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2564 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2565 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2566 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2567 cmd->se_tfo->get_fabric_name(), 2568 se_sess->se_node_acl->initiatorname, 2569 (prf_isid) ? &i_buf[0] : ""); 2570 spin_unlock(&dev->dev_reservation_lock); 2571 2572 if (pr_tmpl->pr_aptpl_active) { 2573 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2574 &pr_reg->pr_aptpl_buf[0], 2575 pr_tmpl->pr_aptpl_buf_len); 2576 if (!ret) 2577 pr_debug("SPC-3 PR: Updated APTPL metadata" 2578 " for RESERVE\n"); 2579 } 2580 2581 core_scsi3_put_pr_reg(pr_reg); 2582 return 0; 2583 } 2584 2585 static int core_scsi3_emulate_pro_reserve( 2586 struct se_cmd *cmd, 2587 int type, 2588 int scope, 2589 u64 res_key) 2590 { 2591 struct se_device *dev = cmd->se_dev; 2592 int ret = 0; 2593 2594 switch (type) { 2595 case PR_TYPE_WRITE_EXCLUSIVE: 2596 case PR_TYPE_EXCLUSIVE_ACCESS: 2597 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2598 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2599 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2600 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2601 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2602 break; 2603 default: 2604 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2605 " 0x%02x\n", type); 2606 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2607 return -EINVAL; 2608 } 2609 2610 return ret; 2611 } 2612 2613 /* 2614 * Called with struct se_device->dev_reservation_lock held. 2615 */ 2616 static void __core_scsi3_complete_pro_release( 2617 struct se_device *dev, 2618 struct se_node_acl *se_nacl, 2619 struct t10_pr_registration *pr_reg, 2620 int explict) 2621 { 2622 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2623 char i_buf[PR_REG_ISID_ID_LEN]; 2624 int prf_isid; 2625 2626 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2627 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2628 PR_REG_ISID_ID_LEN); 2629 /* 2630 * Go ahead and release the current PR reservation holder. 2631 */ 2632 dev->dev_pr_res_holder = NULL; 2633 2634 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2635 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2636 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2637 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2638 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2639 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2640 tfo->get_fabric_name(), se_nacl->initiatorname, 2641 (prf_isid) ? &i_buf[0] : ""); 2642 /* 2643 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2644 */ 2645 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2646 } 2647 2648 static int core_scsi3_emulate_pro_release( 2649 struct se_cmd *cmd, 2650 int type, 2651 int scope, 2652 u64 res_key) 2653 { 2654 struct se_device *dev = cmd->se_dev; 2655 struct se_session *se_sess = cmd->se_sess; 2656 struct se_lun *se_lun = cmd->se_lun; 2657 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2658 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2659 int ret, all_reg = 0; 2660 2661 if (!se_sess || !se_lun) { 2662 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2663 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2664 return -EINVAL; 2665 } 2666 /* 2667 * Locate the existing *pr_reg via struct se_node_acl pointers 2668 */ 2669 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2670 if (!pr_reg) { 2671 pr_err("SPC-3 PR: Unable to locate" 2672 " PR_REGISTERED *pr_reg for RELEASE\n"); 2673 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2674 return -EINVAL; 2675 } 2676 /* 2677 * From spc4r17 Section 5.7.11.2 Releasing: 2678 * 2679 * If there is no persistent reservation or in response to a persistent 2680 * reservation release request from a registered I_T nexus that is not a 2681 * persistent reservation holder (see 5.7.10), the device server shall 2682 * do the following: 2683 * 2684 * a) Not release the persistent reservation, if any; 2685 * b) Not remove any registrations; and 2686 * c) Complete the command with GOOD status. 2687 */ 2688 spin_lock(&dev->dev_reservation_lock); 2689 pr_res_holder = dev->dev_pr_res_holder; 2690 if (!pr_res_holder) { 2691 /* 2692 * No persistent reservation, return GOOD status. 2693 */ 2694 spin_unlock(&dev->dev_reservation_lock); 2695 core_scsi3_put_pr_reg(pr_reg); 2696 return 0; 2697 } 2698 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2699 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2700 all_reg = 1; 2701 2702 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2703 /* 2704 * Non 'All Registrants' PR Type cases.. 2705 * Release request from a registered I_T nexus that is not a 2706 * persistent reservation holder. return GOOD status. 2707 */ 2708 spin_unlock(&dev->dev_reservation_lock); 2709 core_scsi3_put_pr_reg(pr_reg); 2710 return 0; 2711 } 2712 /* 2713 * From spc4r17 Section 5.7.11.2 Releasing: 2714 * 2715 * Only the persistent reservation holder (see 5.7.10) is allowed to 2716 * release a persistent reservation. 2717 * 2718 * An application client releases the persistent reservation by issuing 2719 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2720 * an I_T nexus that is a persistent reservation holder with the 2721 * following parameters: 2722 * 2723 * a) RESERVATION KEY field set to the value of the reservation key 2724 * that is registered with the logical unit for the I_T nexus; 2725 */ 2726 if (res_key != pr_reg->pr_res_key) { 2727 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2728 " does not match existing SA REGISTER res_key:" 2729 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2730 spin_unlock(&dev->dev_reservation_lock); 2731 core_scsi3_put_pr_reg(pr_reg); 2732 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2733 return -EINVAL; 2734 } 2735 /* 2736 * From spc4r17 Section 5.7.11.2 Releasing and above: 2737 * 2738 * b) TYPE field and SCOPE field set to match the persistent 2739 * reservation being released. 2740 */ 2741 if ((pr_res_holder->pr_res_type != type) || 2742 (pr_res_holder->pr_res_scope != scope)) { 2743 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2744 pr_err("SPC-3 PR RELEASE: Attempted to release" 2745 " reservation from [%s]: %s with different TYPE " 2746 "and/or SCOPE while reservation already held by" 2747 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2748 cmd->se_tfo->get_fabric_name(), 2749 se_sess->se_node_acl->initiatorname, 2750 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2751 pr_res_holder->pr_reg_nacl->initiatorname); 2752 2753 spin_unlock(&dev->dev_reservation_lock); 2754 core_scsi3_put_pr_reg(pr_reg); 2755 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2756 return -EINVAL; 2757 } 2758 /* 2759 * In response to a persistent reservation release request from the 2760 * persistent reservation holder the device server shall perform a 2761 * release by doing the following as an uninterrupted series of actions: 2762 * a) Release the persistent reservation; 2763 * b) Not remove any registration(s); 2764 * c) If the released persistent reservation is a registrants only type 2765 * or all registrants type persistent reservation, 2766 * the device server shall establish a unit attention condition for 2767 * the initiator port associated with every regis- 2768 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2769 * RESERVE OUT command with RELEASE service action was received, 2770 * with the additional sense code set to RESERVATIONS RELEASED; and 2771 * d) If the persistent reservation is of any other type, the device 2772 * server shall not establish a unit attention condition. 2773 */ 2774 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2775 pr_reg, 1); 2776 2777 spin_unlock(&dev->dev_reservation_lock); 2778 2779 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2780 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2781 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2782 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2783 /* 2784 * If no UNIT ATTENTION conditions will be established for 2785 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2786 * go ahead and check for APTPL=1 update+write below 2787 */ 2788 goto write_aptpl; 2789 } 2790 2791 spin_lock(&pr_tmpl->registration_lock); 2792 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2793 pr_reg_list) { 2794 /* 2795 * Do not establish a UNIT ATTENTION condition 2796 * for the calling I_T Nexus 2797 */ 2798 if (pr_reg_p == pr_reg) 2799 continue; 2800 2801 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2802 pr_reg_p->pr_res_mapped_lun, 2803 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2804 } 2805 spin_unlock(&pr_tmpl->registration_lock); 2806 2807 write_aptpl: 2808 if (pr_tmpl->pr_aptpl_active) { 2809 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2810 &pr_reg->pr_aptpl_buf[0], 2811 pr_tmpl->pr_aptpl_buf_len); 2812 if (!ret) 2813 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2814 } 2815 2816 core_scsi3_put_pr_reg(pr_reg); 2817 return 0; 2818 } 2819 2820 static int core_scsi3_emulate_pro_clear( 2821 struct se_cmd *cmd, 2822 u64 res_key) 2823 { 2824 struct se_device *dev = cmd->se_dev; 2825 struct se_node_acl *pr_reg_nacl; 2826 struct se_session *se_sess = cmd->se_sess; 2827 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2828 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2829 u32 pr_res_mapped_lun = 0; 2830 int calling_it_nexus = 0; 2831 /* 2832 * Locate the existing *pr_reg via struct se_node_acl pointers 2833 */ 2834 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2835 se_sess->se_node_acl, se_sess); 2836 if (!pr_reg_n) { 2837 pr_err("SPC-3 PR: Unable to locate" 2838 " PR_REGISTERED *pr_reg for CLEAR\n"); 2839 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2840 return -EINVAL; 2841 } 2842 /* 2843 * From spc4r17 section 5.7.11.6, Clearing: 2844 * 2845 * Any application client may release the persistent reservation and 2846 * remove all registrations from a device server by issuing a 2847 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2848 * registered I_T nexus with the following parameter: 2849 * 2850 * a) RESERVATION KEY field set to the value of the reservation key 2851 * that is registered with the logical unit for the I_T nexus. 2852 */ 2853 if (res_key != pr_reg_n->pr_res_key) { 2854 pr_err("SPC-3 PR REGISTER: Received" 2855 " res_key: 0x%016Lx does not match" 2856 " existing SA REGISTER res_key:" 2857 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2858 core_scsi3_put_pr_reg(pr_reg_n); 2859 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2860 return -EINVAL; 2861 } 2862 /* 2863 * a) Release the persistent reservation, if any; 2864 */ 2865 spin_lock(&dev->dev_reservation_lock); 2866 pr_res_holder = dev->dev_pr_res_holder; 2867 if (pr_res_holder) { 2868 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2869 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2870 pr_res_holder, 0); 2871 } 2872 spin_unlock(&dev->dev_reservation_lock); 2873 /* 2874 * b) Remove all registration(s) (see spc4r17 5.7.7); 2875 */ 2876 spin_lock(&pr_tmpl->registration_lock); 2877 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2878 &pr_tmpl->registration_list, pr_reg_list) { 2879 2880 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2881 pr_reg_nacl = pr_reg->pr_reg_nacl; 2882 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2883 __core_scsi3_free_registration(dev, pr_reg, NULL, 2884 calling_it_nexus); 2885 /* 2886 * e) Establish a unit attention condition for the initiator 2887 * port associated with every registered I_T nexus other 2888 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2889 * command with CLEAR service action was received, with the 2890 * additional sense code set to RESERVATIONS PREEMPTED. 2891 */ 2892 if (!calling_it_nexus) 2893 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2894 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2895 } 2896 spin_unlock(&pr_tmpl->registration_lock); 2897 2898 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2899 cmd->se_tfo->get_fabric_name()); 2900 2901 if (pr_tmpl->pr_aptpl_active) { 2902 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2903 pr_debug("SPC-3 PR: Updated APTPL metadata" 2904 " for CLEAR\n"); 2905 } 2906 2907 core_scsi3_pr_generation(dev); 2908 return 0; 2909 } 2910 2911 /* 2912 * Called with struct se_device->dev_reservation_lock held. 2913 */ 2914 static void __core_scsi3_complete_pro_preempt( 2915 struct se_device *dev, 2916 struct t10_pr_registration *pr_reg, 2917 struct list_head *preempt_and_abort_list, 2918 int type, 2919 int scope, 2920 int abort) 2921 { 2922 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2923 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2924 char i_buf[PR_REG_ISID_ID_LEN]; 2925 int prf_isid; 2926 2927 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2928 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2929 PR_REG_ISID_ID_LEN); 2930 /* 2931 * Do an implict RELEASE of the existing reservation. 2932 */ 2933 if (dev->dev_pr_res_holder) 2934 __core_scsi3_complete_pro_release(dev, nacl, 2935 dev->dev_pr_res_holder, 0); 2936 2937 dev->dev_pr_res_holder = pr_reg; 2938 pr_reg->pr_res_holder = 1; 2939 pr_reg->pr_res_type = type; 2940 pr_reg->pr_res_scope = scope; 2941 2942 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2943 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2944 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2945 core_scsi3_pr_dump_type(type), 2946 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2947 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2948 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2949 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2950 /* 2951 * For PREEMPT_AND_ABORT, add the preempting reservation's 2952 * struct t10_pr_registration to the list that will be compared 2953 * against received CDBs.. 2954 */ 2955 if (preempt_and_abort_list) 2956 list_add_tail(&pr_reg->pr_reg_abort_list, 2957 preempt_and_abort_list); 2958 } 2959 2960 static void core_scsi3_release_preempt_and_abort( 2961 struct list_head *preempt_and_abort_list, 2962 struct t10_pr_registration *pr_reg_holder) 2963 { 2964 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2965 2966 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2967 pr_reg_abort_list) { 2968 2969 list_del(&pr_reg->pr_reg_abort_list); 2970 if (pr_reg_holder == pr_reg) 2971 continue; 2972 if (pr_reg->pr_res_holder) { 2973 pr_warn("pr_reg->pr_res_holder still set\n"); 2974 continue; 2975 } 2976 2977 pr_reg->pr_reg_deve = NULL; 2978 pr_reg->pr_reg_nacl = NULL; 2979 kfree(pr_reg->pr_aptpl_buf); 2980 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2981 } 2982 } 2983 2984 static int core_scsi3_pro_preempt( 2985 struct se_cmd *cmd, 2986 int type, 2987 int scope, 2988 u64 res_key, 2989 u64 sa_res_key, 2990 int abort) 2991 { 2992 struct se_device *dev = cmd->se_dev; 2993 struct se_dev_entry *se_deve; 2994 struct se_node_acl *pr_reg_nacl; 2995 struct se_session *se_sess = cmd->se_sess; 2996 struct list_head preempt_and_abort_list; 2997 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2998 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2999 u32 pr_res_mapped_lun = 0; 3000 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3001 int prh_type = 0, prh_scope = 0, ret; 3002 3003 if (!se_sess) { 3004 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3005 return -EINVAL; 3006 } 3007 3008 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3009 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3010 se_sess); 3011 if (!pr_reg_n) { 3012 pr_err("SPC-3 PR: Unable to locate" 3013 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3014 (abort) ? "_AND_ABORT" : ""); 3015 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3016 return -EINVAL; 3017 } 3018 if (pr_reg_n->pr_res_key != res_key) { 3019 core_scsi3_put_pr_reg(pr_reg_n); 3020 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3021 return -EINVAL; 3022 } 3023 if (scope != PR_SCOPE_LU_SCOPE) { 3024 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3025 core_scsi3_put_pr_reg(pr_reg_n); 3026 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3027 return -EINVAL; 3028 } 3029 INIT_LIST_HEAD(&preempt_and_abort_list); 3030 3031 spin_lock(&dev->dev_reservation_lock); 3032 pr_res_holder = dev->dev_pr_res_holder; 3033 if (pr_res_holder && 3034 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3035 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3036 all_reg = 1; 3037 3038 if (!all_reg && !sa_res_key) { 3039 spin_unlock(&dev->dev_reservation_lock); 3040 core_scsi3_put_pr_reg(pr_reg_n); 3041 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3042 return -EINVAL; 3043 } 3044 /* 3045 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3046 * 3047 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3048 * persistent reservation holder or there is no persistent reservation 3049 * holder (i.e., there is no persistent reservation), then the device 3050 * server shall perform a preempt by doing the following in an 3051 * uninterrupted series of actions. (See below..) 3052 */ 3053 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3054 /* 3055 * No existing or SA Reservation Key matching reservations.. 3056 * 3057 * PROUT SA PREEMPT with All Registrant type reservations are 3058 * allowed to be processed without a matching SA Reservation Key 3059 */ 3060 spin_lock(&pr_tmpl->registration_lock); 3061 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3062 &pr_tmpl->registration_list, pr_reg_list) { 3063 /* 3064 * Removing of registrations in non all registrants 3065 * type reservations without a matching SA reservation 3066 * key. 3067 * 3068 * a) Remove the registrations for all I_T nexuses 3069 * specified by the SERVICE ACTION RESERVATION KEY 3070 * field; 3071 * b) Ignore the contents of the SCOPE and TYPE fields; 3072 * c) Process tasks as defined in 5.7.1; and 3073 * d) Establish a unit attention condition for the 3074 * initiator port associated with every I_T nexus 3075 * that lost its registration other than the I_T 3076 * nexus on which the PERSISTENT RESERVE OUT command 3077 * was received, with the additional sense code set 3078 * to REGISTRATIONS PREEMPTED. 3079 */ 3080 if (!all_reg) { 3081 if (pr_reg->pr_res_key != sa_res_key) 3082 continue; 3083 3084 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3085 pr_reg_nacl = pr_reg->pr_reg_nacl; 3086 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3087 __core_scsi3_free_registration(dev, pr_reg, 3088 (abort) ? &preempt_and_abort_list : 3089 NULL, calling_it_nexus); 3090 released_regs++; 3091 } else { 3092 /* 3093 * Case for any existing all registrants type 3094 * reservation, follow logic in spc4r17 section 3095 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3096 * 3097 * For a ZERO SA Reservation key, release 3098 * all other registrations and do an implict 3099 * release of active persistent reservation. 3100 * 3101 * For a non-ZERO SA Reservation key, only 3102 * release the matching reservation key from 3103 * registrations. 3104 */ 3105 if ((sa_res_key) && 3106 (pr_reg->pr_res_key != sa_res_key)) 3107 continue; 3108 3109 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3110 if (calling_it_nexus) 3111 continue; 3112 3113 pr_reg_nacl = pr_reg->pr_reg_nacl; 3114 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3115 __core_scsi3_free_registration(dev, pr_reg, 3116 (abort) ? &preempt_and_abort_list : 3117 NULL, 0); 3118 released_regs++; 3119 } 3120 if (!calling_it_nexus) 3121 core_scsi3_ua_allocate(pr_reg_nacl, 3122 pr_res_mapped_lun, 0x2A, 3123 ASCQ_2AH_RESERVATIONS_PREEMPTED); 3124 } 3125 spin_unlock(&pr_tmpl->registration_lock); 3126 /* 3127 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3128 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3129 * RESERVATION KEY field to a value that does not match any 3130 * registered reservation key, then the device server shall 3131 * complete the command with RESERVATION CONFLICT status. 3132 */ 3133 if (!released_regs) { 3134 spin_unlock(&dev->dev_reservation_lock); 3135 core_scsi3_put_pr_reg(pr_reg_n); 3136 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3137 return -EINVAL; 3138 } 3139 /* 3140 * For an existing all registrants type reservation 3141 * with a zero SA rservation key, preempt the existing 3142 * reservation with the new PR type and scope. 3143 */ 3144 if (pr_res_holder && all_reg && !(sa_res_key)) { 3145 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3146 (abort) ? &preempt_and_abort_list : NULL, 3147 type, scope, abort); 3148 3149 if (abort) 3150 core_scsi3_release_preempt_and_abort( 3151 &preempt_and_abort_list, pr_reg_n); 3152 } 3153 spin_unlock(&dev->dev_reservation_lock); 3154 3155 if (pr_tmpl->pr_aptpl_active) { 3156 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3157 &pr_reg_n->pr_aptpl_buf[0], 3158 pr_tmpl->pr_aptpl_buf_len); 3159 if (!ret) 3160 pr_debug("SPC-3 PR: Updated APTPL" 3161 " metadata for PREEMPT%s\n", (abort) ? 3162 "_AND_ABORT" : ""); 3163 } 3164 3165 core_scsi3_put_pr_reg(pr_reg_n); 3166 core_scsi3_pr_generation(cmd->se_dev); 3167 return 0; 3168 } 3169 /* 3170 * The PREEMPTing SA reservation key matches that of the 3171 * existing persistent reservation, first, we check if 3172 * we are preempting our own reservation. 3173 * From spc4r17, section 5.7.11.4.3 Preempting 3174 * persistent reservations and registration handling 3175 * 3176 * If an all registrants persistent reservation is not 3177 * present, it is not an error for the persistent 3178 * reservation holder to preempt itself (i.e., a 3179 * PERSISTENT RESERVE OUT with a PREEMPT service action 3180 * or a PREEMPT AND ABORT service action with the 3181 * SERVICE ACTION RESERVATION KEY value equal to the 3182 * persistent reservation holder's reservation key that 3183 * is received from the persistent reservation holder). 3184 * In that case, the device server shall establish the 3185 * new persistent reservation and maintain the 3186 * registration. 3187 */ 3188 prh_type = pr_res_holder->pr_res_type; 3189 prh_scope = pr_res_holder->pr_res_scope; 3190 /* 3191 * If the SERVICE ACTION RESERVATION KEY field identifies a 3192 * persistent reservation holder (see 5.7.10), the device 3193 * server shall perform a preempt by doing the following as 3194 * an uninterrupted series of actions: 3195 * 3196 * a) Release the persistent reservation for the holder 3197 * identified by the SERVICE ACTION RESERVATION KEY field; 3198 */ 3199 if (pr_reg_n != pr_res_holder) 3200 __core_scsi3_complete_pro_release(dev, 3201 pr_res_holder->pr_reg_nacl, 3202 dev->dev_pr_res_holder, 0); 3203 /* 3204 * b) Remove the registrations for all I_T nexuses identified 3205 * by the SERVICE ACTION RESERVATION KEY field, except the 3206 * I_T nexus that is being used for the PERSISTENT RESERVE 3207 * OUT command. If an all registrants persistent reservation 3208 * is present and the SERVICE ACTION RESERVATION KEY field 3209 * is set to zero, then all registrations shall be removed 3210 * except for that of the I_T nexus that is being used for 3211 * the PERSISTENT RESERVE OUT command; 3212 */ 3213 spin_lock(&pr_tmpl->registration_lock); 3214 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3215 &pr_tmpl->registration_list, pr_reg_list) { 3216 3217 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3218 if (calling_it_nexus) 3219 continue; 3220 3221 if (pr_reg->pr_res_key != sa_res_key) 3222 continue; 3223 3224 pr_reg_nacl = pr_reg->pr_reg_nacl; 3225 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3226 __core_scsi3_free_registration(dev, pr_reg, 3227 (abort) ? &preempt_and_abort_list : NULL, 3228 calling_it_nexus); 3229 /* 3230 * e) Establish a unit attention condition for the initiator 3231 * port associated with every I_T nexus that lost its 3232 * persistent reservation and/or registration, with the 3233 * additional sense code set to REGISTRATIONS PREEMPTED; 3234 */ 3235 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3236 ASCQ_2AH_RESERVATIONS_PREEMPTED); 3237 } 3238 spin_unlock(&pr_tmpl->registration_lock); 3239 /* 3240 * c) Establish a persistent reservation for the preempting 3241 * I_T nexus using the contents of the SCOPE and TYPE fields; 3242 */ 3243 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3244 (abort) ? &preempt_and_abort_list : NULL, 3245 type, scope, abort); 3246 /* 3247 * d) Process tasks as defined in 5.7.1; 3248 * e) See above.. 3249 * f) If the type or scope has changed, then for every I_T nexus 3250 * whose reservation key was not removed, except for the I_T 3251 * nexus on which the PERSISTENT RESERVE OUT command was 3252 * received, the device server shall establish a unit 3253 * attention condition for the initiator port associated with 3254 * that I_T nexus, with the additional sense code set to 3255 * RESERVATIONS RELEASED. If the type or scope have not 3256 * changed, then no unit attention condition(s) shall be 3257 * established for this reason. 3258 */ 3259 if ((prh_type != type) || (prh_scope != scope)) { 3260 spin_lock(&pr_tmpl->registration_lock); 3261 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3262 &pr_tmpl->registration_list, pr_reg_list) { 3263 3264 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3265 if (calling_it_nexus) 3266 continue; 3267 3268 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3269 pr_reg->pr_res_mapped_lun, 0x2A, 3270 ASCQ_2AH_RESERVATIONS_RELEASED); 3271 } 3272 spin_unlock(&pr_tmpl->registration_lock); 3273 } 3274 spin_unlock(&dev->dev_reservation_lock); 3275 /* 3276 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3277 * All received CDBs for the matching existing reservation and 3278 * registrations undergo ABORT_TASK logic. 3279 * 3280 * From there, core_scsi3_release_preempt_and_abort() will 3281 * release every registration in the list (which have already 3282 * been removed from the primary pr_reg list), except the 3283 * new persistent reservation holder, the calling Initiator Port. 3284 */ 3285 if (abort) { 3286 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3287 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3288 pr_reg_n); 3289 } 3290 3291 if (pr_tmpl->pr_aptpl_active) { 3292 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3293 &pr_reg_n->pr_aptpl_buf[0], 3294 pr_tmpl->pr_aptpl_buf_len); 3295 if (!ret) 3296 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3297 "%s\n", (abort) ? "_AND_ABORT" : ""); 3298 } 3299 3300 core_scsi3_put_pr_reg(pr_reg_n); 3301 core_scsi3_pr_generation(cmd->se_dev); 3302 return 0; 3303 } 3304 3305 static int core_scsi3_emulate_pro_preempt( 3306 struct se_cmd *cmd, 3307 int type, 3308 int scope, 3309 u64 res_key, 3310 u64 sa_res_key, 3311 int abort) 3312 { 3313 int ret = 0; 3314 3315 switch (type) { 3316 case PR_TYPE_WRITE_EXCLUSIVE: 3317 case PR_TYPE_EXCLUSIVE_ACCESS: 3318 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3319 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3320 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3321 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3322 ret = core_scsi3_pro_preempt(cmd, type, scope, 3323 res_key, sa_res_key, abort); 3324 break; 3325 default: 3326 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3327 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3328 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3329 return -EINVAL; 3330 } 3331 3332 return ret; 3333 } 3334 3335 3336 static int core_scsi3_emulate_pro_register_and_move( 3337 struct se_cmd *cmd, 3338 u64 res_key, 3339 u64 sa_res_key, 3340 int aptpl, 3341 int unreg) 3342 { 3343 struct se_session *se_sess = cmd->se_sess; 3344 struct se_device *dev = cmd->se_dev; 3345 struct se_dev_entry *se_deve, *dest_se_deve = NULL; 3346 struct se_lun *se_lun = cmd->se_lun; 3347 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3348 struct se_port *se_port; 3349 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3350 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3351 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3352 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3353 unsigned char *buf; 3354 unsigned char *initiator_str; 3355 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3356 u32 tid_len, tmp_tid_len; 3357 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3358 unsigned short rtpi; 3359 unsigned char proto_ident; 3360 3361 if (!se_sess || !se_lun) { 3362 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3363 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3364 return -EINVAL; 3365 } 3366 memset(dest_iport, 0, 64); 3367 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3368 se_tpg = se_sess->se_tpg; 3369 tf_ops = se_tpg->se_tpg_tfo; 3370 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3371 /* 3372 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3373 * Register behaviors for a REGISTER AND MOVE service action 3374 * 3375 * Locate the existing *pr_reg via struct se_node_acl pointers 3376 */ 3377 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3378 se_sess); 3379 if (!pr_reg) { 3380 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3381 " *pr_reg for REGISTER_AND_MOVE\n"); 3382 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3383 return -EINVAL; 3384 } 3385 /* 3386 * The provided reservation key much match the existing reservation key 3387 * provided during this initiator's I_T nexus registration. 3388 */ 3389 if (res_key != pr_reg->pr_res_key) { 3390 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3391 " res_key: 0x%016Lx does not match existing SA REGISTER" 3392 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3393 core_scsi3_put_pr_reg(pr_reg); 3394 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3395 return -EINVAL; 3396 } 3397 /* 3398 * The service active reservation key needs to be non zero 3399 */ 3400 if (!sa_res_key) { 3401 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3402 " sa_res_key\n"); 3403 core_scsi3_put_pr_reg(pr_reg); 3404 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3405 return -EINVAL; 3406 } 3407 3408 /* 3409 * Determine the Relative Target Port Identifier where the reservation 3410 * will be moved to for the TransportID containing SCSI initiator WWN 3411 * information. 3412 */ 3413 buf = transport_kmap_first_data_page(cmd); 3414 rtpi = (buf[18] & 0xff) << 8; 3415 rtpi |= buf[19] & 0xff; 3416 tid_len = (buf[20] & 0xff) << 24; 3417 tid_len |= (buf[21] & 0xff) << 16; 3418 tid_len |= (buf[22] & 0xff) << 8; 3419 tid_len |= buf[23] & 0xff; 3420 transport_kunmap_first_data_page(cmd); 3421 buf = NULL; 3422 3423 if ((tid_len + 24) != cmd->data_length) { 3424 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3425 " does not equal CDB data_length: %u\n", tid_len, 3426 cmd->data_length); 3427 core_scsi3_put_pr_reg(pr_reg); 3428 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3429 return -EINVAL; 3430 } 3431 3432 spin_lock(&dev->se_port_lock); 3433 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3434 if (se_port->sep_rtpi != rtpi) 3435 continue; 3436 dest_se_tpg = se_port->sep_tpg; 3437 if (!dest_se_tpg) 3438 continue; 3439 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3440 if (!dest_tf_ops) 3441 continue; 3442 3443 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3444 smp_mb__after_atomic_inc(); 3445 spin_unlock(&dev->se_port_lock); 3446 3447 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3448 if (ret != 0) { 3449 pr_err("core_scsi3_tpg_depend_item() failed" 3450 " for dest_se_tpg\n"); 3451 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3452 smp_mb__after_atomic_dec(); 3453 core_scsi3_put_pr_reg(pr_reg); 3454 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3455 return -EINVAL; 3456 } 3457 3458 spin_lock(&dev->se_port_lock); 3459 break; 3460 } 3461 spin_unlock(&dev->se_port_lock); 3462 3463 if (!dest_se_tpg || !dest_tf_ops) { 3464 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3465 " fabric ops from Relative Target Port Identifier:" 3466 " %hu\n", rtpi); 3467 core_scsi3_put_pr_reg(pr_reg); 3468 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3469 return -EINVAL; 3470 } 3471 3472 buf = transport_kmap_first_data_page(cmd); 3473 proto_ident = (buf[24] & 0x0f); 3474 #if 0 3475 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3476 " 0x%02x\n", proto_ident); 3477 #endif 3478 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3479 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3480 " proto_ident: 0x%02x does not match ident: 0x%02x" 3481 " from fabric: %s\n", proto_ident, 3482 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3483 dest_tf_ops->get_fabric_name()); 3484 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3485 ret = -EINVAL; 3486 goto out; 3487 } 3488 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3489 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3490 " containg a valid tpg_parse_pr_out_transport_id" 3491 " function pointer\n"); 3492 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3493 ret = -EINVAL; 3494 goto out; 3495 } 3496 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3497 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3498 if (!initiator_str) { 3499 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3500 " initiator_str from Transport ID\n"); 3501 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3502 ret = -EINVAL; 3503 goto out; 3504 } 3505 3506 transport_kunmap_first_data_page(cmd); 3507 buf = NULL; 3508 3509 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3510 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3511 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3512 iport_ptr : ""); 3513 /* 3514 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3515 * action specifies a TransportID that is the same as the initiator port 3516 * of the I_T nexus for the command received, then the command shall 3517 * be terminated with CHECK CONDITION status, with the sense key set to 3518 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3519 * IN PARAMETER LIST. 3520 */ 3521 pr_reg_nacl = pr_reg->pr_reg_nacl; 3522 matching_iname = (!strcmp(initiator_str, 3523 pr_reg_nacl->initiatorname)) ? 1 : 0; 3524 if (!matching_iname) 3525 goto after_iport_check; 3526 3527 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3528 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3529 " matches: %s on received I_T Nexus\n", initiator_str, 3530 pr_reg_nacl->initiatorname); 3531 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3532 ret = -EINVAL; 3533 goto out; 3534 } 3535 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3536 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3537 " matches: %s %s on received I_T Nexus\n", 3538 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3539 pr_reg->pr_reg_isid); 3540 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3541 ret = -EINVAL; 3542 goto out; 3543 } 3544 after_iport_check: 3545 /* 3546 * Locate the destination struct se_node_acl from the received Transport ID 3547 */ 3548 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3549 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3550 initiator_str); 3551 if (dest_node_acl) { 3552 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3553 smp_mb__after_atomic_inc(); 3554 } 3555 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3556 3557 if (!dest_node_acl) { 3558 pr_err("Unable to locate %s dest_node_acl for" 3559 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3560 initiator_str); 3561 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3562 ret = -EINVAL; 3563 goto out; 3564 } 3565 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3566 if (ret != 0) { 3567 pr_err("core_scsi3_nodeacl_depend_item() for" 3568 " dest_node_acl\n"); 3569 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3570 smp_mb__after_atomic_dec(); 3571 dest_node_acl = NULL; 3572 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3573 ret = -EINVAL; 3574 goto out; 3575 } 3576 #if 0 3577 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3578 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3579 dest_node_acl->initiatorname); 3580 #endif 3581 /* 3582 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3583 * PORT IDENTIFIER. 3584 */ 3585 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3586 if (!dest_se_deve) { 3587 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3588 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3589 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3590 ret = -EINVAL; 3591 goto out; 3592 } 3593 3594 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3595 if (ret < 0) { 3596 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3597 atomic_dec(&dest_se_deve->pr_ref_count); 3598 smp_mb__after_atomic_dec(); 3599 dest_se_deve = NULL; 3600 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3601 ret = -EINVAL; 3602 goto out; 3603 } 3604 #if 0 3605 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3606 " ACL for dest_se_deve->mapped_lun: %u\n", 3607 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3608 dest_se_deve->mapped_lun); 3609 #endif 3610 /* 3611 * A persistent reservation needs to already existing in order to 3612 * successfully complete the REGISTER_AND_MOVE service action.. 3613 */ 3614 spin_lock(&dev->dev_reservation_lock); 3615 pr_res_holder = dev->dev_pr_res_holder; 3616 if (!pr_res_holder) { 3617 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3618 " currently held\n"); 3619 spin_unlock(&dev->dev_reservation_lock); 3620 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3621 ret = -EINVAL; 3622 goto out; 3623 } 3624 /* 3625 * The received on I_T Nexus must be the reservation holder. 3626 * 3627 * From spc4r17 section 5.7.8 Table 50 -- 3628 * Register behaviors for a REGISTER AND MOVE service action 3629 */ 3630 if (pr_res_holder != pr_reg) { 3631 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3632 " Nexus is not reservation holder\n"); 3633 spin_unlock(&dev->dev_reservation_lock); 3634 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3635 ret = -EINVAL; 3636 goto out; 3637 } 3638 /* 3639 * From spc4r17 section 5.7.8: registering and moving reservation 3640 * 3641 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3642 * action is received and the established persistent reservation is a 3643 * Write Exclusive - All Registrants type or Exclusive Access - 3644 * All Registrants type reservation, then the command shall be completed 3645 * with RESERVATION CONFLICT status. 3646 */ 3647 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3648 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3649 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3650 " reservation for type: %s\n", 3651 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3652 spin_unlock(&dev->dev_reservation_lock); 3653 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3654 ret = -EINVAL; 3655 goto out; 3656 } 3657 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3658 /* 3659 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3660 */ 3661 type = pr_res_holder->pr_res_type; 3662 scope = pr_res_holder->pr_res_type; 3663 /* 3664 * c) Associate the reservation key specified in the SERVICE ACTION 3665 * RESERVATION KEY field with the I_T nexus specified as the 3666 * destination of the register and move, where: 3667 * A) The I_T nexus is specified by the TransportID and the 3668 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3669 * B) Regardless of the TransportID format used, the association for 3670 * the initiator port is based on either the initiator port name 3671 * (see 3.1.71) on SCSI transport protocols where port names are 3672 * required or the initiator port identifier (see 3.1.70) on SCSI 3673 * transport protocols where port names are not required; 3674 * d) Register the reservation key specified in the SERVICE ACTION 3675 * RESERVATION KEY field; 3676 * e) Retain the reservation key specified in the SERVICE ACTION 3677 * RESERVATION KEY field and associated information; 3678 * 3679 * Also, It is not an error for a REGISTER AND MOVE service action to 3680 * register an I_T nexus that is already registered with the same 3681 * reservation key or a different reservation key. 3682 */ 3683 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3684 iport_ptr); 3685 if (!dest_pr_reg) { 3686 ret = core_scsi3_alloc_registration(cmd->se_dev, 3687 dest_node_acl, dest_se_deve, iport_ptr, 3688 sa_res_key, 0, aptpl, 2, 1); 3689 if (ret != 0) { 3690 spin_unlock(&dev->dev_reservation_lock); 3691 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3692 ret = -EINVAL; 3693 goto out; 3694 } 3695 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3696 iport_ptr); 3697 new_reg = 1; 3698 } 3699 /* 3700 * f) Release the persistent reservation for the persistent reservation 3701 * holder (i.e., the I_T nexus on which the 3702 */ 3703 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3704 dev->dev_pr_res_holder, 0); 3705 /* 3706 * g) Move the persistent reservation to the specified I_T nexus using 3707 * the same scope and type as the persistent reservation released in 3708 * item f); and 3709 */ 3710 dev->dev_pr_res_holder = dest_pr_reg; 3711 dest_pr_reg->pr_res_holder = 1; 3712 dest_pr_reg->pr_res_type = type; 3713 pr_reg->pr_res_scope = scope; 3714 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3715 PR_REG_ISID_ID_LEN); 3716 /* 3717 * Increment PRGeneration for existing registrations.. 3718 */ 3719 if (!new_reg) 3720 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3721 spin_unlock(&dev->dev_reservation_lock); 3722 3723 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3724 " created new reservation holder TYPE: %s on object RTPI:" 3725 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3726 core_scsi3_pr_dump_type(type), rtpi, 3727 dest_pr_reg->pr_res_generation); 3728 pr_debug("SPC-3 PR Successfully moved reservation from" 3729 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3730 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3731 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3732 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3733 iport_ptr : ""); 3734 /* 3735 * It is now safe to release configfs group dependencies for destination 3736 * of Transport ID Initiator Device/Port Identifier 3737 */ 3738 core_scsi3_lunacl_undepend_item(dest_se_deve); 3739 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3740 core_scsi3_tpg_undepend_item(dest_se_tpg); 3741 /* 3742 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3743 * nexus on which PERSISTENT RESERVE OUT command was received. 3744 */ 3745 if (unreg) { 3746 spin_lock(&pr_tmpl->registration_lock); 3747 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3748 spin_unlock(&pr_tmpl->registration_lock); 3749 } else 3750 core_scsi3_put_pr_reg(pr_reg); 3751 3752 /* 3753 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3754 * write out the updated metadata to struct file for this SCSI device. 3755 */ 3756 if (!aptpl) { 3757 pr_tmpl->pr_aptpl_active = 0; 3758 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3759 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3760 " REGISTER_AND_MOVE\n"); 3761 } else { 3762 pr_tmpl->pr_aptpl_active = 1; 3763 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3764 &dest_pr_reg->pr_aptpl_buf[0], 3765 pr_tmpl->pr_aptpl_buf_len); 3766 if (!ret) 3767 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3768 " REGISTER_AND_MOVE\n"); 3769 } 3770 3771 transport_kunmap_first_data_page(cmd); 3772 3773 core_scsi3_put_pr_reg(dest_pr_reg); 3774 return 0; 3775 out: 3776 if (buf) 3777 transport_kunmap_first_data_page(cmd); 3778 if (dest_se_deve) 3779 core_scsi3_lunacl_undepend_item(dest_se_deve); 3780 if (dest_node_acl) 3781 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3782 core_scsi3_tpg_undepend_item(dest_se_tpg); 3783 core_scsi3_put_pr_reg(pr_reg); 3784 return ret; 3785 } 3786 3787 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3788 { 3789 unsigned int __v1, __v2; 3790 3791 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3792 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3793 3794 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3795 } 3796 3797 /* 3798 * See spc4r17 section 6.14 Table 170 3799 */ 3800 int target_scsi3_emulate_pr_out(struct se_task *task) 3801 { 3802 struct se_cmd *cmd = task->task_se_cmd; 3803 unsigned char *cdb = &cmd->t_task_cdb[0]; 3804 unsigned char *buf; 3805 u64 res_key, sa_res_key; 3806 int sa, scope, type, aptpl; 3807 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3808 int ret; 3809 3810 /* 3811 * Following spc2r20 5.5.1 Reservations overview: 3812 * 3813 * If a logical unit has been reserved by any RESERVE command and is 3814 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3815 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3816 * initiator or service action and shall terminate with a RESERVATION 3817 * CONFLICT status. 3818 */ 3819 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3820 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3821 " SPC-2 reservation is held, returning" 3822 " RESERVATION_CONFLICT\n"); 3823 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3824 ret = EINVAL; 3825 goto out; 3826 } 3827 3828 /* 3829 * FIXME: A NULL struct se_session pointer means an this is not coming from 3830 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3831 */ 3832 if (!cmd->se_sess) { 3833 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3834 return -EINVAL; 3835 } 3836 3837 if (cmd->data_length < 24) { 3838 pr_warn("SPC-PR: Received PR OUT parameter list" 3839 " length too small: %u\n", cmd->data_length); 3840 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3841 ret = -EINVAL; 3842 goto out; 3843 } 3844 /* 3845 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3846 */ 3847 sa = (cdb[1] & 0x1f); 3848 scope = (cdb[2] & 0xf0); 3849 type = (cdb[2] & 0x0f); 3850 3851 buf = transport_kmap_first_data_page(cmd); 3852 /* 3853 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3854 */ 3855 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3856 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3857 /* 3858 * REGISTER_AND_MOVE uses a different SA parameter list containing 3859 * SCSI TransportIDs. 3860 */ 3861 if (sa != PRO_REGISTER_AND_MOVE) { 3862 spec_i_pt = (buf[20] & 0x08); 3863 all_tg_pt = (buf[20] & 0x04); 3864 aptpl = (buf[20] & 0x01); 3865 } else { 3866 aptpl = (buf[17] & 0x01); 3867 unreg = (buf[17] & 0x02); 3868 } 3869 transport_kunmap_first_data_page(cmd); 3870 buf = NULL; 3871 3872 /* 3873 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3874 */ 3875 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3876 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3877 ret = -EINVAL; 3878 goto out; 3879 } 3880 3881 /* 3882 * From spc4r17 section 6.14: 3883 * 3884 * If the SPEC_I_PT bit is set to zero, the service action is not 3885 * REGISTER AND MOVE, and the parameter list length is not 24, then 3886 * the command shall be terminated with CHECK CONDITION status, with 3887 * the sense key set to ILLEGAL REQUEST, and the additional sense 3888 * code set to PARAMETER LIST LENGTH ERROR. 3889 */ 3890 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3891 (cmd->data_length != 24)) { 3892 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3893 " list length: %u\n", cmd->data_length); 3894 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3895 ret = -EINVAL; 3896 goto out; 3897 } 3898 /* 3899 * (core_scsi3_emulate_pro_* function parameters 3900 * are defined by spc4r17 Table 174: 3901 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3902 */ 3903 switch (sa) { 3904 case PRO_REGISTER: 3905 ret = core_scsi3_emulate_pro_register(cmd, 3906 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3907 break; 3908 case PRO_RESERVE: 3909 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3910 break; 3911 case PRO_RELEASE: 3912 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3913 break; 3914 case PRO_CLEAR: 3915 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3916 break; 3917 case PRO_PREEMPT: 3918 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3919 res_key, sa_res_key, 0); 3920 break; 3921 case PRO_PREEMPT_AND_ABORT: 3922 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3923 res_key, sa_res_key, 1); 3924 break; 3925 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3926 ret = core_scsi3_emulate_pro_register(cmd, 3927 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3928 break; 3929 case PRO_REGISTER_AND_MOVE: 3930 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3931 sa_res_key, aptpl, unreg); 3932 break; 3933 default: 3934 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3935 " action: 0x%02x\n", cdb[1] & 0x1f); 3936 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3937 ret = -EINVAL; 3938 break; 3939 } 3940 3941 out: 3942 if (!ret) { 3943 task->task_scsi_status = GOOD; 3944 transport_complete_task(task, 1); 3945 } 3946 return ret; 3947 } 3948 3949 /* 3950 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3951 * 3952 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3953 */ 3954 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3955 { 3956 struct se_device *se_dev = cmd->se_dev; 3957 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3958 struct t10_pr_registration *pr_reg; 3959 unsigned char *buf; 3960 u32 add_len = 0, off = 8; 3961 3962 if (cmd->data_length < 8) { 3963 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3964 " too small\n", cmd->data_length); 3965 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3966 return -EINVAL; 3967 } 3968 3969 buf = transport_kmap_first_data_page(cmd); 3970 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3971 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3972 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3973 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3974 3975 spin_lock(&su_dev->t10_pr.registration_lock); 3976 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3977 pr_reg_list) { 3978 /* 3979 * Check for overflow of 8byte PRI READ_KEYS payload and 3980 * next reservation key list descriptor. 3981 */ 3982 if ((add_len + 8) > (cmd->data_length - 8)) 3983 break; 3984 3985 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3986 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3987 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3988 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3989 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3990 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3991 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3992 buf[off++] = (pr_reg->pr_res_key & 0xff); 3993 3994 add_len += 8; 3995 } 3996 spin_unlock(&su_dev->t10_pr.registration_lock); 3997 3998 buf[4] = ((add_len >> 24) & 0xff); 3999 buf[5] = ((add_len >> 16) & 0xff); 4000 buf[6] = ((add_len >> 8) & 0xff); 4001 buf[7] = (add_len & 0xff); 4002 4003 transport_kunmap_first_data_page(cmd); 4004 4005 return 0; 4006 } 4007 4008 /* 4009 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4010 * 4011 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4012 */ 4013 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4014 { 4015 struct se_device *se_dev = cmd->se_dev; 4016 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4017 struct t10_pr_registration *pr_reg; 4018 unsigned char *buf; 4019 u64 pr_res_key; 4020 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4021 4022 if (cmd->data_length < 8) { 4023 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4024 " too small\n", cmd->data_length); 4025 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4026 return -EINVAL; 4027 } 4028 4029 buf = transport_kmap_first_data_page(cmd); 4030 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4031 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4032 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4033 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4034 4035 spin_lock(&se_dev->dev_reservation_lock); 4036 pr_reg = se_dev->dev_pr_res_holder; 4037 if ((pr_reg)) { 4038 /* 4039 * Set the hardcoded Additional Length 4040 */ 4041 buf[4] = ((add_len >> 24) & 0xff); 4042 buf[5] = ((add_len >> 16) & 0xff); 4043 buf[6] = ((add_len >> 8) & 0xff); 4044 buf[7] = (add_len & 0xff); 4045 4046 if (cmd->data_length < 22) 4047 goto err; 4048 4049 /* 4050 * Set the Reservation key. 4051 * 4052 * From spc4r17, section 5.7.10: 4053 * A persistent reservation holder has its reservation key 4054 * returned in the parameter data from a PERSISTENT 4055 * RESERVE IN command with READ RESERVATION service action as 4056 * follows: 4057 * a) For a persistent reservation of the type Write Exclusive 4058 * - All Registrants or Exclusive Access All Regitrants, 4059 * the reservation key shall be set to zero; or 4060 * b) For all other persistent reservation types, the 4061 * reservation key shall be set to the registered 4062 * reservation key for the I_T nexus that holds the 4063 * persistent reservation. 4064 */ 4065 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4066 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4067 pr_res_key = 0; 4068 else 4069 pr_res_key = pr_reg->pr_res_key; 4070 4071 buf[8] = ((pr_res_key >> 56) & 0xff); 4072 buf[9] = ((pr_res_key >> 48) & 0xff); 4073 buf[10] = ((pr_res_key >> 40) & 0xff); 4074 buf[11] = ((pr_res_key >> 32) & 0xff); 4075 buf[12] = ((pr_res_key >> 24) & 0xff); 4076 buf[13] = ((pr_res_key >> 16) & 0xff); 4077 buf[14] = ((pr_res_key >> 8) & 0xff); 4078 buf[15] = (pr_res_key & 0xff); 4079 /* 4080 * Set the SCOPE and TYPE 4081 */ 4082 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4083 (pr_reg->pr_res_type & 0x0f); 4084 } 4085 4086 err: 4087 spin_unlock(&se_dev->dev_reservation_lock); 4088 transport_kunmap_first_data_page(cmd); 4089 4090 return 0; 4091 } 4092 4093 /* 4094 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4095 * 4096 * See spc4r17 section 6.13.4 Table 165 4097 */ 4098 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4099 { 4100 struct se_device *dev = cmd->se_dev; 4101 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4102 unsigned char *buf; 4103 u16 add_len = 8; /* Hardcoded to 8. */ 4104 4105 if (cmd->data_length < 6) { 4106 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4107 " %u too small\n", cmd->data_length); 4108 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4109 return -EINVAL; 4110 } 4111 4112 buf = transport_kmap_first_data_page(cmd); 4113 4114 buf[0] = ((add_len << 8) & 0xff); 4115 buf[1] = (add_len & 0xff); 4116 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4117 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4118 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4119 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4120 /* 4121 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4122 * set the TMV: Task Mask Valid bit. 4123 */ 4124 buf[3] |= 0x80; 4125 /* 4126 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4127 */ 4128 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4129 /* 4130 * PTPL_A: Persistence across Target Power Loss Active bit 4131 */ 4132 if (pr_tmpl->pr_aptpl_active) 4133 buf[3] |= 0x01; 4134 /* 4135 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4136 */ 4137 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4138 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4139 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4140 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4141 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4142 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4143 4144 transport_kunmap_first_data_page(cmd); 4145 4146 return 0; 4147 } 4148 4149 /* 4150 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4151 * 4152 * See spc4r17 section 6.13.5 Table 168 and 169 4153 */ 4154 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4155 { 4156 struct se_device *se_dev = cmd->se_dev; 4157 struct se_node_acl *se_nacl; 4158 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4159 struct se_portal_group *se_tpg; 4160 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4161 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4162 unsigned char *buf; 4163 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4164 u32 off = 8; /* off into first Full Status descriptor */ 4165 int format_code = 0; 4166 4167 if (cmd->data_length < 8) { 4168 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4169 " too small\n", cmd->data_length); 4170 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4171 return -EINVAL; 4172 } 4173 4174 buf = transport_kmap_first_data_page(cmd); 4175 4176 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4177 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4178 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4179 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4180 4181 spin_lock(&pr_tmpl->registration_lock); 4182 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4183 &pr_tmpl->registration_list, pr_reg_list) { 4184 4185 se_nacl = pr_reg->pr_reg_nacl; 4186 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4187 add_desc_len = 0; 4188 4189 atomic_inc(&pr_reg->pr_res_holders); 4190 smp_mb__after_atomic_inc(); 4191 spin_unlock(&pr_tmpl->registration_lock); 4192 /* 4193 * Determine expected length of $FABRIC_MOD specific 4194 * TransportID full status descriptor.. 4195 */ 4196 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4197 se_tpg, se_nacl, pr_reg, &format_code); 4198 4199 if ((exp_desc_len + add_len) > cmd->data_length) { 4200 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4201 " out of buffer: %d\n", cmd->data_length); 4202 spin_lock(&pr_tmpl->registration_lock); 4203 atomic_dec(&pr_reg->pr_res_holders); 4204 smp_mb__after_atomic_dec(); 4205 break; 4206 } 4207 /* 4208 * Set RESERVATION KEY 4209 */ 4210 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4211 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4212 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4213 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4214 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4215 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4216 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4217 buf[off++] = (pr_reg->pr_res_key & 0xff); 4218 off += 4; /* Skip Over Reserved area */ 4219 4220 /* 4221 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4222 */ 4223 if (pr_reg->pr_reg_all_tg_pt) 4224 buf[off] = 0x02; 4225 /* 4226 * The struct se_lun pointer will be present for the 4227 * reservation holder for PR_HOLDER bit. 4228 * 4229 * Also, if this registration is the reservation 4230 * holder, fill in SCOPE and TYPE in the next byte. 4231 */ 4232 if (pr_reg->pr_res_holder) { 4233 buf[off++] |= 0x01; 4234 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4235 (pr_reg->pr_res_type & 0x0f); 4236 } else 4237 off += 2; 4238 4239 off += 4; /* Skip over reserved area */ 4240 /* 4241 * From spc4r17 6.3.15: 4242 * 4243 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4244 * IDENTIFIER field contains the relative port identifier (see 4245 * 3.1.120) of the target port that is part of the I_T nexus 4246 * described by this full status descriptor. If the ALL_TG_PT 4247 * bit is set to one, the contents of the RELATIVE TARGET PORT 4248 * IDENTIFIER field are not defined by this standard. 4249 */ 4250 if (!pr_reg->pr_reg_all_tg_pt) { 4251 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4252 4253 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4254 buf[off++] = (port->sep_rtpi & 0xff); 4255 } else 4256 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4257 4258 /* 4259 * Now, have the $FABRIC_MOD fill in the protocol identifier 4260 */ 4261 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4262 se_nacl, pr_reg, &format_code, &buf[off+4]); 4263 4264 spin_lock(&pr_tmpl->registration_lock); 4265 atomic_dec(&pr_reg->pr_res_holders); 4266 smp_mb__after_atomic_dec(); 4267 /* 4268 * Set the ADDITIONAL DESCRIPTOR LENGTH 4269 */ 4270 buf[off++] = ((desc_len >> 24) & 0xff); 4271 buf[off++] = ((desc_len >> 16) & 0xff); 4272 buf[off++] = ((desc_len >> 8) & 0xff); 4273 buf[off++] = (desc_len & 0xff); 4274 /* 4275 * Size of full desctipor header minus TransportID 4276 * containing $FABRIC_MOD specific) initiator device/port 4277 * WWN information. 4278 * 4279 * See spc4r17 Section 6.13.5 Table 169 4280 */ 4281 add_desc_len = (24 + desc_len); 4282 4283 off += desc_len; 4284 add_len += add_desc_len; 4285 } 4286 spin_unlock(&pr_tmpl->registration_lock); 4287 /* 4288 * Set ADDITIONAL_LENGTH 4289 */ 4290 buf[4] = ((add_len >> 24) & 0xff); 4291 buf[5] = ((add_len >> 16) & 0xff); 4292 buf[6] = ((add_len >> 8) & 0xff); 4293 buf[7] = (add_len & 0xff); 4294 4295 transport_kunmap_first_data_page(cmd); 4296 4297 return 0; 4298 } 4299 4300 int target_scsi3_emulate_pr_in(struct se_task *task) 4301 { 4302 struct se_cmd *cmd = task->task_se_cmd; 4303 int ret; 4304 4305 /* 4306 * Following spc2r20 5.5.1 Reservations overview: 4307 * 4308 * If a logical unit has been reserved by any RESERVE command and is 4309 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4310 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4311 * initiator or service action and shall terminate with a RESERVATION 4312 * CONFLICT status. 4313 */ 4314 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4315 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4316 " SPC-2 reservation is held, returning" 4317 " RESERVATION_CONFLICT\n"); 4318 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4319 return -EINVAL; 4320 } 4321 4322 switch (cmd->t_task_cdb[1] & 0x1f) { 4323 case PRI_READ_KEYS: 4324 ret = core_scsi3_pri_read_keys(cmd); 4325 break; 4326 case PRI_READ_RESERVATION: 4327 ret = core_scsi3_pri_read_reservation(cmd); 4328 break; 4329 case PRI_REPORT_CAPABILITIES: 4330 ret = core_scsi3_pri_report_capabilities(cmd); 4331 break; 4332 case PRI_READ_FULL_STATUS: 4333 ret = core_scsi3_pri_read_full_status(cmd); 4334 break; 4335 default: 4336 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4337 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4338 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4339 ret = -EINVAL; 4340 break; 4341 } 4342 4343 if (!ret) { 4344 task->task_scsi_status = GOOD; 4345 transport_complete_task(task, 1); 4346 } 4347 return ret; 4348 } 4349 4350 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4351 { 4352 return 0; 4353 } 4354 4355 static int core_pt_seq_non_holder( 4356 struct se_cmd *cmd, 4357 unsigned char *cdb, 4358 u32 pr_reg_type) 4359 { 4360 return 0; 4361 } 4362 4363 int core_setup_reservations(struct se_device *dev, int force_pt) 4364 { 4365 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4366 struct t10_reservation *rest = &su_dev->t10_pr; 4367 /* 4368 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4369 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4370 * cause a problem because libata and some SATA RAID HBAs appear 4371 * under Linux/SCSI, but to emulate reservations themselves. 4372 */ 4373 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4374 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4375 rest->res_type = SPC_PASSTHROUGH; 4376 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4377 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4378 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4379 " emulation\n", dev->transport->name); 4380 return 0; 4381 } 4382 /* 4383 * If SPC-3 or above is reported by real or emulated struct se_device, 4384 * use emulated Persistent Reservations. 4385 */ 4386 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4387 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4388 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4389 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4390 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4391 " emulation\n", dev->transport->name); 4392 } else { 4393 rest->res_type = SPC2_RESERVATIONS; 4394 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4395 rest->pr_ops.t10_seq_non_holder = 4396 &core_scsi2_reservation_seq_non_holder; 4397 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4398 dev->transport->name); 4399 } 4400 4401 return 0; 4402 } 4403