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 case PERSISTENT_RESERVE_IN: 482 ret = 0; /*/ Allowed CDBs */ 483 break; 484 default: 485 other_cdb = 1; 486 break; 487 } 488 /* 489 * Case where the CDB is explicitly allowed in the above switch 490 * statement. 491 */ 492 if (!ret && !other_cdb) { 493 #if 0 494 pr_debug("Allowing explict CDB: 0x%02x for %s" 495 " reservation holder\n", cdb[0], 496 core_scsi3_pr_dump_type(pr_reg_type)); 497 #endif 498 return ret; 499 } 500 /* 501 * Check if write exclusive initiator ports *NOT* holding the 502 * WRITE_EXCLUSIVE_* reservation. 503 */ 504 if ((we) && !(registered_nexus)) { 505 if (cmd->data_direction == DMA_TO_DEVICE) { 506 /* 507 * Conflict for write exclusive 508 */ 509 pr_debug("%s Conflict for unregistered nexus" 510 " %s CDB: 0x%02x to %s reservation\n", 511 transport_dump_cmd_direction(cmd), 512 se_sess->se_node_acl->initiatorname, cdb[0], 513 core_scsi3_pr_dump_type(pr_reg_type)); 514 return 1; 515 } else { 516 /* 517 * Allow non WRITE CDBs for all Write Exclusive 518 * PR TYPEs to pass for registered and 519 * non-registered_nexuxes NOT holding the reservation. 520 * 521 * We only make noise for the unregisterd nexuses, 522 * as we expect registered non-reservation holding 523 * nexuses to issue CDBs. 524 */ 525 #if 0 526 if (!registered_nexus) { 527 pr_debug("Allowing implict CDB: 0x%02x" 528 " for %s reservation on unregistered" 529 " nexus\n", cdb[0], 530 core_scsi3_pr_dump_type(pr_reg_type)); 531 } 532 #endif 533 return 0; 534 } 535 } else if ((reg_only) || (all_reg)) { 536 if (registered_nexus) { 537 /* 538 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 539 * allow commands from registered nexuses. 540 */ 541 #if 0 542 pr_debug("Allowing implict CDB: 0x%02x for %s" 543 " reservation\n", cdb[0], 544 core_scsi3_pr_dump_type(pr_reg_type)); 545 #endif 546 return 0; 547 } 548 } 549 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 550 " for %s reservation\n", transport_dump_cmd_direction(cmd), 551 (registered_nexus) ? "" : "un", 552 se_sess->se_node_acl->initiatorname, cdb[0], 553 core_scsi3_pr_dump_type(pr_reg_type)); 554 555 return 1; /* Conflict by default */ 556 } 557 558 static u32 core_scsi3_pr_generation(struct se_device *dev) 559 { 560 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 561 u32 prg; 562 /* 563 * PRGeneration field shall contain the value of a 32-bit wrapping 564 * counter mainted by the device server. 565 * 566 * Note that this is done regardless of Active Persist across 567 * Target PowerLoss (APTPL) 568 * 569 * See spc4r17 section 6.3.12 READ_KEYS service action 570 */ 571 spin_lock(&dev->dev_reservation_lock); 572 prg = su_dev->t10_pr.pr_generation++; 573 spin_unlock(&dev->dev_reservation_lock); 574 575 return prg; 576 } 577 578 static int core_scsi3_pr_reservation_check( 579 struct se_cmd *cmd, 580 u32 *pr_reg_type) 581 { 582 struct se_device *dev = cmd->se_dev; 583 struct se_session *sess = cmd->se_sess; 584 int ret; 585 586 if (!sess) 587 return 0; 588 /* 589 * A legacy SPC-2 reservation is being held. 590 */ 591 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 592 return core_scsi2_reservation_check(cmd, pr_reg_type); 593 594 spin_lock(&dev->dev_reservation_lock); 595 if (!dev->dev_pr_res_holder) { 596 spin_unlock(&dev->dev_reservation_lock); 597 return 0; 598 } 599 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 600 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 601 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 602 spin_unlock(&dev->dev_reservation_lock); 603 return -EINVAL; 604 } 605 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 606 spin_unlock(&dev->dev_reservation_lock); 607 return 0; 608 } 609 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 610 sess->sess_bin_isid) ? 0 : -EINVAL; 611 /* 612 * Use bit in *pr_reg_type to notify ISID mismatch in 613 * core_scsi3_pr_seq_non_holder(). 614 */ 615 if (ret != 0) 616 *pr_reg_type |= 0x80000000; 617 spin_unlock(&dev->dev_reservation_lock); 618 619 return ret; 620 } 621 622 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 623 struct se_device *dev, 624 struct se_node_acl *nacl, 625 struct se_dev_entry *deve, 626 unsigned char *isid, 627 u64 sa_res_key, 628 int all_tg_pt, 629 int aptpl) 630 { 631 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 632 struct t10_pr_registration *pr_reg; 633 634 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 635 if (!pr_reg) { 636 pr_err("Unable to allocate struct t10_pr_registration\n"); 637 return NULL; 638 } 639 640 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 641 GFP_ATOMIC); 642 if (!pr_reg->pr_aptpl_buf) { 643 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 644 kmem_cache_free(t10_pr_reg_cache, pr_reg); 645 return NULL; 646 } 647 648 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 649 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 650 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 651 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 652 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 653 atomic_set(&pr_reg->pr_res_holders, 0); 654 pr_reg->pr_reg_nacl = nacl; 655 pr_reg->pr_reg_deve = deve; 656 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 657 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 658 pr_reg->pr_res_key = sa_res_key; 659 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 660 pr_reg->pr_reg_aptpl = aptpl; 661 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 662 /* 663 * If an ISID value for this SCSI Initiator Port exists, 664 * save it to the registration now. 665 */ 666 if (isid != NULL) { 667 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 668 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 669 pr_reg->isid_present_at_reg = 1; 670 } 671 672 return pr_reg; 673 } 674 675 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 676 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 677 678 /* 679 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 680 * modes. 681 */ 682 static struct t10_pr_registration *__core_scsi3_alloc_registration( 683 struct se_device *dev, 684 struct se_node_acl *nacl, 685 struct se_dev_entry *deve, 686 unsigned char *isid, 687 u64 sa_res_key, 688 int all_tg_pt, 689 int aptpl) 690 { 691 struct se_dev_entry *deve_tmp; 692 struct se_node_acl *nacl_tmp; 693 struct se_port *port, *port_tmp; 694 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 695 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 696 int ret; 697 /* 698 * Create a registration for the I_T Nexus upon which the 699 * PROUT REGISTER was received. 700 */ 701 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 702 sa_res_key, all_tg_pt, aptpl); 703 if (!pr_reg) 704 return NULL; 705 /* 706 * Return pointer to pr_reg for ALL_TG_PT=0 707 */ 708 if (!all_tg_pt) 709 return pr_reg; 710 /* 711 * Create list of matching SCSI Initiator Port registrations 712 * for ALL_TG_PT=1 713 */ 714 spin_lock(&dev->se_port_lock); 715 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 716 atomic_inc(&port->sep_tg_pt_ref_cnt); 717 smp_mb__after_atomic_inc(); 718 spin_unlock(&dev->se_port_lock); 719 720 spin_lock_bh(&port->sep_alua_lock); 721 list_for_each_entry(deve_tmp, &port->sep_alua_list, 722 alua_port_list) { 723 /* 724 * This pointer will be NULL for demo mode MappedLUNs 725 * that have not been make explict via a ConfigFS 726 * MappedLUN group for the SCSI Initiator Node ACL. 727 */ 728 if (!deve_tmp->se_lun_acl) 729 continue; 730 731 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 732 /* 733 * Skip the matching struct se_node_acl that is allocated 734 * above.. 735 */ 736 if (nacl == nacl_tmp) 737 continue; 738 /* 739 * Only perform PR registrations for target ports on 740 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 741 * arrived. 742 */ 743 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 744 continue; 745 /* 746 * Look for a matching Initiator Node ACL in ASCII format 747 */ 748 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 749 continue; 750 751 atomic_inc(&deve_tmp->pr_ref_count); 752 smp_mb__after_atomic_inc(); 753 spin_unlock_bh(&port->sep_alua_lock); 754 /* 755 * Grab a configfs group dependency that is released 756 * for the exception path at label out: below, or upon 757 * completion of adding ALL_TG_PT=1 registrations in 758 * __core_scsi3_add_registration() 759 */ 760 ret = core_scsi3_lunacl_depend_item(deve_tmp); 761 if (ret < 0) { 762 pr_err("core_scsi3_lunacl_depend" 763 "_item() failed\n"); 764 atomic_dec(&port->sep_tg_pt_ref_cnt); 765 smp_mb__after_atomic_dec(); 766 atomic_dec(&deve_tmp->pr_ref_count); 767 smp_mb__after_atomic_dec(); 768 goto out; 769 } 770 /* 771 * Located a matching SCSI Initiator Port on a different 772 * port, allocate the pr_reg_atp and attach it to the 773 * pr_reg->pr_reg_atp_list that will be processed once 774 * the original *pr_reg is processed in 775 * __core_scsi3_add_registration() 776 */ 777 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 778 nacl_tmp, deve_tmp, NULL, 779 sa_res_key, all_tg_pt, aptpl); 780 if (!pr_reg_atp) { 781 atomic_dec(&port->sep_tg_pt_ref_cnt); 782 smp_mb__after_atomic_dec(); 783 atomic_dec(&deve_tmp->pr_ref_count); 784 smp_mb__after_atomic_dec(); 785 core_scsi3_lunacl_undepend_item(deve_tmp); 786 goto out; 787 } 788 789 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 790 &pr_reg->pr_reg_atp_list); 791 spin_lock_bh(&port->sep_alua_lock); 792 } 793 spin_unlock_bh(&port->sep_alua_lock); 794 795 spin_lock(&dev->se_port_lock); 796 atomic_dec(&port->sep_tg_pt_ref_cnt); 797 smp_mb__after_atomic_dec(); 798 } 799 spin_unlock(&dev->se_port_lock); 800 801 return pr_reg; 802 out: 803 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 804 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 805 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 806 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 807 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 808 } 809 kmem_cache_free(t10_pr_reg_cache, pr_reg); 810 return NULL; 811 } 812 813 int core_scsi3_alloc_aptpl_registration( 814 struct t10_reservation *pr_tmpl, 815 u64 sa_res_key, 816 unsigned char *i_port, 817 unsigned char *isid, 818 u32 mapped_lun, 819 unsigned char *t_port, 820 u16 tpgt, 821 u32 target_lun, 822 int res_holder, 823 int all_tg_pt, 824 u8 type) 825 { 826 struct t10_pr_registration *pr_reg; 827 828 if (!i_port || !t_port || !sa_res_key) { 829 pr_err("Illegal parameters for APTPL registration\n"); 830 return -EINVAL; 831 } 832 833 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 834 if (!pr_reg) { 835 pr_err("Unable to allocate struct t10_pr_registration\n"); 836 return -ENOMEM; 837 } 838 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 839 840 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 841 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 842 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 843 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 844 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 845 atomic_set(&pr_reg->pr_res_holders, 0); 846 pr_reg->pr_reg_nacl = NULL; 847 pr_reg->pr_reg_deve = NULL; 848 pr_reg->pr_res_mapped_lun = mapped_lun; 849 pr_reg->pr_aptpl_target_lun = target_lun; 850 pr_reg->pr_res_key = sa_res_key; 851 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 852 pr_reg->pr_reg_aptpl = 1; 853 pr_reg->pr_reg_tg_pt_lun = NULL; 854 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 855 pr_reg->pr_res_type = type; 856 /* 857 * If an ISID value had been saved in APTPL metadata for this 858 * SCSI Initiator Port, restore it now. 859 */ 860 if (isid != NULL) { 861 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 862 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 863 pr_reg->isid_present_at_reg = 1; 864 } 865 /* 866 * Copy the i_port and t_port information from caller. 867 */ 868 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 869 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 870 pr_reg->pr_reg_tpgt = tpgt; 871 /* 872 * Set pr_res_holder from caller, the pr_reg who is the reservation 873 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 874 * the Initiator Node LUN ACL from the fabric module is created for 875 * this registration. 876 */ 877 pr_reg->pr_res_holder = res_holder; 878 879 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 880 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 881 " metadata\n", (res_holder) ? "+reservation" : ""); 882 return 0; 883 } 884 885 static void core_scsi3_aptpl_reserve( 886 struct se_device *dev, 887 struct se_portal_group *tpg, 888 struct se_node_acl *node_acl, 889 struct t10_pr_registration *pr_reg) 890 { 891 char i_buf[PR_REG_ISID_ID_LEN]; 892 int prf_isid; 893 894 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 895 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 896 PR_REG_ISID_ID_LEN); 897 898 spin_lock(&dev->dev_reservation_lock); 899 dev->dev_pr_res_holder = pr_reg; 900 spin_unlock(&dev->dev_reservation_lock); 901 902 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 903 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 904 tpg->se_tpg_tfo->get_fabric_name(), 905 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 906 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 907 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 908 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 909 (prf_isid) ? &i_buf[0] : ""); 910 } 911 912 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 913 struct t10_pr_registration *, int, int); 914 915 static int __core_scsi3_check_aptpl_registration( 916 struct se_device *dev, 917 struct se_portal_group *tpg, 918 struct se_lun *lun, 919 u32 target_lun, 920 struct se_node_acl *nacl, 921 struct se_dev_entry *deve) 922 { 923 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 924 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 925 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 926 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 927 u16 tpgt; 928 929 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 930 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 931 /* 932 * Copy Initiator Port information from struct se_node_acl 933 */ 934 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 935 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 936 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 937 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 938 /* 939 * Look for the matching registrations+reservation from those 940 * created from APTPL metadata. Note that multiple registrations 941 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 942 * TransportIDs. 943 */ 944 spin_lock(&pr_tmpl->aptpl_reg_lock); 945 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 946 pr_reg_aptpl_list) { 947 if (!strcmp(pr_reg->pr_iport, i_port) && 948 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 949 !(strcmp(pr_reg->pr_tport, t_port)) && 950 (pr_reg->pr_reg_tpgt == tpgt) && 951 (pr_reg->pr_aptpl_target_lun == target_lun)) { 952 953 pr_reg->pr_reg_nacl = nacl; 954 pr_reg->pr_reg_deve = deve; 955 pr_reg->pr_reg_tg_pt_lun = lun; 956 957 list_del(&pr_reg->pr_reg_aptpl_list); 958 spin_unlock(&pr_tmpl->aptpl_reg_lock); 959 /* 960 * At this point all of the pointers in *pr_reg will 961 * be setup, so go ahead and add the registration. 962 */ 963 964 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 965 /* 966 * If this registration is the reservation holder, 967 * make that happen now.. 968 */ 969 if (pr_reg->pr_res_holder) 970 core_scsi3_aptpl_reserve(dev, tpg, 971 nacl, pr_reg); 972 /* 973 * Reenable pr_aptpl_active to accept new metadata 974 * updates once the SCSI device is active again.. 975 */ 976 spin_lock(&pr_tmpl->aptpl_reg_lock); 977 pr_tmpl->pr_aptpl_active = 1; 978 } 979 } 980 spin_unlock(&pr_tmpl->aptpl_reg_lock); 981 982 return 0; 983 } 984 985 int core_scsi3_check_aptpl_registration( 986 struct se_device *dev, 987 struct se_portal_group *tpg, 988 struct se_lun *lun, 989 struct se_lun_acl *lun_acl) 990 { 991 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 992 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 993 struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun]; 994 995 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 996 return 0; 997 998 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 999 lun->unpacked_lun, nacl, deve); 1000 } 1001 1002 static void __core_scsi3_dump_registration( 1003 struct target_core_fabric_ops *tfo, 1004 struct se_device *dev, 1005 struct se_node_acl *nacl, 1006 struct t10_pr_registration *pr_reg, 1007 int register_type) 1008 { 1009 struct se_portal_group *se_tpg = nacl->se_tpg; 1010 char i_buf[PR_REG_ISID_ID_LEN]; 1011 int prf_isid; 1012 1013 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1014 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1015 PR_REG_ISID_ID_LEN); 1016 1017 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1018 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1019 "_AND_MOVE" : (register_type == 1) ? 1020 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1021 (prf_isid) ? i_buf : ""); 1022 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1023 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1024 tfo->tpg_get_tag(se_tpg)); 1025 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1026 " Port(s)\n", tfo->get_fabric_name(), 1027 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1028 dev->transport->name); 1029 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1030 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1031 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1032 pr_reg->pr_reg_aptpl); 1033 } 1034 1035 /* 1036 * this function can be called with struct se_device->dev_reservation_lock 1037 * when register_move = 1 1038 */ 1039 static void __core_scsi3_add_registration( 1040 struct se_device *dev, 1041 struct se_node_acl *nacl, 1042 struct t10_pr_registration *pr_reg, 1043 int register_type, 1044 int register_move) 1045 { 1046 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1047 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1048 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1049 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1050 1051 /* 1052 * Increment PRgeneration counter for struct se_device upon a successful 1053 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1054 * 1055 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1056 * action, the struct se_device->dev_reservation_lock will already be held, 1057 * so we do not call core_scsi3_pr_generation() which grabs the lock 1058 * for the REGISTER. 1059 */ 1060 pr_reg->pr_res_generation = (register_move) ? 1061 su_dev->t10_pr.pr_generation++ : 1062 core_scsi3_pr_generation(dev); 1063 1064 spin_lock(&pr_tmpl->registration_lock); 1065 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1066 pr_reg->pr_reg_deve->def_pr_registered = 1; 1067 1068 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1069 spin_unlock(&pr_tmpl->registration_lock); 1070 /* 1071 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1072 */ 1073 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1074 return; 1075 /* 1076 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1077 * allocated in __core_scsi3_alloc_registration() 1078 */ 1079 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1080 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1081 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1082 1083 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1084 1085 spin_lock(&pr_tmpl->registration_lock); 1086 list_add_tail(&pr_reg_tmp->pr_reg_list, 1087 &pr_tmpl->registration_list); 1088 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1089 1090 __core_scsi3_dump_registration(tfo, dev, 1091 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1092 register_type); 1093 spin_unlock(&pr_tmpl->registration_lock); 1094 /* 1095 * Drop configfs group dependency reference from 1096 * __core_scsi3_alloc_registration() 1097 */ 1098 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1099 } 1100 } 1101 1102 static int core_scsi3_alloc_registration( 1103 struct se_device *dev, 1104 struct se_node_acl *nacl, 1105 struct se_dev_entry *deve, 1106 unsigned char *isid, 1107 u64 sa_res_key, 1108 int all_tg_pt, 1109 int aptpl, 1110 int register_type, 1111 int register_move) 1112 { 1113 struct t10_pr_registration *pr_reg; 1114 1115 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1116 sa_res_key, all_tg_pt, aptpl); 1117 if (!pr_reg) 1118 return -EPERM; 1119 1120 __core_scsi3_add_registration(dev, nacl, pr_reg, 1121 register_type, register_move); 1122 return 0; 1123 } 1124 1125 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1126 struct se_device *dev, 1127 struct se_node_acl *nacl, 1128 unsigned char *isid) 1129 { 1130 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1131 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1132 struct se_portal_group *tpg; 1133 1134 spin_lock(&pr_tmpl->registration_lock); 1135 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1136 &pr_tmpl->registration_list, pr_reg_list) { 1137 /* 1138 * First look for a matching struct se_node_acl 1139 */ 1140 if (pr_reg->pr_reg_nacl != nacl) 1141 continue; 1142 1143 tpg = pr_reg->pr_reg_nacl->se_tpg; 1144 /* 1145 * If this registration does NOT contain a fabric provided 1146 * ISID, then we have found a match. 1147 */ 1148 if (!pr_reg->isid_present_at_reg) { 1149 /* 1150 * Determine if this SCSI device server requires that 1151 * SCSI Intiatior TransportID w/ ISIDs is enforced 1152 * for fabric modules (iSCSI) requiring them. 1153 */ 1154 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1155 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1156 continue; 1157 } 1158 atomic_inc(&pr_reg->pr_res_holders); 1159 smp_mb__after_atomic_inc(); 1160 spin_unlock(&pr_tmpl->registration_lock); 1161 return pr_reg; 1162 } 1163 /* 1164 * If the *pr_reg contains a fabric defined ISID for multi-value 1165 * SCSI Initiator Port TransportIDs, then we expect a valid 1166 * matching ISID to be provided by the local SCSI Initiator Port. 1167 */ 1168 if (!isid) 1169 continue; 1170 if (strcmp(isid, pr_reg->pr_reg_isid)) 1171 continue; 1172 1173 atomic_inc(&pr_reg->pr_res_holders); 1174 smp_mb__after_atomic_inc(); 1175 spin_unlock(&pr_tmpl->registration_lock); 1176 return pr_reg; 1177 } 1178 spin_unlock(&pr_tmpl->registration_lock); 1179 1180 return NULL; 1181 } 1182 1183 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1184 struct se_device *dev, 1185 struct se_node_acl *nacl, 1186 struct se_session *sess) 1187 { 1188 struct se_portal_group *tpg = nacl->se_tpg; 1189 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1190 1191 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1192 memset(&buf[0], 0, PR_REG_ISID_LEN); 1193 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1194 PR_REG_ISID_LEN); 1195 isid_ptr = &buf[0]; 1196 } 1197 1198 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1199 } 1200 1201 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1202 { 1203 atomic_dec(&pr_reg->pr_res_holders); 1204 smp_mb__after_atomic_dec(); 1205 } 1206 1207 static int core_scsi3_check_implict_release( 1208 struct se_device *dev, 1209 struct t10_pr_registration *pr_reg) 1210 { 1211 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1212 struct t10_pr_registration *pr_res_holder; 1213 int ret = 0; 1214 1215 spin_lock(&dev->dev_reservation_lock); 1216 pr_res_holder = dev->dev_pr_res_holder; 1217 if (!pr_res_holder) { 1218 spin_unlock(&dev->dev_reservation_lock); 1219 return ret; 1220 } 1221 if (pr_res_holder == pr_reg) { 1222 /* 1223 * Perform an implict RELEASE if the registration that 1224 * is being released is holding the reservation. 1225 * 1226 * From spc4r17, section 5.7.11.1: 1227 * 1228 * e) If the I_T nexus is the persistent reservation holder 1229 * and the persistent reservation is not an all registrants 1230 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1231 * service action or REGISTER AND IGNORE EXISTING KEY 1232 * service action with the SERVICE ACTION RESERVATION KEY 1233 * field set to zero (see 5.7.11.3). 1234 */ 1235 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1236 ret = 1; 1237 /* 1238 * For 'All Registrants' reservation types, all existing 1239 * registrations are still processed as reservation holders 1240 * in core_scsi3_pr_seq_non_holder() after the initial 1241 * reservation holder is implictly released here. 1242 */ 1243 } else if (pr_reg->pr_reg_all_tg_pt && 1244 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1245 pr_reg->pr_reg_nacl->initiatorname)) && 1246 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1247 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1248 " UNREGISTER while existing reservation with matching" 1249 " key 0x%016Lx is present from another SCSI Initiator" 1250 " Port\n", pr_reg->pr_res_key); 1251 ret = -EPERM; 1252 } 1253 spin_unlock(&dev->dev_reservation_lock); 1254 1255 return ret; 1256 } 1257 1258 /* 1259 * Called with struct t10_reservation->registration_lock held. 1260 */ 1261 static void __core_scsi3_free_registration( 1262 struct se_device *dev, 1263 struct t10_pr_registration *pr_reg, 1264 struct list_head *preempt_and_abort_list, 1265 int dec_holders) 1266 { 1267 struct target_core_fabric_ops *tfo = 1268 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1269 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1270 char i_buf[PR_REG_ISID_ID_LEN]; 1271 int prf_isid; 1272 1273 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1274 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1275 PR_REG_ISID_ID_LEN); 1276 1277 pr_reg->pr_reg_deve->def_pr_registered = 0; 1278 pr_reg->pr_reg_deve->pr_res_key = 0; 1279 list_del(&pr_reg->pr_reg_list); 1280 /* 1281 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1282 * so call core_scsi3_put_pr_reg() to decrement our reference. 1283 */ 1284 if (dec_holders) 1285 core_scsi3_put_pr_reg(pr_reg); 1286 /* 1287 * Wait until all reference from any other I_T nexuses for this 1288 * *pr_reg have been released. Because list_del() is called above, 1289 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1290 * count back to zero, and we release *pr_reg. 1291 */ 1292 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1293 spin_unlock(&pr_tmpl->registration_lock); 1294 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1295 tfo->get_fabric_name()); 1296 cpu_relax(); 1297 spin_lock(&pr_tmpl->registration_lock); 1298 } 1299 1300 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1301 " Node: %s%s\n", tfo->get_fabric_name(), 1302 pr_reg->pr_reg_nacl->initiatorname, 1303 (prf_isid) ? &i_buf[0] : ""); 1304 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1305 " Port(s)\n", tfo->get_fabric_name(), 1306 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1307 dev->transport->name); 1308 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1309 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1310 pr_reg->pr_res_generation); 1311 1312 if (!preempt_and_abort_list) { 1313 pr_reg->pr_reg_deve = NULL; 1314 pr_reg->pr_reg_nacl = NULL; 1315 kfree(pr_reg->pr_aptpl_buf); 1316 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1317 return; 1318 } 1319 /* 1320 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1321 * are released once the ABORT_TASK_SET has completed.. 1322 */ 1323 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1324 } 1325 1326 void core_scsi3_free_pr_reg_from_nacl( 1327 struct se_device *dev, 1328 struct se_node_acl *nacl) 1329 { 1330 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1331 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1332 /* 1333 * If the passed se_node_acl matches the reservation holder, 1334 * release the reservation. 1335 */ 1336 spin_lock(&dev->dev_reservation_lock); 1337 pr_res_holder = dev->dev_pr_res_holder; 1338 if ((pr_res_holder != NULL) && 1339 (pr_res_holder->pr_reg_nacl == nacl)) 1340 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1341 spin_unlock(&dev->dev_reservation_lock); 1342 /* 1343 * Release any registration associated with the struct se_node_acl. 1344 */ 1345 spin_lock(&pr_tmpl->registration_lock); 1346 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1347 &pr_tmpl->registration_list, pr_reg_list) { 1348 1349 if (pr_reg->pr_reg_nacl != nacl) 1350 continue; 1351 1352 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1353 } 1354 spin_unlock(&pr_tmpl->registration_lock); 1355 } 1356 1357 void core_scsi3_free_all_registrations( 1358 struct se_device *dev) 1359 { 1360 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1361 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1362 1363 spin_lock(&dev->dev_reservation_lock); 1364 pr_res_holder = dev->dev_pr_res_holder; 1365 if (pr_res_holder != NULL) { 1366 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1367 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1368 pr_res_holder, 0); 1369 } 1370 spin_unlock(&dev->dev_reservation_lock); 1371 1372 spin_lock(&pr_tmpl->registration_lock); 1373 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1374 &pr_tmpl->registration_list, pr_reg_list) { 1375 1376 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1377 } 1378 spin_unlock(&pr_tmpl->registration_lock); 1379 1380 spin_lock(&pr_tmpl->aptpl_reg_lock); 1381 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1382 pr_reg_aptpl_list) { 1383 list_del(&pr_reg->pr_reg_aptpl_list); 1384 kfree(pr_reg->pr_aptpl_buf); 1385 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1386 } 1387 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1388 } 1389 1390 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1391 { 1392 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1393 &tpg->tpg_group.cg_item); 1394 } 1395 1396 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1397 { 1398 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1399 &tpg->tpg_group.cg_item); 1400 1401 atomic_dec(&tpg->tpg_pr_ref_count); 1402 smp_mb__after_atomic_dec(); 1403 } 1404 1405 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1406 { 1407 struct se_portal_group *tpg = nacl->se_tpg; 1408 1409 if (nacl->dynamic_node_acl) 1410 return 0; 1411 1412 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1413 &nacl->acl_group.cg_item); 1414 } 1415 1416 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1417 { 1418 struct se_portal_group *tpg = nacl->se_tpg; 1419 1420 if (nacl->dynamic_node_acl) { 1421 atomic_dec(&nacl->acl_pr_ref_count); 1422 smp_mb__after_atomic_dec(); 1423 return; 1424 } 1425 1426 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1427 &nacl->acl_group.cg_item); 1428 1429 atomic_dec(&nacl->acl_pr_ref_count); 1430 smp_mb__after_atomic_dec(); 1431 } 1432 1433 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1434 { 1435 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1436 struct se_node_acl *nacl; 1437 struct se_portal_group *tpg; 1438 /* 1439 * For nacl->dynamic_node_acl=1 1440 */ 1441 if (!lun_acl) 1442 return 0; 1443 1444 nacl = lun_acl->se_lun_nacl; 1445 tpg = nacl->se_tpg; 1446 1447 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1448 &lun_acl->se_lun_group.cg_item); 1449 } 1450 1451 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1452 { 1453 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1454 struct se_node_acl *nacl; 1455 struct se_portal_group *tpg; 1456 /* 1457 * For nacl->dynamic_node_acl=1 1458 */ 1459 if (!lun_acl) { 1460 atomic_dec(&se_deve->pr_ref_count); 1461 smp_mb__after_atomic_dec(); 1462 return; 1463 } 1464 nacl = lun_acl->se_lun_nacl; 1465 tpg = nacl->se_tpg; 1466 1467 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1468 &lun_acl->se_lun_group.cg_item); 1469 1470 atomic_dec(&se_deve->pr_ref_count); 1471 smp_mb__after_atomic_dec(); 1472 } 1473 1474 static int core_scsi3_decode_spec_i_port( 1475 struct se_cmd *cmd, 1476 struct se_portal_group *tpg, 1477 unsigned char *l_isid, 1478 u64 sa_res_key, 1479 int all_tg_pt, 1480 int aptpl) 1481 { 1482 struct se_device *dev = cmd->se_dev; 1483 struct se_port *tmp_port; 1484 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1485 struct se_session *se_sess = cmd->se_sess; 1486 struct se_node_acl *dest_node_acl = NULL; 1487 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1488 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1489 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1490 struct list_head tid_dest_list; 1491 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1492 struct target_core_fabric_ops *tmp_tf_ops; 1493 unsigned char *buf; 1494 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1495 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1496 u32 tpdl, tid_len = 0; 1497 int ret, dest_local_nexus, prf_isid; 1498 u32 dest_rtpi = 0; 1499 1500 memset(dest_iport, 0, 64); 1501 INIT_LIST_HEAD(&tid_dest_list); 1502 1503 local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1504 /* 1505 * Allocate a struct pr_transport_id_holder and setup the 1506 * local_node_acl and local_se_deve pointers and add to 1507 * struct list_head tid_dest_list for add registration 1508 * processing in the loop of tid_dest_list below. 1509 */ 1510 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1511 if (!tidh_new) { 1512 pr_err("Unable to allocate tidh_new\n"); 1513 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1514 return -EINVAL; 1515 } 1516 INIT_LIST_HEAD(&tidh_new->dest_list); 1517 tidh_new->dest_tpg = tpg; 1518 tidh_new->dest_node_acl = se_sess->se_node_acl; 1519 tidh_new->dest_se_deve = local_se_deve; 1520 1521 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1522 se_sess->se_node_acl, local_se_deve, l_isid, 1523 sa_res_key, all_tg_pt, aptpl); 1524 if (!local_pr_reg) { 1525 kfree(tidh_new); 1526 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1527 return -ENOMEM; 1528 } 1529 tidh_new->dest_pr_reg = local_pr_reg; 1530 /* 1531 * The local I_T nexus does not hold any configfs dependances, 1532 * so we set tid_h->dest_local_nexus=1 to prevent the 1533 * configfs_undepend_item() calls in the tid_dest_list loops below. 1534 */ 1535 tidh_new->dest_local_nexus = 1; 1536 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1537 1538 buf = transport_kmap_data_sg(cmd); 1539 /* 1540 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1541 * first extract TransportID Parameter Data Length, and make sure 1542 * the value matches up to the SCSI expected data transfer length. 1543 */ 1544 tpdl = (buf[24] & 0xff) << 24; 1545 tpdl |= (buf[25] & 0xff) << 16; 1546 tpdl |= (buf[26] & 0xff) << 8; 1547 tpdl |= buf[27] & 0xff; 1548 1549 if ((tpdl + 28) != cmd->data_length) { 1550 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1551 " does not equal CDB data_length: %u\n", tpdl, 1552 cmd->data_length); 1553 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1554 ret = -EINVAL; 1555 goto out; 1556 } 1557 /* 1558 * Start processing the received transport IDs using the 1559 * receiving I_T Nexus portal's fabric dependent methods to 1560 * obtain the SCSI Initiator Port/Device Identifiers. 1561 */ 1562 ptr = &buf[28]; 1563 1564 while (tpdl > 0) { 1565 proto_ident = (ptr[0] & 0x0f); 1566 dest_tpg = NULL; 1567 1568 spin_lock(&dev->se_port_lock); 1569 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1570 tmp_tpg = tmp_port->sep_tpg; 1571 if (!tmp_tpg) 1572 continue; 1573 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1574 if (!tmp_tf_ops) 1575 continue; 1576 if (!tmp_tf_ops->get_fabric_proto_ident || 1577 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1578 continue; 1579 /* 1580 * Look for the matching proto_ident provided by 1581 * the received TransportID 1582 */ 1583 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1584 if (tmp_proto_ident != proto_ident) 1585 continue; 1586 dest_rtpi = tmp_port->sep_rtpi; 1587 1588 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1589 tmp_tpg, (const char *)ptr, &tid_len, 1590 &iport_ptr); 1591 if (!i_str) 1592 continue; 1593 1594 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1595 smp_mb__after_atomic_inc(); 1596 spin_unlock(&dev->se_port_lock); 1597 1598 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1599 if (ret != 0) { 1600 pr_err(" core_scsi3_tpg_depend_item()" 1601 " for tmp_tpg\n"); 1602 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1603 smp_mb__after_atomic_dec(); 1604 cmd->scsi_sense_reason = 1605 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1606 ret = -EINVAL; 1607 goto out; 1608 } 1609 /* 1610 * Locate the desination initiator ACL to be registered 1611 * from the decoded fabric module specific TransportID 1612 * at *i_str. 1613 */ 1614 spin_lock_irq(&tmp_tpg->acl_node_lock); 1615 dest_node_acl = __core_tpg_get_initiator_node_acl( 1616 tmp_tpg, i_str); 1617 if (dest_node_acl) { 1618 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1619 smp_mb__after_atomic_inc(); 1620 } 1621 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1622 1623 if (!dest_node_acl) { 1624 core_scsi3_tpg_undepend_item(tmp_tpg); 1625 spin_lock(&dev->se_port_lock); 1626 continue; 1627 } 1628 1629 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1630 if (ret != 0) { 1631 pr_err("configfs_depend_item() failed" 1632 " for dest_node_acl->acl_group\n"); 1633 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1634 smp_mb__after_atomic_dec(); 1635 core_scsi3_tpg_undepend_item(tmp_tpg); 1636 cmd->scsi_sense_reason = 1637 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1638 ret = -EINVAL; 1639 goto out; 1640 } 1641 1642 dest_tpg = tmp_tpg; 1643 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1644 " %s Port RTPI: %hu\n", 1645 dest_tpg->se_tpg_tfo->get_fabric_name(), 1646 dest_node_acl->initiatorname, dest_rtpi); 1647 1648 spin_lock(&dev->se_port_lock); 1649 break; 1650 } 1651 spin_unlock(&dev->se_port_lock); 1652 1653 if (!dest_tpg) { 1654 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1655 " dest_tpg\n"); 1656 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1657 ret = -EINVAL; 1658 goto out; 1659 } 1660 #if 0 1661 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1662 " tid_len: %d for %s + %s\n", 1663 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1664 tpdl, tid_len, i_str, iport_ptr); 1665 #endif 1666 if (tid_len > tpdl) { 1667 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1668 " %u for Transport ID: %s\n", tid_len, ptr); 1669 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1670 core_scsi3_tpg_undepend_item(dest_tpg); 1671 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1672 ret = -EINVAL; 1673 goto out; 1674 } 1675 /* 1676 * Locate the desintation struct se_dev_entry pointer for matching 1677 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1678 * Target Port. 1679 */ 1680 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1681 dest_rtpi); 1682 if (!dest_se_deve) { 1683 pr_err("Unable to locate %s dest_se_deve" 1684 " from destination RTPI: %hu\n", 1685 dest_tpg->se_tpg_tfo->get_fabric_name(), 1686 dest_rtpi); 1687 1688 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1689 core_scsi3_tpg_undepend_item(dest_tpg); 1690 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1691 ret = -EINVAL; 1692 goto out; 1693 } 1694 1695 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1696 if (ret < 0) { 1697 pr_err("core_scsi3_lunacl_depend_item()" 1698 " failed\n"); 1699 atomic_dec(&dest_se_deve->pr_ref_count); 1700 smp_mb__after_atomic_dec(); 1701 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1702 core_scsi3_tpg_undepend_item(dest_tpg); 1703 cmd->scsi_sense_reason = 1704 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1705 ret = -EINVAL; 1706 goto out; 1707 } 1708 #if 0 1709 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1710 " dest_se_deve mapped_lun: %u\n", 1711 dest_tpg->se_tpg_tfo->get_fabric_name(), 1712 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1713 #endif 1714 /* 1715 * Skip any TransportIDs that already have a registration for 1716 * this target port. 1717 */ 1718 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1719 iport_ptr); 1720 if (pr_reg_e) { 1721 core_scsi3_put_pr_reg(pr_reg_e); 1722 core_scsi3_lunacl_undepend_item(dest_se_deve); 1723 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1724 core_scsi3_tpg_undepend_item(dest_tpg); 1725 ptr += tid_len; 1726 tpdl -= tid_len; 1727 tid_len = 0; 1728 continue; 1729 } 1730 /* 1731 * Allocate a struct pr_transport_id_holder and setup 1732 * the dest_node_acl and dest_se_deve pointers for the 1733 * loop below. 1734 */ 1735 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1736 GFP_KERNEL); 1737 if (!tidh_new) { 1738 pr_err("Unable to allocate tidh_new\n"); 1739 core_scsi3_lunacl_undepend_item(dest_se_deve); 1740 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1741 core_scsi3_tpg_undepend_item(dest_tpg); 1742 cmd->scsi_sense_reason = 1743 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1744 ret = -ENOMEM; 1745 goto out; 1746 } 1747 INIT_LIST_HEAD(&tidh_new->dest_list); 1748 tidh_new->dest_tpg = dest_tpg; 1749 tidh_new->dest_node_acl = dest_node_acl; 1750 tidh_new->dest_se_deve = dest_se_deve; 1751 1752 /* 1753 * Allocate, but do NOT add the registration for the 1754 * TransportID referenced SCSI Initiator port. This 1755 * done because of the following from spc4r17 in section 1756 * 6.14.3 wrt SPEC_I_PT: 1757 * 1758 * "If a registration fails for any initiator port (e.g., if th 1759 * logical unit does not have enough resources available to 1760 * hold the registration information), no registrations shall be 1761 * made, and the command shall be terminated with 1762 * CHECK CONDITION status." 1763 * 1764 * That means we call __core_scsi3_alloc_registration() here, 1765 * and then call __core_scsi3_add_registration() in the 1766 * 2nd loop which will never fail. 1767 */ 1768 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1769 dest_node_acl, dest_se_deve, iport_ptr, 1770 sa_res_key, all_tg_pt, aptpl); 1771 if (!dest_pr_reg) { 1772 core_scsi3_lunacl_undepend_item(dest_se_deve); 1773 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1774 core_scsi3_tpg_undepend_item(dest_tpg); 1775 kfree(tidh_new); 1776 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1777 ret = -EINVAL; 1778 goto out; 1779 } 1780 tidh_new->dest_pr_reg = dest_pr_reg; 1781 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1782 1783 ptr += tid_len; 1784 tpdl -= tid_len; 1785 tid_len = 0; 1786 1787 } 1788 1789 transport_kunmap_data_sg(cmd); 1790 1791 /* 1792 * Go ahead and create a registrations from tid_dest_list for the 1793 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1794 * and dest_se_deve. 1795 * 1796 * The SA Reservation Key from the PROUT is set for the 1797 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1798 * means that the TransportID Initiator port will be 1799 * registered on all of the target ports in the SCSI target device 1800 * ALL_TG_PT=0 means the registration will only be for the 1801 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1802 * was received. 1803 */ 1804 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1805 dest_tpg = tidh->dest_tpg; 1806 dest_node_acl = tidh->dest_node_acl; 1807 dest_se_deve = tidh->dest_se_deve; 1808 dest_pr_reg = tidh->dest_pr_reg; 1809 dest_local_nexus = tidh->dest_local_nexus; 1810 1811 list_del(&tidh->dest_list); 1812 kfree(tidh); 1813 1814 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1815 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1816 PR_REG_ISID_ID_LEN); 1817 1818 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1819 dest_pr_reg, 0, 0); 1820 1821 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1822 " registered Transport ID for Node: %s%s Mapped LUN:" 1823 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1824 dest_node_acl->initiatorname, (prf_isid) ? 1825 &i_buf[0] : "", dest_se_deve->mapped_lun); 1826 1827 if (dest_local_nexus) 1828 continue; 1829 1830 core_scsi3_lunacl_undepend_item(dest_se_deve); 1831 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1832 core_scsi3_tpg_undepend_item(dest_tpg); 1833 } 1834 1835 return 0; 1836 out: 1837 transport_kunmap_data_sg(cmd); 1838 /* 1839 * For the failure case, release everything from tid_dest_list 1840 * including *dest_pr_reg and the configfs dependances.. 1841 */ 1842 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1843 dest_tpg = tidh->dest_tpg; 1844 dest_node_acl = tidh->dest_node_acl; 1845 dest_se_deve = tidh->dest_se_deve; 1846 dest_pr_reg = tidh->dest_pr_reg; 1847 dest_local_nexus = tidh->dest_local_nexus; 1848 1849 list_del(&tidh->dest_list); 1850 kfree(tidh); 1851 /* 1852 * Release any extra ALL_TG_PT=1 registrations for 1853 * the SPEC_I_PT=1 case. 1854 */ 1855 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1856 &dest_pr_reg->pr_reg_atp_list, 1857 pr_reg_atp_mem_list) { 1858 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1859 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1860 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1861 } 1862 1863 kfree(dest_pr_reg->pr_aptpl_buf); 1864 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1865 1866 if (dest_local_nexus) 1867 continue; 1868 1869 core_scsi3_lunacl_undepend_item(dest_se_deve); 1870 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1871 core_scsi3_tpg_undepend_item(dest_tpg); 1872 } 1873 return ret; 1874 } 1875 1876 /* 1877 * Called with struct se_device->dev_reservation_lock held 1878 */ 1879 static int __core_scsi3_update_aptpl_buf( 1880 struct se_device *dev, 1881 unsigned char *buf, 1882 u32 pr_aptpl_buf_len, 1883 int clear_aptpl_metadata) 1884 { 1885 struct se_lun *lun; 1886 struct se_portal_group *tpg; 1887 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1888 struct t10_pr_registration *pr_reg; 1889 unsigned char tmp[512], isid_buf[32]; 1890 ssize_t len = 0; 1891 int reg_count = 0; 1892 1893 memset(buf, 0, pr_aptpl_buf_len); 1894 /* 1895 * Called to clear metadata once APTPL has been deactivated. 1896 */ 1897 if (clear_aptpl_metadata) { 1898 snprintf(buf, pr_aptpl_buf_len, 1899 "No Registrations or Reservations\n"); 1900 return 0; 1901 } 1902 /* 1903 * Walk the registration list.. 1904 */ 1905 spin_lock(&su_dev->t10_pr.registration_lock); 1906 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1907 pr_reg_list) { 1908 1909 tmp[0] = '\0'; 1910 isid_buf[0] = '\0'; 1911 tpg = pr_reg->pr_reg_nacl->se_tpg; 1912 lun = pr_reg->pr_reg_tg_pt_lun; 1913 /* 1914 * Write out any ISID value to APTPL metadata that was included 1915 * in the original registration. 1916 */ 1917 if (pr_reg->isid_present_at_reg) 1918 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1919 pr_reg->pr_reg_isid); 1920 /* 1921 * Include special metadata if the pr_reg matches the 1922 * reservation holder. 1923 */ 1924 if (dev->dev_pr_res_holder == pr_reg) { 1925 snprintf(tmp, 512, "PR_REG_START: %d" 1926 "\ninitiator_fabric=%s\n" 1927 "initiator_node=%s\n%s" 1928 "sa_res_key=%llu\n" 1929 "res_holder=1\nres_type=%02x\n" 1930 "res_scope=%02x\nres_all_tg_pt=%d\n" 1931 "mapped_lun=%u\n", reg_count, 1932 tpg->se_tpg_tfo->get_fabric_name(), 1933 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1934 pr_reg->pr_res_key, pr_reg->pr_res_type, 1935 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1936 pr_reg->pr_res_mapped_lun); 1937 } else { 1938 snprintf(tmp, 512, "PR_REG_START: %d\n" 1939 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1940 "sa_res_key=%llu\nres_holder=0\n" 1941 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1942 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1943 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1944 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1945 pr_reg->pr_res_mapped_lun); 1946 } 1947 1948 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1949 pr_err("Unable to update renaming" 1950 " APTPL metadata\n"); 1951 spin_unlock(&su_dev->t10_pr.registration_lock); 1952 return -EMSGSIZE; 1953 } 1954 len += sprintf(buf+len, "%s", tmp); 1955 1956 /* 1957 * Include information about the associated SCSI target port. 1958 */ 1959 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1960 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1961 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1962 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1963 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1964 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1965 1966 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1967 pr_err("Unable to update renaming" 1968 " APTPL metadata\n"); 1969 spin_unlock(&su_dev->t10_pr.registration_lock); 1970 return -EMSGSIZE; 1971 } 1972 len += sprintf(buf+len, "%s", tmp); 1973 reg_count++; 1974 } 1975 spin_unlock(&su_dev->t10_pr.registration_lock); 1976 1977 if (!reg_count) 1978 len += sprintf(buf+len, "No Registrations or Reservations"); 1979 1980 return 0; 1981 } 1982 1983 static int core_scsi3_update_aptpl_buf( 1984 struct se_device *dev, 1985 unsigned char *buf, 1986 u32 pr_aptpl_buf_len, 1987 int clear_aptpl_metadata) 1988 { 1989 int ret; 1990 1991 spin_lock(&dev->dev_reservation_lock); 1992 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 1993 clear_aptpl_metadata); 1994 spin_unlock(&dev->dev_reservation_lock); 1995 1996 return ret; 1997 } 1998 1999 /* 2000 * Called with struct se_device->aptpl_file_mutex held 2001 */ 2002 static int __core_scsi3_write_aptpl_to_file( 2003 struct se_device *dev, 2004 unsigned char *buf, 2005 u32 pr_aptpl_buf_len) 2006 { 2007 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2008 struct file *file; 2009 struct iovec iov[1]; 2010 mm_segment_t old_fs; 2011 int flags = O_RDWR | O_CREAT | O_TRUNC; 2012 char path[512]; 2013 int ret; 2014 2015 memset(iov, 0, sizeof(struct iovec)); 2016 memset(path, 0, 512); 2017 2018 if (strlen(&wwn->unit_serial[0]) >= 512) { 2019 pr_err("WWN value for struct se_device does not fit" 2020 " into path buffer\n"); 2021 return -EMSGSIZE; 2022 } 2023 2024 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2025 file = filp_open(path, flags, 0600); 2026 if (IS_ERR(file) || !file || !file->f_dentry) { 2027 pr_err("filp_open(%s) for APTPL metadata" 2028 " failed\n", path); 2029 return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT); 2030 } 2031 2032 iov[0].iov_base = &buf[0]; 2033 if (!pr_aptpl_buf_len) 2034 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2035 else 2036 iov[0].iov_len = pr_aptpl_buf_len; 2037 2038 old_fs = get_fs(); 2039 set_fs(get_ds()); 2040 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2041 set_fs(old_fs); 2042 2043 if (ret < 0) { 2044 pr_debug("Error writing APTPL metadata file: %s\n", path); 2045 filp_close(file, NULL); 2046 return -EIO; 2047 } 2048 filp_close(file, NULL); 2049 2050 return 0; 2051 } 2052 2053 static int core_scsi3_update_and_write_aptpl( 2054 struct se_device *dev, 2055 unsigned char *in_buf, 2056 u32 in_pr_aptpl_buf_len) 2057 { 2058 unsigned char null_buf[64], *buf; 2059 u32 pr_aptpl_buf_len; 2060 int ret, clear_aptpl_metadata = 0; 2061 /* 2062 * Can be called with a NULL pointer from PROUT service action CLEAR 2063 */ 2064 if (!in_buf) { 2065 memset(null_buf, 0, 64); 2066 buf = &null_buf[0]; 2067 /* 2068 * This will clear the APTPL metadata to: 2069 * "No Registrations or Reservations" status 2070 */ 2071 pr_aptpl_buf_len = 64; 2072 clear_aptpl_metadata = 1; 2073 } else { 2074 buf = in_buf; 2075 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2076 } 2077 2078 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2079 clear_aptpl_metadata); 2080 if (ret != 0) 2081 return ret; 2082 /* 2083 * __core_scsi3_write_aptpl_to_file() will call strlen() 2084 * on the passed buf to determine pr_aptpl_buf_len. 2085 */ 2086 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2087 if (ret != 0) 2088 return ret; 2089 2090 return ret; 2091 } 2092 2093 static int core_scsi3_emulate_pro_register( 2094 struct se_cmd *cmd, 2095 u64 res_key, 2096 u64 sa_res_key, 2097 int aptpl, 2098 int all_tg_pt, 2099 int spec_i_pt, 2100 int ignore_key) 2101 { 2102 struct se_session *se_sess = cmd->se_sess; 2103 struct se_device *dev = cmd->se_dev; 2104 struct se_dev_entry *se_deve; 2105 struct se_lun *se_lun = cmd->se_lun; 2106 struct se_portal_group *se_tpg; 2107 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2108 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2109 /* Used for APTPL metadata w/ UNREGISTER */ 2110 unsigned char *pr_aptpl_buf = NULL; 2111 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2112 int pr_holder = 0, ret = 0, type; 2113 2114 if (!se_sess || !se_lun) { 2115 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2116 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2117 return -EINVAL; 2118 } 2119 se_tpg = se_sess->se_tpg; 2120 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2121 2122 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2123 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2124 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2125 PR_REG_ISID_LEN); 2126 isid_ptr = &isid_buf[0]; 2127 } 2128 /* 2129 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2130 */ 2131 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2132 if (!pr_reg_e) { 2133 if (res_key) { 2134 pr_warn("SPC-3 PR: Reservation Key non-zero" 2135 " for SA REGISTER, returning CONFLICT\n"); 2136 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2137 return -EINVAL; 2138 } 2139 /* 2140 * Do nothing but return GOOD status. 2141 */ 2142 if (!sa_res_key) 2143 return 0; 2144 2145 if (!spec_i_pt) { 2146 /* 2147 * Perform the Service Action REGISTER on the Initiator 2148 * Port Endpoint that the PRO was received from on the 2149 * Logical Unit of the SCSI device server. 2150 */ 2151 ret = core_scsi3_alloc_registration(cmd->se_dev, 2152 se_sess->se_node_acl, se_deve, isid_ptr, 2153 sa_res_key, all_tg_pt, aptpl, 2154 ignore_key, 0); 2155 if (ret != 0) { 2156 pr_err("Unable to allocate" 2157 " struct t10_pr_registration\n"); 2158 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2159 return -EINVAL; 2160 } 2161 } else { 2162 /* 2163 * Register both the Initiator port that received 2164 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2165 * TransportID from Parameter list and loop through 2166 * fabric dependent parameter list while calling 2167 * logic from of core_scsi3_alloc_registration() for 2168 * each TransportID provided SCSI Initiator Port/Device 2169 */ 2170 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2171 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2172 if (ret != 0) 2173 return ret; 2174 } 2175 /* 2176 * Nothing left to do for the APTPL=0 case. 2177 */ 2178 if (!aptpl) { 2179 pr_tmpl->pr_aptpl_active = 0; 2180 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2181 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2182 " REGISTER\n"); 2183 return 0; 2184 } 2185 /* 2186 * Locate the newly allocated local I_T Nexus *pr_reg, and 2187 * update the APTPL metadata information using its 2188 * preallocated *pr_reg->pr_aptpl_buf. 2189 */ 2190 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2191 se_sess->se_node_acl, se_sess); 2192 2193 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2194 &pr_reg->pr_aptpl_buf[0], 2195 pr_tmpl->pr_aptpl_buf_len); 2196 if (!ret) { 2197 pr_tmpl->pr_aptpl_active = 1; 2198 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2199 } 2200 2201 core_scsi3_put_pr_reg(pr_reg); 2202 return ret; 2203 } else { 2204 /* 2205 * Locate the existing *pr_reg via struct se_node_acl pointers 2206 */ 2207 pr_reg = pr_reg_e; 2208 type = pr_reg->pr_res_type; 2209 2210 if (!ignore_key) { 2211 if (res_key != pr_reg->pr_res_key) { 2212 pr_err("SPC-3 PR REGISTER: Received" 2213 " res_key: 0x%016Lx does not match" 2214 " existing SA REGISTER res_key:" 2215 " 0x%016Lx\n", res_key, 2216 pr_reg->pr_res_key); 2217 core_scsi3_put_pr_reg(pr_reg); 2218 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2219 return -EINVAL; 2220 } 2221 } 2222 if (spec_i_pt) { 2223 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2224 " set while sa_res_key=0\n"); 2225 core_scsi3_put_pr_reg(pr_reg); 2226 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2227 return -EINVAL; 2228 } 2229 /* 2230 * An existing ALL_TG_PT=1 registration being released 2231 * must also set ALL_TG_PT=1 in the incoming PROUT. 2232 */ 2233 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2234 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2235 " registration exists, but ALL_TG_PT=1 bit not" 2236 " present in received PROUT\n"); 2237 core_scsi3_put_pr_reg(pr_reg); 2238 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2239 return -EINVAL; 2240 } 2241 /* 2242 * Allocate APTPL metadata buffer used for UNREGISTER ops 2243 */ 2244 if (aptpl) { 2245 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2246 GFP_KERNEL); 2247 if (!pr_aptpl_buf) { 2248 pr_err("Unable to allocate" 2249 " pr_aptpl_buf\n"); 2250 core_scsi3_put_pr_reg(pr_reg); 2251 cmd->scsi_sense_reason = 2252 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2253 return -EINVAL; 2254 } 2255 } 2256 /* 2257 * sa_res_key=0 Unregister Reservation Key for registered I_T 2258 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2259 * Nexus. 2260 */ 2261 if (!sa_res_key) { 2262 pr_holder = core_scsi3_check_implict_release( 2263 cmd->se_dev, pr_reg); 2264 if (pr_holder < 0) { 2265 kfree(pr_aptpl_buf); 2266 core_scsi3_put_pr_reg(pr_reg); 2267 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2268 return -EINVAL; 2269 } 2270 2271 spin_lock(&pr_tmpl->registration_lock); 2272 /* 2273 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2274 * and matching pr_res_key. 2275 */ 2276 if (pr_reg->pr_reg_all_tg_pt) { 2277 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2278 &pr_tmpl->registration_list, 2279 pr_reg_list) { 2280 2281 if (!pr_reg_p->pr_reg_all_tg_pt) 2282 continue; 2283 2284 if (pr_reg_p->pr_res_key != res_key) 2285 continue; 2286 2287 if (pr_reg == pr_reg_p) 2288 continue; 2289 2290 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2291 pr_reg_p->pr_reg_nacl->initiatorname)) 2292 continue; 2293 2294 __core_scsi3_free_registration(dev, 2295 pr_reg_p, NULL, 0); 2296 } 2297 } 2298 /* 2299 * Release the calling I_T Nexus registration now.. 2300 */ 2301 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2302 NULL, 1); 2303 /* 2304 * From spc4r17, section 5.7.11.3 Unregistering 2305 * 2306 * If the persistent reservation is a registrants only 2307 * type, the device server shall establish a unit 2308 * attention condition for the initiator port associated 2309 * with every registered I_T nexus except for the I_T 2310 * nexus on which the PERSISTENT RESERVE OUT command was 2311 * received, with the additional sense code set to 2312 * RESERVATIONS RELEASED. 2313 */ 2314 if (pr_holder && 2315 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2316 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2317 list_for_each_entry(pr_reg_p, 2318 &pr_tmpl->registration_list, 2319 pr_reg_list) { 2320 2321 core_scsi3_ua_allocate( 2322 pr_reg_p->pr_reg_nacl, 2323 pr_reg_p->pr_res_mapped_lun, 2324 0x2A, 2325 ASCQ_2AH_RESERVATIONS_RELEASED); 2326 } 2327 } 2328 spin_unlock(&pr_tmpl->registration_lock); 2329 2330 if (!aptpl) { 2331 pr_tmpl->pr_aptpl_active = 0; 2332 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2333 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2334 " for UNREGISTER\n"); 2335 return 0; 2336 } 2337 2338 ret = core_scsi3_update_and_write_aptpl(dev, 2339 &pr_aptpl_buf[0], 2340 pr_tmpl->pr_aptpl_buf_len); 2341 if (!ret) { 2342 pr_tmpl->pr_aptpl_active = 1; 2343 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2344 " for UNREGISTER\n"); 2345 } 2346 2347 kfree(pr_aptpl_buf); 2348 return ret; 2349 } else { 2350 /* 2351 * Increment PRgeneration counter for struct se_device" 2352 * upon a successful REGISTER, see spc4r17 section 6.3.2 2353 * READ_KEYS service action. 2354 */ 2355 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2356 cmd->se_dev); 2357 pr_reg->pr_res_key = sa_res_key; 2358 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2359 " Key for %s to: 0x%016Lx PRgeneration:" 2360 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2361 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2362 pr_reg->pr_reg_nacl->initiatorname, 2363 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2364 2365 if (!aptpl) { 2366 pr_tmpl->pr_aptpl_active = 0; 2367 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2368 core_scsi3_put_pr_reg(pr_reg); 2369 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2370 " for REGISTER\n"); 2371 return 0; 2372 } 2373 2374 ret = core_scsi3_update_and_write_aptpl(dev, 2375 &pr_aptpl_buf[0], 2376 pr_tmpl->pr_aptpl_buf_len); 2377 if (!ret) { 2378 pr_tmpl->pr_aptpl_active = 1; 2379 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2380 " for REGISTER\n"); 2381 } 2382 2383 kfree(pr_aptpl_buf); 2384 core_scsi3_put_pr_reg(pr_reg); 2385 } 2386 } 2387 return 0; 2388 } 2389 2390 unsigned char *core_scsi3_pr_dump_type(int type) 2391 { 2392 switch (type) { 2393 case PR_TYPE_WRITE_EXCLUSIVE: 2394 return "Write Exclusive Access"; 2395 case PR_TYPE_EXCLUSIVE_ACCESS: 2396 return "Exclusive Access"; 2397 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2398 return "Write Exclusive Access, Registrants Only"; 2399 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2400 return "Exclusive Access, Registrants Only"; 2401 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2402 return "Write Exclusive Access, All Registrants"; 2403 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2404 return "Exclusive Access, All Registrants"; 2405 default: 2406 break; 2407 } 2408 2409 return "Unknown SPC-3 PR Type"; 2410 } 2411 2412 static int core_scsi3_pro_reserve( 2413 struct se_cmd *cmd, 2414 struct se_device *dev, 2415 int type, 2416 int scope, 2417 u64 res_key) 2418 { 2419 struct se_session *se_sess = cmd->se_sess; 2420 struct se_dev_entry *se_deve; 2421 struct se_lun *se_lun = cmd->se_lun; 2422 struct se_portal_group *se_tpg; 2423 struct t10_pr_registration *pr_reg, *pr_res_holder; 2424 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2425 char i_buf[PR_REG_ISID_ID_LEN]; 2426 int ret, prf_isid; 2427 2428 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2429 2430 if (!se_sess || !se_lun) { 2431 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2432 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2433 return -EINVAL; 2434 } 2435 se_tpg = se_sess->se_tpg; 2436 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2437 /* 2438 * Locate the existing *pr_reg via struct se_node_acl pointers 2439 */ 2440 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2441 se_sess); 2442 if (!pr_reg) { 2443 pr_err("SPC-3 PR: Unable to locate" 2444 " PR_REGISTERED *pr_reg for RESERVE\n"); 2445 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2446 return -EINVAL; 2447 } 2448 /* 2449 * From spc4r17 Section 5.7.9: Reserving: 2450 * 2451 * An application client creates a persistent reservation by issuing 2452 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2453 * a registered I_T nexus with the following parameters: 2454 * a) RESERVATION KEY set to the value of the reservation key that is 2455 * registered with the logical unit for the I_T nexus; and 2456 */ 2457 if (res_key != pr_reg->pr_res_key) { 2458 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2459 " does not match existing SA REGISTER res_key:" 2460 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2461 core_scsi3_put_pr_reg(pr_reg); 2462 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2463 return -EINVAL; 2464 } 2465 /* 2466 * From spc4r17 Section 5.7.9: Reserving: 2467 * 2468 * From above: 2469 * b) TYPE field and SCOPE field set to the persistent reservation 2470 * being created. 2471 * 2472 * Only one persistent reservation is allowed at a time per logical unit 2473 * and that persistent reservation has a scope of LU_SCOPE. 2474 */ 2475 if (scope != PR_SCOPE_LU_SCOPE) { 2476 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2477 core_scsi3_put_pr_reg(pr_reg); 2478 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2479 return -EINVAL; 2480 } 2481 /* 2482 * See if we have an existing PR reservation holder pointer at 2483 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2484 * *pr_res_holder. 2485 */ 2486 spin_lock(&dev->dev_reservation_lock); 2487 pr_res_holder = dev->dev_pr_res_holder; 2488 if ((pr_res_holder)) { 2489 /* 2490 * From spc4r17 Section 5.7.9: Reserving: 2491 * 2492 * If the device server receives a PERSISTENT RESERVE OUT 2493 * command from an I_T nexus other than a persistent reservation 2494 * holder (see 5.7.10) that attempts to create a persistent 2495 * reservation when a persistent reservation already exists for 2496 * the logical unit, then the command shall be completed with 2497 * RESERVATION CONFLICT status. 2498 */ 2499 if (pr_res_holder != pr_reg) { 2500 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2501 pr_err("SPC-3 PR: Attempted RESERVE from" 2502 " [%s]: %s while reservation already held by" 2503 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2504 cmd->se_tfo->get_fabric_name(), 2505 se_sess->se_node_acl->initiatorname, 2506 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2507 pr_res_holder->pr_reg_nacl->initiatorname); 2508 2509 spin_unlock(&dev->dev_reservation_lock); 2510 core_scsi3_put_pr_reg(pr_reg); 2511 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2512 return -EINVAL; 2513 } 2514 /* 2515 * From spc4r17 Section 5.7.9: Reserving: 2516 * 2517 * If a persistent reservation holder attempts to modify the 2518 * type or scope of an existing persistent reservation, the 2519 * command shall be completed with RESERVATION CONFLICT status. 2520 */ 2521 if ((pr_res_holder->pr_res_type != type) || 2522 (pr_res_holder->pr_res_scope != scope)) { 2523 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2524 pr_err("SPC-3 PR: Attempted RESERVE from" 2525 " [%s]: %s trying to change TYPE and/or SCOPE," 2526 " while reservation already held by [%s]: %s," 2527 " returning RESERVATION_CONFLICT\n", 2528 cmd->se_tfo->get_fabric_name(), 2529 se_sess->se_node_acl->initiatorname, 2530 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2531 pr_res_holder->pr_reg_nacl->initiatorname); 2532 2533 spin_unlock(&dev->dev_reservation_lock); 2534 core_scsi3_put_pr_reg(pr_reg); 2535 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2536 return -EINVAL; 2537 } 2538 /* 2539 * From spc4r17 Section 5.7.9: Reserving: 2540 * 2541 * If the device server receives a PERSISTENT RESERVE OUT 2542 * command with RESERVE service action where the TYPE field and 2543 * the SCOPE field contain the same values as the existing type 2544 * and scope from a persistent reservation holder, it shall not 2545 * make any change to the existing persistent reservation and 2546 * shall completethe command with GOOD status. 2547 */ 2548 spin_unlock(&dev->dev_reservation_lock); 2549 core_scsi3_put_pr_reg(pr_reg); 2550 return 0; 2551 } 2552 /* 2553 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2554 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2555 */ 2556 pr_reg->pr_res_scope = scope; 2557 pr_reg->pr_res_type = type; 2558 pr_reg->pr_res_holder = 1; 2559 dev->dev_pr_res_holder = pr_reg; 2560 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2561 PR_REG_ISID_ID_LEN); 2562 2563 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2564 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2565 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2566 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2567 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2568 cmd->se_tfo->get_fabric_name(), 2569 se_sess->se_node_acl->initiatorname, 2570 (prf_isid) ? &i_buf[0] : ""); 2571 spin_unlock(&dev->dev_reservation_lock); 2572 2573 if (pr_tmpl->pr_aptpl_active) { 2574 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2575 &pr_reg->pr_aptpl_buf[0], 2576 pr_tmpl->pr_aptpl_buf_len); 2577 if (!ret) 2578 pr_debug("SPC-3 PR: Updated APTPL metadata" 2579 " for RESERVE\n"); 2580 } 2581 2582 core_scsi3_put_pr_reg(pr_reg); 2583 return 0; 2584 } 2585 2586 static int core_scsi3_emulate_pro_reserve( 2587 struct se_cmd *cmd, 2588 int type, 2589 int scope, 2590 u64 res_key) 2591 { 2592 struct se_device *dev = cmd->se_dev; 2593 int ret = 0; 2594 2595 switch (type) { 2596 case PR_TYPE_WRITE_EXCLUSIVE: 2597 case PR_TYPE_EXCLUSIVE_ACCESS: 2598 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2599 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2600 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2601 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2602 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2603 break; 2604 default: 2605 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2606 " 0x%02x\n", type); 2607 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2608 return -EINVAL; 2609 } 2610 2611 return ret; 2612 } 2613 2614 /* 2615 * Called with struct se_device->dev_reservation_lock held. 2616 */ 2617 static void __core_scsi3_complete_pro_release( 2618 struct se_device *dev, 2619 struct se_node_acl *se_nacl, 2620 struct t10_pr_registration *pr_reg, 2621 int explict) 2622 { 2623 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2624 char i_buf[PR_REG_ISID_ID_LEN]; 2625 int prf_isid; 2626 2627 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2628 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2629 PR_REG_ISID_ID_LEN); 2630 /* 2631 * Go ahead and release the current PR reservation holder. 2632 */ 2633 dev->dev_pr_res_holder = NULL; 2634 2635 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2636 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2637 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2638 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2639 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2640 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2641 tfo->get_fabric_name(), se_nacl->initiatorname, 2642 (prf_isid) ? &i_buf[0] : ""); 2643 /* 2644 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2645 */ 2646 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2647 } 2648 2649 static int core_scsi3_emulate_pro_release( 2650 struct se_cmd *cmd, 2651 int type, 2652 int scope, 2653 u64 res_key) 2654 { 2655 struct se_device *dev = cmd->se_dev; 2656 struct se_session *se_sess = cmd->se_sess; 2657 struct se_lun *se_lun = cmd->se_lun; 2658 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2659 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2660 int ret, all_reg = 0; 2661 2662 if (!se_sess || !se_lun) { 2663 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2664 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2665 return -EINVAL; 2666 } 2667 /* 2668 * Locate the existing *pr_reg via struct se_node_acl pointers 2669 */ 2670 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2671 if (!pr_reg) { 2672 pr_err("SPC-3 PR: Unable to locate" 2673 " PR_REGISTERED *pr_reg for RELEASE\n"); 2674 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2675 return -EINVAL; 2676 } 2677 /* 2678 * From spc4r17 Section 5.7.11.2 Releasing: 2679 * 2680 * If there is no persistent reservation or in response to a persistent 2681 * reservation release request from a registered I_T nexus that is not a 2682 * persistent reservation holder (see 5.7.10), the device server shall 2683 * do the following: 2684 * 2685 * a) Not release the persistent reservation, if any; 2686 * b) Not remove any registrations; and 2687 * c) Complete the command with GOOD status. 2688 */ 2689 spin_lock(&dev->dev_reservation_lock); 2690 pr_res_holder = dev->dev_pr_res_holder; 2691 if (!pr_res_holder) { 2692 /* 2693 * No persistent reservation, return GOOD status. 2694 */ 2695 spin_unlock(&dev->dev_reservation_lock); 2696 core_scsi3_put_pr_reg(pr_reg); 2697 return 0; 2698 } 2699 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2700 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2701 all_reg = 1; 2702 2703 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2704 /* 2705 * Non 'All Registrants' PR Type cases.. 2706 * Release request from a registered I_T nexus that is not a 2707 * persistent reservation holder. return GOOD status. 2708 */ 2709 spin_unlock(&dev->dev_reservation_lock); 2710 core_scsi3_put_pr_reg(pr_reg); 2711 return 0; 2712 } 2713 /* 2714 * From spc4r17 Section 5.7.11.2 Releasing: 2715 * 2716 * Only the persistent reservation holder (see 5.7.10) is allowed to 2717 * release a persistent reservation. 2718 * 2719 * An application client releases the persistent reservation by issuing 2720 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2721 * an I_T nexus that is a persistent reservation holder with the 2722 * following parameters: 2723 * 2724 * a) RESERVATION KEY field set to the value of the reservation key 2725 * that is registered with the logical unit for the I_T nexus; 2726 */ 2727 if (res_key != pr_reg->pr_res_key) { 2728 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2729 " does not match existing SA REGISTER res_key:" 2730 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2731 spin_unlock(&dev->dev_reservation_lock); 2732 core_scsi3_put_pr_reg(pr_reg); 2733 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2734 return -EINVAL; 2735 } 2736 /* 2737 * From spc4r17 Section 5.7.11.2 Releasing and above: 2738 * 2739 * b) TYPE field and SCOPE field set to match the persistent 2740 * reservation being released. 2741 */ 2742 if ((pr_res_holder->pr_res_type != type) || 2743 (pr_res_holder->pr_res_scope != scope)) { 2744 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2745 pr_err("SPC-3 PR RELEASE: Attempted to release" 2746 " reservation from [%s]: %s with different TYPE " 2747 "and/or SCOPE while reservation already held by" 2748 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2749 cmd->se_tfo->get_fabric_name(), 2750 se_sess->se_node_acl->initiatorname, 2751 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2752 pr_res_holder->pr_reg_nacl->initiatorname); 2753 2754 spin_unlock(&dev->dev_reservation_lock); 2755 core_scsi3_put_pr_reg(pr_reg); 2756 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2757 return -EINVAL; 2758 } 2759 /* 2760 * In response to a persistent reservation release request from the 2761 * persistent reservation holder the device server shall perform a 2762 * release by doing the following as an uninterrupted series of actions: 2763 * a) Release the persistent reservation; 2764 * b) Not remove any registration(s); 2765 * c) If the released persistent reservation is a registrants only type 2766 * or all registrants type persistent reservation, 2767 * the device server shall establish a unit attention condition for 2768 * the initiator port associated with every regis- 2769 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2770 * RESERVE OUT command with RELEASE service action was received, 2771 * with the additional sense code set to RESERVATIONS RELEASED; and 2772 * d) If the persistent reservation is of any other type, the device 2773 * server shall not establish a unit attention condition. 2774 */ 2775 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2776 pr_reg, 1); 2777 2778 spin_unlock(&dev->dev_reservation_lock); 2779 2780 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2781 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2782 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2783 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2784 /* 2785 * If no UNIT ATTENTION conditions will be established for 2786 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2787 * go ahead and check for APTPL=1 update+write below 2788 */ 2789 goto write_aptpl; 2790 } 2791 2792 spin_lock(&pr_tmpl->registration_lock); 2793 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2794 pr_reg_list) { 2795 /* 2796 * Do not establish a UNIT ATTENTION condition 2797 * for the calling I_T Nexus 2798 */ 2799 if (pr_reg_p == pr_reg) 2800 continue; 2801 2802 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2803 pr_reg_p->pr_res_mapped_lun, 2804 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2805 } 2806 spin_unlock(&pr_tmpl->registration_lock); 2807 2808 write_aptpl: 2809 if (pr_tmpl->pr_aptpl_active) { 2810 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2811 &pr_reg->pr_aptpl_buf[0], 2812 pr_tmpl->pr_aptpl_buf_len); 2813 if (!ret) 2814 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2815 } 2816 2817 core_scsi3_put_pr_reg(pr_reg); 2818 return 0; 2819 } 2820 2821 static int core_scsi3_emulate_pro_clear( 2822 struct se_cmd *cmd, 2823 u64 res_key) 2824 { 2825 struct se_device *dev = cmd->se_dev; 2826 struct se_node_acl *pr_reg_nacl; 2827 struct se_session *se_sess = cmd->se_sess; 2828 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2829 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2830 u32 pr_res_mapped_lun = 0; 2831 int calling_it_nexus = 0; 2832 /* 2833 * Locate the existing *pr_reg via struct se_node_acl pointers 2834 */ 2835 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2836 se_sess->se_node_acl, se_sess); 2837 if (!pr_reg_n) { 2838 pr_err("SPC-3 PR: Unable to locate" 2839 " PR_REGISTERED *pr_reg for CLEAR\n"); 2840 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2841 return -EINVAL; 2842 } 2843 /* 2844 * From spc4r17 section 5.7.11.6, Clearing: 2845 * 2846 * Any application client may release the persistent reservation and 2847 * remove all registrations from a device server by issuing a 2848 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2849 * registered I_T nexus with the following parameter: 2850 * 2851 * a) RESERVATION KEY field set to the value of the reservation key 2852 * that is registered with the logical unit for the I_T nexus. 2853 */ 2854 if (res_key != pr_reg_n->pr_res_key) { 2855 pr_err("SPC-3 PR REGISTER: Received" 2856 " res_key: 0x%016Lx does not match" 2857 " existing SA REGISTER res_key:" 2858 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2859 core_scsi3_put_pr_reg(pr_reg_n); 2860 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2861 return -EINVAL; 2862 } 2863 /* 2864 * a) Release the persistent reservation, if any; 2865 */ 2866 spin_lock(&dev->dev_reservation_lock); 2867 pr_res_holder = dev->dev_pr_res_holder; 2868 if (pr_res_holder) { 2869 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2870 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2871 pr_res_holder, 0); 2872 } 2873 spin_unlock(&dev->dev_reservation_lock); 2874 /* 2875 * b) Remove all registration(s) (see spc4r17 5.7.7); 2876 */ 2877 spin_lock(&pr_tmpl->registration_lock); 2878 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2879 &pr_tmpl->registration_list, pr_reg_list) { 2880 2881 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2882 pr_reg_nacl = pr_reg->pr_reg_nacl; 2883 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2884 __core_scsi3_free_registration(dev, pr_reg, NULL, 2885 calling_it_nexus); 2886 /* 2887 * e) Establish a unit attention condition for the initiator 2888 * port associated with every registered I_T nexus other 2889 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2890 * command with CLEAR service action was received, with the 2891 * additional sense code set to RESERVATIONS PREEMPTED. 2892 */ 2893 if (!calling_it_nexus) 2894 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2895 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2896 } 2897 spin_unlock(&pr_tmpl->registration_lock); 2898 2899 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2900 cmd->se_tfo->get_fabric_name()); 2901 2902 if (pr_tmpl->pr_aptpl_active) { 2903 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2904 pr_debug("SPC-3 PR: Updated APTPL metadata" 2905 " for CLEAR\n"); 2906 } 2907 2908 core_scsi3_pr_generation(dev); 2909 return 0; 2910 } 2911 2912 /* 2913 * Called with struct se_device->dev_reservation_lock held. 2914 */ 2915 static void __core_scsi3_complete_pro_preempt( 2916 struct se_device *dev, 2917 struct t10_pr_registration *pr_reg, 2918 struct list_head *preempt_and_abort_list, 2919 int type, 2920 int scope, 2921 int abort) 2922 { 2923 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2924 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2925 char i_buf[PR_REG_ISID_ID_LEN]; 2926 int prf_isid; 2927 2928 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2929 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2930 PR_REG_ISID_ID_LEN); 2931 /* 2932 * Do an implict RELEASE of the existing reservation. 2933 */ 2934 if (dev->dev_pr_res_holder) 2935 __core_scsi3_complete_pro_release(dev, nacl, 2936 dev->dev_pr_res_holder, 0); 2937 2938 dev->dev_pr_res_holder = pr_reg; 2939 pr_reg->pr_res_holder = 1; 2940 pr_reg->pr_res_type = type; 2941 pr_reg->pr_res_scope = scope; 2942 2943 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2944 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2945 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2946 core_scsi3_pr_dump_type(type), 2947 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2948 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2949 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2950 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2951 /* 2952 * For PREEMPT_AND_ABORT, add the preempting reservation's 2953 * struct t10_pr_registration to the list that will be compared 2954 * against received CDBs.. 2955 */ 2956 if (preempt_and_abort_list) 2957 list_add_tail(&pr_reg->pr_reg_abort_list, 2958 preempt_and_abort_list); 2959 } 2960 2961 static void core_scsi3_release_preempt_and_abort( 2962 struct list_head *preempt_and_abort_list, 2963 struct t10_pr_registration *pr_reg_holder) 2964 { 2965 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2966 2967 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2968 pr_reg_abort_list) { 2969 2970 list_del(&pr_reg->pr_reg_abort_list); 2971 if (pr_reg_holder == pr_reg) 2972 continue; 2973 if (pr_reg->pr_res_holder) { 2974 pr_warn("pr_reg->pr_res_holder still set\n"); 2975 continue; 2976 } 2977 2978 pr_reg->pr_reg_deve = NULL; 2979 pr_reg->pr_reg_nacl = NULL; 2980 kfree(pr_reg->pr_aptpl_buf); 2981 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2982 } 2983 } 2984 2985 static int core_scsi3_pro_preempt( 2986 struct se_cmd *cmd, 2987 int type, 2988 int scope, 2989 u64 res_key, 2990 u64 sa_res_key, 2991 int abort) 2992 { 2993 struct se_device *dev = cmd->se_dev; 2994 struct se_dev_entry *se_deve; 2995 struct se_node_acl *pr_reg_nacl; 2996 struct se_session *se_sess = cmd->se_sess; 2997 struct list_head preempt_and_abort_list; 2998 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2999 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3000 u32 pr_res_mapped_lun = 0; 3001 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3002 int prh_type = 0, prh_scope = 0, ret; 3003 3004 if (!se_sess) { 3005 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3006 return -EINVAL; 3007 } 3008 3009 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3010 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3011 se_sess); 3012 if (!pr_reg_n) { 3013 pr_err("SPC-3 PR: Unable to locate" 3014 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3015 (abort) ? "_AND_ABORT" : ""); 3016 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3017 return -EINVAL; 3018 } 3019 if (pr_reg_n->pr_res_key != res_key) { 3020 core_scsi3_put_pr_reg(pr_reg_n); 3021 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3022 return -EINVAL; 3023 } 3024 if (scope != PR_SCOPE_LU_SCOPE) { 3025 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3026 core_scsi3_put_pr_reg(pr_reg_n); 3027 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3028 return -EINVAL; 3029 } 3030 INIT_LIST_HEAD(&preempt_and_abort_list); 3031 3032 spin_lock(&dev->dev_reservation_lock); 3033 pr_res_holder = dev->dev_pr_res_holder; 3034 if (pr_res_holder && 3035 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3036 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3037 all_reg = 1; 3038 3039 if (!all_reg && !sa_res_key) { 3040 spin_unlock(&dev->dev_reservation_lock); 3041 core_scsi3_put_pr_reg(pr_reg_n); 3042 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3043 return -EINVAL; 3044 } 3045 /* 3046 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3047 * 3048 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3049 * persistent reservation holder or there is no persistent reservation 3050 * holder (i.e., there is no persistent reservation), then the device 3051 * server shall perform a preempt by doing the following in an 3052 * uninterrupted series of actions. (See below..) 3053 */ 3054 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3055 /* 3056 * No existing or SA Reservation Key matching reservations.. 3057 * 3058 * PROUT SA PREEMPT with All Registrant type reservations are 3059 * allowed to be processed without a matching SA Reservation Key 3060 */ 3061 spin_lock(&pr_tmpl->registration_lock); 3062 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3063 &pr_tmpl->registration_list, pr_reg_list) { 3064 /* 3065 * Removing of registrations in non all registrants 3066 * type reservations without a matching SA reservation 3067 * key. 3068 * 3069 * a) Remove the registrations for all I_T nexuses 3070 * specified by the SERVICE ACTION RESERVATION KEY 3071 * field; 3072 * b) Ignore the contents of the SCOPE and TYPE fields; 3073 * c) Process tasks as defined in 5.7.1; and 3074 * d) Establish a unit attention condition for the 3075 * initiator port associated with every I_T nexus 3076 * that lost its registration other than the I_T 3077 * nexus on which the PERSISTENT RESERVE OUT command 3078 * was received, with the additional sense code set 3079 * to REGISTRATIONS PREEMPTED. 3080 */ 3081 if (!all_reg) { 3082 if (pr_reg->pr_res_key != sa_res_key) 3083 continue; 3084 3085 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3086 pr_reg_nacl = pr_reg->pr_reg_nacl; 3087 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3088 __core_scsi3_free_registration(dev, pr_reg, 3089 (abort) ? &preempt_and_abort_list : 3090 NULL, calling_it_nexus); 3091 released_regs++; 3092 } else { 3093 /* 3094 * Case for any existing all registrants type 3095 * reservation, follow logic in spc4r17 section 3096 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3097 * 3098 * For a ZERO SA Reservation key, release 3099 * all other registrations and do an implict 3100 * release of active persistent reservation. 3101 * 3102 * For a non-ZERO SA Reservation key, only 3103 * release the matching reservation key from 3104 * registrations. 3105 */ 3106 if ((sa_res_key) && 3107 (pr_reg->pr_res_key != sa_res_key)) 3108 continue; 3109 3110 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3111 if (calling_it_nexus) 3112 continue; 3113 3114 pr_reg_nacl = pr_reg->pr_reg_nacl; 3115 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3116 __core_scsi3_free_registration(dev, pr_reg, 3117 (abort) ? &preempt_and_abort_list : 3118 NULL, 0); 3119 released_regs++; 3120 } 3121 if (!calling_it_nexus) 3122 core_scsi3_ua_allocate(pr_reg_nacl, 3123 pr_res_mapped_lun, 0x2A, 3124 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3125 } 3126 spin_unlock(&pr_tmpl->registration_lock); 3127 /* 3128 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3129 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3130 * RESERVATION KEY field to a value that does not match any 3131 * registered reservation key, then the device server shall 3132 * complete the command with RESERVATION CONFLICT status. 3133 */ 3134 if (!released_regs) { 3135 spin_unlock(&dev->dev_reservation_lock); 3136 core_scsi3_put_pr_reg(pr_reg_n); 3137 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3138 return -EINVAL; 3139 } 3140 /* 3141 * For an existing all registrants type reservation 3142 * with a zero SA rservation key, preempt the existing 3143 * reservation with the new PR type and scope. 3144 */ 3145 if (pr_res_holder && all_reg && !(sa_res_key)) { 3146 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3147 (abort) ? &preempt_and_abort_list : NULL, 3148 type, scope, abort); 3149 3150 if (abort) 3151 core_scsi3_release_preempt_and_abort( 3152 &preempt_and_abort_list, pr_reg_n); 3153 } 3154 spin_unlock(&dev->dev_reservation_lock); 3155 3156 if (pr_tmpl->pr_aptpl_active) { 3157 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3158 &pr_reg_n->pr_aptpl_buf[0], 3159 pr_tmpl->pr_aptpl_buf_len); 3160 if (!ret) 3161 pr_debug("SPC-3 PR: Updated APTPL" 3162 " metadata for PREEMPT%s\n", (abort) ? 3163 "_AND_ABORT" : ""); 3164 } 3165 3166 core_scsi3_put_pr_reg(pr_reg_n); 3167 core_scsi3_pr_generation(cmd->se_dev); 3168 return 0; 3169 } 3170 /* 3171 * The PREEMPTing SA reservation key matches that of the 3172 * existing persistent reservation, first, we check if 3173 * we are preempting our own reservation. 3174 * From spc4r17, section 5.7.11.4.3 Preempting 3175 * persistent reservations and registration handling 3176 * 3177 * If an all registrants persistent reservation is not 3178 * present, it is not an error for the persistent 3179 * reservation holder to preempt itself (i.e., a 3180 * PERSISTENT RESERVE OUT with a PREEMPT service action 3181 * or a PREEMPT AND ABORT service action with the 3182 * SERVICE ACTION RESERVATION KEY value equal to the 3183 * persistent reservation holder's reservation key that 3184 * is received from the persistent reservation holder). 3185 * In that case, the device server shall establish the 3186 * new persistent reservation and maintain the 3187 * registration. 3188 */ 3189 prh_type = pr_res_holder->pr_res_type; 3190 prh_scope = pr_res_holder->pr_res_scope; 3191 /* 3192 * If the SERVICE ACTION RESERVATION KEY field identifies a 3193 * persistent reservation holder (see 5.7.10), the device 3194 * server shall perform a preempt by doing the following as 3195 * an uninterrupted series of actions: 3196 * 3197 * a) Release the persistent reservation for the holder 3198 * identified by the SERVICE ACTION RESERVATION KEY field; 3199 */ 3200 if (pr_reg_n != pr_res_holder) 3201 __core_scsi3_complete_pro_release(dev, 3202 pr_res_holder->pr_reg_nacl, 3203 dev->dev_pr_res_holder, 0); 3204 /* 3205 * b) Remove the registrations for all I_T nexuses identified 3206 * by the SERVICE ACTION RESERVATION KEY field, except the 3207 * I_T nexus that is being used for the PERSISTENT RESERVE 3208 * OUT command. If an all registrants persistent reservation 3209 * is present and the SERVICE ACTION RESERVATION KEY field 3210 * is set to zero, then all registrations shall be removed 3211 * except for that of the I_T nexus that is being used for 3212 * the PERSISTENT RESERVE OUT command; 3213 */ 3214 spin_lock(&pr_tmpl->registration_lock); 3215 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3216 &pr_tmpl->registration_list, pr_reg_list) { 3217 3218 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3219 if (calling_it_nexus) 3220 continue; 3221 3222 if (pr_reg->pr_res_key != sa_res_key) 3223 continue; 3224 3225 pr_reg_nacl = pr_reg->pr_reg_nacl; 3226 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3227 __core_scsi3_free_registration(dev, pr_reg, 3228 (abort) ? &preempt_and_abort_list : NULL, 3229 calling_it_nexus); 3230 /* 3231 * e) Establish a unit attention condition for the initiator 3232 * port associated with every I_T nexus that lost its 3233 * persistent reservation and/or registration, with the 3234 * additional sense code set to REGISTRATIONS PREEMPTED; 3235 */ 3236 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3237 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3238 } 3239 spin_unlock(&pr_tmpl->registration_lock); 3240 /* 3241 * c) Establish a persistent reservation for the preempting 3242 * I_T nexus using the contents of the SCOPE and TYPE fields; 3243 */ 3244 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3245 (abort) ? &preempt_and_abort_list : NULL, 3246 type, scope, abort); 3247 /* 3248 * d) Process tasks as defined in 5.7.1; 3249 * e) See above.. 3250 * f) If the type or scope has changed, then for every I_T nexus 3251 * whose reservation key was not removed, except for the I_T 3252 * nexus on which the PERSISTENT RESERVE OUT command was 3253 * received, the device server shall establish a unit 3254 * attention condition for the initiator port associated with 3255 * that I_T nexus, with the additional sense code set to 3256 * RESERVATIONS RELEASED. If the type or scope have not 3257 * changed, then no unit attention condition(s) shall be 3258 * established for this reason. 3259 */ 3260 if ((prh_type != type) || (prh_scope != scope)) { 3261 spin_lock(&pr_tmpl->registration_lock); 3262 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3263 &pr_tmpl->registration_list, pr_reg_list) { 3264 3265 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3266 if (calling_it_nexus) 3267 continue; 3268 3269 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3270 pr_reg->pr_res_mapped_lun, 0x2A, 3271 ASCQ_2AH_RESERVATIONS_RELEASED); 3272 } 3273 spin_unlock(&pr_tmpl->registration_lock); 3274 } 3275 spin_unlock(&dev->dev_reservation_lock); 3276 /* 3277 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3278 * All received CDBs for the matching existing reservation and 3279 * registrations undergo ABORT_TASK logic. 3280 * 3281 * From there, core_scsi3_release_preempt_and_abort() will 3282 * release every registration in the list (which have already 3283 * been removed from the primary pr_reg list), except the 3284 * new persistent reservation holder, the calling Initiator Port. 3285 */ 3286 if (abort) { 3287 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3288 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3289 pr_reg_n); 3290 } 3291 3292 if (pr_tmpl->pr_aptpl_active) { 3293 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3294 &pr_reg_n->pr_aptpl_buf[0], 3295 pr_tmpl->pr_aptpl_buf_len); 3296 if (!ret) 3297 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3298 "%s\n", (abort) ? "_AND_ABORT" : ""); 3299 } 3300 3301 core_scsi3_put_pr_reg(pr_reg_n); 3302 core_scsi3_pr_generation(cmd->se_dev); 3303 return 0; 3304 } 3305 3306 static int core_scsi3_emulate_pro_preempt( 3307 struct se_cmd *cmd, 3308 int type, 3309 int scope, 3310 u64 res_key, 3311 u64 sa_res_key, 3312 int abort) 3313 { 3314 int ret = 0; 3315 3316 switch (type) { 3317 case PR_TYPE_WRITE_EXCLUSIVE: 3318 case PR_TYPE_EXCLUSIVE_ACCESS: 3319 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3320 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3321 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3322 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3323 ret = core_scsi3_pro_preempt(cmd, type, scope, 3324 res_key, sa_res_key, abort); 3325 break; 3326 default: 3327 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3328 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3329 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3330 return -EINVAL; 3331 } 3332 3333 return ret; 3334 } 3335 3336 3337 static int core_scsi3_emulate_pro_register_and_move( 3338 struct se_cmd *cmd, 3339 u64 res_key, 3340 u64 sa_res_key, 3341 int aptpl, 3342 int unreg) 3343 { 3344 struct se_session *se_sess = cmd->se_sess; 3345 struct se_device *dev = cmd->se_dev; 3346 struct se_dev_entry *se_deve, *dest_se_deve = NULL; 3347 struct se_lun *se_lun = cmd->se_lun; 3348 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3349 struct se_port *se_port; 3350 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3351 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3352 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3353 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3354 unsigned char *buf; 3355 unsigned char *initiator_str; 3356 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3357 u32 tid_len, tmp_tid_len; 3358 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3359 unsigned short rtpi; 3360 unsigned char proto_ident; 3361 3362 if (!se_sess || !se_lun) { 3363 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3364 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3365 return -EINVAL; 3366 } 3367 memset(dest_iport, 0, 64); 3368 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3369 se_tpg = se_sess->se_tpg; 3370 tf_ops = se_tpg->se_tpg_tfo; 3371 se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 3372 /* 3373 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3374 * Register behaviors for a REGISTER AND MOVE service action 3375 * 3376 * Locate the existing *pr_reg via struct se_node_acl pointers 3377 */ 3378 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3379 se_sess); 3380 if (!pr_reg) { 3381 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3382 " *pr_reg for REGISTER_AND_MOVE\n"); 3383 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3384 return -EINVAL; 3385 } 3386 /* 3387 * The provided reservation key much match the existing reservation key 3388 * provided during this initiator's I_T nexus registration. 3389 */ 3390 if (res_key != pr_reg->pr_res_key) { 3391 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3392 " res_key: 0x%016Lx does not match existing SA REGISTER" 3393 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3394 core_scsi3_put_pr_reg(pr_reg); 3395 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3396 return -EINVAL; 3397 } 3398 /* 3399 * The service active reservation key needs to be non zero 3400 */ 3401 if (!sa_res_key) { 3402 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3403 " sa_res_key\n"); 3404 core_scsi3_put_pr_reg(pr_reg); 3405 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3406 return -EINVAL; 3407 } 3408 3409 /* 3410 * Determine the Relative Target Port Identifier where the reservation 3411 * will be moved to for the TransportID containing SCSI initiator WWN 3412 * information. 3413 */ 3414 buf = transport_kmap_data_sg(cmd); 3415 rtpi = (buf[18] & 0xff) << 8; 3416 rtpi |= buf[19] & 0xff; 3417 tid_len = (buf[20] & 0xff) << 24; 3418 tid_len |= (buf[21] & 0xff) << 16; 3419 tid_len |= (buf[22] & 0xff) << 8; 3420 tid_len |= buf[23] & 0xff; 3421 transport_kunmap_data_sg(cmd); 3422 buf = NULL; 3423 3424 if ((tid_len + 24) != cmd->data_length) { 3425 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3426 " does not equal CDB data_length: %u\n", tid_len, 3427 cmd->data_length); 3428 core_scsi3_put_pr_reg(pr_reg); 3429 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3430 return -EINVAL; 3431 } 3432 3433 spin_lock(&dev->se_port_lock); 3434 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3435 if (se_port->sep_rtpi != rtpi) 3436 continue; 3437 dest_se_tpg = se_port->sep_tpg; 3438 if (!dest_se_tpg) 3439 continue; 3440 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3441 if (!dest_tf_ops) 3442 continue; 3443 3444 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3445 smp_mb__after_atomic_inc(); 3446 spin_unlock(&dev->se_port_lock); 3447 3448 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3449 if (ret != 0) { 3450 pr_err("core_scsi3_tpg_depend_item() failed" 3451 " for dest_se_tpg\n"); 3452 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3453 smp_mb__after_atomic_dec(); 3454 core_scsi3_put_pr_reg(pr_reg); 3455 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3456 return -EINVAL; 3457 } 3458 3459 spin_lock(&dev->se_port_lock); 3460 break; 3461 } 3462 spin_unlock(&dev->se_port_lock); 3463 3464 if (!dest_se_tpg || !dest_tf_ops) { 3465 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3466 " fabric ops from Relative Target Port Identifier:" 3467 " %hu\n", rtpi); 3468 core_scsi3_put_pr_reg(pr_reg); 3469 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3470 return -EINVAL; 3471 } 3472 3473 buf = transport_kmap_data_sg(cmd); 3474 proto_ident = (buf[24] & 0x0f); 3475 #if 0 3476 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3477 " 0x%02x\n", proto_ident); 3478 #endif 3479 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3480 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3481 " proto_ident: 0x%02x does not match ident: 0x%02x" 3482 " from fabric: %s\n", proto_ident, 3483 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3484 dest_tf_ops->get_fabric_name()); 3485 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3486 ret = -EINVAL; 3487 goto out; 3488 } 3489 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3490 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3491 " containg a valid tpg_parse_pr_out_transport_id" 3492 " function pointer\n"); 3493 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3494 ret = -EINVAL; 3495 goto out; 3496 } 3497 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3498 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3499 if (!initiator_str) { 3500 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3501 " initiator_str from Transport ID\n"); 3502 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3503 ret = -EINVAL; 3504 goto out; 3505 } 3506 3507 transport_kunmap_data_sg(cmd); 3508 buf = NULL; 3509 3510 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3511 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3512 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3513 iport_ptr : ""); 3514 /* 3515 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3516 * action specifies a TransportID that is the same as the initiator port 3517 * of the I_T nexus for the command received, then the command shall 3518 * be terminated with CHECK CONDITION status, with the sense key set to 3519 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3520 * IN PARAMETER LIST. 3521 */ 3522 pr_reg_nacl = pr_reg->pr_reg_nacl; 3523 matching_iname = (!strcmp(initiator_str, 3524 pr_reg_nacl->initiatorname)) ? 1 : 0; 3525 if (!matching_iname) 3526 goto after_iport_check; 3527 3528 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3529 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3530 " matches: %s on received I_T Nexus\n", initiator_str, 3531 pr_reg_nacl->initiatorname); 3532 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3533 ret = -EINVAL; 3534 goto out; 3535 } 3536 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3537 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3538 " matches: %s %s on received I_T Nexus\n", 3539 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3540 pr_reg->pr_reg_isid); 3541 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3542 ret = -EINVAL; 3543 goto out; 3544 } 3545 after_iport_check: 3546 /* 3547 * Locate the destination struct se_node_acl from the received Transport ID 3548 */ 3549 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3550 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3551 initiator_str); 3552 if (dest_node_acl) { 3553 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3554 smp_mb__after_atomic_inc(); 3555 } 3556 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3557 3558 if (!dest_node_acl) { 3559 pr_err("Unable to locate %s dest_node_acl for" 3560 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3561 initiator_str); 3562 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3563 ret = -EINVAL; 3564 goto out; 3565 } 3566 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3567 if (ret != 0) { 3568 pr_err("core_scsi3_nodeacl_depend_item() for" 3569 " dest_node_acl\n"); 3570 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3571 smp_mb__after_atomic_dec(); 3572 dest_node_acl = NULL; 3573 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3574 ret = -EINVAL; 3575 goto out; 3576 } 3577 #if 0 3578 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3579 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3580 dest_node_acl->initiatorname); 3581 #endif 3582 /* 3583 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3584 * PORT IDENTIFIER. 3585 */ 3586 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3587 if (!dest_se_deve) { 3588 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3589 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3590 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3591 ret = -EINVAL; 3592 goto out; 3593 } 3594 3595 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3596 if (ret < 0) { 3597 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3598 atomic_dec(&dest_se_deve->pr_ref_count); 3599 smp_mb__after_atomic_dec(); 3600 dest_se_deve = NULL; 3601 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3602 ret = -EINVAL; 3603 goto out; 3604 } 3605 #if 0 3606 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3607 " ACL for dest_se_deve->mapped_lun: %u\n", 3608 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3609 dest_se_deve->mapped_lun); 3610 #endif 3611 /* 3612 * A persistent reservation needs to already existing in order to 3613 * successfully complete the REGISTER_AND_MOVE service action.. 3614 */ 3615 spin_lock(&dev->dev_reservation_lock); 3616 pr_res_holder = dev->dev_pr_res_holder; 3617 if (!pr_res_holder) { 3618 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3619 " currently held\n"); 3620 spin_unlock(&dev->dev_reservation_lock); 3621 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3622 ret = -EINVAL; 3623 goto out; 3624 } 3625 /* 3626 * The received on I_T Nexus must be the reservation holder. 3627 * 3628 * From spc4r17 section 5.7.8 Table 50 -- 3629 * Register behaviors for a REGISTER AND MOVE service action 3630 */ 3631 if (pr_res_holder != pr_reg) { 3632 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3633 " Nexus is not reservation holder\n"); 3634 spin_unlock(&dev->dev_reservation_lock); 3635 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3636 ret = -EINVAL; 3637 goto out; 3638 } 3639 /* 3640 * From spc4r17 section 5.7.8: registering and moving reservation 3641 * 3642 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3643 * action is received and the established persistent reservation is a 3644 * Write Exclusive - All Registrants type or Exclusive Access - 3645 * All Registrants type reservation, then the command shall be completed 3646 * with RESERVATION CONFLICT status. 3647 */ 3648 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3649 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3650 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3651 " reservation for type: %s\n", 3652 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3653 spin_unlock(&dev->dev_reservation_lock); 3654 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3655 ret = -EINVAL; 3656 goto out; 3657 } 3658 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3659 /* 3660 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3661 */ 3662 type = pr_res_holder->pr_res_type; 3663 scope = pr_res_holder->pr_res_type; 3664 /* 3665 * c) Associate the reservation key specified in the SERVICE ACTION 3666 * RESERVATION KEY field with the I_T nexus specified as the 3667 * destination of the register and move, where: 3668 * A) The I_T nexus is specified by the TransportID and the 3669 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3670 * B) Regardless of the TransportID format used, the association for 3671 * the initiator port is based on either the initiator port name 3672 * (see 3.1.71) on SCSI transport protocols where port names are 3673 * required or the initiator port identifier (see 3.1.70) on SCSI 3674 * transport protocols where port names are not required; 3675 * d) Register the reservation key specified in the SERVICE ACTION 3676 * RESERVATION KEY field; 3677 * e) Retain the reservation key specified in the SERVICE ACTION 3678 * RESERVATION KEY field and associated information; 3679 * 3680 * Also, It is not an error for a REGISTER AND MOVE service action to 3681 * register an I_T nexus that is already registered with the same 3682 * reservation key or a different reservation key. 3683 */ 3684 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3685 iport_ptr); 3686 if (!dest_pr_reg) { 3687 ret = core_scsi3_alloc_registration(cmd->se_dev, 3688 dest_node_acl, dest_se_deve, iport_ptr, 3689 sa_res_key, 0, aptpl, 2, 1); 3690 if (ret != 0) { 3691 spin_unlock(&dev->dev_reservation_lock); 3692 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3693 ret = -EINVAL; 3694 goto out; 3695 } 3696 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3697 iport_ptr); 3698 new_reg = 1; 3699 } 3700 /* 3701 * f) Release the persistent reservation for the persistent reservation 3702 * holder (i.e., the I_T nexus on which the 3703 */ 3704 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3705 dev->dev_pr_res_holder, 0); 3706 /* 3707 * g) Move the persistent reservation to the specified I_T nexus using 3708 * the same scope and type as the persistent reservation released in 3709 * item f); and 3710 */ 3711 dev->dev_pr_res_holder = dest_pr_reg; 3712 dest_pr_reg->pr_res_holder = 1; 3713 dest_pr_reg->pr_res_type = type; 3714 pr_reg->pr_res_scope = scope; 3715 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3716 PR_REG_ISID_ID_LEN); 3717 /* 3718 * Increment PRGeneration for existing registrations.. 3719 */ 3720 if (!new_reg) 3721 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3722 spin_unlock(&dev->dev_reservation_lock); 3723 3724 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3725 " created new reservation holder TYPE: %s on object RTPI:" 3726 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3727 core_scsi3_pr_dump_type(type), rtpi, 3728 dest_pr_reg->pr_res_generation); 3729 pr_debug("SPC-3 PR Successfully moved reservation from" 3730 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3731 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3732 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3733 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3734 iport_ptr : ""); 3735 /* 3736 * It is now safe to release configfs group dependencies for destination 3737 * of Transport ID Initiator Device/Port Identifier 3738 */ 3739 core_scsi3_lunacl_undepend_item(dest_se_deve); 3740 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3741 core_scsi3_tpg_undepend_item(dest_se_tpg); 3742 /* 3743 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3744 * nexus on which PERSISTENT RESERVE OUT command was received. 3745 */ 3746 if (unreg) { 3747 spin_lock(&pr_tmpl->registration_lock); 3748 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3749 spin_unlock(&pr_tmpl->registration_lock); 3750 } else 3751 core_scsi3_put_pr_reg(pr_reg); 3752 3753 /* 3754 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3755 * write out the updated metadata to struct file for this SCSI device. 3756 */ 3757 if (!aptpl) { 3758 pr_tmpl->pr_aptpl_active = 0; 3759 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3760 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3761 " REGISTER_AND_MOVE\n"); 3762 } else { 3763 pr_tmpl->pr_aptpl_active = 1; 3764 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3765 &dest_pr_reg->pr_aptpl_buf[0], 3766 pr_tmpl->pr_aptpl_buf_len); 3767 if (!ret) 3768 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3769 " REGISTER_AND_MOVE\n"); 3770 } 3771 3772 transport_kunmap_data_sg(cmd); 3773 3774 core_scsi3_put_pr_reg(dest_pr_reg); 3775 return 0; 3776 out: 3777 if (buf) 3778 transport_kunmap_data_sg(cmd); 3779 if (dest_se_deve) 3780 core_scsi3_lunacl_undepend_item(dest_se_deve); 3781 if (dest_node_acl) 3782 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3783 core_scsi3_tpg_undepend_item(dest_se_tpg); 3784 core_scsi3_put_pr_reg(pr_reg); 3785 return ret; 3786 } 3787 3788 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3789 { 3790 unsigned int __v1, __v2; 3791 3792 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3793 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3794 3795 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3796 } 3797 3798 /* 3799 * See spc4r17 section 6.14 Table 170 3800 */ 3801 int target_scsi3_emulate_pr_out(struct se_task *task) 3802 { 3803 struct se_cmd *cmd = task->task_se_cmd; 3804 unsigned char *cdb = &cmd->t_task_cdb[0]; 3805 unsigned char *buf; 3806 u64 res_key, sa_res_key; 3807 int sa, scope, type, aptpl; 3808 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3809 int ret; 3810 3811 /* 3812 * Following spc2r20 5.5.1 Reservations overview: 3813 * 3814 * If a logical unit has been reserved by any RESERVE command and is 3815 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3816 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3817 * initiator or service action and shall terminate with a RESERVATION 3818 * CONFLICT status. 3819 */ 3820 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3821 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3822 " SPC-2 reservation is held, returning" 3823 " RESERVATION_CONFLICT\n"); 3824 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3825 ret = EINVAL; 3826 goto out; 3827 } 3828 3829 /* 3830 * FIXME: A NULL struct se_session pointer means an this is not coming from 3831 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3832 */ 3833 if (!cmd->se_sess) { 3834 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3835 return -EINVAL; 3836 } 3837 3838 if (cmd->data_length < 24) { 3839 pr_warn("SPC-PR: Received PR OUT parameter list" 3840 " length too small: %u\n", cmd->data_length); 3841 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3842 ret = -EINVAL; 3843 goto out; 3844 } 3845 /* 3846 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3847 */ 3848 sa = (cdb[1] & 0x1f); 3849 scope = (cdb[2] & 0xf0); 3850 type = (cdb[2] & 0x0f); 3851 3852 buf = transport_kmap_data_sg(cmd); 3853 /* 3854 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3855 */ 3856 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3857 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3858 /* 3859 * REGISTER_AND_MOVE uses a different SA parameter list containing 3860 * SCSI TransportIDs. 3861 */ 3862 if (sa != PRO_REGISTER_AND_MOVE) { 3863 spec_i_pt = (buf[20] & 0x08); 3864 all_tg_pt = (buf[20] & 0x04); 3865 aptpl = (buf[20] & 0x01); 3866 } else { 3867 aptpl = (buf[17] & 0x01); 3868 unreg = (buf[17] & 0x02); 3869 } 3870 transport_kunmap_data_sg(cmd); 3871 buf = NULL; 3872 3873 /* 3874 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3875 */ 3876 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3877 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3878 ret = -EINVAL; 3879 goto out; 3880 } 3881 3882 /* 3883 * From spc4r17 section 6.14: 3884 * 3885 * If the SPEC_I_PT bit is set to zero, the service action is not 3886 * REGISTER AND MOVE, and the parameter list length is not 24, then 3887 * the command shall be terminated with CHECK CONDITION status, with 3888 * the sense key set to ILLEGAL REQUEST, and the additional sense 3889 * code set to PARAMETER LIST LENGTH ERROR. 3890 */ 3891 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3892 (cmd->data_length != 24)) { 3893 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3894 " list length: %u\n", cmd->data_length); 3895 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3896 ret = -EINVAL; 3897 goto out; 3898 } 3899 /* 3900 * (core_scsi3_emulate_pro_* function parameters 3901 * are defined by spc4r17 Table 174: 3902 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3903 */ 3904 switch (sa) { 3905 case PRO_REGISTER: 3906 ret = core_scsi3_emulate_pro_register(cmd, 3907 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3908 break; 3909 case PRO_RESERVE: 3910 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3911 break; 3912 case PRO_RELEASE: 3913 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3914 break; 3915 case PRO_CLEAR: 3916 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3917 break; 3918 case PRO_PREEMPT: 3919 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3920 res_key, sa_res_key, 0); 3921 break; 3922 case PRO_PREEMPT_AND_ABORT: 3923 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3924 res_key, sa_res_key, 1); 3925 break; 3926 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3927 ret = core_scsi3_emulate_pro_register(cmd, 3928 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3929 break; 3930 case PRO_REGISTER_AND_MOVE: 3931 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3932 sa_res_key, aptpl, unreg); 3933 break; 3934 default: 3935 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3936 " action: 0x%02x\n", cdb[1] & 0x1f); 3937 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3938 ret = -EINVAL; 3939 break; 3940 } 3941 3942 out: 3943 if (!ret) { 3944 task->task_scsi_status = GOOD; 3945 transport_complete_task(task, 1); 3946 } 3947 return ret; 3948 } 3949 3950 /* 3951 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3952 * 3953 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3954 */ 3955 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3956 { 3957 struct se_device *se_dev = cmd->se_dev; 3958 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3959 struct t10_pr_registration *pr_reg; 3960 unsigned char *buf; 3961 u32 add_len = 0, off = 8; 3962 3963 if (cmd->data_length < 8) { 3964 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3965 " too small\n", cmd->data_length); 3966 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3967 return -EINVAL; 3968 } 3969 3970 buf = transport_kmap_data_sg(cmd); 3971 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3972 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3973 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3974 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3975 3976 spin_lock(&su_dev->t10_pr.registration_lock); 3977 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3978 pr_reg_list) { 3979 /* 3980 * Check for overflow of 8byte PRI READ_KEYS payload and 3981 * next reservation key list descriptor. 3982 */ 3983 if ((add_len + 8) > (cmd->data_length - 8)) 3984 break; 3985 3986 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3987 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3988 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3989 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3990 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3991 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3992 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3993 buf[off++] = (pr_reg->pr_res_key & 0xff); 3994 3995 add_len += 8; 3996 } 3997 spin_unlock(&su_dev->t10_pr.registration_lock); 3998 3999 buf[4] = ((add_len >> 24) & 0xff); 4000 buf[5] = ((add_len >> 16) & 0xff); 4001 buf[6] = ((add_len >> 8) & 0xff); 4002 buf[7] = (add_len & 0xff); 4003 4004 transport_kunmap_data_sg(cmd); 4005 4006 return 0; 4007 } 4008 4009 /* 4010 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4011 * 4012 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4013 */ 4014 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4015 { 4016 struct se_device *se_dev = cmd->se_dev; 4017 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4018 struct t10_pr_registration *pr_reg; 4019 unsigned char *buf; 4020 u64 pr_res_key; 4021 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4022 4023 if (cmd->data_length < 8) { 4024 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4025 " too small\n", cmd->data_length); 4026 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4027 return -EINVAL; 4028 } 4029 4030 buf = transport_kmap_data_sg(cmd); 4031 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4032 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4033 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4034 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4035 4036 spin_lock(&se_dev->dev_reservation_lock); 4037 pr_reg = se_dev->dev_pr_res_holder; 4038 if ((pr_reg)) { 4039 /* 4040 * Set the hardcoded Additional Length 4041 */ 4042 buf[4] = ((add_len >> 24) & 0xff); 4043 buf[5] = ((add_len >> 16) & 0xff); 4044 buf[6] = ((add_len >> 8) & 0xff); 4045 buf[7] = (add_len & 0xff); 4046 4047 if (cmd->data_length < 22) 4048 goto err; 4049 4050 /* 4051 * Set the Reservation key. 4052 * 4053 * From spc4r17, section 5.7.10: 4054 * A persistent reservation holder has its reservation key 4055 * returned in the parameter data from a PERSISTENT 4056 * RESERVE IN command with READ RESERVATION service action as 4057 * follows: 4058 * a) For a persistent reservation of the type Write Exclusive 4059 * - All Registrants or Exclusive Access All Regitrants, 4060 * the reservation key shall be set to zero; or 4061 * b) For all other persistent reservation types, the 4062 * reservation key shall be set to the registered 4063 * reservation key for the I_T nexus that holds the 4064 * persistent reservation. 4065 */ 4066 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4067 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4068 pr_res_key = 0; 4069 else 4070 pr_res_key = pr_reg->pr_res_key; 4071 4072 buf[8] = ((pr_res_key >> 56) & 0xff); 4073 buf[9] = ((pr_res_key >> 48) & 0xff); 4074 buf[10] = ((pr_res_key >> 40) & 0xff); 4075 buf[11] = ((pr_res_key >> 32) & 0xff); 4076 buf[12] = ((pr_res_key >> 24) & 0xff); 4077 buf[13] = ((pr_res_key >> 16) & 0xff); 4078 buf[14] = ((pr_res_key >> 8) & 0xff); 4079 buf[15] = (pr_res_key & 0xff); 4080 /* 4081 * Set the SCOPE and TYPE 4082 */ 4083 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4084 (pr_reg->pr_res_type & 0x0f); 4085 } 4086 4087 err: 4088 spin_unlock(&se_dev->dev_reservation_lock); 4089 transport_kunmap_data_sg(cmd); 4090 4091 return 0; 4092 } 4093 4094 /* 4095 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4096 * 4097 * See spc4r17 section 6.13.4 Table 165 4098 */ 4099 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4100 { 4101 struct se_device *dev = cmd->se_dev; 4102 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4103 unsigned char *buf; 4104 u16 add_len = 8; /* Hardcoded to 8. */ 4105 4106 if (cmd->data_length < 6) { 4107 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4108 " %u too small\n", cmd->data_length); 4109 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4110 return -EINVAL; 4111 } 4112 4113 buf = transport_kmap_data_sg(cmd); 4114 4115 buf[0] = ((add_len << 8) & 0xff); 4116 buf[1] = (add_len & 0xff); 4117 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4118 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4119 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4120 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4121 /* 4122 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4123 * set the TMV: Task Mask Valid bit. 4124 */ 4125 buf[3] |= 0x80; 4126 /* 4127 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4128 */ 4129 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4130 /* 4131 * PTPL_A: Persistence across Target Power Loss Active bit 4132 */ 4133 if (pr_tmpl->pr_aptpl_active) 4134 buf[3] |= 0x01; 4135 /* 4136 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4137 */ 4138 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4139 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4140 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4141 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4142 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4143 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4144 4145 transport_kunmap_data_sg(cmd); 4146 4147 return 0; 4148 } 4149 4150 /* 4151 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4152 * 4153 * See spc4r17 section 6.13.5 Table 168 and 169 4154 */ 4155 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4156 { 4157 struct se_device *se_dev = cmd->se_dev; 4158 struct se_node_acl *se_nacl; 4159 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4160 struct se_portal_group *se_tpg; 4161 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4162 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4163 unsigned char *buf; 4164 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4165 u32 off = 8; /* off into first Full Status descriptor */ 4166 int format_code = 0; 4167 4168 if (cmd->data_length < 8) { 4169 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4170 " too small\n", cmd->data_length); 4171 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4172 return -EINVAL; 4173 } 4174 4175 buf = transport_kmap_data_sg(cmd); 4176 4177 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4178 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4179 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4180 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4181 4182 spin_lock(&pr_tmpl->registration_lock); 4183 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4184 &pr_tmpl->registration_list, pr_reg_list) { 4185 4186 se_nacl = pr_reg->pr_reg_nacl; 4187 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4188 add_desc_len = 0; 4189 4190 atomic_inc(&pr_reg->pr_res_holders); 4191 smp_mb__after_atomic_inc(); 4192 spin_unlock(&pr_tmpl->registration_lock); 4193 /* 4194 * Determine expected length of $FABRIC_MOD specific 4195 * TransportID full status descriptor.. 4196 */ 4197 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4198 se_tpg, se_nacl, pr_reg, &format_code); 4199 4200 if ((exp_desc_len + add_len) > cmd->data_length) { 4201 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4202 " out of buffer: %d\n", cmd->data_length); 4203 spin_lock(&pr_tmpl->registration_lock); 4204 atomic_dec(&pr_reg->pr_res_holders); 4205 smp_mb__after_atomic_dec(); 4206 break; 4207 } 4208 /* 4209 * Set RESERVATION KEY 4210 */ 4211 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4212 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4213 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4214 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4215 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4216 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4217 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4218 buf[off++] = (pr_reg->pr_res_key & 0xff); 4219 off += 4; /* Skip Over Reserved area */ 4220 4221 /* 4222 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4223 */ 4224 if (pr_reg->pr_reg_all_tg_pt) 4225 buf[off] = 0x02; 4226 /* 4227 * The struct se_lun pointer will be present for the 4228 * reservation holder for PR_HOLDER bit. 4229 * 4230 * Also, if this registration is the reservation 4231 * holder, fill in SCOPE and TYPE in the next byte. 4232 */ 4233 if (pr_reg->pr_res_holder) { 4234 buf[off++] |= 0x01; 4235 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4236 (pr_reg->pr_res_type & 0x0f); 4237 } else 4238 off += 2; 4239 4240 off += 4; /* Skip over reserved area */ 4241 /* 4242 * From spc4r17 6.3.15: 4243 * 4244 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4245 * IDENTIFIER field contains the relative port identifier (see 4246 * 3.1.120) of the target port that is part of the I_T nexus 4247 * described by this full status descriptor. If the ALL_TG_PT 4248 * bit is set to one, the contents of the RELATIVE TARGET PORT 4249 * IDENTIFIER field are not defined by this standard. 4250 */ 4251 if (!pr_reg->pr_reg_all_tg_pt) { 4252 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4253 4254 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4255 buf[off++] = (port->sep_rtpi & 0xff); 4256 } else 4257 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4258 4259 /* 4260 * Now, have the $FABRIC_MOD fill in the protocol identifier 4261 */ 4262 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4263 se_nacl, pr_reg, &format_code, &buf[off+4]); 4264 4265 spin_lock(&pr_tmpl->registration_lock); 4266 atomic_dec(&pr_reg->pr_res_holders); 4267 smp_mb__after_atomic_dec(); 4268 /* 4269 * Set the ADDITIONAL DESCRIPTOR LENGTH 4270 */ 4271 buf[off++] = ((desc_len >> 24) & 0xff); 4272 buf[off++] = ((desc_len >> 16) & 0xff); 4273 buf[off++] = ((desc_len >> 8) & 0xff); 4274 buf[off++] = (desc_len & 0xff); 4275 /* 4276 * Size of full desctipor header minus TransportID 4277 * containing $FABRIC_MOD specific) initiator device/port 4278 * WWN information. 4279 * 4280 * See spc4r17 Section 6.13.5 Table 169 4281 */ 4282 add_desc_len = (24 + desc_len); 4283 4284 off += desc_len; 4285 add_len += add_desc_len; 4286 } 4287 spin_unlock(&pr_tmpl->registration_lock); 4288 /* 4289 * Set ADDITIONAL_LENGTH 4290 */ 4291 buf[4] = ((add_len >> 24) & 0xff); 4292 buf[5] = ((add_len >> 16) & 0xff); 4293 buf[6] = ((add_len >> 8) & 0xff); 4294 buf[7] = (add_len & 0xff); 4295 4296 transport_kunmap_data_sg(cmd); 4297 4298 return 0; 4299 } 4300 4301 int target_scsi3_emulate_pr_in(struct se_task *task) 4302 { 4303 struct se_cmd *cmd = task->task_se_cmd; 4304 int ret; 4305 4306 /* 4307 * Following spc2r20 5.5.1 Reservations overview: 4308 * 4309 * If a logical unit has been reserved by any RESERVE command and is 4310 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4311 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4312 * initiator or service action and shall terminate with a RESERVATION 4313 * CONFLICT status. 4314 */ 4315 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4316 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4317 " SPC-2 reservation is held, returning" 4318 " RESERVATION_CONFLICT\n"); 4319 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4320 return -EINVAL; 4321 } 4322 4323 switch (cmd->t_task_cdb[1] & 0x1f) { 4324 case PRI_READ_KEYS: 4325 ret = core_scsi3_pri_read_keys(cmd); 4326 break; 4327 case PRI_READ_RESERVATION: 4328 ret = core_scsi3_pri_read_reservation(cmd); 4329 break; 4330 case PRI_REPORT_CAPABILITIES: 4331 ret = core_scsi3_pri_report_capabilities(cmd); 4332 break; 4333 case PRI_READ_FULL_STATUS: 4334 ret = core_scsi3_pri_read_full_status(cmd); 4335 break; 4336 default: 4337 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4338 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4339 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4340 ret = -EINVAL; 4341 break; 4342 } 4343 4344 if (!ret) { 4345 task->task_scsi_status = GOOD; 4346 transport_complete_task(task, 1); 4347 } 4348 return ret; 4349 } 4350 4351 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4352 { 4353 return 0; 4354 } 4355 4356 static int core_pt_seq_non_holder( 4357 struct se_cmd *cmd, 4358 unsigned char *cdb, 4359 u32 pr_reg_type) 4360 { 4361 return 0; 4362 } 4363 4364 int core_setup_reservations(struct se_device *dev, int force_pt) 4365 { 4366 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4367 struct t10_reservation *rest = &su_dev->t10_pr; 4368 /* 4369 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4370 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4371 * cause a problem because libata and some SATA RAID HBAs appear 4372 * under Linux/SCSI, but to emulate reservations themselves. 4373 */ 4374 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4375 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4376 rest->res_type = SPC_PASSTHROUGH; 4377 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4378 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4379 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4380 " emulation\n", dev->transport->name); 4381 return 0; 4382 } 4383 /* 4384 * If SPC-3 or above is reported by real or emulated struct se_device, 4385 * use emulated Persistent Reservations. 4386 */ 4387 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4388 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4389 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4390 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4391 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4392 " emulation\n", dev->transport->name); 4393 } else { 4394 rest->res_type = SPC2_RESERVATIONS; 4395 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4396 rest->pr_ops.t10_seq_non_holder = 4397 &core_scsi2_reservation_seq_non_holder; 4398 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4399 dev->transport->name); 4400 } 4401 4402 return 0; 4403 } 4404